diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..a70a029
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.{py,rs,toml}]
+indent_size = 4
+
+[Makefile]
+indent_style = tab
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..f47922c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+* text=auto eol=lf
+*.png binary
+*.jpg binary
+*.zip binary
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8ad3879
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,35 @@
+# In-progress planning and engineering documents stay local; never publish to Gitea.
+/docs
+
+# Local configuration and credentials
+.env
+.env.*
+!.env.example
+!*.env.example
+*.pem
+*.key
+
+# Tool caches and generated build output
+.cache/
+.tools/
+.venv/
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+node_modules/
+dist/
+target/
+*.egg-info/
+
+# Local data and editor state
+.Trash-*/
+.idea/
+.vscode/
+.DS_Store
+*.log
+deploy/data/
+experiments/results/
+!experiments/results/.gitkeep
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..43ad8a9
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,22 @@
+# KF-OnlineJudge 工程约定
+
+按现有模块边界扩展。本地存在 `docs/ENGINEERING.md` 和 `docs/DEVELOPMENT.md` 时先阅读；开发文档不在远端仓库中。
+
+- 本机 `docs` 使用共享目录链接，Windows 和 CachyOS 使用同一份共享文档；实际目标由 `readlink docs` 确认。不创建另一份同步副本，不把源码、依赖或构建产物写回共享目录。
+- `docs/` 中的开发文档仅保留本地，不加入 Git 提交，不推送到 Gitea；不得用 `git add -f` 绕过忽略规则。
+- 分支采用 `feat/`、`fix/`、`chore/`、`perf/`、`test/` 等工程前缀，提交采用 Conventional Commits；不添加工具名称前缀或工具署名。
+- 本仓库提交身份使用 `kronecker <2026692687@qq.com>`。
+- 后端固定 Python 3.13.16，由 uv 管理；不要改用系统 Python 3.14 或用 uvx 运行项目服务。
+- 在本机原生文件系统中开发，使用仓库根目录 Makefile；Python 环境为 `backend/.venv`，Rust 构建产物为 `judge/target`。
+- 平台为模块化单体；业务域之间通过 `public.py` 调用，不直接操作其他模块的 ORM/repository。
+- Runtime 通过注入端口调用业务工具；不导入业务模块或具体基础设施实现。
+- Rust crate 依赖方向与 Python 分层由 `scripts/check_architecture.py` 检查。新增边界须同步更新架构说明与检查规则。
+- 跨服务协议变更先更新模型和共享样例，运行 `make contracts`，保留 Python/Rust 的兼容验证。
+- 数据库迁移只由后端 Alembic 管理；协调器控制执行状态，判题 Worker 不直接写评测数据库。
+- 沙箱未验证隔离前拒绝执行；不得用直接运行宿主命令作为临时判题实现。
+- 只建立当期需要的接口和实现；未实现能力明确报告，不提供模拟成绩或虚假任务成功状态。
+- 使用项目锁文件；新增依赖说明职责。凭据、私有代码和隐藏测试数据不进入仓库。
+
+按变更运行 `make check-backend`、`make check-judge`、`make check-frontend` 和 `make architecture`。
+跨工程骨架或契约改动运行完整 `make check`，记录实际通过项和未验证的能力。
+沙箱的权限、隔离、超限和破坏性测试单独在规定执行环境验证。
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..83679b0
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,83 @@
+SHELL := /bin/bash
+CARGO ?= $(if $(wildcard $(HOME)/.cargo/bin/cargo),$(HOME)/.cargo/bin/cargo,cargo)
+UV ?= uv
+PNPM ?= pnpm
+
+.PHONY: help install check architecture check-backend check-frontend check-judge contracts format api frontend coordinator sandbox-probe worker-check infra-config infra-up infra-down
+
+help:
+	@echo 'install          安装锁定依赖并编译 Rust workspace'
+	@echo 'check            架构、契约、静态检查、测试与前端构建'
+	@echo 'contracts        更新 JSON Schema、OpenAPI 与前端类型'
+	@echo 'format           格式化 Python、Rust 与前端源码'
+	@echo 'api / frontend   启动平台 API / 前端开发服务'
+	@echo 'coordinator      启动协调器 HTTP 骨架'
+	@echo 'sandbox-probe    只读探测当前 Linux 环境'
+	@echo 'worker-check     验证三个后台进程入口，不消费任务'
+	@echo 'infra-config     检查本地 PostgreSQL / RabbitMQ 配置'
+	@echo 'infra-up/down    启动/停止本地开发依赖（保留数据卷）'
+
+install:
+	cd backend && $(UV) sync --locked
+	cd frontend && $(PNPM) install --frozen-lockfile
+	cd judge && $(CARGO) build --workspace --locked
+
+check: architecture check-backend check-judge check-frontend infra-config
+
+architecture:
+	python3 scripts/check_architecture.py
+
+check-backend:
+	cd backend && $(UV) run --locked ruff check . ../scripts
+	cd backend && $(UV) run --locked ruff format --check . ../scripts
+	cd backend && $(UV) run --locked pytest
+	cd backend && $(UV) run --locked python -m kf_oj.contracts.export --check
+
+check-judge:
+	cd judge && $(CARGO) fmt --all -- --check
+	cd judge && $(CARGO) clippy --workspace --all-targets --locked -- -D warnings
+	cd judge && $(CARGO) test --workspace --locked
+
+check-frontend:
+	cd frontend && $(PNPM) check:api
+	cd frontend && $(PNPM) lint
+	cd frontend && $(PNPM) format:check
+	cd frontend && $(PNPM) typecheck
+	cd frontend && $(PNPM) test
+	cd frontend && $(PNPM) build
+
+contracts:
+	cd backend && $(UV) run --locked python -m kf_oj.contracts.export
+	cd frontend && $(PNPM) generate:api
+
+format:
+	cd backend && $(UV) run --locked ruff check --fix . ../scripts
+	cd backend && $(UV) run --locked ruff format . ../scripts
+	cd judge && $(CARGO) fmt --all
+	cd frontend && $(PNPM) format
+
+api:
+	cd backend && $(UV) run --locked uvicorn kf_oj.api.app:create_app --factory --reload --host 127.0.0.1 --port 8000
+
+frontend:
+	cd frontend && $(PNPM) dev
+
+coordinator:
+	cd judge && $(CARGO) run --locked -p kf-coordinator
+
+sandbox-probe:
+	cd judge && $(CARGO) run --locked -p kf-sandbox -- probe
+
+worker-check:
+	cd backend && $(UV) run --locked kf-learning-worker --check
+	cd backend && $(UV) run --locked kf-outbox-publisher --check
+	cd judge && $(CARGO) run --locked -p kf-worker -- --check
+
+infra-config:
+	docker compose --env-file deploy/.env.example -f deploy/compose.dev.yml config --quiet
+
+infra-up:
+	docker compose --env-file deploy/.env -f deploy/compose.dev.yml up -d --wait
+
+infra-down:
+	docker compose --env-file deploy/.env -f deploy/compose.dev.yml down
diff --git a/README.md b/README.md
index 661bdde..6d0019a 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,73 @@
 # KF-OnlineJudge
 
+以 Rust 自研判题与 Linux 沙箱、以 Python/FastAPI 提供平台服务的在线评测系统。
+前端使用 Vue 3、TypeScript、Element Plus 和 Vite。
+
+当前版本为 **0.0.1 工程骨架**：平台 API 和协调器提供存活接口，前端可检查实际 API 连接。
+沙箱隔离执行、判题、账号、题库、提交与学习业务尚未实现。
+
+## 工程划分
+
+| 目录 | 职责 |
+| --- | --- |
+| `backend/` | Python 模块化单体、平台 API、学习 Worker、待投递事件发布器及唯一数据库迁移入口 |
+| `judge/` | Rust workspace：协议、沙箱、判题编排、判题 Worker 和协调器 |
+| `frontend/` | 页面、路由、请求生命周期与生成的 API 类型 |
+| `contracts/` | 版本化 JSON Schema 与 OpenAPI 快照 |
+| `deploy/` | 本地 PostgreSQL / RabbitMQ 配置 |
+| `scripts/` | Python 导入边界与 Rust crate 依赖检查 |
+| `tests/` | 跨语言共享协议样例 |
+| `skills/`、`experiments/` | 后续内置技能与可复现实验的扩展位置 |
+
+Python 业务域分为 `identity`、`problems`、`submissions`、`community`、`learning`、`skills`
+和 `operations`。业务域之间通过公开应用接口协作，不直接访问其他域的持久化实现。
+`runtime` 管理执行机制，通过注入端口调用业务能力。
+
+Rust 分为 `kf-contracts`、`kf-sandbox`、`kf-engine`、`kf-worker`、`kf-coordinator` 五个 crate。
+协调器拥有执行状态写入权，判题 Worker 不直接写评测数据库。
+沙箱尚未验证隔离能力，当前执行入口明确拒绝运行程序。
+
+## 安装与检查
+
+工具链基线：Python 3.13.16 + uv、Rust 1.99.0、Node 26.10.0 + pnpm 11.28.4。
+Python 和 Rust 版本由工程配置固定，三套工程分别提交依赖锁文件。
+开发与构建使用 Linux 原生文件系统。
+
+```bash
+make install
+make check
+```
+
+`make check` 包含架构边界、契约同步、静态检查、测试、前端生产构建和 Compose 配置检查。
+检查无需启动数据库或队列，也不执行破坏性沙箱测试。
+`make format` 格式化源码，`make contracts` 更新 Schema、OpenAPI 和前端类型。
+
+## 启动骨架
+
+分别在终端运行：
+
+```bash
+make api          # 平台 API：127.0.0.1:8000
+make frontend     # Vue 开发服务：127.0.0.1:5173
+make coordinator  # 协调器：127.0.0.1:8100
+```
+
+平台存活接口为 `/api/v1/health/live`，开发 API 文档为 `/api/docs`。
+前端开发服务将 `/api` 代理到平台；生产部署需另行配置反向代理与 SPA 路由回退。
+协调器存活接口为 `/health/live`。
+
+```bash
+make worker-check   # 三个后台入口仅检查配置，不消费任务
+make sandbox-probe  # 只读观察 Linux 环境，不创建隔离资源
+```
+
+本地数据库与队列的启动步骤见 [部署说明](deploy/README.md)。
+业务表和数据库 revision 尚未建立；迁移统一由后端 Alembic 管理。
+模型服务与第三方插件尚未接入。
+
+开发中的规划文档仅在本地维护，不包含在远端仓库中。
+后续逐步实现沙箱、单机判题、分布式恢复、并行优化和学习功能。
+
+## 许可证
+
+[MIT](LICENSE)。引用或复用其他项目代码时记录来源并遵守对应许可证。
diff --git a/backend/.env.example b/backend/.env.example
new file mode 100644
index 0000000..faad37a
--- /dev/null
+++ b/backend/.env.example
@@ -0,0 +1,5 @@
+KF_OJ_ENVIRONMENT=development
+KF_OJ_LOG_LEVEL=INFO
+# Optional until database-backed use cases are implemented.
+KF_OJ_DATABASE_URL=postgresql+asyncpg://kf_oj:local-dev-only@127.0.0.1:5432/kf_oj
+KF_OJ_AMQP_URL=amqp://kf_oj:local-dev-only@127.0.0.1:5672/kf_oj
diff --git a/backend/.python-version b/backend/.python-version
new file mode 100644
index 0000000..d540408
--- /dev/null
+++ b/backend/.python-version
@@ -0,0 +1 @@
+3.13.16
diff --git a/backend/README.md b/backend/README.md
new file mode 100644
index 0000000..27d4b56
--- /dev/null
+++ b/backend/README.md
@@ -0,0 +1,25 @@
+# Python 平台工程
+
+固定 Python 3.13.16，使用 uv 管理项目与锁文件。API、待投递事件发布器和学习 Worker
+共用一个 Python 包、一个依赖锁文件，分别运行独立进程。
+
+业务模块位于 `src/kf_oj/modules/`；HTTP 在 `api/`；通用适配器在 `infra/`；
+Agent 执行机制在 `runtime/`；进程组合入口在 `workers/`。
+业务域之间通过公开应用接口调用，不直接访问其他域的 repository/models。
+Runtime 通过注入端口调用业务能力；导入边界由根目录的架构检查脚本验证。
+
+```bash
+# 从仓库根目录调用。
+make install
+make api
+make worker-check
+```
+
+API 当前只有 `/api/v1/health/live`，不连接数据库或消息队列。
+Worker 目前仅支持 `--check`，默认拒绝进入尚未实现的任务循环。
+日志、配置和迁移入口已建立；业务表、登录、判题投递和模型接入尚未实现。
+
+Python 虚拟环境位于 `backend/.venv`，可在 `backend/` 直接使用 `uv sync --locked` 和 `uv run --locked`。
+数据库由 Alembic 唯一管理；业务模型落地后在 `migrations/env.py` 中显式登记元数据。
+不要用 API 启动时的 `create_all` 代替迁移，也不要让 Rust 维护另一套迁移历史。
+配置示例在 `.env.example`；执行迁移前复制为 `.env` 并设置实际数据库连接。
diff --git a/backend/alembic.ini b/backend/alembic.ini
new file mode 100644
index 0000000..e7c98f8
--- /dev/null
+++ b/backend/alembic.ini
@@ -0,0 +1,37 @@
+[alembic]
+script_location = %(here)s/migrations
+prepend_sys_path = .
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/backend/migrations/env.py b/backend/migrations/env.py
new file mode 100644
index 0000000..c105c05
--- /dev/null
+++ b/backend/migrations/env.py
@@ -0,0 +1,52 @@
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import Connection
+
+from kf_oj.core.settings import Settings
+from kf_oj.infra.db.base import Base
+from kf_oj.infra.db.session import build_engine
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Register each business module's ORM models here when its schema is implemented.
+target_metadata = Base.metadata
+
+
+def run_offline() -> None:
+    settings = Settings()
+    if settings.database_url is None:
+        raise ValueError("KF_OJ_DATABASE_URL is required for migrations")
+    context.configure(
+        url=settings.database_url.get_secret_value(),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def migrate(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata, compare_type=True)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_online() -> None:
+    engine = build_engine(Settings())
+    try:
+        async with engine.connect() as connection:
+            await connection.run_sync(migrate)
+    finally:
+        await engine.dispose()
+
+
+if context.is_offline_mode():
+    run_offline()
+else:
+    asyncio.run(run_online())
diff --git a/backend/migrations/script.py.mako b/backend/migrations/script.py.mako
new file mode 100644
index 0000000..49a7df2
--- /dev/null
+++ b/backend/migrations/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+"""
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+revision: str = ${repr(up_revision)}
+down_revision: str | None = ${repr(down_revision)}
+branch_labels: str | Sequence[str] | None = ${repr(branch_labels)}
+depends_on: str | Sequence[str] | None = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
diff --git a/backend/migrations/versions/.gitkeep b/backend/migrations/versions/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
new file mode 100644
index 0000000..949761d
--- /dev/null
+++ b/backend/pyproject.toml
@@ -0,0 +1,46 @@
+[build-system]
+requires = ["hatchling>=1.27,<2"]
+build-backend = "hatchling.build"
+
+[project]
+name = "kf-oj-platform"
+version = "0.0.1"
+description = "KF-OnlineJudge platform and learning workers"
+readme = "README.md"
+requires-python = ">=3.13,<3.14"
+dependencies = [
+    "fastapi>=0.115,<1",
+    "pydantic>=2.10,<3",
+    "pydantic-settings>=2.7,<3",
+    "uvicorn>=0.34,<1",
+    "sqlalchemy[asyncio]>=2.0,<3",
+    "asyncpg>=0.30,<1",
+    "alembic>=1.15,<2",
+    "aio-pika>=9.5,<10",
+]
+
+[project.scripts]
+kf-learning-worker = "kf_oj.workers.learning:main"
+kf-outbox-publisher = "kf_oj.workers.outbox:main"
+
+[dependency-groups]
+dev = [
+    "ruff>=0.11,<1",
+    "pytest>=8.3,<10",
+    "httpx>=0.28,<1",
+    "jsonschema>=4.23,<5",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/kf_oj"]
+
+[tool.ruff]
+target-version = "py313"
+line-length = 100
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "B", "UP"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-ra"
diff --git a/backend/src/kf_oj/__init__.py b/backend/src/kf_oj/__init__.py
new file mode 100644
index 0000000..fb3a09f
--- /dev/null
+++ b/backend/src/kf_oj/__init__.py
@@ -0,0 +1,3 @@
+"""KF-OnlineJudge platform, application modules and learning workers."""
+
+__version__ = "0.0.1"
diff --git a/backend/src/kf_oj/api/__init__.py b/backend/src/kf_oj/api/__init__.py
new file mode 100644
index 0000000..b6f9df6
--- /dev/null
+++ b/backend/src/kf_oj/api/__init__.py
@@ -0,0 +1 @@
+"""HTTP transport and application composition."""
diff --git a/backend/src/kf_oj/api/app.py b/backend/src/kf_oj/api/app.py
new file mode 100644
index 0000000..0d6d81c
--- /dev/null
+++ b/backend/src/kf_oj/api/app.py
@@ -0,0 +1,36 @@
+import logging
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from kf_oj import __version__
+from kf_oj.api.v1.router import router
+from kf_oj.core.logging import configure_logging
+from kf_oj.core.settings import Settings
+
+
+def create_app(settings: Settings | None = None) -> FastAPI:
+    settings = settings or Settings()
+
+    @asynccontextmanager
+    async def lifespan(_: FastAPI):
+        configure_logging(settings.log_level)
+        logger = logging.getLogger("kf_oj.api")
+        logger.info("Platform API started")
+        try:
+            yield
+        finally:
+            logger.info("Platform API stopped")
+
+    app = FastAPI(
+        title="KF-OnlineJudge Platform API",
+        version=__version__,
+        description="工程骨架。当前只提供进程存活检查，业务接口逐项实现。",
+        docs_url="/api/docs" if settings.environment != "production" else None,
+        redoc_url=None,
+        openapi_url="/api/openapi.json" if settings.environment != "production" else None,
+        lifespan=lifespan,
+    )
+    app.state.settings = settings
+    app.include_router(router, prefix="/api/v1")
+    return app
diff --git a/backend/src/kf_oj/api/v1/__init__.py b/backend/src/kf_oj/api/v1/__init__.py
new file mode 100644
index 0000000..27a6722
--- /dev/null
+++ b/backend/src/kf_oj/api/v1/__init__.py
@@ -0,0 +1 @@
+"""Platform API version 1."""
diff --git a/backend/src/kf_oj/api/v1/router.py b/backend/src/kf_oj/api/v1/router.py
new file mode 100644
index 0000000..8407ad9
--- /dev/null
+++ b/backend/src/kf_oj/api/v1/router.py
@@ -0,0 +1,12 @@
+from fastapi import APIRouter
+
+from kf_oj import __version__
+from kf_oj.contracts.health import HealthResponse
+
+router = APIRouter()
+
+
+@router.get("/health/live", response_model=HealthResponse, tags=["health"], operation_id="liveness")
+async def liveness() -> HealthResponse:
+    """Check process liveness only; does not attest DB, queue or judge readiness."""
+    return HealthResponse(status="ok", service="platform", version=__version__)
diff --git a/backend/src/kf_oj/contracts/__init__.py b/backend/src/kf_oj/contracts/__init__.py
new file mode 100644
index 0000000..2a9d45c
--- /dev/null
+++ b/backend/src/kf_oj/contracts/__init__.py
@@ -0,0 +1 @@
+"""Versioned transport models; never import business or infrastructure code."""
diff --git a/backend/src/kf_oj/contracts/export.py b/backend/src/kf_oj/contracts/export.py
new file mode 100644
index 0000000..6102016
--- /dev/null
+++ b/backend/src/kf_oj/contracts/export.py
@@ -0,0 +1,41 @@
+"""Export deterministic public contracts without opening DB or queue connections."""
+
+import argparse
+import json
+from pathlib import Path
+
+from kf_oj.api.app import create_app
+from kf_oj.contracts.judge import JudgeTaskNotification
+from kf_oj.core.settings import Settings
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--check", action="store_true", help="Fail if checked-in files are stale")
+    args = parser.parse_args()
+    root = Path(__file__).resolve().parents[4]
+    schema = JudgeTaskNotification.model_json_schema()
+    schema["$schema"] = "https://json-schema.org/draft/2020-12/schema"
+    schema["$id"] = "urn:kf-oj:judge-task:v1"
+    outputs = {
+        root / "contracts/schemas/judge-task.v1.schema.json": schema,
+        root / "contracts/openapi/platform.v1.json": create_app(
+            Settings(_env_file=None, environment="test")
+        ).openapi(),
+    }
+    stale = []
+    for path, document in outputs.items():
+        content = json.dumps(document, indent=2, sort_keys=True, ensure_ascii=False) + "\n"
+        if args.check:
+            if not path.exists() or path.read_text(encoding="utf-8") != content:
+                stale.append(str(path.relative_to(root)))
+        else:
+            path.parent.mkdir(parents=True, exist_ok=True)
+            path.write_text(content, encoding="utf-8")
+            print(f"Exported {path.relative_to(root)}")
+    if stale:
+        parser.exit(1, "Stale contracts: " + ", ".join(stale) + "; run make contracts\n")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/backend/src/kf_oj/contracts/health.py b/backend/src/kf_oj/contracts/health.py
new file mode 100644
index 0000000..2077005
--- /dev/null
+++ b/backend/src/kf_oj/contracts/health.py
@@ -0,0 +1,11 @@
+from typing import Literal
+
+from pydantic import BaseModel, ConfigDict
+
+
+class HealthResponse(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    status: Literal["ok"]
+    service: Literal["platform"]
+    version: str
diff --git a/backend/src/kf_oj/contracts/judge.py b/backend/src/kf_oj/contracts/judge.py
new file mode 100644
index 0000000..07b1149
--- /dev/null
+++ b/backend/src/kf_oj/contracts/judge.py
@@ -0,0 +1,14 @@
+from typing import Literal
+from uuid import UUID
+
+from pydantic import BaseModel, ConfigDict
+
+
+class JudgeTaskNotification(BaseModel):
+    """A wake-up notification, not execution authority or the source of task state."""
+
+    model_config = ConfigDict(extra="forbid", frozen=True)
+
+    schema_version: Literal[1]
+    kind: Literal["judge.evaluation"]
+    evaluation_id: UUID
diff --git a/backend/src/kf_oj/core/__init__.py b/backend/src/kf_oj/core/__init__.py
new file mode 100644
index 0000000..1801d85
--- /dev/null
+++ b/backend/src/kf_oj/core/__init__.py
@@ -0,0 +1 @@
+"""Cross-cutting configuration and logging; no business or transport dependencies."""
diff --git a/backend/src/kf_oj/core/logging.py b/backend/src/kf_oj/core/logging.py
new file mode 100644
index 0000000..ae5f0e1
--- /dev/null
+++ b/backend/src/kf_oj/core/logging.py
@@ -0,0 +1,22 @@
+import json
+import logging
+from datetime import UTC, datetime
+
+
+class JsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload = {
+            "timestamp": datetime.fromtimestamp(record.created, UTC).isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        if record.exc_info:
+            payload["exception"] = self.formatException(record.exc_info)
+        return json.dumps(payload, ensure_ascii=False)
+
+
+def configure_logging(level: str) -> None:
+    handler = logging.StreamHandler()
+    handler.setFormatter(JsonFormatter())
+    logging.basicConfig(level=level, handlers=[handler], force=True)
diff --git a/backend/src/kf_oj/core/settings.py b/backend/src/kf_oj/core/settings.py
new file mode 100644
index 0000000..f5fb278
--- /dev/null
+++ b/backend/src/kf_oj/core/settings.py
@@ -0,0 +1,13 @@
+from typing import Literal
+
+from pydantic import SecretStr
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_prefix="KF_OJ_", env_file=".env", extra="ignore")
+
+    environment: Literal["development", "test", "production"] = "development"
+    log_level: Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"] = "INFO"
+    database_url: SecretStr | None = None
+    amqp_url: SecretStr | None = None
diff --git a/backend/src/kf_oj/infra/__init__.py b/backend/src/kf_oj/infra/__init__.py
new file mode 100644
index 0000000..fb6c8be
--- /dev/null
+++ b/backend/src/kf_oj/infra/__init__.py
@@ -0,0 +1 @@
+"""Shared database, messaging and artifact adapters; no HTTP or business orchestration."""
diff --git a/backend/src/kf_oj/infra/artifacts/__init__.py b/backend/src/kf_oj/infra/artifacts/__init__.py
new file mode 100644
index 0000000..38d4a81
--- /dev/null
+++ b/backend/src/kf_oj/infra/artifacts/__init__.py
@@ -0,0 +1 @@
+"""Reserved for authenticated artifact access and digest verification."""
diff --git a/backend/src/kf_oj/infra/db/__init__.py b/backend/src/kf_oj/infra/db/__init__.py
new file mode 100644
index 0000000..f36de67
--- /dev/null
+++ b/backend/src/kf_oj/infra/db/__init__.py
@@ -0,0 +1 @@
+"""Database primitives; all schema migrations live in backend/migrations."""
diff --git a/backend/src/kf_oj/infra/db/base.py b/backend/src/kf_oj/infra/db/base.py
new file mode 100644
index 0000000..932a4b8
--- /dev/null
+++ b/backend/src/kf_oj/infra/db/base.py
@@ -0,0 +1,14 @@
+from sqlalchemy import MetaData
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    metadata = MetaData(
+        naming_convention={
+            "ix": "ix_%(table_name)s_%(column_0_name)s",
+            "uq": "uq_%(table_name)s_%(column_0_name)s",
+            "ck": "ck_%(table_name)s_%(constraint_name)s",
+            "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
+            "pk": "pk_%(table_name)s",
+        }
+    )
diff --git a/backend/src/kf_oj/infra/db/session.py b/backend/src/kf_oj/infra/db/session.py
new file mode 100644
index 0000000..02806dd
--- /dev/null
+++ b/backend/src/kf_oj/infra/db/session.py
@@ -0,0 +1,13 @@
+from sqlalchemy.ext.asyncio import AsyncEngine, async_sessionmaker, create_async_engine
+
+from kf_oj.core.settings import Settings
+
+
+def build_engine(settings: Settings) -> AsyncEngine:
+    if settings.database_url is None:
+        raise ValueError("KF_OJ_DATABASE_URL is required for database-backed operations")
+    return create_async_engine(settings.database_url.get_secret_value(), pool_pre_ping=True)
+
+
+def build_session_factory(engine: AsyncEngine) -> async_sessionmaker:
+    return async_sessionmaker(engine, expire_on_commit=False)
diff --git a/backend/src/kf_oj/infra/messaging/__init__.py b/backend/src/kf_oj/infra/messaging/__init__.py
new file mode 100644
index 0000000..a7f11f0
--- /dev/null
+++ b/backend/src/kf_oj/infra/messaging/__init__.py
@@ -0,0 +1 @@
+"""Reserved for AMQP publishing/consuming adapters, confirms and retry transport."""
diff --git a/backend/src/kf_oj/modules/__init__.py b/backend/src/kf_oj/modules/__init__.py
new file mode 100644
index 0000000..204b989
--- /dev/null
+++ b/backend/src/kf_oj/modules/__init__.py
@@ -0,0 +1 @@
+"""Business modules; cross-module calls go through explicit public application interfaces."""
diff --git a/backend/src/kf_oj/modules/community/README.md b/backend/src/kf_oj/modules/community/README.md
new file mode 100644
index 0000000..374c288
--- /dev/null
+++ b/backend/src/kf_oj/modules/community/README.md
@@ -0,0 +1,6 @@
+# community
+
+负责题目讨论、题解、评论、作者归属、可见性及内容修改记录。
+题目和账号信息通过对应模块的公开接口查询，不直接操作其 ORM 表。
+技能社区的技能版本与发布语义归 `skills` 管理，本模块只提供可复用的内容/反馈能力。
+当前未实现社区接口。
diff --git a/backend/src/kf_oj/modules/community/__init__.py b/backend/src/kf_oj/modules/community/__init__.py
new file mode 100644
index 0000000..f2b7616
--- /dev/null
+++ b/backend/src/kf_oj/modules/community/__init__.py
@@ -0,0 +1 @@
+"""Problem discussions, solutions, comments and content visibility (PF-04)."""
diff --git a/backend/src/kf_oj/modules/identity/README.md b/backend/src/kf_oj/modules/identity/README.md
new file mode 100644
index 0000000..299e021
--- /dev/null
+++ b/backend/src/kf_oj/modules/identity/README.md
@@ -0,0 +1,5 @@
+# identity
+
+负责账号、登录凭证、会话与角色；向其他模块提供经过验证的用户身份和授权依据。
+后续 `public.py` 暴露身份查询接口，`service.py` 编排用例，`repository.py` 封装持久化。
+用户身份不能来自前端自报字段或模型参数。目前仅建立模块边界，未实现登录。
diff --git a/backend/src/kf_oj/modules/identity/__init__.py b/backend/src/kf_oj/modules/identity/__init__.py
new file mode 100644
index 0000000..03de82b
--- /dev/null
+++ b/backend/src/kf_oj/modules/identity/__init__.py
@@ -0,0 +1 @@
+"""Accounts, credentials, roles and trusted user identity (PF-02)."""
diff --git a/backend/src/kf_oj/modules/learning/README.md b/backend/src/kf_oj/modules/learning/README.md
new file mode 100644
index 0000000..43d3f90
--- /dev/null
+++ b/backend/src/kf_oj/modules/learning/README.md
@@ -0,0 +1,7 @@
+# learning
+
+负责学习证据、统计与代码差异、题库筛选、分层答疑、计划校验和反馈。
+读取其他业务域的授权公开接口，通过组合层向 `runtime` 注入受控业务工具。
+规则推荐属于业务模块；步骤执行、预算与检查点属于 `runtime`。
+基础设施重试不能算成学生失败；模型输出必须校验后才能保存业务结果。
+当前未接入模型，也未创建训练计划表。
diff --git a/backend/src/kf_oj/modules/learning/__init__.py b/backend/src/kf_oj/modules/learning/__init__.py
new file mode 100644
index 0000000..a270d0f
--- /dev/null
+++ b/backend/src/kf_oj/modules/learning/__init__.py
@@ -0,0 +1 @@
+"""Evidence, recommendations, tutoring, training plans and feedback (AI-01..05)."""
diff --git a/backend/src/kf_oj/modules/operations/README.md b/backend/src/kf_oj/modules/operations/README.md
new file mode 100644
index 0000000..9681a78
--- /dev/null
+++ b/backend/src/kf_oj/modules/operations/README.md
@@ -0,0 +1,5 @@
+# operations
+
+负责平台侧节点、任务积压、重试原因和审计查询的管理视图。
+对判题状态的操作必须调用协调器协议；观测模块不成为第二个状态写入入口。
+当前只有目录边界，节点登记、指标聚合和管理员接口待实现。
diff --git a/backend/src/kf_oj/modules/operations/__init__.py b/backend/src/kf_oj/modules/operations/__init__.py
new file mode 100644
index 0000000..e096dbd
--- /dev/null
+++ b/backend/src/kf_oj/modules/operations/__init__.py
@@ -0,0 +1 @@
+"""Read-only node/task observability and administrator views (PF-05)."""
diff --git a/backend/src/kf_oj/modules/problems/README.md b/backend/src/kf_oj/modules/problems/README.md
new file mode 100644
index 0000000..9b62478
--- /dev/null
+++ b/backend/src/kf_oj/modules/problems/README.md
@@ -0,0 +1,5 @@
+# problems
+
+负责题目逻辑身份、不可变版本、导入、标签、限制、发布状态与测试工件元数据。
+跨模块访问通过后续 `public.py`；大文件存取通过 `infra/artifacts` 的适配器。
+隐藏数据与公开样例分别授权。当前未创建题库表或导入接口。
diff --git a/backend/src/kf_oj/modules/problems/__init__.py b/backend/src/kf_oj/modules/problems/__init__.py
new file mode 100644
index 0000000..0fc7c32
--- /dev/null
+++ b/backend/src/kf_oj/modules/problems/__init__.py
@@ -0,0 +1 @@
+"""Problem catalog, immutable versions, import and publication (PF-02)."""
diff --git a/backend/src/kf_oj/modules/skills/README.md b/backend/src/kf_oj/modules/skills/README.md
new file mode 100644
index 0000000..a398830
--- /dev/null
+++ b/backend/src/kf_oj/modules/skills/README.md
@@ -0,0 +1,7 @@
+# skills
+
+负责声明式技能包、不可变版本、个人绑定和参数、启停及后续分享生命周期。
+包内容与用户私有学习档案分开存储；工具声明不能增加后端授权。
+`runtime` 只接收已经校验的固定版本和参数，不导入本模块实现。
+仓库根目录 `skills/` 保存未来平台维护的静态内置内容；用户绑定属于数据库业务记录。
+当前未建立包解析器，不执行任何插件脚本。
diff --git a/backend/src/kf_oj/modules/skills/__init__.py b/backend/src/kf_oj/modules/skills/__init__.py
new file mode 100644
index 0000000..044794b
--- /dev/null
+++ b/backend/src/kf_oj/modules/skills/__init__.py
@@ -0,0 +1 @@
+"""Skill definitions, immutable versions, user bindings and publication (SP-01..04)."""
diff --git a/backend/src/kf_oj/modules/submissions/README.md b/backend/src/kf_oj/modules/submissions/README.md
new file mode 100644
index 0000000..28d657c
--- /dev/null
+++ b/backend/src/kf_oj/modules/submissions/README.md
@@ -0,0 +1,6 @@
+# submissions
+
+负责提交幂等请求、不可变源码引用、创建初始评测、历史查询与学生可见结果。
+创建提交、评测和待投递事件必须处于同一事务。
+协调器拥有领取后的执行状态与最终结果写入权；本模块不能绕过协议覆盖终态。
+后续 `public.py` 提供授权后的学习证据入口。当前未实现提交接口。
diff --git a/backend/src/kf_oj/modules/submissions/__init__.py b/backend/src/kf_oj/modules/submissions/__init__.py
new file mode 100644
index 0000000..9672f09
--- /dev/null
+++ b/backend/src/kf_oj/modules/submissions/__init__.py
@@ -0,0 +1 @@
+"""Source snapshots, submission creation, evaluation references and queries (PF-03)."""
diff --git a/backend/src/kf_oj/runtime/__init__.py b/backend/src/kf_oj/runtime/__init__.py
new file mode 100644
index 0000000..293509b
--- /dev/null
+++ b/backend/src/kf_oj/runtime/__init__.py
@@ -0,0 +1,5 @@
+"""Reserved for bounded Agent execution, tool ports, budgets and checkpoints.
+
+Application tools are injected by the learning composition layer. This package
+does not import business modules, database adapters or any model SDK.
+"""
diff --git a/backend/src/kf_oj/workers/__init__.py b/backend/src/kf_oj/workers/__init__.py
new file mode 100644
index 0000000..26f6223
--- /dev/null
+++ b/backend/src/kf_oj/workers/__init__.py
@@ -0,0 +1 @@
+"""Independent process composition roots; task loops are implemented per milestone."""
diff --git a/backend/src/kf_oj/workers/bootstrap.py b/backend/src/kf_oj/workers/bootstrap.py
new file mode 100644
index 0000000..c9e9480
--- /dev/null
+++ b/backend/src/kf_oj/workers/bootstrap.py
@@ -0,0 +1,25 @@
+import argparse
+import json
+
+from kf_oj import __version__
+from kf_oj.core.settings import Settings
+
+
+def check_entrypoint(service: str) -> None:
+    parser = argparse.ArgumentParser(description=f"{service} process entrypoint")
+    parser.add_argument("--check", action="store_true", help="Validate configuration and exit")
+    args = parser.parse_args()
+    settings = Settings()
+    if not args.check:
+        parser.exit(2, f"{service}: task loop is not implemented; use --check\n")
+    print(
+        json.dumps(
+            {
+                "service": service,
+                "version": __version__,
+                "environment": settings.environment,
+                "status": "scaffold",
+                "consuming_tasks": False,
+            }
+        )
+    )
diff --git a/backend/src/kf_oj/workers/learning.py b/backend/src/kf_oj/workers/learning.py
new file mode 100644
index 0000000..a9fd012
--- /dev/null
+++ b/backend/src/kf_oj/workers/learning.py
@@ -0,0 +1,9 @@
+from kf_oj.workers.bootstrap import check_entrypoint
+
+
+def main() -> None:
+    check_entrypoint("learning-worker")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/backend/src/kf_oj/workers/outbox.py b/backend/src/kf_oj/workers/outbox.py
new file mode 100644
index 0000000..1e38949
--- /dev/null
+++ b/backend/src/kf_oj/workers/outbox.py
@@ -0,0 +1,9 @@
+from kf_oj.workers.bootstrap import check_entrypoint
+
+
+def main() -> None:
+    check_entrypoint("outbox-publisher")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/backend/tests/test_contracts.py b/backend/tests/test_contracts.py
new file mode 100644
index 0000000..250ab53
--- /dev/null
+++ b/backend/tests/test_contracts.py
@@ -0,0 +1,26 @@
+import json
+from pathlib import Path
+
+import pytest
+from jsonschema import Draft202012Validator, FormatChecker
+from pydantic import ValidationError
+
+from kf_oj.contracts.judge import JudgeTaskNotification
+
+ROOT = Path(__file__).resolve().parents[2]
+FIXTURES = ROOT / "tests/fixtures/contracts"
+SCHEMA = json.loads((ROOT / "contracts/schemas/judge-task.v1.schema.json").read_text())
+
+
+@pytest.mark.parametrize("path", sorted(FIXTURES.glob("judge-task.*.json")), ids=lambda p: p.stem)
+def test_shared_wire_examples(path: Path) -> None:
+    payload = json.loads(path.read_text())
+    validator = Draft202012Validator(SCHEMA, format_checker=FormatChecker())
+    if ".invalid-" in path.name:
+        with pytest.raises(ValidationError):
+            JudgeTaskNotification.model_validate(payload)
+        assert not validator.is_valid(payload)
+    else:
+        notification = JudgeTaskNotification.model_validate(payload)
+        validator.validate(payload)
+        assert notification.model_dump(mode="json") == payload
diff --git a/backend/tests/test_health.py b/backend/tests/test_health.py
new file mode 100644
index 0000000..76a1d16
--- /dev/null
+++ b/backend/tests/test_health.py
@@ -0,0 +1,33 @@
+import asyncio
+
+import httpx
+
+from kf_oj.api.app import create_app
+from kf_oj.core.settings import Settings
+
+
+def test_liveness_without_database_or_queue() -> None:
+    settings = Settings(_env_file=None, environment="test", database_url=None, amqp_url=None)
+
+    async def request():
+        async with httpx.AsyncClient(
+            transport=httpx.ASGITransport(app=create_app(settings)), base_url="http://test"
+        ) as client:
+            return await client.get("/api/v1/health/live")
+
+    response = asyncio.run(request())
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok", "service": "platform", "version": "0.0.1"}
+
+
+def test_production_disables_api_documentation() -> None:
+    app = create_app(Settings(_env_file=None, environment="production"))
+
+    async def request():
+        async with httpx.AsyncClient(
+            transport=httpx.ASGITransport(app=app), base_url="http://test"
+        ) as client:
+            for path in ("/api/docs", "/api/openapi.json"):
+                assert (await client.get(path)).status_code == 404
+
+    asyncio.run(request())
diff --git a/backend/uv.lock b/backend/uv.lock
new file mode 100644
index 0000000..34143de
--- /dev/null
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diff --git a/contracts/README.md b/contracts/README.md
new file mode 100644
index 0000000..054fe8d
--- /dev/null
+++ b/contracts/README.md
@@ -0,0 +1,14 @@
+# 跨服务契约
+
+`schemas/` 保存版本化 JSON Schema，`openapi/` 保存平台 API 快照。
+共享合法/非法样例位于 `tests/fixtures/contracts/`，Python 与 Rust 必须共同验证。
+
+目前只固定最小判题通知：`schema_version=1`、`kind=judge.evaluation`、UUID 格式的
+`evaluation_id`。它不包含源码、隐藏数据、租约或执行授权；消费者仍须向协调器领取。
+未知版本、未知类型及未知字段均拒绝。
+
+`make contracts` 从 Python 模型生成 Schema/OpenAPI，并生成前端 API 类型。
+`make check` 检查快照未过期及两种语言对样例的接受/拒绝一致。
+执行请求/报告、评测状态机、租约与结果提交契约在 JS-01/DR-01 中逐项补充。
+
+生成器 `export.py` 是开发工具，允许读取 API 组合层；运行期的契约模型禁止依赖业务模块。
diff --git a/contracts/openapi/platform.v1.json b/contracts/openapi/platform.v1.json
new file mode 100644
index 0000000..4401d71
--- /dev/null
+++ b/contracts/openapi/platform.v1.json
@@ -0,0 +1,62 @@
+{
+  "components": {
+    "schemas": {
+      "HealthResponse": {
+        "additionalProperties": false,
+        "properties": {
+          "service": {
+            "const": "platform",
+            "title": "Service",
+            "type": "string"
+          },
+          "status": {
+            "const": "ok",
+            "title": "Status",
+            "type": "string"
+          },
+          "version": {
+            "title": "Version",
+            "type": "string"
+          }
+        },
+        "required": [
+          "status",
+          "service",
+          "version"
+        ],
+        "title": "HealthResponse",
+        "type": "object"
+      }
+    }
+  },
+  "info": {
+    "description": "工程骨架。当前只提供进程存活检查，业务接口逐项实现。",
+    "title": "KF-OnlineJudge Platform API",
+    "version": "0.0.1"
+  },
+  "openapi": "3.1.0",
+  "paths": {
+    "/api/v1/health/live": {
+      "get": {
+        "description": "Check process liveness only; does not attest DB, queue or judge readiness.",
+        "operationId": "liveness",
+        "responses": {
+          "200": {
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HealthResponse"
+                }
+              }
+            },
+            "description": "Successful Response"
+          }
+        },
+        "summary": "Liveness",
+        "tags": [
+          "health"
+        ]
+      }
+    }
+  }
+}
diff --git a/contracts/schemas/judge-task.v1.schema.json b/contracts/schemas/judge-task.v1.schema.json
new file mode 100644
index 0000000..64475fb
--- /dev/null
+++ b/contracts/schemas/judge-task.v1.schema.json
@@ -0,0 +1,30 @@
+{
+  "$id": "urn:kf-oj:judge-task:v1",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": false,
+  "description": "A wake-up notification, not execution authority or the source of task state.",
+  "properties": {
+    "evaluation_id": {
+      "format": "uuid",
+      "title": "Evaluation Id",
+      "type": "string"
+    },
+    "kind": {
+      "const": "judge.evaluation",
+      "title": "Kind",
+      "type": "string"
+    },
+    "schema_version": {
+      "const": 1,
+      "title": "Schema Version",
+      "type": "integer"
+    }
+  },
+  "required": [
+    "schema_version",
+    "kind",
+    "evaluation_id"
+  ],
+  "title": "JudgeTaskNotification",
+  "type": "object"
+}
diff --git a/deploy/.env.example b/deploy/.env.example
new file mode 100644
index 0000000..844ded3
--- /dev/null
+++ b/deploy/.env.example
@@ -0,0 +1,10 @@
+# Development-only values; copy to deploy/.env before make infra-up.
+POSTGRES_USER=kf_oj
+POSTGRES_PASSWORD=local-dev-only
+POSTGRES_DB=kf_oj
+POSTGRES_PORT=5432
+RABBITMQ_USER=kf_oj
+RABBITMQ_PASSWORD=local-dev-only
+RABBITMQ_VHOST=kf_oj
+RABBITMQ_PORT=5672
+RABBITMQ_MANAGEMENT_PORT=15672
diff --git a/deploy/README.md b/deploy/README.md
new file mode 100644
index 0000000..c91f14e
--- /dev/null
+++ b/deploy/README.md
@@ -0,0 +1,21 @@
+# 本地开发依赖
+
+`compose.dev.yml` 只提供 PostgreSQL 和 RabbitMQ，端口绑定 localhost。
+先复制 `.env.example` 为 `.env`，然后在仓库根目录运行：
+
+```bash
+make infra-config
+make infra-up
+make infra-down
+```
+
+`infra-down` 保留数据卷；不要把示例口令用于正式部署。
+API 存活检查和前端预览不依赖这些容器，可以先独立启动。
+该 Compose 不运行判题 Worker 或不可信代码。
+
+镜像固定具体维护版本（PostgreSQL 18.6、RabbitMQ 4.3.6），正式实验前另锁镜像摘要。
+配置检查只验证 Compose 结构；成功启动、实际健康与备份恢复需要单独验证。
+后续受控主机服务和最小权限沙箱启动器配置放在本目录。
+
+官方镜像说明：[PostgreSQL](https://hub.docker.com/_/postgres)、
+[RabbitMQ](https://hub.docker.com/_/rabbitmq)。
diff --git a/deploy/compose.dev.yml b/deploy/compose.dev.yml
new file mode 100644
index 0000000..5eec5fc
--- /dev/null
+++ b/deploy/compose.dev.yml
@@ -0,0 +1,40 @@
+name: kf-oj-dev
+services:
+  postgres:
+    image: postgres:18.6-bookworm
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:?required}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?required}
+      POSTGRES_DB: ${POSTGRES_DB:?required}
+    ports:
+      - "127.0.0.1:${POSTGRES_PORT:-5432}:5432"
+    volumes:
+      - postgres-data:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
+      interval: 5s
+      timeout: 3s
+      retries: 20
+    mem_limit: 1g
+    cpus: 1
+  rabbitmq:
+    image: rabbitmq:4.3.6-management
+    environment:
+      RABBITMQ_DEFAULT_USER: ${RABBITMQ_USER:?required}
+      RABBITMQ_DEFAULT_PASS: ${RABBITMQ_PASSWORD:?required}
+      RABBITMQ_DEFAULT_VHOST: ${RABBITMQ_VHOST:?required}
+    ports:
+      - "127.0.0.1:${RABBITMQ_PORT:-5672}:5672"
+      - "127.0.0.1:${RABBITMQ_MANAGEMENT_PORT:-15672}:15672"
+    volumes:
+      - rabbitmq-data:/var/lib/rabbitmq
+    healthcheck:
+      test: ["CMD", "rabbitmq-diagnostics", "-q", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+    mem_limit: 768m
+    cpus: 1
+volumes:
+  postgres-data:
+  rabbitmq-data:
diff --git a/experiments/README.md b/experiments/README.md
new file mode 100644
index 0000000..166f5b6
--- /dev/null
+++ b/experiments/README.md
@@ -0,0 +1,7 @@
+# 可复现实验
+
+后续负载生成、调度对照、故障注入和统计脚本放在本目录；工程骨架阶段未开始性能实验。
+每次实验保存 Git 提交、环境、配置、负载摘要、原始事件、结果和复现命令。
+
+`results/` 默认忽略，报告只提交去标识摘要和原始材料的复现索引。
+每项实验先明确条件、正确性检查和验收指标，再运行并保留复现材料。
diff --git a/frontend/.env.example b/frontend/.env.example
new file mode 100644
index 0000000..8974b4d
--- /dev/null
+++ b/frontend/.env.example
@@ -0,0 +1,3 @@
+VITE_API_BASE_URL=
+# Development proxy only; never bundled into the browser as a credential.
+KF_API_PROXY_TARGET=http://127.0.0.1:8000
diff --git a/frontend/.node-version b/frontend/.node-version
new file mode 100644
index 0000000..8a94b99
--- /dev/null
+++ b/frontend/.node-version
@@ -0,0 +1 @@
+26.10.0
diff --git a/frontend/.npmrc b/frontend/.npmrc
new file mode 100644
index 0000000..bcad92e
--- /dev/null
+++ b/frontend/.npmrc
@@ -0,0 +1,2 @@
+# pnpm 11 reads project settings from pnpm-workspace.yaml.
+# Keep this file for future registry/auth configuration only.
diff --git a/frontend/.prettierignore b/frontend/.prettierignore
new file mode 100644
index 0000000..cabbe58
--- /dev/null
+++ b/frontend/.prettierignore
@@ -0,0 +1,4 @@
+pnpm-lock.yaml
+dist
+node_modules
+src/api/generated
diff --git a/frontend/.prettierrc.json b/frontend/.prettierrc.json
new file mode 100644
index 0000000..0965e7e
--- /dev/null
+++ b/frontend/.prettierrc.json
@@ -0,0 +1,6 @@
+{
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "printWidth": 100
+}
diff --git a/frontend/README.md b/frontend/README.md
new file mode 100644
index 0000000..3cc7779
--- /dev/null
+++ b/frontend/README.md
@@ -0,0 +1,27 @@
+# Vue 前端工程
+
+Vue 3 + TypeScript + Vite + Element Plus，使用 Vue Router 与 Pinia。
+当前页面是开发预览和实际 API 连接检查；没有模拟登录或模拟评测结果。
+
+```bash
+pnpm install --frozen-lockfile
+pnpm dev
+pnpm typecheck
+pnpm test
+pnpm build
+```
+
+开发服务在 `http://127.0.0.1:5173`，`/api` 代理到 `http://127.0.0.1:8000`。
+复制 `.env.example` 为 `.env` 可调整代理和 API 地址。
+生产部署须配置 SPA 路由回退及 `/api` 反向代理；开发代理不进入生产产物。
+
+- `views/`：路由页面；`layouts/`：页面框架；`components/`：可复用界面组件。
+- `api/`：HTTP 客户端和业务 API 封装；`api/generated/`：从 OpenAPI 生成的类型。
+- `composables/`：带生命周期的交互逻辑；`stores/`：跨页面共享状态。
+- `router/`：路由；`styles/`：全局样式。
+
+已有代码按实际需要落位；`components/` 和 `stores/` 是后续扩展位置，不放空状态实现。
+API 类型更新执行根目录 `make contracts`；前端通过 `pnpm check:api` 拒绝过期类型。
+登录凭据、模型密钥和数据库连接不能进入 `VITE_` 环境变量。
+
+`pnpm test` 验证代码草稿在刷新、切到后台与页面离开时的保存行为，已纳入 `make check-frontend`。
diff --git a/frontend/admin/index.html b/frontend/admin/index.html
new file mode 100644
index 0000000..ad457f0
--- /dev/null
+++ b/frontend/admin/index.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>KF 管理控制台</title>
+  </head>
+  <body>
+    <div id="admin-app"></div>
+    <script type="module" src="/src/admin/main.ts"></script>
+  </body>
+</html>
diff --git a/frontend/eslint.config.js b/frontend/eslint.config.js
new file mode 100644
index 0000000..d00c768
--- /dev/null
+++ b/frontend/eslint.config.js
@@ -0,0 +1,22 @@
+import js from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import vue from 'eslint-plugin-vue'
+import prettier from 'eslint-config-prettier/flat'
+
+export default tseslint.config(
+  { ignores: ['dist/**', 'node_modules/**', 'src/api/generated/**'] },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...vue.configs['flat/recommended'],
+  {
+    files: ['**/*.vue'],
+    languageOptions: { parserOptions: { parser: tseslint.parser } },
+    // TypeScript checks identifiers and DOM globals in Vue's script setup.
+    rules: { 'vue/multi-word-component-names': 'off', 'no-undef': 'off' },
+  },
+  {
+    files: ['vite.config.ts'],
+    languageOptions: { globals: { process: 'readonly' } },
+  },
+  prettier,
+)
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 0000000..3472db5
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#2563eb" />
+    <title>KF-OnlineJudge</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..58f7e6c
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "kf-oj-frontend",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "packageManager": "pnpm@11.28.4",
+  "engines": {
+    "node": ">=24.12.0 <27"
+  },
+  "scripts": {
+    "dev": "vite --host 127.0.0.1",
+    "build": "vue-tsc --noEmit && vite build",
+    "preview": "vite preview --host 127.0.0.1",
+    "typecheck": "vue-tsc --noEmit",
+    "test": "node --test tests/*.test.ts",
+    "lint": "eslint . --max-warnings 0",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
+    "generate:api": "openapi-typescript ../contracts/openapi/platform.v1.json -o src/api/generated/schema.d.ts",
+    "check:api": "pnpm generate:api --check"
+  },
+  "dependencies": {
+    "@element-plus/icons-vue": "2.3.2",
+    "@misskey-dev/tagcanvas-es": "0.1.2",
+    "element-plus": "^2.9.0",
+    "monaco-editor": "0.57.0",
+    "openapi-fetch": "^0.14.0",
+    "pinia": "^3.0.0",
+    "vue": "^3.5.0",
+    "vue-router": "^4.5.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.0",
+    "@types/node": "^24.0.0",
+    "@vitejs/plugin-vue": "^6.0.0",
+    "eslint": "^10.0.0",
+    "eslint-config-prettier": "10.1.8",
+    "eslint-plugin-vue": "^10.0.0",
+    "openapi-typescript": "^7.0.0",
+    "prettier": "^3.0.0",
+    "typescript": "~5.9.0",
+    "typescript-eslint": "^8.0.0",
+    "vite": "^7.0.0",
+    "vue-tsc": "^3.0.0"
+  }
+}
diff --git a/frontend/pnpm-lock.yaml b/frontend/pnpm-lock.yaml
new file mode 100644
index 0000000..8616279
--- /dev/null
+++ b/frontend/pnpm-lock.yaml
@@ -0,0 +1,2398 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
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+        version: 0.14.1
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+      vue-router:
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+        version: 4.6.4(vue@3.5.43(typescript@5.9.3))
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+        version: 24.19.1
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+        version: 10.1.8(eslint@10.12.0(supports-color@10.2.2))
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+    dependencies:
+      '@vue/compiler-dom': 3.5.43
+      '@vue/compiler-sfc': 3.5.43
+      '@vue/runtime-dom': 3.5.43
+      '@vue/server-renderer': 3.5.43
+      '@vue/shared': 3.5.43
+    optionalDependencies:
+      typescript: 5.9.3
+
+  which@2.0.2:
+    dependencies:
+      isexe: 2.0.0
+
+  word-wrap@1.2.5: {}
+
+  xml-name-validator@5.0.0: {}
+
+  yaml-ast-parser@0.0.43: {}
+
+  yargs-parser@21.1.1: {}
+
+  yocto-queue@0.1.0: {}
diff --git a/frontend/pnpm-workspace.yaml b/frontend/pnpm-workspace.yaml
new file mode 100644
index 0000000..51f6505
--- /dev/null
+++ b/frontend/pnpm-workspace.yaml
@@ -0,0 +1,4 @@
+saveExact: true
+verifyDepsBeforeRun: false
+allowBuilds:
+  esbuild: true
diff --git a/frontend/public/images/home-banner.svg b/frontend/public/images/home-banner.svg
new file mode 100644
index 0000000..483f2f0
--- /dev/null
+++ b/frontend/public/images/home-banner.svg
@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 440" fill="none">
+  <defs><linearGradient id="sky" x1="0" y1="0" x2="1200" y2="440" gradientUnits="userSpaceOnUse"><stop stop-color="#eff7ff"/><stop offset="1" stop-color="#c9e3fa"/></linearGradient><linearGradient id="veil"><stop stop-color="#edf6ff"/><stop offset=".53" stop-color="#edf6ff" stop-opacity=".9"/><stop offset="1" stop-color="#edf6ff" stop-opacity="0"/></linearGradient></defs>
+  <path fill="url(#sky)" d="M0 0h1200v440H0z"/><circle cx="973" cy="100" r="66" fill="#fff" opacity=".75"/>
+  <path d="m350 350 182-211 197 203 107-138 136 144 92-94 136 117v69H350z" fill="#b8d6ee"/><path d="m532 139 58 60-55-17-43 28z" fill="#ecf7ff"/><path d="m836 204 51 53-51-14-30 20z" fill="#e6f4ff"/>
+  <path d="M0 394c132-50 237-24 380-47s217-3 359 22 296-28 461-55v126H0z" fill="#aacbe5"/><path d="M0 414c135-28 304-1 506-11s414 3 694-39v76H0z" fill="#dcecf7"/>
+  <path d="M836 226h183v118H836z" fill="#f5faff"/><path d="m821 226 106-51 106 51z" fill="#79a9d2"/><path d="M905 271h41v73h-41z" fill="#a4c7e3"/><path d="M851 249h28v28h-28zm123 0h28v28h-28z" fill="#c2dcef"/>
+  <path d="M772 342h19v-67h-19z" fill="#779cbc"/><path d="m737 290 46-118 46 118z" fill="#8ab6cc"/><path d="m730 316 53-112 54 112z" fill="#77a6bc"/>
+  <path d="M1082 350h18v-93h-18z" fill="#779cbc"/><path d="m1035 291 56-131 57 131z" fill="#8cb8cf"/><path d="m1023 321 68-127 67 127z" fill="#77a6bf"/>
+  <path d="M883 355c-20 36-65 45-111 57" stroke="#f5faff" stroke-width="14" stroke-linecap="round"/>
+  <g stroke="#91bce0" opacity=".6"><rect x="674" y="81" width="114" height="75" rx="8" fill="#f3f9ff" transform="rotate(-9 674 81)"/><path d="m698 105-9 10 12 7m29-18 12 7-9 10m-6-22-8 26" stroke-width="3"/><rect x="1053" y="42" width="73" height="49" rx="6" fill="#f4faff" transform="rotate(7 1053 42)"/><path d="M1069 59h38m-38 10h26" stroke-width="3"/></g><path d="M0 0h1200v440H0z" fill="url(#veil)"/>
+</svg>
diff --git a/frontend/public/images/practice-space.svg b/frontend/public/images/practice-space.svg
new file mode 100644
index 0000000..626ae81
--- /dev/null
+++ b/frontend/public/images/practice-space.svg
@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="500" height="340" viewBox="0 0 500 340">
+  <defs><pattern id="dots" width="24" height="24" patternUnits="userSpaceOnUse"><circle cx="2" cy="2" r="1" fill="#b6d2ef"/></pattern><linearGradient id="paper" x2="0.8" y2="1"><stop stop-color="#fff"/><stop offset="1" stop-color="#f5faff"/></linearGradient></defs>
+  <rect x="28" y="12" width="444" height="308" rx="28" fill="url(#dots)"/>
+  <path d="M92 212v57h85v-43h97v49h140v-104" fill="none" stroke="#c8dff6" stroke-width="20" stroke-linejoin="round"/>
+  <path d="M92 212v57h85v-43h97v49h140v-104" fill="none" stroke="#76b5ee" stroke-width="2" stroke-dasharray="5 7"/>
+  <g transform="rotate(-5 231 118)"><rect x="73" y="30" width="308" height="183" rx="16" fill="#cfdef0" opacity=".4"/><rect x="65" y="22" width="308" height="183" rx="16" fill="url(#paper)" stroke="#c8dff6"/><path d="M65 60h308" stroke="#e2edf8"/><circle cx="86" cy="41" r="4" fill="#b9d6f2"/><circle cx="101" cy="41" r="4" fill="#d4e5f6"/><circle cx="116" cy="41" r="4" fill="#e2edf8"/><text x="145" y="45" font-family="monospace" font-size="10" fill="#8fa8c4">solution.cpp</text><text x="89" y="92" font-family="monospace" font-size="14" fill="#657e9e">int main() {</text><text x="106" y="122" font-family="monospace" font-size="14" fill="#409eff">cin &gt;&gt; a &gt;&gt; b;</text><text x="106" y="151" font-family="monospace" font-size="14" fill="#455e80">cout &lt;&lt; a + b;</text><text x="89" y="181" font-family="monospace" font-size="14" fill="#657e9e">}</text></g>
+  <g transform="rotate(6 377 185)"><rect x="307" y="144" width="151" height="82" rx="12" fill="#fff" stroke="#b6d2ef"/><text x="329" y="169" font-family="monospace" font-size="9" fill="#8fa8c4">01 / SIMPLE START</text><text x="329" y="204" font-family="monospace" font-size="25" font-weight="600" fill="#409eff">1 + 2 = 3</text></g>
+  <circle cx="92" cy="269" r="13" fill="#fff" stroke="#b9d6f2" stroke-width="2"/><text x="87" y="273" font-family="monospace" font-size="12" fill="#76a9de">A</text><circle cx="274" cy="275" r="13" fill="#409eff"/><path d="m268 275 4 4 8-9" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round"/><circle cx="414" cy="275" r="7" fill="#fff" stroke="#b9d6f2" stroke-width="2"/>
+  <text x="184" y="313" font-family="monospace" font-size="10" letter-spacing="3" fill="#8fa8c4">THINK / BUILD / REPEAT</text>
+</svg>
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
new file mode 100644
index 0000000..792e08c
--- /dev/null
+++ b/frontend/src/App.vue
@@ -0,0 +1,14 @@
+<script setup lang="ts">
+import AppLayout from './layouts/AppLayout.vue'
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
+</script>
+
+<template>
+  <el-config-provider :locale="zhCn">
+    <AppLayout>
+      <RouterView v-slot="{ Component, route }">
+        <component :is="Component" :key="route.path" />
+      </RouterView>
+    </AppLayout>
+  </el-config-provider>
+</template>
diff --git a/frontend/src/admin/AdminApp.vue b/frontend/src/admin/AdminApp.vue
new file mode 100644
index 0000000..3c81b9f
--- /dev/null
+++ b/frontend/src/admin/AdminApp.vue
@@ -0,0 +1,39 @@
+<script setup lang="ts">
+import { useRoute } from 'vue-router'
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
+import UiIcon from '../components/UiIcon.vue'
+import { adminSections } from './navigation'
+const route = useRoute()
+</script>
+<template>
+  <el-config-provider :locale="zhCn">
+    <div class="admin-application">
+      <header class="admin-app-header">
+        <a href="/admin/index.html" class="brand"
+          ><span class="brand-mark">KF.</span
+          ><span class="brand-name">管理控制台<small>ADMIN CONSOLE</small></span></a
+        >
+        <span class="admin-app-label">独立管理应用 · 界面预览</span>
+        <a href="/" class="admin-return">返回前台 <UiIcon name="arrow" /></a>
+      </header>
+      <nav class="admin-app-nav" aria-label="管理导航">
+        <RouterLink
+          v-for="section in adminSections"
+          :key="section.id"
+          :to="section.id === 'overview' ? '/' : '/' + section.id"
+          :aria-label="section.title"
+          :class="{ active: (route.params.section || 'overview') === section.id }"
+          ><UiIcon :name="section.icon" /><span>{{ section.title }}</span></RouterLink
+        >
+      </nav>
+      <main class="admin-app-main">
+        <RouterView v-slot="{ Component, route: currentRoute }"
+          ><component :is="Component" :key="currentRoute.path"
+        /></RouterView>
+      </main>
+      <footer class="admin-app-footer">
+        KF OnlineJudge / 管理控制台<span>示例数据 · 管理员授权与业务接口待接入</span>
+      </footer>
+    </div>
+  </el-config-provider>
+</template>
diff --git a/frontend/src/admin/AdminView.vue b/frontend/src/admin/AdminView.vue
new file mode 100644
index 0000000..c6535b7
--- /dev/null
+++ b/frontend/src/admin/AdminView.vue
@@ -0,0 +1,272 @@
+<script setup lang="ts">
+import { computed, reactive, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { problems, contests, rankings } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import SubmissionChart from '../components/SubmissionChart.vue'
+import EmptyState from '../components/EmptyState.vue'
+import { adminSections as sections } from './navigation'
+const route = useRoute()
+const section = computed(() => String(route.params.section || 'overview'))
+const current = computed(() => sections.find((s) => s.id === section.value))
+const query = ref('')
+const problemItems = computed(() => problems.filter((p) => (p.id + p.title).includes(query.value)))
+const contestItems = computed(() => contests.filter((c) => c.title.includes(query.value)))
+const userItems = computed(() =>
+  rankings.filter((u) => u.username.toLowerCase().includes(query.value.toLowerCase())),
+)
+const editOpen = ref(false)
+const draft = reactive({ id: '', title: '', difficulty: '入门', status: '公开' })
+const settings = reactive({
+  name: 'KF OnlineJudge',
+  slogan: '每一次提交，都有新的收获。',
+  registration: true,
+  announcement: '欢迎来到 KF OnlineJudge',
+  filing: '',
+})
+const nodes = [
+  {
+    name: 'home-worker-01',
+    host: 'Debian',
+    capacity: '4 核 / 8 GB',
+    status: '在线',
+    load: 32,
+    tasks: 2,
+  },
+  {
+    name: 'cloud-worker-01',
+    host: 'Ubuntu',
+    capacity: '8 核 / 8 GB',
+    status: '在线',
+    load: 46,
+    tasks: 4,
+  },
+  {
+    name: 'cloud-worker-02',
+    host: 'Ubuntu',
+    capacity: '2 核 / 2 GB',
+    status: '离线',
+    load: 0,
+    tasks: 0,
+  },
+]
+function editProblem(id?: string) {
+  const row = problems.find((problem) => problem.id === id)
+  Object.assign(draft, {
+    id: row?.id ?? '',
+    title: row?.title ?? '',
+    difficulty: row?.difficulty ?? '入门',
+    status: '公开',
+  })
+  editOpen.value = true
+}
+</script>
+<template>
+  <PageHeading
+    title="管理中心"
+    eyebrow="ADMINISTRATION"
+    description="管理界面预览 · 管理员身份与写入接口待接入。"
+    ><a href="/"><el-button>返回站点</el-button></a></PageHeading
+  >
+  <div class="admin-shell">
+    <div v-if="current" class="stack">
+      <template v-if="section === 'overview'"
+        ><div class="summary-grid">
+          <div class="summary-card">
+            <p>公开题目</p>
+            <strong>248</strong><small>示例统计</small>
+          </div>
+          <div class="summary-card">
+            <p>累计提交</p>
+            <strong>18,240</strong><small>示例统计</small>
+          </div>
+          <div class="summary-card">
+            <p>注册用户</p>
+            <strong>328</strong><small>示例统计</small>
+          </div>
+          <div class="summary-card">
+            <p>在线节点</p>
+            <strong>2 / 3</strong><small>示例统计</small>
+          </div>
+        </div>
+        <PanelCard title="提交趋势" icon="rankings"><SubmissionChart /></PanelCard
+        ><PanelCard title="开发接入状态" icon="connection"
+          ><el-descriptions :column="1" border
+            ><el-descriptions-item label="当前界面">前端预览</el-descriptions-item
+            ><el-descriptions-item label="账号与权限">待接入</el-descriptions-item
+            ><el-descriptions-item label="评测与节点状态">待接入</el-descriptions-item
+            ><el-descriptions-item label="管理写入与操作审计"
+              >待接入</el-descriptions-item
+            ></el-descriptions
+          ></PanelCard
+        ></template
+      >
+      <PanelCard
+        v-else-if="section === 'problems'"
+        title="题目管理"
+        icon="problems"
+        subtitle="示例题库"
+        ><template #actions
+          ><el-button size="small" type="primary" @click="editProblem()"
+            >新建题目草稿</el-button
+          ></template
+        >
+        <div class="filters">
+          <el-input
+            v-model="query"
+            placeholder="搜索题号或名称"
+            aria-label="搜索管理题目"
+            clearable
+          />
+        </div>
+        <el-table :data="problemItems" stripe
+          ><el-table-column label="题号" prop="id" width="80" /><el-table-column
+            label="名称"
+            prop="title"
+            min-width="190"
+          /><el-table-column label="难度" prop="difficulty" width="90" /><el-table-column
+            label="更新日期"
+            prop="updated"
+            width="130"
+          /><el-table-column label="操作" width="150"
+            ><template #default="{ row }"
+              ><el-button link type="primary" @click="editProblem(row.id)">编辑预览</el-button
+              ><a :href="'/problems/' + row.id" class="text-link" style="margin-left: 10px"
+                >查看</a
+              ></template
+            ></el-table-column
+          ></el-table
+        ></PanelCard
+      >
+      <PanelCard
+        v-else-if="section === 'contests'"
+        title="比赛管理"
+        icon="contests"
+        subtitle="示例赛程"
+        ><template #actions
+          ><el-button size="small" type="primary" disabled>创建比赛</el-button></template
+        >
+        <div class="filters">
+          <el-input v-model="query" placeholder="搜索比赛" aria-label="搜索管理比赛" clearable />
+        </div>
+        <el-table :data="contestItems" stripe
+          ><el-table-column label="比赛名称" prop="title" min-width="220" /><el-table-column
+            label="赛制"
+            prop="type"
+            width="75"
+          /><el-table-column label="状态" prop="status" width="120" /><el-table-column
+            label="开始时间"
+            prop="start"
+            min-width="165"
+          /><el-table-column label="操作" width="90"
+            ><template #default="{ row }"
+              ><a class="text-link" :href="'/contests/' + row.id">查看</a></template
+            ></el-table-column
+          ></el-table
+        ></PanelCard
+      >
+      <PanelCard v-else-if="section === 'users'" title="用户管理" icon="teams" subtitle="示例用户"
+        ><div class="filters">
+          <el-input v-model="query" placeholder="搜索用户名" aria-label="搜索管理用户" clearable />
+        </div>
+        <el-table :data="userItems" stripe
+          ><el-table-column label="用户名" prop="username" min-width="170" /><el-table-column
+            label="通过题目"
+            prop="solved"
+            width="100"
+          /><el-table-column label="竞赛积分" prop="rating" width="110" /><el-table-column
+            label="角色"
+            width="90"
+            ><template #default>用户</template></el-table-column
+          ><el-table-column label="操作" width="160"
+            ><template #default="{ row }"
+              ><a class="text-link" :href="'/users/' + row.username">查看主页</a
+              ><el-button link disabled style="margin-left: 12px">修改角色</el-button></template
+            ></el-table-column
+          ></el-table
+        ></PanelCard
+      >
+      <PanelCard
+        v-else-if="section === 'judges'"
+        title="判题节点"
+        icon="connection"
+        subtitle="示例监控数据"
+        ><p class="notice-strip">实际节点、负载、心跳和任务状态将在协调器接口接入后展示。</p>
+        <el-table :data="nodes" stripe
+          ><el-table-column label="节点" prop="name" min-width="170" /><el-table-column
+            label="系统"
+            prop="host"
+            width="100"
+          /><el-table-column label="资源" prop="capacity" min-width="135" /><el-table-column
+            label="状态"
+            width="90"
+            ><template #default="{ row }"
+              ><span class="status-dot" :class="{ offline: row.status === '离线' }" />{{
+                row.status
+              }}</template
+            ></el-table-column
+          ><el-table-column label="负载" min-width="140"
+            ><template #default="{ row }"
+              ><el-progress :percentage="row.load" :stroke-width="5" /></template></el-table-column
+          ><el-table-column label="任务" prop="tasks" width="70" /><el-table-column
+            label="操作"
+            width="100"
+            ><template #default
+              ><el-button link disabled>暂停接单</el-button></template
+            ></el-table-column
+          ></el-table
+        >
+        <div class="comment-placeholder">
+          队列积压、租约过期、重试记录与故障恢复操作待接入。
+        </div></PanelCard
+      >
+      <PanelCard v-else-if="section === 'settings'" title="站点设置" icon="settings"
+        ><el-form label-position="top" style="max-width: 700px" @submit.prevent
+          ><el-form-item label="站点名称"><el-input v-model="settings.name" /></el-form-item
+          ><el-form-item label="站点标语"><el-input v-model="settings.slogan" /></el-form-item
+          ><el-form-item label="首页公告"
+            ><el-input v-model="settings.announcement" type="textarea" :rows="3" /></el-form-item
+          ><el-form-item label="备案信息"
+            ><el-input
+              v-model="settings.filing"
+              placeholder="上线前填写真实备案信息" /></el-form-item
+          ><el-form-item label="允许注册"
+            ><el-switch v-model="settings.registration"
+          /></el-form-item>
+          <div class="form-actions">
+            <el-button type="primary" disabled>保存设置</el-button
+            ><span class="muted">当前编辑只在本页面预览</span>
+          </div></el-form
+        ></PanelCard
+      >
+    </div>
+    <EmptyState v-else title="管理页面不存在" />
+  </div>
+  <el-dialog
+    v-model="editOpen"
+    :title="draft.id ? '编辑题目 · ' + draft.id : '新建题目草稿'"
+    width="min(600px, 92vw)"
+    ><el-form label-position="top"
+      ><el-form-item label="题目名称"
+        ><el-input v-model="draft.title" placeholder="填写题目名称" /></el-form-item
+      ><el-form-item label="难度"
+        ><el-select v-model="draft.difficulty"
+          ><el-option
+            v-for="d in ['入门', '简单', '中等', '困难']"
+            :key="d"
+            :label="d"
+            :value="d" /></el-select></el-form-item
+      ><el-form-item label="发布状态"
+        ><el-radio-group v-model="draft.status"
+          ><el-radio value="公开">公开</el-radio
+          ><el-radio value="草稿">草稿</el-radio></el-radio-group
+        ></el-form-item
+      >
+      <p class="small muted">题面编辑、测试数据和版本发布将在题库接口接入后启用。</p></el-form
+    ><template #footer
+      ><el-button @click="editOpen = false">关闭预览</el-button
+      ><el-button type="primary" disabled>保存题目</el-button></template
+    ></el-dialog
+  >
+</template>
diff --git a/frontend/src/admin/main.ts b/frontend/src/admin/main.ts
new file mode 100644
index 0000000..49dfc10
--- /dev/null
+++ b/frontend/src/admin/main.ts
@@ -0,0 +1,10 @@
+import { createApp } from 'vue'
+import { registerUi } from '../plugins/ui'
+import { adminRouter } from './router'
+import AdminApp from './AdminApp.vue'
+import '../styles/base.css'
+import '../styles/blueprint.css'
+
+const app = createApp(AdminApp)
+registerUi(app)
+app.use(adminRouter).mount('#admin-app')
diff --git a/frontend/src/admin/navigation.ts b/frontend/src/admin/navigation.ts
new file mode 100644
index 0000000..9d70ebf
--- /dev/null
+++ b/frontend/src/admin/navigation.ts
@@ -0,0 +1,8 @@
+export const adminSections = [
+  { id: 'overview', title: '概览', icon: 'monitor' },
+  { id: 'problems', title: '题目管理', icon: 'problems' },
+  { id: 'contests', title: '比赛管理', icon: 'contests' },
+  { id: 'users', title: '用户管理', icon: 'teams' },
+  { id: 'judges', title: '判题节点', icon: 'connection' },
+  { id: 'settings', title: '站点设置', icon: 'settings' },
+]
diff --git a/frontend/src/admin/router.ts b/frontend/src/admin/router.ts
new file mode 100644
index 0000000..eac06de
--- /dev/null
+++ b/frontend/src/admin/router.ts
@@ -0,0 +1,12 @@
+import { createRouter, createWebHashHistory } from 'vue-router'
+import { adminSections } from './navigation'
+
+export const adminRouter = createRouter({
+  history: createWebHashHistory('/admin/index.html'),
+  scrollBehavior: () => ({ top: 0 }),
+  routes: [{ path: '/:section?', component: () => import('./AdminView.vue') }],
+})
+adminRouter.afterEach((to) => {
+  const section = adminSections.find((item) => item.id === (to.params.section || 'overview'))
+  document.title = `${section?.title ?? '页面不存在'} · KF 管理控制台`
+})
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
new file mode 100644
index 0000000..ac8260f
--- /dev/null
+++ b/frontend/src/api/client.ts
@@ -0,0 +1,6 @@
+import createClient from 'openapi-fetch'
+import type { paths } from './generated/schema'
+
+export const api = createClient<paths>({
+  baseUrl: import.meta.env.VITE_API_BASE_URL || '',
+})
diff --git a/frontend/src/api/generated/schema.d.ts b/frontend/src/api/generated/schema.d.ts
new file mode 100644
index 0000000..1872ce9
--- /dev/null
+++ b/frontend/src/api/generated/schema.d.ts
@@ -0,0 +1,75 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+    "/api/v1/health/live": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * Liveness
+         * @description Check process liveness only; does not attest DB, queue or judge readiness.
+         */
+        get: operations["liveness"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+}
+export type webhooks = Record<string, never>;
+export interface components {
+    schemas: {
+        /** HealthResponse */
+        HealthResponse: {
+            /**
+             * Service
+             * @constant
+             */
+            service: "platform";
+            /**
+             * Status
+             * @constant
+             */
+            status: "ok";
+            /** Version */
+            version: string;
+        };
+    };
+    responses: never;
+    parameters: never;
+    requestBodies: never;
+    headers: never;
+    pathItems: never;
+}
+export type $defs = Record<string, never>;
+export interface operations {
+    liveness: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HealthResponse"];
+                };
+            };
+        };
+    };
+}
diff --git a/frontend/src/api/health.ts b/frontend/src/api/health.ts
new file mode 100644
index 0000000..855d682
--- /dev/null
+++ b/frontend/src/api/health.ts
@@ -0,0 +1,9 @@
+import { api } from './client'
+
+export async function fetchLiveness(signal: AbortSignal) {
+  const { data, error, response } = await api.GET('/api/v1/health/live', { signal })
+  if (!response.ok || error || !data) {
+    throw new Error(`平台暂时无法连接（HTTP ${response.status}）`)
+  }
+  return data
+}
diff --git a/frontend/src/components/CodeEditor.vue b/frontend/src/components/CodeEditor.vue
new file mode 100644
index 0000000..ab88a09
--- /dev/null
+++ b/frontend/src/components/CodeEditor.vue
@@ -0,0 +1,84 @@
+<script setup lang="ts">
+import { onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import * as monaco from 'monaco-editor/editor/editor.api'
+import 'monaco-editor/features/bracketMatching/register'
+import 'monaco-editor/features/clipboard/register'
+import 'monaco-editor/features/comment/register'
+import 'monaco-editor/features/contextmenu/register'
+import 'monaco-editor/features/find/register'
+import 'monaco-editor/features/linesOperations/register'
+import 'monaco-editor/features/wordOperations/register'
+import 'monaco-editor/languages/definitions/cpp/register'
+import 'monaco-editor/languages/definitions/python/register'
+import 'monaco-editor/languages/definitions/rust/register'
+import EditorWorker from 'monaco-editor/editor/editor.worker?worker'
+const props = defineProps<{
+  modelValue: string
+  language: string
+  theme: string
+  fontSize: number
+}>()
+const emit = defineEmits<{ 'update:modelValue': [value: string] }>()
+const container = ref<HTMLDivElement>()
+let editor: monaco.editor.IStandaloneCodeEditor | undefined
+let model: monaco.editor.ITextModel | undefined
+let subscription: monaco.IDisposable | undefined
+;(
+  globalThis as typeof globalThis & { MonacoEnvironment?: { getWorker: () => Worker } }
+).MonacoEnvironment = { getWorker: () => new EditorWorker() }
+onMounted(() => {
+  if (!container.value) return
+  model = monaco.editor.createModel(props.modelValue, props.language)
+  editor = monaco.editor.create(container.value, {
+    model,
+    theme: props.theme,
+    fontSize: props.fontSize,
+    minimap: { enabled: false },
+    automaticLayout: true,
+    scrollBeyondLastLine: false,
+    padding: { top: 18 },
+    tabSize: 4,
+    ariaLabel: '代码编辑器',
+    lineNumbersMinChars: 3,
+    wordWrap: 'on',
+    renderLineHighlight: 'line',
+    contextmenu: true,
+  })
+  subscription = editor.onDidChangeModelContent(() => {
+    emit('update:modelValue', editor!.getValue())
+  })
+})
+watch(
+  () => props.modelValue,
+  (value) => {
+    if (model && value !== model.getValue()) model.setValue(value)
+  },
+)
+watch(
+  () => props.language,
+  (value) => {
+    if (model) monaco.editor.setModelLanguage(model, value)
+  },
+)
+watch(
+  () => props.theme,
+  (value) => monaco.editor.setTheme(value),
+)
+watch(
+  () => props.fontSize,
+  (value) => editor?.updateOptions({ fontSize: value }),
+)
+onBeforeUnmount(() => {
+  subscription?.dispose()
+  editor?.dispose()
+  model?.dispose()
+})
+</script>
+<template><div ref="container" class="monaco-container" /></template>
+<style scoped>
+.monaco-container {
+  width: 100%;
+  height: 100%;
+  min-height: 320px;
+}
+</style>
diff --git a/frontend/src/components/DifficultyTag.vue b/frontend/src/components/DifficultyTag.vue
new file mode 100644
index 0000000..ccac152
--- /dev/null
+++ b/frontend/src/components/DifficultyTag.vue
@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { Difficulty } from '../data/preview'
+defineProps<{ value: Difficulty | string }>()
+</script>
+<template>
+  <span
+    class="difficulty"
+    :class="{
+      'difficulty-easy': value === '入门' || value === '简单',
+      'difficulty-medium': value === '中等',
+      'difficulty-hard': value === '困难',
+    }"
+    >{{ value }}</span
+  >
+</template>
diff --git a/frontend/src/components/EmptyState.vue b/frontend/src/components/EmptyState.vue
new file mode 100644
index 0000000..922cbe2
--- /dev/null
+++ b/frontend/src/components/EmptyState.vue
@@ -0,0 +1,10 @@
+<script setup lang="ts">
+defineProps<{ title: string; description?: string }>()
+</script>
+<template>
+  <div class="empty-state">
+    <el-empty :description="title" :image-size="80" />
+    <p v-if="description" class="muted">{{ description }}</p>
+    <slot />
+  </div>
+</template>
diff --git a/frontend/src/components/PageHeading.vue b/frontend/src/components/PageHeading.vue
new file mode 100644
index 0000000..b11b840
--- /dev/null
+++ b/frontend/src/components/PageHeading.vue
@@ -0,0 +1,13 @@
+<script setup lang="ts">
+defineProps<{ title: string; description?: string; eyebrow?: string }>()
+</script>
+<template>
+  <header class="page-heading">
+    <div>
+      <p v-if="eyebrow" class="eyebrow">{{ eyebrow }}</p>
+      <h1>{{ title }}</h1>
+      <p v-if="description" class="muted">{{ description }}</p>
+    </div>
+    <div class="page-heading-actions"><slot /></div>
+  </header>
+</template>
diff --git a/frontend/src/components/PanelCard.vue b/frontend/src/components/PanelCard.vue
new file mode 100644
index 0000000..1f42cfa
--- /dev/null
+++ b/frontend/src/components/PanelCard.vue
@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import UiIcon from './UiIcon.vue'
+defineProps<{ title: string; icon?: string; subtitle?: string }>()
+</script>
+<template>
+  <section class="panel">
+    <header class="panel-heading">
+      <h2>
+        <UiIcon v-if="icon" :name="icon" />{{ title }}<small v-if="subtitle">{{ subtitle }}</small>
+      </h2>
+      <div class="panel-actions"><slot name="actions" /></div>
+    </header>
+    <div class="panel-body"><slot /></div>
+  </section>
+</template>
diff --git a/frontend/src/components/ProblemTable.vue b/frontend/src/components/ProblemTable.vue
new file mode 100644
index 0000000..26db178
--- /dev/null
+++ b/frontend/src/components/ProblemTable.vue
@@ -0,0 +1,39 @@
+<script setup lang="ts">
+import { acceptance, type Problem } from '../data/preview'
+import DifficultyTag from './DifficultyTag.vue'
+defineProps<{ items: Problem[]; compact?: boolean }>()
+</script>
+<template>
+  <el-table :data="items" stripe style="width: 100%" empty-text="没有符合条件的题目">
+    <el-table-column prop="id" label="题号" width="90"
+      ><template #default="{ row }"
+        ><span class="mono muted">{{ row.id }}</span></template
+      ></el-table-column
+    >
+    <el-table-column label="题目" min-width="190"
+      ><template #default="{ row }"
+        ><RouterLink class="table-link" :to="`/problems/${row.id}`">{{
+          row.title
+        }}</RouterLink></template
+      ></el-table-column
+    >
+    <el-table-column v-if="!compact" label="标签" min-width="180"
+      ><template #default="{ row }"
+        ><div class="tag-list">
+          <span v-for="tag in row.tags" :key="tag" class="tag">{{ tag }}</span>
+        </div></template
+      ></el-table-column
+    >
+    <el-table-column label="难度" width="90"
+      ><template #default="{ row }"><DifficultyTag :value="row.difficulty" /></template
+    ></el-table-column>
+    <el-table-column label="通过率" width="100" align="right"
+      ><template #default="{ row }"
+        ><span class="muted tabular"
+          >{{ acceptance({ accepted: row.accepted, submissions: row.submissions }) }}%</span
+        ></template
+      ></el-table-column
+    >
+    <el-table-column v-if="!compact" prop="updated" label="更新日期" width="125" />
+  </el-table>
+</template>
diff --git a/frontend/src/components/SubmissionChart.vue b/frontend/src/components/SubmissionChart.vue
new file mode 100644
index 0000000..79bc754
--- /dev/null
+++ b/frontend/src/components/SubmissionChart.vue
@@ -0,0 +1,150 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+const showAccepted = ref(true)
+const showTotal = ref(true)
+const points = [
+  { day: '09-28', total: 44, accepted: 28 },
+  { day: '09-29', total: 68, accepted: 43 },
+  { day: '09-30', total: 52, accepted: 32 },
+  { day: '10-01', total: 91, accepted: 57 },
+  { day: '10-02', total: 77, accepted: 46 },
+  { day: '10-03', total: 116, accepted: 74 },
+  { day: '10-04', total: 96, accepted: 62 },
+]
+const active = ref<number | null>(null)
+const x = (index: number) => 55 + index * 111
+const y = (value: number) => 192 - (value / 120) * 155
+const line = (field: 'total' | 'accepted') =>
+  points.map((point, index) => x(index) + ',' + y(point[field])).join(' ')
+const selected = computed(() => (active.value === null ? undefined : points[active.value]))
+</script>
+<template>
+  <div class="submission-chart">
+    <div class="chart-legend">
+      <button :aria-pressed="showAccepted" @click="showAccepted = !showAccepted">
+        <span class="chart-dot accepted" />通过</button
+      ><button :aria-pressed="showTotal" @click="showTotal = !showTotal">
+        <span class="chart-dot total" />总提交</button
+      ><span class="muted">单位：次 · 示例统计</span>
+    </div>
+    <svg
+      viewBox="0 0 770 240"
+      role="img"
+      aria-label="近七天示例提交趋势：总提交44、68、52、91、77、116、96次"
+    >
+      <g v-for="tick in [0, 30, 60, 90, 120]" :key="tick">
+        <line x1="55" x2="721" :y1="y(tick)" :y2="y(tick)" stroke="#edf1f6" />
+        <text x="42" :y="y(tick) + 4" text-anchor="end">{{ tick }}</text>
+      </g>
+      <g v-for="(point, index) in points" :key="point.day">
+        <text :x="x(index)" y="219" text-anchor="middle">{{ point.day }}</text>
+      </g>
+      <polyline
+        v-if="showTotal"
+        :points="line('total')"
+        fill="none"
+        stroke="#76b5ee"
+        stroke-width="2"
+        stroke-linejoin="round"
+      />
+      <polyline
+        v-if="showAccepted"
+        :points="line('accepted')"
+        fill="none"
+        stroke="#8ccdab"
+        stroke-width="2"
+        stroke-linejoin="round"
+      />
+      <g v-for="(point, index) in points" :key="index">
+        <circle
+          v-if="showTotal"
+          :cx="x(index)"
+          :cy="y(point.total)"
+          r="3"
+          fill="white"
+          stroke="#76b5ee"
+        />
+        <circle
+          v-if="showAccepted"
+          :cx="x(index)"
+          :cy="y(point.accepted)"
+          r="3"
+          fill="white"
+          stroke="#8ccdab"
+        />
+        <rect
+          :x="x(index) - 20"
+          y="25"
+          width="40"
+          height="174"
+          fill="transparent"
+          @mouseenter="active = index"
+          @mouseleave="active = null"
+        >
+          <title>{{ point.day }}：总提交 {{ point.total }}，通过 {{ point.accepted }}</title>
+        </rect>
+      </g>
+    </svg>
+    <p class="chart-detail" aria-live="polite">
+      {{
+        selected
+          ? selected.day + ' · 总提交 ' + selected.total + ' 次 · 通过 ' + selected.accepted + ' 次'
+          : '近 7 天的提交与通过情况'
+      }}
+    </p>
+  </div>
+</template>
+<style scoped>
+.chart-legend {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 20px;
+  flex-wrap: wrap;
+  font-size: 11px;
+  margin-bottom: 10px;
+}
+.chart-legend button {
+  border: 0;
+  background: none;
+  color: #8797ac;
+  font-size: 12px;
+  display: flex;
+  gap: 7px;
+  align-items: center;
+  padding: 3px;
+}
+.chart-legend button[aria-pressed='false'] {
+  opacity: 0.4;
+}
+.chart-dot {
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  display: inline-block;
+}
+.accepted {
+  background: #8ccdab;
+}
+.total {
+  background: #76b5ee;
+}
+.submission-chart svg {
+  display: block;
+  width: 100%;
+  height: auto;
+}
+.submission-chart text {
+  font:
+    11px Inter,
+    'Microsoft YaHei',
+    sans-serif;
+  fill: #9aa8b9;
+}
+.chart-detail {
+  text-align: center;
+  color: #9cabbd;
+  font-size: 11px;
+  min-height: 20px;
+}
+</style>
diff --git a/frontend/src/components/SubmissionTable.vue b/frontend/src/components/SubmissionTable.vue
new file mode 100644
index 0000000..495629f
--- /dev/null
+++ b/frontend/src/components/SubmissionTable.vue
@@ -0,0 +1,40 @@
+<script setup lang="ts">
+import { findProblem, type submissions } from '../data/preview'
+import VerdictTag from './VerdictTag.vue'
+defineProps<{ items: typeof submissions; compact?: boolean }>()
+</script>
+<template>
+  <el-table :data="items" stripe empty-text="暂无符合条件的评测记录"
+    ><el-table-column label="提交编号" width="100"
+      ><template #default="{ row }"
+        ><RouterLink class="table-link mono" :to="'/submissions/' + row.id"
+          >#{{ row.id }}</RouterLink
+        ></template
+      ></el-table-column
+    ><el-table-column label="题目" min-width="180"
+      ><template #default="{ row }"
+        ><RouterLink class="table-link" :to="'/problems/' + row.problemId">{{
+          findProblem(row.problemId)?.title
+        }}</RouterLink></template
+      ></el-table-column
+    ><el-table-column v-if="!compact" label="用户" min-width="120"
+      ><template #default="{ row }"
+        ><RouterLink :to="'/users/' + row.username">{{ row.username }}</RouterLink></template
+      ></el-table-column
+    ><el-table-column label="结果" width="110"
+      ><template #default="{ row }"><VerdictTag :value="row.verdict" /></template></el-table-column
+    ><el-table-column label="语言" prop="language" width="90" /><el-table-column
+      v-if="!compact"
+      label="用时"
+      width="90"
+      align="right"
+      ><template #default="{ row }">{{
+        row.time === null ? '—' : row.time + ' ms'
+      }}</template></el-table-column
+    ><el-table-column v-if="!compact" label="内存" width="100" align="right"
+      ><template #default="{ row }">{{
+        row.memory === null ? '—' : row.memory + ' KiB'
+      }}</template></el-table-column
+    ><el-table-column label="提交时间" prop="created" min-width="175"
+  /></el-table>
+</template>
diff --git a/frontend/src/components/TagSphere.vue b/frontend/src/components/TagSphere.vue
new file mode 100644
index 0000000..03cea6f
--- /dev/null
+++ b/frontend/src/components/TagSphere.vue
@@ -0,0 +1,270 @@
+<script setup lang="ts">
+import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import { TagCanvas } from '@misskey-dev/tagcanvas-es'
+
+const props = defineProps<{ tags: readonly string[] }>()
+const emit = defineEmits<{ select: [tag: string] }>()
+const stage = ref<HTMLDivElement>()
+const canvas = ref<HTMLCanvasElement>()
+const source = ref<HTMLDivElement>()
+const width = ref(300)
+const ready = ref(false)
+const rotationEnabled = ref(true)
+const interaction = ref<'follow' | 'drag'>('follow')
+const visible = ref(false)
+const hidden = ref(false)
+const colors = ['#409eff', '#638ac5', '#588db8', '#7496b8']
+const fontSize = computed(() => {
+  const textArea = props.tags.reduce((sum, tag) => sum + [...tag].length + 1.8, 0)
+  const radius = Math.max(35, (Math.min(width.value, 300) - 68) / 2)
+  return Math.max(
+    12,
+    Math.min(19, Math.sqrt((4 * Math.PI * radius ** 2 * 0.23) / Math.max(1, textArea * 1.35))),
+  )
+})
+function weight(tag: string, index: number) {
+  const emphasis = ['动态规划', '图论'].includes(tag) ? 1.2 : index % 3 === 0 ? 1.08 : 1
+  return emphasis * Math.min(1, Math.sqrt(4 / Math.max(1, [...tag].length)))
+}
+
+let cloud: TagCanvas | undefined
+let resizeObserver: ResizeObserver | undefined
+let intersectionObserver: IntersectionObserver | undefined
+let motionQuery: MediaQueryList | undefined
+
+function syncAnimation() {
+  if (!visible.value || hidden.value) cloud?.pause()
+  else cloud?.resume()
+}
+function rebuild() {
+  cloud?.destroy()
+  cloud = undefined
+  ready.value = false
+  if (!canvas.value || !stage.value || !source.value || !props.tags.length) return
+  const ratio = Math.min(2, window.devicePixelRatio || 1)
+  canvas.value.width = Math.round(width.value * ratio)
+  canvas.value.height = 300 * ratio
+  try {
+    cloud = new TagCanvas(canvas.value, {
+      tagContainer: source.value,
+      hideTags: false,
+      shape: 'sphere',
+      textColor: null,
+      textFont: getComputedStyle(stage.value).fontFamily,
+      textHeight: fontSize.value * ratio,
+      weight: props.tags.length > 1,
+      weightFrom: 'data-weight',
+      weightMode: 'size',
+      weightSizeMin: (fontSize.value - 1) * ratio,
+      weightSizeMax: (fontSize.value + 2) * ratio,
+      bgColor: '#f0f7ff',
+      bgOutline: '#cfe2f7',
+      bgOutlineThickness: ratio,
+      bgRadius: 14 * ratio,
+      padding: 5 * ratio,
+      outlineColor: '#409eff',
+      outlineThickness: ratio,
+      outlineRadius: 14 * ratio,
+      outlineOffset: 1 * ratio,
+      outlineMethod: 'outline',
+      minBrightness: 0.45,
+      maxBrightness: 1,
+      depth: 0.55,
+      zoom: 0.98,
+      maxSpeed: rotationEnabled.value ? 0.02 : 0,
+      initial: rotationEnabled.value ? [0.16, -0.08] : [0, 0],
+      decel: 0.94,
+      dragControl: interaction.value === 'drag',
+      dragThreshold: 4,
+      freezeActive: true,
+      freezeDecel: true,
+      wheelZoom: false,
+      noTagsMessage: false,
+      activeAudio: false,
+      txtScale: 2,
+    })
+    ready.value = true
+    syncAnimation()
+  } catch {
+    // Keep the ordinary links available when canvas rendering is unavailable.
+    ready.value = false
+  }
+}
+function updateVisibility() {
+  hidden.value = document.hidden
+}
+function updateMotionPreference() {
+  if (motionQuery?.matches) rotationEnabled.value = false
+}
+watch([() => props.tags, width, rotationEnabled, interaction], rebuild, {
+  deep: true,
+  flush: 'post',
+})
+watch([visible, hidden], syncAnimation)
+onMounted(() => {
+  if (!stage.value) return
+  width.value = stage.value.getBoundingClientRect().width
+  motionQuery = window.matchMedia('(prefers-reduced-motion: reduce)')
+  rotationEnabled.value = !motionQuery.matches
+  if (window.matchMedia('(pointer: coarse)').matches) interaction.value = 'drag'
+  motionQuery.addEventListener('change', updateMotionPreference)
+  updateVisibility()
+  document.addEventListener('visibilitychange', updateVisibility)
+  resizeObserver = new ResizeObserver(([entry]) => {
+    if (entry) width.value = entry.contentRect.width
+  })
+  resizeObserver.observe(stage.value)
+  intersectionObserver = new IntersectionObserver(([entry]) => {
+    visible.value = !!entry?.isIntersecting
+  })
+  intersectionObserver.observe(stage.value)
+  rebuild()
+})
+onBeforeUnmount(() => {
+  cloud?.destroy()
+  resizeObserver?.disconnect()
+  intersectionObserver?.disconnect()
+  motionQuery?.removeEventListener('change', updateMotionPreference)
+  document.removeEventListener('visibilitychange', updateVisibility)
+})
+</script>
+
+<template>
+  <div class="tag-sphere">
+    <div ref="stage" class="tag-sphere-stage" role="group" aria-label="球形题目标签">
+      <canvas
+        v-show="ready"
+        ref="canvas"
+        class="sphere-canvas"
+        :class="{ draggable: interaction === 'drag' }"
+        role="img"
+        :aria-label="`球形标签云，${interaction === 'drag' ? '拖动旋转' : '跟随鼠标旋转'}，点击标签筛选题目。键盘可选择下方标签链接。`"
+      />
+      <div
+        ref="source"
+        class="sphere-source"
+        :class="{ 'source-hidden': ready }"
+        aria-label="题目标签"
+      >
+        <a
+          v-for="(tag, index) in tags"
+          :key="tag"
+          :href="'/problems?tag=' + encodeURIComponent(tag)"
+          :style="{ color: colors[index % colors.length] }"
+          :data-weight="weight(tag, index)"
+          @click.prevent="emit('select', tag)"
+          >{{ tag }}</a
+        >
+      </div>
+      <p v-if="!tags.length" class="sphere-empty">暂无题目标签</p>
+    </div>
+    <div v-if="ready" class="sphere-controls">
+      <span>点击标签查看题目</span>
+      <div class="sphere-control-buttons">
+        <button
+          :aria-pressed="interaction === 'drag'"
+          aria-label="切换标签球交互方式"
+          @click="interaction = interaction === 'follow' ? 'drag' : 'follow'"
+        >
+          {{ interaction === 'follow' ? '鼠标跟随' : '拖动旋转' }}
+        </button>
+        <button :aria-pressed="rotationEnabled" @click="rotationEnabled = !rotationEnabled">
+          {{ rotationEnabled ? '暂停旋转' : '开始旋转' }}
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.tag-sphere-stage {
+  position: relative;
+  width: 100%;
+  height: 300px;
+}
+.sphere-canvas {
+  width: 100%;
+  height: 300px;
+  display: block;
+  touch-action: none;
+  user-select: none;
+}
+.sphere-canvas.draggable {
+  cursor: grab;
+}
+.sphere-canvas.draggable:active {
+  cursor: grabbing;
+}
+.sphere-source {
+  display: flex;
+  align-content: center;
+  justify-content: center;
+  flex-wrap: wrap;
+  gap: 10px;
+  height: 100%;
+  padding: 20px;
+}
+.sphere-source a {
+  padding: 5px 10px;
+  background: #f0f7ff;
+  border: 1px solid #dceaf9;
+  border-radius: 999px;
+  font-size: 14px;
+}
+.sphere-source.source-hidden {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  overflow: hidden;
+  clip-path: inset(50%);
+}
+.sphere-source.source-hidden:focus-within {
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  padding: 20px;
+  clip-path: none;
+  overflow: auto;
+  background: #fff;
+}
+.sphere-source a:focus-visible {
+  outline: 2px solid #409eff;
+  outline-offset: 2px;
+}
+.sphere-empty {
+  position: absolute;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  color: #99aabd;
+  font-size: 14px;
+}
+.sphere-controls {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 8px;
+  color: #99aabd;
+  font-size: 11px;
+  padding-top: 4px;
+}
+.sphere-control-buttons {
+  display: flex;
+  gap: 6px;
+}
+.sphere-controls button {
+  color: #629edb;
+  background: #f5faff;
+  border: 1px solid #e6f0fb;
+  border-radius: 6px;
+  padding: 4px 8px;
+  font-size: 11px;
+  cursor: pointer;
+}
+.sphere-controls button:focus-visible {
+  outline: 2px solid #90c2fb;
+  outline-offset: 2px;
+}
+</style>
diff --git a/frontend/src/components/UiIcon.vue b/frontend/src/components/UiIcon.vue
new file mode 100644
index 0000000..f11e6cb
--- /dev/null
+++ b/frontend/src/components/UiIcon.vue
@@ -0,0 +1,54 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import {
+  House,
+  Grid,
+  Collection,
+  Trophy,
+  Tickets,
+  Histogram,
+  ChatDotRound,
+  UserFilled,
+  InfoFilled,
+  Setting,
+  ArrowRight,
+  Refresh,
+  Search,
+  Monitor,
+  Bell,
+  ArrowDown,
+  Reading,
+  Document,
+  Clock,
+  Connection,
+  FolderOpened,
+} from '@element-plus/icons-vue'
+const props = defineProps<{ name: string }>()
+const icons = {
+  home: House,
+  problems: Grid,
+  trainings: Collection,
+  contests: Trophy,
+  submissions: Tickets,
+  rankings: Histogram,
+  discussions: ChatDotRound,
+  teams: UserFilled,
+  about: InfoFilled,
+  settings: Setting,
+  arrow: ArrowRight,
+  refresh: Refresh,
+  search: Search,
+  monitor: Monitor,
+  bell: Bell,
+  down: ArrowDown,
+  reading: Reading,
+  document: Document,
+  clock: Clock,
+  connection: Connection,
+  folder: FolderOpened,
+}
+const icon = computed(() => icons[props.name as keyof typeof icons] ?? Document)
+</script>
+<template>
+  <el-icon aria-hidden="true"><component :is="icon" /></el-icon>
+</template>
diff --git a/frontend/src/components/VerdictTag.vue b/frontend/src/components/VerdictTag.vue
new file mode 100644
index 0000000..007b149
--- /dev/null
+++ b/frontend/src/components/VerdictTag.vue
@@ -0,0 +1,9 @@
+<script setup lang="ts">
+import { verdictLabels, type Verdict } from '../data/preview'
+defineProps<{ value: Verdict; full?: boolean }>()
+</script>
+<template>
+  <span class="verdict" :class="`verdict-${value.toLowerCase()}`">{{
+    full ? verdictLabels[value] : value === 'Pending' ? '等待评测' : value
+  }}</span>
+</template>
diff --git a/frontend/src/composables/useCodeDraft.ts b/frontend/src/composables/useCodeDraft.ts
new file mode 100644
index 0000000..f1c17c7
--- /dev/null
+++ b/frontend/src/composables/useCodeDraft.ts
@@ -0,0 +1,88 @@
+import { computed, onScopeDispose, ref, watch } from 'vue'
+export type Language = 'cpp' | 'python' | 'rust'
+export const languageLabels: Record<Language, string> = {
+  cpp: 'C++',
+  python: 'Python',
+  rust: 'Rust',
+}
+export const codeTemplates: Record<Language, string> = {
+  cpp: '#include <iostream>\nusing namespace std;\n\nint main() {\n    // 在这里编写你的解法\n    return 0;\n}\n',
+  python: '# 在这里编写你的解法\n\n',
+  rust: 'use std::io::{self, Read};\n\nfn main() {\n    let mut input = String::new();\n    io::stdin().read_to_string(&mut input).unwrap();\n    // 在这里编写你的解法\n}\n',
+}
+export function useCodeDraft(problemId: string) {
+  const key = 'kf-oj:code-draft:' + problemId
+  const language = ref<Language>('cpp')
+  const drafts = ref({ ...codeTemplates })
+  const state = ref<'initial' | 'saved' | 'changed' | 'unavailable'>('initial')
+  let timer: ReturnType<typeof setTimeout> | undefined
+  try {
+    const raw = localStorage.getItem(key)
+    if (raw) {
+      const saved: unknown = JSON.parse(raw)
+      if (
+        saved &&
+        typeof saved === 'object' &&
+        'version' in saved &&
+        saved.version === 1 &&
+        'drafts' in saved &&
+        saved.drafts &&
+        typeof saved.drafts === 'object'
+      ) {
+        const storedDrafts = saved.drafts as Record<string, unknown>
+        for (const lang of ['cpp', 'python', 'rust'] as const) {
+          const value = storedDrafts[lang]
+          if (typeof value === 'string') drafts.value[lang] = value
+        }
+        if ('language' in saved && ['cpp', 'python', 'rust'].includes(String(saved.language)))
+          language.value = saved.language as Language
+        state.value = 'saved'
+      }
+    }
+  } catch {
+    state.value = 'unavailable'
+  }
+  const code = computed({
+    get: () => drafts.value[language.value],
+    set: (value) => {
+      drafts.value[language.value] = value
+    },
+  })
+  function save() {
+    clearTimeout(timer)
+    try {
+      localStorage.setItem(
+        key,
+        JSON.stringify({ version: 1, language: language.value, drafts: drafts.value }),
+      )
+      state.value = 'saved'
+    } catch {
+      state.value = 'unavailable'
+    }
+  }
+  watch(
+    [drafts, language],
+    () => {
+      state.value = 'changed'
+      clearTimeout(timer)
+      timer = setTimeout(save, 400)
+    },
+    // Mark pending changes before a lifecycle event can run in the same tick.
+    { deep: true, flush: 'sync' },
+  )
+  function flushPendingDraft() {
+    if (state.value === 'changed') save()
+  }
+  function onVisibilityChange() {
+    if (document.visibilityState === 'hidden') flushPendingDraft()
+  }
+  window.addEventListener('pagehide', flushPendingDraft)
+  document.addEventListener('visibilitychange', onVisibilityChange)
+  onScopeDispose(() => {
+    flushPendingDraft()
+    clearTimeout(timer)
+    window.removeEventListener('pagehide', flushPendingDraft)
+    document.removeEventListener('visibilitychange', onVisibilityChange)
+  })
+  return { language, code, state, save }
+}
diff --git a/frontend/src/composables/usePagination.ts b/frontend/src/composables/usePagination.ts
new file mode 100644
index 0000000..6d15e13
--- /dev/null
+++ b/frontend/src/composables/usePagination.ts
@@ -0,0 +1,13 @@
+import { computed, ref, watch, type Ref } from 'vue'
+export function usePagination<T>(items: Readonly<Ref<T[]>>, initialSize = 10) {
+  const page = ref(1)
+  const pageSize = ref(initialSize)
+  const total = computed(() => items.value.length)
+  const paged = computed(() =>
+    items.value.slice((page.value - 1) * pageSize.value, page.value * pageSize.value),
+  )
+  watch([items, pageSize], () => {
+    page.value = 1
+  })
+  return { page, pageSize, total, paged }
+}
diff --git a/frontend/src/composables/usePlatformHealth.ts b/frontend/src/composables/usePlatformHealth.ts
new file mode 100644
index 0000000..ffaa31e
--- /dev/null
+++ b/frontend/src/composables/usePlatformHealth.ts
@@ -0,0 +1,28 @@
+import { onMounted, onScopeDispose, ref } from 'vue'
+import { fetchLiveness } from '../api/health'
+
+export function usePlatformHealth() {
+  const state = ref<'loading' | 'connected' | 'unavailable'>('loading')
+  const version = ref('')
+  let controller: AbortController | undefined
+
+  async function refresh() {
+    controller?.abort()
+    const request = new AbortController()
+    controller = request
+    state.value = 'loading'
+    try {
+      const health = await fetchLiveness(request.signal)
+      if (!request.signal.aborted) {
+        version.value = health.version
+        state.value = 'connected'
+      }
+    } catch {
+      if (!request.signal.aborted) state.value = 'unavailable'
+    }
+  }
+
+  onMounted(refresh)
+  onScopeDispose(() => controller?.abort())
+  return { state, version, refresh }
+}
diff --git a/frontend/src/data/preview.ts b/frontend/src/data/preview.ts
new file mode 100644
index 0000000..d0b0496
--- /dev/null
+++ b/frontend/src/data/preview.ts
@@ -0,0 +1,465 @@
+// Explicit UI fixtures; business endpoints will be connected through API composables.
+export type Difficulty = '入门' | '简单' | '中等' | '困难'
+export interface Problem {
+  id: string
+  title: string
+  difficulty: Difficulty
+  tags: string[]
+  accepted: number
+  submissions: number
+  updated: string
+  description: string
+  input: string
+  output: string
+  sampleInput: string
+  sampleOutput: string
+  constraint: string
+}
+const definitions: [string, string, Difficulty, string[], number, number][] = [
+  ['1001', 'A + B Problem', '入门', ['模拟', '输入输出'], 428, 536],
+  ['1002', '两数之和', '简单', ['数组', '哈希表'], 315, 482],
+  ['1003', '最长无重复子串', '中等', ['字符串', '滑动窗口'], 206, 527],
+  ['1004', '旅行者的背包', '中等', ['动态规划', '背包'], 186, 461],
+  ['1005', '城市间的最短路径', '中等', ['图论', '最短路'], 152, 387],
+  ['1006', '寻找第一个位置', '简单', ['二分', '数组'], 241, 402],
+  ['1007', '括号匹配', '简单', ['栈', '字符串'], 287, 389],
+  ['1008', '岛屿的数量', '中等', ['搜索', '图论'], 143, 328],
+  ['1009', '区间求和', '中等', ['数据结构', '前缀和'], 124, 306],
+  ['1010', '最小生成树', '困难', ['图论', '并查集'], 96, 288],
+  ['1011', '活动安排', '简单', ['贪心', '排序'], 203, 312],
+  ['1012', '最长公共子序列', '中等', ['动态规划', '字符串'], 112, 345],
+]
+export const problems: Problem[] = definitions.map(
+  ([id, title, difficulty, tags, accepted, submissions], index) => ({
+    id,
+    title,
+    difficulty,
+    tags,
+    accepted,
+    submissions,
+    updated: '2026-10-' + String(4 - Math.floor(index / 4)).padStart(2, '0'),
+    description:
+      id === '1001'
+        ? '给定两个整数 A 和 B，请计算它们的和。认真阅读输入和输出格式，完成你的第一次提交。'
+        : '这道题的完整题面将在题库接入后展示。当前提供列表与编辑器的界面预览。',
+    input:
+      id === '1001'
+        ? '输入一行，包含两个整数 A 和 B，以一个空格分隔。'
+        : '完整输入格式待题库接入。',
+    output: id === '1001' ? '输出一个整数，表示 A 与 B 的和。' : '完整输出格式待题库接入。',
+    sampleInput: id === '1001' ? '1 2' : '',
+    sampleOutput: id === '1001' ? '3' : '',
+    constraint:
+      id === '1001'
+        ? '−10⁹ ≤ A, B ≤ 10⁹。建议使用 64 位整数保存计算结果。'
+        : '数据范围待题库接入。',
+  }),
+)
+export const problemTags = [...new Set(problems.flatMap((problem) => problem.tags))]
+export const rankings = [
+  {
+    username: 'Ada',
+    motto: '每天进步一点点',
+    solved: 167,
+    submissions: 238,
+    rating: 1924,
+    color: '#6196ec',
+  },
+  {
+    username: 'Kronecker',
+    motto: '写下思路，再写代码。',
+    solved: 142,
+    submissions: 216,
+    rating: 1846,
+    color: '#6b70d6',
+  },
+  {
+    username: 'Sora',
+    motto: '今天也要 AC',
+    solved: 129,
+    submissions: 204,
+    rating: 1732,
+    color: '#3fb7a1',
+  },
+  {
+    username: 'Natsume',
+    motto: '慢慢来，比较快',
+    solved: 118,
+    submissions: 182,
+    rating: 1685,
+    color: '#e9a35d',
+  },
+  {
+    username: 'Lin',
+    motto: '保持好奇',
+    solved: 106,
+    submissions: 175,
+    rating: 1621,
+    color: '#dc82a4',
+  },
+  {
+    username: 'Mika',
+    motto: '从一道题开始',
+    solved: 98,
+    submissions: 153,
+    rating: 1594,
+    color: '#63a9c9',
+  },
+  {
+    username: 'Chen',
+    motto: 'Hello, algorithm',
+    solved: 92,
+    submissions: 151,
+    rating: 1540,
+    color: '#897cb7',
+  },
+  {
+    username: 'Yuki',
+    motto: '专注这一题',
+    solved: 87,
+    submissions: 144,
+    rating: 1506,
+    color: '#6aaa8a',
+  },
+  {
+    username: 'Joago',
+    motto: 'Thinking in code',
+    solved: 81,
+    submissions: 132,
+    rating: 1482,
+    color: '#bb9b67',
+  },
+  {
+    username: 'Hyperbola',
+    motto: '努力成为更好的自己',
+    solved: 74,
+    submissions: 128,
+    rating: 1428,
+    color: '#8095b9',
+  },
+]
+export const notices = [
+  {
+    id: '1',
+    title: '欢迎来到 KF OnlineJudge',
+    date: '2026-10-04',
+    category: '平台公告',
+    text: '从基础练习开始，记录每一次提交，让思路在代码里落地。当前页面使用示例内容。',
+  },
+  {
+    id: '2',
+    title: '新学期基础训练题单已更新',
+    date: '2026-10-03',
+    category: '训练',
+    text: '输入输出、数组、字符串和简单搜索，按顺序完成你的第一组算法练习。',
+  },
+  {
+    id: '3',
+    title: '周末练习赛 · 热身题单',
+    date: '2026-10-01',
+    category: '比赛',
+    text: '练习赛页面已准备好，实际比赛安排以平台发布的信息为准。',
+  },
+]
+export const trainings = [
+  {
+    id: 'basics',
+    title: '从零开始 · 编程基础',
+    category: '基础入门',
+    level: '入门',
+    description: '从输入输出到数组与字符串，熟悉在线评测的基本流程。',
+    ids: ['1001', '1002', '1006', '1007'],
+    color: 'blue',
+    icon: '01',
+  },
+  {
+    id: 'search',
+    title: '搜索与图论入门',
+    category: '算法专题',
+    level: '中等',
+    description: '理解遍历、连通性与路径，建立图论的基础解题思路。',
+    ids: ['1008', '1005', '1010'],
+    color: 'green',
+    icon: '02',
+  },
+  {
+    id: 'dp',
+    title: '动态规划 · 一步一步推出来',
+    category: '算法专题',
+    level: '中等',
+    description: '从状态定义开始，练习转移、边界和空间优化。',
+    ids: ['1004', '1012'],
+    color: 'violet',
+    icon: '03',
+  },
+  {
+    id: 'structures',
+    title: '常用数据结构练习',
+    category: '进阶练习',
+    level: '中等',
+    description: '通过具体问题理解哈希表、栈、前缀和与并查集。',
+    ids: ['1002', '1007', '1009', '1010'],
+    color: 'amber',
+    icon: '04',
+  },
+]
+export const contests = [
+  {
+    id: 'weekly-01',
+    title: 'KF 周末练习赛 #01',
+    type: 'ACM',
+    status: '即将开始',
+    start: '2026-10-10 14:00',
+    duration: '2 小时',
+    description: '五道由浅入深的算法题，给自己一个专注思考的下午。',
+    ids: ['1001', '1002', '1003', '1004', '1005'],
+  },
+  {
+    id: 'starter',
+    title: '新同学编程热身赛',
+    type: 'OI',
+    status: '即将开始',
+    start: '2026-10-12 19:00',
+    duration: '2 小时',
+    description: '面向刚开始学习程序设计的同学，练习输入输出与基本逻辑。',
+    ids: ['1001', '1006', '1007'],
+  },
+  {
+    id: 'graph',
+    title: '图论专题 · 路径与连通性',
+    type: 'ACM',
+    status: '进行中',
+    start: '2026-10-04 14:00',
+    duration: '4 小时',
+    description: '题单式比赛界面示例，状态与时间为展示用数据。',
+    ids: ['1005', '1008', '1010'],
+  },
+  {
+    id: 'weekly-00',
+    title: 'KF 周末练习赛 #00',
+    type: 'ACM',
+    status: '已结束',
+    start: '2026-09-27 14:00',
+    duration: '2 小时',
+    description: '往期比赛界面示例，便于浏览题目和比赛说明。',
+    ids: ['1001', '1003', '1011'],
+  },
+  {
+    id: 'dp-practice',
+    title: '动态规划专项练习',
+    type: 'OI',
+    status: '已结束',
+    start: '2026-09-20 09:00',
+    duration: '3 小时',
+    description: '集中练习常见动态规划模型。',
+    ids: ['1004', '1012'],
+  },
+]
+export type Verdict = 'AC' | 'WA' | 'TLE' | 'RE' | 'CE' | 'Pending'
+export const verdictLabels: Record<Verdict, string> = {
+  AC: 'Accepted',
+  WA: 'Wrong Answer',
+  TLE: 'Time Limit Exceeded',
+  RE: 'Runtime Error',
+  CE: 'Compile Error',
+  Pending: '等待评测',
+}
+export const submissions: {
+  id: string
+  problemId: string
+  username: string
+  verdict: Verdict
+  language: string
+  time: number | null
+  memory: number | null
+  created: string
+}[] = [
+  {
+    id: '10248',
+    problemId: '1001',
+    username: 'Kronecker',
+    verdict: 'AC',
+    language: 'Rust',
+    time: 12,
+    memory: 2048,
+    created: '2026-10-04 14:32:18',
+  },
+  {
+    id: '10247',
+    problemId: '1003',
+    username: 'Ada',
+    verdict: 'AC',
+    language: 'C++',
+    time: 34,
+    memory: 4096,
+    created: '2026-10-04 14:30:05',
+  },
+  {
+    id: '10246',
+    problemId: '1004',
+    username: 'Sora',
+    verdict: 'WA',
+    language: 'Python',
+    time: 62,
+    memory: 8192,
+    created: '2026-10-04 14:28:41',
+  },
+  {
+    id: '10245',
+    problemId: '1005',
+    username: 'Lin',
+    verdict: 'TLE',
+    language: 'C++',
+    time: 1000,
+    memory: 6144,
+    created: '2026-10-04 14:26:22',
+  },
+  {
+    id: '10244',
+    problemId: '1002',
+    username: 'Mika',
+    verdict: 'AC',
+    language: 'Python',
+    time: 48,
+    memory: 7168,
+    created: '2026-10-04 14:24:09',
+  },
+  {
+    id: '10243',
+    problemId: '1007',
+    username: 'Chen',
+    verdict: 'CE',
+    language: 'C++',
+    time: null,
+    memory: null,
+    created: '2026-10-04 14:21:33',
+  },
+  {
+    id: '10242',
+    problemId: '1008',
+    username: 'Yuki',
+    verdict: 'RE',
+    language: 'Rust',
+    time: 18,
+    memory: 3072,
+    created: '2026-10-04 14:19:06',
+  },
+  {
+    id: '10241',
+    problemId: '1006',
+    username: 'Kronecker',
+    verdict: 'AC',
+    language: 'Rust',
+    time: 11,
+    memory: 2048,
+    created: '2026-10-04 14:17:26',
+  },
+  {
+    id: '10240',
+    problemId: '1011',
+    username: 'Natsume',
+    verdict: 'Pending',
+    language: 'C++',
+    time: null,
+    memory: null,
+    created: '2026-10-04 14:15:12',
+  },
+  {
+    id: '10239',
+    problemId: '1009',
+    username: 'Ada',
+    verdict: 'AC',
+    language: 'C++',
+    time: 22,
+    memory: 4096,
+    created: '2026-10-04 14:12:45',
+  },
+  {
+    id: '10238',
+    problemId: '1002',
+    username: 'Sora',
+    verdict: 'WA',
+    language: 'Python',
+    time: 56,
+    memory: 7168,
+    created: '2026-10-04 14:10:18',
+  },
+  {
+    id: '10237',
+    problemId: '1012',
+    username: 'Hyperbola',
+    verdict: 'AC',
+    language: 'C++',
+    time: 71,
+    memory: 10240,
+    created: '2026-10-04 14:08:51',
+  },
+]
+export const discussions = [
+  {
+    id: '1',
+    title: '第一次使用在线评测，可以从哪里开始？',
+    category: '交流',
+    author: 'Kronecker',
+    replies: 12,
+    views: 328,
+    date: '2026-10-04',
+    pinned: true,
+    content:
+      '欢迎来到 KF OnlineJudge！可以先打开「从零开始 · 编程基础」题单，了解标准输入输出，再尝试 A + B Problem。\n\n遇到问题时，记录题号、语言和具体报错，把自己的思路一起写出来，讨论会更容易展开。',
+  },
+  {
+    id: '2',
+    title: 'A + B Problem：输入输出与整数范围',
+    category: '题解',
+    author: 'Ada',
+    replies: 8,
+    views: 216,
+    date: '2026-10-04',
+    pinned: false,
+    content:
+      '读取两个整数，计算它们的和，输出结果。\n\n记得检查整数范围。Rust 可以选择 i64；Python 的整数可以直接参与计算。输出只需要答案和换行。',
+    problemId: '1001',
+  },
+  {
+    id: '3',
+    title: '动态规划中的状态应该怎么定义？',
+    category: '问答',
+    author: 'Sora',
+    replies: 6,
+    views: 184,
+    date: '2026-10-03',
+    pinned: false,
+    content:
+      '练习背包问题时，我经常卡在状态定义上。现在尝试先描述「已经处理哪些物品」和「剩余多少容量」，再考虑每一步有哪些选择。\n\n大家平时会怎样从题意里提取状态？',
+  },
+  {
+    id: '4',
+    title: '分享我的 Rust 刷题输入模板',
+    category: '交流',
+    author: 'Lin',
+    replies: 4,
+    views: 152,
+    date: '2026-10-02',
+    pinned: false,
+    content:
+      '先用 read_to_string 获取输入，再按空白分隔。\n\n不同题目的输入结构可能不同，使用模板之前还是需要认真阅读题面。',
+  },
+  {
+    id: '5',
+    title: '关于题库筛选的一点建议',
+    category: '反馈',
+    author: 'Mika',
+    replies: 2,
+    views: 96,
+    date: '2026-10-01',
+    pinned: false,
+    content: '希望题库可以同时按照标签和难度筛选，这样练习某个知识点会更方便。',
+  },
+]
+export function findProblem(id: string) {
+  return problems.find((problem) => problem.id === id)
+}
+export function acceptance(problem: Pick<Problem, 'accepted' | 'submissions'>) {
+  return Math.round((problem.accepted / problem.submissions) * 100)
+}
diff --git a/frontend/src/env.d.ts b/frontend/src/env.d.ts
new file mode 100644
index 0000000..f614c5b
--- /dev/null
+++ b/frontend/src/env.d.ts
@@ -0,0 +1,2 @@
+/// <reference types="vite/client" />
+/// <reference types="element-plus/global" />
diff --git a/frontend/src/layouts/AppLayout.vue b/frontend/src/layouts/AppLayout.vue
new file mode 100644
index 0000000..851d43b
--- /dev/null
+++ b/frontend/src/layouts/AppLayout.vue
@@ -0,0 +1,94 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import UiIcon from '../components/UiIcon.vue'
+const route = useRoute()
+const mobileOpen = ref(false)
+const links = [
+  { to: '/', label: '首页', icon: 'home' },
+  { to: '/problems', label: '题库', icon: 'problems' },
+  { to: '/trainings', label: '训练', icon: 'trainings' },
+  { to: '/contests', label: '比赛', icon: 'contests' },
+  { to: '/submissions', label: '评测', icon: 'submissions' },
+  { to: '/rankings', label: '排名', icon: 'rankings' },
+  { to: '/discussions', label: '讨论', icon: 'discussions' },
+  { to: '/teams', label: '团队', icon: 'teams' },
+  { to: '/about', label: '关于', icon: 'about' },
+]
+const activePath = computed(() => '/' + route.path.split('/')[1])
+</script>
+<template>
+  <div class="app-shell">
+    <header class="app-header">
+      <div class="header-inner">
+        <RouterLink to="/" class="brand" aria-label="KF OnlineJudge 首页"
+          ><span class="brand-mark">KF<span class="brand-dot">.</span></span
+          ><span class="brand-name"
+            >OnlineJudge<small>CODE · PRACTICE · GROW</small></span
+          ></RouterLink
+        >
+        <button
+          class="mobile-toggle"
+          :aria-expanded="mobileOpen"
+          aria-controls="main-navigation"
+          @click="mobileOpen = !mobileOpen"
+        >
+          <UiIcon name="problems" /> 导航
+        </button>
+        <nav
+          id="main-navigation"
+          class="main-nav"
+          :class="{ 'mobile-open': mobileOpen }"
+          aria-label="主导航"
+        >
+          <RouterLink
+            v-for="link in links"
+            :key="link.to"
+            :to="link.to"
+            :class="{ active: activePath === link.to }"
+            @click="mobileOpen = false"
+            ><UiIcon :name="link.icon" />{{ link.label }}</RouterLink
+          >
+        </nav>
+        <div class="header-account">
+          <el-tooltip content="页面使用示例内容，业务服务逐步接入" placement="bottom"
+            ><span class="preview-label">界面预览</span></el-tooltip
+          ><RouterLink to="/login"
+            ><el-button type="primary" size="small" round>登录</el-button></RouterLink
+          ><RouterLink to="/register"><el-button size="small" round>注册</el-button></RouterLink>
+        </div>
+      </div>
+    </header>
+    <main id="main-content" class="app-main"><slot /></main>
+    <footer class="app-footer">
+      <div class="footer-inner">
+        <div class="footer-brand">
+          <span class="brand-mark">KF.</span><strong>每一次提交，都有新的收获。</strong>
+          <p>一个面向练习、竞赛与交流的在线评测平台。</p>
+        </div>
+        <div>
+          <h3>开始练习</h3>
+          <RouterLink to="/problems">浏览题库</RouterLink
+          ><RouterLink to="/trainings">专题训练</RouterLink
+          ><RouterLink to="/contests">参加比赛</RouterLink>
+        </div>
+        <div>
+          <h3>交流与成长</h3>
+          <RouterLink to="/discussions">讨论社区</RouterLink
+          ><RouterLink to="/rankings">过题排行榜</RouterLink
+          ><RouterLink to="/teams/create">创建团队</RouterLink>
+        </div>
+        <div>
+          <h3>平台</h3>
+          <RouterLink to="/about">关于 KF OnlineJudge</RouterLink
+          ><RouterLink to="/about#system">系统状态</RouterLink
+          ><a href="/admin/index.html">管理入口</a>
+        </div>
+      </div>
+      <div class="footer-bottom">
+        <span>© 2026 KF OnlineJudge</span><span>示例数据 · 备案信息待填写</span
+        ><span>编程 · 练习 · 成长</span>
+      </div>
+    </footer>
+  </div>
+</template>
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
new file mode 100644
index 0000000..4c9b9af
--- /dev/null
+++ b/frontend/src/main.ts
@@ -0,0 +1,11 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import { registerUi } from './plugins/ui'
+import App from './App.vue'
+import { router } from './router'
+import './styles/base.css'
+import './styles/blueprint.css'
+
+const app = createApp(App)
+registerUi(app)
+app.use(createPinia()).use(router).mount('#app')
diff --git a/frontend/src/plugins/ui.ts b/frontend/src/plugins/ui.ts
new file mode 100644
index 0000000..72fb75a
--- /dev/null
+++ b/frontend/src/plugins/ui.ts
@@ -0,0 +1,65 @@
+import type { App } from 'vue'
+import {
+  ElButton,
+  ElConfigProvider,
+  ElDescriptions,
+  ElDescriptionsItem,
+  ElDialog,
+  ElEmpty,
+  ElForm,
+  ElFormItem,
+  ElIcon,
+  ElInput,
+  ElOption,
+  ElPagination,
+  ElPopover,
+  ElProgress,
+  ElRadio,
+  ElRadioButton,
+  ElRadioGroup,
+  ElResult,
+  ElSelect,
+  ElSlider,
+  ElSwitch,
+  ElTabPane,
+  ElTable,
+  ElTableColumn,
+  ElTabs,
+  ElTag,
+  ElTooltip,
+} from 'element-plus'
+import 'element-plus/dist/index.css'
+
+export function registerUi(app: App) {
+  for (const component of [
+    ElButton,
+    ElConfigProvider,
+    ElDescriptions,
+    ElDescriptionsItem,
+    ElDialog,
+    ElEmpty,
+    ElForm,
+    ElFormItem,
+    ElIcon,
+    ElInput,
+    ElOption,
+    ElPagination,
+    ElPopover,
+    ElProgress,
+    ElRadio,
+    ElRadioButton,
+    ElRadioGroup,
+    ElResult,
+    ElSelect,
+    ElSlider,
+    ElSwitch,
+    ElTabPane,
+    ElTable,
+    ElTableColumn,
+    ElTabs,
+    ElTag,
+    ElTooltip,
+  ]) {
+    app.use(component)
+  }
+}
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
new file mode 100644
index 0000000..b9da1e3
--- /dev/null
+++ b/frontend/src/router/index.ts
@@ -0,0 +1,100 @@
+import { createRouter, createWebHistory } from 'vue-router'
+export const router = createRouter({
+  history: createWebHistory(),
+  scrollBehavior: (to, _from, saved) => saved ?? (to.hash ? { el: to.hash } : { top: 0 }),
+  routes: [
+    {
+      path: '/',
+      name: 'home',
+      meta: { title: '首页' },
+      component: () => import('../views/HomeView.vue'),
+    },
+    {
+      path: '/problems',
+      meta: { title: '题库' },
+      component: () => import('../views/ProblemsView.vue'),
+    },
+    {
+      path: '/problems/:id',
+      meta: { title: '题目详情' },
+      component: () => import('../views/ProblemDetailView.vue'),
+    },
+    {
+      path: '/trainings',
+      meta: { title: '训练' },
+      component: () => import('../views/TrainingsView.vue'),
+    },
+    {
+      path: '/trainings/:id',
+      meta: { title: '训练详情' },
+      component: () => import('../views/TrainingDetailView.vue'),
+    },
+    {
+      path: '/contests',
+      meta: { title: '比赛' },
+      component: () => import('../views/ContestsView.vue'),
+    },
+    {
+      path: '/contests/:id',
+      meta: { title: '比赛详情' },
+      component: () => import('../views/ContestDetailView.vue'),
+    },
+    {
+      path: '/submissions',
+      meta: { title: '评测' },
+      component: () => import('../views/SubmissionsView.vue'),
+    },
+    {
+      path: '/submissions/:id',
+      meta: { title: '评测详情' },
+      component: () => import('../views/SubmissionDetailView.vue'),
+    },
+    {
+      path: '/rankings',
+      meta: { title: '排名' },
+      component: () => import('../views/RankingsView.vue'),
+    },
+    {
+      path: '/discussions',
+      meta: { title: '讨论' },
+      component: () => import('../views/DiscussionsView.vue'),
+    },
+    {
+      path: '/discussions/:id',
+      meta: { title: '讨论详情' },
+      component: () => import('../views/DiscussionDetailView.vue'),
+    },
+    { path: '/teams', meta: { title: '团队' }, component: () => import('../views/TeamsView.vue') },
+    {
+      path: '/teams/create',
+      meta: { title: '创建团队' },
+      component: () => import('../views/CreateTeamView.vue'),
+    },
+    {
+      path: '/users/:username',
+      meta: { title: '个人主页' },
+      component: () => import('../views/ProfileView.vue'),
+    },
+    { path: '/login', meta: { title: '登录' }, component: () => import('../views/AuthView.vue') },
+    {
+      path: '/register',
+      meta: { title: '注册' },
+      component: () => import('../views/AuthView.vue'),
+    },
+    {
+      path: '/logout',
+      meta: { title: '退出登录' },
+      component: () => import('../views/LogoutView.vue'),
+    },
+    { path: '/about', meta: { title: '关于' }, component: () => import('../views/AboutView.vue') },
+    {
+      path: '/:pathMatch(.*)*',
+      name: 'not-found',
+      meta: { title: '页面不存在' },
+      component: () => import('../views/NotFoundView.vue'),
+    },
+  ],
+})
+router.afterEach((to) => {
+  document.title = `${String(to.meta.title ?? '首页')} · KF OnlineJudge`
+})
diff --git a/frontend/src/styles/base.css b/frontend/src/styles/base.css
new file mode 100644
index 0000000..1b02049
--- /dev/null
+++ b/frontend/src/styles/base.css
@@ -0,0 +1,1436 @@
+:root {
+  font-family: Inter, 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
+  color: #354257;
+  background: #f0f3f7;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  --el-color-primary: #409eff;
+  --el-border-radius-base: 5px;
+  --el-border-color: #e0e6ee;
+  --el-text-color-primary: #354257;
+  --el-text-color-regular: #566379;
+  --el-fill-color-lighter: #f8fafc;
+  --blue: #409eff;
+  --muted: #8490a3;
+  --line: #edf0f5;
+}
+* {
+  box-sizing: border-box;
+}
+body {
+  margin: 0;
+}
+a {
+  color: inherit;
+  text-decoration: none;
+}
+a:hover {
+  color: var(--blue);
+}
+button,
+input,
+textarea {
+  font: inherit;
+}
+button {
+  cursor: pointer;
+}
+button:disabled {
+  cursor: not-allowed;
+}
+h1,
+h2,
+h3,
+p {
+  margin: 0;
+}
+p {
+  line-height: 1.75;
+}
+::selection {
+  background: #daecff;
+}
+.app-shell {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+}
+.app-header {
+  background: #fff;
+  border-bottom: 1px solid #e5eaf1;
+  box-shadow: 0 2px 5px #263c5605;
+}
+.header-inner {
+  width: min(100% - 48px, 1480px);
+  margin: auto;
+  display: flex;
+  align-items: center;
+  min-height: 68px;
+  gap: 28px;
+}
+.brand {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  white-space: nowrap;
+}
+.brand-mark {
+  font-size: 29px;
+  letter-spacing: -2px;
+  font-weight: 850;
+  color: #409eff;
+  line-height: 1;
+}
+.brand-dot {
+  color: #91bff3;
+}
+.brand-name {
+  font-size: 15px;
+  font-weight: 750;
+  color: #2d4261;
+  letter-spacing: -0.3px;
+}
+.brand-name small {
+  display: block;
+  font-size: 8px;
+  letter-spacing: 1px;
+  color: #91a3bb;
+  margin-top: 4px;
+}
+.main-nav {
+  display: flex;
+  align-self: stretch;
+  gap: 3px;
+}
+.main-nav a {
+  display: flex;
+  align-items: center;
+  gap: 7px;
+  padding: 0 13px;
+  font-size: 13px;
+  border-bottom: 2px solid transparent;
+  white-space: nowrap;
+  color: #67758a;
+}
+.main-nav a.active {
+  color: var(--blue);
+  background: #f4f9ff;
+  border-color: var(--blue);
+}
+.main-nav .el-icon {
+  font-size: 14px;
+}
+.header-account {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-left: auto;
+  white-space: nowrap;
+}
+.preview-label {
+  font-size: 11px;
+  color: #91a0b2;
+  margin-right: 6px;
+}
+.mobile-toggle {
+  display: none;
+}
+.app-main {
+  width: min(100% - 48px, 1480px);
+  margin: 24px auto 40px;
+  flex: 1;
+}
+.app-footer {
+  background: #fff;
+  border-top: 1px solid #e6ecf3;
+  padding: 36px 0 20px;
+}
+.footer-inner,
+.footer-bottom {
+  width: min(100% - 64px, 1400px);
+  margin: auto;
+  display: grid;
+  grid-template-columns: 2fr 1fr 1fr 1fr;
+  gap: 32px;
+}
+.footer-brand strong {
+  display: block;
+  margin: 15px 0 7px;
+  font-size: 14px;
+  font-weight: 500;
+}
+.footer-brand p {
+  font-size: 12px;
+  color: var(--muted);
+}
+.footer-inner h3 {
+  font-size: 13px;
+  font-weight: 600;
+  margin: 2px 0 12px;
+}
+.footer-inner a {
+  display: block;
+  font-size: 12px;
+  color: #8490a3;
+  margin: 10px 0;
+}
+.footer-inner a:hover {
+  color: var(--blue);
+}
+.footer-bottom {
+  display: flex;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  border-top: 1px solid var(--line);
+  padding-top: 20px;
+  margin-top: 30px;
+  font-size: 11px;
+  color: #9aa5b5;
+}
+.panel {
+  background: #fff;
+  border: 1px solid #e8edf4;
+  border-radius: 6px;
+  box-shadow: 0 2px 7px #263c5605;
+  min-width: 0;
+  overflow: hidden;
+}
+.panel-heading {
+  min-height: 54px;
+  padding: 15px 20px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  border-bottom: 1px solid var(--line);
+}
+.panel-heading h2 {
+  font-size: 15px;
+  color: #4995e5;
+  font-weight: 600;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+.panel-heading small {
+  font-size: 11px;
+  font-weight: 400;
+  color: #98a4b4;
+  margin-left: 4px;
+}
+.panel-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 12px;
+  color: var(--muted);
+  flex-shrink: 0;
+}
+.panel-actions a {
+  color: var(--blue);
+}
+.panel-body {
+  padding: 20px;
+  min-width: 0;
+}
+.page-heading {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 20px;
+  margin: 8px 0 24px;
+}
+.page-heading h1 {
+  font-size: 26px;
+  font-weight: 650;
+  letter-spacing: -0.6px;
+  margin-bottom: 8px;
+  color: #2e405b;
+}
+.page-heading p {
+  font-size: 13px;
+}
+.page-heading-actions {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.eyebrow {
+  text-transform: uppercase;
+  font-size: 11px !important;
+  letter-spacing: 2px;
+  color: #86a0be;
+  margin-bottom: 8px;
+}
+.muted {
+  color: var(--muted);
+}
+.small {
+  font-size: 12px;
+}
+.mono {
+  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
+}
+.tabular {
+  font-variant-numeric: tabular-nums;
+}
+.text-link {
+  color: var(--blue);
+  font-size: 13px;
+}
+.table-link {
+  color: #455e80;
+  font-weight: 500;
+}
+.table-link:hover {
+  color: var(--blue);
+}
+.tag-list {
+  display: flex;
+  gap: 5px;
+  flex-wrap: wrap;
+}
+.tag {
+  display: inline-flex;
+  align-items: center;
+  padding: 3px 7px;
+  color: #8492a6;
+  background: #f3f6fa;
+  border-radius: 3px;
+  font-size: 11px;
+  white-space: nowrap;
+}
+.difficulty {
+  padding: 3px 7px;
+  border-radius: 4px;
+  font-size: 11px;
+  white-space: nowrap;
+  background: #f0f3f7;
+  color: #8a99ac;
+}
+.difficulty-easy {
+  color: #49a389;
+  background: #eff9f5;
+}
+.difficulty-medium {
+  color: #c28e37;
+  background: #fff7e8;
+}
+.difficulty-hard {
+  color: #c86c85;
+  background: #fff0f4;
+}
+.verdict {
+  font:
+    600 11px ui-monospace,
+    monospace;
+  padding: 4px 8px;
+  border-radius: 4px;
+  white-space: nowrap;
+}
+.verdict-ac {
+  color: #22a278;
+  background: #edf9f4;
+}
+.verdict-wa,
+.verdict-re {
+  color: #dd7184;
+  background: #fff0f3;
+}
+.verdict-tle {
+  color: #c39737;
+  background: #fff8e7;
+}
+.verdict-ce {
+  color: #9879cc;
+  background: #f6f0fc;
+}
+.verdict-pending {
+  color: #8897ac;
+  background: #f0f4f9;
+}
+.filters {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: center;
+  margin-bottom: 22px;
+}
+.filters .el-input {
+  width: 260px;
+}
+.filters .el-select {
+  width: 155px;
+}
+.filter-label {
+  font-size: 12px;
+  color: #8a99ad;
+}
+.pagination-row {
+  padding: 20px 0 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  font-size: 12px;
+  color: var(--muted);
+}
+.el-table {
+  --el-table-header-bg-color: #f8fafc;
+  --el-table-header-text-color: #7e8a9c;
+  --el-table-border-color: #edf0f5;
+  font-size: 12px;
+}
+.el-table th.el-table__cell {
+  font-weight: 500;
+}
+.el-table .el-table__cell {
+  padding: 12px 0;
+}
+.stack {
+  display: flex;
+  flex-direction: column;
+  gap: 20px;
+  min-width: 0;
+}
+.content-with-aside {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 320px;
+  gap: 20px;
+}
+.summary-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 16px;
+  margin-bottom: 20px;
+}
+.summary-card {
+  background: #fff;
+  border: 1px solid #e8edf4;
+  border-radius: 6px;
+  padding: 20px;
+}
+.summary-card p {
+  font-size: 12px;
+  color: var(--muted);
+}
+.summary-card strong {
+  display: block;
+  font-size: 27px;
+  font-weight: 600;
+  margin: 8px 0 2px;
+  letter-spacing: -0.5px;
+}
+.summary-card small {
+  font-size: 11px;
+  color: #9cabbc;
+}
+.avatar {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 30px;
+  height: 30px;
+  border-radius: 50%;
+  color: #fff;
+  font-size: 12px;
+  flex-shrink: 0;
+}
+.user-inline {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.number-medal {
+  display: inline-grid;
+  place-items: center;
+  width: 21px;
+  height: 25px;
+  color: #9aa5b5;
+  font-weight: 600;
+  font-size: 12px;
+}
+.number-medal.top-1 {
+  color: #e3983e;
+  background: #fff3df;
+}
+.number-medal.top-2 {
+  color: #8498b7;
+  background: #edf2f9;
+}
+.number-medal.top-3 {
+  color: #c58d74;
+  background: #f9efe8;
+}
+.empty-state {
+  text-align: center;
+  padding: 12px 0 24px;
+}
+.empty-state .el-empty {
+  padding: 20px;
+}
+.empty-state > p {
+  font-size: 13px;
+  margin-bottom: 14px;
+}
+.breadcrumbs {
+  margin: 0 0 20px;
+  font-size: 12px;
+  color: #95a1b1;
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+}
+.breadcrumbs a {
+  color: #7299c2;
+}
+.intro-banner {
+  background: linear-gradient(115deg, #eaf4ff, #f5f8fd);
+  border: 1px solid #e2edfa;
+  border-radius: 6px;
+  padding: 30px;
+  margin-bottom: 24px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 24px;
+}
+.intro-banner h2 {
+  font-size: 25px;
+  margin: 8px 0 12px;
+  font-weight: 600;
+}
+.intro-banner p {
+  font-size: 13px;
+  color: #7a8eaa;
+  max-width: 540px;
+}
+.intro-number {
+  font-size: 65px;
+  color: #afceef;
+  font-family: Georgia, serif;
+}
+.card-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 20px;
+}
+.training-card {
+  padding: 26px;
+  background: #fff;
+  border: 1px solid #e8edf4;
+  border-radius: 6px;
+  display: flex;
+  gap: 22px;
+}
+.training-illustration {
+  width: 70px;
+  height: 78px;
+  border-radius: 12px;
+  display: grid;
+  place-items: center;
+  flex-shrink: 0;
+  font:
+    600 27px ui-monospace,
+    monospace;
+  background: #ecf4ff;
+  color: #81b2ea;
+}
+.training-illustration.green {
+  background: #edf8f3;
+  color: #73b39f;
+}
+.training-illustration.violet {
+  background: #f3effb;
+  color: #a291cc;
+}
+.training-illustration.amber {
+  background: #fff7ea;
+  color: #d6b072;
+}
+.training-card h2 {
+  font-size: 17px;
+  margin: 10px 0;
+  color: #425874;
+}
+.training-card p {
+  font-size: 12px;
+  color: #92a0b2;
+  margin: 9px 0 18px;
+}
+.card-meta {
+  display: flex;
+  align-items: center;
+  gap: 15px;
+  font-size: 12px;
+  color: #92a0b2;
+}
+.card-meta .text-link {
+  margin-left: auto;
+}
+.detail-prose {
+  font-size: 14px;
+  line-height: 1.9;
+  color: #566379;
+}
+.detail-prose h2 {
+  font-size: 17px;
+  color: #40536d;
+  margin: 24px 0 10px;
+  font-weight: 600;
+}
+.detail-prose h2:first-child {
+  margin-top: 0;
+}
+.detail-prose p {
+  white-space: pre-line;
+}
+.sample-block {
+  background: #f7f9fc;
+  border: 1px solid #e9eef5;
+  border-radius: 5px;
+  padding: 16px;
+  font:
+    13px/1.8 ui-monospace,
+    monospace;
+  white-space: pre-wrap;
+  margin: 12px 0;
+}
+.detail-meta {
+  display: flex;
+  align-items: center;
+  gap: 18px;
+  flex-wrap: wrap;
+  font-size: 12px;
+  color: #92a0b2;
+  margin: 14px 0 20px;
+}
+.details-list {
+  display: flex;
+  flex-direction: column;
+  gap: 15px;
+  font-size: 13px;
+}
+.details-list div {
+  display: flex;
+  justify-content: space-between;
+  gap: 20px;
+}
+.details-list dt {
+  color: #91a0b2;
+}
+.details-list dd {
+  margin: 0;
+  text-align: right;
+}
+.notice-strip {
+  padding: 12px 16px;
+  background: #f5f9ff;
+  border: 1px solid #e6f0fc;
+  border-radius: 5px;
+  font-size: 12px;
+  color: #7b94b2;
+  margin-bottom: 20px;
+  line-height: 1.7;
+}
+.form-panel {
+  max-width: 860px;
+  margin: auto;
+}
+.form-panel .panel-body {
+  padding: 32px;
+}
+.form-help {
+  font-size: 12px;
+  color: #98a5b6;
+  margin: 5px 0 0;
+}
+.form-actions {
+  display: flex;
+  gap: 12px;
+  align-items: center;
+  margin-top: 28px;
+}
+.form-actions .muted {
+  font-size: 12px;
+}
+.tab-summary {
+  padding: 16px 0;
+  font-size: 13px;
+  color: var(--muted);
+}
+.about-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 18px;
+}
+.about-feature {
+  padding: 24px;
+  border: 1px solid #edf0f5;
+  border-radius: 6px;
+}
+.about-feature h3 {
+  font-size: 16px;
+  margin: 12px 0;
+}
+.about-feature p {
+  font-size: 13px;
+  color: #8c9db2;
+}
+.about-feature .el-icon {
+  font-size: 23px;
+  color: #7cacde;
+}
+.service-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 20px;
+}
+.service-row h3 {
+  font-size: 15px;
+  margin-bottom: 8px;
+}
+.service-row p {
+  font-size: 12px;
+  color: #94a2b6;
+}
+.profile-banner {
+  background: #fff;
+  border: 1px solid #e8edf4;
+  border-radius: 6px;
+  padding: 36px;
+  display: flex;
+  align-items: center;
+  gap: 25px;
+  margin-bottom: 22px;
+}
+.profile-banner > .avatar {
+  width: 84px;
+  height: 84px;
+  font-size: 32px;
+}
+.profile-banner h1 {
+  font-size: 27px;
+  margin-bottom: 8px;
+}
+.profile-banner p {
+  color: #92a0b2;
+  font-size: 13px;
+}
+.profile-actions {
+  margin-left: auto;
+  display: flex;
+  gap: 10px;
+}
+.profile-tags {
+  margin-top: 12px;
+  display: flex;
+  gap: 7px;
+}
+.heatmap {
+  display: grid;
+  grid-template-columns: repeat(20, minmax(0, 1fr));
+  gap: 5px;
+  padding: 15px 0;
+}
+.heat-cell {
+  aspect-ratio: 1;
+  border-radius: 3px;
+  background: #edf3fa;
+}
+.heat-cell[data-level='1'] {
+  background: #d6eaff;
+}
+.heat-cell[data-level='2'] {
+  background: #a3d1fc;
+}
+.heat-cell[data-level='3'] {
+  background: #6caff0;
+}
+.heat-cell[data-level='4'] {
+  background: #4094e4;
+}
+.skill-row {
+  margin: 17px 0;
+}
+.skill-row > div {
+  display: flex;
+  justify-content: space-between;
+  font-size: 12px;
+  margin-bottom: 8px;
+}
+.admin-shell {
+  display: grid;
+  grid-template-columns: 210px minmax(0, 1fr);
+  gap: 22px;
+}
+.admin-sidebar {
+  padding: 20px 12px;
+  align-self: start;
+}
+.admin-sidebar h2 {
+  font-size: 14px;
+  padding: 0 12px;
+  margin-bottom: 18px;
+}
+.admin-sidebar a {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 12px;
+  border-radius: 5px;
+  font-size: 13px;
+  color: #7b8da5;
+}
+.admin-sidebar a.active {
+  background: #eef6ff;
+  color: #409eff;
+}
+.admin-notice {
+  font-size: 12px;
+  color: #8fa0b6;
+  padding: 18px 12px 0;
+  border-top: 1px solid #edf0f5;
+  margin-top: 20px;
+  line-height: 1.7;
+}
+.status-dot {
+  display: inline-block;
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: #80b69a;
+  margin-right: 6px;
+}
+.status-dot.offline {
+  background: #c5cedb;
+}
+.home-grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1.75fr) minmax(320px, 1fr);
+  gap: 20px;
+}
+.home-banner .panel-body {
+  padding: 16px;
+}
+.hero-image {
+  position: relative;
+  min-height: 300px;
+  overflow: hidden;
+  border-radius: 4px;
+  background: #e6f2ff;
+  isolation: isolate;
+}
+.hero-image > img {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  inset: 0;
+  z-index: -1;
+}
+.hero-copy {
+  position: relative;
+  padding: 42px 36px;
+  max-width: 75%;
+}
+.hero-copy .eyebrow {
+  font-size: 10px !important;
+  color: #6b96c6;
+}
+.hero-copy h1 {
+  font-size: clamp(25px, 2.35vw, 38px);
+  font-weight: 600;
+  line-height: 1.4;
+  color: #335983;
+  letter-spacing: -1px;
+  margin: 12px 0;
+}
+.hero-copy p {
+  font-size: 13px;
+  color: #7093b7;
+  max-width: 320px;
+  margin-bottom: 23px;
+}
+.hero-controls {
+  display: flex;
+  justify-content: center;
+  gap: 7px;
+  padding: 12px 0 1px;
+}
+.hero-controls button {
+  width: 20px;
+  height: 3px;
+  padding: 0;
+  border: 0;
+  background: #d9e3ee;
+  border-radius: 2px;
+}
+.hero-controls button.active {
+  background: #409eff;
+}
+.home-rank .panel-body {
+  padding: 10px 20px;
+}
+.home-rank .el-table .el-table__cell {
+  padding: 8px 0;
+}
+.home-rank .avatar {
+  width: 23px;
+  height: 23px;
+  font-size: 10px;
+}
+.home-rank .number-medal {
+  height: 21px;
+  font-size: 11px;
+}
+.home-notice {
+  padding: 15px 4px;
+  display: flex;
+  gap: 15px;
+  border-bottom: 1px solid #edf0f5;
+}
+.home-notice:last-child {
+  border: 0;
+  padding-bottom: 2px;
+}
+.home-notice > div {
+  min-width: 0;
+}
+.home-notice-title {
+  display: block;
+  font-size: 13px;
+  margin: 0 0 5px;
+  font-weight: 500;
+  color: #4c6685;
+}
+.home-notice p {
+  font-size: 12px;
+  color: #98a5b7;
+}
+.home-notice time {
+  font-size: 11px;
+  color: #a0adbc;
+  white-space: nowrap;
+  margin-left: auto;
+}
+.notice-symbol {
+  background: #edf6ff;
+  width: 28px;
+  height: 28px;
+  border-radius: 5px;
+  display: grid;
+  place-items: center;
+  color: #66a8eb;
+  flex-shrink: 0;
+}
+.contest-mini {
+  display: flex;
+  gap: 11px;
+  padding: 13px 0;
+  border-bottom: 1px solid #edf0f5;
+  align-items: center;
+}
+.contest-mini:last-child {
+  border-bottom: 0;
+}
+.contest-mini strong {
+  display: block;
+  font-size: 12px;
+  color: #59708d;
+  font-weight: 500;
+}
+.contest-mini p {
+  font-size: 11px;
+  color: #9cacbf;
+  margin-top: 4px;
+}
+.contest-format {
+  font-size: 10px;
+  background: #eaf5ff;
+  color: #68a3de;
+  border-radius: 3px;
+  min-width: 31px;
+  text-align: center;
+  padding: 4px;
+}
+.contest-format.oi {
+  background: #eaf8f1;
+  color: #64b296;
+}
+.contest-status {
+  margin-left: auto;
+  font-size: 11px;
+  color: #cfad76;
+  white-space: nowrap;
+}
+.home-quick {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 10px;
+}
+.home-quick a {
+  padding: 14px;
+  background: #f8fafc;
+  border: 1px solid #edf2f7;
+  border-radius: 5px;
+  font-size: 12px;
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  color: #7b94b4;
+}
+.home-quick a:hover {
+  background: #eff6ff;
+  color: #409eff;
+}
+.auth-shell {
+  max-width: 1000px;
+  margin: 35px auto;
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  min-height: 540px;
+  background: #fff;
+  border: 1px solid #e5ecf4;
+  border-radius: 8px;
+  overflow: hidden;
+}
+.auth-art {
+  padding: 48px 40px;
+  background: #e9f3ff url('/images/home-banner.svg') center bottom/cover;
+}
+.auth-art h1 {
+  font-size: 33px;
+  color: #4f78a4;
+  margin: 35px 0 15px;
+}
+.auth-art p {
+  font-size: 14px;
+  color: #86a4c5;
+}
+.auth-form {
+  padding: 40px;
+}
+.auth-form h2 {
+  font-size: 25px;
+  margin-bottom: 8px;
+}
+.auth-form > p {
+  font-size: 12px;
+  color: #9caabc;
+  margin-bottom: 25px;
+}
+.auth-form .el-form-item {
+  margin-bottom: 21px;
+}
+.auth-form .el-button {
+  width: 100%;
+}
+.auth-links {
+  font-size: 12px;
+  display: flex;
+  justify-content: space-between;
+  margin-top: 20px;
+  color: #91a2b8;
+}
+.discussion-item {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  padding: 23px 0;
+  border-bottom: 1px solid #edf0f5;
+}
+.discussion-item:last-child {
+  border-bottom: 0;
+}
+.discussion-item .avatar {
+  width: 40px;
+  height: 40px;
+  font-size: 16px;
+}
+.discussion-item h2 {
+  font-size: 15px;
+  font-weight: 500;
+  margin-bottom: 7px;
+  display: flex;
+  gap: 8px;
+  align-items: center;
+  flex-wrap: wrap;
+}
+.discussion-item p {
+  display: flex;
+  gap: 12px;
+  font-size: 11px;
+  color: #9cabbc;
+}
+.discussion-numbers {
+  margin-left: auto;
+  font-size: 12px;
+  color: #9dabbc;
+  display: flex;
+  gap: 20px;
+  white-space: nowrap;
+}
+.discussion-numbers strong {
+  font-weight: 500;
+  color: #6a819e;
+}
+.comment-placeholder {
+  padding: 25px;
+  background: #f7f9fc;
+  border-radius: 5px;
+  margin: 20px 0 0;
+  font-size: 13px;
+  color: #94a4b9;
+  text-align: center;
+}
+.team-card {
+  padding: 24px;
+  display: flex;
+  gap: 20px;
+  align-items: start;
+}
+.team-logo {
+  width: 55px;
+  height: 55px;
+  border-radius: 10px;
+  background: #edf4ff;
+  color: #7faae0;
+  font:
+    600 20px ui-monospace,
+    monospace;
+  display: grid;
+  place-items: center;
+}
+.team-card h2 {
+  font-size: 17px;
+  margin: 3px 0 8px;
+}
+.team-card p {
+  font-size: 12px;
+  color: #96a5b7;
+}
+.team-card .tag-list {
+  margin-top: 15px;
+}
+@media (max-width: 1280px) {
+  .header-inner {
+    gap: 16px;
+  }
+  .main-nav a {
+    padding: 0 9px;
+    gap: 5px;
+  }
+  .main-nav .el-icon {
+    display: none;
+  }
+  .preview-label {
+    display: none;
+  }
+  .home-grid {
+    grid-template-columns: minmax(0, 1.6fr) minmax(300px, 1fr);
+  }
+  .hero-copy {
+    padding: 36px 28px;
+  }
+  .hero-copy p {
+    max-width: 270px;
+  }
+  .card-grid {
+    gap: 16px;
+  }
+  .training-card {
+    padding: 20px;
+    gap: 16px;
+  }
+  .training-illustration {
+    width: 55px;
+    height: 65px;
+  }
+  .content-with-aside {
+    grid-template-columns: minmax(0, 1fr) 280px;
+  }
+}
+@media (max-width: 960px) {
+  .brand-name {
+    font-size: 13px;
+  }
+  .brand-mark {
+    font-size: 25px;
+  }
+  .header-inner {
+    gap: 12px;
+  }
+  .main-nav a {
+    font-size: 12px;
+    padding: 0 7px;
+  }
+  .header-account {
+    gap: 5px;
+  }
+  .hero-copy {
+    max-width: 100%;
+    padding: 30px 24px;
+  }
+  .home-grid {
+    grid-template-columns: minmax(0, 1.45fr) minmax(270px, 1fr);
+    gap: 16px;
+  }
+  .home-grid .panel-heading {
+    padding: 14px 16px;
+  }
+  .home-grid .panel-body {
+    padding: 16px;
+  }
+  .home-rank .panel-body {
+    padding: 8px 10px;
+  }
+  .contest-status {
+    display: none;
+  }
+  .content-with-aside,
+  .card-grid,
+  .about-grid {
+    grid-template-columns: 1fr;
+  }
+  .admin-shell {
+    grid-template-columns: 175px minmax(0, 1fr);
+  }
+  .summary-card {
+    padding: 16px;
+  }
+  .summary-card strong {
+    font-size: 24px;
+  }
+}
+@media (max-width: 760px) {
+  .app-main {
+    width: calc(100% - 28px);
+    margin-top: 18px;
+  }
+  .header-inner {
+    width: calc(100% - 28px);
+    flex-wrap: wrap;
+    gap: 12px;
+    min-height: 64px;
+    padding: 14px 0;
+  }
+  .brand-name small {
+    font-size: 7px;
+  }
+  .mobile-toggle {
+    display: flex;
+    align-items: center;
+    gap: 5px;
+    padding: 5px 7px;
+    background: none;
+    border: 1px solid #e6edf5;
+    border-radius: 4px;
+    font-size: 12px;
+    color: #7e93ad;
+    margin-left: auto;
+  }
+  .header-account {
+    margin-left: 0;
+  }
+  .main-nav {
+    display: none;
+    order: 4;
+    width: 100%;
+    flex-wrap: wrap;
+    gap: 4px;
+    padding-top: 5px;
+  }
+  .main-nav.mobile-open {
+    display: flex;
+  }
+  .main-nav a {
+    padding: 9px 13px;
+    flex: 1 0 auto;
+    justify-content: center;
+    border-radius: 4px;
+    border-bottom: 0;
+  }
+  .main-nav .el-icon {
+    display: inline-flex;
+  }
+  .home-grid {
+    grid-template-columns: minmax(0, 1fr);
+  }
+  .hero-copy h1 {
+    font-size: 32px;
+  }
+  .hero-copy {
+    padding: 32px;
+  }
+  .hero-copy p {
+    max-width: 270px;
+  }
+  .footer-inner {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+    gap: 20px;
+  }
+  .footer-brand {
+    grid-column: 1/-1;
+  }
+  .footer-bottom {
+    gap: 12px;
+  }
+  .page-heading {
+    align-items: flex-start;
+    flex-wrap: wrap;
+    gap: 12px;
+  }
+  .page-heading h1 {
+    font-size: 23px;
+  }
+  .filters .el-input {
+    width: 100%;
+  }
+  .filters .el-select {
+    flex: 1;
+    min-width: 130px;
+    width: auto;
+  }
+  .pagination-row {
+    flex-wrap: wrap;
+    justify-content: center;
+  }
+  .pagination-row .el-pagination {
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: 8px;
+  }
+  .summary-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 12px;
+  }
+  .intro-banner {
+    padding: 24px;
+  }
+  .intro-number {
+    display: none;
+  }
+  .profile-banner {
+    padding: 24px;
+    gap: 16px;
+    flex-wrap: wrap;
+  }
+  .profile-banner > .avatar {
+    width: 60px;
+    height: 60px;
+    font-size: 24px;
+  }
+  .profile-actions {
+    margin-left: 0;
+    width: 100%;
+  }
+  .heatmap {
+    grid-template-columns: repeat(14, minmax(0, 1fr));
+  }
+  .auth-shell {
+    grid-template-columns: 1fr;
+    margin: 15px auto;
+  }
+  .auth-art {
+    display: none;
+  }
+  .auth-form {
+    padding: 28px;
+  }
+  .admin-shell {
+    grid-template-columns: 1fr;
+  }
+  .admin-sidebar {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 5px;
+    padding: 12px;
+  }
+  .admin-sidebar h2,
+  .admin-notice {
+    display: none;
+  }
+  .admin-sidebar a {
+    padding: 8px;
+    font-size: 12px;
+  }
+  .discussion-numbers {
+    display: none;
+  }
+  .form-panel .panel-body {
+    padding: 22px;
+  }
+  .service-row {
+    flex-wrap: wrap;
+  }
+  .panel-heading {
+    padding: 14px 16px;
+  }
+  .panel-body {
+    padding: 16px;
+  }
+  .details-list {
+    font-size: 12px;
+  }
+  .footer-inner,
+  .footer-bottom {
+    width: calc(100% - 40px);
+  }
+}
+@media (max-width: 420px) {
+  .brand-name {
+    font-size: 11px;
+  }
+  .brand-name small {
+    display: none;
+  }
+  .brand {
+    gap: 7px;
+  }
+  .header-inner {
+    gap: 7px;
+  }
+  .header-account .el-button {
+    padding: 7px 10px;
+  }
+  .mobile-toggle {
+    padding: 5px;
+    font-size: 11px;
+  }
+  .hero-copy {
+    padding: 30px 24px;
+  }
+  .hero-copy h1 {
+    font-size: 27px;
+  }
+  .hero-copy p {
+    max-width: 230px;
+    font-size: 12px;
+  }
+  .panel-heading h2 {
+    font-size: 14px;
+  }
+  .panel-heading small {
+    display: none;
+  }
+  .training-illustration {
+    display: none;
+  }
+  .discussion-item {
+    gap: 10px;
+  }
+  .discussion-item h2 {
+    font-size: 14px;
+  }
+  .discussion-item p {
+    gap: 7px;
+    flex-wrap: wrap;
+  }
+  .summary-card strong {
+    font-size: 22px;
+  }
+}
diff --git a/frontend/src/styles/blueprint.css b/frontend/src/styles/blueprint.css
new file mode 100644
index 0000000..4101af6
--- /dev/null
+++ b/frontend/src/styles/blueprint.css
@@ -0,0 +1,492 @@
+:root {
+  --el-border-radius-base: 8px;
+}
+.app-header {
+  position: sticky;
+  top: 0;
+  z-index: 100;
+  box-shadow: none;
+}
+.header-inner {
+  min-height: 76px;
+  max-width: 1360px;
+}
+.brand-mark {
+  font-size: 25px;
+  padding: 10px 12px;
+  border-radius: 11px;
+  background: #eaf4ff;
+  letter-spacing: -1.5px;
+}
+.brand-dot {
+  color: #409eff;
+}
+.brand-name {
+  font-size: 13px;
+}
+.brand-name small {
+  letter-spacing: 1.3px;
+}
+.main-nav {
+  gap: 5px;
+  align-items: center;
+}
+.main-nav a {
+  align-self: center;
+  padding: 10px 13px;
+  border: 0;
+  border-radius: 8px;
+  font-size: 13px;
+}
+.main-nav a.active {
+  border: 0;
+  background: #edf6ff;
+  font-weight: 650;
+}
+.main-nav .el-icon {
+  display: none;
+}
+.header-account .el-button {
+  border-radius: 8px;
+  padding: 8px 14px;
+}
+.app-main {
+  width: min(100% - 64px, 1360px);
+  margin-top: 30px;
+  margin-bottom: 50px;
+}
+.app-footer {
+  background: transparent;
+  box-shadow: none;
+  padding: 38px 0 22px;
+}
+.footer-inner,
+.footer-bottom {
+  max-width: 1360px;
+}
+.footer-brand .brand-mark {
+  display: inline-block;
+  background: #e3eefb;
+}
+.footer-inner h3 {
+  font-size: 12px;
+  color: #657e9e;
+}
+.panel {
+  border-radius: 16px;
+  box-shadow: none;
+  border: 1px solid #e1e8f1;
+}
+.panel-heading {
+  border: 0;
+  padding: 23px 24px 10px;
+  min-height: 68px;
+  align-items: flex-start;
+}
+.panel-heading h2 {
+  color: #455e80;
+  font-size: 17px;
+  font-weight: 650;
+  gap: 6px;
+  display: grid;
+}
+.panel-heading h2 > .el-icon {
+  display: none;
+}
+.panel-heading small {
+  margin: 0;
+  font-size: 10px;
+  letter-spacing: 0.3px;
+}
+.panel-body {
+  padding: 18px 24px 24px;
+}
+.panel-actions {
+  padding-top: 4px;
+  font-size: 11px;
+}
+.panel-actions a {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+}
+.page-heading {
+  margin: 8px 0 30px;
+  align-items: flex-end;
+}
+.page-heading h1 {
+  font-size: 34px;
+  letter-spacing: -1.2px;
+  color: #2e405b;
+  font-weight: 700;
+  margin: 10px 0 10px;
+}
+.page-heading .eyebrow {
+  color: #91a3bb;
+  font:
+    10px ui-monospace,
+    monospace;
+  letter-spacing: 2px;
+}
+.page-heading p {
+  font-size: 13px;
+}
+.el-button {
+  border-radius: 8px;
+}
+.el-table {
+  --el-table-header-bg-color: #f3f7fc;
+  --el-table-row-hover-bg-color: #f4f9ff;
+  --el-fill-color-lighter: #fff;
+  font-size: 13px;
+  border-radius: 8px;
+}
+.el-table .el-table__cell {
+  padding: 16px 0;
+}
+.el-table th.el-table__cell {
+  padding: 13px 0;
+  font-size: 11px;
+  color: #8a99ac;
+  letter-spacing: 0.3px;
+}
+.el-table .cell {
+  padding: 0 14px;
+}
+.table-link {
+  font-weight: 600;
+}
+.filters {
+  padding: 16px;
+  background: #f6f9fd;
+  border-radius: 10px;
+  gap: 10px;
+  margin-bottom: 22px;
+}
+.filters .el-input {
+  width: 260px;
+}
+.pagination-row {
+  margin-top: 22px;
+  padding-top: 18px;
+  border-top: 1px solid var(--line);
+}
+.tag,
+.difficulty,
+.el-tag {
+  border-radius: 5px;
+}
+.summary-card {
+  border-radius: 14px;
+  position: relative;
+  padding: 24px;
+  border-bottom: 3px solid #dbeaff;
+}
+.summary-card strong {
+  font:
+    650 32px ui-monospace,
+    monospace;
+  margin-top: 12px;
+}
+.intro-banner {
+  border-radius: 16px;
+  border-left: 4px solid #9cc8f5;
+  padding: 32px;
+}
+.training-card {
+  border-radius: 16px;
+  flex-direction: column;
+  gap: 10px;
+  position: relative;
+  padding: 26px;
+}
+.training-illustration {
+  width: 48px;
+  height: 48px;
+  border-radius: 12px;
+  font-size: 21px;
+}
+.training-card h2 {
+  font-size: 20px;
+  margin: 15px 0 10px;
+}
+.training-card p {
+  font-size: 13px;
+  line-height: 1.9;
+}
+.card-meta {
+  padding-top: 15px;
+  border-top: 1px solid var(--line);
+  flex-wrap: wrap;
+}
+.team-card {
+  border-radius: 16px;
+  flex-direction: column;
+}
+.team-logo {
+  width: 48px;
+  height: 48px;
+}
+.profile-banner {
+  border-radius: 18px;
+  border-left: 5px solid #a9cef5;
+}
+.profile-banner > .avatar {
+  border-radius: 22px;
+}
+.discussion-item {
+  padding: 24px 8px;
+}
+.discussion-item .avatar {
+  border-radius: 12px;
+}
+.discussion-item h2 {
+  font-size: 16px;
+  font-weight: 600;
+}
+.detail-prose h2 {
+  color: #455e80;
+  font-size: 18px;
+  padding-left: 12px;
+  border-left: 3px solid #b5d5f7;
+}
+.sample-block {
+  border-radius: 10px;
+  background: #f6f9fd;
+  border: 1px solid #e4edf7;
+}
+.auth-shell {
+  border-radius: 22px;
+  border: 1px solid #e1e8f1;
+  box-shadow: none;
+}
+.auth-art {
+  padding: 50px;
+  background-image: url('/images/practice-space.svg');
+  background-size: 90%;
+  background-position: center bottom;
+  background-repeat: no-repeat;
+  min-height: 520px;
+}
+.auth-art h1 {
+  font-size: 33px;
+  max-width: 300px;
+  line-height: 1.5;
+}
+.about-feature {
+  border-radius: 14px;
+  padding: 26px;
+}
+#tags {
+  scroll-margin-top: 98px;
+}
+.admin-application {
+  min-height: 100dvh;
+}
+.admin-app-header {
+  min-height: 80px;
+  display: flex;
+  align-items: center;
+  gap: 26px;
+  padding: 0 30px;
+  background: #fff;
+  border-bottom: 1px solid #e1e8f1;
+  position: sticky;
+  top: 0;
+  z-index: 100;
+}
+.admin-app-label {
+  font-size: 11px;
+  color: #91a3bb;
+  padding-left: 26px;
+  border-left: 1px solid #e1e8f1;
+}
+.admin-return {
+  font-size: 12px;
+  color: #657e9e;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin-left: auto;
+}
+.admin-app-nav {
+  position: fixed;
+  left: 0;
+  top: 80px;
+  bottom: 0;
+  width: 210px;
+  background: #fff;
+  border-right: 1px solid #e1e8f1;
+  padding: 30px 18px;
+  display: flex;
+  flex-direction: column;
+  gap: 7px;
+}
+.admin-app-nav a {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+  padding: 14px 18px;
+  font-size: 13px;
+  color: #7b8da5;
+  border-radius: 9px;
+}
+.admin-app-nav a.active {
+  background: #edf6ff;
+  color: #409eff;
+  font-weight: 600;
+}
+.admin-app-main {
+  margin: 32px 32px 48px 242px;
+  min-width: 0;
+}
+.admin-app-main .admin-shell {
+  display: block;
+}
+.admin-app-footer {
+  margin-left: 242px;
+  padding: 22px 32px 28px 0;
+  border-top: 1px solid #e1e8f1;
+  display: flex;
+  gap: 12px;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  color: #9aa5b5;
+  font-size: 10px;
+}
+@media (min-width: 1200px) {
+  .card-grid {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
+}
+@media (max-width: 1100px) {
+  .header-inner {
+    gap: 18px;
+  }
+  .main-nav a {
+    padding: 10px;
+  }
+  .brand-name {
+    display: none;
+  }
+  .preview-label {
+    display: none;
+  }
+}
+@media (max-width: 960px) {
+  .panel-body {
+    padding: 16px 20px 22px;
+  }
+  .panel-heading {
+    padding: 22px 20px 8px;
+  }
+  .page-heading h1 {
+    font-size: 30px;
+  }
+  .admin-app-label {
+    display: none;
+  }
+}
+@media (max-width: 760px) {
+  .header-inner {
+    min-height: 66px;
+    padding: 10px 0;
+  }
+  .brand-name {
+    display: block;
+  }
+  .brand-mark {
+    font-size: 20px;
+    padding: 9px 10px;
+  }
+  .main-nav a {
+    padding: 11px 15px;
+  }
+  .main-nav .el-icon {
+    display: none;
+  }
+  .header-account .el-button {
+    padding: 8px 11px;
+  }
+  .mobile-toggle {
+    border-radius: 7px;
+    padding: 7px;
+  }
+  .app-main {
+    width: calc(100% - 28px);
+    margin-top: 22px;
+  }
+  .page-heading {
+    align-items: flex-start;
+  }
+  .page-heading h1 {
+    font-size: 28px;
+  }
+  .panel-heading {
+    padding: 20px 18px 8px;
+    min-height: 65px;
+  }
+  .panel-heading h2 {
+    font-size: 16px;
+  }
+  .panel-heading small {
+    display: block;
+  }
+  .panel-body {
+    padding: 16px 18px 20px;
+  }
+  .filters {
+    padding: 12px;
+  }
+  .filters .el-input {
+    width: 100%;
+  }
+  .training-card,
+  .team-card {
+    padding: 22px;
+  }
+  .training-illustration {
+    display: grid;
+  }
+  .summary-card {
+    padding: 20px;
+  }
+  .summary-card strong {
+    font-size: 26px;
+  }
+  .admin-app-header {
+    min-height: 70px;
+    padding: 0 18px;
+  }
+  .admin-app-header .brand-name {
+    font-size: 12px;
+  }
+  .admin-app-nav {
+    width: 62px;
+    top: 70px;
+    padding: 20px 7px;
+  }
+  .admin-app-nav a {
+    padding: 14px 15px;
+  }
+  .admin-app-nav a span {
+    display: none;
+  }
+  .admin-app-main {
+    margin: 24px 14px 35px 76px;
+  }
+  .admin-app-footer {
+    margin-left: 76px;
+    padding-right: 14px;
+  }
+  .admin-return {
+    font-size: 11px;
+  }
+  .auth-art {
+    min-height: 0;
+  }
+  .footer-inner,
+  .footer-bottom {
+    width: calc(100% - 36px);
+  }
+}
diff --git a/frontend/src/views/AboutView.vue b/frontend/src/views/AboutView.vue
new file mode 100644
index 0000000..a6df682
--- /dev/null
+++ b/frontend/src/views/AboutView.vue
@@ -0,0 +1,81 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { usePlatformHealth } from '../composables/usePlatformHealth'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import UiIcon from '../components/UiIcon.vue'
+const { state, version, refresh } = usePlatformHealth()
+const status = computed(
+  () =>
+    ({ loading: '正在检查', connected: 'API 进程已连接', unavailable: 'API 暂未连接' })[
+      state.value
+    ],
+)
+const features = [
+  { icon: 'problems', title: '练习与训练', text: '从基础题目到算法专题，通过题单组织日常练习。' },
+  { icon: 'contests', title: '竞赛与评测', text: '围绕提交、评测和比赛，逐步完成在线评测流程。' },
+  {
+    icon: 'discussions',
+    title: '交流与成长',
+    text: '分享解题思路，结合练习记录，探索更合适的学习路径。',
+  },
+]
+</script>
+<template>
+  <PageHeading
+    title="关于 KF OnlineJudge"
+    eyebrow="ABOUT"
+    description="从一道题开始，积累每一次进步。"
+  />
+  <div class="intro-banner">
+    <div>
+      <p class="eyebrow">CODE · PRACTICE · GROW</p>
+      <h2>让思路在代码里落地。</h2>
+      <p>
+        KF OnlineJudge
+        是一个正在开发的在线评测项目，关注判题、沙箱、分布式执行与故障恢复，并逐步提供辅助答疑和个性化训练。
+      </p>
+    </div>
+    <span class="intro-number">KF.</span>
+  </div>
+  <div class="stack">
+    <PanelCard title="在这里，你可以" icon="reading"
+      ><div class="about-grid">
+        <div v-for="feature in features" :key="feature.title" class="about-feature">
+          <UiIcon :name="feature.icon" />
+          <h3>{{ feature.title }}</h3>
+          <p>{{ feature.text }}</p>
+        </div>
+      </div></PanelCard
+    ><PanelCard id="system" title="系统状态" icon="monitor"
+      ><div class="service-row">
+        <div>
+          <h3>
+            平台 API
+            <el-tag
+              :type="state === 'connected' ? 'success' : 'info'"
+              size="small"
+              effect="plain"
+              >{{ status }}</el-tag
+            >
+          </h3>
+          <p>
+            这是实际的 API 存活检查。{{ version && state === 'connected' ? '版本 ' + version : '' }}
+          </p>
+          <p>数据库、题库、评测与学习服务将分别接入。</p>
+        </div>
+        <el-button :loading="state === 'loading'" @click="refresh">重新检查</el-button>
+      </div></PanelCard
+    ><PanelCard title="使用说明" icon="about"
+      ><div class="detail-prose">
+        <p>
+          当前为前端预览版本。题目、比赛、排名和用户信息使用示例数据；页面筛选、导航和本地代码草稿已可使用。
+        </p>
+        <p style="margin-top: 12px">
+          题目页可以选择语言、切换编辑器主题、保存草稿和填写自测输入。实际评测、账号和团队创建将在服务接入后开放。
+        </p>
+        <p style="margin-top: 12px">备案信息待填写，平台规则和联系方式将在上线前补充。</p>
+      </div></PanelCard
+    >
+  </div>
+</template>
diff --git a/frontend/src/views/AuthView.vue b/frontend/src/views/AuthView.vue
new file mode 100644
index 0000000..6f550a7
--- /dev/null
+++ b/frontend/src/views/AuthView.vue
@@ -0,0 +1,100 @@
+<script setup lang="ts">
+import { computed, reactive, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
+const route = useRoute()
+const registering = computed(() => route.path === '/register')
+const form = ref<FormInstance>()
+const model = reactive({ username: '', email: '', password: '', confirmation: '' })
+const rules = computed<FormRules<typeof model>>(() => ({
+  username: [
+    { required: true, message: '请输入用户名', trigger: 'blur' },
+    ...(registering.value
+      ? [
+          {
+            pattern: /^[a-zA-Z0-9_]{3,24}$/,
+            message: '使用 3 至 24 位字母、数字或下划线',
+            trigger: 'blur',
+          },
+        ]
+      : []),
+  ],
+  email: [
+    { required: true, message: '请输入邮箱', trigger: 'blur' },
+    { type: 'email', message: '请填写有效邮箱', trigger: 'blur' },
+  ],
+  password: [
+    { required: true, message: '请输入密码', trigger: 'blur' },
+    ...(registering.value ? [{ min: 8, message: '密码至少包含 8 个字符', trigger: 'blur' }] : []),
+  ],
+  confirmation: [
+    { required: true, message: '请再次输入密码', trigger: 'blur' },
+    {
+      validator: (_rule, value, callback) =>
+        value === model.password ? callback() : callback(new Error('两次输入的密码不一致')),
+      trigger: 'blur',
+    },
+  ],
+}))
+async function submit() {
+  if (await form.value?.validate().catch(() => false))
+    ElMessage.info('账号服务尚未接入，暂时无法' + (registering.value ? '注册' : '登录'))
+}
+</script>
+<template>
+  <div class="auth-shell">
+    <aside class="auth-art">
+      <RouterLink to="/" class="brand"
+        ><span class="brand-mark">KF.</span><span class="brand-name">OnlineJudge</span></RouterLink
+      >
+      <h1>写下思路，<br />开始这一题。</h1>
+      <p>练习、竞赛、讨论。<br />每一步，都算数。</p>
+    </aside>
+    <section class="auth-form">
+      <p class="eyebrow">WELCOME TO KF ONLINEJUDGE</p>
+      <h2>{{ registering ? '创建你的账号' : '欢迎回来' }}</h2>
+      <p>{{ registering ? '准备好开始新的练习了吗？' : '继续你的算法练习之旅。' }}</p>
+      <el-form
+        ref="form"
+        :model="model"
+        :rules="rules"
+        label-position="top"
+        @submit.prevent="submit"
+        ><el-form-item label="用户名" prop="username"
+          ><el-input
+            v-model="model.username"
+            placeholder="请输入用户名"
+            autocomplete="username" /></el-form-item
+        ><el-form-item v-if="registering" label="邮箱" prop="email"
+          ><el-input
+            v-model="model.email"
+            placeholder="your@email.com"
+            autocomplete="email" /></el-form-item
+        ><el-form-item label="密码" prop="password"
+          ><el-input
+            v-model="model.password"
+            type="password"
+            show-password
+            placeholder="请输入密码"
+            :autocomplete="registering ? 'new-password' : 'current-password'" /></el-form-item
+        ><el-form-item v-if="registering" label="确认密码" prop="confirmation"
+          ><el-input
+            v-model="model.confirmation"
+            type="password"
+            show-password
+            placeholder="再次输入密码"
+            autocomplete="new-password" /></el-form-item
+        ><el-button type="primary" native-type="submit">{{
+          registering ? '注册' : '登录'
+        }}</el-button></el-form
+      >
+      <p class="form-help" style="margin-top: 14px">账号功能待接入，当前不会创建账号或保存密码。</p>
+      <div class="auth-links">
+        <RouterLink to="/">← 返回首页</RouterLink
+        ><RouterLink :to="registering ? '/login' : '/register'">{{
+          registering ? '已有账号？去登录' : '还没有账号？去注册'
+        }}</RouterLink>
+      </div>
+    </section>
+  </div>
+</template>
diff --git a/frontend/src/views/ContestDetailView.vue b/frontend/src/views/ContestDetailView.vue
new file mode 100644
index 0000000..ef8712b
--- /dev/null
+++ b/frontend/src/views/ContestDetailView.vue
@@ -0,0 +1,77 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { contests, problems } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const tab = ref('overview')
+const contest = computed(() => contests.find((c) => c.id === route.params.id))
+const items = computed(() => problems.filter((p) => contest.value?.ids.includes(p.id)))
+</script>
+<template>
+  <template v-if="contest"
+    ><div class="breadcrumbs">
+      <RouterLink to="/contests">比赛</RouterLink><span>/</span><span>{{ contest.title }}</span>
+    </div>
+    <PageHeading :title="contest.title" :description="contest.description"
+      ><el-tag effect="light">{{ contest.status }} · 示例</el-tag></PageHeading
+    >
+    <div class="content-with-aside">
+      <PanelCard title="比赛信息" icon="contests"
+        ><el-tabs v-model="tab"
+          ><el-tab-pane label="比赛说明" name="overview"
+            ><div class="detail-prose">
+              <h2>比赛介绍</h2>
+              <p>{{ contest.description }}</p>
+              <h2>比赛规则</h2>
+              <p>
+                {{
+                  contest.type === 'ACM'
+                    ? 'ACM 赛制按照通过题目数排序，通过数相同时比较罚时。'
+                    : 'OI 赛制按照题目得分总和排序。具体规则以实际比赛公告为准。'
+                }}
+              </p>
+              <h2>参赛须知</h2>
+              <p>
+                认真阅读每道题的数据范围和限制。赛程、题目和状态当前为界面示例，报名功能将在比赛服务接入后开放。
+              </p>
+            </div></el-tab-pane
+          ><el-tab-pane label="比赛题目" name="problems"
+            ><ProblemTable :items="items" compact /></el-tab-pane
+          ><el-tab-pane label="比赛榜单" name="rank"
+            ><EmptyState
+              title="暂无实际比赛成绩"
+              description="比赛服务接入后展示实时榜单。" /></el-tab-pane
+          ><el-tab-pane label="提交记录" name="submissions"
+            ><EmptyState title="暂无实际提交记录" /></el-tab-pane></el-tabs></PanelCard
+      ><PanelCard title="比赛概况" icon="clock"
+        ><dl class="details-list">
+          <div>
+            <dt>赛制</dt>
+            <dd>{{ contest.type }}</dd>
+          </div>
+          <div>
+            <dt>开始时间</dt>
+            <dd>{{ contest.start }}</dd>
+          </div>
+          <div>
+            <dt>比赛时长</dt>
+            <dd>{{ contest.duration }}</dd>
+          </div>
+          <div>
+            <dt>题目数量</dt>
+            <dd>{{ items.length }} 道</dd>
+          </div>
+        </dl>
+        <el-button type="primary" disabled style="width: 100%; margin-top: 25px"
+          >报名功能待接入</el-button
+        ></PanelCard
+      >
+    </div></template
+  ><EmptyState v-else title="比赛不存在"
+    ><RouterLink to="/contests"><el-button>返回比赛列表</el-button></RouterLink></EmptyState
+  >
+</template>
diff --git a/frontend/src/views/ContestsView.vue b/frontend/src/views/ContestsView.vue
new file mode 100644
index 0000000..a7315fe
--- /dev/null
+++ b/frontend/src/views/ContestsView.vue
@@ -0,0 +1,73 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { contests } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import PageHeading from '../components/PageHeading.vue'
+const status = ref('全部')
+const query = ref('')
+const type = ref('')
+const items = computed(() =>
+  contests.filter(
+    (c) =>
+      (status.value === '全部' || c.status === status.value) &&
+      (!type.value || c.type === type.value) &&
+      c.title.includes(query.value),
+  ),
+)
+</script>
+<template>
+  <PageHeading title="比赛" eyebrow="CONTESTS" description="在有限的时间里，挑战新的问题。" />
+  <PanelCard title="比赛列表" icon="contests" subtitle="示例赛程"
+    ><div class="filters">
+      <el-radio-group v-model="status"
+        ><el-radio-button
+          v-for="s in ['全部', '即将开始', '进行中', '已结束']"
+          :key="s"
+          :value="s"
+          >{{ s }}</el-radio-button
+        ></el-radio-group
+      ><el-input v-model="query" placeholder="搜索比赛" aria-label="搜索比赛" clearable /><el-select
+        v-model="type"
+        placeholder="全部赛制"
+        aria-label="赛制"
+        clearable
+        ><el-option label="ACM" value="ACM" /><el-option label="OI" value="OI"
+      /></el-select>
+    </div>
+    <el-table :data="items" stripe empty-text="没有符合条件的比赛"
+      ><el-table-column label="比赛名称" min-width="270"
+        ><template #default="{ row }"
+          ><RouterLink class="table-link" :to="'/contests/' + row.id">{{
+            row.title
+          }}</RouterLink></template
+        ></el-table-column
+      ><el-table-column label="赛制" width="85" prop="type" /><el-table-column
+        label="状态"
+        width="120"
+        ><template #default="{ row }"
+          ><el-tag
+            size="small"
+            :type="
+              row.status === '进行中' ? 'success' : row.status === '已结束' ? 'info' : 'primary'
+            "
+            effect="light"
+            >{{ row.status }}</el-tag
+          ></template
+        ></el-table-column
+      ><el-table-column label="开始时间" prop="start" min-width="160" /><el-table-column
+        label="时长"
+        prop="duration"
+        width="100"
+      /><el-table-column label="题目" width="90"
+        ><template #default="{ row }">{{ row.ids.length }} 道</template></el-table-column
+      ><el-table-column label="" width="100"
+        ><template #default="{ row }"
+          ><RouterLink class="text-link" :to="'/contests/' + row.id"
+            >查看比赛 →</RouterLink
+          ></template
+        ></el-table-column
+      ></el-table
+    >
+    <p class="tab-summary">共 {{ items.length }} 场比赛</p></PanelCard
+  >
+</template>
diff --git a/frontend/src/views/CreateTeamView.vue b/frontend/src/views/CreateTeamView.vue
new file mode 100644
index 0000000..0b219c1
--- /dev/null
+++ b/frontend/src/views/CreateTeamView.vue
@@ -0,0 +1,69 @@
+<script setup lang="ts">
+import { reactive, ref } from 'vue'
+import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+const form = ref<FormInstance>()
+const model = reactive({ name: '', description: '', visibility: 'public', joinMode: 'approval' })
+const rules: FormRules<typeof model> = {
+  name: [
+    { required: true, message: '请填写团队名称', trigger: 'blur' },
+    { min: 2, max: 30, message: '名称长度为 2 到 30 个字符', trigger: 'blur' },
+  ],
+  description: [
+    { required: true, message: '请填写团队介绍', trigger: 'blur' },
+    { max: 500, message: '介绍最多 500 个字符', trigger: 'blur' },
+  ],
+}
+async function validate() {
+  if (await form.value?.validate().catch(() => false))
+    ElMessage.info('填写已通过检查，团队创建功能待服务接入')
+}
+</script>
+<template>
+  <PageHeading
+    title="创建团队"
+    eyebrow="CREATE A TEAM"
+    description="为团队起一个名字，写下你们想一起完成的事情。"
+    ><RouterLink to="/teams"><el-button>返回团队列表</el-button></RouterLink></PageHeading
+  ><PanelCard title="团队资料" icon="teams" class="form-panel"
+    ><el-form
+      ref="form"
+      :model="model"
+      :rules="rules"
+      label-position="top"
+      @submit.prevent="validate"
+      ><el-form-item label="团队名称" prop="name"
+        ><el-input
+          v-model="model.name"
+          placeholder="例如：KF 算法研习组"
+          maxlength="30"
+          show-word-limit /></el-form-item
+      ><el-form-item label="团队介绍" prop="description"
+        ><el-input
+          v-model="model.description"
+          type="textarea"
+          :rows="5"
+          placeholder="介绍团队的练习方向、交流方式和目标"
+          maxlength="500"
+          show-word-limit /></el-form-item
+      ><el-form-item label="可见性"
+        ><el-radio-group v-model="model.visibility"
+          ><el-radio value="public">公开团队</el-radio
+          ><el-radio value="private">私有团队</el-radio></el-radio-group
+        >
+        <p class="form-help">公开团队可在团队列表中发现，私有团队通过邀请加入。</p></el-form-item
+      ><el-form-item label="加入方式"
+        ><el-radio-group v-model="model.joinMode"
+          ><el-radio value="approval">需要审核</el-radio
+          ><el-radio value="invite">仅接受邀请</el-radio></el-radio-group
+        ></el-form-item
+      >
+      <div class="form-actions">
+        <el-button native-type="submit">检查填写</el-button
+        ><el-button type="primary" disabled>创建团队</el-button
+        ><span class="muted">团队服务待接入</span>
+      </div></el-form
+    ></PanelCard
+  >
+</template>
diff --git a/frontend/src/views/DiscussionDetailView.vue b/frontend/src/views/DiscussionDetailView.vue
new file mode 100644
index 0000000..c5a9f42
--- /dev/null
+++ b/frontend/src/views/DiscussionDetailView.vue
@@ -0,0 +1,40 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import { discussions } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const discussion = computed(() => discussions.find((d) => d.id === route.params.id))
+</script>
+<template>
+  <template v-if="discussion"
+    ><div class="breadcrumbs">
+      <RouterLink to="/discussions">讨论</RouterLink><span>/</span
+      ><span>{{ discussion.category }}</span>
+    </div>
+    <PageHeading :title="discussion.title"
+      ><el-tag effect="plain">{{ discussion.category }}</el-tag></PageHeading
+    ><PanelCard title="正文" icon="reading" subtitle="示例文章"
+      ><div class="detail-meta">
+        <RouterLink :to="'/users/' + discussion.author">{{ discussion.author }}</RouterLink
+        ><time>{{ discussion.date }}</time
+        ><span>{{ discussion.views }} 次浏览</span>
+      </div>
+      <div class="detail-prose">
+        <p>{{ discussion.content }}</p>
+      </div>
+      <RouterLink
+        v-if="discussion.problemId"
+        class="text-link"
+        :to="'/problems/' + discussion.problemId"
+        style="display: inline-block; margin-top: 24px"
+        >查看相关题目 →</RouterLink
+      >
+      <div class="comment-placeholder">评论功能将在社区服务接入后开放。</div></PanelCard
+    ></template
+  ><EmptyState v-else title="讨论不存在"
+    ><RouterLink to="/discussions"><el-button>返回讨论列表</el-button></RouterLink></EmptyState
+  >
+</template>
diff --git a/frontend/src/views/DiscussionsView.vue b/frontend/src/views/DiscussionsView.vue
new file mode 100644
index 0000000..3ed69ef
--- /dev/null
+++ b/frontend/src/views/DiscussionsView.vue
@@ -0,0 +1,77 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { discussions, rankings } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+const category = ref('全部')
+const query = ref('')
+const items = computed(() =>
+  discussions.filter(
+    (d) =>
+      (category.value === '全部' || d.category === category.value) && d.title.includes(query.value),
+  ),
+)
+</script>
+<template>
+  <PageHeading
+    title="讨论社区"
+    eyebrow="COMMUNITY"
+    description="分享思路，提出问题，一起把代码写得更好。"
+    ><el-tooltip content="讨论发布将在账号服务接入后开放"
+      ><el-button type="primary" disabled>发起讨论</el-button></el-tooltip
+    ></PageHeading
+  >
+  <div class="content-with-aside">
+    <PanelCard title="最新讨论" icon="discussions" subtitle="示例文章"
+      ><div class="filters">
+        <el-radio-group v-model="category"
+          ><el-radio-button
+            v-for="c in ['全部', '交流', '问答', '题解', '反馈']"
+            :key="c"
+            :value="c"
+            >{{ c }}</el-radio-button
+          ></el-radio-group
+        ><el-input v-model="query" placeholder="搜索讨论" aria-label="搜索讨论" clearable />
+      </div>
+      <article v-for="discussion in items" :key="discussion.id" class="discussion-item">
+        <RouterLink
+          :to="'/users/' + discussion.author"
+          class="avatar"
+          :style="{ background: rankings.find((r) => r.username === discussion.author)?.color }"
+          >{{ discussion.author[0] }}</RouterLink
+        >
+        <div>
+          <h2>
+            <el-tag v-if="discussion.pinned" size="small" effect="plain">置顶</el-tag
+            ><RouterLink :to="'/discussions/' + discussion.id">{{ discussion.title }}</RouterLink>
+          </h2>
+          <p>
+            <span class="tag">{{ discussion.category }}</span
+            ><RouterLink :to="'/users/' + discussion.author">{{ discussion.author }}</RouterLink
+            ><span>{{ discussion.date }}</span>
+          </p>
+        </div>
+        <div class="discussion-numbers">
+          <span
+            ><strong>{{ discussion.replies }}</strong> 回复</span
+          ><span>{{ discussion.views }} 浏览</span>
+        </div>
+      </article>
+      <el-empty v-if="!items.length" description="没有符合条件的讨论"
+    /></PanelCard>
+    <div class="stack">
+      <PanelCard title="欢迎交流" icon="reading"
+        ><p class="small muted">
+          提问时写清楚题号、语言、报错和已经尝试过的思路。分享题解时，也可以记录从哪里开始卡住，以及后来怎样找到解法。
+        </p></PanelCard
+      ><PanelCard title="社区分区" icon="folder"
+        ><dl class="details-list">
+          <div v-for="c in ['交流', '问答', '题解', '反馈']" :key="c">
+            <dt>{{ c }}</dt>
+            <dd>{{ discussions.filter((d) => d.category === c).length }} 篇示例文章</dd>
+          </div>
+        </dl></PanelCard
+      >
+    </div>
+  </div>
+</template>
diff --git a/frontend/src/views/HomeView.vue b/frontend/src/views/HomeView.vue
new file mode 100644
index 0000000..b200cf3
--- /dev/null
+++ b/frontend/src/views/HomeView.vue
@@ -0,0 +1,550 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { notices, rankings, contests, problems, problemTags } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+import SubmissionChart from '../components/SubmissionChart.vue'
+import TagSphere from '../components/TagSphere.vue'
+import UiIcon from '../components/UiIcon.vue'
+const router = useRouter()
+const noticeOpen = ref(false)
+const selectedNotice = ref(notices[0]!)
+function openNotice(index: number) {
+  selectedNotice.value = notices[index]!
+  noticeOpen.value = true
+}
+</script>
+<template>
+  <div class="practice-home">
+    <section class="practice-hero">
+      <div class="practice-hero-copy">
+        <p class="eyebrow">KF ONLINEJUDGE / PRACTICE SPACE</p>
+        <h1>把想法写成代码，<br />让思路一步步清晰。</h1>
+        <p class="practice-intro">
+          从一道题开始，沿着自己的节奏练习。<br />在这里写代码、做训练，也和同伴一起迎接新的挑战。
+        </p>
+        <div class="practice-actions">
+          <RouterLink to="/problems"
+            ><el-button type="primary" size="large"
+              >开始解题 <UiIcon name="arrow" /></el-button></RouterLink
+          ><RouterLink to="/trainings" class="practice-secondary"
+            >浏览训练题单 <UiIcon name="arrow"
+          /></RouterLink>
+        </div>
+        <div class="practice-hero-meta">
+          <span
+            ><strong>{{ problems.length }}</strong> 道示例题目</span
+          ><span
+            ><strong>{{ problemTags.length }}</strong> 个算法标签</span
+          ><span>ACM / OI</span>
+        </div>
+      </div>
+      <div class="practice-hero-art">
+        <img
+          src="/images/practice-space.svg"
+          alt="蓝色路径连接代码、算法节点与完成标记的编程空间插画"
+        />
+      </div>
+    </section>
+    <section class="practice-announcements" aria-label="站内公告">
+      <div class="announcements-label">
+        <UiIcon name="bell" /><strong>站内公告</strong><span>示例内容</span>
+      </div>
+      <button v-for="(notice, index) in notices" :key="notice.id" @click="openNotice(index)">
+        <time>{{ notice.date.slice(5) }}</time
+        ><span>{{ notice.title }}</span
+        ><UiIcon name="arrow" />
+      </button>
+    </section>
+    <div class="practice-activity">
+      <PanelCard class="activity-panel" title="练习的每一步" subtitle="最近一周 · 示例统计">
+        <template #actions
+          ><RouterLink to="/submissions">查看评测 <UiIcon name="arrow" /></RouterLink
+        ></template>
+        <div class="activity-totals">
+          <div>
+            <span>累计提交</span><strong>544<small>次</small></strong>
+          </div>
+          <div>
+            <span>通过提交</span><strong>342<small>次</small></strong>
+          </div>
+          <div>
+            <span>统计周期</span
+            ><strong class="activity-period">09.28 <small>—</small> 10.04</strong>
+          </div>
+        </div>
+        <SubmissionChart />
+      </PanelCard>
+      <PanelCard
+        id="tags"
+        class="explore-panel"
+        title="算法探索"
+        :subtitle="problemTags.length + ' 个标签'"
+      >
+        <TagSphere
+          :tags="problemTags"
+          @select="(tag) => router.push({ path: '/problems', query: { tag } })"
+        />
+      </PanelCard>
+    </div>
+    <div class="practice-library">
+      <PanelCard title="从这里开始解题" subtitle="最新题目">
+        <template #actions
+          ><RouterLink to="/problems">完整题库 <UiIcon name="arrow" /></RouterLink
+        ></template>
+        <ProblemTable :items="problems.slice(0, 6)" compact />
+        <div class="practice-library-note">
+          <span>换一个角度，试试新的解法。</span
+          ><RouterLink to="/trainings">按专题练习 <UiIcon name="arrow" /></RouterLink>
+        </div>
+      </PanelCard>
+      <PanelCard class="practice-rank" title="一起向前" subtitle="过题榜 · 示例排名">
+        <template #actions
+          ><RouterLink to="/rankings">全部 <UiIcon name="arrow" /></RouterLink
+        ></template>
+        <RouterLink
+          v-for="(user, index) in rankings.slice(0, 5)"
+          :key="user.username"
+          :to="'/users/' + user.username"
+          class="practice-rank-row"
+          ><span class="rank-index">{{ String(index + 1).padStart(2, '0') }}</span
+          ><span class="avatar" :style="{ background: user.color }">{{ user.username[0] }}</span>
+          <div>
+            <strong>{{ user.username }}</strong>
+            <p>{{ user.motto }}</p>
+          </div>
+          <span class="rank-solved"
+            ><strong>{{ user.solved }}</strong
+            ><small>过题</small></span
+          ></RouterLink
+        >
+      </PanelCard>
+    </div>
+    <section class="practice-contests">
+      <div class="section-title">
+        <div>
+          <p class="eyebrow">NEXT CHALLENGE</p>
+          <h2>给下一场挑战留点时间。</h2>
+        </div>
+        <RouterLink to="/contests">比赛日历 <UiIcon name="arrow" /></RouterLink>
+      </div>
+      <div class="practice-contest-grid">
+        <RouterLink
+          v-for="contest in contests.slice(0, 3)"
+          :key="contest.id"
+          :to="'/contests/' + contest.id"
+          class="practice-contest-card"
+          ><div>
+            <span class="tag">{{ contest.type }}</span
+            ><span>{{ contest.status }}</span>
+          </div>
+          <h3>{{ contest.title }}</h3>
+          <p><UiIcon name="clock" />{{ contest.start }} · {{ contest.duration }}</p>
+          <span class="contest-enter">查看比赛 <UiIcon name="arrow" /></span
+        ></RouterLink>
+      </div>
+      <p class="practice-demo-note">示例赛程，实际安排以平台发布的信息为准。</p>
+    </section>
+    <div class="practice-links">
+      <span>练习之外，也可以一起聊聊。</span
+      ><RouterLink to="/discussions">讨论交流 <UiIcon name="arrow" /></RouterLink
+      ><RouterLink to="/teams/create">创建团队 <UiIcon name="arrow" /></RouterLink
+      ><RouterLink to="/about">关于 KF OJ <UiIcon name="arrow" /></RouterLink>
+    </div>
+  </div>
+  <el-dialog v-model="noticeOpen" :title="selectedNotice.title" width="min(600px,92vw)"
+    ><p class="small muted">{{ selectedNotice.date }} · {{ selectedNotice.category }} · 示例公告</p>
+    <p style="margin-top: 20px; line-height: 1.9">{{ selectedNotice.text }}</p></el-dialog
+  >
+</template>
+<style scoped>
+.practice-home {
+  display: grid;
+  gap: 28px;
+}
+.practice-hero {
+  display: grid;
+  grid-template-columns: 1.2fr 1fr;
+  min-height: 360px;
+  border-radius: 20px;
+  background: linear-gradient(110deg, #fff 36%, #eaf4ff);
+  overflow: hidden;
+  border: 1px solid #e1eaf4;
+}
+.practice-hero-copy {
+  padding: 42px 44px;
+}
+.practice-hero h1 {
+  font-size: clamp(28px, 3vw, 42px);
+  line-height: 1.45;
+  letter-spacing: -1.5px;
+  color: #2d4261;
+  margin: 12px 0 18px;
+}
+.practice-intro {
+  font-size: 14px;
+  color: #7d8fa6;
+}
+.practice-actions {
+  display: flex;
+  align-items: center;
+  gap: 24px;
+  flex-wrap: wrap;
+  margin: 26px 0;
+}
+.practice-secondary {
+  display: flex;
+  gap: 10px;
+  align-items: center;
+  font-size: 13px;
+  color: #657e9e;
+}
+.practice-hero-meta {
+  display: flex;
+  gap: 22px;
+  flex-wrap: wrap;
+  font-size: 11px;
+  color: #8b9db3;
+}
+.practice-hero-meta strong {
+  font:
+    600 16px ui-monospace,
+    monospace;
+  color: #566f92;
+}
+.practice-hero-art {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 20px 28px 20px 0;
+}
+.practice-hero-art img {
+  display: block;
+  width: 100%;
+  max-width: 460px;
+}
+.practice-announcements {
+  display: grid;
+  grid-template-columns: 135px repeat(3, minmax(0, 1fr));
+  gap: 18px;
+  padding: 8px 0;
+  align-items: center;
+}
+.announcements-label {
+  display: grid;
+  grid-template-columns: 18px 1fr;
+  gap: 5px 8px;
+  font-size: 13px;
+  color: #657e9e;
+}
+.announcements-label > span {
+  grid-column: 2;
+  font-size: 10px;
+  color: #9cabbc;
+}
+.practice-announcements button {
+  border: 0;
+  background: none;
+  text-align: left;
+  display: grid;
+  grid-template-columns: 1fr 18px;
+  gap: 5px;
+  padding: 8px 18px;
+  border-left: 1px solid #dce4ef;
+  min-width: 0;
+  color: #455e80;
+}
+.practice-announcements time {
+  grid-column: 1/-1;
+  font:
+    11px ui-monospace,
+    monospace;
+  color: #96a5b8;
+}
+.practice-announcements button > span {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  font-size: 12px;
+}
+.practice-announcements button:hover {
+  color: var(--blue);
+}
+.practice-activity,
+.practice-library {
+  display: grid;
+  grid-template-columns: minmax(0, 1.65fr) minmax(320px, 1fr);
+  gap: 24px;
+}
+.activity-totals {
+  display: flex;
+  justify-content: space-between;
+  gap: 18px;
+  margin: 8px 0 22px;
+}
+.activity-totals > div {
+  display: grid;
+  gap: 8px;
+}
+.activity-totals span {
+  color: #91a0b5;
+  font-size: 11px;
+}
+.activity-totals strong {
+  color: #455e80;
+  font:
+    600 30px ui-monospace,
+    monospace;
+}
+.activity-totals small {
+  font:
+    11px 'Microsoft YaHei',
+    sans-serif;
+  color: #9aacbf;
+  margin-left: 7px;
+}
+.activity-totals strong.activity-period {
+  font-size: 17px;
+  margin-top: 10px;
+}
+.activity-panel :deep(.submission-chart) {
+  padding-top: 6px;
+}
+.practice-library-note {
+  display: flex;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 10px;
+  padding-top: 18px;
+  font-size: 11px;
+  color: #9cabbc;
+}
+.practice-library-note a {
+  color: var(--blue);
+}
+.practice-rank-row {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 16px 0;
+  border-bottom: 1px solid var(--line);
+}
+.practice-rank-row:last-child {
+  border-bottom: 0;
+}
+.rank-index {
+  font:
+    11px ui-monospace,
+    monospace;
+  color: #a6b4c6;
+}
+.practice-rank-row .avatar {
+  width: 34px;
+  height: 34px;
+  border-radius: 10px;
+}
+.practice-rank-row > div {
+  min-width: 0;
+}
+.practice-rank-row strong {
+  font-size: 13px;
+  font-weight: 600;
+}
+.practice-rank-row p {
+  font-size: 10px;
+  color: #9cabbc;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+.rank-solved {
+  margin-left: auto;
+  display: grid;
+  text-align: right;
+  gap: 2px;
+}
+.rank-solved strong {
+  font:
+    600 18px ui-monospace,
+    monospace;
+  color: #4995e5;
+}
+.rank-solved small {
+  font-size: 9px;
+  color: #9cabbc;
+}
+.section-title {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 18px;
+  margin: 8px 0 20px;
+}
+.section-title h2 {
+  font-size: 23px;
+  font-weight: 600;
+  color: #354c6e;
+}
+.section-title > a {
+  font-size: 12px;
+  color: var(--blue);
+}
+.practice-contest-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 20px;
+}
+.practice-contest-card {
+  position: relative;
+  display: block;
+  padding: 26px;
+  background: #fff;
+  border: 1px solid #e1eaf4;
+  border-radius: 16px;
+}
+.practice-contest-card > div {
+  display: flex;
+  justify-content: space-between;
+  font-size: 11px;
+  color: #8e9eb3;
+}
+.practice-contest-card h3 {
+  font-size: 16px;
+  font-weight: 600;
+  line-height: 1.6;
+  margin: 22px 0 12px;
+  color: #455e80;
+}
+.practice-contest-card p {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 11px;
+  color: #91a0b5;
+}
+.contest-enter {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-top: 25px;
+  font-size: 12px;
+  color: var(--blue);
+}
+.practice-demo-note {
+  margin-top: 12px;
+  font-size: 10px;
+  color: #9cabbc;
+}
+.practice-links {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 24px;
+  padding: 22px 0 4px;
+  border-top: 1px solid #dce4ef;
+  font-size: 12px;
+}
+.practice-links > span {
+  margin-right: auto;
+  color: #91a0b5;
+}
+.practice-links > a {
+  color: #657e9e;
+}
+@media (max-width: 960px) {
+  .practice-hero-copy {
+    padding: 32px;
+  }
+  .practice-hero-art {
+    padding-right: 10px;
+  }
+  .practice-activity,
+  .practice-library {
+    gap: 18px;
+    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
+  }
+  .practice-announcements {
+    grid-template-columns: 110px repeat(3, minmax(0, 1fr));
+    gap: 6px;
+  }
+  .practice-announcements button {
+    padding: 8px 12px;
+  }
+  .activity-totals strong {
+    font-size: 25px;
+  }
+  .activity-period {
+    display: none;
+  }
+  .practice-contest-card {
+    padding: 20px;
+  }
+}
+@media (max-width: 760px) {
+  .practice-home {
+    gap: 22px;
+  }
+  .practice-hero {
+    grid-template-columns: 1fr;
+  }
+  .practice-hero-copy {
+    padding: 30px 26px 18px;
+  }
+  .practice-hero-art {
+    padding: 0 28px 10px;
+    height: 190px;
+    overflow: hidden;
+  }
+  .practice-hero-art img {
+    max-width: 330px;
+  }
+  .practice-announcements {
+    grid-template-columns: 1fr;
+    gap: 2px;
+  }
+  .announcements-label {
+    display: flex;
+    gap: 8px;
+    margin: 0 0 5px;
+  }
+  .practice-announcements button {
+    grid-template-columns: 46px 1fr 18px;
+    border: 0;
+    padding: 10px 0;
+  }
+  .practice-announcements time {
+    grid-column: auto;
+  }
+  .practice-activity,
+  .practice-library,
+  .practice-contest-grid {
+    grid-template-columns: 1fr;
+  }
+  .section-title h2 {
+    font-size: 20px;
+  }
+  .practice-links {
+    gap: 18px;
+  }
+  .practice-links > span {
+    width: 100%;
+  }
+  .practice-contest-card h3 {
+    margin-top: 16px;
+  }
+  .practice-hero h1 {
+    font-size: 28px;
+  }
+  .activity-totals > div:last-child {
+    display: none;
+  }
+  .activity-totals {
+    justify-content: flex-start;
+    gap: 50px;
+  }
+  .practice-actions {
+    gap: 18px;
+  }
+}
+</style>
diff --git a/frontend/src/views/LogoutView.vue b/frontend/src/views/LogoutView.vue
new file mode 100644
index 0000000..59cc64c
--- /dev/null
+++ b/frontend/src/views/LogoutView.vue
@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import EmptyState from '../components/EmptyState.vue'
+</script>
+<template>
+  <div class="panel" style="max-width: 650px; margin: 50px auto">
+    <EmptyState title="当前没有登录会话" description="账号服务接入后，这里会清除会话并退出登录。"
+      ><RouterLink to="/"><el-button type="primary">返回首页</el-button></RouterLink
+      ><RouterLink to="/login" style="margin-left: 12px"
+        ><el-button>去登录</el-button></RouterLink
+      ></EmptyState
+    >
+  </div>
+</template>
diff --git a/frontend/src/views/NotFoundView.vue b/frontend/src/views/NotFoundView.vue
new file mode 100644
index 0000000..0fbca32
--- /dev/null
+++ b/frontend/src/views/NotFoundView.vue
@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import { ElButton, ElResult } from 'element-plus'
+</script>
+
+<template>
+  <el-result icon="info" title="页面不存在" sub-title="请返回首页继续浏览。">
+    <template #extra>
+      <RouterLink to="/">
+        <el-button type="primary"> 返回首页 </el-button>
+      </RouterLink>
+    </template>
+  </el-result>
+</template>
diff --git a/frontend/src/views/ProblemDetailView.vue b/frontend/src/views/ProblemDetailView.vue
new file mode 100644
index 0000000..6683560
--- /dev/null
+++ b/frontend/src/views/ProblemDetailView.vue
@@ -0,0 +1,520 @@
+<script setup lang="ts">
+import { computed, onBeforeUnmount, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { ElMessage, ElMessageBox } from 'element-plus'
+import { findProblem, discussions, submissions } from '../data/preview'
+import { useCodeDraft, codeTemplates, languageLabels } from '../composables/useCodeDraft'
+import CodeEditor from '../components/CodeEditor.vue'
+import DifficultyTag from '../components/DifficultyTag.vue'
+import VerdictTag from '../components/VerdictTag.vue'
+import EmptyState from '../components/EmptyState.vue'
+import UiIcon from '../components/UiIcon.vue'
+const route = useRoute()
+const id = String(route.params.id)
+const problem = computed(() => findProblem(id))
+const { language, code, state, save } = useCodeDraft(id)
+const theme = ref('vs')
+const fontSize = ref(14)
+const tab = ref('description')
+const testTab = ref('input')
+const testInput = ref(problem.value?.sampleInput ?? '')
+const settingsOpen = ref(false)
+const split = ref(50)
+const workspace = ref<HTMLDivElement>()
+const codeRelated = computed(() => submissions.filter((s) => s.problemId === id))
+const relatedDiscussion = computed(() => discussions.filter((d) => d.problemId === id))
+const draftText = computed(
+  () =>
+    ({
+      initial: '本地草稿',
+      saved: '草稿已保存',
+      changed: '正在保存…',
+      unavailable: '浏览器无法保存草稿',
+    })[state.value],
+)
+let stopDrag: (() => void) | undefined
+function beginDrag(event: PointerEvent) {
+  if (!workspace.value || event.button !== 0) return
+  event.preventDefault()
+  const bounds = workspace.value.getBoundingClientRect()
+  function move(e: PointerEvent) {
+    split.value = Math.max(30, Math.min(70, ((e.clientX - bounds.left) / bounds.width) * 100))
+  }
+  function stop() {
+    window.removeEventListener('pointermove', move)
+    window.removeEventListener('pointerup', stop)
+    stopDrag = undefined
+  }
+  stopDrag?.()
+  window.addEventListener('pointermove', move)
+  window.addEventListener('pointerup', stop, { once: true })
+  stopDrag = stop
+}
+onBeforeUnmount(() => stopDrag?.())
+async function resetCode() {
+  try {
+    await ElMessageBox.confirm('将当前语言的草稿恢复为初始模板？', '重置代码', {
+      confirmButtonText: '重置',
+      cancelButtonText: '保留草稿',
+      type: 'info',
+    })
+    code.value = codeTemplates[language.value]
+  } catch {
+    /* User kept their draft. */
+  }
+}
+function downloadCode() {
+  const extensions = { cpp: 'cpp', python: 'py', rust: 'rs' }
+  const url = URL.createObjectURL(new Blob([code.value], { type: 'text/plain;charset=utf-8' }))
+  const link = document.createElement('a')
+  link.href = url
+  link.download = 'solution-' + id + '.' + extensions[language.value]
+  link.click()
+  setTimeout(() => URL.revokeObjectURL(url), 1000)
+}
+async function copySample(value: string) {
+  try {
+    await navigator.clipboard.writeText(value)
+    ElMessage.success('已复制样例')
+  } catch {
+    ElMessage.info('浏览器暂不支持复制，请选中样例文本复制')
+  }
+}
+</script>
+<template>
+  <div
+    v-if="problem"
+    ref="workspace"
+    class="problem-workspace"
+    :style="{ '--problem-split': split + '%' }"
+  >
+    <section class="panel statement-panel">
+      <el-tabs v-model="tab" class="statement-tabs"
+        ><el-tab-pane label="题目描述" name="description" /><el-tab-pane
+          label="提交记录"
+          name="submissions" /><el-tab-pane label="题解与讨论" name="discussions" /><el-tab-pane
+          label="AI 答疑"
+          name="ai"
+      /></el-tabs>
+      <div class="statement-content">
+        <template v-if="tab === 'description'"
+          ><div class="problem-title-row">
+            <div>
+              <p class="small muted mono">题号 {{ problem.id }}</p>
+              <h1>{{ problem.title }}</h1>
+            </div>
+            <DifficultyTag :value="problem.difficulty" />
+          </div>
+          <div class="tag-list">
+            <span v-for="tag in problem.tags" :key="tag" class="tag">{{ tag }}</span
+            ><span class="tag">示例题面</span>
+          </div>
+          <div class="problem-limits">
+            <span>时间限制：1000 ms</span><span>内存限制：256 MiB</span
+            ><span>标准输入 / 标准输出</span>
+          </div>
+          <div class="detail-prose">
+            <h2>题目描述</h2>
+            <p>{{ problem.description }}</p>
+            <h2>输入格式</h2>
+            <p>{{ problem.input }}</p>
+            <h2>输出格式</h2>
+            <p>{{ problem.output }}</p>
+            <template v-if="problem.sampleInput"
+              ><div class="sample-grid">
+                <div>
+                  <h2>
+                    样例输入
+                    <el-button link size="small" @click="copySample(problem.sampleInput)"
+                      >复制</el-button
+                    >
+                  </h2>
+                  <pre class="sample-block">{{ problem.sampleInput }}</pre>
+                </div>
+                <div>
+                  <h2>
+                    样例输出
+                    <el-button link size="small" @click="copySample(problem.sampleOutput)"
+                      >复制</el-button
+                    >
+                  </h2>
+                  <pre class="sample-block">{{ problem.sampleOutput }}</pre>
+                </div>
+              </div></template
+            >
+            <h2>数据范围与提示</h2>
+            <p>{{ problem.constraint }}</p>
+            <h2>提交说明</h2>
+            <p>
+              使用标准输入读取数据，只输出题目要求的结果。你可以在右侧编写代码，并在下方准备自测输入。
+            </p>
+          </div>
+        </template>
+        <template v-else-if="tab === 'submissions'"
+          ><p class="notice-strip">以下为本题的示例评测记录。</p>
+          <el-table :data="codeRelated" empty-text="暂无本题的示例记录"
+            ><el-table-column label="提交编号" prop="id" width="100" /><el-table-column
+              label="用户"
+              prop="username"
+              min-width="110"
+            /><el-table-column label="结果" width="100"
+              ><template #default="{ row }"
+                ><VerdictTag :value="row.verdict" /></template></el-table-column
+            ><el-table-column label="详情" width="80"
+              ><template #default="{ row }"
+                ><RouterLink :to="'/submissions/' + row.id" class="text-link"
+                  >查看</RouterLink
+                ></template
+              ></el-table-column
+            ></el-table
+          ></template
+        >
+        <template v-else-if="tab === 'discussions'"
+          ><article
+            v-for="discussion in relatedDiscussion"
+            :key="discussion.id"
+            class="discussion-item"
+          >
+            <div>
+              <h2>
+                <RouterLink :to="'/discussions/' + discussion.id">{{
+                  discussion.title
+                }}</RouterLink>
+              </h2>
+              <p>{{ discussion.author }} · {{ discussion.date }} · 示例文章</p>
+            </div>
+          </article>
+          <EmptyState v-if="!relatedDiscussion.length" title="暂无本题讨论" /><RouterLink
+            to="/discussions"
+            class="text-link"
+            >进入讨论社区 →</RouterLink
+          ></template
+        >
+        <EmptyState
+          v-else
+          title="AI 答疑待接入"
+          description="后续结合题目、代码和提交记录，提供逐步提示与针对性分析。"
+        />
+      </div>
+    </section>
+    <button
+      class="pane-splitter"
+      role="separator"
+      aria-label="调整题面与编辑器宽度"
+      aria-orientation="vertical"
+      :aria-valuenow="Math.round(split)"
+      aria-valuemin="30"
+      aria-valuemax="70"
+      @pointerdown="beginDrag"
+      @keydown.left.prevent="split = Math.max(30, split - 2)"
+      @keydown.right.prevent="split = Math.min(70, split + 2)"
+    />
+    <section class="panel editor-panel">
+      <header class="editor-toolbar">
+        <span class="small muted">语言</span
+        ><el-select v-model="language" aria-label="编程语言" size="small"
+          ><el-option
+            v-for="(label, value) in languageLabels"
+            :key="value"
+            :label="label"
+            :value="value" /></el-select
+        ><el-tooltip content="重置模板"
+          ><el-button size="small" aria-label="重置代码模板" @click="resetCode"
+            ><UiIcon name="refresh" /></el-button></el-tooltip
+        ><span class="draft-label" aria-live="polite">{{ draftText }}</span
+        ><el-button size="small" aria-label="下载代码" @click="downloadCode"
+          ><UiIcon name="document" /></el-button
+        ><el-popover v-model:visible="settingsOpen" trigger="click" width="240"
+          ><template #reference
+            ><el-button size="small" aria-label="编辑器设置"><UiIcon name="settings" /></el-button
+          ></template>
+          <div class="editor-settings">
+            <label>主题</label
+            ><el-select v-model="theme" aria-label="编辑器主题"
+              ><el-option label="浅色" value="vs" /><el-option
+                label="深色"
+                value="vs-dark" /></el-select
+            ><label>字号</label><el-slider v-model="fontSize" :min="12" :max="22" show-input /></div
+        ></el-popover>
+      </header>
+      <div class="editor-area">
+        <CodeEditor v-model="code" :language="language" :theme="theme" :font-size="fontSize" />
+      </div>
+      <div class="editor-testing">
+        <el-tabs v-model="testTab"
+          ><el-tab-pane label="自测输入" name="input"
+            ><el-input
+              v-model="testInput"
+              type="textarea"
+              :rows="3"
+              resize="none"
+              placeholder="输入自测数据"
+              aria-label="自测输入"
+            /><el-button
+              v-if="problem.sampleInput"
+              link
+              type="primary"
+              size="small"
+              @click="testInput = problem.sampleInput"
+              >填入题目样例</el-button
+            ></el-tab-pane
+          ><el-tab-pane label="运行结果" name="result"
+            ><p class="test-result-placeholder">
+              尚未运行。判题服务接入后展示标准输出、错误信息与资源使用情况。
+            </p></el-tab-pane
+          ></el-tabs
+        >
+      </div>
+      <footer class="editor-buttons">
+        <span class="small muted">评测服务待接入</span
+        ><el-button size="small" @click="save">保存草稿</el-button
+        ><el-button size="small" type="success" plain disabled>自测运行</el-button
+        ><el-button size="small" type="primary" disabled>提交代码</el-button>
+      </footer>
+    </section>
+  </div>
+  <EmptyState v-else title="题目不存在"
+    ><RouterLink to="/problems"><el-button>返回题库</el-button></RouterLink></EmptyState
+  >
+</template>
+<style>
+.app-main:has(.problem-workspace) {
+  width: calc(100% - 48px);
+  max-width: 1900px;
+  margin: 20px auto;
+}
+.app-shell:has(.problem-workspace) .app-footer {
+  display: none;
+}
+.problem-workspace {
+  display: grid;
+  grid-template-columns: minmax(0, var(--problem-split)) 12px minmax(0, 1fr);
+  height: calc(100dvh - 117px);
+  min-height: 600px;
+}
+.statement-panel,
+.editor-panel {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  border-radius: 14px;
+}
+.statement-tabs {
+  padding: 8px 20px 0;
+  background: #fff;
+  border-bottom: 1px solid #edf0f5;
+}
+.statement-tabs .el-tabs__header {
+  margin: 0;
+}
+.statement-tabs .el-tabs__active-bar,
+.statement-tabs .el-tabs__nav-wrap::after {
+  display: none;
+}
+.statement-tabs .el-tabs__item {
+  font-size: 12px;
+  height: 36px;
+  padding: 0 12px;
+  margin: 0 4px 8px 0;
+  border-radius: 7px;
+}
+.statement-tabs .el-tabs__item.is-active {
+  background: #edf6ff;
+}
+.statement-content {
+  padding: 30px;
+  overflow: auto;
+  flex: 1;
+}
+.problem-title-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 15px;
+}
+.problem-title-row h1 {
+  font-size: 27px;
+  font-weight: 650;
+  letter-spacing: -0.6px;
+  margin-top: 6px;
+}
+.problem-limits {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px 20px;
+  margin: 20px 0;
+  padding: 16px 18px;
+  background: #f3f7fc;
+  border: 0;
+  border-radius: 10px;
+  font-size: 12px;
+  color: #8b9cb2;
+}
+.statement-content .detail-prose h2 {
+  font-size: 16px;
+  color: #455e80;
+  border-left: 3px solid #b5d5f7;
+  padding-left: 12px;
+  margin: 25px 0 12px;
+}
+.statement-content .detail-prose {
+  font-size: 13px;
+  line-height: 1.9;
+}
+.sample-grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 18px;
+}
+.sample-grid h2 {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+.pane-splitter {
+  background: none;
+  border: 0;
+  cursor: col-resize;
+  position: relative;
+  padding: 0;
+  touch-action: none;
+}
+.pane-splitter::after {
+  content: '';
+  width: 3px;
+  height: 32px;
+  background: #9eb7d7;
+  border-radius: 3px;
+  position: absolute;
+  left: 4px;
+  top: 48%;
+}
+.pane-splitter:hover {
+  background: #e0eaff;
+}
+.editor-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 12px 18px;
+  background: #f8fafd;
+  border-bottom: 1px solid #e4ebf4;
+  min-height: 61px;
+}
+.editor-toolbar .el-select {
+  width: 120px;
+}
+.draft-label {
+  font-size: 11px;
+  color: #9aabc0;
+  margin-left: auto;
+}
+.editor-area {
+  flex: 1;
+  min-height: 320px;
+  overflow: hidden;
+}
+.editor-testing {
+  padding: 6px 18px 15px;
+  background: #f8fafd;
+  border-top: 1px solid #e4ebf4;
+  min-height: 161px;
+}
+.editor-testing .el-tabs__header {
+  margin-bottom: 12px;
+}
+.editor-testing .el-tabs__item {
+  font-size: 12px;
+  height: 38px;
+}
+.test-result-placeholder {
+  font-size: 12px;
+  color: #93a4ba;
+  padding: 16px 0;
+  min-height: 90px;
+}
+.editor-buttons {
+  border-top: 1px solid #edf0f5;
+  display: flex;
+  gap: 8px;
+  align-items: center;
+  padding: 14px 18px;
+  min-height: 55px;
+}
+.editor-buttons > span {
+  margin-right: auto;
+}
+.editor-settings {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  font-size: 12px;
+}
+@media (max-width: 960px) {
+  .draft-label {
+    display: none;
+  }
+  .statement-content {
+    padding: 22px;
+  }
+  .problem-title-row h1 {
+    font-size: 24px;
+  }
+  .editor-toolbar {
+    padding: 10px;
+  }
+  .editor-buttons {
+    padding: 10px;
+    gap: 5px;
+  }
+  .editor-buttons > span {
+    font-size: 10px;
+  }
+  .sample-grid {
+    grid-template-columns: 1fr;
+  }
+  .statement-tabs .el-tabs__item {
+    padding: 0 10px;
+  }
+}
+@media (max-width: 760px) {
+  .problem-workspace {
+    display: flex;
+    flex-direction: column;
+    height: auto;
+    gap: 16px;
+    min-height: 0;
+  }
+  .pane-splitter {
+    display: none;
+  }
+  .statement-content {
+    overflow: visible;
+  }
+  .editor-area {
+    height: 470px;
+    flex: none;
+  }
+  .editor-panel {
+    min-height: 700px;
+  }
+  .editor-buttons {
+    flex-wrap: wrap;
+  }
+  .editor-buttons > span {
+    width: 100%;
+    font-size: 11px;
+  }
+  .sample-grid {
+    grid-template-columns: 1fr 1fr;
+  }
+  .statement-content {
+    padding: 22px;
+  }
+  .app-main:has(.problem-workspace) {
+    width: calc(100% - 24px);
+    margin-top: 14px;
+  }
+}
+</style>
diff --git a/frontend/src/views/ProblemsView.vue b/frontend/src/views/ProblemsView.vue
new file mode 100644
index 0000000..51ae338
--- /dev/null
+++ b/frontend/src/views/ProblemsView.vue
@@ -0,0 +1,62 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { problems, problemTags } from '../data/preview'
+import { usePagination } from '../composables/usePagination'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+const route = useRoute()
+const query = ref('')
+const difficulty = ref('')
+const tag = ref(typeof route.query.tag === 'string' ? route.query.tag : '')
+const filtered = computed(() =>
+  problems.filter(
+    (p) =>
+      (!query.value || (p.id + p.title).toLowerCase().includes(query.value.trim().toLowerCase())) &&
+      (!difficulty.value || p.difficulty === difficulty.value) &&
+      (!tag.value || p.tags.includes(tag.value)),
+  ),
+)
+const { page, pageSize, paged, total } = usePagination(filtered)
+function reset() {
+  query.value = ''
+  difficulty.value = ''
+  tag.value = ''
+}
+</script>
+<template>
+  <PageHeading title="题库" eyebrow="PROBLEM BANK" description="挑选一道题，开始今天的练习。"
+    ><RouterLink to="/trainings"><el-button>按题单练习</el-button></RouterLink></PageHeading
+  >
+  <PanelCard title="全部题目" icon="problems" subtitle="示例题库">
+    <div class="filters">
+      <el-input
+        v-model="query"
+        placeholder="搜索题号或题目名称"
+        aria-label="搜索题目"
+        clearable
+      /><el-select v-model="difficulty" placeholder="全部难度" aria-label="难度" clearable
+        ><el-option
+          v-for="d in ['入门', '简单', '中等', '困难']"
+          :key="d"
+          :label="d"
+          :value="d" /></el-select
+      ><el-select v-model="tag" placeholder="全部标签" aria-label="题目标签" clearable filterable
+        ><el-option v-for="t in problemTags" :key="t" :label="t" :value="t" /></el-select
+      ><el-button @click="reset">重置</el-button
+      ><span class="filter-label">{{ total }} 道题目</span>
+    </div>
+    <ProblemTable :items="paged" />
+    <div class="pagination-row">
+      <span class="muted">共 {{ total }} 道题目</span
+      ><el-pagination
+        v-model:current-page="page"
+        v-model:page-size="pageSize"
+        :page-sizes="[5, 10, 20]"
+        :total="total"
+        layout="prev, pager, next, sizes"
+      />
+    </div>
+  </PanelCard>
+</template>
diff --git a/frontend/src/views/ProfileView.vue b/frontend/src/views/ProfileView.vue
new file mode 100644
index 0000000..f310ba8
--- /dev/null
+++ b/frontend/src/views/ProfileView.vue
@@ -0,0 +1,105 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { rankings, submissions, problems } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import SubmissionTable from '../components/SubmissionTable.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const user = computed(() => rankings.find((u) => u.username === route.params.username))
+const tab = ref('activity')
+const records = computed(() => submissions.filter((s) => s.username === user.value?.username))
+const solved = computed(() =>
+  problems.filter((p) => records.value.some((s) => s.problemId === p.id && s.verdict === 'AC')),
+)
+const activity = Array.from({ length: 140 }, (_, index) =>
+  index % 11 === 0 ? 4 : index % 7 === 0 ? 3 : index % 3 === 0 ? 2 : index % 2 === 0 ? 1 : 0,
+)
+</script>
+<template>
+  <template v-if="user"
+    ><div class="profile-banner">
+      <span class="avatar" :style="{ background: user.color }">{{ user.username[0] }}</span>
+      <div>
+        <p class="eyebrow">PERSONAL PROFILE · 示例用户</p>
+        <h1>{{ user.username }}</h1>
+        <p>{{ user.motto }}</p>
+        <div class="profile-tags">
+          <span class="tag">算法爱好者</span><span class="tag">持续练习</span>
+        </div>
+      </div>
+      <div class="profile-actions">
+        <RouterLink :to="{ path: '/submissions', query: { user: user.username } }"
+          ><el-button>查看提交</el-button></RouterLink
+        ><el-button disabled>关注</el-button>
+      </div>
+    </div>
+    <div class="summary-grid">
+      <div class="summary-card">
+        <p>已通过题目</p>
+        <strong>{{ user.solved }}</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>总提交数</p>
+        <strong>{{ user.submissions }}</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>通过率</p>
+        <strong>{{ Math.round((user.solved / user.submissions) * 100) }}%</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>竞赛积分</p>
+        <strong>{{ user.rating }}</strong
+        ><small>示例积分</small>
+      </div>
+    </div>
+    <div class="content-with-aside">
+      <PanelCard title="练习记录" icon="rankings"
+        ><el-tabs v-model="tab"
+          ><el-tab-pane label="提交活动" name="activity"
+            ><p class="small muted">提交活动热力图 · 布局示例</p>
+            <div class="heatmap" role="img" aria-label="示例提交活动热力图">
+              <span
+                v-for="(level, index) in activity"
+                :key="index"
+                class="heat-cell"
+                :data-level="level"
+              />
+            </div>
+            <div class="detail-meta"><span>少</span><span>← 提交活跃度 →</span><span>多</span></div>
+            <SubmissionTable :items="records" compact /></el-tab-pane
+          ><el-tab-pane label="已通过题目" name="problems"
+            ><p class="tab-summary">以下题目来自当前示例提交记录。</p>
+            <ProblemTable :items="solved" compact /></el-tab-pane></el-tabs
+      ></PanelCard>
+      <div class="stack">
+        <PanelCard title="个人介绍" icon="about"
+          ><p class="small muted">{{ user.motto }}</p>
+          <dl class="details-list" style="margin-top: 20px">
+            <div>
+              <dt>用户名</dt>
+              <dd>{{ user.username }}</dd>
+            </div>
+            <div>
+              <dt>榜单位置</dt>
+              <dd>#{{ rankings.indexOf(user) + 1 }}</dd>
+            </div>
+          </dl></PanelCard
+        ><PanelCard title="学习分析" icon="reading"
+          ><p class="small muted">
+            后续结合历史代码、提交结果和题目标签，分析练习情况并生成个性化训练建议。
+          </p>
+          <el-button disabled style="margin-top: 18px; width: 100%"
+            >分析服务待接入</el-button
+          ></PanelCard
+        >
+      </div>
+    </div></template
+  ><EmptyState v-else title="用户不存在"
+    ><RouterLink to="/rankings"><el-button>查看排行榜</el-button></RouterLink></EmptyState
+  >
+</template>
diff --git a/frontend/src/views/RankingsView.vue b/frontend/src/views/RankingsView.vue
new file mode 100644
index 0000000..bdae973
--- /dev/null
+++ b/frontend/src/views/RankingsView.vue
@@ -0,0 +1,67 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { rankings } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import PageHeading from '../components/PageHeading.vue'
+const search = ref('')
+const order = ref('solved')
+const items = computed(() =>
+  [...rankings]
+    .sort((a, b) => (order.value === 'solved' ? b.solved - a.solved : b.rating - a.rating))
+    .map((user, index) => ({ ...user, rank: index + 1 }))
+    .filter((u) => u.username.toLowerCase().includes(search.value.trim().toLowerCase())),
+)
+</script>
+<template>
+  <PageHeading title="总排名" eyebrow="RANKINGS" description="保持练习，让每一道题都成为积累。" />
+  <div class="summary-grid">
+    <div v-for="(user, index) in rankings.slice(0, 3)" :key="user.username" class="summary-card">
+      <p>NO. {{ index + 1 }} · 示例过题榜</p>
+      <strong style="font-size: 23px"
+        ><RouterLink :to="'/users/' + user.username">{{ user.username }}</RouterLink></strong
+      ><small>{{ user.solved }} 道已通过 · {{ user.motto }}</small>
+    </div>
+    <div class="summary-card">
+      <p>榜单规则</p>
+      <strong style="font-size: 21px">持续进步</strong><small>默认按照通过题目数排序</small>
+    </div>
+  </div>
+  <PanelCard title="排行榜" icon="rankings" subtitle="示例排名"
+    ><div class="filters">
+      <el-input
+        v-model="search"
+        placeholder="搜索用户"
+        aria-label="搜索排名用户"
+        clearable
+      /><el-radio-group v-model="order"
+        ><el-radio-button value="solved">过题数</el-radio-button
+        ><el-radio-button value="rating">竞赛积分</el-radio-button></el-radio-group
+      >
+    </div>
+    <el-table :data="items" stripe empty-text="没有找到用户"
+      ><el-table-column label="排名" width="80" align="center"
+        ><template #default="{ row }"
+          ><span class="number-medal" :class="'top-' + row.rank">{{ row.rank }}</span></template
+        ></el-table-column
+      ><el-table-column label="用户" min-width="170"
+        ><template #default="{ row }"
+          ><RouterLink :to="'/users/' + row.username" class="user-inline table-link"
+            ><span class="avatar" :style="{ background: row.color }">{{ row.username[0] }}</span
+            >{{ row.username }}</RouterLink
+          ></template
+        ></el-table-column
+      ><el-table-column label="个人签名" prop="motto" min-width="200" /><el-table-column
+        label="通过题目"
+        prop="solved"
+        width="120"
+        align="right" /><el-table-column
+        label="总提交"
+        prop="submissions"
+        width="110"
+        align="right" /><el-table-column
+        label="竞赛积分"
+        prop="rating"
+        width="110"
+        align="right" /></el-table
+  ></PanelCard>
+</template>
diff --git a/frontend/src/views/SubmissionDetailView.vue b/frontend/src/views/SubmissionDetailView.vue
new file mode 100644
index 0000000..a2e9f1e
--- /dev/null
+++ b/frontend/src/views/SubmissionDetailView.vue
@@ -0,0 +1,63 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import { submissions, findProblem } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import VerdictTag from '../components/VerdictTag.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const submission = computed(() => submissions.find((s) => s.id === route.params.id))
+</script>
+<template>
+  <template v-if="submission"
+    ><div class="breadcrumbs">
+      <RouterLink to="/submissions">评测记录</RouterLink><span>/</span
+      ><span>#{{ submission.id }}</span>
+    </div>
+    <PageHeading
+      :title="'提交 #' + submission.id"
+      :description="findProblem(submission.problemId)?.title"
+      ><VerdictTag :value="submission.verdict" full
+    /></PageHeading>
+    <div class="summary-grid">
+      <div class="summary-card">
+        <p>运行时间</p>
+        <strong
+          >{{ submission.time ?? '—' }} <small v-if="submission.time !== null">ms</small></strong
+        ><small>示例数据</small>
+      </div>
+      <div class="summary-card">
+        <p>内存使用</p>
+        <strong
+          >{{ submission.memory === null ? '—' : submission.memory / 1024 }}
+          <small v-if="submission.memory !== null">MiB</small></strong
+        ><small>示例数据</small>
+      </div>
+      <div class="summary-card">
+        <p>语言</p>
+        <strong>{{ submission.language }}</strong
+        ><small>工具链版本待接入</small>
+      </div>
+      <div class="summary-card">
+        <p>提交用户</p>
+        <strong style="font-size: 21px"
+          ><RouterLink :to="'/users/' + submission.username">{{
+            submission.username
+          }}</RouterLink></strong
+        ><small>{{ submission.created }}</small>
+      </div>
+    </div>
+    <PanelCard title="评测详情" icon="submissions"
+      ><p class="notice-strip">当前展示评测界面的示例记录，实际用例结果、日志和源码尚未接入。</p>
+      <EmptyState
+        title="用例详情待接入"
+        description="评测完成后展示各测试点状态、资源用量及可见的编译信息。"
+      /><RouterLink :to="'/problems/' + submission.problemId"
+        ><el-button>返回题目</el-button></RouterLink
+      ></PanelCard
+    ></template
+  ><EmptyState v-else title="提交记录不存在"
+    ><RouterLink to="/submissions"><el-button>返回评测列表</el-button></RouterLink></EmptyState
+  >
+</template>
diff --git a/frontend/src/views/SubmissionsView.vue b/frontend/src/views/SubmissionsView.vue
new file mode 100644
index 0000000..9b39f10
--- /dev/null
+++ b/frontend/src/views/SubmissionsView.vue
@@ -0,0 +1,75 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { submissions, verdictLabels, type Verdict } from '../data/preview'
+import { usePagination } from '../composables/usePagination'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import SubmissionTable from '../components/SubmissionTable.vue'
+const route = useRoute()
+const username = ref(typeof route.query.user === 'string' ? route.query.user : '')
+const problemId = ref('')
+const language = ref('')
+const verdict = ref<Verdict | ''>('')
+const filtered = computed(() =>
+  submissions.filter(
+    (s) =>
+      (!username.value || s.username.toLowerCase().includes(username.value.trim().toLowerCase())) &&
+      (!problemId.value || s.problemId.includes(problemId.value.trim())) &&
+      (!language.value || s.language === language.value) &&
+      (!verdict.value || s.verdict === verdict.value),
+  ),
+)
+const { page, pageSize, paged, total } = usePagination(filtered)
+function reset() {
+  username.value = ''
+  problemId.value = ''
+  language.value = ''
+  verdict.value = ''
+}
+</script>
+<template>
+  <PageHeading
+    title="评测记录"
+    eyebrow="SUBMISSIONS"
+    description="查看提交状态、运行情况与评测结果。"
+  /><PanelCard title="提交列表" icon="submissions" subtitle="示例评测记录"
+    ><div class="filters">
+      <el-input
+        v-model="username"
+        placeholder="用户名"
+        aria-label="筛选用户名"
+        clearable
+        style="width: 180px"
+      /><el-input
+        v-model="problemId"
+        placeholder="题号"
+        aria-label="筛选题号"
+        clearable
+        style="width: 150px"
+      /><el-select v-model="verdict" aria-label="评测结果" placeholder="全部结果" clearable
+        ><el-option
+          v-for="(label, value) in verdictLabels"
+          :key="value"
+          :label="label"
+          :value="value" /></el-select
+      ><el-select v-model="language" aria-label="语言" placeholder="全部语言" clearable
+        ><el-option
+          v-for="l in ['C++', 'Python', 'Rust']"
+          :key="l"
+          :label="l"
+          :value="l" /></el-select
+      ><el-button @click="reset">重置</el-button>
+    </div>
+    <SubmissionTable :items="paged" />
+    <div class="pagination-row">
+      <span>{{ total }} 条记录</span
+      ><el-pagination
+        v-model:current-page="page"
+        v-model:page-size="pageSize"
+        :page-sizes="[5, 10, 20]"
+        :total="total"
+        layout="prev, pager, next, sizes"
+      /></div
+  ></PanelCard>
+</template>
diff --git a/frontend/src/views/TeamsView.vue b/frontend/src/views/TeamsView.vue
new file mode 100644
index 0000000..b1a2cb0
--- /dev/null
+++ b/frontend/src/views/TeamsView.vue
@@ -0,0 +1,61 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import PageHeading from '../components/PageHeading.vue'
+const query = ref('')
+const teams = [
+  {
+    name: 'KF 算法研习组',
+    initials: 'KF',
+    description: '一起练习基础算法，分享解题笔记。',
+    members: 12,
+    tags: ['基础训练', '算法交流'],
+  },
+  {
+    name: 'Rust 解题小队',
+    initials: 'RS',
+    description: '用 Rust 完成题目，交流语言与算法的使用经验。',
+    members: 8,
+    tags: ['Rust', '专题练习'],
+  },
+  {
+    name: '周末练习伙伴',
+    initials: 'AC',
+    description: '每周留一点时间，认真做几道题。',
+    members: 16,
+    tags: ['练习赛', '学习打卡'],
+  },
+]
+const items = computed(() =>
+  teams.filter((t) => t.name.toLowerCase().includes(query.value.toLowerCase())),
+)
+</script>
+<template>
+  <PageHeading title="团队" eyebrow="TEAMS" description="找到一起练习和交流的伙伴。"
+    ><RouterLink to="/teams/create"
+      ><el-button type="primary">创建团队</el-button></RouterLink
+    ></PageHeading
+  >
+  <div class="filters">
+    <el-input v-model="query" placeholder="搜索团队" aria-label="搜索团队" clearable /><span
+      class="filter-label"
+      >示例团队 · 加入功能待接入</span
+    >
+  </div>
+  <div class="card-grid">
+    <article v-for="team in items" :key="team.name" class="panel team-card">
+      <span class="team-logo">{{ team.initials }}</span>
+      <div style="flex: 1">
+        <h2>{{ team.name }}</h2>
+        <p>{{ team.description }}</p>
+        <div class="tag-list">
+          <span v-for="tag in team.tags" :key="tag" class="tag">{{ tag }}</span>
+        </div>
+        <div class="card-meta" style="margin-top: 20px">
+          <span>{{ team.members }} 名成员 · 示例</span
+          ><el-button disabled size="small" style="margin-left: auto">申请加入</el-button>
+        </div>
+      </div>
+    </article>
+  </div>
+  <el-empty v-if="!items.length" description="没有找到团队" />
+</template>
diff --git a/frontend/src/views/TrainingDetailView.vue b/frontend/src/views/TrainingDetailView.vue
new file mode 100644
index 0000000..b77c9be
--- /dev/null
+++ b/frontend/src/views/TrainingDetailView.vue
@@ -0,0 +1,59 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import { trainings, problems } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import PageHeading from '../components/PageHeading.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const training = computed(() => trainings.find((t) => t.id === route.params.id))
+const items = computed(() => problems.filter((p) => training.value?.ids.includes(p.id)))
+</script>
+<template>
+  <template v-if="training"
+    ><div class="breadcrumbs">
+      <RouterLink to="/trainings">训练</RouterLink><span>/</span
+      ><span>{{ training.category }}</span>
+    </div>
+    <PageHeading :title="training.title" :description="training.description"
+      ><RouterLink v-if="items[0]" :to="'/problems/' + items[0].id"
+        ><el-button type="primary">从第一题开始</el-button></RouterLink
+      ></PageHeading
+    >
+    <div class="content-with-aside">
+      <PanelCard title="训练题目" icon="problems" subtitle="按顺序练习"
+        ><ProblemTable :items="items" compact
+      /></PanelCard>
+      <div class="stack">
+        <PanelCard title="题单信息" icon="trainings"
+          ><dl class="details-list">
+            <div>
+              <dt>分类</dt>
+              <dd>{{ training.category }}</dd>
+            </div>
+            <div>
+              <dt>难度</dt>
+              <dd>{{ training.level }}</dd>
+            </div>
+            <div>
+              <dt>题目数量</dt>
+              <dd>{{ items.length }} 道</dd>
+            </div>
+            <div>
+              <dt>训练记录</dt>
+              <dd>账号服务接入后开启</dd>
+            </div>
+          </dl></PanelCard
+        ><PanelCard title="练习建议" icon="reading"
+          ><p class="small muted">
+            先写出自己的解题思路，检查数据范围和边界情况。完成后回顾代码，记录遇到的问题。
+          </p>
+          <RouterLink to="/discussions" class="text-link">去讨论区交流 →</RouterLink></PanelCard
+        >
+      </div>
+    </div></template
+  ><EmptyState v-else title="题单不存在"
+    ><RouterLink to="/trainings"><el-button>返回训练列表</el-button></RouterLink></EmptyState
+  >
+</template>
diff --git a/frontend/src/views/TrainingsView.vue b/frontend/src/views/TrainingsView.vue
new file mode 100644
index 0000000..482765e
--- /dev/null
+++ b/frontend/src/views/TrainingsView.vue
@@ -0,0 +1,55 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { trainings } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import DifficultyTag from '../components/DifficultyTag.vue'
+const category = ref('全部')
+const query = ref('')
+const items = computed(() =>
+  trainings.filter(
+    (t) =>
+      (category.value === '全部' || t.category === category.value) && t.title.includes(query.value),
+  ),
+)
+</script>
+<template>
+  <PageHeading title="训练计划" eyebrow="TRAINING" description="从基础到专题，让练习更有顺序。" />
+  <div class="intro-banner">
+    <div>
+      <p class="eyebrow">ONE STEP AT A TIME</p>
+      <h2>循序渐进，把知识点练扎实。</h2>
+      <p>选择适合自己的题单，先理解问题，再尝试独立完成。训练记录将在账号与评测服务接入后开启。</p>
+    </div>
+    <span class="intro-number">{ }</span>
+  </div>
+  <div class="filters">
+    <el-radio-group v-model="category"
+      ><el-radio-button
+        v-for="c in ['全部', '基础入门', '算法专题', '进阶练习']"
+        :key="c"
+        :value="c"
+        >{{ c }}</el-radio-button
+      ></el-radio-group
+    ><el-input v-model="query" placeholder="搜索训练题单" aria-label="搜索训练" clearable />
+  </div>
+  <div class="card-grid">
+    <article v-for="training in items" :key="training.id" class="training-card">
+      <div class="training-illustration" :class="training.color">{{ training.icon }}</div>
+      <div style="flex: 1">
+        <div class="tag-list">
+          <span class="tag">{{ training.category }}</span
+          ><DifficultyTag :value="training.level" />
+        </div>
+        <h2>
+          <RouterLink :to="'/trainings/' + training.id">{{ training.title }}</RouterLink>
+        </h2>
+        <p>{{ training.description }}</p>
+        <div class="card-meta">
+          <span>{{ training.ids.length }} 道题目</span><span>示例题单</span
+          ><RouterLink class="text-link" :to="'/trainings/' + training.id">开始训练 →</RouterLink>
+        </div>
+      </div>
+    </article>
+  </div>
+  <el-empty v-if="!items.length" description="没有符合条件的训练" />
+</template>
diff --git a/frontend/tests/useCodeDraft.test.ts b/frontend/tests/useCodeDraft.test.ts
new file mode 100644
index 0000000..b2cc75a
--- /dev/null
+++ b/frontend/tests/useCodeDraft.test.ts
@@ -0,0 +1,164 @@
+import assert from 'node:assert/strict'
+import { test, type TestContext } from 'node:test'
+import { effectScope, nextTick } from 'vue'
+import { codeTemplates, useCodeDraft, type Language } from '../src/composables/useCodeDraft.ts'
+
+type SavedDraft = { version: number; language: Language; drafts: Record<Language, string> }
+
+function browser(t: TestContext) {
+  const page = new EventTarget()
+  const document = Object.assign(new EventTarget(), {
+    visibilityState: 'visible' as DocumentVisibilityState,
+  })
+  const storage = {
+    items: new Map<string, string>(),
+    writes: 0,
+    failWrites: false,
+    getItem(key: string) {
+      return this.items.get(key) ?? null
+    },
+    setItem(key: string, value: string) {
+      this.writes++
+      if (this.failWrites) throw new Error('Storage unavailable')
+      this.items.set(key, value)
+    },
+  }
+  const globals = { window: page, document, localStorage: storage }
+  const descriptors = Object.keys(globals).map(
+    (name) => [name, Object.getOwnPropertyDescriptor(globalThis, name)] as const,
+  )
+  for (const [name, value] of Object.entries(globals)) {
+    Object.defineProperty(globalThis, name, { configurable: true, writable: true, value })
+  }
+  t.mock.timers.enable({ apis: ['setTimeout'] })
+  const scopes: ReturnType<typeof effectScope>[] = []
+  t.after(() => {
+    for (const scope of scopes) scope.stop()
+    for (const [name, descriptor] of descriptors) {
+      if (descriptor) Object.defineProperty(globalThis, name, descriptor)
+      else Reflect.deleteProperty(globalThis, name)
+    }
+  })
+  return {
+    page,
+    document,
+    storage,
+    open(problemId = '1001') {
+      const scope = effectScope()
+      scopes.push(scope)
+      return { scope, ...scope.run(() => useCodeDraft(problemId))! }
+    },
+    read(problemId = '1001'): SavedDraft | null {
+      return JSON.parse(storage.getItem('kf-oj:code-draft:' + problemId) ?? 'null')
+    },
+  }
+}
+
+test('pagehide saves the latest edit before the debounce and restores it after reload', (t) => {
+  const env = browser(t)
+  const draft = env.open()
+  draft.code.value = '// latest edit before refresh'
+  env.page.dispatchEvent(new Event('pagehide'))
+  assert.equal(env.read()?.drafts.cpp, draft.code.value)
+  assert.equal(draft.state.value, 'saved')
+  t.mock.timers.tick(400)
+  assert.equal(env.storage.writes, 1)
+  draft.scope.stop()
+  assert.equal(env.open().code.value, '// latest edit before refresh')
+})
+
+test('hiding the page flushes pending edits; remaining visible does not', async (t) => {
+  const env = browser(t)
+  const draft = env.open()
+  draft.code.value = '// edited while visible'
+  await nextTick()
+  env.document.dispatchEvent(new Event('visibilitychange'))
+  assert.equal(env.storage.writes, 0)
+  env.document.visibilityState = 'hidden'
+  env.document.dispatchEvent(new Event('visibilitychange'))
+  assert.equal(env.read()?.drafts.cpp, draft.code.value)
+  t.mock.timers.tick(400)
+  assert.equal(env.storage.writes, 1)
+})
+
+test('normal typing still debounces writes and saves the most recent edit', async (t) => {
+  const env = browser(t)
+  const draft = env.open()
+  draft.code.value = '// first edit'
+  await nextTick()
+  t.mock.timers.tick(399)
+  assert.equal(env.storage.writes, 0)
+  draft.code.value = '// second edit'
+  await nextTick()
+  t.mock.timers.tick(399)
+  assert.equal(env.storage.writes, 0)
+  t.mock.timers.tick(1)
+  assert.equal(env.read()?.drafts.cpp, '// second edit')
+  assert.equal(env.storage.writes, 1)
+})
+
+test('leaving a Vue page saves even an edit made in the same tick', (t) => {
+  const env = browser(t)
+  const draft = env.open()
+  draft.code.value = '// latest edit before navigation'
+  draft.scope.stop()
+  assert.equal(env.read()?.drafts.cpp, '// latest edit before navigation')
+  t.mock.timers.tick(400)
+  assert.equal(env.storage.writes, 1)
+})
+
+test('disposing the scope removes page lifecycle listeners', (t) => {
+  const env = browser(t)
+  const removePage = t.mock.method(env.page, 'removeEventListener')
+  const removeDocument = t.mock.method(env.document, 'removeEventListener')
+  env.open().scope.stop()
+  assert.deepEqual(
+    removePage.mock.calls.map((call) => call.arguments[0]),
+    ['pagehide'],
+  )
+  assert.deepEqual(
+    removeDocument.mock.calls.map((call) => call.arguments[0]),
+    ['visibilitychange'],
+  )
+  env.page.dispatchEvent(new Event('pagehide'))
+  env.document.visibilityState = 'hidden'
+  env.document.dispatchEvent(new Event('visibilitychange'))
+  assert.equal(env.storage.writes, 0)
+})
+
+test('pagehide preserves the selected language and keeps problem drafts separate', (t) => {
+  const env = browser(t)
+  const first = env.open('1001')
+  first.code.value = '// C++ draft'
+  first.language.value = 'python'
+  first.code.value = '# Python draft'
+  const second = env.open('1002')
+  second.code.value = '// another problem'
+  env.page.dispatchEvent(new Event('pagehide'))
+  assert.deepEqual(env.read('1001'), {
+    version: 1,
+    language: 'python',
+    drafts: { cpp: '// C++ draft', python: '# Python draft', rust: codeTemplates.rust },
+  })
+  assert.equal(env.read('1002')?.drafts.cpp, '// another problem')
+  first.scope.stop()
+  const restored = env.open('1001')
+  assert.equal(restored.language.value, 'python')
+  assert.equal(restored.code.value, '# Python draft')
+})
+
+test('a failed lifecycle save reports unavailable storage without throwing', (t) => {
+  const env = browser(t)
+  const draft = env.open()
+  env.storage.failWrites = true
+  draft.code.value = '// cannot persist yet'
+  assert.doesNotThrow(() => env.page.dispatchEvent(new Event('pagehide')))
+  assert.equal(draft.state.value, 'unavailable')
+  t.mock.timers.tick(400)
+  assert.equal(env.storage.writes, 1)
+  env.storage.failWrites = false
+  draft.code.value = '// storage recovered'
+  env.page.dispatchEvent(new Event('pagehide'))
+  assert.equal(draft.state.value, 'saved')
+  assert.equal(env.read()?.drafts.cpp, '// storage recovered')
+})
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
new file mode 100644
index 0000000..2f52f31
--- /dev/null
+++ b/frontend/tsconfig.json
@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "noEmit": true,
+    "allowImportingTsExtensions": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "types": ["vite/client", "node"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.vue", "tests/**/*.ts", "vite.config.ts"]
+}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
new file mode 100644
index 0000000..a5b61e3
--- /dev/null
+++ b/frontend/vite.config.ts
@@ -0,0 +1,26 @@
+import { defineConfig, loadEnv } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import { fileURLToPath, URL } from 'node:url'
+
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), '')
+  return {
+    plugins: [vue()],
+    build: {
+      rollupOptions: {
+        input: {
+          main: fileURLToPath(new URL('./index.html', import.meta.url)),
+          admin: fileURLToPath(new URL('./admin/index.html', import.meta.url)),
+        },
+      },
+    },
+    server: {
+      port: 5173,
+      strictPort: true,
+      proxy: {
+        '/api': { target: env.KF_API_PROXY_TARGET || 'http://127.0.0.1:8000' },
+      },
+    },
+    preview: { port: 4173, strictPort: true },
+  }
+})
diff --git a/judge/Cargo.lock b/judge/Cargo.lock
new file mode 100644
index 0000000..1699e97
--- /dev/null
+++ b/judge/Cargo.lock
@@ -0,0 +1,911 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c982642fa9e8606056828ee9a8505737230110bb1099153c79efe865c59d12ba"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anstream"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
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+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
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+
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+ "cfg-if",
+]
+
+[[package]]
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+dependencies = [
+ "libc",
+ "mio",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "windows-sys",
+]
+
+[[package]]
+name = "tokio-macros"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "proc-macro2",
+ "quote",
+ "syn 3.0.6",
+]
+
+[[package]]
+name = "tower"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project-lite",
+ "sync_wrapper",
+ "tokio",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.3"
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+
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+dependencies = [
+ "log",
+ "pin-project-lite",
+ "tracing-attributes",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-attributes"
+version = "0.1.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "once_cell",
+ "valuable",
+]
+
+[[package]]
+name = "tracing-log"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-serde"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "serde",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.3.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb7f578e5945fb242538965c2d0b04418d38ec25c79d160cd279bf0731c8d319"
+dependencies = [
+ "matchers",
+ "nu-ansi-term",
+ "once_cell",
+ "regex-automata",
+ "serde",
+ "serde_json",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
+ "tracing-serde",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.26"
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+
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+
+[[package]]
+name = "uuid"
+version = "1.27.0"
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+dependencies = [
+ "js-sys",
+ "serde_core",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "valuable"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
+
+[[package]]
+name = "wasi"
+version = "0.11.1+wasi-snapshot-preview1"
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+checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
+
+[[package]]
+name = "wasm-bindgen"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb54f33acc68fd454578d9820b0bde1a1a3d17aa17bb7b6595806d02886d409"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.129"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.129"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn 3.0.6",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.129"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "unicode-ident",
+]
+
+[[package]]
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+
+[[package]]
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+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/judge/Cargo.toml b/judge/Cargo.toml
new file mode 100644
index 0000000..72995f1
--- /dev/null
+++ b/judge/Cargo.toml
@@ -0,0 +1,35 @@
+[workspace]
+members = [
+    "crates/contracts",
+    "crates/sandbox",
+    "crates/engine",
+    "crates/worker",
+    "crates/coordinator",
+]
+resolver = "3"
+
+[workspace.package]
+version = "0.0.1"
+edition = "2024"
+rust-version = "1.99"
+license = "MIT"
+
+[workspace.dependencies]
+kf-contracts = { path = "crates/contracts" }
+kf-sandbox = { path = "crates/sandbox" }
+kf-engine = { path = "crates/engine" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+uuid = { version = "1", features = ["serde"] }
+clap = { version = "4", features = ["derive", "env"] }
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "net", "signal"] }
+axum = "0.8"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+
+[workspace.lints.rust]
+unsafe_code = "deny"
+
+[workspace.lints.clippy]
+dbg_macro = "deny"
+todo = "deny"
diff --git a/judge/README.md b/judge/README.md
new file mode 100644
index 0000000..1aec378
--- /dev/null
+++ b/judge/README.md
@@ -0,0 +1,29 @@
+# Rust 判题工程
+
+Cargo workspace 分为五个 crate：
+
+| Crate | 职责 | 当前能力 |
+| --- | --- | --- |
+| `kf-contracts` | 跨服务通知和执行契约 | 最小 v1 通知、共享 JSON 样例检查 |
+| `kf-sandbox` | Linux 隔离、限制、计量与清理 | `probe` 只读观察；`run` 拒绝执行 |
+| `kf-engine` | 语言适配、测试点编排、比较与确定性汇总 | 预留库边界，无模拟判定 |
+| `kf-worker` | 拉取、租约、工件准备与本地编排 | `--check` 入口，无消费循环 |
+| `kf-coordinator` | 节点登记、租约、状态与结果写入权 | HTTP 存活检查，无任务端点 |
+
+```bash
+# 从仓库根目录调用。
+make install
+make check-judge
+make sandbox-probe
+make worker-check
+make coordinator
+```
+
+工具链由 `rust-toolchain.toml` 固定，依赖由 `Cargo.lock` 固定。
+协调器默认只监听 `127.0.0.1:8100`，唯一接口是 `/health/live`。
+`KF_COORDINATOR_LISTEN` 可覆盖地址；在业务协议落地前不对外暴露内部服务。
+
+沙箱的 `probe` 输出只表明当前进程看到的 namespace/cgroup/seccomp 信息，
+不代表已经验证创建权限、委派或安全隔离。`run` 返回结构化拒绝和退出码 2。
+真正的权限操作和 `unsafe` 代码只能落在沙箱模块，实施时逐项记录安全理由与 Linux 验证。
+当前统一禁止 `unsafe`，需要时在对应模块明确缩小例外范围。
diff --git a/judge/crates/contracts/Cargo.toml b/judge/crates/contracts/Cargo.toml
new file mode 100644
index 0000000..07b0e0b
--- /dev/null
+++ b/judge/crates/contracts/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "kf-contracts"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+serde.workspace = true
+uuid.workspace = true
+
+[dev-dependencies]
+serde_json.workspace = true
+
+[lints]
+workspace = true
diff --git a/judge/crates/contracts/src/lib.rs b/judge/crates/contracts/src/lib.rs
new file mode 100644
index 0000000..ff4bbcb
--- /dev/null
+++ b/judge/crates/contracts/src/lib.rs
@@ -0,0 +1,43 @@
+//! Wire contracts only. No OS, networking, database or business orchestration.
+
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+pub const SCHEMA_VERSION: u16 = 1;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(try_from = "u16", into = "u16")]
+pub struct SchemaVersion;
+
+impl TryFrom<u16> for SchemaVersion {
+    type Error = &'static str;
+
+    fn try_from(value: u16) -> Result<Self, Self::Error> {
+        if value == SCHEMA_VERSION {
+            Ok(Self)
+        } else {
+            Err("unsupported contract version")
+        }
+    }
+}
+
+impl From<SchemaVersion> for u16 {
+    fn from(_: SchemaVersion) -> Self {
+        SCHEMA_VERSION
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum TaskKind {
+    #[serde(rename = "judge.evaluation")]
+    JudgeEvaluation,
+}
+
+/// Notification only; consumers must obtain execution authority from the coordinator.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct JudgeTaskNotification {
+    pub schema_version: SchemaVersion,
+    pub kind: TaskKind,
+    pub evaluation_id: Uuid,
+}
diff --git a/judge/crates/contracts/tests/wire_examples.rs b/judge/crates/contracts/tests/wire_examples.rs
new file mode 100644
index 0000000..d558b76
--- /dev/null
+++ b/judge/crates/contracts/tests/wire_examples.rs
@@ -0,0 +1,29 @@
+use kf_contracts::JudgeTaskNotification;
+use std::{fs, path::Path};
+
+#[test]
+fn shared_examples_match_python_contract() {
+    let fixtures = Path::new(env!("CARGO_MANIFEST_DIR")).join("../../../tests/fixtures/contracts");
+    let mut count = 0;
+    for entry in fs::read_dir(fixtures).expect("shared fixture directory must exist") {
+        let path = entry.expect("fixture entry").path();
+        let name = path.file_name().expect("fixture name").to_string_lossy();
+        if !name.starts_with("judge-task.") || !name.ends_with(".json") {
+            continue;
+        }
+        count += 1;
+        let text = fs::read_to_string(&path).expect("fixture is UTF-8");
+        let decoded = serde_json::from_str::<JudgeTaskNotification>(&text);
+        if name.contains(".invalid-") {
+            assert!(decoded.is_err(), "must reject {name}");
+        } else {
+            let notification = decoded.unwrap_or_else(|error| panic!("{name}: {error}"));
+            let original: serde_json::Value = serde_json::from_str(&text).expect("valid JSON");
+            assert_eq!(serde_json::to_value(notification).unwrap(), original);
+        }
+    }
+    assert!(
+        count >= 5,
+        "shared acceptance/rejection cases must not disappear"
+    );
+}
diff --git a/judge/crates/coordinator/Cargo.toml b/judge/crates/coordinator/Cargo.toml
new file mode 100644
index 0000000..66853bc
--- /dev/null
+++ b/judge/crates/coordinator/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "kf-coordinator"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+kf-contracts.workspace = true
+axum.workspace = true
+tokio.workspace = true
+clap.workspace = true
+serde.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+
+[lints]
+workspace = true
diff --git a/judge/crates/coordinator/src/api.rs b/judge/crates/coordinator/src/api.rs
new file mode 100644
index 0000000..4c0d7e7
--- /dev/null
+++ b/judge/crates/coordinator/src/api.rs
@@ -0,0 +1,21 @@
+use axum::{Json, Router, routing::get};
+use serde::Serialize;
+
+#[derive(Serialize)]
+struct HealthResponse {
+    status: &'static str,
+    service: &'static str,
+    version: &'static str,
+}
+
+async fn liveness() -> Json<HealthResponse> {
+    Json(HealthResponse {
+        status: "ok",
+        service: "coordinator",
+        version: env!("CARGO_PKG_VERSION"),
+    })
+}
+
+pub fn router() -> Router {
+    Router::new().route("/health/live", get(liveness))
+}
diff --git a/judge/crates/coordinator/src/lib.rs b/judge/crates/coordinator/src/lib.rs
new file mode 100644
index 0000000..9f05be0
--- /dev/null
+++ b/judge/crates/coordinator/src/lib.rs
@@ -0,0 +1,6 @@
+//! Internal HTTP process and future lease/state authority.
+//!
+//! Only process liveness is exposed now. SQLx repositories and task transitions
+//! are added after DR-01/PF-01 define their shared schema and concurrency rules.
+
+pub mod api;
diff --git a/judge/crates/coordinator/src/main.rs b/judge/crates/coordinator/src/main.rs
new file mode 100644
index 0000000..95d91ba
--- /dev/null
+++ b/judge/crates/coordinator/src/main.rs
@@ -0,0 +1,31 @@
+use clap::Parser;
+use std::net::SocketAddr;
+use tokio::net::TcpListener;
+use tracing_subscriber::EnvFilter;
+
+#[derive(Parser)]
+#[command(version, about = "KF judge coordinator HTTP shell")]
+struct Cli {
+    #[arg(long, env = "KF_COORDINATOR_LISTEN", default_value = "127.0.0.1:8100")]
+    listen: SocketAddr,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tracing_subscriber::fmt()
+        .json()
+        .with_env_filter(
+            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
+        )
+        .init();
+    let listener = TcpListener::bind(Cli::parse().listen).await?;
+    tracing::info!(address = %listener.local_addr()?, "coordinator scaffold listening");
+    axum::serve(listener, kf_coordinator::api::router())
+        .with_graceful_shutdown(async {
+            if let Err(error) = tokio::signal::ctrl_c().await {
+                tracing::error!(%error, "failed to listen for shutdown signal");
+            }
+        })
+        .await?;
+    Ok(())
+}
diff --git a/judge/crates/engine/Cargo.toml b/judge/crates/engine/Cargo.toml
new file mode 100644
index 0000000..c725af3
--- /dev/null
+++ b/judge/crates/engine/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "kf-engine"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+kf-contracts.workspace = true
+
+[lints]
+workspace = true
diff --git a/judge/crates/engine/src/lib.rs b/judge/crates/engine/src/lib.rs
new file mode 100644
index 0000000..6956846
--- /dev/null
+++ b/judge/crates/engine/src/lib.rs
@@ -0,0 +1,6 @@
+//! Reserved for deterministic judging orchestration (JS-05/JS-06).
+//!
+//! Owns language adaptation, case order, output comparison and verdict aggregation.
+//! Execution is supplied through a port; this crate must not access SQL, AMQP,
+//! HTTP, privilege setup or hidden host paths directly.
+//! No fake verdict or user-program execution is provided by this scaffold.
diff --git a/judge/crates/sandbox/Cargo.toml b/judge/crates/sandbox/Cargo.toml
new file mode 100644
index 0000000..c36bdf2
--- /dev/null
+++ b/judge/crates/sandbox/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "kf-sandbox"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+kf-contracts.workspace = true
+clap.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+
+[lints]
+workspace = true
diff --git a/judge/crates/sandbox/src/lib.rs b/judge/crates/sandbox/src/lib.rs
new file mode 100644
index 0000000..2181421
--- /dev/null
+++ b/judge/crates/sandbox/src/lib.rs
@@ -0,0 +1,6 @@
+//! Linux execution boundary. Current implementation only provides read-only observations.
+//!
+//! JS-01 defines execution contracts; JS-02..04 add the launcher, isolation and limits.
+//! Until that work is verified, the CLI cannot execute any user program.
+
+pub mod probe;
diff --git a/judge/crates/sandbox/src/main.rs b/judge/crates/sandbox/src/main.rs
new file mode 100644
index 0000000..05f26e8
--- /dev/null
+++ b/judge/crates/sandbox/src/main.rs
@@ -0,0 +1,38 @@
+use clap::{Parser, Subcommand};
+use std::process::ExitCode;
+
+#[derive(Parser)]
+#[command(version, about = "KF Linux sandbox entrypoint")]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    /// Observe the current Linux environment without changing it.
+    Probe,
+    /// Reserved execution entrypoint; refuses execution until isolation is implemented.
+    Run,
+}
+
+fn main() -> ExitCode {
+    match Cli::parse().command {
+        Command::Probe => match serde_json::to_string_pretty(&kf_sandbox::probe::observe()) {
+            Ok(report) => {
+                println!("{report}");
+                ExitCode::SUCCESS
+            }
+            Err(error) => {
+                eprintln!("cannot encode environment observation: {error}");
+                ExitCode::FAILURE
+            }
+        },
+        Command::Run => {
+            eprintln!(
+                "{{\"error\":\"sandbox_not_implemented\",\"message\":\"isolated execution is unavailable\"}}"
+            );
+            ExitCode::from(2)
+        }
+    }
+}
diff --git a/judge/crates/sandbox/src/probe.rs b/judge/crates/sandbox/src/probe.rs
new file mode 100644
index 0000000..45dea35
--- /dev/null
+++ b/judge/crates/sandbox/src/probe.rs
@@ -0,0 +1,49 @@
+use serde::Serialize;
+use std::fs;
+
+#[derive(Debug, Serialize)]
+pub struct EnvironmentObservation {
+    pub os: &'static str,
+    pub namespace_entries: Vec<String>,
+    pub cgroup_v2_visible: bool,
+    pub cgroup_v2_controllers: Vec<String>,
+    pub current_process_seccomp_mode: Option<u32>,
+    pub isolation_verified: bool,
+}
+
+/// Filesystem observations do not verify delegation, syscall access or safe execution.
+pub fn observe() -> EnvironmentObservation {
+    let mut namespace_entries: Vec<String> = fs::read_dir("/proc/self/ns")
+        .map(|entries| {
+            entries
+                .filter_map(Result::ok)
+                .map(|entry| entry.file_name().to_string_lossy().into_owned())
+                .collect()
+        })
+        .unwrap_or_default();
+    namespace_entries.sort();
+    let controllers = fs::read_to_string("/sys/fs/cgroup/cgroup.controllers");
+    let cgroup_v2_visible = controllers.is_ok();
+    let cgroup_v2_controllers = controllers
+        .unwrap_or_default()
+        .split_whitespace()
+        .map(str::to_owned)
+        .collect();
+    let current_process_seccomp_mode =
+        fs::read_to_string("/proc/self/status")
+            .ok()
+            .and_then(|status| {
+                status.lines().find_map(|line| {
+                    line.strip_prefix("Seccomp:")
+                        .and_then(|mode| mode.trim().parse().ok())
+                })
+            });
+    EnvironmentObservation {
+        os: std::env::consts::OS,
+        namespace_entries,
+        cgroup_v2_visible,
+        cgroup_v2_controllers,
+        current_process_seccomp_mode,
+        isolation_verified: false,
+    }
+}
diff --git a/judge/crates/sandbox/tests/refuse_execution.rs b/judge/crates/sandbox/tests/refuse_execution.rs
new file mode 100644
index 0000000..7a0e980
--- /dev/null
+++ b/judge/crates/sandbox/tests/refuse_execution.rs
@@ -0,0 +1,14 @@
+use std::process::Command;
+
+#[test]
+fn execution_entrypoint_fails_closed() {
+    let output = Command::new(env!("CARGO_BIN_EXE_kf-sandbox"))
+        .arg("run")
+        .output()
+        .expect("sandbox binary must start");
+    assert_eq!(output.status.code(), Some(2));
+    assert!(output.stdout.is_empty());
+    let error: serde_json::Value =
+        serde_json::from_slice(&output.stderr).expect("structured refusal");
+    assert_eq!(error["error"], "sandbox_not_implemented");
+}
diff --git a/judge/crates/worker/Cargo.toml b/judge/crates/worker/Cargo.toml
new file mode 100644
index 0000000..71152e8
--- /dev/null
+++ b/judge/crates/worker/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "kf-worker"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+kf-contracts.workspace = true
+kf-engine.workspace = true
+kf-sandbox.workspace = true
+clap.workspace = true
+serde_json.workspace = true
+
+[lints]
+workspace = true
diff --git a/judge/crates/worker/src/main.rs b/judge/crates/worker/src/main.rs
new file mode 100644
index 0000000..893ae94
--- /dev/null
+++ b/judge/crates/worker/src/main.rs
@@ -0,0 +1,28 @@
+use clap::Parser;
+use std::process::ExitCode;
+
+#[derive(Parser)]
+#[command(version, about = "KF judge worker entrypoint")]
+struct Cli {
+    /// Check the process entrypoint without consuming or executing tasks.
+    #[arg(long)]
+    check: bool,
+}
+
+fn main() -> ExitCode {
+    if !Cli::parse().check {
+        eprintln!("judge worker task loop is not implemented; use --check");
+        return ExitCode::from(2);
+    }
+    println!(
+        "{}",
+        serde_json::json!({
+            "service": "judge-worker",
+            "version": env!("CARGO_PKG_VERSION"),
+            "status": "scaffold",
+            "contract_version": kf_contracts::SCHEMA_VERSION,
+            "consuming_tasks": false
+        })
+    );
+    ExitCode::SUCCESS
+}
diff --git a/judge/rust-toolchain.toml b/judge/rust-toolchain.toml
new file mode 100644
index 0000000..b432996
--- /dev/null
+++ b/judge/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "1.99.0"
+profile = "minimal"
+components = ["rustfmt", "clippy"]
diff --git a/scripts/check_architecture.py b/scripts/check_architecture.py
new file mode 100644
index 0000000..b6dac3e
--- /dev/null
+++ b/scripts/check_architecture.py
@@ -0,0 +1,109 @@
+"""Enforce Python import direction and the Rust internal crate dependency graph."""
+
+import ast
+import sys
+import tomllib
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+PACKAGE = ROOT / "backend/src/kf_oj"
+RUST_ALLOWED = {
+    "kf-contracts": set(),
+    "kf-sandbox": {"kf-contracts"},
+    "kf-engine": {"kf-contracts"},
+    "kf-coordinator": {"kf-contracts"},
+    "kf-worker": {"kf-contracts", "kf-engine", "kf-sandbox"},
+}
+PYTHON_ALLOWED = {
+    "contracts": {"contracts"},
+    "core": {"core", "contracts"},
+    "infra": {"infra", "core", "contracts"},
+    "runtime": {"runtime", "core", "contracts"},
+    "modules": {"modules", "runtime", "infra", "core", "contracts"},
+    "api": {"api", "modules", "runtime", "infra", "core", "contracts"},
+    "workers": {"workers", "modules", "runtime", "infra", "core", "contracts"},
+}
+
+
+def imports(tree: ast.AST, package: str):
+    for node in ast.walk(tree):
+        if isinstance(node, ast.Import):
+            for alias in node.names:
+                yield alias.name
+        elif isinstance(node, ast.ImportFrom):
+            if node.level:
+                parts = package.split(".")
+                base = ".".join(parts[: len(parts) - node.level + 1])
+                target = ".".join(filter(None, [base, node.module]))
+            else:
+                target = node.module or ""
+            for alias in node.names:
+                yield target if alias.name == "*" else f"{target}.{alias.name}"
+
+
+def python_violations() -> list[str]:
+    violations = []
+    for path in sorted(PACKAGE.rglob("*.py")):
+        relative = path.relative_to(PACKAGE)
+        if len(relative.parts) < 2:
+            continue
+        # Offline build tooling composes the API to export its schema, not a runtime dependency.
+        if relative.as_posix() == "contracts/export.py":
+            continue
+        layer = relative.parts[0]
+        package = "kf_oj." + ".".join(relative.parts[:-1])
+        for target in imports(ast.parse(path.read_text(encoding="utf-8")), package):
+            parts = target.split(".")
+            if len(parts) < 2 or parts[0] != "kf_oj" or parts[1] == "__version__":
+                continue
+            if parts[1] not in PYTHON_ALLOWED.get(layer, set()):
+                violations.append(f"{path.relative_to(ROOT)}: {layer} cannot import {target}")
+            elif layer == "modules" and parts[1] == "modules" and len(parts) >= 3:
+                own_module = relative.parts[1]
+                if parts[2] != own_module and (len(parts) < 4 or parts[3] != "public"):
+                    violations.append(
+                        f"{path.relative_to(ROOT)}: cross-module import must use public.py: "
+                        f"{target}"
+                    )
+    return violations
+
+
+def rust_violations() -> list[str]:
+    violations = []
+    manifests = list((ROOT / "judge/crates").glob("*/Cargo.toml"))
+    found = set()
+    for path in manifests:
+        manifest = tomllib.loads(path.read_text(encoding="utf-8"))
+        name = manifest["package"]["name"]
+        found.add(name)
+        if name not in RUST_ALLOWED:
+            violations.append(f"{path.relative_to(ROOT)}: declare the new crate boundary first")
+            continue
+        groups = [manifest]
+        groups.extend(manifest.get("target", {}).values())
+        for group in groups:
+            for section in ("dependencies", "dev-dependencies", "build-dependencies"):
+                for key, dependency in group.get(section, {}).items():
+                    actual = dependency.get("package", key) if isinstance(dependency, dict) else key
+                    if actual.startswith("kf-") and actual not in RUST_ALLOWED[name]:
+                        violations.append(f"{name} cannot depend on {actual}")
+        if name in {"kf-contracts", "kf-engine"}:
+            allowed_external = {"serde", "serde_json", "uuid"}
+            for key in manifest.get("dependencies", {}):
+                if not key.startswith("kf-") and key not in allowed_external:
+                    violations.append(f"{name}: domain/contract crate cannot depend on {key}")
+    if found != set(RUST_ALLOWED):
+        violations.append("Rust workspace crates differ from the declared architecture")
+    return violations
+
+
+def main() -> None:
+    violations = python_violations() + rust_violations()
+    if violations:
+        print("\n".join(violations), file=sys.stderr)
+        raise SystemExit(1)
+    print("Architecture boundaries: OK (Python imports + Rust crate graph)")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/skills/README.md b/skills/README.md
new file mode 100644
index 0000000..79646a0
--- /dev/null
+++ b/skills/README.md
@@ -0,0 +1,7 @@
+# 平台内置技能
+
+此目录预留给 KF-OnlineJudge 自有的声明式内置技能：提交复盘、渐进式答疑、专项训练和阶段复习。
+这里的内容属于产品数据，不是指示开发工具运行的 Codex Skills。
+
+包格式和许可规则在 SP-01 中固定后再添加实际技能。
+个人绑定、配置、发布记录和私有学习证据由后端对应业务模块管理；不存放在共享包中。
diff --git a/tests/README.md b/tests/README.md
new file mode 100644
index 0000000..28ee8ff
--- /dev/null
+++ b/tests/README.md
@@ -0,0 +1,7 @@
+# 跨工程测试材料
+
+`fixtures/contracts/` 保存 Python/Rust 共用的合法与非法协议样例。
+各工程自身的测试仍放在 `backend/tests/` 与 Rust crate 的 `tests/` 中。
+
+后续在这里增加构造题目、正常/异常程序及端到端夹具，不提交真实私有代码或隐藏题库。
+沙箱破坏性测试在明确的专用执行环境中进行，不由普通构建检查自动运行。
diff --git a/tests/fixtures/contracts/judge-task.invalid-extra.json b/tests/fixtures/contracts/judge-task.invalid-extra.json
new file mode 100644
index 0000000..ba47cf6
--- /dev/null
+++ b/tests/fixtures/contracts/judge-task.invalid-extra.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2",
+  "source_code": "not allowed in notification"
+}
diff --git a/tests/fixtures/contracts/judge-task.invalid-id.json b/tests/fixtures/contracts/judge-task.invalid-id.json
new file mode 100644
index 0000000..9415eda
--- /dev/null
+++ b/tests/fixtures/contracts/judge-task.invalid-id.json
@@ -0,0 +1,5 @@
+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "not-a-uuid"
+}
diff --git a/tests/fixtures/contracts/judge-task.invalid-kind.json b/tests/fixtures/contracts/judge-task.invalid-kind.json
new file mode 100644
index 0000000..98df0fe
--- /dev/null
+++ b/tests/fixtures/contracts/judge-task.invalid-kind.json
@@ -0,0 +1,5 @@
+{
+  "schema_version": 1,
+  "kind": "learning.run",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}
diff --git a/tests/fixtures/contracts/judge-task.invalid-version.json b/tests/fixtures/contracts/judge-task.invalid-version.json
new file mode 100644
index 0000000..750a63c
--- /dev/null
+++ b/tests/fixtures/contracts/judge-task.invalid-version.json
@@ -0,0 +1,5 @@
+{
+  "schema_version": 2,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}
diff --git a/tests/fixtures/contracts/judge-task.valid.json b/tests/fixtures/contracts/judge-task.valid.json
new file mode 100644
index 0000000..0a8cc84
--- /dev/null
+++ b/tests/fixtures/contracts/judge-task.valid.json
@@ -0,0 +1,5 @@
+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}