feat(frontend): add practice page previews and code workbench

Add problem filtering, trainings, contests, submission details and rankings.
Provide a split problem/editor layout with multilingual local drafts and self-test panels.
Run and submit actions show pending service integration.

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>

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>

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>

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>

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>

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>

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>

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>

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>