diff --git a/src/App.vue b/src/App.vue
index 41e9f92..a2eec74 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,102 +1,24 @@
 <template>
-  <!-- 分离窗口：纯内容，不渲染主布局 -->
-  <div v-if="isDetached" class="df-detached-root">
+  <AppLayout :is-detached="isDetached">
+    <!-- 主窗口:页面内容(router-view + 页面切换过渡) -->
     <router-view v-slot="{ Component }">
-      <component :is="Component" />
+      <transition name="page" mode="out-in">
+        <component :is="Component" />
+      </transition>
     </router-view>
-  </div>
-  <!-- 主窗口：完整布局 -->
-  <div v-else class="df-shell">
-    <!-- ═══ Sidebar ═══ -->
-    <aside class="df-sidebar">
-      <!-- Logo -->
-      <div class="sidebar-brand">
-        <div class="brand-mark">
-          <svg width="20" height="20" viewBox="0 0 24 24" fill="none">
-            <path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z" fill="url(#brand-grad)" />
-            <defs><linearGradient id="brand-grad" x1="3" y1="2" x2="21" y2="22">
-              <stop stop-color="#7b6ff0"/><stop offset="1" stop-color="#5eaff0"/>
-            </linearGradient></defs>
-          </svg>
-        </div>
-        <span class="brand-text">DevFlow</span>
-        <span class="brand-version">v0.1</span>
-      </div>
 
-      <!-- Navigation -->
-      <nav class="sidebar-nav">
-        <div class="nav-group">
-          <span class="nav-group-label">{{ $t('nav.workspace') }}</span>
-          <router-link
-            v-for="item in primaryNav" :key="item.path"
-            :to="item.path"
-            class="nav-link"
-            active-class="nav-link--active"
-          >
-            <span class="nav-link-icon" v-html="item.svg"></span>
-            <span class="nav-link-text">{{ $t(item.label) }}</span>
-            <span v-if="item.badge" class="nav-link-badge">{{ item.badge }}</span>
-          </router-link>
-        </div>
-
-        <div class="nav-divider"></div>
-
-        <div class="nav-group">
-          <span class="nav-group-label">{{ $t('nav.traceability') }}</span>
-          <router-link
-            v-for="item in secondaryNav" :key="item.path"
-            :to="item.path"
-            class="nav-link"
-            active-class="nav-link--active"
-          >
-            <span class="nav-link-icon" v-html="item.svg"></span>
-            <span class="nav-link-text">{{ $t(item.label) }}</span>
-            <span v-if="item.path === '/knowledge' && candidateCount > 0" class="nav-link-badge">{{ candidateCount }}</span>
-          </router-link>
-        </div>
-      </nav>
-
-      <!-- Footer -->
-      <div class="sidebar-footer">
-        <div class="sidebar-status">
-          <span class="status-dot"></span>
-          <span class="status-text">{{ $t('nav.systemReady') }}</span>
-        </div>
-        <!-- AI 面板切换按钮 -->
-        <button class="nav-link ai-toggle-btn" :class="{ 'ai-toggle-btn--active': aiStore.state.panelOpen }" @click="aiStore.togglePanel()">
-          <span class="nav-link-icon">
-            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M12 2a7 7 0 014 12.74V17a1 1 0 01-1 1H9a1 1 0 01-1-1v-2.26A7 7 0 0112 2z"/><line x1="9" y1="21" x2="15" y2="21"/></svg>
-          </span>
-          <span class="nav-link-text">{{ $t('nav.aiPanel') }}</span>
-          <span class="ai-toggle-shortcut">⌘I</span>
-        </button>
-        <router-link to="/settings" class="nav-link" active-class="nav-link--active">
-          <span class="nav-link-icon">
-            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 00.33 1.82l.06.06a2 2 0 010 2.83 2 2 0 01-2.83 0l-.06-.06a1.65 1.65 0 00-1.82-.33 1.65 1.65 0 00-1 1.51V21a2 2 0 01-4 0v-.09A1.65 1.65 0 009 19.4a1.65 1.65 0 00-1.82.33l-.06.06a2 2 0 01-2.83-2.83l.06-.06A1.65 1.65 0 004.68 15a1.65 1.65 0 00-1.51-1H3a2 2 0 010-4h.09A1.65 1.65 0 004.6 9a1.65 1.65 0 00-.33-1.82l-.06-.06a2 2 0 012.83-2.83l.06.06A1.65 1.65 0 009 4.68a1.65 1.65 0 001-1.51V3a2 2 0 014 0v.09a1.65 1.65 0 001 1.51 1.65 1.65 0 001.82-.33l.06-.06a2 2 0 012.83 2.83l-.06.06A1.65 1.65 0 0019.4 9a1.65 1.65 0 001.51 1H21a2 2 0 010 4h-.09a1.65 1.65 0 00-1.51 1z"/></svg>
-          </span>
-          <span class="nav-link-text">{{ $t('nav.settings') }}</span>
-        </router-link>
-      </div>
-    </aside>
-
-    <!-- ═══ Main (页面内容) ═══ -->
-    <!-- 仅在 AI 面板可见且最大化时隐藏主内容；面板关闭时无论 maximized 状态如何都显示 -->
-    <main class="df-main" v-show="!(aiStore.state.maximized && aiStore.state.panelOpen)">
+    <!-- 分离窗口:纯内容 -->
+    <template #detached>
       <router-view v-slot="{ Component }">
-        <transition name="page" mode="out-in">
-          <component :is="Component" />
-        </transition>
+        <component :is="Component" />
       </router-view>
-    </main>
+    </template>
 
-    <!-- ═══ AI Chat Panel ═══ -->
-    <transition name="ai-slide">
-      <div v-if="aiStore.state.panelOpen && !aiStore.state.detached" class="df-ai-panel" :style="panelStyle">
-        <div v-show="!aiStore.state.maximized" class="ai-resize-handle" :class="{ active: resizing }" @mousedown="startResize"></div>
-        <AiChat />
-      </div>
-    </transition>
-  </div>
+    <!-- AI Chat Panel 内容 -->
+    <template #ai-panel>
+      <AiChat />
+    </template>
+  </AppLayout>
 
   <!-- 全局错误 toast(根级,主窗口与分离窗口共用)-->
   <transition name="toast">
@@ -113,6 +35,7 @@ import { useProjectStore } from './stores/project'
 import { useAppSettingsStore } from './stores/appSettings'
 import i18n from './i18n'
 import AiChat from './components/AiChat.vue'
+import AppLayout from './components/layout/AppLayout.vue'
 import { aiApi } from '@/api'
 
 const route = useRoute()
@@ -139,49 +62,6 @@ watch(() => route.path, (path) => {
   }
 })
 
-// ── AI 面板拖拽调宽 ──
-// useSetting 监听 appSettings 缓存:loadAll 异步填充后会自动刷新 ref
-const panelWidth = appSettings.useSetting<number>('df-ai-width', 500)
-const resizing = ref(false)
-
-// maximized=全宽(flex:1填充) | sidebar=固定宽
-const panelStyle = computed(() => {
-  if (aiStore.state.maximized) return { flex: '1', minWidth: '0' }
-  return {
-    width: panelWidth.value + 'px',
-    minWidth: panelWidth.value + 'px',
-    maxWidth: panelWidth.value + 'px',
-  }
-})
-
-function startResize(e: MouseEvent) {
-  e.preventDefault()
-  resizing.value = true
-  const startX = e.clientX
-  const startWidth = panelWidth.value
-
-  document.body.style.cursor = 'col-resize'
-  document.body.style.userSelect = 'none'
-
-  function onMouseMove(ev: MouseEvent) {
-    const delta = startX - ev.clientX // 向左拖 = 增宽
-    const newWidth = Math.max(320, Math.min(800, startWidth + delta))
-    panelWidth.value = newWidth
-  }
-
-  function onMouseUp() {
-    resizing.value = false
-    document.body.style.cursor = ''
-    document.body.style.userSelect = ''
-    void appSettings.set('df-ai-width', panelWidth.value)
-    document.removeEventListener('mousemove', onMouseMove)
-    document.removeEventListener('mouseup', onMouseUp)
-  }
-
-  document.addEventListener('mousemove', onMouseMove)
-  document.addEventListener('mouseup', onMouseUp)
-}
-
 // 主题初始化
 function initTheme() {
   const saved = appSettings.get<string>('df-theme', 'dark')
@@ -270,263 +150,16 @@ async function migrateLegacyLocalStorage(): Promise<void> {
   }
 }
 
-// 知识库候选数量(侧栏 badge)— 解包 computed 取值保持响应式
+// 知识库 store(侧栏 badge 计数在 AppSidebar 内消费,此处仅确保 store 实例化供 onMounted loadCandidates)
 const knowledgeStore = useKnowledgeStore()
-const candidateCount = computed(() => knowledgeStore.candidateCount)
 
 onUnmounted(() => {
   window.removeEventListener('keydown', handleKeydown)
   projectStore.stopDataChangedListener?.()
 })
-
-const primaryNav = [
-  { path: '/dashboard', label: 'nav.overview', badge: null,
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="7" height="7" rx="1"/><rect x="14" y="3" width="7" height="7" rx="1"/><rect x="3" y="14" width="7" height="7" rx="1"/><rect x="14" y="14" width="7" height="7" rx="1"/></svg>' },
-  { path: '/ideas', label: 'nav.ideas', badge: null,
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M9 18h6M10 22h4M12 2a7 7 0 014 12.74V17a1 1 0 01-1 1h-6a1 1 0 01-1-1v-2.26A7 7 0 0112 2z"/></svg>' },
-  { path: '/projects', label: 'nav.projects', badge: null,
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M22 19a2 2 0 01-2 2H4a2 2 0 01-2-2V5a2 2 0 012-2h5l2 3h9a2 2 0 012 2z"/></svg>' },
-  { path: '/tasks', label: 'nav.tasks', badge: null,
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>' },
-]
-
-const secondaryNav = [
-  { path: '/knowledge', label: 'nav.knowledge',
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 016.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 014 19.5v-15A2.5 2.5 0 016.5 2z"/></svg>' },
-  { path: '/audit', label: 'nav.audit',
-    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M9 11l3 3L22 4"/><path d="M21 12v7a2 2 0 01-2 2H5a2 2 0 01-2-2V5a2 2 0 012-2h11"/></svg>' },
-]
 </script>
 
 <style scoped>
-.df-detached-root { width: 100vw; height: 100vh; overflow: hidden; background: var(--df-bg); }
-.df-shell { display: flex; height: 100vh; width: 100vw; overflow: hidden; }
-
-/* ═══ Sidebar ═══ */
-.df-sidebar {
-  width: 192px;
-  min-width: 192px;
-  background: var(--df-sidebar-bg);
-  border-right: 0.5px solid var(--df-border);
-  display: flex;
-  flex-direction: column;
-  position: relative;
-  user-select: none;
-}
-
-/* — Logo — */
-.sidebar-brand {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  padding: 14px 16px 12px;
-  border-bottom: 0.5px solid var(--df-border);
-}
-.brand-mark {
-  width: 28px; height: 28px;
-  display: flex; align-items: center; justify-content: center;
-  background: var(--df-accent-bg);
-  border: 0.5px solid var(--df-border);
-}
-.brand-text {
-  font-size: 15px;
-  font-weight: 500;
-  letter-spacing: -0.3px;
-  color: var(--df-text);
-}
-.brand-version {
-  font-family: var(--df-font-mono);
-  font-size: 10px;
-  color: var(--df-text-dim);
-  background: rgba(255,255,255,0.04);
-  padding: 1px 6px;
-  border-radius: var(--df-radius-xs);
-  margin-left: auto;
-}
-
-/* — Nav — */
-.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 8px; }
-
-.nav-group { margin-bottom: 2px; }
-.nav-group-label {
-  display: block;
-  padding: 8px 10px 4px;
-  font-size: 9px;
-  font-weight: 500;
-  text-transform: uppercase;
-  letter-spacing: 1.2px;
-  color: var(--df-text-dim);
-}
-
-.nav-divider {
-  height: 0.5px;
-  background: var(--df-border);
-  margin: 6px 12px;
-}
-
-.nav-link {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  padding: 5px 10px;
-  margin: 1px 0;
-  border-radius: var(--df-radius-sm);
-  color: var(--df-text-secondary);
-  text-decoration: none;
-  font-size: 12px;
-  font-weight: 450;
-  transition: all 0.18s var(--df-ease);
-  position: relative;
-}
-
-.nav-link:hover {
-  background: var(--df-sidebar-hover);
-  color: var(--df-text);
-}
-.nav-link--active {
-  background: var(--df-sidebar-active);
-  color: var(--df-accent);
-  font-weight: 500;
-}
-.nav-link--active::before {
-  content: '';
-  position: absolute;
-  left: -10px;
-  top: 50%;
-  transform: translateY(-50%);
-  width: 3px;
-  height: 16px;
-  background: var(--df-accent);
-  border-radius: 0 3px 3px 0;
-}
-
-.nav-link-icon {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 18px;
-  height: 18px;
-  opacity: 0.7;
-  flex-shrink: 0;
-}
-.nav-link--active .nav-link-icon { opacity: 1; }
-
-.nav-link-text { flex: 1; }
-
-.nav-link-badge {
-  font-family: var(--df-font-mono);
-  font-size: 10px;
-  font-weight: 500;
-  padding: 1px 6px;
-  border-radius: var(--df-radius);
-  min-width: 18px;
-  text-align: center;
-  background: var(--df-accent);
-  color: #fff;
-  line-height: 1.4;
-}
-
-/* — AI Toggle Button — */
-.ai-toggle-btn {
-  cursor: pointer;
-  border: none;
-  background: transparent;
-  width: 100%;
-  font: inherit;
-  text-align: left;
-  appearance: none;
-  -webkit-appearance: none;
-}
-.ai-toggle-btn--active {
-  color: var(--df-accent);
-  background: var(--df-sidebar-active);
-}
-.ai-toggle-shortcut {
-  font-family: var(--df-font-mono);
-  font-size: 9px;
-  color: var(--df-text-dim);
-  background: rgba(255,255,255,0.04);
-  padding: 1px 5px;
-  border-radius: var(--df-radius-sm);
-}
-
-/* — Footer — */
-.sidebar-footer {
-  padding: 6px 8px;
-  border-top: 0.5px solid var(--df-border);
-}
-
-.sidebar-status {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-  padding: 4px 10px;
-  margin-bottom: 1px;
-}
-.status-dot {
-  width: 6px; height: 6px;
-  border-radius: 50%;
-  background: var(--df-success);
-  animation: pulseGlow 3s ease-in-out infinite;
-}
-.status-text {
-  font-family: var(--df-font-mono);
-  font-size: 10px;
-  color: var(--df-text-dim);
-  letter-spacing: 0.3px;
-}
-
-/* — Main — */
-.df-main {
-  flex: 1;
-  overflow-y: auto;
-  overflow-x: hidden;
-  background: var(--df-bg);
-  min-width: 0;
-}
-
-/* — AI Panel (全宽) — */
-.df-ai-panel {
-  position: relative;
-  height: 100vh;
-  overflow: hidden;
-}
-
-/* — AI Resize Handle — */
-.ai-resize-handle {
-  position: absolute;
-  left: 0; top: 0; bottom: 0;
-  width: 4px;
-  cursor: col-resize;
-  z-index: 10;
-  transition: background 0.15s;
-}
-.ai-resize-handle:hover,
-.ai-resize-handle.active {
-  background: var(--df-accent);
-  opacity: 0.4;
-}
-
-/* — AI Slide Transition — */
-.ai-slide-enter-active { transition: opacity 0.2s var(--df-ease); }
-.ai-slide-leave-active { transition: opacity 0.15s var(--df-ease); }
-.ai-slide-enter-from, .ai-slide-leave-to {
-  opacity: 0;
-}
-
-/* ═══ Responsive ═══ */
-@media (max-width: 768px) {
-  .df-sidebar { width: 56px; min-width: 56px; }
-  .brand-text, .brand-version, .nav-group-label, .nav-link-text,
-  .nav-link-badge, .sidebar-status, .status-text, .ai-toggle-shortcut { display: none; }
-  .sidebar-brand { padding: 12px 10px 10px; justify-content: center; }
-  .brand-mark { width: 32px; height: 32px; }
-  .nav-link { justify-content: center; padding: 8px 0; }
-  .nav-divider { margin: 4px 8px; }
-  .nav-link--active::before { display: none; }
-  .df-ai-panel { width: 100vw; min-width: 100vw; max-width: 100vw; position: absolute; right: 0; top: 0; z-index: 100; }
-}
-
 /* — Page Transition — */
 .page-enter-active { transition: opacity 0.2s var(--df-ease), transform 0.2s var(--df-ease); }
 .page-leave-active { transition: opacity 0.12s var(--df-ease), transform 0.12s var(--df-ease); }
diff --git a/src/components/layout/AppLayout.vue b/src/components/layout/AppLayout.vue
new file mode 100644
index 0000000..f3ec572
--- /dev/null
+++ b/src/components/layout/AppLayout.vue
@@ -0,0 +1,129 @@
+<template>
+  <!-- 分离窗口:纯内容,不渲染主布局 -->
+  <div v-if="isDetached" class="df-detached-root">
+    <slot name="detached" />
+  </div>
+  <!-- 主窗口:完整布局 -->
+  <div v-else class="df-shell">
+    <AppSidebar />
+
+    <!-- ═══ Main (页面内容) ═══ -->
+    <!-- 仅在 AI 面板可见且最大化时隐藏主内容;面板关闭时无论 maximized 状态如何都显示 -->
+    <main class="df-main" v-show="!(aiStore.state.maximized && aiStore.state.panelOpen)">
+      <slot />
+    </main>
+
+    <!-- ═══ AI Chat Panel ═══ -->
+    <transition name="ai-slide">
+      <div v-if="aiStore.state.panelOpen && !aiStore.state.detached" class="df-ai-panel" :style="panelStyle">
+        <div v-show="!aiStore.state.maximized" class="ai-resize-handle" :class="{ active: resizing }" @mousedown="startResize"></div>
+        <slot name="ai-panel" />
+      </div>
+    </transition>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+import { useAiStore } from '@/stores/ai'
+import { useAppSettingsStore } from '@/stores/appSettings'
+import AppSidebar from './AppSidebar.vue'
+
+defineProps<{
+  isDetached: boolean
+}>()
+
+const aiStore = useAiStore()
+const appSettings = useAppSettingsStore()
+
+// ── AI 面板拖拽调宽 ──
+// useSetting 监听 appSettings 缓存:loadAll 异步填充后会自动刷新 ref
+const panelWidth = appSettings.useSetting<number>('df-ai-width', 500)
+const resizing = ref(false)
+
+// maximized=全宽(flex:1填充) | sidebar=固定宽
+const panelStyle = computed(() => {
+  if (aiStore.state.maximized) return { flex: '1', minWidth: '0' }
+  return {
+    width: panelWidth.value + 'px',
+    minWidth: panelWidth.value + 'px',
+    maxWidth: panelWidth.value + 'px',
+  }
+})
+
+function startResize(e: MouseEvent) {
+  e.preventDefault()
+  resizing.value = true
+  const startX = e.clientX
+  const startWidth = panelWidth.value
+
+  document.body.style.cursor = 'col-resize'
+  document.body.style.userSelect = 'none'
+
+  function onMouseMove(ev: MouseEvent) {
+    const delta = startX - ev.clientX // 向左拖 = 增宽
+    const newWidth = Math.max(320, Math.min(800, startWidth + delta))
+    panelWidth.value = newWidth
+  }
+
+  function onMouseUp() {
+    resizing.value = false
+    document.body.style.cursor = ''
+    document.body.style.userSelect = ''
+    void appSettings.set('df-ai-width', panelWidth.value)
+    document.removeEventListener('mousemove', onMouseMove)
+    document.removeEventListener('mouseup', onMouseUp)
+  }
+
+  document.addEventListener('mousemove', onMouseMove)
+  document.addEventListener('mouseup', onMouseUp)
+}
+</script>
+
+<style scoped>
+.df-detached-root { width: 100vw; height: 100vh; overflow: hidden; background: var(--df-bg); }
+.df-shell { display: flex; height: 100vh; width: 100vw; overflow: hidden; }
+
+/* — Main — */
+.df-main {
+  flex: 1;
+  overflow-y: auto;
+  overflow-x: hidden;
+  background: var(--df-bg);
+  min-width: 0;
+}
+
+/* — AI Panel (全宽) — */
+.df-ai-panel {
+  position: relative;
+  height: 100vh;
+  overflow: hidden;
+}
+
+/* — AI Resize Handle — */
+.ai-resize-handle {
+  position: absolute;
+  left: 0; top: 0; bottom: 0;
+  width: 4px;
+  cursor: col-resize;
+  z-index: 10;
+  transition: background 0.15s;
+}
+.ai-resize-handle:hover,
+.ai-resize-handle.active {
+  background: var(--df-accent);
+  opacity: 0.4;
+}
+
+/* — AI Slide Transition — */
+.ai-slide-enter-active { transition: opacity 0.2s var(--df-ease); }
+.ai-slide-leave-active { transition: opacity 0.15s var(--df-ease); }
+.ai-slide-enter-from, .ai-slide-leave-to {
+  opacity: 0;
+}
+
+/* ═══ Responsive ═══ */
+@media (max-width: 768px) {
+  .df-ai-panel { width: 100vw; min-width: 100vw; max-width: 100vw; position: absolute; right: 0; top: 0; z-index: 100; }
+}
+</style>
diff --git a/src/components/layout/AppSidebar.vue b/src/components/layout/AppSidebar.vue
new file mode 100644
index 0000000..982b3b2
--- /dev/null
+++ b/src/components/layout/AppSidebar.vue
@@ -0,0 +1,289 @@
+<template>
+  <aside class="df-sidebar">
+    <!-- Logo -->
+    <div class="sidebar-brand">
+      <div class="brand-mark">
+        <svg width="20" height="20" viewBox="0 0 24 24" fill="none">
+          <path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z" fill="url(#brand-grad)" />
+          <defs><linearGradient id="brand-grad" x1="3" y1="2" x2="21" y2="22">
+            <stop stop-color="#7b6ff0"/><stop offset="1" stop-color="#5eaff0"/>
+          </linearGradient></defs>
+        </svg>
+      </div>
+      <span class="brand-text">DevFlow</span>
+      <span class="brand-version">v0.1</span>
+    </div>
+
+    <!-- Navigation -->
+    <nav class="sidebar-nav">
+      <div class="nav-group">
+        <span class="nav-group-label">{{ $t('nav.workspace') }}</span>
+        <router-link
+          v-for="item in primaryNav" :key="item.path"
+          :to="item.path"
+          class="nav-link"
+          active-class="nav-link--active"
+        >
+          <span class="nav-link-icon" v-html="item.svg"></span>
+          <span class="nav-link-text">{{ $t(item.label) }}</span>
+          <span v-if="item.badge" class="nav-link-badge">{{ item.badge }}</span>
+        </router-link>
+      </div>
+
+      <div class="nav-divider"></div>
+
+      <div class="nav-group">
+        <span class="nav-group-label">{{ $t('nav.traceability') }}</span>
+        <router-link
+          v-for="item in secondaryNav" :key="item.path"
+          :to="item.path"
+          class="nav-link"
+          active-class="nav-link--active"
+        >
+          <span class="nav-link-icon" v-html="item.svg"></span>
+          <span class="nav-link-text">{{ $t(item.label) }}</span>
+          <span v-if="item.path === '/knowledge' && candidateCount > 0" class="nav-link-badge">{{ candidateCount }}</span>
+        </router-link>
+      </div>
+    </nav>
+
+    <!-- Footer -->
+    <div class="sidebar-footer">
+      <div class="sidebar-status">
+        <span class="status-dot"></span>
+        <span class="status-text">{{ $t('nav.systemReady') }}</span>
+      </div>
+      <!-- AI 面板切换按钮 -->
+      <button class="nav-link ai-toggle-btn" :class="{ 'ai-toggle-btn--active': aiStore.state.panelOpen }" @click="aiStore.togglePanel()">
+        <span class="nav-link-icon">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M12 2a7 7 0 014 12.74V17a1 1 0 01-1 1H9a1 1 0 01-1-1v-2.26A7 7 0 0112 2z"/><line x1="9" y1="21" x2="15" y2="21"/></svg>
+        </span>
+        <span class="nav-link-text">{{ $t('nav.aiPanel') }}</span>
+        <span class="ai-toggle-shortcut">⌘I</span>
+      </button>
+      <router-link to="/settings" class="nav-link" active-class="nav-link--active">
+        <span class="nav-link-icon">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 00.33 1.82l.06.06a2 2 0 010 2.83 2 2 0 01-2.83 0l-.06-.06a1.65 1.65 0 00-1.82-.33 1.65 1.65 0 00-1 1.51V21a2 2 0 01-4 0v-.09A1.65 1.65 0 009 19.4a1.65 1.65 0 00-1.82.33l-.06.06a2 2 0 01-2.83-2.83l.06-.06A1.65 1.65 0 004.68 15a1.65 1.65 0 00-1.51-1H3a2 2 0 010-4h.09A1.65 1.65 0 004.6 9a1.65 1.65 0 00-.33-1.82l-.06-.06a2 2 0 012.83-2.83l.06.06A1.65 1.65 0 009 4.68a1.65 1.65 0 001-1.51V3a2 2 0 014 0v.09a1.65 1.65 0 001 1.51 1.65 1.65 0 001.82-.33l.06-.06a2 2 0 012.83 2.83l-.06.06A1.65 1.65 0 0019.4 9a1.65 1.65 0 001.51 1H21a2 2 0 010 4h-.09a1.65 1.65 0 00-1.51 1z"/></svg>
+        </span>
+        <span class="nav-link-text">{{ $t('nav.settings') }}</span>
+      </router-link>
+    </div>
+  </aside>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useAiStore } from '@/stores/ai'
+import { useKnowledgeStore } from '@/stores/knowledge'
+
+const aiStore = useAiStore()
+const knowledgeStore = useKnowledgeStore()
+
+// 知识库候选数量(侧栏 badge)— 解包 computed 取值保持响应式
+const candidateCount = computed(() => knowledgeStore.candidateCount)
+
+const primaryNav = [
+  { path: '/dashboard', label: 'nav.overview', badge: null,
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="7" height="7" rx="1"/><rect x="14" y="3" width="7" height="7" rx="1"/><rect x="3" y="14" width="7" height="7" rx="1"/><rect x="14" y="14" width="7" height="7" rx="1"/></svg>' },
+  { path: '/ideas', label: 'nav.ideas', badge: null,
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M9 18h6M10 22h4M12 2a7 7 0 014 12.74V17a1 1 0 01-1 1h-6a1 1 0 01-1-1v-2.26A7 7 0 0112 2z"/></svg>' },
+  { path: '/projects', label: 'nav.projects', badge: null,
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M22 19a2 2 0 01-2 2H4a2 2 0 01-2-2V5a2 2 0 012-2h5l2 3h9a2 2 0 012 2z"/></svg>' },
+  { path: '/tasks', label: 'nav.tasks', badge: null,
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>' },
+]
+
+const secondaryNav = [
+  { path: '/knowledge', label: 'nav.knowledge',
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 016.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 014 19.5v-15A2.5 2.5 0 016.5 2z"/></svg>' },
+  { path: '/audit', label: 'nav.audit',
+    svg: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M9 11l3 3L22 4"/><path d="M21 12v7a2 2 0 01-2 2H5a2 2 0 01-2-2V5a2 2 0 012-2h11"/></svg>' },
+]
+</script>
+
+<style scoped>
+.df-sidebar {
+  width: 192px;
+  min-width: 192px;
+  background: var(--df-sidebar-bg);
+  border-right: 0.5px solid var(--df-border);
+  display: flex;
+  flex-direction: column;
+  position: relative;
+  user-select: none;
+}
+
+/* — Logo — */
+.sidebar-brand {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 14px 16px 12px;
+  border-bottom: 0.5px solid var(--df-border);
+}
+.brand-mark {
+  width: 28px; height: 28px;
+  display: flex; align-items: center; justify-content: center;
+  background: var(--df-accent-bg);
+  border: 0.5px solid var(--df-border);
+}
+.brand-text {
+  font-size: 15px;
+  font-weight: 500;
+  letter-spacing: -0.3px;
+  color: var(--df-text);
+}
+.brand-version {
+  font-family: var(--df-font-mono);
+  font-size: 10px;
+  color: var(--df-text-dim);
+  background: rgba(255,255,255,0.04);
+  padding: 1px 6px;
+  border-radius: var(--df-radius-xs);
+  margin-left: auto;
+}
+
+/* — Nav — */
+.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 8px; }
+
+.nav-group { margin-bottom: 2px; }
+.nav-group-label {
+  display: block;
+  padding: 8px 10px 4px;
+  font-size: 9px;
+  font-weight: 500;
+  text-transform: uppercase;
+  letter-spacing: 1.2px;
+  color: var(--df-text-dim);
+}
+
+.nav-divider {
+  height: 0.5px;
+  background: var(--df-border);
+  margin: 6px 12px;
+}
+
+.nav-link {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 5px 10px;
+  margin: 1px 0;
+  border-radius: var(--df-radius-sm);
+  color: var(--df-text-secondary);
+  text-decoration: none;
+  font-size: 12px;
+  font-weight: 450;
+  transition: all 0.18s var(--df-ease);
+  position: relative;
+}
+
+.nav-link:hover {
+  background: var(--df-sidebar-hover);
+  color: var(--df-text);
+}
+.nav-link--active {
+  background: var(--df-sidebar-active);
+  color: var(--df-accent);
+  font-weight: 500;
+}
+.nav-link--active::before {
+  content: '';
+  position: absolute;
+  left: -10px;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 3px;
+  height: 16px;
+  background: var(--df-accent);
+  border-radius: 0 3px 3px 0;
+}
+
+.nav-link-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+  opacity: 0.7;
+  flex-shrink: 0;
+}
+.nav-link--active .nav-link-icon { opacity: 1; }
+
+.nav-link-text { flex: 1; }
+
+.nav-link-badge {
+  font-family: var(--df-font-mono);
+  font-size: 10px;
+  font-weight: 500;
+  padding: 1px 6px;
+  border-radius: var(--df-radius);
+  min-width: 18px;
+  text-align: center;
+  background: var(--df-accent);
+  color: #fff;
+  line-height: 1.4;
+}
+
+/* — AI Toggle Button — */
+.ai-toggle-btn {
+  cursor: pointer;
+  border: none;
+  background: transparent;
+  width: 100%;
+  font: inherit;
+  text-align: left;
+  appearance: none;
+  -webkit-appearance: none;
+}
+.ai-toggle-btn--active {
+  color: var(--df-accent);
+  background: var(--df-sidebar-active);
+}
+.ai-toggle-shortcut {
+  font-family: var(--df-font-mono);
+  font-size: 9px;
+  color: var(--df-text-dim);
+  background: rgba(255,255,255,0.04);
+  padding: 1px 5px;
+  border-radius: var(--df-radius-sm);
+}
+
+/* — Footer — */
+.sidebar-footer {
+  padding: 6px 8px;
+  border-top: 0.5px solid var(--df-border);
+}
+
+.sidebar-status {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 10px;
+  margin-bottom: 1px;
+}
+.status-dot {
+  width: 6px; height: 6px;
+  border-radius: 50%;
+  background: var(--df-success);
+  animation: pulseGlow 3s ease-in-out infinite;
+}
+.status-text {
+  font-family: var(--df-font-mono);
+  font-size: 10px;
+  color: var(--df-text-dim);
+  letter-spacing: 0.3px;
+}
+
+/* ═══ Responsive ═══ */
+@media (max-width: 768px) {
+  .df-sidebar { width: 56px; min-width: 56px; }
+  .brand-text, .brand-version, .nav-group-label, .nav-link-text,
+  .nav-link-badge, .sidebar-status, .status-text, .ai-toggle-shortcut { display: none; }
+  .sidebar-brand { padding: 12px 10px 10px; justify-content: center; }
+  .brand-mark { width: 32px; height: 32px; }
+  .nav-link { justify-content: center; padding: 8px 0; }
+  .nav-divider { margin: 4px 8px; }
+  .nav-link--active::before { display: none; }
+}
+</style>