diff --git a/apps/web/src/api/accounts.ts b/apps/web/src/api/accounts.ts
index 24209fcd2..301fc3873 100644
--- a/apps/web/src/api/accounts.ts
+++ b/apps/web/src/api/accounts.ts
@@ -1,7 +1,9 @@
 /**
- * 账号管理 Mock API
+ * 账号管理 API — ⚠️ 当前全部为 Mock 实现
+ *
+ * TODO(后端): 后端尚未提供账号管理相关 API（router.py 无 accounts 路由）。
+ * 当前所有函数均为前端 mock（内存数据 + 模拟延迟），待后端就绪后需替换为真实 API 调用。
  *
- * 模拟多平台账号绑定/解绑操作
  * 支持平台：抖音、快手、小红书、微信视频号
  */
 
@@ -71,7 +73,7 @@ export const PLATFORMS: Platform[] = [
   },
 ];
 
-/* ── Mock 数据 ───────────────────────────────────────────── */
+/* ── Mock 数据（TODO: 待后端提供账号存储后替换） ────────── */
 
 let MOCK_ACCOUNTS: Account[] = [
   {
@@ -108,11 +110,11 @@ let MOCK_ACCOUNTS: Account[] = [
   },
 ];
 
-/* ── 模拟延迟 ───────────────────────────────────────────── */
+/* ── 模拟延迟（TODO: 后端就绪后移除） ─────────────────── */
 
 const delay = (ms: number) => new Promise((r) => setTimeout(r, ms));
 
-/* ── API 函数 ───────────────────────────────────────────── */
+/* ── Mock API 函数（TODO: 替换为 apiClient 真实调用） ──── */
 
 /** 获取指定平台的账号列表 */
 export async function getAccountsByPlatform(
diff --git a/apps/web/src/pages/admin/Admin.css b/apps/web/src/pages/admin/Admin.css
index 071cb79cc..6eb0fc565 100644
--- a/apps/web/src/pages/admin/Admin.css
+++ b/apps/web/src/pages/admin/Admin.css
@@ -1,442 +1,20 @@
-/* V21 Admin 页面样式 */
+/* Admin 页面样式（Phase 3 精简）
+ *
+ * 原始 477 行 → 精简至仅保留实际使用的 class。
+ * 已迁移至 global.css / ui.css 的样式不再重复定义：
+ *   .xx-page-head       → global.css
+ *   .xx-primary-btn     → global.css
+ *   .xx-tag / .xx-card  → ui.css / global.css
+ *
+ * 以下 class 仅被 AdminComingSoon.tsx 使用。
+ */
 
-/* 页面容器 */
-.dashboard-page,
-.analytics-page,
-.user-management-page,
-.log-viewer-page,
-.system-monitor-page,
 .admin-coming-soon-page {
   padding: 32px;
   max-width: 1400px;
   margin: 0 auto;
 }
 
-/* 页面头部 */
-.xx-page-head {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-xl);
-  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.09);
-  padding: 32px 40px;
-  margin-bottom: 32px;
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-}
-
-.xx-page-head-content {
-  display: flex;
-  flex-direction: column;
-  gap: 8px;
-}
-
-.xx-page-head h2 {
-  font-size: 28px;
-  font-weight: 900;
-  color: var(--slate, #0f172a);
-  margin: 0;
-  letter-spacing: -0.02em;
-}
-
-.xx-page-head p {
-  font-size: 15px;
-  color: var(--muted, #64748b);
-  margin: 0;
-}
-
-.xx-page-head-actions {
-  display: flex;
-  gap: 12px;
-  align-items: center;
-}
-
-/* 简化页面头部（无操作按钮） */
-.xx-page-head-simple {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-xl);
-  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.09);
-  padding: 32px 40px;
-  margin-bottom: 32px;
-}
-
-.xx-page-head-simple h2 {
-  font-size: 28px;
-  font-weight: 900;
-  color: var(--slate, #0f172a);
-  margin: 0 0 8px;
-  letter-spacing: -0.02em;
-}
-
-.xx-page-head-simple p {
-  font-size: 15px;
-  color: var(--muted, #64748b);
-  margin: 0;
-}
-
-/* 统计卡片网格 - 4列 */
-.xx-grid-4 {
-  display: grid;
-  grid-template-columns: repeat(4, 1fr);
-  gap: 24px;
-  margin-bottom: 32px;
-}
-
-@media (max-width: 1200px) {
-  .xx-grid-4 {
-    grid-template-columns: repeat(2, 1fr);
-  }
-}
-
-@media (max-width: 768px) {
-  .xx-grid-4 {
-    grid-template-columns: 1fr;
-  }
-}
-
-/* 统计卡片 */
-.xx-stat-card {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  padding: 24px;
-  transition: all 0.3s;
-}
-
-.xx-stat-card:hover {
-  transform: translateY(-2px);
-  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
-}
-
-.xx-stat-card-header {
-  display: flex;
-  justify-content: space-between;
-  align-items: flex-start;
-  margin-bottom: 16px;
-}
-
-.xx-stat-card-icon {
-  width: 48px;
-  height: 48px;
-  border-radius: var(--radius-md);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  font-size: 22px;
-}
-
-.xx-stat-card-icon.primary {
-  background: linear-gradient(135deg, #6366f1, #4f46e5);
-  color: white;
-}
-
-.xx-stat-card-icon.success {
-  background: linear-gradient(135deg, #34d399, #10b981);
-  color: white;
-}
-
-.xx-stat-card-icon.warning {
-  background: linear-gradient(135deg, #fbbf24, #f59e0b);
-  color: white;
-}
-
-.xx-stat-card-icon.purple {
-  background: linear-gradient(135deg, #a78bfa, #8b5cf6);
-  color: white;
-}
-
-.xx-stat-card-icon.info {
-  background: linear-gradient(135deg, #60a5fa, #3b82f6);
-  color: white;
-}
-
-.xx-stat-card-icon.orange {
-  background: linear-gradient(135deg, #fb923c, #f97316);
-  color: white;
-}
-
-.xx-stat-card-label {
-  font-size: 14px;
-  color: var(--muted, #64748b);
-  font-weight: 500;
-  margin-bottom: 8px;
-}
-
-.xx-stat-card-value {
-  font-size: 32px;
-  font-weight: 900;
-  color: var(--slate, #0f172a);
-  line-height: 1.2;
-  letter-spacing: -0.02em;
-}
-
-.xx-stat-card-value.primary {
-  color: var(--indigo, #4f46e5);
-}
-
-.xx-stat-card-value.success {
-  color: var(--green, #10b981);
-}
-
-.xx-stat-card-value.warning {
-  color: var(--amber, #f59e0b);
-}
-
-.xx-stat-card-value.purple {
-  color: #8b5cf6;
-}
-
-.xx-stat-card-growth {
-  font-size: 13px;
-  color: var(--green, #10b981);
-  font-weight: 600;
-  margin-top: 8px;
-  display: flex;
-  align-items: center;
-  gap: 4px;
-}
-
-/* 数据表格 */
-.xx-table-wrapper {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  overflow: hidden;
-}
-
-.xx-table-wrapper .ant-table {
-  background: transparent;
-}
-
-.xx-table-wrapper .ant-table-thead > tr > th {
-  background: rgba(248, 250, 252, 0.8);
-  font-weight: 800;
-  font-size: 13px;
-  color: var(--slate, #0f172a);
-  text-transform: uppercase;
-  letter-spacing: 0.05em;
-  padding: 16px 20px;
-}
-
-.xx-table-wrapper .ant-table-tbody > tr > td {
-  padding: 16px 20px;
-  font-size: 14px;
-}
-
-.xx-table-wrapper .ant-table-tbody > tr:hover > td {
-  background: rgba(79, 70, 229, 0.03);
-}
-
-/* V21 按钮 */
-.xx-primary-btn {
-  background: linear-gradient(135deg, #6366f1, #4f46e5) !important;
-  color: white !important;
-  border: none !important;
-  border-radius: var(--radius-md) !important;
-  font-weight: 700 !important;
-  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.25) !important;
-  transition: all 0.2s !important;
-}
-
-.xx-primary-btn:hover {
-  box-shadow: 0 12px 28px rgba(79, 70, 229, 0.3) !important;
-  transform: translateY(-1px);
-}
-
-.xx-ghost-btn {
-  background: white !important;
-  border: 1px solid rgba(226, 232, 240, 0.95) !important;
-  color: var(--slate, #0f172a) !important;
-  border-radius: var(--radius-md) !important;
-  font-weight: 600 !important;
-  transition: all 0.2s !important;
-}
-
-.xx-ghost-btn:hover {
-  border-color: var(--indigo, #4f46e5) !important;
-  color: var(--indigo, #4f46e5) !important;
-}
-
-/* V21 输入框 */
-.xx-search-input {
-  border-radius: var(--radius-md) !important;
-  border: 1px solid rgba(226, 232, 240, 0.95) !important;
-  padding: 8px 16px !important;
-}
-
-.xx-search-input:hover,
-.xx-search-input:focus {
-  border-color: var(--indigo, #4f46e5) !important;
-  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1) !important;
-}
-
-/* V21 Tag */
-.xx-tag {
-  border-radius: var(--radius-xs) !important;
-  font-weight: 600 !important;
-  font-size: 12px !important;
-  padding: 4px 10px !important;
-}
-
-.xx-tag.info {
-  background: rgba(59, 130, 246, 0.1) !important;
-  color: #3b82f6 !important;
-  border: 1px solid rgba(59, 130, 246, 0.2) !important;
-}
-
-.xx-tag.success {
-  background: rgba(16, 185, 129, 0.1) !important;
-  color: #10b981 !important;
-  border: 1px solid rgba(16, 185, 129, 0.2) !important;
-}
-
-.xx-tag.warning {
-  background: rgba(245, 158, 11, 0.1) !important;
-  color: #f59e0b !important;
-  border: 1px solid rgba(245, 158, 11, 0.2) !important;
-}
-
-.xx-tag.error {
-  background: rgba(239, 68, 68, 0.1) !important;
-  color: #ef4444 !important;
-  border: 1px solid rgba(239, 68, 68, 0.2) !important;
-}
-
-.xx-tag.debug {
-  background: rgba(100, 116, 139, 0.1) !important;
-  color: #64748b !important;
-  border: 1px solid rgba(100, 116, 139, 0.2) !important;
-}
-
-/* V21 Progress */
-.xx-progress-primary .ant-progress-circle .ant-progress-text {
-  color: var(--indigo, #4f46e5) !important;
-  font-weight: 700 !important;
-}
-
-.xx-progress-success .ant-progress-circle .ant-progress-text {
-  color: var(--green, #10b981) !important;
-  font-weight: 700 !important;
-}
-
-.xx-progress-warning .ant-progress-circle .ant-progress-text {
-  color: var(--amber, #f59e0b) !important;
-  font-weight: 700 !important;
-}
-
-/* 图表容器 */
-.xx-chart-container {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  padding: 24px;
-}
-
-.xx-chart-container .ant-card-head {
-  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
-  padding: 20px 24px;
-}
-
-.xx-chart-container .ant-card-head-title {
-  font-weight: 800;
-  font-size: 17px;
-  color: var(--slate, #0f172a);
-}
-
-/* 筛选器区域 */
-.xx-filter-bar {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  padding: 20px 24px;
-  margin-bottom: 24px;
-  display: flex;
-  flex-wrap: wrap;
-  gap: 16px;
-  align-items: center;
-}
-
-/* 资源监控卡片 */
-.xx-resource-card {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  padding: 24px;
-  text-align: center;
-}
-
-.xx-resource-card-icon {
-  width: 64px;
-  height: 64px;
-  border-radius: var(--radius-md);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  margin: 0 auto 16px;
-  font-size: 28px;
-}
-
-.xx-resource-card-label {
-  font-size: 14px;
-  color: var(--muted, #64748b);
-  font-weight: 600;
-  margin-bottom: 16px;
-}
-
-/* 日期选择器 */
-.xx-date-picker {
-  border-radius: var(--radius-md) !important;
-}
-
-/* Drawer */
-.xx-drawer .ant-drawer-header {
-  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
-  padding: 20px 24px;
-}
-
-.xx-drawer .ant-drawer-title {
-  font-weight: 800;
-  font-size: 18px;
-  color: var(--slate, #0f172a);
-}
-
-/* 日志详情 */
-.xx-log-detail {
-  padding: 4px 0;
-}
-
-.xx-log-detail-label {
-  font-size: 13px;
-  font-weight: 700;
-  color: var(--slate, #0f172a);
-  margin-bottom: 4px;
-}
-
-.xx-log-detail-value {
-  font-size: 14px;
-  color: var(--muted, #64748b);
-  background: rgba(248, 250, 252, 0.8);
-  padding: 12px;
-  border-radius: var(--radius-sm);
-  margin-bottom: 16px;
-}
-
-.xx-log-detail-code {
-  font-family: "JetBrains Mono", "Fira Code", monospace;
-  background: rgba(248, 250, 252, 0.8);
-  padding: 12px;
-  border-radius: var(--radius-sm);
-  white-space: pre-wrap;
-  word-break: break-all;
-}
-
-/* Result 页面居中 */
 .xx-result-center {
   display: flex;
   justify-content: center;
@@ -447,31 +25,3 @@
 .xx-result-center .ant-result {
   padding: 48px;
 }
-
-/* 刷新时间显示 */
-.xx-refresh-time {
-  font-size: 13px;
-  color: var(--muted, #64748b);
-  margin-right: 12px;
-}
-
-/* 图表配色覆盖 */
-.recharts-text {
-  fill: #64748b !important;
-  font-size: 12px !important;
-}
-
-.recharts-cartesian-grid-horizontal line,
-.recharts-cartesian-grid-vertical line {
-  stroke: rgba(226, 232, 240, 0.8) !important;
-}
-
-/* 图表 Legend */
-.recharts-legend-wrapper {
-  padding-top: 16px !important;
-}
-
-.recharts-legend-item-text {
-  color: #64748b !important;
-  font-size: 13px !important;
-}
diff --git a/apps/web/src/pages/titles/TitleLibrary.tsx b/apps/web/src/pages/titles/TitleLibrary.tsx
index 36eac804a..740f9f62c 100644
--- a/apps/web/src/pages/titles/TitleLibrary.tsx
+++ b/apps/web/src/pages/titles/TitleLibrary.tsx
@@ -36,36 +36,24 @@ type TitleType = "hot" | "normal" | "creative";
 type Industry = "general" | "food" | "tech" | "beauty" | "education" | "travel";
 type Frequency = "all" | "high" | "medium" | "low";
 
-interface CategoryItem {
-  id: string;
-  name: string;
-  count: number;
-}
-
 interface TitleData {
   id: string;
   content: string;
   type: TitleType;
   industry: Industry;
+  category: string;
   usageCount: number;
   isFavorited: boolean;
   createdAt: string;
 }
 
-/* ============================================================
- * Mock 数据
- * ============================================================ */
-// TODO: 分类数据当前为前端硬编码 mock，待后端提供标题分类 API 后替换
-const MOCK_CATEGORIES: CategoryItem[] = [
-  { id: "cat-all", name: "全部标题", count: 0 },
-];
-
 /** 后端 TitleItem → 前端 TitleData 映射 */
 const toTitleData = (item: TitleItem): TitleData => ({
   id: item.id,
   content: item.content,
   type: (item.category as TitleType) || "normal",
   industry: "general",
+  category: item.category || "未分类",
   usageCount: 0,
   isFavorited: false,
   createdAt: item.created_at?.slice(0, 10) || "",
@@ -246,9 +234,8 @@ const TitleCard: React.FC<{
 const TitleLibrary: React.FC = () => {
   const queryClient = useQueryClient();
 
-  /* 分类数据 */
-  const [categories, setCategories] = useState<CategoryItem[]>(MOCK_CATEGORIES);
-  const [activeCatId, setActiveCatId] = useState<string>(MOCK_CATEGORIES[0].id);
+  /* 分类数据 — 从真实标题数据动态派生 */
+  const [activeCatId, setActiveCatId] = useState<string>("cat-all");
 
   /* 标题数据 — 真实 API */
   const { data: apiTitles = [] } = useQuery({
@@ -261,6 +248,23 @@ const TitleLibrary: React.FC = () => {
     [apiTitles],
   );
 
+  /* 从真实标题数据动态派生分类（无需后端分类 API） */
+  const categories = useMemo(() => {
+    const cats = new Map<string, number>();
+    apiTitles.forEach((t) => {
+      const cat = t.category || "未分类";
+      cats.set(cat, (cats.get(cat) || 0) + 1);
+    });
+    return [
+      { id: "cat-all", name: "全部标题", count: apiTitles.length },
+      ...Array.from(cats.entries()).map(([name, count]) => ({
+        id: `cat-${name}`,
+        name,
+        count,
+      })),
+    ];
+  }, [apiTitles]);
+
   /* CRUD mutations */
   const createMutation = useMutation({
     mutationFn: (content: string) => createTitle({ content }),
@@ -297,10 +301,6 @@ const TitleLibrary: React.FC = () => {
   const [editingId, setEditingId] = useState<string | null>(null);
   const [editText, setEditText] = useState("");
 
-  /* 新建分类 */
-  const [createCatModalOpen, setCreateCatModalOpen] = useState(false);
-  const [newCatName, setNewCatName] = useState("");
-
   /* 新建标题 */
   const [createTitleModalOpen, setCreateTitleModalOpen] = useState(false);
   const [newTitleContent, setNewTitleContent] = useState("");
@@ -318,19 +318,11 @@ const TitleLibrary: React.FC = () => {
   const filteredTitles = useMemo(() => {
     let list = titles;
 
-    /* 按分类过滤（"全部标题" 不过滤） */
+    /* 按分类过滤（"全部标题" 不过滤）— 直接匹配后端 category 字段 */
     if (activeCatId !== "cat-all") {
       const catName = activeCategory?.name || "";
-      const catToIndustry: Record<string, Industry> = {
-        美食探店: "food",
-        科技数码: "tech",
-        生活日常: "general",
-        美妆穿搭: "beauty",
-        教育学习: "education",
-      };
-      const mappedIndustry = catToIndustry[catName];
-      if (mappedIndustry) {
-        list = list.filter((t) => t.industry === mappedIndustry);
+      if (catName) {
+        list = list.filter((t) => t.category === catName);
       }
     }
 
@@ -424,32 +416,6 @@ const TitleLibrary: React.FC = () => {
     [deleteMutation],
   );
 
-  /* 新建分类 */
-  const handleCreateCategory = () => {
-    if (!newCatName.trim()) {
-      message.warning("请输入分类名称");
-      return;
-    }
-    const cat: CategoryItem = {
-      id: `cat-${Date.now()}`,
-      name: newCatName.trim(),
-      count: 0,
-    };
-    setCategories((prev) => [...prev, cat]);
-    setActiveCatId(cat.id);
-    setCreateCatModalOpen(false);
-    setNewCatName("");
-    message.success(`分类 "${cat.name}" 创建成功`);
-  };
-
-  /* 删除分类 */
-  const handleDeleteCategory = (id: string) => {
-    setCategories((prev) => prev.filter((c) => c.id !== id));
-    if (activeCatId === id) {
-      setActiveCatId("cat-all");
-    }
-    message.success("分类已删除");
-  };
 
   /* 新建标题 */
   const handleCreateTitle = () => {
@@ -537,38 +503,12 @@ const TitleLibrary: React.FC = () => {
                   </h4>
                   <span>{cat.count} 条</span>
                 </div>
-                {cat.id !== "cat-all" && (
-                  <Popconfirm
-                    title={`确定删除分类 "${cat.name}"？`}
-                    onConfirm={(e) => {
-                      e?.stopPropagation();
-                      handleDeleteCategory(cat.id);
-                    }}
-                    onCancel={(e) => e?.stopPropagation()}
-                    okText="删除"
-                    cancelText="取消"
-                  >
-                    <button
-                      className="xx-title-category-delete"
-                      onClick={(e) => e.stopPropagation()}
-                      title="删除分类"
-                    >
-                      <DeleteOutlined />
-                    </button>
-                  </Popconfirm>
-                )}
+
               </div>
             </div>
           ))}
 
-          {/* 新建分类 */}
-          <div
-            className="xx-title-category-add"
-            onClick={() => setCreateCatModalOpen(true)}
-          >
-            <PlusOutlined />
-            新建分类
-          </div>
+          {/* TODO: 新建分类功能待后端分类 API 就绪后启用 */}
         </div>
 
         {/* ─── 右侧：内容区 ─── */}
@@ -674,34 +614,7 @@ const TitleLibrary: React.FC = () => {
         </div>
       </div>
 
-      {/* ─── 新建分类弹窗 ─── */}
-      <AntModal
-        title="新建分类"
-        open={createCatModalOpen}
-        onCancel={() => setCreateCatModalOpen(false)}
-        onOk={handleCreateCategory}
-        okText="创建"
-        cancelText="取消"
-        destroyOnClose
-      >
-        <div style={{ padding: "8px 0" }}>
-          <div
-            style={{
-              marginBottom: 6,
-              fontSize: "var(--font-size-sm)",
-              color: "var(--text-secondary)",
-            }}
-          >
-            分类名称
-          </div>
-          <Input
-            placeholder="请输入分类名称"
-            value={newCatName}
-            onChange={(e) => setNewCatName(e.target.value)}
-            maxLength={30}
-          />
-        </div>
-      </AntModal>
+
 
       {/* ─── 新建标题弹窗 ─── */}
       <AntModal