diff --git a/web/storyforge-web-v4/assets/app.js b/web/storyforge-web-v4/assets/app.js
index d3ba72f..fa8a2ca 100644
--- a/web/storyforge-web-v4/assets/app.js
+++ b/web/storyforge-web-v4/assets/app.js
@@ -578,15 +578,24 @@ async function loadKnowledgeDocuments(knowledgeBases) {
 async function loadDouyinAccount(accountId) {
   if (!accountId) return;
   appState.selectedAccountId = accountId;
+  const supportsAccountVideos = backendSupports("/v2/douyin/accounts/{account_id}/videos");
   const [workspace, videos] = await Promise.all([
     storyforgeFetch(`/v2/douyin/accounts/${encodeURIComponent(accountId)}/workspace`),
-    storyforgeFetch(`/v2/douyin/accounts/${encodeURIComponent(accountId)}/videos?limit=80`).catch(() => ({
-      items: [],
-      meta: {},
-      top_scored_video_ids: [],
-      latest_video_ids: [],
-      high_score_threshold: 60
-    }))
+    supportsAccountVideos
+      ? storyforgeFetch(`/v2/douyin/accounts/${encodeURIComponent(accountId)}/videos?limit=80`).catch(() => ({
+          items: [],
+          meta: {},
+          top_scored_video_ids: [],
+          latest_video_ids: [],
+          high_score_threshold: 60
+        }))
+      : Promise.resolve({
+          items: [],
+          meta: {},
+          top_scored_video_ids: [],
+          latest_video_ids: [],
+          high_score_threshold: 60
+        })
   ]);
   appState.selectedWorkspace = workspace;
   appState.selectedVideos = videos;
@@ -849,7 +858,9 @@ function getSelectedAccount() {
 
 function getHighScoreVideos(limit = 3) {
   const items = safeArray(appState.selectedVideos?.items);
-  return items
+  const fallback = safeArray(getSelectedAccount()?.video_summary?.videos);
+  const pool = items.length ? items : fallback;
+  return pool
     .slice()
     .sort((a, b) => Number(b.score?.performance_score || 0) - Number(a.score?.performance_score || 0))
     .slice(0, limit);
@@ -857,7 +868,9 @@ function getHighScoreVideos(limit = 3) {
 
 function getLatestVideos(limit = 3) {
   const items = safeArray(appState.selectedVideos?.items);
-  return items
+  const fallback = safeArray(getSelectedAccount()?.video_summary?.videos);
+  const pool = items.length ? items : fallback;
+  return pool
     .slice()
     .sort((a, b) => new Date(b.published_at || 0).getTime() - new Date(a.published_at || 0).getTime())
     .slice(0, limit);
@@ -1511,6 +1524,8 @@ function renderDiscoveryScreen() {
   const reports = safeArray(appState.selectedWorkspace?.recent_reports);
   const linkedAccounts = safeArray(appState.selectedWorkspace?.linked_accounts);
   const videos = safeArray(appState.selectedVideos?.items);
+  const fallbackVideos = safeArray(selected?.video_summary?.videos);
+  const effectiveVideos = videos.length ? videos : fallbackVideos;
   const topVideos = getHighScoreVideos(3);
   const latestVideos = getLatestVideos(2);
   const similarCandidates = safeArray(appState.lastSimilaritySearch?.candidates).slice(0, 5);
@@ -1533,7 +1548,7 @@ function renderDiscoveryScreen() {
               <div class="filter">平台：抖音</div>
               <div class="filter">账号数：${escapeHtml(formatNumber(accounts.length))}</div>
               <div class="filter">报告：${escapeHtml(formatNumber(reports.length))}</div>
-              <div class="filter">作品：${escapeHtml(formatNumber(videos.length))}</div>
+              <div class="filter">作品：${escapeHtml(formatNumber(effectiveVideos.length))}</div>
             </div>
           </div>
           <div class="side-stack">
@@ -1671,7 +1686,7 @@ function renderDiscoveryScreen() {
                 </div>
               </div>
               <div class="panel pad" style="box-shadow:none; margin-top:16px;">
-                <div class="panel-head"><div><h3>最新作品</h3><div class="panel-subtitle">优先看近期更新与窗口期题材</div></div><span class="tag">${escapeHtml(formatNumber(videos.length))} 条</span></div>
+                <div class="panel-head"><div><h3>最新作品</h3><div class="panel-subtitle">优先看近期更新与窗口期题材</div></div><span class="tag">${escapeHtml(formatNumber(effectiveVideos.length))} 条</span></div>
                 <div class="list">
                   ${latestVideos.map((video) => `
                     <div class="task-item">
@@ -2755,6 +2770,11 @@ function openAnalyzeSelectedAccountAction() {
 
 function openAnalyzeTopVideosAction() {
   const account = requireSelectedAccountRow();
+  if (!backendSupports("/v2/douyin/accounts/{account_id}/videos/analyze-top")) {
+    rememberAction("当前后端暂不支持", "这套 live collector 还没有接入高分作品批量分析。", "orange");
+    renderAll();
+    return;
+  }
   openActionModal({
     title: "分析高分作品",
     description: "对当前对标账号的高分作品批量补分析。",