diff --git a/static/src/components/chat/ChatArea.vue b/static/src/components/chat/ChatArea.vue
index ecb4077..d17a50d 100644
--- a/static/src/components/chat/ChatArea.vue
+++ b/static/src/components/chat/ChatArea.vue
@@ -131,6 +131,7 @@
                 :format-search-topic="formatSearchTopic"
                 :format-search-time="formatSearchTime"
                 :format-search-domains="formatSearchDomains"
+                @more-toggle="handleStackedMoreToggle"
               />
               <div
                 v-else-if="isActionVisible(group.action)"
@@ -914,6 +915,7 @@ function attachBounceListener() {
     const now = Date.now();
     lastUserWheelUpTs = now;
     stopScroll();
+    stopBlockExpansionAnchors();
     emit('user-scroll-intent', {
       ts: now,
       delta: deltaY,
@@ -977,6 +979,7 @@ function attachBounceListener() {
     if (shouldTreatAsUserIntent) {
       // 用户手动滚动时，立即中断 stick 引擎中可能仍在运行的动画滚动
       stopScroll();
+      stopBlockExpansionAnchors();
       lastUserDownScrollTs = now;
       emit('user-scroll-intent', {
         ts: lastUserDownScrollTs,
@@ -1078,14 +1081,6 @@ function escapeBlockSelector(value: string) {
   return value.replace(/["\\]/g, '\\$&');
 }
 
-function elementLooksStreaming(el: HTMLElement) {
-  return (
-    el.classList.contains('processing') ||
-    el.classList.contains('running') ||
-    !!el.querySelector('.processing, .running, .thinking-animation')
-  );
-}
-
 const prevExpandedBlocks = ref(new Set<string>());
 
 watch(
@@ -1102,6 +1097,10 @@ watch(
     prevExpandedBlocks.value = new Set(newSet);
 
     if (changed.size === 0) return;
+
+    // 保守策略：运行期间保持旧逻辑，由 stick-to-bottom 固定向下展开并向上滚动
+    if (props.streamingMessage) return;
+
     const container = scrollRef.value;
     if (!container) return;
 
@@ -1110,13 +1109,10 @@ watch(
         `[data-block-id="${escapeBlockSelector(id)}"]`
       ) as HTMLElement | null;
       if (el) {
-        const isExpanding = newSet.has(id);
-        const streaming = elementLooksStreaming(el);
         anchorBlockElement(el, id, {
           direction: 'auto',
-          duration: streaming ? 5000 : 260,
-          extendOnGrowth: streaming,
-          phase: isExpanding ? 'expand' : 'collapse'
+          duration: 260,
+          phase: newSet.has(id) ? 'expand' : 'collapse'
         });
       }
     }
@@ -1124,7 +1120,25 @@ watch(
   { flush: 'post' }
 );
 
+function handleStackedMoreToggle(payload: {
+  element: HTMLElement;
+  expanded: boolean;
+  stackKey: string;
+}) {
+  // 保守策略：运行期间保持旧逻辑
+  if (props.streamingMessage) return;
+
+  anchorBlockElement(payload.element, `more-${payload.stackKey}`, {
+    direction: 'auto',
+    duration: 260,
+    phase: expanded ? 'expand' : 'collapse'
+  });
+}
+
 function handleMinimalGroupToggle(payload: { groupId: string; expanded: boolean }) {
+  // 保守策略：运行期间保持旧逻辑
+  if (props.streamingMessage) return;
+
   const { groupId, expanded } = payload;
   const container = scrollRef.value;
   if (!container) return;
@@ -1132,11 +1146,9 @@ function handleMinimalGroupToggle(payload: { groupId: string; expanded: boolean
     `[data-group-id="${escapeBlockSelector(groupId)}"]`
   ) as HTMLElement | null;
   if (el) {
-    const streaming = elementLooksStreaming(el);
     anchorBlockElement(el, groupId, {
       direction: 'auto',
-      duration: streaming ? 5000 : 300,
-      extendOnGrowth: streaming,
+      duration: 300,
       phase: expanded ? 'expand' : 'collapse'
     });
   }
diff --git a/static/src/components/chat/StackedBlocks.vue b/static/src/components/chat/StackedBlocks.vue
index 37bb04e..84d1cd2 100644
--- a/static/src/components/chat/StackedBlocks.vue
+++ b/static/src/components/chat/StackedBlocks.vue
@@ -177,6 +177,16 @@ const props = defineProps<{
   formatSearchDomains: (filters: Record<string, any>) => string;
 }>();
 
+const emit = defineEmits<{
+  (
+    event: 'more-toggle',
+    payload: { element: HTMLElement; expanded: boolean; stackKey: string }
+  ): void;
+}>();
+
+let stackInstanceCounter = 0;
+const stackKey = `stacked-${++stackInstanceCounter}`;
+
 // 初始化 personalization store
 const personalizationStore = usePersonalizationStore();
 
@@ -253,6 +263,10 @@ const isToolCompleted = (action: any) => action?.tool?.status === 'completed';
 const toggleMore = () => {
   showAll.value = !showAll.value;
   scheduleMeasure();
+  const el = moreBlock.value;
+  if (el instanceof HTMLElement) {
+    emit('more-toggle', { element: el, expanded: showAll.value, stackKey });
+  }
 };
 
 const toggleBlock = (blockId: string) => {