diff --git a/static/src/app.ts b/static/src/app.ts
index a2c01fb..432b720 100644
--- a/static/src/app.ts
+++ b/static/src/app.ts
@@ -57,6 +57,7 @@ import {
     scrollToBottom as scrollToBottomHelper,
     conditionalScrollToBottom as conditionalScrollToBottomHelper,
     toggleScrollLock as toggleScrollLockHelper,
+    normalizeScrollLock,
     scrollThinkingToBottom as scrollThinkingToBottomHelper
 } from './composables/useScrollControl';
 import {
@@ -294,7 +295,7 @@ const appOptions = {
             });
         },
         
-        async mounted() {
+            async mounted() {
             debugLog('Vue应用已挂载');
             if (window.ensureCsrfToken) {
                 window.ensureCsrfToken().catch((err) => {
@@ -308,6 +309,8 @@ const appOptions = {
             await socketPromise;
             this.$nextTick(() => {
                 this.ensureScrollListener();
+                // 刷新后若无输出，自动解锁滚动锁定
+                normalizeScrollLock(this);
             });
             setupShowImageObserver();
             
diff --git a/static/src/components/chat/ChatArea.vue b/static/src/components/chat/ChatArea.vue
index 43b60a6..82fb6c4 100644
--- a/static/src/components/chat/ChatArea.vue
+++ b/static/src/components/chat/ChatArea.vue
@@ -79,7 +79,10 @@
                     </div>
                     <span class="status-text">{{ group.action.streaming ? '正在思考...' : '思考过程' }}</span>
                   </div>
-                  <div class="collapsible-content">
+                  <div
+                    class="collapsible-content"
+                    :ref="el => registerCollapseContent(group.action.blockId || `${index}-thinking-${group.actionIndex}`, el)"
+                  >
                     <div
                       class="content-inner thinking-content"
                       :ref="el => registerThinkingRef(group.action.blockId || `${index}-thinking-${group.actionIndex}`, el)"
@@ -208,7 +211,10 @@
                   </div>
                   <span class="status-text">{{ action.streaming ? '正在思考...' : '思考过程' }}</span>
                 </div>
-                <div class="collapsible-content">
+                <div
+                  class="collapsible-content"
+                  :ref="el => registerCollapseContent(action.blockId || `${index}-thinking-${actionIndex}`, el)"
+                >
                   <div
                     class="content-inner thinking-content"
                     :ref="el => registerThinkingRef(action.blockId || `${index}-thinking-${actionIndex}`, el)"
@@ -319,7 +325,10 @@
               </div>
               <span class="status-text">系统消息</span>
             </div>
-            <div class="collapsible-content">
+            <div
+              class="collapsible-content"
+              :ref="el => registerCollapseContent(`system-${index}`, el)"
+            >
               <div class="content-inner">
                 {{ msg.content }}
               </div>
@@ -359,6 +368,17 @@ const stackedBlocksEnabled = computed(() => personalization.experiments.stackedB
 const DEFAULT_GENERATING_TEXT = '生成中…';
 const rootEl = ref<HTMLElement | null>(null);
 const thinkingRefs = new Map<string, HTMLElement | null>();
+const registerCollapseContent = (key: string, el: Element | null) => {
+  if (!(el instanceof HTMLElement)) {
+    return;
+  }
+  requestAnimationFrame(() => {
+    const h = el.scrollHeight || el.offsetHeight || 0;
+    if (h > 0) {
+      el.style.setProperty('--collapse-max', `${h}px`);
+    }
+  });
+};
 
 function registerThinkingRef(key: string, el: Element | null) {
   if (el instanceof HTMLElement) {
diff --git a/static/src/components/chat/actions/ToolAction.vue b/static/src/components/chat/actions/ToolAction.vue
index a93518f..3d8c574 100644
--- a/static/src/components/chat/actions/ToolAction.vue
+++ b/static/src/components/chat/actions/ToolAction.vue
@@ -20,7 +20,10 @@
       <span class="status-text">{{ getToolStatusText(action.tool) }}</span>
       <span class="tool-desc">{{ getToolDescription(action.tool) }}</span>
     </div>
-    <div class="collapsible-content">
+    <div
+      class="collapsible-content"
+      :ref="el => registerCollapseContent && registerCollapseContent(collapseKey || action.tool.id || action.id || 'tool', el)"
+    >
       <div class="content-inner">
         <div v-if="action.tool.name === 'web_search' && action.tool.result">
           <div class="search-meta">
@@ -75,6 +78,8 @@ defineProps<{
   formatSearchTopic: (filters: Record<string, any>) => string;
   formatSearchTime: (filters: Record<string, any>) => string;
   streamingMessage: boolean;
+  registerCollapseContent?: (key: string, el: Element | null) => void;
+  collapseKey?: string;
 }>();
 
 defineEmits<{ (event: 'toggle'): void }>();
diff --git a/static/src/composables/useScrollControl.ts b/static/src/composables/useScrollControl.ts
index 8820d5e..2791c1d 100644
--- a/static/src/composables/useScrollControl.ts
+++ b/static/src/composables/useScrollControl.ts
@@ -10,6 +10,8 @@ type ScrollContext = {
   autoScrollEnabled?: boolean;
   userScrolling?: boolean;
   isOutputActive?: () => boolean;
+  streamingMessage?: boolean;
+  hasPendingToolActions?: () => boolean;
 };
 
 type ScrollOptions = {
@@ -106,6 +108,21 @@ export function toggleScrollLock(ctx: ScrollContext) {
   return nextState;
 }
 
+/**
+ * 在页面初始化/刷新后同步滚动锁定的默认状态：
+ * 仅当存在输出（流式中或有未完成工具）时才保持锁定，否则自动解锁。
+ */
+export function normalizeScrollLock(ctx: ScrollContext) {
+  const active =
+    (typeof ctx.isOutputActive === 'function' ? ctx.isOutputActive() : false) ||
+    !!ctx.streamingMessage ||
+    (typeof ctx.hasPendingToolActions === 'function' ? ctx.hasPendingToolActions() : false);
+
+  if (!active && ctx.autoScrollEnabled) {
+    ctx.chatSetScrollState?.({ autoScrollEnabled: false, userScrolling: false });
+  }
+}
+
 export function scrollThinkingToBottom(ctx: ScrollContext, blockId: string) {
   if (!blockId) {
     return;
diff --git a/static/src/styles/components/chat/_chat-area.scss b/static/src/styles/components/chat/_chat-area.scss
index b5ae702..4d1ed23 100644
--- a/static/src/styles/components/chat/_chat-area.scss
+++ b/static/src/styles/components/chat/_chat-area.scss
@@ -266,11 +266,12 @@
     overflow: hidden;
     opacity: 0;
     transition:
-        max-height 0.26s cubic-bezier(0.4, 0, 0.2, 1),
-        opacity 0.26s cubic-bezier(0.4, 0, 0.2, 1);
+        max-height 260ms cubic-bezier(0.4, 0, 0.2, 1),
+        opacity 220ms cubic-bezier(0.4, 0, 0.2, 1);
     /* 始终隐藏滚动条，避免堆叠模式展开时闪现 */
     scrollbar-width: none;
     -ms-overflow-style: none;
+    will-change: max-height, opacity;
 }
 
 .collapsible-content::-webkit-scrollbar {
@@ -278,7 +279,7 @@
 }
 
 .collapsible-block.expanded .collapsible-content {
-    max-height: 600px;
+    max-height: var(--collapse-max, 600px);
     overflow-y: auto;
     opacity: 1;
 }
@@ -439,8 +440,8 @@
 
 .stacked-block .collapsible-content {
     transition:
-        max-height 280ms cubic-bezier(0.25, 0.9, 0.3, 1),
-        opacity 220ms ease;
+        max-height 260ms cubic-bezier(0.4, 0, 0.2, 1),
+        opacity 220ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 .progress-indicator {