diff --git a/static/src/app/methods/conversation.ts b/static/src/app/methods/conversation.ts
index a33572e..82e92f3 100644
--- a/static/src/app/methods/conversation.ts
+++ b/static/src/app/methods/conversation.ts
@@ -179,6 +179,36 @@ export const conversationMethods = {
             return;
         }
 
+        // 应用个性化设置中的默认模型和思考模式
+        try {
+            const { usePersonalizationStore } = await import('../../stores/personalization');
+            const personalizationStore = usePersonalizationStore();
+
+            if (personalizationStore.loaded) {
+                const defaultRunMode = personalizationStore.form.default_run_mode;
+                const defaultModel = personalizationStore.form.default_model;
+
+                if (defaultRunMode) {
+                    this.runMode = defaultRunMode;
+                    debugLog('应用默认运行模式:', defaultRunMode);
+                }
+
+                if (defaultModel) {
+                    this.currentModelKey = defaultModel;
+                    debugLog('应用默认模型:', defaultModel);
+                }
+
+                // 根据默认运行模式设置思考模式
+                if (defaultRunMode === 'thinking') {
+                    this.thinkingMode = true;
+                } else if (defaultRunMode === 'fast') {
+                    this.thinkingMode = false;
+                }
+            }
+        } catch (error) {
+            console.warn('应用个性化默认设置失败:', error);
+        }
+
         // 有任务或后台子智能体运行时，提示用户确认切换
         try {
             const { useTaskStore } = await import('../../stores/task');
@@ -294,6 +324,36 @@ export const conversationMethods = {
         });
         this.logMessageState('createNewConversation:start');
 
+        // 应用个性化设置中的默认模型和思考模式
+        try {
+            const { usePersonalizationStore } = await import('../../stores/personalization');
+            const personalizationStore = usePersonalizationStore();
+
+            if (personalizationStore.loaded) {
+                const defaultRunMode = personalizationStore.form.default_run_mode;
+                const defaultModel = personalizationStore.form.default_model;
+
+                if (defaultRunMode) {
+                    this.runMode = defaultRunMode;
+                    debugLog('应用默认运行模式:', defaultRunMode);
+                }
+
+                if (defaultModel) {
+                    this.currentModelKey = defaultModel;
+                    debugLog('应用默认模型:', defaultModel);
+                }
+
+                // 根据默认运行模式设置思考模式
+                if (defaultRunMode === 'thinking') {
+                    this.thinkingMode = true;
+                } else if (defaultRunMode === 'fast') {
+                    this.thinkingMode = false;
+                }
+            }
+        } catch (error) {
+            console.warn('应用个性化默认设置失败:', error);
+        }
+
         // 检查是否有运行中的任务，如果有则提示用户
         let hasActiveTask = false;
         try {
diff --git a/static/src/app/methods/ui.ts b/static/src/app/methods/ui.ts
index 853410a..7495341 100644
--- a/static/src/app/methods/ui.ts
+++ b/static/src/app/methods/ui.ts
@@ -1118,11 +1118,34 @@ export const uiMethods = {
             // 加载个性化设置
             const personalizationStore = usePersonalizationStore();
             if (!personalizationStore.loaded && !personalizationStore.loading) {
-                personalizationStore.fetchPersonalization().catch(err => {
+                await personalizationStore.fetchPersonalization().catch(err => {
                     console.warn('加载个性化设置失败:', err);
                 });
             }
 
+            // 应用个性化设置中的默认模型和思考模式
+            if (personalizationStore.loaded) {
+                const defaultRunMode = personalizationStore.form.default_run_mode;
+                const defaultModel = personalizationStore.form.default_model;
+
+                if (defaultRunMode) {
+                    this.runMode = defaultRunMode;
+                    debugLog('应用默认运行模式:', defaultRunMode);
+                }
+
+                if (defaultModel) {
+                    this.currentModelKey = defaultModel;
+                    debugLog('应用默认模型:', defaultModel);
+                }
+
+                // 根据默认运行模式设置思考模式
+                if (defaultRunMode === 'thinking') {
+                    this.thinkingMode = true;
+                } else if (defaultRunMode === 'fast') {
+                    this.thinkingMode = false;
+                }
+            }
+
             const focusPromise = this.focusFetchFiles();
             const todoPromise = this.fileFetchTodoList();
             let treePromise: Promise<any> | null = null;
diff --git a/static/src/components/chat/ChatArea.vue b/static/src/components/chat/ChatArea.vue
index d8129ed..74d3dce 100644
--- a/static/src/components/chat/ChatArea.vue
+++ b/static/src/components/chat/ChatArea.vue
@@ -60,6 +60,8 @@
               :format-search-time="formatSearchTime"
               :format-search-domains="formatSearchDomains"
               :render-markdown="renderMarkdown"
+              :register-thinking-ref="registerThinkingRef"
+              :handle-thinking-scroll="props.handleThinkingScroll"
             />
           </template>
           <template v-else-if="stackedBlocksEnabled">
diff --git a/static/src/components/chat/MinimalBlocks.vue b/static/src/components/chat/MinimalBlocks.vue
index 8dd4c2f..05071a5 100644
--- a/static/src/components/chat/MinimalBlocks.vue
+++ b/static/src/components/chat/MinimalBlocks.vue
@@ -43,7 +43,12 @@
               </div>
               <div class="step-content">
                 <div v-if="step.type === 'thinking'" class="step-body">
-                  <div class="thinking-content" v-html="renderContent(step.content)"></div>
+                  <div
+                    class="thinking-content"
+                    :ref="el => registerThinking(step.id, el)"
+                    @scroll="handleScroll(step.id, $event)"
+                    v-html="renderContent(step.content)"
+                  ></div>
                 </div>
                 <div v-else-if="step.type === 'tool'" class="step-body">
                   <div class="step-header">{{ getToolName(step.action) }}</div>
@@ -117,6 +122,8 @@ const props = defineProps<{
   formatSearchTime?: (filters: Record<string, any>) => string;
   formatSearchDomains?: (filters: Record<string, any>) => string;
   renderMarkdown?: (content: string, isStreaming: boolean) => string;
+  registerThinkingRef?: (key: string, el: Element | null) => void;
+  handleThinkingScroll?: (blockId: string, event: Event) => void;
 }>();
 
 const personalizationStore = usePersonalizationStore();
@@ -330,6 +337,18 @@ const escapeHtml = (text: string) => {
   return div.innerHTML;
 };
 
+const registerThinking = (key: string, el: Element | null) => {
+  if (typeof props.registerThinkingRef === 'function') {
+    props.registerThinkingRef(key, el);
+  }
+};
+
+const handleScroll = (blockId: string, event: Event) => {
+  if (typeof props.handleThinkingScroll === 'function') {
+    props.handleThinkingScroll(blockId, event);
+  }
+};
+
 watch(() => props.actions, () => {
   // 简化：不需要动态更新高度
 }, { deep: true });
@@ -461,17 +480,21 @@ watch(() => props.actions, () => {
   align-items: center;
   flex-shrink: 0;
   padding-top: 2px;
+  align-self: stretch; /* 填充整个 step-item 的高度 */
 }
 
 .step-icon {
   flex-shrink: 0;
+  color: var(--claude-text-tertiary); /* 和竖线、字体一样的灰色 */
 }
 
 .step-line {
   width: 2px;
-  flex: 1;
+  flex: 1; /* 自动填充剩余空间 */
   background: var(--claude-border);
   margin-top: 4px;
+  margin-bottom: -14px; /* 延伸到下一个 step-item，保持上下距离 SVG 相等 */
+  flex-shrink: 0;
 }
 
 /* 最后一个步骤隐藏竖线 */
@@ -511,22 +534,9 @@ watch(() => props.actions, () => {
   overflow-y: auto;
   margin: 0;
   padding: 0;
-  /* 让第一行文字紧贴顶部 */
   display: block;
 }
 
-.thinking-content::before {
-  content: '';
-  display: block;
-  margin-top: calc((1.7em - 1em) / -2);
-}
-
-.thinking-content::after {
-  content: '';
-  display: block;
-  margin-bottom: calc((1.7em - 1em) / -2);
-}
-
 /* 工具内容 */
 .step-header {
   font-size: 12px;