diff --git a/src/pages/index/index.ux b/src/pages/index/index.ux
index 231c271..af3e6ed 100644
--- a/src/pages/index/index.ux
+++ b/src/pages/index/index.ux
@@ -26,8 +26,8 @@
             </div>
             <text class="think-text fl{{fontLevel}}" if="{{$item.showThink}}">{{$item.think}}</text>
             <text class="chat-text fl{{fontLevel}}">{{$item.collapsed ? $item.preview : $item.text}}</text>
-            <text class="expand-chip" if="{{$item.collapsed}}">展开 ▾</text>
-            <text class="expand-chip" if="{{!$item.collapsed}}">收起 ▴</text>
+            <text class="expand-chip" if="{{$item.role === 'assistant' && $item.collapsed}}">展开 ▾</text>
+            <text class="expand-chip" if="{{$item.role === 'assistant' && !$item.collapsed}}">收起 ▴</text>
             <image class="chat-img" src="/common/dsniang.png" if="{{$item.kind === 'image'}}" />
             <div class="approve-box" if="{{$item.kind === 'approval'}}">
               <input class="approve-btn allow" type="button" value="允许" />
@@ -290,9 +290,9 @@ export default {
     } else {
       this.fontValue = Math.round(14 + (v / 100) * (22 - 14))
     }
-    const lv = Math.round((this.fontValue - 14) / 4)
-    this.fontLevel = Math.max(0, Math.min(2, lv))
-    this.fontLabel = ['小', '中', '大'][this.fontLevel]
+    const lv = Math.round((this.fontValue - 14) / 2)
+    this.fontLevel = Math.max(0, Math.min(4, lv))
+    this.fontLabel = ['最小', '小', '中', '大', '特大'][this.fontLevel]
   },
 
   confirmFont() {
@@ -551,6 +551,7 @@ export default {
 .chat-scroll {
   flex: 1;
   width: 100%;
+  flex-direction: column;
 }
 
 .chat-img {
@@ -562,6 +563,7 @@ export default {
 
 .chat-msg {
   width: 100%;
+  flex-direction: column;
   margin-bottom: 6px;
   padding: 7px 9px;
   border-radius: 10px;
@@ -732,6 +734,8 @@ export default {
 .fl0 { font-size: 15px; line-height: 21px; }
 .fl1 { font-size: 17px; line-height: 25px; }
 .fl2 { font-size: 19px; line-height: 28px; }
+.fl3 { font-size: 21px; line-height: 31px; }
+.fl4 { font-size: 23px; line-height: 34px; }
 
 /* ===== 字体大小弹窗 ===== */
 .popup {