diff --git a/src/pages/TaskAssistant.tsx b/src/pages/TaskAssistant.tsx
index 1607932..48b704c 100644
--- a/src/pages/TaskAssistant.tsx
+++ b/src/pages/TaskAssistant.tsx
@@ -191,13 +191,12 @@ function ChatPage() {
 
           {messages.map(msg => (
             <div key={msg.id} style={{ display: 'flex', gap: 12, marginBottom: 20, flexDirection: msg.role === 'user' ? 'row-reverse' : 'row' }}>
-                <div style={{ padding: '12px 16px', borderRadius: 12, lineHeight: 1.8, wordBreak: 'break-word', background: msg.role === 'user' ? token.colorPrimary : token.colorFillAlter, color: msg.role === 'user' ? '#fff' : token.colorText }}>
-                  {msg.role === 'assistant'
-                    ? (msg.content
-                      ? <Markdown content={msg.content + (msg.streaming ? '▊' : '')} />
-                      : <Text type="secondary" style={{ fontSize: 13 }}>思考中...</Text>)
-                    : msg.content}
-                </div>
+              <div style={{ maxWidth: '75%', minWidth: 0, padding: '12px 16px', borderRadius: 12, lineHeight: 1.8, wordBreak: 'break-word', background: msg.role === 'user' ? token.colorPrimary : token.colorFillAlter, color: msg.role === 'user' ? '#fff' : token.colorText }}>
+                {msg.role === 'assistant'
+                  ? (msg.content
+                    ? <Markdown content={msg.content + (msg.streaming ? '▊' : '')} />
+                    : <Text type="secondary" style={{ fontSize: 13 }}>思考中...</Text>)
+                  : msg.content}
               </div>
             </div>
           ))}