diff --git a/works/ai-chat-app/www/style.css b/works/ai-chat-app/www/style.css
index 46ae9bd..d261fd3 100644
--- a/works/ai-chat-app/www/style.css
+++ b/works/ai-chat-app/www/style.css
@@ -463,13 +463,6 @@ body {
   51%, 100% { opacity: 0; }
 }
 
-/* 响应式 */
-@media (min-width: 768px) {
-  .message-content {
-    max-width: 60%;
-  }
-}
-
 /* 安全区域适配（刘海屏） */
 @supports (padding: env(safe-area-inset-bottom)) {
   .input-area {