优化Ai响应样式

css/chat.css

@@ -114,6 +114,18 @@ button:hover {
     background-color: #0056b3;
 }
 
+.typing {
+    color: #aaa;
+    font-style: italic;
+    animation: blink 1s steps(1) infinite;
+}
+
+@keyframes blink {
+    50% {
+      opacity: 0.3;
+    }
+}
+
 @keyframes slideUp {
     from {
         transform: translateY(100%);