'移动端目录按钮优化'

public/css/style.css

@@ -533,10 +533,12 @@ body {
     cursor: pointer;
     box-shadow: var(--shadow-lg);
     z-index: 1001;
+    opacity: 0.3;
     transition: all 0.3s ease;
 }
 
 .toggle-sidebar-btn:hover {
+    opacity: 1;
     background: var(--primary-hover);
     transform: scale(1.1);
 }
@@ -930,7 +932,6 @@ body {
         height: 56px !important;
         font-size: 1.7rem !important;
         box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4) !important;
-        opacity: 0.95 !important;
         z-index: 1001 !important;
     }