remove frosted glass theme in mobile

src/styles/global.css

@@ -254,31 +254,18 @@
 
 @media (max-width: 768px) {
   .glass-card, .glass-nav {
-    /* 100% remove expensive blur filters */
+    /* Completely remove blur, gradients, and heavy shadows for maximum mobile performance */
     backdrop-filter: none !important;
     -webkit-backdrop-filter: none !important;
     
-    /* Simulate glass sheen using a static gradient and almost opaque background */
-    background: linear-gradient(
-      135deg, 
-      rgba(255, 255, 255, 0.96) 0%, 
-      rgba(255, 255, 255, 0.88) 100%
-    ) !important;
-    border: 1px solid rgba(255, 255, 255, 0.4) !important;
-    box-shadow: 
-      0 4px 20px rgba(0, 0, 0, 0.05), 
-      inset 0 1px 1px rgba(255, 255, 255, 0.6) !important;
+    background: rgba(255, 255, 255, 0.95) !important;
+    border: 1px solid rgba(0, 0, 0, 0.05) !important;
+    box-shadow: none !important;
   }
   
   .dark .glass-card, .dark .glass-nav {
-    background: linear-gradient(
-      135deg, 
-      rgba(22, 22, 26, 0.96) 0%, 
-      rgba(14, 14, 16, 0.88) 100%
-    ) !important;
-    border: 1px solid rgba(255, 255, 255, 0.08) !important;
-    box-shadow: 
-      0 4px 20px rgba(0, 0, 0, 0.3), 
-      inset 0 1px 1px rgba(255, 255, 255, 0.05) !important;
+    background: rgba(18, 18, 20, 0.95) !important;
+    border: 1px solid rgba(255, 255, 255, 0.05) !important;
+    box-shadow: none !important;
   }
 }