diff --git a/prototype/admin-index.html b/prototype/admin-index.html
index 2addcae..fcd650a 100644
--- a/prototype/admin-index.html
+++ b/prototype/admin-index.html
@@ -7,16 +7,18 @@
     <script src="https://cdn.tailwindcss.com"></script>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
     <style>
-        /* 平铺网格布局 */
+        /* 平铺网格布局 - 单列布局保证桌面端宽度 */
         .prototype-grid {
             display: grid;
-            grid-template-columns: repeat(2, 1fr);
-            gap: 16px;
-            padding: 16px;
+            grid-template-columns: 1fr;
+            gap: 20px;
+            padding: 20px;
+            max-width: 1400px;
+            margin: 0 auto;
         }
         .prototype-iframe {
             width: 100%;
-            height: 1000px;
+            height: 800px;
             border: 1px solid #e5e7eb;
             border-radius: 12px;
             background: white;
@@ -38,18 +40,6 @@
         .iframe-container {
             position: relative;
         }
-        /* 大屏：3列平铺 */
-        @media (min-width: 1600px) {
-            .prototype-grid {
-                grid-template-columns: repeat(3, 1fr);
-            }
-        }
-        /* 小屏：1列平铺 */
-        @media (max-width: 768px) {
-            .prototype-grid {
-                grid-template-columns: 1fr;
-            }
-        }
     </style>
 </head>
 <body class="bg-gray-100">
@@ -62,7 +52,7 @@
             </div>
             <div class="flex items-center gap-4">
                 <span class="bg-blue-500/30 px-3 py-1 rounded-full text-sm">
-                    <i class="fas fa-th mr-1"></i>2列网格
+                    <i class="fas fa-list mr-1"></i>单列平铺
                 </span>
                 <span class="bg-green-500/30 px-3 py-1 rounded-full text-sm">
                     <i class="fas fa-check-circle mr-1"></i>全部加载
diff --git a/prototype/screenshots/03-single-column-layout.png b/prototype/screenshots/03-single-column-layout.png
new file mode 100644
index 0000000..55fbbdc
Binary files /dev/null and b/prototype/screenshots/03-single-column-layout.png differ
