fix(admin-ui): restore platform order create form grid layout

public/css/admin-base.css

@@ -89,6 +89,38 @@ a:hover{text-decoration:underline;}
 
 .badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;margin-top:8px;}
 
+/* Form Grid（中后台表单统一布局：两列栅格 + 全宽行） */
+.form-grid{
+    display:grid;
+    grid-template-columns:repeat(2,minmax(0,1fr));
+    gap:12px;
+}
+
+.form-grid label{
+    display:flex;
+    flex-direction:column;
+    gap:6px;
+}
+
+.form-grid label > span{
+    font-size:12px;
+    font-weight:600;
+    color:var(--adm-text-secondary, #64748b);
+}
+
+.form-grid label > small{
+    margin-top:6px;
+}
+
+.form-grid .full{
+    grid-column:1 / -1;
+}
+
+@media (max-width: 768px){
+    .form-grid{grid-template-columns:1fr;}
+    .form-grid .full{grid-column:auto;}
+}
+
 table{
     width:100%;
     border-collapse:collapse;

resources/views/admin/platform_orders/form.blade.php

@@ -67,7 +67,6 @@
             @endif
         </div>
     @endif
-</div>
 
 <form method="post" action="/admin/platform-orders" class="card form-grid">
     @csrf