导航菜单

css/nav-mega-menu.css

@@ -11,7 +11,8 @@
   box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
   border-top: 1px solid rgba(56, 189, 248, 0.15);
   z-index: 1000;
-  overflow: hidden;
+  overflow-x: hidden;
+  overflow-y: hidden;
   transition: height 0.3s ease-out;
   height: 0;
 }
@@ -90,6 +91,7 @@
   flex: 1;
   padding: 16px 24px;
   background: rgba(15, 23, 42, 0.6);
+  overflow-x: hidden;
   overflow-y: auto;
   max-height: none;
   height: 100%;
@@ -187,8 +189,74 @@
   font-size: 14px;
 }
 
-/* 旧版二级菜单样式（无三级菜单时使用） */
+/* 只有二级菜单时的横向网格布局 */
+.nav-simple-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+  gap: 16px;
+  padding: 24px 32px;
+  max-width: 1400px;
+  margin: 0 auto;
+}
+
+.nav-simple-item {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 16px;
+  background: rgba(30, 41, 59, 0.6);
+  border: 1px solid rgba(56, 189, 248, 0.15);
+  border-radius: 6px;
+  color: #E5E7EB;
+  text-decoration: none;
+  transition: all 0.2s ease;
+}
+
+.nav-simple-item:hover {
+  background: rgba(56, 189, 248, 0.15);
+  border-color: #38BDF8;
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
+}
+
+.nav-simple-icon {
+  width: 32px;
+  height: 32px;
+  flex-shrink: 0;
+}
+
+.nav-simple-icon img {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+}
+
+.nav-simple-info {
+  flex: 1;
+  min-width: 0;
+}
+
+.nav-simple-title {
+  font-size: 14px;
+  font-weight: 600;
+  color: #E5E7EB;
+  margin-bottom: 4px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.nav-simple-desc {
+  font-size: 12px;
+  color: #94A3B8;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+/* 旧版二级菜单样式（无三级菜单时使用） - 已废弃，保留兼容 */
 .nav-item-box {
+
   display: flex;
   align-items: center;
   gap: 12px;