重新设计为阿里云风格

css/nav-mega-menu.css

@@ -1,4 +1,259 @@
-/* 三级导航菜单样式 - Mega Menu风格 */
+/* 三级导航菜单样式 - 阿里云风格两栏布局 */
+
+/* 导航容器 */
+.nav-cont {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  width: 100%;
+  background: #fff;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
+  z-index: 1000;
+  overflow: hidden;
+  transition: height 0.3s ease-out;
+}
+
+/* Mega Menu 两栏布局 */
+.nav-cont-menu.mega-menu {
+  display: none;
+  min-height: 400px;
+}
+
+.nav-content {
+  display: flex;
+  max-width: 1400px;
+  margin: 0 auto;
+  min-height: 400px;
+}
+
+/* 左侧二级菜单栏 */
+.nav-left-sidebar {
+  width: 200px;
+  background: #f7f8fa;
+  border-right: 1px solid #e8e8e8;
+  flex-shrink: 0;
+}
+
+/* 二级菜单项 */
+.nav-category-item {
+  position: relative;
+  display: block;
+  padding: 16px 20px;
+  color: #333;
+  font-size: 14px;
+  text-decoration: none;
+  border-left: 3px solid transparent;
+  transition: all 0.2s ease;
+  cursor: pointer;
+}
+
+.nav-category-item:hover,
+.nav-category-item.active {
+  background: #fff;
+  border-left-color: #1890ff;
+  color: #1890ff;
+}
+
+.nav-category-item .category-icon {
+  display: inline-block;
+  width: 20px;
+  height: 20px;
+  margin-right: 8px;
+  vertical-align: middle;
+}
+
+.nav-category-item .category-icon img {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+}
+
+.nav-category-name {
+  font-weight: 500;
+}
+
+.nav-category-desc {
+  font-size: 12px;
+  color: #999;
+  margin-top: 2px;
+  display: block;
+}
+
+/* 右侧三级菜单区域 */
+.nav-right-content {
+  flex: 1;
+  padding: 24px 32px;
+  background: #fff;
+  overflow-y: auto;
+  max-height: 500px;
+}
+
+/* 三级菜单容器 */
+.nav-third-panel {
+  display: none;
+}
+
+.nav-third-panel.active {
+  display: block;
+  animation: fadeInRight 0.3s ease;
+}
+
+/* 三级菜单标题 */
+.nav-third-title {
+  font-size: 16px;
+  font-weight: 600;
+  color: #333;
+  margin-bottom: 16px;
+  padding-bottom: 12px;
+  border-bottom: 2px solid #1890ff;
+  display: inline-block;
+}
+
+/* 三级菜单网格布局 */
+.nav-third-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
+  gap: 12px 20px;
+  margin-top: 20px;
+}
+
+/* 三级菜单项 */
+.nav-third-item {
+  margin: 0;
+}
+
+.nav-third-link {
+  display: flex;
+  align-items: center;
+  padding: 10px 12px;
+  border-radius: 4px;
+  color: #333;
+  font-size: 13px;
+  text-decoration: none;
+  transition: all 0.2s ease;
+  border: 1px solid transparent;
+}
+
+.nav-third-link:hover {
+  background: #f0f7ff;
+  border-color: #91d5ff;
+  color: #1890ff;
+  transform: translateX(4px);
+}
+
+.nav-third-link::before {
+  content: '›';
+  font-size: 16px;
+  color: #1890ff;
+  margin-right: 6px;
+  transition: transform 0.2s ease;
+}
+
+.nav-third-link:hover::before {
+  transform: translateX(2px);
+}
+
+.nav-third-name {
+  flex: 1;
+  font-weight: 500;
+}
+
+.nav-third-desc {
+  font-size: 11px;
+  color: #999;
+  margin-left: 8px;
+}
+
+/* 空状态 */
+.nav-right-empty {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 300px;
+  color: #999;
+  font-size: 14px;
+}
+
+/* 旧版二级菜单样式（无三级菜单时使用） */
+.nav-item-box {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 16px 20px;
+  transition: all 0.2s ease;
+  text-decoration: none;
+  color: #333;
+  border-left: 3px solid transparent;
+}
+
+.nav-item-box:hover {
+  background: #fff;
+  border-left-color: #1890ff;
+  color: #1890ff;
+}
+
+.nav-item-box img {
+  width: 20px;
+  height: 20px;
+  flex-shrink: 0;
+}
+
+.item-box-title .title {
+  font-size: 14px;
+  font-weight: 500;
+  margin-bottom: 2px;
+}
+
+.item-box-title .desc {
+  font-size: 12px;
+  color: #999;
+}
+
+/* 空菜单占位 */
+.nav-cont-menu.nav-cont-empty {
+  display: none;
+}
+
+/* 动画效果 */
+@keyframes fadeInRight {
+  from {
+    opacity: 0;
+    transform: translateX(10px);
+  }
+
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+/* 响应式调整 */
+@media (max-width: 768px) {
+  .nav-cont {
+    display: none !important;
+  }
+
+  .nav-content {
+    flex-direction: column;
+    min-height: auto;
+  }
+
+  .nav-left-sidebar {
+    width: 100%;
+    border-right: none;
+    border-bottom: 1px solid #e8e8e8;
+  }
+
+  .nav-right-content {
+    padding: 16px;
+    max-height: none;
+  }
+
+  .nav-third-grid {
+    grid-template-columns: 1fr;
+  }
+}
+
 
 /* 导航容器 */
 .nav-cont {
@@ -190,16 +445,16 @@
   .nav-cont {
     display: none !important;
   }
-  
+
   .nav-cont-menu.mega-menu {
     padding: 16px 0;
   }
-  
+
   .nav-cont-menu.mega-menu .nav-content {
     flex-direction: column;
     gap: 16px;
   }
-  
+
   .nav-category {
     max-width: 100%;
   }
@@ -211,6 +466,7 @@
     opacity: 0;
     transform: translateY(-10px);
   }
+
   to {
     opacity: 1;
     transform: translateY(0);
@@ -219,4 +475,4 @@
 
 .nav-cont-menu.animated {
   animation: fadeInDown 0.3s ease-out;
-}
+}