.menu {
            list-style: none;
            margin-top: 20px;
        }
        
        .menu-item {
            margin-bottom: 8px;
        }
        
        .menu-item-header {
            padding: 12px 15px;
            background: #f5f7fa;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            color: #4a5568;
            font-size: 1.1rem;
            font-weight: 500;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: relative;
        }
        
        .menu-item-header:hover {
            background: #e6f2ff;
        }
        
        .menu-item-header.active {
            background: #1a6bc4;
            color: white;
        }
        
        /* 箭头样式 */
        .menu-arrow {
            width: 20px;
            height: 20px;
            position: relative;
            transition: transform 0.3s ease;
        }
        
        .menu-arrow::before {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            width: 8px;
            height: 8px;
            border-right: 2px solid currentColor;
            border-bottom: 2px solid currentColor;
            transform: translate(-50%, -50%) rotate(45deg);
            transition: transform 0.3s ease;
        }
        
        .menu-item-header.active .menu-arrow::before {
            transform: translate(-50%, -50%) rotate(225deg);
        }
        
        /* 二级菜单样式 */
        .submenu {
            list-style: none;
            margin-left: 20px;
            margin-top: 8px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .submenu.active {
            max-height: 590px;
        }
        
        .submenu-item {
            padding: 10px 15px;
            margin-bottom: 5px;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s ease;
            color: #4a5568;
            font-size: 1rem;
            background: rgba(230, 242, 255, 0.5);
        }
        
        .submenu-item:hover {
            background: #1a6bc4;
            color: white;
        }
        
        .submenu-item.active {
            background: #0d4a8c;
            color: white;
        }
        
        /* 内容区域样式 */
        .content-section {
            margin-top: 30px;
            padding: 20px;
            background: #f5f7fa;
            border-radius: 8px;
            display: none;
        }
        
        .content-section.active {
            display: block;
            /* animation: fadeIn 0.5s ease; */
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .content-section h3 {
            color: #0d4a8c;
            margin-bottom: 15px;
        }
        
        .content-section p {
            margin-bottom: 10px;
        }
        
        .code-example {
            background: #2d3748;
            color: #e2e8f0;
            padding: 15px;
            border-radius: 6px;
            margin-top: 20px;
            font-family: monospace;
            font-size: 0.9rem;
            overflow-x: auto;
        }