/* 页面标题 */
        .page-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 30px 0;
            flex-wrap: wrap;
            gap: 20px;
        }

        .page-title {
            font-size: 32px;
            color: #2d3436;
            position: relative;
        }

        .page-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #6a11cb, #2575fc);
            border-radius: 2px;
        }

        /* 控制栏 */
        .controls {
            display: flex;
            background: white;
            border-radius: 12px;
            padding: 15px 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .search-box {
            flex: 1;
            min-width: 250px;
            position: relative;
        }

        .search-box input {
            width: 100%;
            padding: 12px 20px 12px 45px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
        }

        .search-box input:focus {
            outline: none;
            border-color: #6a11cb;
            box-shadow: 0 0 0 3px rgba(106, 17, 203, 0.1);
        }

        .search-box i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #636e72;
        }

        .filter-btn {
            background: white;
            border: 1px solid #ddd;
            padding: 10px 20px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
        }

        .filter-btn:hover {
            border-color: #6a11cb;
            color: #6a11cb;
        }

        .filter-btn i {
            margin-right: 8px;
        }

        .sort-select {
            padding: 10px 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background: white;
            font-size: 16px;
            cursor: pointer;
        }

        .sort-select:focus {
            outline: none;
            border-color: #6a11cb;
        }

        /* 品牌分类 */
        .brand-categories {
            margin-bottom: 30px;
        }

        .category-section {
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin-bottom: 20px;
            overflow: hidden;
        }

        .category-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .category-header:hover {
            background-color: #f8f9fa;
        }

        .category-title {
            display: flex;
            align-items: center;
            font-size: 20px;
            font-weight: 600;
            color: #2d3436;
        }

        .category-title i {
            margin-right: 10px;
            color: #6a11cb;
            font-size: 24px;
        }

        .toggle-icon {
            font-size: 20px;
            transition: transform 0.3s;
        }

        .category-content {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            gap: 20px;
            padding: 0 20px 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease-out, padding 0.5s ease-out;
        }

        .category-content.active {
            max-height: 1000px;
            padding: 0 20px 20px;
            overflow: overlay;
        }

        /* 品牌卡片 */
        .brand-card {
            background: #f8f9fa;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px 15px;
            position: relative;
        }

        .brand-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            background: white;
        }

        .brand-logo {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: white;
            margin-bottom: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            overflow: hidden;
        }

        .brand-logo img {
            max-width: 70%;
            max-height: 70%;
            object-fit: contain;
        }

        .brand-name {
            font-weight: 600;
            font-size: 16px;
            text-align: center;
            color: #2d3436;
            margin-bottom: 10px;
        }

        .brand-products {
            font-size: 14px;
            color: #636e72;
        }

        .brand-info-list {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(106, 17, 203, 0.9);
            color: white;
            padding: 20px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.3s;
            border-radius: 10px;
            text-align: center;
        }

        .brand-card:hover .brand-info-list {
            opacity: 1;
        }

        .brand-desc {
            font-size: 14px;
            margin: 10px 0;
            line-height: 1.4;
        }

        .view-btn {
            margin-top: 10px;
            padding: 6px 15px;
            background: white;
            color: #6a11cb;
            border: none;
            border-radius: 20px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }

        .view-btn:hover {
            background: #f8f9fa;
            transform: translateY(-2px);
        }

        /* 字母索引 */
        .alpha-index {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 5px;
            margin-bottom: 30px;
        }

        .alpha-letter {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: white;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
        }

        .alpha-letter:hover,
        .alpha-letter.active {
            background: #6a11cb;
            color: white;
        }



        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

            .header-content {
                justify-content: center;
            }

            .category-header {
                padding: 15px;
            }

            .category-content {
                grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            }

            .controls {
                flex-direction: column;
            }

            .search-box {
                min-width: 100%;
            }
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .brand-card {
            animation: fadeIn 0.5s ease-out;
        }