/* 基础重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            overflow-x: hidden;
        }
        
        /* 视频banner容器 */
        .video-banner {
            position: relative;
            width: 100%;
            height: 100vh;
            overflow: hidden;
        }
        
        /* 视频样式 */
        .banner-video {
            position: absolute;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: -2;
            opacity: 0.9; /* 视频透明度 */
        }
        
        /* 全局背景覆盖层 */
        .video-backdrop {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, 
                          rgba(0, 0, 0, 0.7) 0%, 
                          rgba(0, 0, 0, 0.4) 100%);
            z-index: -1;
        }
        
        /* 视频内容覆盖层 */
        .video-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 20px;
        }
        
        .video-content {
            color: white;
            max-width: 1310px;
            width: 100%;
        }
        
        .video-content h1 {
            font-size: clamp(2.5rem, 5vw, 3.5rem); /* 响应式字体 */
            margin-bottom: 25px;
            text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.8);
            font-weight: 700;
            letter-spacing: 1px;
            line-height: 1.2;
            color: rgba(255, 255, 255, 0.95);
        }
        
        .video-content p {
            font-size: clamp(1rem, 2vw, 1.3rem);
            margin-bottom: 50px;
            text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.7);

            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
            color: rgba(255, 255, 255, 0.9);
        }
        
        /* 产品分类按钮容器 */
        .product-categories {
            display: flex;
            justify-content: center;
            gap: 30px;
            flex-wrap: wrap;
            margin: 40px 0 60px;
        }
        
        /* 单个分类按钮样式 */
        .category-btn {
            position: relative;
            width: 280px;
            background-color: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            transition: all 0.4s ease;
            cursor: pointer;
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            padding: 20px;
        }
        
        .category-btn:hover {
            transform: translateY(-10px);
            background-color: rgba(255, 255, 255, 0.3);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
        }
        
        .category-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            width: 100%;
            height: 100%;
        }
        
        .category-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: #f0c14b;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .category-title {
            font-size: 1.4rem;
            font-weight: 600;
            margin-bottom: 15px;
            text-shadow: 0 1px 3px rgba(0,0,0,0.3);
        }
        
        .category-desc {
            font-size: 0.95rem;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            max-height: 72px;
            width: 100%;
            opacity: 0.9;
            padding: 0 10px;
        }
        
        /* 全部产品按钮 */
        .all-products-btn {
            padding: 15px 40px;
            background-color: rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(5px);
            color: white;
            border: 2px solid rgba(255, 255, 255, 0.4);
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            margin-top: 20px;
        }
        
        .all-products-btn:hover {
            background-color: rgba(255, 255, 255, 0.35);
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.3);
        }
        
        /* 响应式调整 */
        @media (max-width: 1200px) {
            .category-btn {
                width: 240px;
                height: 240px;
            }
        }
        
        @media (max-width: 992px) {
            .product-categories {
                gap: 20px;
            }
            
            .category-btn {
                width: 220px;
                height: 200px;
            }
            
            .category-desc {
                -webkit-line-clamp: 2;
                max-height: 48px;
            }
        }
        
        @media (max-width: 768px) {
            .video-content {
                margin-top: 0;
            }
            
            .product-categories {
                flex-direction: column;
                align-items: center;
                gap: 15px;
                margin: 30px 0 40px;
            }
            
            .category-btn {
                width: 100%;
                max-width: 400px;
                height: 100px;
                flex-direction: row;
                justify-content: flex-start;
                padding: 15px;
            }
            
            .category-content {
                align-items: flex-start;
                text-align: left;
                margin-left: 15px;
            }
            
            .category-icon {
                margin-bottom: 0;
                margin-right: 15px;
                font-size: 2rem;
            }
            
            .category-title {
                font-size: 1.2rem;
                margin-bottom: 5px;
            }
            
            .category-desc {
                -webkit-line-clamp: 1;
                max-height: 24px;
                text-align: left;
                padding: 0;
            }
            
            .all-products-btn {
                padding: 12px 30px;
                font-size: 1rem;
            }
        }
        
        @media (max-width: 480px) {
            .video-content h1 {
                margin-bottom: 20px;
            }
            
            .video-content p {
                margin-bottom: 30px;
            }
            
            .category-btn {
                flex-direction: column;
                height: auto;
                min-height: 140px;
                text-align: center;
                padding: 20px;
            }
            
            .category-content {
                align-items: center;
                text-align: center;
                margin-left: 0;
            }
            
            .category-icon {
                margin-right: 0;
                margin-bottom: 15px;
            }
            
            .category-desc {
                -webkit-line-clamp: 2;
                max-height: 48px;
                text-align: center;
            }
        }