* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f8fafc 0%, #edf2f7 100%);
            color: #333;
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(90deg, #1a3a6c 0%, #2c5282 100%);
            color: white;
            padding: 15px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo-placeholder {
            width: 50px;
            height: 50px;
            background: linear-gradient(45deg, #4c7dc0, #63b3ed);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: white;
            font-size: 24px;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 30px;
        }
        
        nav ul li a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            font-weight: 500;
            font-size: 17px;
            transition: all 0.3s ease;
            padding: 8px 5px;
            position: relative;
        }
        
        nav ul li a:hover {
            color: white;
        }
        
        nav ul li a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            bottom: 0;
            left: 0;
            background-color: #63b3ed;
            transition: width 0.3s ease;
        }
        
        nav ul li a:hover::after {
            width: 100%;
        }
        
        /* 主体内容样式 */
        main {
            padding: 40px 0;
            flex: 1;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        
        .section-title h1 {
            font-size: 36px;
            color: #2c5282;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h1::after {
            content: '';
            position: absolute;
            width: 70%;
            height: 4px;
            background: linear-gradient(90deg, #63b3ed, #4299e1);
            bottom: -10px;
            left: 15%;
            border-radius: 2px;
        }
        
        .section-title p {
            color: #4a5568;
            font-size: 18px;
            max-width: 700px;
            margin: 20px auto 0;
            line-height: 1.7;
        }
        
        /* 产品卡片样式 - 一行一个 */
        .products-container {
            display: flex;
            flex-direction: column;
            gap: 50px;
            margin-top: 30px;
        }
        
        .product-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
        }
        
        .product-title {
            padding: 25px 30px;
            background: linear-gradient(90deg, #f7fafc, #ebf4ff);
            border-bottom: 1px solid #e2e8f0;
        }
        
        .product-title h2 {
            font-size: 28px;
            color: #2c5282;
            display: flex;
            align-items: center;
        }
        
        .product-title h2 i {
            margin-right: 15px;
            color: #4299e1;
            background: rgba(66, 153, 225, 0.1);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .product-image {
            width: 100%;
            height: auto;
            display: flex;
            justify-content: center;
            background: #f8fafc;
            padding: 30px;
        }
        
        .product-image img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            border: 1px solid #e2e8f0;
        }
        
        .img-placeholder {
            /*width: 1280px;
            height: 673px;
            background: linear-gradient(45deg, #a0c6f8, #c3dafe);*/
            display: flex;
            align-items: center;
            justify-content: center;
            color: #2c5282;
            font-size: 24px;
            font-weight: bold;
            border-radius: 8px;
        }
        
        /* 底部样式 */
        footer {
            background: linear-gradient(90deg, #1a3a6c 0%, #2c5282 100%);
            color: rgba(255, 255, 255, 0.85);
            padding: 30px 0 20px;
            text-align: center;
        }
        
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .footer-links {
            margin-bottom: 25px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            margin: 0 15px;
            font-size: 16px;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .beian-info {
            background: rgba(0, 0, 0, 0.15);
            padding: 15px 30px;
            border-radius: 8px;
            margin-top: 10px;
            display: inline-block;
            font-size: 16px;
        }
        
        .copyright {
            margin-top: 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 1350px) {
            .img-placeholder {
                width: 100%;
                height: auto;
                aspect-ratio: 1280/673;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
            }
            
            nav ul {
                margin-top: 20px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav ul li {
                margin: 5px 10px;
            }
            
            .section-title h1 {
                font-size: 28px;
            }
            
            .section-title p {
                font-size: 16px;
            }
            
            .product-title {
                padding: 20px;
            }
            
            .product-title h2 {
                font-size: 22px;
            }
            
            .product-image {
                padding: 15px;
            }
        }
        
        @media (max-width: 480px) {
            .logo-text {
                font-size: 20px;
            }
            
            .footer-links {
                display: flex;
                flex-direction: column;
            }
            
            .footer-links a {
                margin: 5px 0;
            }
            
            .beian-info {
                padding: 10px 15px;
                font-size: 14px;
            }
        }