:root {
            --primary-color: #1a5fb4;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --dark-color: #1d3557;
            --light-color: #f1faee;
            --gray-color: #8d99ae;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: #333;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 180, 0.85), rgba(29, 53, 87, 0.9)), url('https://images.unsplash.com/photo-1546519638-68e109498ffc?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0 100px;
            position: relative;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            color: var(--primary-color) !important;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 8px;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 28px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--dark-color);
            border-color: var(--dark-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            padding-bottom: 20px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: all 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 95, 180, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .icon-box i {
            font-size: 28px;
            color: var(--primary-color);
        }
        .product-card {
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 30px;
            transition: all 0.3s;
        }
        .product-card:hover {
            transform: translateY(-8px);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding-top: 80px;
        }
        .footer a {
            color: #ddd;
            transition: color 0.3s;
            text-decoration: none;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 2px;
            background-color: var(--primary-color);
        }
        .flink {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 8px 20px;
            margin: 5px 10px 5px 0;
            border-radius: 4px;
            color: #ddd;
            transition: all 0.3s;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .flink:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--dark-color);
            color: white;
            transform: translateY(-5px);
        }
        .contact-info-box {
            background-color: #f8f9fa;
            padding: 30px;
            border-radius: 10px;
            border-left: 5px solid var(--primary-color);
            margin-bottom: 30px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0 80px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .navbar {
                padding: 10px 0;
            }
        }