:root {
            --primary-blue: #0d3b66;
            --accent-gold: #d4af37;
            --neutral-light: #f8f9fa;
            --neutral-dark: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--neutral-dark);
            overflow-x: hidden;
        }
        .gradient-bg {
            background: linear-gradient(135deg, #0d3b66 0%, #1c5a8c 100%);
        }
        .section-header {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
        }
        .section-header::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-gold);
        }
        .nav-link {
            position: relative;
            font-weight: 500;
            transition: var(--transition);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--accent-gold);
            transition: var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            left: 0;
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 59, 102, 0.85), rgba(13, 59, 102, 0.9)), url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px;
            background: var(--neutral-light);
            border: 1px solid #dee2e6;
            border-radius: 4px;
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(13, 59, 102, 0.1);
        }
        .service-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(13, 59, 102, 0.1);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(45deg, var(--primary-blue), #1c5a8c);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -35px auto 20px;
            color: white;
            font-size: 28px;
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .contact-info i {
            width: 40px;
            color: var(--accent-gold);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1;
        }
        .map-container {
            height: 400px;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        footer a {
            text-decoration: none;
            color: #adb5bd;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--accent-gold);
            color: var(--primary-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--primary-blue);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                min-height: 70vh;
                text-align: center;
            }
            .section-header::after {
                width: 60px;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .map-container {
                height: 300px;
            }
        }
        .certificate-img {
            max-height: 120px;
            object-fit: contain;
            padding: 15px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
        }