:root {
            --primary-blue: #0a3d62;
            --secondary-blue: #1e5799;
            --accent-teal: #2bcbba;
            --accent-gold: #f9ca24;
            --light-gray: #f8f9fa;
            --dark-gray: #333;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-blue);
        }
        .hero-section {
            background: linear-gradient(rgba(10, 61, 98, 0.85), rgba(30, 87, 153, 0.9)), url('https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 160px 0 100px;
            position: relative;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            padding: 15px 0;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-blue) !important;
        }
        .navbar-brand span {
            color: var(--accent-teal);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-gray) !important;
            margin: 0 8px;
            position: relative;
        }
        .nav-link:hover {
            color: var(--secondary-blue) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            background: var(--accent-teal);
            bottom: 0;
            left: 0;
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-blue), var(--secondary-blue));
            color: white;
            border: none;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(30, 87, 153, 0.2);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(30, 87, 153, 0.3);
            color: white;
        }
        .section-title {
            position: relative;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--accent-teal);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.4s ease;
            height: 100%;
            border-top: 4px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            border-top-color: var(--accent-teal);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--accent-teal);
            margin-bottom: 20px;
        }
        .product-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .product-img {
            height: 220px;
            width: 100%;
            object-fit: cover;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--accent-teal);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px 30px;
            background-color: white;
            position: relative;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .timeline-item:nth-child(odd)::before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            border: 4px solid var(--accent-teal);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        .timeline-item:nth-child(even)::before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            background-color: white;
            border: 4px solid var(--accent-teal);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        .footer {
            background-color: var(--primary-blue);
            color: white;
            padding-top: 60px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer h5::after {
            content: '';
            position: absolute;
            width: 50px;
            height: 3px;
            background: var(--accent-teal);
            bottom: 0;
            left: 0;
        }
        .footer-link {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: all 0.3s ease;
        }
        .footer-link:hover {
            color: var(--accent-teal);
            padding-left: 8px;
        }
        .friendlink {
            background-color: var(--light-gray);
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 8px;
            text-decoration: none;
            color: var(--dark-gray);
            font-weight: 600;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            border-left: 4px solid var(--accent-teal);
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
            color: var(--secondary-blue);
        }
        .contact-info {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: var(--accent-teal);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:nth-child(odd)::before,
            .timeline-item:nth-child(even)::before {
                left: 21px;
                right: auto;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(30, 87, 153, 0.3);
        }
        .scroll-top.active {
            opacity: 1;
            visibility: visible;
        }
        .scroll-top:hover {
            background: var(--primary-blue);
            transform: translateY(-5px);
        }
        .certificate-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--accent-gold);
            color: var(--dark-gray);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
        }