:root {
            --primary-color: #0a4a7a;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --light-color: #f8f9fa;
            --dark-color: #212529;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: #333;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .navbar-brand span {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(10, 74, 122, 0.85), rgba(10, 74, 122, 0.9)), url('https://images.unsplash.com/photo-1621905252507-b35492cc74b4?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            margin-top: 76px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.1);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
        }
        .product-card {
            height: 100%;
            border-radius: 8px;
            overflow: hidden;
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background: #f8f9fa;
            border-radius: 4px;
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background: var(--dark-color);
            color: #adb5bd;
        }
        .footer a {
            color: #adb5bd;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .contact-info li {
            margin-bottom: 10px;
            padding-left: 30px;
            position: relative;
        }
        .contact-info i {
            position: absolute;
            left: 0;
            top: 5px;
            color: var(--accent-color);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            border-left: 2px solid var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            background: var(--secondary-color);
            border-radius: 50%;
            left: -39px;
            top: 5px;
        }
        .certification-badge {
            display: inline-block;
            background: #e9f7fe;
            color: var(--primary-color);
            padding: 5px 15px;
            border-radius: 20px;
            margin: 5px;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
                margin-top: 56px;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            transition: opacity 0.3s, transform 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            background: var(--secondary-color);
        }