:root {
            --primary-color: #0a3d62;
            --secondary-color: #079992;
            --accent-color: #f6b93b;
            --light-color: #f8f9fa;
            --dark-color: #2c3e50;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color);
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(10, 61, 98, 0.85), rgba(7, 153, 146, 0.8)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3.5rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .card-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .product-card {
            border: 1px solid #eee;
        }
        .product-card img {
            height: 220px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .flink {
            display: inline-block;
            background-color: var(--light-color);
            color: var(--dark-color);
            padding: 8px 20px;
            margin: 5px;
            border-radius: 5px;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #ddd;
        }
        .flink:hover {
            background-color: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 80px 0 30px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
        }
        .copyright {
            background-color: rgba(0, 0, 0, 0.2);
            padding: 20px 0;
            margin-top: 50px;
            font-size: 0.9rem;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background-color: var(--secondary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: var(--secondary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        .timeline-date {
            font-weight: 600;
            color: var(--secondary-color);
        }
        .contact-info {
            background-color: var(--light-color);
            padding: 30px;
            border-radius: 10px;
            height: 100%;
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stats-label {
            font-size: 1.1rem;
            color: var(--dark-color);
            font-weight: 600;
        }
        .news-card {
            height: 100%;
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: var(--secondary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 5px;
            font-weight: 600;
        }
        .news-card img {
            height: 220px;
            object-fit: cover;
        }
        .about-img {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 999;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .stats-number {
                font-size: 2.5rem;
            }
        }