:root {
            --primary-color: #0056b3;
            --secondary-color: #1e88e5;
            --accent-color: #00acc1;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --success-color: #28a745;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 0.5rem;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(30, 136, 229, 0.9)), url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        .hero-section p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .card {
            border: none;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            border-radius: 12px;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .service-item {
            padding: 2.5rem 1.5rem;
            text-align: center;
            border-radius: 12px;
            transition: all 0.3s;
            height: 100%;
            background: white;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        .service-item:hover {
            background: linear-gradient(135deg, #f8f9fa, #e9f7fe);
        }
        .stats-section {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.95)), url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 5rem 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: white;
            margin-bottom: 0.5rem;
        }
        .flink {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background: #f8f9fa;
            border-radius: 8px;
            margin: 0.5rem;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.2);
            text-decoration: none;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 4rem 0;
        }
        footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.85);
            padding: 4rem 0 2rem;
        }
        footer a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-title {
            color: white;
            font-weight: 700;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .contact-info li {
            margin-bottom: 1rem;
            display: flex;
            align-items: flex-start;
        }
        .contact-info i {
            color: var(--accent-color);
            margin-right: 1rem;
            margin-top: 0.3rem;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 2rem;
            margin-top: 3rem;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }
        .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: 1.5rem;
            text-decoration: none;
            z-index: 999;
            opacity: 0;
            transition: all 0.3s;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: white;
            transform: translateY(-5px);
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
            margin-left: 1rem;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 4px;
            height: 100%;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.4rem;
            top: 0.5rem;
            width: 16px;
            height: 16px;
            background: white;
            border: 3px solid var(--primary-color);
            border-radius: 50%;
        }
        .product-img {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: transform 0.5s;
        }
        .product-img:hover {
            transform: scale(1.03);
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding-bottom: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .news-item:last-child {
            border-bottom: none;
        }
        .news-date {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .navbar-nav {
                background: white;
                padding: 1rem;
                border-radius: 8px;
                margin-top: 1rem;
                box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            }
        }