:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --accent-color: #ff6b35;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 180, 0.85), rgba(23, 162, 184, 0.9)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1772&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .service-card {
            border-top: 5px solid var(--primary-color);
        }
        .product-card {
            border-top: 5px solid var(--secondary-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: scale(1.05);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
            border-radius: 50px;
            padding: 10px 25px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: scale(1.05);
        }
        .contact-info {
            background: var(--light-color);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-right: 15px;
        }
        footer {
            background: var(--dark-color);
            color: var(--light-color);
            padding: 60px 0 20px;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 8px;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .friendlink-section {
            background: #f1f5f9;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 15px 25px;
            margin: 10px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            color: var(--primary-color);
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .testimonial-card {
            border-left: 5px solid var(--secondary-color);
            padding-left: 25px;
        }
        .news-card {
            border-bottom: 3px solid #eee;
            padding-bottom: 25px;
            margin-bottom: 30px;
        }
        .news-date {
            color: var(--secondary-color);
            font-weight: 600;
        }
        .map-container {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            margin: 0 8px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.3);
            z-index: 1000;
            opacity: 0;
            transition: var(--transition);
        }
        .back-to-top.show {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
                min-height: 80vh;
            }
            .section-title::after {
                width: 60px;
            }
            .stat-number {
                font-size: 2.8rem;
            }
        }