:root {
            --primary-color: #0056b3;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --dark-color: #1d3557;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 40, 83, 0.85), rgba(0, 40, 83, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 120px 0 100px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 4px;
            background: var(--primary-color);
        }
        .text-center .section-title:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .nav-link {
            font-weight: 500;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 4px;
            font-weight: 500;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 86, 179, 0.2);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            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);
        }
        .service-icon, .feature-icon {
            width: 70px;
            height: 70px;
            background: rgba(0, 86, 179, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary-color);
            font-size: 28px;
        }
        .process-step {
            position: relative;
            padding: 30px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
        }
        .step-number {
            position: absolute;
            top: -20px;
            left: 30px;
            width: 40px;
            height: 40px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .contact-info-box {
            padding: 30px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
            text-align: center;
            transition: transform 0.3s;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 40px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .friendlink {
            background: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 30px;
            color: var(--dark-color);
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        footer {
            background: var(--dark-color);
            color: rgba(255, 255, 255, 0.8);
        }
        footer a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .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;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: #004494;
            transform: translateY(-5px);
        }
        .img-hover-zoom {
            overflow: hidden;
            border-radius: 8px;
        }
        .img-hover-zoom img {
            transition: transform 0.5s;
        }
        .img-hover-zoom:hover img {
            transform: scale(1.05);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0 60px;
            }
            .display-4 {
                font-size: 2rem;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }