:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --hover-color: #003d82;
        }
        body {
            font-family: 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 179, 0.8), rgba(0, 84, 179, 0.9)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
        }
        .card {
            border: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.15);
        }
        .service-icon, .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 30px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--hover-color);
            border-color: var(--hover-color);
            transform: scale(1.05);
        }
        .team-img {
            width: 150px;
            height: 150px;
            object-fit: cover;
            border-radius: 50%;
            border: 5px solid var(--light-color);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 60px 0 20px;
        }
        .friendlink-section {
            background-color: #e9ecef;
            padding: 40px 0;
        }
        .flink {
            display: inline-block;
            margin: 10px 15px;
            padding: 8px 20px;
            background: white;
            border-radius: 20px;
            color: var(--dark-color);
            text-decoration: none;
            box-shadow: 0 3px 6px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .contact-info li {
            margin-bottom: 15px;
            font-size: 1.1rem;
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 10px;
            width: 25px;
        }
        .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;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            z-index: 1000;
            transition: all 0.3s ease;
        }
        .back-to-top:hover {
            background: var(--hover-color);
            transform: scale(1.1);
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 6px 12px rgba(0,0,0,0.1);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .team-img {
                width: 120px;
                height: 120px;
            }
        }