:root {
            --primary-color: #0d47a1;
            --secondary-color: #ff6f00;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(13, 71, 161, 0.8), rgba(13, 71, 161, 0.9)), url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 10px;
            margin-bottom: 30px;
            display: inline-block;
        }
        .card {
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        .footer {
            background-color: #1a237e;
            color: white;
            padding: 50px 0 20px;
        }
        .friendlink .flink {
            display: inline-block;
            margin: 5px 10px;
            color: var(--primary-color);
            text-decoration: none;
            padding: 8px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            transition: var(--transition);
        }
        .friendlink .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .img-hover {
            overflow: hidden;
        }
        .img-hover img {
            transition: var(--transition);
        }
        .img-hover img:hover {
            transform: scale(1.05);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }