:root {
            --primary-color: #0056b3;
            --secondary-color: #f8f9fa;
            --accent-color: #ffc107;
        }
        body {
            font-family: 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.5rem;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.8), rgba(0, 86, 179, 0.9)), url('https://images.unsplash.com/photo-1556761175-b413da4baf72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 2rem;
            padding-bottom: 10px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--primary-color);
        }
        .card {
            transition: transform 0.3s, box-shadow 0.3s;
            border: none;
            border-radius: 10px;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 10px 25px;
            border-radius: 5px;
            transition: background 0.3s;
        }
        .btn-primary:hover {
            background-color: #004494;
        }
        .friendlink .flink {
            display: inline-block;
            margin: 5px 10px;
            padding: 8px 15px;
            background: var(--secondary-color);
            border-radius: 5px;
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .friendlink .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background: #222;
            color: #ddd;
        }
        .social-icons a {
            color: #ddd;
            margin: 0 10px;
            font-size: 1.2rem;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: var(--accent-color);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }