:root {
            --primary-color: #1a3a8f;
            --secondary-color: #00a8ff;
            --accent-color: #ff6b35;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--dark-text);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            color: var(--dark-text) !important;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 58, 143, 0.85), rgba(0, 168, 255, 0.8)), url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
        }
        .section-title {
            color: var(--primary-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
            margin-bottom: 2rem;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            transition: background-color 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        .contact-form input, .contact-form textarea {
            border-radius: 10px;
            border: 1px solid #ccc;
            padding: 12px;
        }
        .footer {
            background-color: #2c3e50;
            color: white;
            padding: 3rem 0;
        }
        .flink {
            color: #00a8ff;
            text-decoration: none;
            transition: color 0.3s;
        }
        .flink:hover {
            color: white;
            text-decoration: underline;
        }
        .friendlink-section {
            background-color: #34495e;
            padding: 2rem;
            border-radius: 10px;
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }