:root {
            --primary-color: #0056b3;
            --secondary-color: #f8f9fa;
            --accent-color: #ffc107;
            --text-dark: #333;
            --text-light: #555;
        }
        body {
            font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
            color: var(--text-dark);
            line-height: 1.8;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), #003d82);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: url('https://images.unsplash.com/photo-1518709268805-4e9042af2176?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 120px 0;
            position: relative;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .section-title {
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 30px;
            font-weight: 700;
        }
        .card {
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        .btn-primary:hover {
            background-color: #004494;
        }
        .flink {
            display: inline-block;
            margin: 10px 15px;
            padding: 10px 20px;
            background: var(--secondary-color);
            border-radius: 8px;
            color: var(--text-dark);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #ddd;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .friendlink {
            background: #f9f9f9;
            padding: 40px 0;
        }
        footer {
            background: #222;
            color: #ccc;
        }
        .contact-info i {
            width: 30px;
            color: var(--accent-color);
        }
        .hover-effect {
            transition: opacity 0.3s;
        }
        .hover-effect:hover {
            opacity: 0.9;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .navbar-nav {
                text-align: center;
            }
        }