:root {
            --primary-color: #2c3e50;
            --secondary-color: #18bc9c;
            --accent-color: #f39c12;
            --light-color: #ecf0f1;
            --dark-color: #34495e;
        }
        body {
            font-family: 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
            color: white;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
        }
        .nav-link {
            color: white !important;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero {
            background: url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            min-height: 90vh;
            display: flex;
            align-items: center;
            color: white;
            text-shadow: 2px 2px 10px rgba(0,0,0,0.7);
            position: relative;
        }
        .hero-overlay {
            background: rgba(0, 0, 0, 0.5);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 15px;
            margin-bottom: 40px;
            font-weight: bold;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-img-top {
            height: 250px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: bold;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #148f77;
            border-color: #148f77;
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 10px;
            background: var(--light-color);
            border-radius: 10px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-5px);
        }
        .friendlink {
            background: #f8f9fa;
            padding: 50px 0;
        }
        footer {
            background: var(--primary-color);
            color: white;
            padding: 40px 0 20px;
        }
        .footer-link {
            color: var(--light-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: var(--accent-color);
        }
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin: 0 10px;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: var(--accent-color);
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }