body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        header {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            padding: 2rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: white !important;
        }
        .nav-link {
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: #ffcc00 !important;
        }
        .hero-section {
            padding: 5rem 0;
            text-align: center;
            background: url('https://images.unsplash.com/photo-1511379938547-c1f69419868d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            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: 1;
        }
        section {
            padding: 4rem 0;
        }
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 2rem;
            color: #2575fc;
            text-align: center;
            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 12px 20px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 250px;
            object-fit: cover;
        }
        .btn-primary {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            border: none;
            border-radius: 50px;
            padding: 0.8rem 2rem;
            font-weight: bold;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, #2575fc 0%, #6a11cb 100%);
            transform: scale(1.05);
        }
        .friendlink a.flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.5rem 1.5rem;
            background: #f1f1f1;
            border-radius: 30px;
            color: #333;
            text-decoration: none;
            transition: all 0.3s;
        }
        .friendlink a.flink:hover {
            background: #2575fc;
            color: white;
        }
        footer {
            background: #2c3e50;
            color: white;
            padding: 3rem 0 1rem;
        }
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin: 0 0.5rem;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: #ffcc00;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 2rem;
            }
            .hero-section {
                padding: 3rem 0;
            }
        }