:root {
            --primary-color: #1a56db;
            --secondary-color: #059669;
            --dark-color: #111827;
            --light-color: #f9fafb;
            --gray-color: #6b7280;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 86, 219, 0.85), rgba(5, 150, 105, 0.9)), url('https://images.unsplash.com/photo-1553778263-73a83bab9b0c?ixlib=rb-4.0.3&auto=format&fit=crop&w=2071&q=80') no-repeat center center/cover;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 2rem;
            color: var(--dark-color);
            border-left: 5px solid var(--primary-color);
            padding-left: 1rem;
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #0d47a1;
            transform: scale(1.05);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 8px;
            text-decoration: none;
            color: var(--dark-color);
            border: 1px solid #dee2e6;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        .social-icon {
            font-size: 1.5rem;
            margin: 0 10px;
            color: #ccc;
            transition: color 0.3s;
        }
        .social-icon:hover {
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section { padding: 80px 0; }
            .section-title { font-size: 2rem; }
            .stat-number { font-size: 2.5rem; }
        }