:root {
            --primary-color: #1a365d;
            --secondary-color: #e6b325;
            --accent-color: #2d3748;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.8), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1441986300917-64674bd600d8?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            color: var(--primary-color);
            border-left: 5px solid var(--secondary-color);
            padding-left: 15px;
            margin-bottom: 30px;
        }
        .card {
            border: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            transition: transform 0.3s ease;
        }
        .card:hover {
            transform: translateY(-5px);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        .friendlink .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px;
            background: #f1f1f1;
            border-radius: 20px;
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        .friendlink .flink:hover {
            background: var(--primary-color);
            color: white;
        }
        footer {
            background-color: var(--accent-color);
            color: white;
        }
        .sticky-top {
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .img-hover {
            overflow: hidden;
        }
        .img-hover img {
            transition: transform 0.5s ease;
        }
        .img-hover:hover img {
            transform: scale(1.05);
        }
        .stats {
            background-color: var(--light-color);
            padding: 50px 0;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .display-4 {
                font-size: 2.2rem;
            }
        }