:root {
            --primary-color: #e63946;
            --secondary-color: #1d3557;
            --accent-color: #a8dadc;
            --light-color: #f1faee;
            --dark-color: #1d3557;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(29, 53, 87, 0.8), rgba(168, 218, 220, 0.7)), url('https://images.unsplash.com/photo-1511285560929-80b456fea0bc?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            margin-bottom: 50px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .section-title {
            color: var(--secondary-color);
            font-weight: 700;
            padding-bottom: 15px;
            margin-bottom: 30px;
            position: relative;
            border-bottom: 3px solid var(--accent-color);
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #c1121f;
            border-color: #c1121f;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(230, 57, 70, 0.3);
        }
        .badge-custom {
            background-color: var(--accent-color);
            color: var(--secondary-color);
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
        }
        .video-container {
            position: relative;
            padding-bottom: 56.25%;
            height: 0;
            overflow: hidden;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .video-container iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .flink {
            background: white;
            padding: 15px 25px;
            border-radius: 10px;
            text-align: center;
            color: var(--secondary-color);
            font-weight: 600;
            text-decoration: none;
            display: block;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }
        .flink:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: translateY(-5px);
        }
        footer {
            background-color: var(--secondary-color);
            color: white;
            padding-top: 50px;
            margin-top: 50px;
        }
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin: 0 10px;
            transition: color 0.3s ease;
        }
        .social-icons a:hover {
            color: var(--accent-color);
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 20px 0;
            margin-top: 30px;
        }
        .stats-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .stats-label {
            font-size: 1rem;
            color: #666;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .nav-link {
            font-weight: 600;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            transition: all 0.3s ease;
        }
        .back-to-top.active {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .stats-number {
                font-size: 2rem;
            }
        }