:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --accent-color: #ff6b35;
            --light-bg: #f8f9fa;
            --dark-text: #333333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-text);
            line-height: 1.6;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            color: var(--dark-text) !important;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            bottom: 0;
            left: 50%;
            transition: var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
            left: 0;
        }
        .hero {
            background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(0, 86, 179, 0.9)), 
                        url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
            margin-top: 76px;
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        .feature-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
        }
        .product-card:hover {
            transform: scale(1.03);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
        }
        .product-img {
            height: 250px;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .timeline {
            position: relative;
            padding: 2rem 0;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 3px;
            height: 100%;
            background: var(--primary-color);
        }
        .timeline-item {
            margin-bottom: 3rem;
            position: relative;
        }
        .timeline-content {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            position: relative;
            width: 45%;
        }
        .timeline-item:nth-child(odd) .timeline-content {
            margin-left: 55%;
        }
        .timeline-item:nth-child(even) .timeline-content {
            margin-right: 55%;
        }
        .stats-section {
            background: linear-gradient(135deg, var(--primary-color), #003d82);
            color: white;
            padding: 5rem 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .friendlink {
            background-color: var(--light-bg);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            margin: 0.5rem;
            background: white;
            border-radius: 50px;
            text-decoration: none;
            color: var(--dark-text);
            font-weight: 500;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            border: 1px solid #eee;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 4rem 0 2rem;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            color: white;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            .timeline::before {
                left: 30px;
            }
            .timeline-content {
                width: calc(100% - 80px);
                margin-left: 80px !important;
            }
        }
        @media (max-width: 768px) {
            .hero {
                padding: 5rem 0;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .flink {
                display: block;
                margin: 0.5rem 0;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fadeInUp {
            animation: fadeInUp 0.8s ease forwards;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 86, 179, 0.2);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }