:root {
            --primary-color: #0066cc;
            --secondary-color: #00a86b;
            --dark-color: #1a1a1a;
            --light-color: #f8f9fa;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 102, 204, 0.8), rgba(0, 168, 107, 0.8)), url('https://images.unsplash.com/photo-1549399542-7e3f8b79c341?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
            text-align: center;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--secondary-color);
            display: inline-block;
            padding-bottom: 10px;
            margin-bottom: 30px;
            font-weight: bold;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: bold;
            transition: background-color 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px;
            background-color: var(--light-color);
            border-radius: 8px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #ddd;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 50px 0;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 40px 0 20px;
        }
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin: 0 10px;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: var(--secondary-color);
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        .news-item {
            border-left: 4px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 20px;
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            border-radius: 12px 12px 0 0;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }