:root {
            --primary-color: #0056b3;
            --secondary-color: #ff6b35;
            --dark-color: #333;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            background-color: var(--primary-color);
            color: white !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 180, 0.85), rgba(0, 84, 180, 0.9)), url('https://images.unsplash.com/photo-1492144534655-ae79c964c9d7?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0;
            text-align: center;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .hero-section p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border: none;
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            border-radius: 30px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #e05a2b;
            transform: scale(1.05);
            box-shadow: 0 6px 15px rgba(255, 107, 53, 0.4);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            height: 100%;
            transition: transform 0.4s, box-shadow 0.4s;
            border-top: 5px solid var(--primary-color);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .product-card {
            border: 1px solid #eaeaea;
            border-radius: 10px;
            overflow: hidden;
            transition: all 0.3s;
            height: 100%;
        }
        .product-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 12px 25px rgba(0, 86, 179, 0.15);
        }
        .product-card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding: 1.5rem 0;
            transition: background-color 0.3s;
        }
        .news-item:hover {
            background-color: #f9f9f9;
        }
        .contact-info {
            background-color: var(--light-color);
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-right: 1.5rem;
            flex-shrink: 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            color: var(--dark-color);
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 6px;
            text-decoration: none;
            border: 1px solid #ddd;
            transition: all 0.3s;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding-top: 3rem;
        }
        footer a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .footer-bottom {
            background-color: #1a252f;
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0;
            }
            .navbar-nav {
                text-align: center;
                padding-top: 1rem;
            }
            .contact-info {
                margin-bottom: 2rem;
            }
        }