:root {
            --primary-color: #0056a6;
            --secondary-color: #f0a31e;
            --dark-color: #1e2a47;
            --light-color: #f8f9fa;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--text-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 60px;
            position: relative;
        }
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--dark-color);
            font-weight: 700;
            display: inline-block;
            padding-bottom: 15px;
        }
        .section-title h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #004085;
            border-color: #004085;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98) !important;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .navbar-brand img {
            max-height: 50px;
            margin-right: 10px;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 10px;
            padding: 8px 15px !important;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
            background-color: rgba(0, 86, 166, 0.05);
        }
        .hero-section {
            background: linear-gradient(rgba(30, 42, 71, 0.85), rgba(30, 42, 71, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 160px 0 120px;
            position: relative;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
        }
        .hero-section p {
            font-size: 1.2rem;
            margin-bottom: 35px;
            max-width: 700px;
        }
        .floating-icon {
            animation: float 3s ease-in-out infinite;
        }
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-15px); }
            100% { transform: translateY(0px); }
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 40px 30px;
            text-align: center;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            border-top: 5px solid var(--primary-color);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .feature-card .icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 25px;
        }
        .product-card {
            border: 1px solid #eee;
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .product-card:hover {
            box-shadow: var(--box-shadow);
            transform: translateY(-5px);
        }
        .product-card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .product-card-body {
            padding: 25px;
        }
        .product-card-title {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 15px;
        }
        .news-card {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .news-card:hover {
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .news-date {
            background-color: var(--primary-color);
            color: white;
            padding: 10px 20px;
            display: inline-block;
            border-radius: 0 0 var(--border-radius) 0;
            font-weight: 600;
            position: absolute;
            top: 0;
            left: 0;
        }
        .contact-info-box {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
            height: 100%;
            border-left: 4px solid var(--secondary-color);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-info-box .icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .footer {
            background-color: var(--dark-color);
            color: #bbb;
            padding: 70px 0 20px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid rgba(255, 255, 255, 0.1);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 50px;
            text-align: center;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 40px 0;
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 10px 25px;
            margin: 8px;
            border-radius: 50px;
            border: 1px solid #ddd;
            color: var(--dark-color);
            font-weight: 600;
            transition: var(--transition);
            text-decoration: none !important;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: var(--dark-color);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .section-title h2 {
                font-size: 2rem;
            }
            .navbar-nav .nav-link {
                margin: 5px 0;
            }
        }