:root {
            --primary-color: #1a365d;
            --secondary-color: #2c5282;
            --accent-color: #e53e3e;
            --light-gray: #f7fafc;
            --dark-gray: #4a5568;
            --text-color: #2d3748;
            --border-color: #e2e8f0;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Noto Sans SC', 'Roboto', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-color);
        }
        .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: 1.5rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--accent-color);
        }
        .hero {
            background: linear-gradient(rgba(26, 54, 93, 0.8), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 8rem 0 6rem;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .hero-btn {
            background-color: var(--accent-color);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 5px;
            font-weight: 500;
            border: none;
            transition: var(--transition);
        }
        .hero-btn:hover {
            background-color: #c53030;
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        section {
            padding: 5rem 0;
        }
        .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: 3px;
            background-color: var(--accent-color);
        }
        .section-subtitle {
            color: var(--dark-gray);
            text-align: center;
            max-width: 800px;
            margin: 0 auto 3rem;
        }
        .about-content {
            background-color: var(--light-gray);
            border-radius: 10px;
            padding: 3rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .product-card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .product-img {
            height: 220px;
            overflow: hidden;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img img {
            transform: scale(1.05);
        }
        .product-content {
            padding: 1.5rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .product-title {
            font-size: 1.3rem;
            margin-bottom: 0.8rem;
        }
        .product-desc {
            color: var(--dark-gray);
            flex-grow: 1;
            margin-bottom: 1.2rem;
        }
        .advantage-card {
            text-align: center;
            padding: 2rem 1.5rem;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            height: 100%;
        }
        .advantage-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .advantage-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 54, 93, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .news-card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
        }
        .news-date {
            background-color: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            display: inline-block;
            border-radius: 5px;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }
        .contact-info {
            background-color: var(--light-gray);
            border-radius: 10px;
            padding: 2rem;
            height: 100%;
        }
        .contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 1.5rem;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--primary-color);
            font-size: 1.3rem;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
        }
        .friendlink {
            background-color: var(--light-gray);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            margin: 0.5rem;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 4rem 0 1.5rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid rgba(255, 255, 255, 0.2);
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 0.7rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #c53030;
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            section {
                padding: 4rem 0;
            }
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.3rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .about-content {
                padding: 2rem;
            }
        }
        @media (max-width: 576px) {
            .hero {
                padding: 6rem 0 4rem;
                min-height: auto;
            }
            .hero h1 {
                font-size: 2rem;
            }
            section {
                padding: 3rem 0;
            }
        }