:root {
            --primary-color: #0056b3;
            --secondary-color: #f8f9fa;
            --accent-color: #ff6b35;
            --dark-color: #343a40;
            --light-color: #ffffff;
            --text-dark: #333333;
            --text-light: #666666;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .container-fluid {
            padding: 0 15px;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        .navbar-brand img {
            height: 50px;
            margin-right: 10px;
        }
        .nav-link {
            color: var(--dark-color);
            font-weight: 500;
            margin: 0 10px;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
        }
        .navbar-toggler {
            border: none;
            padding: 0;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(0, 86, 179, 0.9)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 25px;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 35px;
            opacity: 0.9;
        }
        .hero-btn {
            background-color: var(--accent-color);
            border: none;
            padding: 14px 35px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .hero-btn:hover {
            background-color: #e05a2b;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .section {
            padding: 100px 0;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--primary-color);
            position: relative;
            padding-bottom: 15px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 4px;
            background-color: var(--accent-color);
        }
        .section-subtitle {
            font-size: 1.2rem;
            color: var(--text-light);
            margin-bottom: 60px;
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .card-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .product-card {
            border-top: 4px solid var(--primary-color);
        }
        .product-card .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .service-card {
            padding: 30px;
            text-align: center;
            border-top: 4px solid var(--accent-color);
        }
        .advantage-card {
            padding: 30px;
            text-align: center;
            background-color: var(--secondary-color);
        }
        .about-content {
            padding-right: 30px;
        }
        .about-img {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
        .about-img img {
            width: 100%;
            height: auto;
            transition: transform 0.5s;
        }
        .about-img:hover img {
            transform: scale(1.03);
        }
        .partner-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 15px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        .partner-logo:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .partner-logo img {
            max-width: 100%;
            max-height: 50px;
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s;
        }
        .partner-logo:hover img {
            filter: grayscale(0);
            opacity: 1;
        }
        .stats-section {
            background: linear-gradient(rgba(0, 86, 179, 0.9), rgba(0, 86, 179, 0.95)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 0;
        }
        .stat-item {
            text-align: center;
            padding: 20px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .stat-text {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
        }
        .news-date {
            color: var(--accent-color);
            font-weight: 600;
            margin-bottom: 10px;
        }
        .contact-info {
            margin-bottom: 30px;
        }
        .contact-icon {
            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;
            margin-right: 15px;
        }
        .contact-form {
            background-color: var(--secondary-color);
            padding: 40px;
            border-radius: 10px;
        }
        .form-control, .form-select {
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            margin-bottom: 20px;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }
        .submit-btn {
            background-color: var(--primary-color);
            color: white;
            padding: 14px 35px;
            border: none;
            border-radius: 4px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .submit-btn:hover {
            background-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .friendlink {
            background-color: var(--secondary-color);
            padding: 80px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background-color: white;
            border-radius: 4px;
            color: var(--text-dark);
            text-decoration: none;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            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(--dark-color);
            color: white;
            padding: 70px 0 20px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            margin-bottom: 20px;
            display: block;
        }
        .footer-title {
            font-size: 1.3rem;
            margin-bottom: 25px;
            color: white;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--accent-color);
        }
        .footer-link {
            color: #bbb;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-contact {
            color: #bbb;
            margin-bottom: 15px;
        }
        .footer-contact i {
            color: var(--accent-color);
            margin-right: 10px;
            width: 20px;
        }
        .copyright {
            border-top: 1px solid #444;
            padding-top: 20px;
            margin-top: 50px;
            text-align: center;
            color: #aaa;
            font-size: 0.9rem;
        }
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        .social-icon {
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
        }
        .social-icon:hover {
            background-color: var(--accent-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;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section {
                padding: 70px 0;
            }
            .about-content {
                padding-right: 0;
                margin-bottom: 40px;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .contact-form {
                padding: 30px 20px;
            }
        }
        @media (max-width: 576px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .section {
                padding: 50px 0;
            }
            .flink {
                display: block;
                text-align: center;
                margin: 8px 0;
            }
        }