:root {
            --primary-color: #1a5276;
            --secondary-color: #d35400;
            --accent-color: #27ae60;
            --light-color: #f8f9fa;
            --dark-color: #2c3e50;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            padding: 8px 15px;
            margin: 0 3px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            background-color: var(--primary-color);
            color: white !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 82, 118, 0.85), rgba(26, 82, 118, 0.9)), url('https://images.unsplash.com/photo-1500835556837-99ac94a94552?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1470&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 12px 30px;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #b34700;
            border-color: #b34700;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .service-card, .advantage-card, .news-card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            overflow: hidden;
        }
        .service-card:hover, .advantage-card:hover, .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin: 0 auto 20px;
        }
        .about-section {
            background-color: #f9f9f9;
        }
        .about-img {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .advantage-icon {
            color: var(--accent-color);
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        .news-card .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .news-date {
            color: var(--secondary-color);
            font-weight: 600;
        }
        .partners-section {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.95)), url('https://images.unsplash.com/photo-1552733407-5d5c46c3bb3b?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1380&q=80');
            background-size: cover;
            background-position: center;
            color: white;
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            max-height: 80px;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-info {
            background-color: var(--primary-color);
            color: white;
            border-radius: var(--border-radius);
            padding: 30px;
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: rgba(255,255,255,0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
        }
        .friendlink {
            background-color: #f1f8ff;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px 10px;
            background-color: white;
            border-radius: var(--border-radius);
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #eaeaea;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        footer {
            background-color: var(--dark-color);
            color: #ccc;
            padding: 70px 0 20px;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            font-size: 0.9rem;
        }
        .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;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
            .section-padding {
                padding: 60px 0;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-padding {
                padding: 50px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 576px) {
            .hero-title {
                font-size: 1.9rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
        }