:root {
            --primary-color: #1a6fb3;
            --secondary-color: #00a859;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --accent-color: #e63946;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            overflow-x: hidden;
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
            position: relative;
            padding-bottom: 1rem;
        }
        .section-header:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1593941707882-a5bba5338fe2?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            position: relative;
            margin-top: 80px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            color: white;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            color: white;
        }
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 2.5rem 1.8rem;
            text-align: center;
            height: 100%;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-top: 5px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            border-top: 5px solid var(--primary-color);
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            display: inline-block;
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.12);
        }
        .product-img {
            height: 240px;
            object-fit: cover;
            width: 100%;
        }
        .news-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            padding: 10px 15px;
            display: inline-block;
            border-radius: 5px;
            font-weight: 600;
            position: absolute;
            top: 15px;
            left: 15px;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
            padding-left: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -38px;
            top: 5px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 4px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .contact-info-card {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            text-align: center;
            box-shadow: var(--shadow);
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-card:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.2rem;
        }
        .footer {
            background-color: var(--dark-color);
            color: rgba(255,255,255,0.8);
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.8rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--primary-color);
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 10px 25px;
            margin: 5px 10px;
            border-radius: 50px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: var(--transition);
            border: 1px solid #eee;
            font-weight: 500;
            color: #555;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        .sticky-nav {
            background-color: rgba(255,255,255,0.98);
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            transition: var(--transition);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 50px;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-5px);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-text {
            font-size: 1.1rem;
            color: var(--dark-color);
            font-weight: 600;
        }
        .video-play-btn {
            width: 80px;
            height: 80px;
            background: rgba(255,255,255,0.9);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-size: 2rem;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            transition: var(--transition);
        }
        .video-play-btn:hover {
            background: var(--primary-color);
            color: white;
        }
        .form-control-custom {
            border-radius: 8px;
            padding: 12px 15px;
            border: 1px solid #ddd;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 111, 179, 0.25);
        }
        .accordion-button {
            font-weight: 600;
            padding: 1.2rem 1.5rem;
            border-radius: 8px !important;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(26, 111, 179, 0.1);
            color: var(--primary-color);
            box-shadow: none;
        }
        .accordion-button:focus {
            border-color: rgba(26, 111, 179, 0.3);
            box-shadow: 0 0 0 0.25rem rgba(26, 111, 179, 0.1);
        }
        .certification-logo {
            filter: grayscale(100%);
            opacity: 0.8;
            transition: var(--transition);
            max-height: 60px;
        }
        .certification-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .map-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            padding: 0.5rem 1rem;
            margin: 0 0.2rem;
            border-radius: 5px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: rgba(26, 111, 179, 0.1);
            color: var(--primary-color);
        }
        .animated-element {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        .animated-element.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .hero-carousel {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .carousel-indicators button {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            margin: 0 5px;
        }
        .section-spacing {
            padding: 5.5rem 0;
        }
        @media (max-width: 768px) {
            .section-spacing {
                padding: 3.5rem 0;
            }
        }
        .about-img {
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .gradient-bg {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        }