:root {
            --primary-color: #1a6fc4;
            --primary-light: #2c85e6;
            --primary-dark: #0d5aa7;
            --secondary-color: #f8f9fa;
            --accent-color: #17a2b8;
            --text-color: #333;
            --text-light: #666;
            --light-text: #fff;
            --border-radius: 8px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
            --transition: all 0.3s ease;
        }
        
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            scroll-behavior: smooth;
        }
        
        /* 通用样式 */
        .section-title {
            position: relative;
            display: inline-block;
            margin-bottom: 40px;
            padding-bottom: 15px;
            font-weight: 700;
            font-size: 28px;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            border: none;
            padding: 10px 20px;
            border-radius: var(--border-radius);
            transition: var(--transition);
            font-weight: 500;
        }
        
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        
        .btn-outline-primary {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transition: var(--transition);
        }
        
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            color: var(--light-text);
        }
        
        /* 顶部信息栏 */
        .top-bar {
            background-color: var(--secondary-color);
            padding: 15px 0;
            box-shadow: var(--shadow-sm);
        }
        
        .logo-container {
            display: flex;
            align-items: center;
        }
        
        .logo {
            width: 80px;
            height: 80px;
            background-color: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            border-radius: var(--border-radius);
            color: var(--light-text);
            font-weight: bold;
            font-size: 24px;
            box-shadow: var(--shadow-sm);
        }
        
        .company-name {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 5px;
        }
        
        .company-desc {
            font-size: 14px;
            color: var(--text-light);
        }
        
        .contact-info {
            display: flex;
            align-items: center;
            justify-content: flex-end;
        }
        
        .phone-icon {
            font-size: 28px;
            color: var(--primary-color);
            margin-right: 10px;
        }
        
        .phone-number {
            font-size: 20px;
            font-weight: bold;
            color: var(--primary-color);
            transition: var(--transition);
        }
        
        .phone-number:hover {
            color: var(--primary-dark);
        }
        
        /* 导航菜单 - 增大栏目间距 */
        .navbar {
            background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
            padding: 0;
            box-shadow: var(--shadow-md);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .navbar .nav-link {
            color: var(--light-text);
            font-size: 16px;
            padding: 28px 28px; /* 增加左右内边距，增大栏目间距 */
            margin: 0 5px; /* 增加栏目之间的外边距 */
            transition: var(--transition);
            position: relative;
        }
        
        .navbar .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--accent-color);
            transition: var(--transition);
        }
        
        .navbar .nav-link:hover::after,
        .navbar .nav-link.active::after {
            width: 100%;
        }
        
        .navbar .nav-link:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        /* 轮播图 */
        .carousel {
            position: relative;
        }
        
        .carousel-item {
            height: 700px;
            background-color: #ddd;
            background-size: cover;
            background-position: center;
        }
        
        .carousel-item:nth-child(1) {
            background-image: url("../images/ban.jpg");
        }
        
        .carousel-item:nth-child(2) {
            background-image: url("../images/ban2.jpg");
        }
        
        .carousel-item:nth-child(3) {
            background-image: url("../images/ban3.jpg");
        }
        
        .carousel-caption {
            background-color: rgba(0, 40, 195, 0.6);
            padding: 25px;
            border-radius: var(--border-radius);
            bottom: 30%;
            transform: translateY(50%);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .carousel-caption h2 {
            font-size: 36px;
            margin-bottom: 15px;
            animation: fadeInUp 1s ease;
        }
        
        .carousel-caption p {
            font-size: 18px;
            animation: fadeInUp 1s ease 0.3s forwards;
            opacity: 0;
        }
        
        /* 热门关键词 */
        .keywords {
            padding: 25px 0;
            background-color: var(--secondary-color);
        }
        
        .keywords-container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 15px;
        }
        
        .keyword-item {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
            position: relative;
            padding-right: 15px;
        }
        
        .keyword-item:not(:last-child)::after {
            content: '|';
            position: absolute;
            right: 0;
            color: var(--text-light);
        }
        
        .keyword-item:hover {
            color: var(--primary-dark);
            transform: translateX(3px);
        }
        
        /* 服务项目 */
        .services {
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }
        
        .services::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100px;
            background: linear-gradient(180deg, var(--secondary-color), transparent);
            z-index: 1;
        }
        
        .service-card {
            border: none;
            border-radius: var(--border-radius);
            padding: 30px;
            margin-bottom: 6px;
            transition: var(--transition);
            height: 100%;
            background-color: var(--light-text);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        
        .service-image {
            width: 356px;
            height: 230px;
            margin-bottom: 20px;
            border-radius: var(--border-radius);
            object-fit: cover;
            transition: var(--transition);
        }
        
        .service-card:hover .service-image {
            transform: scale(1.1);
        }
        
        .service-card h4 {
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        /* 关于我们 */
        .about {
            padding: 80px 0;
            background-color: var(--secondary-color);
        }
        
        .about-image {
            height: 350px;
            background-color: #ddd;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }
        
        .about-image:hover {
            transform: scale(1.02);
            box-shadow: var(--shadow-lg);
        }
        
        .about-content {
            padding: 20px;
        }
        
        .about-content h2 {
            margin-bottom: 25px;
        }
        
        .about-content p {
            margin-bottom: 15px;
            line-height: 1.8;
        }
        
        /* 核心优势 */
        .advantages {
            padding: 80px 0;
        }
        
        .advantage-card {
            text-align: center;
            padding: 30px;
            margin-bottom: 30px;
            background-color: var(--light-text);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        
        .advantage-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }
        
        .advantage-icon {
            font-size: 48px;
            color: var(--primary-color);
            margin-bottom: 20px;
            transition: var(--transition);
        }
        
        .advantage-card:hover .advantage-icon {
            color: var(--primary-dark);
            transform: rotate(5deg);
        }
        
        .advantage-card h4 {
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        /* 荣誉资质 */
        .certifications {
            padding: 80px 0;
            background-color: var(--secondary-color);
            overflow: hidden;
        }
        
        .cert-carousel {
            position: relative;
            max-width: 1000px;
            margin: 0 auto;
        }
        
        .cert-track {
            display: flex;
            transition: transform 0.5s ease;
        }
        
        .cert-card {
            min-width: 100%;
            height: 300px;
            background-color: var(--light-text);
            margin: 0 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            position: relative;
        }
        
        .cert-image {
            max-width: 90%;
            max-height: 90%;
            object-fit: contain;
        }
        
        .cert-controls {
            position: absolute;
            top: 50%;
            width: 100%;
            display: flex;
            justify-content: space-between;
            transform: translateY(-50%);
            z-index: 10;
        }
        
        .cert-prev, .cert-next {
            background-color: rgba(255, 255, 255, 0.7);
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        
        .cert-prev:hover, .cert-next:hover {
            background-color: white;
            transform: scale(1.1);
        }
        
        .cert-indicators {
            display: flex;
            justify-content: center;
            margin-top: 20px;
            gap: 10px;
        }
        
        .cert-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: #bbb;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .cert-dot.active {
            background-color: var(--primary-color);
            transform: scale(1.2);
        }
        
        /* 专业化的产品和服务 */
        .features {
            padding: 80px 0;
        }
        
        .feature-item {
            text-align: center;
            padding: 30px;
            transition: var(--transition);
        }
        
        .feature-icon {
            font-size: 48px;
            color: var(--primary-color);
            margin-bottom: 20px;
            transition: var(--transition);
            background-color: rgba(26, 111, 196, 0.1);
            width: 100px;
            height: 100px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: auto;
            margin-right: auto;
        }
        
        .feature-item:hover .feature-icon {
            background-color: var(--primary-color);
            color: var(--light-text);
            transform: scale(1.1);
        }
        
        .feature-item h4 {
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        /* 合作伙伴 */
        .partners {
            padding: 80px 0;
            background-color: var(--secondary-color);
        }
        
        .partner-logo {
            height: 90px;
            background-color: var(--light-text);
            margin: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            opacity: 0.8;
        }
        
        .partner-logo:hover {
            transform: scale(1.05);
            opacity: 1;
            box-shadow: var(--shadow-md);
        }
        
        /* 新闻中心 */
        .news {
            padding: 80px 0;
        }
        
        .news-container {
            display: flex;
            gap: 30px;
        }
        
        .news-main-image {
            flex: 1;
            height: 400px;
            border-radius: var(--border-radius);
            overflow: hidden;
            position: relative;
            box-shadow: var(--shadow-md);
        }
        
        .news-main-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .news-main-image:hover img {
            transform: scale(1.05);
        }
        
        .news-main-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background-color: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 15px;
        }
        
        .news-list {
            flex: 1;
        }
        
        .news-tabs .nav-link {
            color: var(--text-color);
            font-weight: 600;
            padding: 10px 20px;
            border: none;
            border-radius: 0;
            transition: var(--transition);
        }
        
        .news-tabs .nav-link.active {
            color: var(--primary-color);
            border-bottom: 3px solid var(--primary-color);
            background-color: transparent;
        }
        
        .news-tabs .nav-link:hover:not(.active) {
            color: var(--primary-light);
            background-color: transparent;
        }
        
        .news-item {
            margin-bottom: 30px;
            padding-bottom: 30px;
            border-bottom: 1px solid #eee;
            transition: var(--transition);
            display: flex;
            align-items: center;
        }
        
        .news-item:hover {
            transform: translateX(5px);
        }
        
        .news-image {
            height: 120px;
            width: 120px;
            background-color: #ddd;
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition);
        }
        
        .news-item:hover .news-image {
            transform: scale(1.05);
        }
        
        .news-content {
            padding-left: 20px;
        }
        
        .news-content h5 {
            margin-bottom: 8px;
            transition: var(--transition);
        }
        
        .news-item:hover .news-content h5 {
            color: var(--primary-color);
        }
        
        .news-content .date {
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        
        /* 友情链接 */
        .friend-links {
            background-color: var(--secondary-color);
            padding: 30px 0;
        }
        
        .friend-links h5 {
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        .friend-links a {
            color: var(--text-light);
            transition: var(--transition);
            display: inline-block;
        }
        
        .friend-links a:hover {
            color: var(--primary-color);
            transform: translateX(3px);
        }
        
        /* 底部 */
        footer {
            background-color: #2c3e50;
            color: var(--light-text);
            padding: 80px 0 30px;
            position: relative;
        }
        
        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
        }
        
        .footer-title {
            font-weight: 600;
            margin-bottom: 25px;
            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-contact p {
            margin-bottom: 12px;
            display: flex;
            align-items: center;
        }
        
        .footer-contact i {
            margin-right: 10px;
            color: var(--accent-color);
            width: 20px;
        }
        
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
            display: inline-block;
        }
        
        .footer-links a:hover {
            color: var(--light-text);
            transform: translateX(5px);
        }
        
        .footer-qrcode {
            display: flex;
            gap: 20px;
        }
        
        .qrcode-item {
            text-align: center;
        }
        
        .qrcode-img {
            background-color: var(--light-text);
            width: 100px;
            height: 100px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: var(--text-color);
        }
        
        .copyright {
            border-top: 1px solid #4a6572;
            padding-top: 25px;
            margin-top: 50px;
            text-align: center;
            font-size: 14px;
            color: #95a5a6;
        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: var(--light-text);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            cursor: pointer;
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            z-index: 999;
        }
        
        .back-to-top:hover {
            background-color: var(--primary-dark);
            transform: translateY(-5px);
        }
        
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* 响应式调整 - 针对导航菜单 */
        @media (max-width: 992px) {
            .carousel-item {
                height: 500px;
            }
            
            .carousel-caption h2 {
                font-size: 28px;
            }
            
            .carousel-caption p {
                font-size: 16px;
            }
            
            .news-container {
                flex-direction: column;
            }
            
            .news-main-image {
                height: 300px;
            }
            
            /* 中等屏幕导航间距调整 */
            .navbar .nav-link {
                padding: 18px 20px;
                margin: 0 3px;
            }
        }
        
        @media (max-width: 768px) {
            .carousel-item {
                height: 400px;
            }
            
            .carousel-caption {
                padding: 15px;
                bottom: 20%;
            }
            
            .carousel-caption h2 {
                font-size: 24px;
            }
            
            .carousel-caption p {
                font-size: 14px;
            }
            
            .company-name {
                font-size: 20px;
            }
            
            .phone-number {
                font-size: 18px;
            }
            
            .section-title {
                font-size: 24px;
            }
            
            .about-image {
                height: 280px;
                margin-bottom: 30px;
            }
            
            /* 小屏幕导航间距调整 */
            .navbar .nav-link {
                padding: 15px 15px;
                margin: 0;
            }
            
            .cert-card {
                height: 250px;
            }
        }
        
        @media (max-width: 576px) {
            .carousel-item {
                height: 300px;
            }
            
            .carousel-caption {
                padding: 10px;
                bottom: 15%;
            }
            
            .carousel-caption h2 {
                font-size: 20px;
                margin-bottom: 10px;
            }
            
            .carousel-caption p {
                font-size: 12px;
            }
            
            .logo {
                width: 60px;
                height: 60px;
                font-size: 18px;
            }
            
            .company-name {
                font-size: 18px;
            }
            
            .company-desc {
                font-size: 12px;
            }
            
            .phone-icon {
                font-size: 20px;
            }
            
            .phone-number {
                font-size: 16px;
            }
            
            .service-card, .advantage-card {
                padding: 20px;
            }
            
            .service-image {
                width: 60px;
                height: 60px;
            }
            
            .advantage-icon, .feature-icon {
                font-size: 36px;
            }
            
            .feature-icon {
                width: 80px;
                height: 80px;
            }
            
            .news-item {
                flex-direction: column;
            }
            
            .news-content {
                padding-left: 0;
                padding-top: 15px;
                width: 100%;
            }
            
            .news-image {
                width: 100%;
                height: 180px;
            }
            
            .footer-qrcode {
                flex-direction: column;
                gap: 15px;
            }
            
            .qrcode-item {
                margin: 0 auto;
            }
            
            .cert-prev, .cert-next {
                width: 40px;
                height: 40px;
            }
            
            .cert-card {
                height: 200px;
            }
        }