/* 基础样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', Arial, sans-serif;
        }
        
        body {
            color: #333;
            line-height: 1.6;
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        ul {
            list-style: none;
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        .container {
            width: 100%;
            max-width: 1310px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        .section {
            padding: 60px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 40px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 32px;
            color: #1a365d;
            display: inline-block;
            padding-bottom: 15px;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: #2b6cb0;
        }
        
        /* 顶部导航栏 */
        .header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            height: 50px;
            display: flex;
            align-items: center;
        }
        
        .logo img {
            height: 100%;
        }
        
        .nav-menu {
            display: flex;
        }
        
        .nav-item {
            position: relative;
            margin: 0 15px;
        }
        
        .nav-link {
            font-size: 16px;
            font-weight: 500;
            padding: 10px 0;
            display: block;
            position: relative;
            transition: color 0.3s;
        }
        
        .nav-link:hover {
            color: #2b6cb0;
        }
        
        /* 新增：导航箭头样式 */
        .nav-arrow {
            display: inline-block;
            width: 0;
            height: 0;
            border-left: 5px solid transparent;
            border-right: 5px solid transparent;
            border-top: 5px solid #666;
            margin-left: 5px;
            transition: transform 0.3s;
        }
        
        .dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background: #fff;
            min-width: 220px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease;
            z-index: 100;
            border-radius: 4px;
            border-top: 3px solid #2b6cb0;
        }
        
        .dropdown-item {
            position: relative;
        }
        
        .dropdown-link {
            padding: 12px 20px;
            display: block;
            border-bottom: 1px solid #f1f1f1;
            transition: background 0.3s;
        }
        
        .dropdown-link:hover {
            background: #f1f8ff;
            color: #2b6cb0;
        }
        
        /* 修复：二级、三级、四级菜单样式 */
        .sub-dropdown {
            position: absolute;
            top: 0;
            left: 100%;
            background: #fff;
            min-width: 220px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateX(10px);
            transition: all 0.3s ease;
            z-index: 100;
            border-radius: 4px;
            border-top: 3px solid #4299e1;
        }
        
        .sub-sub-dropdown {
            position: absolute;
            top: 0;
            left: 100%;
            background: #fff;
            min-width: 220px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateX(10px);
            transition: all 0.3s ease;
            z-index: 100;
            border-radius: 4px;
            border-top: 3px solid #63b3ed;
        }
        
        .dropdown-arrow {
            display: inline-block;
            width: 0;
            height: 0;
            border-top: 5px solid transparent;
            border-bottom: 5px solid transparent;
            border-left: 5px solid #666;
            margin-left: 8px;
        }
        
        .nav-item:hover > .dropdown,
        .dropdown-item:hover > .sub-dropdown,
        .sub-dropdown-item:hover > .sub-sub-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translate(0);
        }
        .sub-dropdown-item a{
            padding: 12px 20px;
            display: block;
            border-bottom: 1px solid #f1f1f1;
            transition: background 0.3s;
        }
        .sub-sub-dropdown li a{
            padding: 12px 20px;
            display: block;
            border-bottom: 1px solid #f1f1f1;
            transition: background 0.3s;
        }
        
        /* 汉堡菜单 */
        .hamburger {
            display: none;
            cursor: pointer;
            padding: 10px;
        }
        
        .hamburger span {
            display: block;
            width: 25px;
            height: 3px;
            background: #333;
            margin: 5px 0;
            transition: all 0.3s;
        }
        
        /* 轮播图 */
        .banner {
            position: relative;
            height: auto;
            overflow: hidden;
        }
        .slides {
            height: 100%;
            position: relative;
        }
        
        .slide {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 1s ease-in-out;
            background-size: cover;
            background-position: center;
        }
        
        .slide.active {
            opacity: 1;
        }
        
        .slide:nth-child(1) {
            background-color: #1a365d;
        }
        
        .slide:nth-child(2) {
            background-color: #2b6cb0;
        }
        
        .slide:nth-child(3) {
            background-color: #2c5282;
        }
        
        .slide-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: white;
            width: 80%;
        }
        
        .slide-content h2 {
            font-size: 42px;
            margin-bottom: 20px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .slide-content p {
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto;
            text-shadow: 0 1px 2px rgba(0,0,0,0.3);
        }
        
        .dots {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
        }
        
        .dot {
            width: 12px;
            height: 12px;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            margin: 0 5px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .dot.active {
            background: white;
            transform: scale(1.3);
        }
        
        /* 产品中心 */
        .products {
            background-color: #fff;
        }
        
        .product-categories {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        
        .category-item {
            position: relative;
            margin: 0 10px 20px;
        }
        
        .category-link {
            display: flex;
            align-items: center;
            padding: 12px 25px;
            background: #2b6cb0;
            color: white;
            border-radius: 4px;
            font-weight: 500;
            transition: background 0.3s;
            text-align: center;
        }
        
        .category-link:hover {
            background: #1a365d;
        }
        
        /* 新增：产品分类箭头 */
        .category-arrow {
            display: inline-block;
            width: 0;
            height: 0;
            border-left: 5px solid transparent;
            border-right: 5px solid transparent;
            border-top: 5px solid white;
            margin-left: 8px;
        }
        
        .product-submenu {
            position: absolute;
            top: 100%;
            left: 0;
            background: #fff;
            min-width: 220px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease;
            z-index: 100;
            border-radius: 4px;
            border-top: 3px solid #4299e1;
        }
        
        .product-submenu-item {
            position: relative;
        }
        
        .product-submenu-item a {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 20px;
            border-bottom: 1px solid #f1f1f1;
            transition: background 0.3s;
            color: #333;
        }
        
        /* 新增：产品子菜单箭头 */
        .product-submenu-arrow {
            display: inline-block;
            width: 0;
            height: 0;
            border-top: 5px solid transparent;
            border-bottom: 5px solid transparent;
            border-left: 5px solid #666;
            margin-left: 8px;
        }
        
        /* 新增：产品三级菜单 */
        .product-sub-submenu {
            position: absolute;
            top: 0;
            left: 100%;
            background: #fff;
            min-width: 220px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateX(10px);
            transition: all 0.3s ease;
            z-index: 100;
            border-radius: 4px;
            border-top: 3px solid #63b3ed;
        }
        
        .product-submenu-item a:hover {
            background: #f1f8ff;
            color: #2b6cb0;
        }
        
        .category-item:hover .product-submenu,
        .product-submenu-item:hover .product-sub-submenu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .product-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }
        
        .product-card {
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .product-img {
            height: 200px;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 60px;
            color: #718096;
        }
        
        .product-info {
            padding: 20px;
            text-align: center;
        }
        
        .product-name {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        
        .product-orders {
            color: #e53e3e;
            font-weight: 500;
        }
        
        /* 资讯中心 */
        .news {
            background-color: #f8f9fa;
        }
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }
        
        .news-column h3 {
            font-size: 20px;
            color: #2b6cb0;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e2e8f0;
        }
        
        .news-item {
            display: flex;
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid #edf2f7;
            align-items: flex-start;
        }
        
        .news-item:last-child {
            border-bottom: none;
        }
        
        .news-thumb {
            width: 160px;
            height: 102px;
            margin-right: 15px;
            border-radius: 4px;
            overflow: hidden;
            flex-shrink: 0;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
        }
        
        .news-content {
            flex: 1;
        }
        
        .news-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            display: block;
        }
        
        .news-title:hover {
            color: #2b6cb0;
        }
        
        .news-desc {
            color: #718096;
            font-size: 14px;
        }
        
        /* 关于我们 */
        .about {
            background-color: #fff;
        }
        
        .about-content {
            display: flex;
            flex-direction: column;
        }
        
        .about-video {
            background-color: #e2e8f0;
            height: auto;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            position: relative;
            overflow: hidden;
            margin-bottom: 30px;
        }
        
        .play-btn {
            width: 80px;
            height: 80px;
            background: rgba(255, 255, 255, 0.8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 2;
        }
        
        .play-btn:before {
            content: '';
            width: 0;
            height: 0;
            border-top: 15px solid transparent;
            border-bottom: 15px solid transparent;
            border-left: 25px solid #2b6cb0;
            margin-left: 5px;
        }
        .about-text img{
            display: inline-block !important;
            margin: 0 auto !important;
            vertical-align: middle;
            max-width: 100%;
            height: auto;
            height: auto !important;
        }
        .about-text {
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
        }
        
        .about-text h3 {
            font-size: 28px;
            color: #1a365d;
            margin-bottom: 20px;
            text-align: center;
        }
        
        .about-text p {
            margin-bottom: 15px;
            color: #4a5568;
            text-align: justify;
            font-size: 18px;
        }
        
        /* 友情链接 */
        .links {
            background-color: #f8f9fa;
            padding: 40px 0;
        }
        
        .link-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .link-title {
            font-size: 18px;
            color: #718096;
            margin-right: 20px;
            white-space: nowrap;
        }
        
        .link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .link-item a {
            display: block;
            color: #4a5568;
            padding: 5px 0;
            position: relative;
            transition: color 0.3s;
        }
        
        .link-item a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 1px;
            background: #2b6cb0;
            transition: width 0.3s;
        }
        
        .link-item a:hover {
            color: #2b6cb0;
        }
        
        .link-item a:hover:after {
            width: 100%;
        }
        
        /* 底部 */
        .footer {
            background: #1a365d;
            color: white;
            padding: 60px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background: #2b6cb0;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: #cbd5e0;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .contact-info {
            margin-bottom: 20px;
        }
        
        .contact-item {
            display: flex;
            margin-bottom: 15px;
        }
        
        .contact-icon {
            margin-right: 10px;
            color: #2b6cb0;
        }
        
        .qrcode {
            background: #fff;
            padding: 10px;
            border-radius: 4px;
            display: inline-block;
        }
        
        .qrcode img {
            width: auto;
            height: auto;
            display: block;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #a0aec0;
            font-size: 14px;
        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: #4299e1;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 999;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:before {
            content: '';
            width: 0;
            height: 0;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-bottom: 15px solid white;
        }
        
        /* 响应式设计 */
        @media (max-width: 1310px) {
            .footer-content {
                gap: 20px;
            }
        }
        
        @media (max-width: 992px) {
            .product-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            
            .nav-menu {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background: white;
                flex-direction: column;
                box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
                transition: all 0.4s;
                padding: 20px 0;
                height: calc(100vh - 80px);
                overflow-y: auto;
            }
            
            .nav-menu.active {
                left: 0;
            }
            
            .nav-item {
                margin: 0;
                width: 100%;
            }
            
            .nav-link {
                padding: 12px 20px;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            
            .nav-arrow {
                transform: rotate(0deg);
                transition: transform 0.3s;
            }
            
            .nav-link.active .nav-arrow {
                transform: rotate(180deg);
            }
            
            .dropdown {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s;
                min-width: auto;
                border-top: none;
            }
            
            .dropdown.active {
                max-height: 500px;
            }
            
            .dropdown-link {
                padding-left: 40px;
            }
            
            /* 修复：移动端下拉菜单样式 */
            .sub-dropdown, .sub-sub-dropdown {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s;
                min-width: auto;
                border-top: none;
                width: 100%;
            }
            
            .sub-dropdown.active, .sub-sub-dropdown.active {
                max-height: 500px;
            }
            
            .banner {
                height: auto;
            }
            
            .slide-content h2 {
                font-size: 28px;
            }
            
            .slide-content p {
                font-size: 16px;
            }
            
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            
            .news-grid {
                grid-template-columns: 1fr;
            }
            
            .about-video {
                height: 300px;
            }
            
            .link-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .link-title {
                margin-bottom: 15px;
                margin-right: 0;
            }
            
            .link-list {
                width: 100%;
            }
            
            /* 底部导航栏移动端布局 */
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
                row-gap: 40px;
            }
            
            /* 将服务支持和联系我们放在第二行 */
            .footer-column:nth-child(3) {
                grid-row: 2;
                grid-column: 1;
            }
            
            .footer-column:nth-child(4) {
                grid-row: 2;
                grid-column: 2;
            }
            
            /* 移动端产品分类菜单 */
            .product-categories {
                flex-direction: column;
                align-items: stretch;
            }
            
            .category-item {
                margin: 0 0 10px 0;
            }
            
            .category-link {
                justify-content: space-between;
            }
            
            .product-submenu, .product-sub-submenu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s;
                min-width: auto;
                border-top: none;
                width: 100%;
            }
            
            .product-submenu.active, .product-sub-submenu.active {
                max-height: 500px;
            }
            
            .product-submenu-item a {
                padding-left: 30px;
            }
            
            .product-sub-submenu li a {
                padding-left: 50px;
            }
        }
        
        @media (max-width: 576px) {
            .banner {
                height: auto;
            }
            
            .news-item {
                flex-direction: column;
            }
            
            .news-thumb {
                margin-right: 0;
                margin-bottom: 10px;
                width: 100%;
                height: 150px;
            }
            
            /* 确保产品展示在移动端保持两列 */
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            /* 修复移动端右侧空白 */
            .container {
                padding: 0 10px;
            }
            
            .section {
                padding: 40px 0;
            }
        }
        
        @media (max-width: 400px) {
            .footer-content {
                grid-template-columns: 1fr;
            }
            
            .footer-column:nth-child(3),
            .footer-column:nth-child(4) {
                grid-row: auto;
                grid-column: auto;
            }
        }