/* 首页导航样式 */
        body {
            font-family: Arial, sans-serif; 
            margin: 0; 
            padding: 0; 
            box-sizing: border-box; 
        }

        .header-content {
            display: flex; 
            justify-content: center; 
            align-items: center; 
            padding: 1rem; 
            background-color: #fff; 
        }

        .logo {
            margin-right: 15rem;
        }

        .logo img,
        .ad img {
            border: 1px solid #ddd;
            max-width: 100%; 
            height: auto; 
        }

        .menu-toggle {
            display: none; 
            background-color: #007acc;
            color: white; 
            padding: 14px 16px; 
            cursor: pointer; 
            text-align: right; 
            z-index: 999; 
        }

        .menu-toggle span {
            font-size: 24px; 
        }

        ul.topnav {
            list-style-type: none; 
            margin: 0; 
            padding: 0; 
            overflow: hidden; 
            background-color: #007acc; 
            display: flex; 
            flex-wrap: wrap; 
        }

        ul.topnav li {
            float: right; 
        }

        ul.topnav li a {
            display: block; 
            color: white; 
            text-align: center; 
            padding: 14px 16px; 
            text-decoration: none; 
        }

        ul.topnav li a:hover:not(.active) {
            background-color: #004080; 
        }

        ul.topnav li a.active {
            background-color: #0059b3; 
        }

     
        .container {
            padding: 2rem; 
        }

        .product {
            display: flex;
            flex-wrap: wrap; 
            justify-content: space-around;
        }

        .product-item {
            background-color: #fff; 
            margin: 1rem; 
            border: 1px solid #ddd; 
            width: calc(33% - 4rem); 
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); 
            transition: transform 0.2s; 
            position: relative;
            cursor: pointer; 
            border-radius: 8px; 
        }

        .product-item:hover {
            transform: scale(1.05); 
        }

        .product-item a {
            display: block; 
            text-decoration: none; 
        }

        .product-item img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block; 
            border-radius: 8px 8px 0 0; 
        }

        .product-item .overlay {
            position: absolute; 
            top: 0;
            left: 0;
            width: 100%;
            height: 200px;
            opacity: 0; 
            transition: opacity 0.3s ease-in-out; 
        }

        .product-item:hover .overlay,
        .product-item.active .overlay {
            opacity: 1;
        }

        .product-item-content {
            padding: 1rem;
        }

        .product-item h3 {
            color: #004080; 
            margin: 0 0 0.5rem 0;
        }

        .product-item p {
            color: #666; 
            margin: 0 0 1rem 0;
        }

        .product-item a.more {
            display: inline-block; 
            padding: 0.5rem 1rem; 
            background-color: #007acc; 
            color: #fff; 
            text-decoration: none; 
            border-radius: 5px;
        }

        .product-item a.more:hover {
            background-color: #004080; 
        }

        

        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: center; 
            }

            .logo {
                margin: 1rem 0; 
            }

            .ad {
                margin: 1rem 0; 
            }

            .product-item {
                width: calc(80% - 2rem); 
                margin: 1rem auto; 
            }
        }

        @media (max-width: 600px) {
            .product-item {
                width: calc(100% - 2rem); 
                margin: 1rem auto;
            }

            .menu-toggle {
                display: block; 
            }

            ul.topnav {
                display: none; 
                flex-direction: column; 
                width: 100%;
            }

            ul.topnav.active {
                display: flex; 
            }

            ul.topnav li {
                float: none; 
                width: 100%; 
                text-align: left; 
            }
        }

  /* 导航容器 */
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #007acc;
            position: relative;
        }

        /* 移动端导航栏布局 */
        .mobile-nav {
            display: none;
        }

        /* 顶部导航栏 */
        ul.topnav {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: #007acc;
            display: flex;
            flex-grow: 1;
        }

        ul.topnav li {
            float: left;
        }

        ul.topnav li a {
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
        }

        ul.topnav li a:hover:not(.active) {
            background-color: #004080;
        }

        ul.topnav li a.active {
            background-color: #0059b3;
        }

        /* 响应式搜索框样式 */
        .search-box {
            padding: 8px;
            margin-left: auto;
            flex-shrink: 0;
            min-width: 150px;
            max-width: 300px;
            width: 100%;
        }

        .search-box form {
            display: flex;
            width: 100%;
        }

        .search-box input[type="text"] {
            flex: 1;
            min-width: 100px;
            padding: 6px 10px;
            border: none;
            border-radius: 4px 0 0 4px;
            outline: none;
            font-size: 14px;
        }

        .search-box button {
            padding: 6px 12px;
            background-color: #004080;
            color: white;
            border: none;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            white-space: nowrap;
        }

        .search-box button:hover {
            background-color: #0066cc;
        }

        /* 响应式布局 - 移动端 */
        @media (max-width: 768px) {            
            /* 移动端导航样式 */
            .nav-container {
                flex-wrap: wrap;
                padding: 0;
            }
            
            /* 隐藏桌面版搜索框 */
            .nav-container > .search-box {
                display: none;
            }
            
            .mobile-nav {
                display: flex;
                width: 100%;
                order: 1;
                align-items: center;
                justify-content: space-between;
                padding: 0 8px;
                background-color: #007acc;
                gap: 10px;
            }
            
            ul.topnav {
                display: none;
                flex-direction: column;
                width: 100%;
                order: 2;
            }
            
            ul.topnav.active {
                display: flex;
            }
            
            ul.topnav li {
                width: 100%;
                text-align: left;
            }
            
            .mobile-nav .search-box {
                flex-grow: 1;
                padding: 8px;
                margin-left: 0;
                min-width: auto;
            }
            
            /* 菜单切换按钮（移动端） */
            .menu-toggle {
                display: block;
                background-color: #007acc;
                color: white;
                padding: 14px 16px;
                cursor: pointer;
                z-index: 999;
                text-align: center;
                flex-shrink: 0;
            }

            .menu-toggle span {
                font-size: 24px;
            }
        }
        
        @media (max-width: 600px) {            
            .search-box {
                min-width: 120px;
            }
            
            .search-box button {
                padding: 6px 8px;
            }
        }
        
        @media (max-width: 400px) {
            .search-box input[type="text"] {
                min-width: 80px;
                padding: 6px 8px;
            }
            
            .search-box button {
                padding: 6px;
                font-size: 12px;
            }
        }

        /* 视频容器样式 */
        .container2 {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            width: 100%;
            box-sizing: border-box;
        }

        /* 大视频卡片样式 */
        .card2{
            background-color: #fff;
            margin: 10px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            transition: transform 0.2s;
            max-width: 700px;
            width: 100%;
        }

        .card2:hover {
            transform: scale(1.02);
        }

        .card2 a {
            text-decoration: none;
            color: black;
        }

        .card2 video {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .card2 {
                max-width: 90%;
            }
        }

        @media (max-width: 480px) {
            .card2 {
                max-width: 95%;
                margin: 5px;
            }
            
            .container2 {
                padding: 10px;
            }
        }

        /* 品牌官网导航样式 */
        ul.brand-index {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: #005090;
            position: sticky;
            top: 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        ul.brand-index li {
            float: left;
        }

        ul.brand-index li a {
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
            cursor: pointer;
        }

        ul.brand-index li a:hover {
            background-color: #ff6347;
        }

        .brand-active {
            background-color: #4CAF50;
        }

        .brand-container {
            max-width: 1200px;
            margin: 10px auto;
            padding: 1em;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .brand-section {
            width: 100%;
            margin-bottom: 2em;
        }

        .brand-section h1 {
            padding-left: 20px;
            color: #004080;
        }

        .brand-card {
            width: calc(16.666% - 24px);
            margin: 12px;
            background-color: #f3f3f3;
            border-radius: 7px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            transition: transform 0.3s ease;
        }

        .brand-card:hover {
            transform: translateY(-5px);
        }

        .brand-card img {
            width: 100%;
            height: auto;
            display: block;
        }

        .brand-card a {
            display: block;
            text-decoration: none;
        }

        .brand-card-content {
            padding: 15px;
            text-align: center;
        }

        .brand-card-content h3 {
            margin: 0;
            color: #333;
            font-size: 16px;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .brand-card {
                width: calc(20% - 24px);
            }
        }

        @media (max-width: 768px) {
            .brand-card {
                width: calc(25% - 24px);
            }
        }

        @media (max-width: 600px) {
            .brand-card {
                width: calc(33.333% - 24px);
            }
            
            ul.brand-index li a {
                padding: 10px 12px;
                font-size: 14px;
            }
        }

        @media (max-width: 480px) {
            .brand-card {
                width: calc(50% - 24px);
            }
            
            .brand-card-content h3 {
                font-size: 14px;
            }
        }

        /*小视频容器样式 */
        .container3 {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 20px;
        }

        /* 小视频卡片样式 */
        .card3 {
            background-color: #fff;
            margin: 10px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            transition: transform 0.2s;
            width: 320px;
        }

        .card3:hover {
            transform: scale(1.05);
        }

        .card3 a {
            text-decoration: none;
            color: black;
        }

        .card3 video {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 小视频卡片内容样式 */
        .card3-content {
            padding: 15px;
        }

        .card3-content h3 {
            margin: 0 0 10px 0;
            font-size: 20px;
        }

        .card3-content p {
            margin: 0;
            color: #666;
        }

        /* 通用卡片式产品导购样式 */
        .container6 {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 20px;
        }

        .card6 {
            background: #fff;
            border: 1px solid #ddd;
            border-radius: 8px;
            overflow: hidden;
            margin: 10px;
            width: 300px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s;
            position: relative;
        }

        .card6:hover {
            transform: translateY(-5px);
        }

        .card6 a {
            text-decoration: none;
            color: inherit;
            display: block;
            position: relative;
        }

        .card6 img {
            width: 100%;
            transition: opacity 0.3s;
        }

        .card6-content {
            padding: 15px;
        }

        .card6 h3 {
            margin: 0 0 10px;
        }

        .card6 p {
            color: #555;
        }

        .hover-img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            opacity: 0;
            transition: opacity 0.3s;
        }

        .card6:hover .hover-img {
            opacity: 1;
        }

        .card6:hover img:not(.hover-img) {
            opacity: 0;
        }
  /* 关于我们样式 */

 * {
            box-sizing: border-box;
        }

        video {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }

        img {
            width: 100%;
            height: auto;
        }
        
        .row:after {
            content: "";
            clear: both;
            display: table;
        }

        [class*="col-"] {
            float: left;
            padding: 15px;
            width: 100%;
        }

        @media only screen and (min-width: 600px) {
            .col-s-1 {width: 8.33%;}
            .col-s-2 {width: 16.66%;}
            .col-s-3 {width: 25%;}
            .col-s-4 {width: 33.33%;}
            .col-s-5 {width: 41.66%;}
            .col-s-6 {width: 50%;}
            .col-s-7 {width: 58.33%;}
            .col-s-8 {width: 66.66%;}
            .col-s-9 {width: 75%;}
            .col-s-10 {width: 83.33%;}
            .col-s-11 {width: 91.66%;}
            .col-s-12 {width: 100%;}
        }

        @media only screen and (min-width: 768px) {
            .col-1 {width: 8.33%;}
            .col-2 {width: 16.66%;}
            .col-3 {width: 25%;}
            .col-4 {width: 33.33%;}
            .col-5 {width: 41.66%;}
            .col-6 {width: 50%;}
            .col-7 {width: 58.33%;}
            .col-8 {width: 66.66%;}
            .col-9 {width: 75%;}
            .col-10 {width: 83.33%;}
            .col-11 {width: 91.66%;}
            .col-12 {width: 100%;}
        }

        .menu ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
        }

        .menu li {
            border-radius: 5px;
            padding: 8px;
            margin-bottom: 7px;
            background-color: #007acc;
            color: #ffffff;
            box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
        }

        .menu li a {
            color: white;
            display: block;
            text-decoration: none;
            cursor: pointer;
        }
        
        .menu li a.active {
            color: white;
        }

        .menu li:hover {
            background-color: #004080;
        }

        .aside {
            border-radius: 8px;
            background-color: #007acc;
            padding: 15px;
            color: #ffffff;
            text-align: center;
            font-size: 14px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
        }
        /*通用分页样式 */
        .fenyecenter {
            text-align: center;
            margin: 20px 0;
        }
        
        .fenye {
            display: inline-block;
            padding: 10px;
        }

        .fenye a {
            color: black;
            float: left;
            padding: 8px 16px;
            text-decoration: none;
            transition: background-color .3s;
            border: 1px solid #ddd;
            margin: 0 5px;
            border-radius: 4px;
        }
        
        .fenye a.active {
            background-color: #007acc;
            color: white;
            border: 1px solid #007acc;
        }
        
        .fenye a:hover:not(.active) {
            background-color: #ddd;
        }
/*底部通用样式 */
       .footer {
            text-align: center; 
            padding: 1px; 
            background-color: #007acc;
            color: #fff; 
        }