:root {
          --primary-color: #338be9;
          --secondary-color: #003d82;
          --accent-color: #ff6b00;
          --light-color: #f8f9fa;
          --dark-color: #343a40;
          --text-color: #333;
          --text-light: #fff;
          --transition: all 0.3s ease;
        }

        * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
          font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
          color: var(--text-color);
          line-height: 1.6;
          overflow-x: hidden;
          position: relative;
        }

        html,
        body {
          width: 100%;
          overflow-x: hidden;
          -webkit-overflow-scrolling: touch;
        }

        /* 导航栏样式 */
        .navbar {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding: 1rem 5%;
          background-color: var(--text-light);
          position: fixed;
          width: 100%;
          top: 0;
          z-index: 1000;
          box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .logo {
          font-size: 1.8rem;
          font-weight: 700;
          color: var(--text-light);
        }

        .logo>img {
          width: 400px;
          height: 120px;
          scale: 0.8;
          border-bottom: 10px solid #fff;
        }

        .logo span {
          color: var(--accent-color);
        }

        .nav-links {
          display: flex;
          list-style: none;
        }

        .nav-links li {
          margin: 0 1rem;
          color: var(--text-light);
        }

        .nav-links a {
          text-decoration: none;
          color: var(--text-color);
          font-weight: 500;
          transition: var(--transition);
          padding: 0.5rem 1rem;
          border-radius: 4px;
        }

        .nav-links a:hover {
          color: #fff;
          background-color: var(--primary-color);
        }

        /* 自定义下拉框样式 */
        .lang-select {
          border: 1px solid #ccc;
          padding-right: 20px;
          padding: 0.5rem 20px;
          font-size: 1rem;
          border-radius: 4px;
          background-size: 12px auto;
          cursor: pointer;
        }

        .lang-select:focus {
          outline: none;
          background-color: #fff;
        }

        .language-switcher {
          display: flex;
          margin-left: 1rem;
        }

        .lang-btn {
          background: none;
          border: none;
          color: var(--text-light);
          cursor: pointer;
          padding: 0.5rem;
          font-weight: 500;
          transition: var(--transition);
          opacity: 0.7;
        }

        .lang-btn.active {
          opacity: 1;
          text-decoration: underline;
          text-underline-offset: 4px;
        }

        /* 轮播样式 */
        .hero {
          position: relative;
          width: 100%;
          height: 100vh;
          overflow: hidden;
        }

        .swiper-container {
          width: 100%;
          height: 100%;
          position: absolute;
          top: 0;
          left: 0;
          z-index: 0;
        }

        .swiper-slide {
          background-size: cover;
          /* 图片自适应 */
          background-position: bottom bottom;
          /* 确保裁剪时居中 */
          /* 居中显示 */
          width: 100%;
          height: 100%;
        }

        .hero-content {
          position: relative;
          z-index: 1;
          color: white;
          text-align: center;
          padding-top: 20%;
        }

        /* 移动端适配样式 */
        @media (max-width: 768px) {
          .logo>img {
            width: 100%;
            height: 120px;
            scale: 0.7;
            padding: 10px;
          }

          .hero {
            height: auto;
            margin-top: 160px;
            min-height: 40vh;
          }

          .swiper-container {
            height: 40vh;
          }

          .hero-content {
            padding-top: 15%;
            font-size: 0.9rem;
          }

          .swiper-slide .slide-text-container > p{
            font-size: 22px !important;
            bottom: 20%;
            left: 5%;
            color: #fff;
            font-weight: bolder;
          }

          .cta-button {
            padding: 8px 16px;
            font-size: 0.9rem;
          }
        }

        .cta-button {
          display: inline-block;
          margin-top: 20px;
          padding: 10px 20px;
          background-color: #007BFF;
          color: white;
          text-decoration: none;
          border-radius: 5px;
        }

        .cta-button:hover {
          background-color: #e55e00;
          transform: translateY(-3px);
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

        /* 服务轮播 */
        .services {
          padding: 5rem 5%;
          background-color: var(--light-color);
        }

        .section-title {
          text-align: center;
          margin-bottom: 3rem;
          position: relative;
        }

        .section-title::after {
          content: '';
          position: absolute;
          bottom: -10px;
          left: 50%;
          transform: translateX(-50%);
          width: 80px;
          height: 4px;
          background-color: var(--accent-color);
        }

        .services-container {
          display: flex;
          justify-content: center;
          flex-wrap: wrap;
          gap: 2rem;
        }

        .service-card {
          background: white;
          border-radius: 10px;
          overflow: hidden;
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
          width: 300px;
          transition: var(--transition);
        }

        .service-card:hover {
          transform: translateY(-10px);
          box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .service-img {
          position: relative;
          height: 200px;
          overflow: hidden;
        }

        .service-img img {
          width: 100%;
          height: 100%;
          object-fit: cover;
          transition: var(--transition);
        }

        .service-img>.play-button {
          position: absolute;
          top: 40%;
          /* 距离顶部的距离 */
          right: 40%;
          /* 距离右侧的距离 */
          width: 4rem;
          /* 播放按钮的宽度 */
          height: 4rem;
          /* 播放按钮的高度 */
          cursor: pointer;
          /* 鼠标悬停时显示为指针 */
          opacity: 0.35;
          /* 半透明效果 */
          filter: brightness(90%);
          /* 如果背景较暗，可以增加亮度 */
        }

        .service-img>.play-button:hover,
        .service-img>.play-button:focus {
          opacity: 1;
          /* 鼠标悬停或聚焦时完全不透明 */
        }

        .service-card:hover .service-img img {
          transform: scale(1.1);
        }

        .service-content {
          padding: 1.5rem;
        }

        .service-content h3 {
          margin-bottom: 0.5rem;
          color: var(--primary-color);
        }

        /* 客户案例 */
        .clients {
          width: 100%;
          margin: 0 auto;
          padding: 5rem 5%;
          background-color: white;
          overflow-x: hidden;
        }

        .client-logos {
          display: flex;
          margin: auto;
          gap: 40px;
          white-space: nowrap;
          will-change: transform;
          /* 提升性能 */
        }

        .client-logo {
          flex-shrink: 0;
          line-height: 5rem;
          padding: 0 20px;
          font-size: 1.2rem;
          color: #333;
        }

        .client-logo>img {
          width: 200px;
          height: 120px;
          margin-bottom: 20px;
          padding: 20px;
        }


        /* 团队展示 */
        .team {
          padding: 5rem 5%;
          background-color: var(--light-color);
        }

        .team-members {
          display: flex;
          justify-content: center;
          flex-wrap: wrap;
          gap: 2rem;
        }

        .team-member {
          background: white;
          border-radius: 10px;
          overflow: hidden;
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
          width: 300px;
          text-align: center;
          transition: var(--transition);
        }

        .team-member:hover {
          transform: translateY(-10px);
        }

        .member-photo {
          overflow: hidden;
        }

        .member-photo img {
          width: 100%;
          height: 300px;
          scale: 0.8;
          border-radius: 20px;
          box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.3);
          object-fit: cover;
        }

        .member-info {
          padding: 0 1.5rem 1.5rem 1.5rem;
        }

        .member-info h3 {
          margin-bottom: 0.5rem;
          color: var(--primary-color);
        }

        .member-info p {
          color: var(--dark-color);
          font-style: oblique;
          color: #000;
          margin-top: 1rem;
        }

        /* 关于我们 */
        .about>.section-title {
          margin: 30px 0;
        }

        .container {
          width: 100%;
          max-width: 1200px;
          margin: 0 auto;
        }

        .about-content {
          display: flex;
          justify-content: space-around;
          /* 文字顶部对齐 */
          gap: 40px;
          /* 左右区域间距 */
          flex-wrap: wrap;
          /* 允许在小屏幕上换行 */
        }

        .text-section,
        .image-section {
          flex: 1 1 40%;
          /* 默认各占 45% 宽度，留出间隙 */
        }


        /* 图片区域样式 */
        .image-section img {
          width: 100%;
          height: auto;
          object-fit: cover;
          border-radius: 8px;
        }

        .about-content {
          display: flex;
          gap: 40px;
          /* 左右间距 */
          margin-top: 60px;
        }

        .text-section {
          flex: 1 1 45%;
          /* 占据 45% 宽度 */
          display: flex;
          flex-direction: column;
          justify-content: center;
          font-size: 1.2rem;
          font-style: italic;
        }

        .btn-more {
          width: 10rem;
          text-align: center;
          align-self: flex-start;
          margin: 40px 0 20px 0;
          padding: 10px 40px;
          background-color: #007BFF;
          color: white;
          text-decoration: none;
          border-radius: 30px;
          font-size: 16px;
          transition: background-color 0.3s ease;
        }

        .btn-more:hover {
          background-color: #0056b3;
        }

        /* 移动端适配：堆叠成一列 */
        @media (max-width: 768px) {
          .about-content {
            flex-direction: column;
            gap: 20px;
          }

          .image-section {
            top: 0;
            height: auto;
            margin-top: -20px;
          }
        }

        /* 联系我们 */
        .contact {
          padding: 5rem 5%;
          background-color: white;
        }


        .contact-form {
          width: 800px;
          margin: 0 auto;
          display: flex;
          flex-direction: column;
          gap: 1rem;
        }

        .form-group {
          display: flex;
          flex-direction: column;
        }

        .form-group label {
          margin-bottom: 0.5rem;
          font-weight: 500;
        }

        .form-group input,
        .form-group textarea {
          padding: 0.8rem;
          border: 1px solid #ddd;
          border-radius: 4px;
          font-size: 1rem;
        }

        .form-group textarea {
          min-height: 150px;
          resize: vertical;
        }

        .submit-btn {
          background-color: var(--primary-color);
          color: white;
          border: none;
          padding: 1rem;
          border-radius: 4px;
          cursor: pointer;
          font-weight: 600;
          transition: var(--transition);
        }

        .submit-btn:hover {
          background-color: var(--secondary-color);
        }

        /* 页脚 */
        footer {
          background-color: #f8f8f8;
          padding: 4rem 2rem;
          color: #333;
        }

        .footer-content {
          display: flex;
          justify-content: space-between;
          flex-wrap: wrap;
          gap: 2rem;
        }

        .footer-section {
          flex: 1;
          min-width: 250px;
          padding: 1rem;
          box-sizing: border-box;
        }

        .footer-section h3 {
          margin-bottom: 1rem;
          font-size: 1.2rem;
          color: #003366;
        }

        .footer-section ul {
          list-style: none;
          padding-left: 0;
        }

        .footer-section ul li a {
          text-decoration: none;
          color: #333;
          transition: color 0.3s ease;
        }

        .footer-section ul li a:hover {
          color: #007BFF;
        }

        .footer-bottom {
          margin-top: 2rem;
          text-align: center;
          font-size: 0.9rem;
          color: #666;
        }

        /* 回到顶部按钮样式 */
        #backToTop {
          position: fixed;
          bottom: 30px;
          right: 30px;
          width: 40px;
          height: 40px;
          background-color: #007BFF;
          color: white;
          border: none;
          border-radius: 50%;
          cursor: pointer;
          font-size: 1.2rem;
          display: none;
          align-items: center;
          justify-content: center;
          z-index: 999;
          transition: opacity 0.3s ease;
        }

        #backToTop:hover {
          background-color: #0056b3;
        }

        /* 足迹图库样式 */
        .development-history {
          width: 100%;
          padding: 80px 0;
          background-color: var(--light-color);
        }

        #history-content {
          white-space: pre-wrap;
          /* 自动识别 \n 并换行 */
          height: auto;
        }

        .footprint-gallery {
          display: flex;
          flex-wrap: wrap;
          gap: 2rem;
        }

        .gallery-item,
        .gallery-description {
          flex: 1;
          min-width: 300px;
        }

        .gallery-description>p {
          padding: 20px;
          text-align: center;
          font-size: 1.2rem;
          font-weight: bold;
          background-color: #fff;
          border-radius: 20px;
        }

        .gallery-item img {
          width: 100%;
          height: auto;
          display: block;
          transition: transform 0.5s ease;
        }

        .gallery-item:hover img {
          transform: scale(1.08);
        }

        /* 数据展示区域 */
        .data-highlight {
          width: 100%;
          background: url('https://img2.baidu.com/it/u=1328664381,2640317922&fm=253&fmt=auto&app=138&f=JPEG?w=750&h=500') no-repeat center center;
          background-size: cover;
          color: white;
          padding: 4rem 0;
          text-align: center;
        }

        .data-highlight .container {
          display: flex;
          justify-content: space-around;
          align-items: center;
        }

        .data-item {
          flex: 1;
          padding: 0 2rem;
        }

        .data-item h2 {
          font-size: 3rem;
          margin-bottom: 0.5rem;
        }

        .data-item p {
          font-size: 1.2rem;
          color: #ccc;
        }

        /*  尾部*/
        .overlay {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          background: rgba(0, 0, 51, 0.6);
          /* 深色滤镜 */
          color: white;
          opacity: 0;
          transition: opacity 0.3s ease;
          display: flex;
          align-items: center;
          justify-content: center;
          text-align: center;
          padding: 1rem;
          box-sizing: border-box;
        }

        .gallery-item:hover .overlay {
          opacity: 1;
        }

        /* 页脚样式更新 */
        footer.overlay-bg {
          background-color: #000;
          color: white;
          padding: 4rem 2rem;
        }

        .footer-content {
          display: flex;
          justify-content: center;
          flex-wrap: wrap;
          gap: 2rem;
          text-align: center;
        }

        .footer-section {
          flex: 1;
          min-width: 250px;
          padding: 1rem;
          box-sizing: border-box;
        }

        .footer-section h3 {
          margin-bottom: 1rem;
          font-size: 1.2rem;
          color: #007BFF;
        }

        .footer-section p,
        .footer-section a {
          color: #ccc;
          font-size: 0.95rem;
          line-height: 1.6;
        }

        .footer-section ul {
          list-style: none;
          padding-left: 0;
        }

        .footer-section ul li a {
          text-decoration: none;
          color: #ccc;
          transition: color 0.3s ease;
        }

        .footer-section ul li a:hover {
          color: #007BFF;
        }

        .footer-bottom {
          width: 100%;
          margin-top: 2rem;
          text-align: center;
          font-size: 0.9rem;
          color: var(--light-color);
          border-top: 1px solid #444;
          padding-top: 1rem;
        }

        @media (max-width: 768px) {
          .gallery-item {
            flex: 1 1 100%;
          }
        }


        /* 移动端适配 */
        @media (max-width: 768px) {
          .client-logos {
            flex-wrap: wrap;
            /* 允许换行 */
            justify-content: center;
            /* 居中对齐 */
            overflow-x: hidden;
            /* 防止溢出 */
          }

          .client-logo {
            flex: 0 0 calc(33% - 25px);
            /* 每行最多放3个，适应gap和padding */
            max-width: 33%;
            /* 限制最大宽度 */
            text-align: center;
          }

          .client-logo img {
            padding: 0;
            width: 100%;
            height: 5rem;
            object-fit: contain;
          }

          .footer-content {
            flex-direction: column;
          }

          .footer-section {
            min-width: 100%;
          }

          .footprint-gallery {
            flex-direction: column;
            align-items: flex-start;
          }


          .data-highlight .container {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 0 1rem;
          }

          .data-item {
            flex: 1 1 100%;
            max-width: 100%;
            text-align: center;
            margin: 1rem 0;
          }

          .data-item h2 {
            font-size: 2.2rem;
          }

          .data-item p {
            font-size: 1rem;
            word-break: break-word;
          }
        }

        /* 汉堡菜单样式 */
        .hamburger {
          width: 30px;
          height: 24px;
          position: relative;
          cursor: pointer;
          display: none;
          flex-direction: column;
          justify-content: space-between;
        }

        .hamburger-line {
          width: 100%;
          height: 3px;
          background-color: var(--primary-color);
          border-radius: 2px;
          transition: all 0.3s ease;
        }

        /* 菜单打开时的动画样式 */
        .hamburger.active .hamburger-line:nth-child(1) {
          transform: rotate(45deg) translate(5px, 5px);
        }

        .hamburger.active .hamburger-line:nth-child(2) {
          opacity: 0;
        }

        .hamburger.active .hamburger-line:nth-child(3) {
          transform: rotate(-45deg) translate(10px, -10px);
        }

        /* 侧滑菜单样式 */
        .sidebar {
          position: fixed;
          left: -50%;
          top: 0;
          height: 100%;
          width: 50%;
          background-color: var(--secondary-color);
          padding: 2rem 1rem;
          flex-direction: column;
          align-items: center;
          z-index: 999;
          overflow-y: auto;
          transition: left 0.3s ease;
        }

        /* 侧边栏 Logo 样式 */
        .sidebar-logo {
          display: flex;
          justify-content: center;
          align-items: center;
          padding: 1rem 0;
          margin-bottom: 1rem;
          border-bottom: 1px solid rgba(255, 255, 255, 0.2);
        }

        .sidebar-logo img {
          width: 100%;
          /* 根据你的 Logo 大小调整 */
          height: auto;
          width: 100%;
          height: auto;
          background-color: #fff;
          border-radius: 5px;
          padding: 10px;
        }

        .sidebar.open {
          left: 0;
        }

        .sidebar-links {
          list-style: none;
          text-align: center;
          margin-top: 2rem;
          width: 100%;
        }

        .sidebar-links li {
          margin: 1rem 0;
        }

        .sidebar-links a {
          text-decoration: none;
          color: var(--text-light);
          font-weight: 500;
          transition: var(--transition);
          padding: 0.5rem 1rem;
          border-radius: 4px;
          display: block;
          width: 100%;
        }

        .sidebar-links a:hover {
          background-color: rgba(255, 255, 255, 0.1);
        }

        .sidebar-overlay {
          position: fixed;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          background-color: transparent;
          z-index: 998;
          display: none;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
          .client {
            display: flex;
            flex-wrap: nowrap;
            /* 强制不换行 */
            overflow-x: auto;
            /* 允许水平滚动 */
            -webkit-overflow-scrolling: touch;
            /* 流畅滑动体验 */
            scrollbar-width: none;
            /* 隐藏滚动条（可选） */
          }

          .client-logos {
            flex-wrap: wrap;
            justify-content: center;
            overflow-x: hidden;
            padding: 0 1rem;
          }

          .client-logo {
            flex: 0 0 calc(33.333% - 10px);
            max-width: 33.333%;
            padding: 0 5px;
          }

          .client-logo img {
            width: 100%;
            height: auto;
          }

          .client::-webkit-scrollbar {
            display: none;
          }

          .about,
          .contact {
            padding: 3rem 3%;
          }

          .contact-form {
            width: 100%;
          }

          /* 移动端显示汉堡菜单 */
          .navbar {
            flex-direction: row;
            justify-content: space-between;
          }

          .hamburger {
            display: flex;
          }

          .sidebar.open~.sidebar-overlay {
            display: block;
          }

          .nav-links {
            display: none;
            flex-direction: column;
            width: 100%;
            text-align: center;
            margin-top: 1rem;
          }

          .language-switcher {
            display: none;
          }

          /* 在移动设备上调整其他部分 */
          .hero h1 {
            font-size: 2.5rem;
          }

          .hero p {
            font-size: 1rem;
          }

          .service-card,
          .team-member {
            width: 100%;
            max-width: 350px;
          }

          .service-img img[loading="lazy"],
          .member-photo img[loading="lazy"],
          .gallery-item img[loading="lazy"] {
            opacity: 1;
          }

        }