/* 1. 基本重置和全局样式 */
        :root {
            --lihang-blue: #004a99;
            --lihang-light-blue: #007bff;
            --text-light: #f0f0f0;
            --text-dark: #333;
            --bg-dark-primary: #0a0f1a;
            --bg-dark-secondary: #1a2035;
        }

        html,
        body {
            margin: 0;
            padding: 0;
            height: 100%;
            width: 100%;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
            background-color: var(--bg-dark-primary);
            color: var(--text-light);
            overflow: hidden;
            /* Swiper 会处理滚动 */
        }

        .back-img {
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        /* 2. Flexbox 工具类 (来自原始HTML) */
        .flex {
            display: flex;
        }

        .flex-jc-sb {
            justify-content: space-between;
        }

        .flex-ai-c {
            align-items: center;
        }

        .flex-zd {
            /* 原始类名，可能是 z-direction 或 flex-direction, 这里设为 row */
            flex-direction: row;
        }

        /* 3. 头部导航 */
        .main-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 1.25rem 2.5rem;
            /* 20px 40px */
            z-index: 100;
            background: rgba(10, 15, 26, 0.5);
            backdrop-filter: blur(5px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            box-sizing: border-box;
            /* 确保 padding 不会撑开宽度 */
            display: flex;
            /* 新增：使 logo 和菜单在同一行 */
        }

        .main-header .logo {
            height: 40px;
            /* 原始 40px */
            width: auto;
            cursor: pointer;
            border-radius: 4px;
        }

        .main-header .nav-links {
            display: flex;
            /* 确保 flex 属性被应用 */
            gap: 2.5rem;
            /* 40px */
        }

        .main-header .nav-item {
            font-size: 1rem;
            /* 16px */
            color: var(--text-light);
            text-decoration: none;
            cursor: pointer;
            position: relative;
            padding-bottom: 0.5rem;
            /* 8px */
            transition: color 0.3s ease;
        }

        .main-header .nav-item:hover {
            color: var(--lihang-light-blue);
        }

        .main-header .nav-item::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background-color: var(--lihang-light-blue);
            transition: width 0.3s ease;
        }

        .main-header .nav-item:hover::after,
        .main-header .nav-item.active::after {
            width: 100%;
        }

        /* 4. Swiper 容器 */
        .swiper-container {
            width: 100%;
            height: 100vh;
        }

        .swiper-slide {
            width: 100%;
            height: 100vh;
            overflow: hidden;
            position: relative;
        }

        /* 5. 底部备案信息 (通用) */
        .footer-beian {
            position: absolute;
            bottom: 1.25rem;
            /* 20px */
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            font-size: 0.75rem;
            /* 12px */
            color: #ccc;
            white-space: nowrap;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
        }

        .footer-beian a {
            color: #ccc;
            text-decoration: none;
        }

        .footer-beian a:hover {
            text-decoration: underline;
        }

        .footer-beian img {
            height: 0.75rem;
            /* 12px */
            vertical-align: middle;
        }

        /* 新增：为第5页的 footer 增加背景色 */
        .page-slide-5 .footer-beian {
            background-color: rgba(0, 0, 0, 0.6);
            padding: 0.5rem 1.5rem;
            /* 8px 24px */
            border-radius: 8px;
            color: #f0f0f0;
            /* 调亮文字颜色 */
            text-shadow: none;
            /* 移除文字阴影 */
        }

        .page-slide-5 .footer-beian a {
            color: #f0f0f0;
            /* 调亮链接颜色 */
        }


        /* 6. 幻灯片 1: 首页 */
        .page-slide-1 #bgVideo {
            position: absolute;
            top: 50%;
            left: 50%;
            min-width: 100%;
            min-height: 100%;
            width: auto;
            height: auto;
            z-index: -1;
            transform: translate(-50%, -50%);
            background-color: #000;
        }

        .page-slide-1 .home-links {
            position: absolute;
            bottom: 100px;
            /* 原始 80px + 20px beian */
            left: 50%;
            transform: translateX(-50%);

            /* 新增：使其水平展开 */
            display: flex;
            justify-content: space-around;
            /* 均匀分布 */
            width: 80%;
            /* 占据 80% 宽度 */
            max-width: 1200px;
            /* 最大宽度 */
            gap: 1.25rem;
            /* 20px */
        }

        .page-slide-1 .scale-border {
            border: 1px solid rgba(255, 255, 255, 0.3);
            padding: 0.3125rem;
            /* 5px */
            border-radius: 8px;
            cursor: pointer;
            transition: transform 0.3s ease, border-color 0.3s ease;
            background: rgba(0, 0, 0, 0.2);
            backdrop-filter: blur(3px);
        }

        .page-slide-1 .scale-border:hover {
            transform: scale(1.05);
            border-color: var(--lihang-light-blue);
        }

        .page-slide-1 .home-thumb-item {
            width: 12.5rem;
            /* 200px */
            height: 6.25rem;
            /* 100px */
            border-radius: 4px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .page-slide-1 .home-font-style {
            font-size: 1.125rem;
            /* 18px */
            font-weight: bold;
            color: #fff;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
        }

        /* 7. 幻灯片 2: 关于我们 */
        .page-slide-2 {
            background-image: url('/images/1.avif');
            overflow-y: auto;
            /* 允许此幻灯片内容滚动 */
            padding: 6.25rem 5%;
            /* 100px */
            box-sizing: border-box;
        }

        /* 新增：关于我们页面的左右布局容器 */
        .about-layout-container {
            display: flex;
            gap: 2.5rem;
            /* 40px */
            max-width: 1600px;
            margin: 0 auto;
            align-items: flex-start;
        }

        .timeline-column {
            flex: 1;
            min-width: 400px;
            /* 最小宽度 */
        }

        .profile-column {
            flex: 1.5;
            /* 公司信息栏更宽 */
            min-width: 500px;
        }

        .timeline-title {
            font-size: 2rem;
            /* 32px */
            text-align: center;
            margin-bottom: 2.5rem;
            /* 40px */
            letter-spacing: 0.5rem;
            color: var(--text-light);
        }

        /* 发展历程 - 调整为左侧时间线 */
        .timeline-container {
            position: relative;
            padding: 1rem 0;
            /* 移除 max-width 和 margin auto */
        }

        .timeline-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 10px;
            /* 调整到左侧 */
            transform: translateX(-50%);
            width: 3px;
            height: 100%;
            background-color: rgba(255, 255, 255, 0.2);
        }

        .timeline-point {
            position: relative;
            width: 100%;
            /* 占满左侧栏 */
            box-sizing: border-box;
            margin-bottom: 2rem;
            /* 32px */
            left: 0;
            /* 移除 left 50% */
            padding-left: 3rem;
            /* 48px, 为圆点留出空间 */
            text-align: left;
            /* 全部左对齐 */
        }

        /* 移除 :nth-child 差异化样式 */
        .timeline-point:nth-child(odd) {
            left: 0;
            padding-right: 0;
            text-align: left;
        }

        .timeline-point:nth-child(even) {
            left: 0;
            padding-left: 3rem;
            /* 48px */
            text-align: left;
        }

        .timeline-point::after {
            /* The dot on the timeline */
            content: '';
            position: absolute;
            top: 0.3rem;
            width: 1rem;
            /* 16px */
            height: 1rem;
            /* 16px */
            border-radius: 50%;
            background-color: var(--lihang-light-blue);
            border: 3px solid var(--text-light);
            left: 10px;
            /* 调整到左侧 */
            transform: translateX(-50%);
            /* 居中 */
        }

        /* 移除 :nth-child 差异化样式 */
        .timeline-point:nth-child(odd)::after {
            right: auto;
            left: 10px;
            transform: translateX(-50%);
        }

        .timeline-point:nth-child(even)::after {
            left: 10px;
            transform: translateX(-50%);
        }

        .timeline-point span {
            font-size: 1.25rem;
            /* 20px */
            font-weight: bold;
            color: var(--lihang-light-blue);
            display: block;
        }

        .timeline-point .timeline-title-text {
            font-size: 1.1rem;
            /* 18px */
            color: var(--text-light);
            margin: 0.5rem 0;
        }

        .timeline-point .timeline-remark {
            font-size: 0.875rem;
            /* 14px */
            color: #ccc;
            line-height: 1.5;
        }

        /* 公司简介 */
        .company-profile-section {
            background: rgba(26, 32, 53, 0.7);
            border-radius: 12px;
            padding: 2rem;
            /* 32px */
            margin: 0;
            /* 移除 margin auto */
            backdrop-filter: blur(5px);
        }

        .profile-top {
            display: flex;
            gap: 2rem;
            /* 32px */
            margin-bottom: 2rem;
            /* 32px */
        }

        .profile-left {
            flex: 2;
        }

        .profile-left-title {
            font-size: 1.75rem;
            /* 28px */
            color: var(--lihang-light-blue);
            margin-bottom: 1rem;
            /* 16px */
            border-left: 4px solid var(--lihang-light-blue);
            padding-left: 0.75rem;
            /* 12px */
        }

        .profile-left-content {
            font-size: 0.9rem;
            /* 14.4px */
            line-height: 1.7;
            color: #ddd;
            margin-bottom: 1rem;
            /* 16px */
        }

        .profile-right {
            flex: 1.5;
        }

        .right-profile-top {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            /* 16px */
            margin-bottom: 1.5rem;
            /* 24px */
        }

        .profile-info-box {
            background: var(--bg-dark-primary);
            border-radius: 8px;
            padding: 1rem;
            /* 16px */
            display: flex;
            align-items: center;
            gap: 0.75rem;
            /* 12px */
            cursor: pointer;
            transition: transform 0.3s ease;
        }

        .profile-info-box:hover {
            transform: translateY(-5px);
        }

        .profile-info-box img {
            width: 40px;
            height: 40px;
        }

        .profile-info-box .info-title {
            font-size: 1.25rem;
            /* 20px */
            font-weight: bold;
        }

        .profile-info-box div:last-child {
            font-size: 0.875rem;
            /* 14px */
            color: #ccc;
        }

        .right-profile-bottom {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            /* 16px */
        }

        .right-profile-item {
            background: var(--bg-dark-primary);
            border-radius: 8px;
            padding: 1rem;
            /* 16px */
        }

        .right-profile-item .item-title {
            font-size: 1rem;
            /* 16px */
            font-weight: bold;
            color: var(--lihang-light-blue);
            margin-bottom: 0.5rem;
            /* 8px */
        }

        .right-profile-item div {
            font-size: 0.875rem;
            /* 14px */
            color: #ccc;
            line-height: 1.5;
        }

        /* 荣誉资质 */
        .profile-bottom {
            display: flex;
            gap: 2rem;
            /* 32px */
            margin-top: 2rem;
            /* 与 profile-top 分开 */
        }

        .profile-bottom .profile-half {
            flex: 1;
        }

        .profile-bottom .profile-title {
            font-size: 1.5rem;
            /* 24px */
            color: var(--text-light);
            margin-bottom: 1rem;
            /* 16px */
            border-bottom: 2px solid var(--lihang-light-blue);
            padding-bottom: 0.5rem;
            /* 8px */
        }

        .profile-bottom-content {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1rem;
            /* 8px 16px */
        }

        .profile-bottom-content .info {
            font-size: 0.875rem;
            /* 14px */
            color: #ccc;
            background: var(--bg-dark-primary);
            padding: 0.3rem 0.6rem;
            /* 5px 10px */
            border-radius: 4px;
            white-space: nowrap;
        }

        /* 8. 幻灯片 3: 客户价值 */
        .page-slide-3 {
            background-image: url('/images/2.avif');
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem;
            /* 32px */
            box-sizing: border-box;
        }

        .client-value-section {
            text-align: center;
            background: rgba(10, 15, 26, 0.7);
            padding: 3rem;
            /* 48px */
            border-radius: 12px;
            backdrop-filter: blur(5px);
            max-width: 900px;
        }

        .client-title {
            font-size: 2.25rem;
            /* 36px */
            color: var(--lihang-light-blue);
            margin-bottom: 1.5rem;
            /* 24px */
        }

        .client-content {
            font-size: 1.125rem;
            /* 18px */
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 2.5rem;
            /* 40px */
        }

        .partner-img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }

        /* 9. 幻灯片 4: 员工价值 */
        .page-slide-4 {
            background-image: url('/images/3.jpeg');
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 2rem;
            /* 32px */
            box-sizing: border-box;
        }

        .benefits-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            /* 24px */
            margin-bottom: 3rem;
            /* 48px */
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }

        .benefit-card {
            background: rgba(26, 32, 53, 0.8);
            border-radius: 12px;
            padding: 1.5rem;
            /* 24px */
            width: auto;
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .card-header {
            display: flex;
            align-items: center;
            gap: 1rem;
            /* 16px */
            margin-bottom: 1.5rem;
            /* 24px */
        }

        .card-header .title-img {
            width: 48px;
            height: 48px;
        }

        .card-header .list-title {
            font-size: 1.5rem;
            /* 24px */
            font-weight: bold;
            color: var(--text-light);
        }

        .benefits-list {
            list-style-type: none;
            padding-left: 0;
            margin: 0;
        }

        .benefits-list li {
            font-size: 1rem;
            /* 16px */
            color: #ccc;
            margin-bottom: 0.75rem;
            /* 12px */
            position: relative;
            padding-left: 1.5rem;
            /* 24px */
        }

        .benefits-list li::before {
            content: '✔';
            color: var(--lihang-light-blue);
            position: absolute;
            left: 0;
            top: 0;
        }

        .join-us-btn {
            font-size: 1.125rem;
            /* 18px */
            font-weight: bold;
            color: #fff;
            background-color: var(--lihang-light-blue);
            padding: 1rem 2.5rem;
            /* 16px 40px */
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
        }

        .join-us-btn:hover {
            background-color: #0056b3;
            box-shadow: 0 6px 20px rgba(0, 123, 255, 0.6);
            transform: translateY(-2px);
        }

        /* 10. 幻灯片 5: 联系我们 */
        .page-slide-5 {
            background-image: url('/images/4.avif');
            display: flex;
            justify-content: space-around;
            align-items: center;
            padding: 6.25rem 5%;
            /* 100px */
            box-sizing: border-box;
            gap: 2rem;
            /* 32px */
        }

        .contact-info {
            background: rgba(26, 32, 53, 0.8);
            border-radius: 12px;
            padding: 2.5rem;
            /* 40px */
            backdrop-filter: blur(5px);
            flex: 1;
            max-width: 600px;
        }

        .contact-info .contact-title {
            width: 10rem;
            /* 160px */
            height: auto;
            margin-bottom: 2rem;
            /* 32px */
        }

        .contact-info p {
            font-size: 1.125rem;
            /* 18px */
            margin-bottom: 1.5rem;
            /* 24px */
            letter-spacing: 0.1rem;
            color: #eee;
            line-height: 1.6;
        }

        .qr-code-area {
            display: flex;
            gap: 2rem;
            /* 32px */
            margin-top: 2rem;
            /* 32px */
        }

        .qr-code-item {
            text-align: center;
        }

        .qr-code-item .qr-img {
            width: 120px;
            height: 120px;
            border-radius: 8px;
            background: #fff;
            padding: 5px;
            margin-bottom: 0.5rem;
            /* 8px */
        }

        .qr-code-item p {
            font-size: 0.875rem;
            /* 14px */
            color: #ccc;
            margin: 0;
            letter-spacing: 0.1rem;
        }

        .office-locator {
            background: rgba(26, 32, 53, 0.8);
            border-radius: 12px;
            padding: 2rem;
            /* 32px */
            backdrop-filter: blur(5px);
            flex: 1;
            max-width: 500px;
            height: 500px;
            /* 固定高度以容纳列表 */
        }

        .office-tabs {
            display: flex;
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            margin-bottom: 1.5rem;
            /* 24px */
        }

        .office-tabs .tab-item {
            font-size: 1.125rem;
            /* 18px */
            padding: 0.75rem 1.5rem;
            /* 12px 24px */
            cursor: pointer;
            color: #ccc;
            position: relative;
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }

        .office-tabs .tab-item.active {
            color: #fff;
            border-bottom-color: var(--lihang-light-blue);
        }

        .office-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: none;
            /* 默认隐藏 */
            height: 350px;
            /* 确保列表可滚动 */
            overflow-y: auto;
        }

        .office-list.active {
            display: block;
            /* Active 状态下显示 */
        }

        .office-list li {
            font-size: 1rem;
            /* 16px */
            padding: 0.75rem 0.5rem;
            /* 12px 8px */
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .office-list li:hover {
            background-color: var(--lihang-blue);
        }

        /* 提示框 Tooltip */
        .tooltip-popup {
            position: fixed;
            /* 使用 fixed 以便在 Swiper 中正确定位 */
            display: none;
            width: 380px;
            background: #fff;
            color: var(--text-dark);
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            z-index: 200;
            overflow: hidden;
            border: 1px solid #ddd;
        }

        .tooltip-top {
            display: flex;
            align-items: center;
            background: #f7f7f7;
            padding: 1rem;
            /* 16px */
            gap: 1rem;
            /* 16px */
            border-bottom: 1px solid #eee;
        }

        .tooltip-top img {
            width: 120px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
        }

        .tooltip-top .title {
            font-size: 1.25rem;
            /* 20px */
            font-weight: bold;
            color: var(--lihang-blue);
        }

        .tooltip-bottom {
            display: flex;
            padding: 1rem;
            /* 16px */
            gap: 1rem;
            /* 16px */
        }

        .tooltip-bottom .qr-code {
            width: 100px;
            height: 100px;
        }

        .tooltip-bottom .line {
            width: 1px;
            background: #eee;
        }

        .tooltip-xingxi {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            /* 8px */
            font-size: 0.875rem;
            /* 14px */
        }

        .tooltip-xingxi .info-line {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            /* 8px */
        }

        .tooltip-xingxi .info-line img {
            width: 16px;
            height: 16px;
        }

        .tooltip-xingxi .info-line.address {
            align-items: flex-start;
        }

        /* 11. 响应式设计 */
        @media (max-width: 1200px) {
            /* 调整断点 */
            .about-layout-container {
                flex-direction: column;
                gap: 1rem;
            }

            .timeline-column,
            .profile-column {
                min-width: 100%;
                width: 100%;
            }

            .page-slide-5 {
                flex-direction: column;
                padding: 5rem 3%;
                overflow-y: auto;
            }

            .contact-info,
            .office-locator {
                max-width: 100%;
                width: 100%;
                box-sizing: border-box;
            }

            .office-locator {
                height: auto;
            }
        }

        @media (max-width: 900px) {
            .main-header {
                padding: 1rem;
                /* 16px */
            }

            .main-header .nav-links {
                display: none;
                /* 在移动端，通常会用汉堡菜单代替 */
            }

            .page-slide-1 .home-links {
                flex-direction: column;
                bottom: 80px;
                width: 90%;
                /* 移动端宽度 */
            }

            .page-slide-1 .home-thumb-item {
                width: 60vw;
            }

            /* Slide 2: About */
            .page-slide-2 {
                padding: 5rem 3%;
                /* 80px */
            }

            .timeline-container::before {
                left: 10px;
            }

            .timeline-point {
                width: 100%;
                left: 0 !important;
                padding-left: 3rem !important;
                /* 48px */
                padding-right: 0 !important;
                text-align: left !important;
            }

            .timeline-point::after {
                left: 10px !important;
                transform: translateX(-50%) !important;
            }

            .profile-top {
                flex-direction: column;
            }

            .profile-bottom {
                flex-direction: column;
            }

            /* Slide 3: Value */
            .client-value-section {
                padding: 1.5rem;
                /* 24px */
            }

            /* Slide 4: Careers */
            .benefits-container {
                flex-direction: column;
                width: 90%;
            }

            .benefit-card {
                width: 100%;
                box-sizing: border-box;
            }

            /* Slide 5: Contact */
            .tooltip-popup {
                /* 在移动端，提示框可能需要全屏或不同定位 */
                display: none !important;
                /* 为简单起见，在移动端禁用 */
            }
        }