* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: system-ui, -apple-system, Microsoft YaHei, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.7;
        }
        ul,li {
            list-style: none;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        /* 顶部导航 */
        header {
            background: #00a090;
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 99;
            box-shadow: 0 2px 8px rgba(0,160,144,0.25);
        }
        .header-wrap {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 64px;
        }
        .logo {
            font-size: 22px;
            font-weight: bold;
        }
        /* PC导航菜单 */
        .pc-nav ul {
            display: flex;
            gap: 30px;
        }
        .pc-nav a {
            padding: 8px 0;
            position: relative;
        }
        .pc-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #fff;
            transition: 0.3s all;
        }
        .pc-nav a:hover::after {
            width: 100%;
        }
        /* 移动端菜单按钮 */
        .menu-btn {
            display: none;
            font-size: 26px;
            cursor: pointer;
        }
        /* 移动端侧边滑菜单 */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -280px;
            width: 280px;
            height: 100vh;
            background: #00a090;
            z-index: 100;
            transition: right 0.3s ease;
            padding: 30px 20px;
        }
        .mobile-menu.active {
            right: 0;
        }
        .mobile-menu .close-btn {
            font-size: 28px;
            text-align: right;
            margin-bottom: 30px;
            cursor: pointer;
        }
        .mobile-menu li {
            margin: 18px 0;
            font-size: 17px;
        }
        /* 遮罩层 */
        .mask {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(0,0,0,0.4);
            z-index: 99;
            display: none;
        }
        .mask.active {
            display: block;
        }
        /* 首屏banner */
        .banner {
            background: linear-gradient(135deg, #00a090, #007c70);
            color: #fff;
            padding: 60px 0;
            text-align: center;
        }
        .banner h1 {
            font-size: 36px;
            margin-bottom: 15px;
        }
        .banner p {
            font-size: 18px;
            opacity: 0.9;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        /* 通用区块样式 */
        .section {
            padding: 60px 0;
        }
        .section-title {
            text-align: center;
            font-size: 28px;
            margin-bottom: 45px;
            color: #00a090;
            position: relative;
        }
        .section-title::after {
            content: '';
            width: 60px;
            height: 3px;
            background: #00a090;
            display: block;
            margin: 12px auto 0;
        }
        /* 核心功能模块 */
        .func-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }
        .func-item {
            background: #fff;
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: 0 3px 12px rgba(0,0,0,0.06);
            transition: 0.3s transform;
        }
        .func-item:hover {
            transform: translateY(-6px);
        }
        .func-item h3 {
            color: #00a090;
            margin-bottom: 12px;
            font-size: 19px;
        }
        /* 适用场景 */
        .scene-wrap {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .scene-item {
            background: #fff;
            padding: 25px;
            border-radius: 10px;
        }
        /* 系统要求表格 */
        .sys-table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            border-radius: 10px;
            overflow: hidden;
        }
        .sys-table th, .sys-table td {
            border: 1px solid #eee;
            padding: 14px;
            text-align: center;
        }
        .sys-table th {
            background: #00a090;
            color: #fff;
        }
        /* 下载模块 */
        .download-box {
            background: #fff;
            border-radius: 14px;
            padding: 40px;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(0,160,144,0.12);
        }
        .download-left {
            flex: 1;
            min-width: 300px;
        }
        .download-right {
            text-align: center;
        }
        .qrcode-box img{
            width: 160px;
            height: 160px;
            border: 2px solid #00a090;
            border-radius: 8px;
            margin: 0 auto 12px;
            background: #eee;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .download-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 25px;
        }
        .download-btn {
            display: inline-block;
            padding: 14px 28px;
            border-radius: 8px;
            color: #fff;
            font-weight: 500;
            text-align: center;
            min-width: 150px;
            transition: 0.2s opacity;
        }
        .download-btn:hover {
            opacity: 0.88;
        }
        .btn-local {
            background: #00a090;
        }
        .btn-quark {
            background: #25b7f5;
        }
        .btn-xunlei {
            background: #ff3d3d;
        }
        /* FAQ 常见问题 */
        .faq-list {
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
        }
        .faq-item {
            border-bottom: 1px solid #eee;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-que {
            padding: 18px 22px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 500;
            font-size: 16px;
        }
        .faq-ans {
            padding: 0 22px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
            color: #555;
        }
        .faq-item.active .faq-ans {
            padding: 0 22px 18px;
            max-height: 800px;
        }
        /* 使用教程 */
        .tutorial-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .tutorial-step {
            background: #fff;
            padding: 20px 25px;
            border-radius: 10px;
        }
        .step-num {
            display: inline-block;
            width: 26px;
            height: 26px;
            line-height: 26px;
            text-align: center;
            background: #00a090;
            color: #fff;
            border-radius: 50%;
            margin-right: 10px;
        }
        /* 友情链接 */
        .link-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            background: #fff;
            padding: 25px;
            border-radius: 10px;
        }
        .link-item {
            padding: 8px 16px;
            background: #f0f8f7;
            border-radius: 6px;
            color: #00a090;
        }
        /* 返回顶部按钮 */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            background: #00a090;
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.15);
            opacity: 0;
            visibility: hidden;
            transition: 0.3s all;
            z-index: 98;
        }
        .back-top.show {
            opacity: 1;
            visibility: visible;
        }
        /* 页脚 */
        footer {
            background: #005c52;
            color: #ddd;
            padding: 40px 0 20px;
            margin-top: 30px;
        }
        .footer-wrap {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 35px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 18px;
        }
        .footer-col li {
            margin: 8px 0;
        }
        .footer-col a {
            opacity: 0.85;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #006e62;
            font-size: 14px;
        }
        /* 移动端适配 */
        @media screen and (max-width: 992px) {
            .pc-nav {
                display: none;
            }
            .menu-btn {
                display: block;
            }
            .func-list {
                grid-template-columns: repeat(2,1fr);
            }
            .footer-wrap {
                grid-template-columns: repeat(2,1fr);
            }
        }
        @media screen and (max-width: 640px) {
            .banner h1 {
                font-size: 26px;
            }
            .section-title {
                font-size: 24px;
            }
            .func-list {
                grid-template-columns: 1fr;
            }
            .scene-wrap {
                grid-template-columns: 1fr;
            }
            .download-box {
                padding: 25px 15px;
            }
            .download-buttons {
                flex-direction: column;
            }
            .download-btn {
                width: 100%;
            }
            .footer-wrap {
                grid-template-columns: 1fr;
            }
        }