:root {
            --r6tl-primary: #FF6C37;
            --r6tl-secondary: #00F2FE;
            --r6tl-bg-dark: #0a0e14;
            --r6tl-bg-card: #161b22;
            --r6tl-text-main: #e6edf3;
            --r6tl-text-muted: #8b949e;
            --r6tl-white: #ffffff;
            --r6tl-spacing-unit: 8px;
            --r6tl-container-width: 1100px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--r6tl-bg-dark);
            color: var(--r6tl-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏 */
        .r6tl-nav-wrapper {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 20, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .r6tl-nav-container {
            max-width: var(--r6tl-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: calc(var(--r6tl-spacing-unit) * 2);
        }

        .r6tl-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .r6tl-logo img {
            height: 36px;
            display: block;
        }

        .r6tl-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: calc(var(--r6tl-spacing-unit) * 2);
        }

        .r6tl-menu-item a {
            text-decoration: none;
            color: var(--r6tl-text-main);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .r6tl-menu-item a:hover,
        .r6tl-menu-item a.r6tl-active {
            color: var(--r6tl-secondary);
        }

        /* 布局容器 */
        .r6tl-section {
            padding: calc(var(--r6tl-spacing-unit) * 10) calc(var(--r6tl-spacing-unit) * 3);
            max-width: var(--r6tl-container-width);
            margin: 0 auto;
            word-break: break-word;
        }

        /* Hero下载区 */
        .r6tl-hero {
            padding-top: calc(var(--r6tl-spacing-unit) * 18);
            text-align: center;
            background: radial-gradient(circle at top right, rgba(0, 242, 254, 0.05), transparent);
        }

        .r6tl-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: calc(var(--r6tl-spacing-unit) * 3);
            background: linear-gradient(135deg, #fff 0%, var(--r6tl-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        .r6tl-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--r6tl-text-muted);
            max-width: 800px;
            margin: 0 auto calc(var(--r6tl-spacing-unit) * 6);
        }

        /* 下载卡片组 */
        .r6tl-download-grid {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--r6tl-spacing-unit) * 4);
            justify-content: center;
            margin-bottom: calc(var(--r6tl-spacing-unit) * 8);
        }

        .r6tl-download-card {
            flex: 1;
            min-width: 320px;
            background: var(--r6tl-bg-card);
            border-radius: 20px;
            padding: calc(var(--r6tl-spacing-unit) * 4);
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: transform 0.3s ease, border-color 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .r6tl-download-card:hover {
            transform: translateY(-8px);
            border-color: var(--r6tl-secondary);
        }

        .r6tl-os-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 12px;
            margin-bottom: calc(var(--r6tl-spacing-unit) * 3);
        }

        .r6tl-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
            text-align: center;
        }

        .r6tl-btn-primary {
            background: var(--r6tl-secondary);
            color: var(--r6tl-bg-dark);
        }

        .r6tl-btn-primary:hover {
            box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
            transform: scale(1.02);
        }

        /* 编排矩阵区 */
        .r6tl-matrix-section {
            background: rgba(255, 255, 255, 0.02);
            border-radius: 32px;
            margin: calc(var(--r6tl-spacing-unit) * 8) auto;
        }

        .r6tl-matrix-title {
            font-size: 2rem;
            margin-bottom: calc(var(--r6tl-spacing-unit) * 6);
            text-align: center;
        }

        .r6tl-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--r6tl-spacing-unit) * 3);
        }

        .r6tl-matrix-item {
            padding: calc(var(--r6tl-spacing-unit) * 3);
            border-left: 2px solid var(--r6tl-secondary);
            background: rgba(255, 255, 255, 0.03);
        }

        .r6tl-matrix-stage {
            color: var(--r6tl-secondary);
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .r6tl-matrix-method {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .r6tl-matrix-payload {
            font-size: 0.9rem;
            color: var(--r6tl-text-muted);
        }

        /* 安装指南区 */
        .r6tl-guide-container {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--r6tl-spacing-unit) * 6);
            align-items: center;
        }

        .r6tl-guide-content {
            flex: 1;
            min-width: 300px;
        }

        .r6tl-guide-img-box {
            flex: 1;
            min-width: 300px;
        }

        .r6tl-guide-img {
            width: 100%;
            border-radius: 16px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        }

        .r6tl-step-list {
            list-style: none;
            margin-top: calc(var(--r6tl-spacing-unit) * 4);
        }

        .r6tl-step-item {
            margin-bottom: calc(var(--r6tl-spacing-unit) * 3);
            display: flex;
            gap: 16px;
        }

        .r6tl-step-num {
            flex: 0 0 32px;
            height: 32px;
            background: var(--r6tl-secondary);
            color: var(--r6tl-bg-dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        /* 页脚 */
        .r6tl-footer {
            background: #05070a;
            padding: calc(var(--r6tl-spacing-unit) * 8) calc(var(--r6tl-spacing-unit) * 3);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-top: calc(var(--r6tl-spacing-unit) * 10);
        }

        .r6tl-footer-content {
            max-width: var(--r6tl-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: calc(var(--r6tl-spacing-unit) * 4);
        }

        .r6tl-footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .r6tl-footer-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--r6tl-white);
            margin-bottom: 16px;
        }

        .r6tl-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--r6tl-spacing-unit) * 6);
        }

        .r6tl-footer-col {
            min-width: 120px;
        }

        .r6tl-footer-col h4 {
            margin-bottom: 20px;
            color: var(--r6tl-white);
        }

        .r6tl-footer-col ul {
            list-style: none;
        }

        .r6tl-footer-col li {
            margin-bottom: 10px;
        }

        .r6tl-footer-col a {
            color: var(--r6tl-text-muted);
            text-decoration: none;
            transition: color 0.3s;
        }

        .r6tl-footer-col a:hover {
            color: var(--r6tl-secondary);
        }

        .r6tl-copyright {
            width: 100%;
            text-align: center;
            padding-top: calc(var(--r6tl-spacing-unit) * 6);
            margin-top: calc(var(--r6tl-spacing-unit) * 6);
            border-top: 1px solid rgba(255,255,255,0.05);
            color: var(--r6tl-text-muted);
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .r6tl-menu {
                display: none; /* 简化移动端，实际项目中应有汉堡菜单 */
            }
            .r6tl-download-card {
                min-width: 100%;
            }
            .r6tl-hero-title {
                font-size: 2rem;
            }
        }