:root {
            --r50ey1-primary: #4285F4;
            --r50ey1-success: #34A853;
            --r50ey1-warning: #FBBC04;
            --r50ey1-danger: #EA4335;
            --r50ey1-text: #202124;
            --r50ey1-text-light: #5f6368;
            --r50ey1-bg: #ffffff;
            --r50ey1-bg-alt: #f8f9fa;
            --r50ey1-white: #ffffff;
            --r50ey1-font-main: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        }

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

        body {
            font-family: var(--r50ey1-font-main);
            color: var(--r50ey1-text);
            line-height: 1.6;
            background-color: var(--r50ey1-bg);
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 布局基础 */
        .r50ey1-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航栏 */
        .r50ey1-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .r50ey1-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
        }

        .r50ey1-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .r50ey1-logo img {
            height: 32px;
            width: auto;
        }

        .r50ey1-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .r50ey1-nav-item a {
            text-decoration: none;
            color: var(--r50ey1-text-light);
            font-size: 0.95rem;
            padding: 8px 16px;
            border-radius: 20px;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .r50ey1-nav-item a:hover {
            background: rgba(0,0,0,0.04);
            color: var(--r50ey1-primary);
        }

        .r50ey1-nav-item a.active {
            color: var(--r50ey1-primary);
            font-weight: 600;
            background: rgba(66, 133, 244, 0.1);
        }

        /* Hero下载区 - 独特舞台布局 */
        .r50ey1-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 50% -20%, #e8f0fe 0%, #ffffff 50%);
            text-align: center;
            position: relative;
        }

        .r50ey1-hero-content {
            max-width: 900px;
            margin: 0 auto;
            word-break: break-word;
        }

        .r50ey1-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #202124 0%, #4285F4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .r50ey1-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--r50ey1-text-light);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .r50ey1-download-stage {
            background: var(--r50ey1-white);
            padding: 48px;
            border-radius: 32px;
            box-shadow: 0 24px 80px rgba(0,0,0,0.08);
            display: inline-block;
            max-width: 100%;
            border: 1px solid rgba(0,0,0,0.03);
            transition: transform 0.3s ease;
        }

        .r50ey1-btn-primary {
            display: inline-block;
            background: var(--r50ey1-primary);
            color: white;
            padding: 20px 48px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.25rem;
            text-decoration: none;
            box-shadow: 0 8px 24px rgba(66, 133, 244, 0.3);
            transition: all 0.3s;
            margin-bottom: 16px;
        }

        .r50ey1-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(66, 133, 244, 0.4);
            background: #3367d6;
        }

        .r50ey1-meta-info {
            font-size: 0.85rem;
            color: var(--r50ey1-text-light);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        /* 核心技术架构 - 深度展示 */
        .r50ey1-section-arch {
            padding: 96px 0;
            background: #202124;
            color: white;
            overflow: hidden;
        }

        .r50ey1-arch-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .r50ey1-arch-card {
            background: rgba(255,255,255,0.05);
            padding: 40px;
            border-radius: 24px;
            border: 1px solid rgba(255,255,255,0.1);
            min-width: 0;
            transition: all 0.3s;
        }

        .r50ey1-arch-card:hover {
            background: rgba(255,255,255,0.08);
            border-color: var(--r50ey1-warning);
        }

        .r50ey1-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 6px;
            font-size: 0.75rem;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 16px;
            background: var(--r50ey1-warning);
            color: #000;
        }

        .r50ey1-arch-title {
            font-size: 1.75rem;
            margin-bottom: 16px;
            color: var(--r50ey1-white);
        }

        .r50ey1-arch-desc {
            font-size: 1rem;
            color: #9aa0a6;
            line-height: 1.8;
        }

        /* 智能生产力 - 卡片流 */
        .r50ey1-section-features {
            padding: 96px 0;
            background: var(--r50ey1-bg-alt);
        }

        .r50ey1-feature-row {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            margin-bottom: 80px;
        }

        .r50ey1-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .r50ey1-feature-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .r50ey1-feature-visual {
            flex: 1;
            min-width: 300px;
            background: var(--r50ey1-white);
            height: 400px;
            border-radius: 24px;
            box-shadow: 0 16px 48px rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        /* 模拟UI视觉效果 */
        .r50ey1-ui-mock {
            width: 80%;
            height: 60%;
            background: #f1f3f4;
            border-radius: 12px;
            position: relative;
            border: 8px solid #dadce0;
        }

        .r50ey1-ui-tab {
            width: 100px;
            height: 30px;
            background: var(--r50ey1-white);
            position: absolute;
            top: -30px;
            left: 20px;
            border-radius: 8px 8px 0 0;
        }

        .r50ey1-feature-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .r50ey1-capability-list {
            list-style: none;
        }

        .r50ey1-capability-item {
            padding: 12px 0;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            color: var(--r50ey1-text-light);
            display: flex;
            align-items: flex-start;
        }

        .r50ey1-capability-item::before {
            content: "✓";
            color: var(--r50ey1-success);
            font-weight: bold;
            margin-right: 12px;
        }

        /* 未来愿景 - 时间线布局 */
        .r50ey1-section-vision {
            padding: 96px 0;
            text-align: center;
        }

        .r50ey1-vision-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
            margin-top: 48px;
        }

        .r50ey1-vision-item {
            flex: 1;
            min-width: 280px;
            max-width: 400px;
            padding: 32px;
            background: var(--r50ey1-white);
            border-radius: 20px;
            border-top: 4px solid var(--r50ey1-primary);
            box-shadow: 0 8px 24px rgba(0,0,0,0.03);
            transition: transform 0.3s;
        }

        .r50ey1-vision-item:nth-child(2) { border-top-color: var(--r50ey1-success); }
        .r50ey1-vision-item:nth-child(3) { border-top-color: var(--r50ey1-danger); }

        .r50ey1-vision-item:hover {
            transform: translateY(-8px);
        }

        .r50ey1-vision-period {
            font-weight: 800;
            font-size: 1.2rem;
            margin-bottom: 12px;
            display: block;
        }

        /* 页脚 */
        .r50ey1-footer {
            background: var(--r50ey1-bg-alt);
            padding: 64px 0 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .r50ey1-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 48px;
        }

        .r50ey1-footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--r50ey1-text);
            margin-bottom: 16px;
        }

        .r50ey1-footer-links {
            list-style: none;
        }

        .r50ey1-footer-links li {
            margin-bottom: 12px;
        }

        .r50ey1-footer-links a {
            text-decoration: none;
            color: var(--r50ey1-text-light);
            font-size: 0.9rem;
            transition: color 0.2s;
        }

        .r50ey1-footer-links a:hover {
            color: var(--r50ey1-primary);
        }

        .r50ey1-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            font-size: 0.85rem;
            color: var(--r50ey1-text-light);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .r50ey1-nav-menu {
                display: none; /* 简化移动端，实际项目中应有汉堡菜单 */
            }
            .r50ey1-hero {
                padding-top: 120px;
                padding-bottom: 64px;
            }
            .r50ey1-feature-row {
                flex-direction: column !important;
            }
            .r50ey1-feature-visual {
                height: 250px;
            }
            .r50ey1-arch-card {
                padding: 24px;
            }
        }