:root {
            --r50ey1-primary: #4285F4;
            --r50ey1-accent: #FBBC04;
            --r50ey1-error: #EA4335;
            --r50ey1-success: #34A853;
            --r50ey1-bg: #f8f9fa;
            --r50ey1-card-bg: #ffffff;
            --r50ey1-text-main: #202124;
            --r50ey1-text-sub: #5f6368;
            --r50ey1-radius: 24px;
            --r50ey1-spacing-unit: 8px;
            --r50ey1-container-width: 1100px;
        }

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

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--r50ey1-bg);
            color: var(--r50ey1-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏 */
        .r50ey1-navbar {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: calc(var(--r50ey1-spacing-unit) * 2) 0;
        }

        .r50ey1-nav-container {
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .r50ey1-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .r50ey1-logo img {
            height: 32px;
            display: block;
        }

        .r50ey1-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .r50ey1-nav-menu li {
            min-width: 0;
        }

        .r50ey1-nav-link {
            text-decoration: none;
            color: var(--r50ey1-text-sub);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 12px;
            transition: all 0.3s ease;
        }

        .r50ey1-nav-link:hover {
            background: rgba(66, 133, 244, 0.08);
            color: var(--r50ey1-primary);
        }

        .r50ey1-nav-link.active {
            color: var(--r50ey1-primary);
            background: rgba(66, 133, 244, 0.12);
        }

        /* Hero 区块 */
        .r50ey1-hero {
            padding: 96px 24px;
            text-align: center;
            background: radial-gradient(circle at 50% 50%, #ffffff 0%, #f1f3f4 100%);
        }

        .r50ey1-hero-inner {
            max-width: 800px;
            margin: 0 auto;
        }

        .r50ey1-hero-badge {
            display: inline-block;
            background: var(--r50ey1-success);
            color: white;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-bottom: 24px;
            font-weight: bold;
        }

        .r50ey1-hero h1 {
            font-size: clamp(2rem, 5vw, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--r50ey1-text-main);
            word-break: break-word;
        }

        .r50ey1-hero p {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--r50ey1-text-sub);
            max-width: 600px;
            margin: 0 auto 48px;
            word-break: break-word;
        }

        /* 隐私保护核心架构 Grid */
        .r50ey1-section {
            padding: 64px 24px;
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
        }

        .r50ey1-section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .r50ey1-section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 16px;
        }

        .r50ey1-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .r50ey1-card {
            background: var(--r50ey1-card-bg);
            padding: 40px;
            border-radius: var(--r50ey1-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.02), 0 1px 3px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            min-width: 0;
            border: 1px solid transparent;
        }

        .r50ey1-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
            border-color: var(--r50ey1-primary);
        }

        .r50ey1-card-icon {
            font-size: 3rem;
            margin-bottom: 24px;
            display: block;
        }

        .r50ey1-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--r50ey1-primary);
        }

        .r50ey1-card p {
            color: var(--r50ey1-text-sub);
            font-size: 1rem;
            line-height: 1.7;
            word-break: break-word;
        }

        /* 隐私沙盒 - 特色展示区 */
        .r50ey1-feature-block {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            background: #fff;
            border-radius: 32px;
            overflow: hidden;
            margin-top: 64px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .r50ey1-feature-content {
            flex: 1 1 450px;
            padding: 64px;
            min-width: 0;
        }

        .r50ey1-feature-visual {
            flex: 1 1 450px;
            background: linear-gradient(135deg, #4285F4 0%, #34A853 100%);
            min-height: 400px;
            display: flex;
            align-items: center;
            justify-content: center;
            min-width: 0;
            position: relative;
        }

        .r50ey1-shield-logo {
            width: 150px;
            height: 180px;
            background: white;
            clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
        }

        /* 未来展望 - 列表 */
        .r50ey1-timeline {
            margin-top: 48px;
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .r50ey1-timeline-item {
            flex: 1 1 300px;
            background: #fff;
            padding: 32px;
            border-radius: 20px;
            border-left: 6px solid var(--r50ey1-accent);
            min-width: 0;
        }

        .r50ey1-timeline-tag {
            font-weight: bold;
            color: var(--r50ey1-accent);
            text-transform: uppercase;
            font-size: 0.8rem;
            margin-bottom: 8px;
            display: block;
        }

        /* 页脚 */
        .r50ey1-footer {
            background: #202124;
            color: #fff;
            padding: 64px 24px;
            margin-top: 96px;
        }

        .r50ey1-footer-container {
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .r50ey1-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .r50ey1-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            min-width: 0;
        }

        .r50ey1-footer-group h4 {
            margin-bottom: 24px;
            color: #9aa0a6;
            font-size: 0.9rem;
        }

        .r50ey1-footer-group ul {
            list-style: none;
        }

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

        .r50ey1-footer-group a {
            color: #e8eaed;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

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

        /* 响应式调整 */
        @media (max-width: 768px) {
            .r50ey1-nav-menu {
                justify-content: center;
                padding-top: 16px;
            }
            .r50ey1-feature-content {
                padding: 32px;
            }
            .r50ey1-hero h1 {
                font-size: 2.5rem;
            }
        }