:root {
            --r50ey1-primary: #4285F4;
            --r50ey1-accent: #FBBC04;
            --r50ey1-error: #EA4335;
            --r50ey1-success: #34A853;
            --r50ey1-text: #202124;
            --r50ey1-text-light: #5f6368;
            --r50ey1-bg: #ffffff;
            --r50ey1-bg-alt: #f8f9fa;
            --r50ey1-spacing-unit: 8px;
            --r50ey1-container-width: 1300px;
        }

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

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--r50ey1-text);
            line-height: 1.6;
            background-color: var(--r50ey1-bg);
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 */
        .r50ey1-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: box-shadow 0.3s ease;
        }

        .r50ey1-nav-container {
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

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

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

        .r50ey1-menu-item a {
            text-decoration: none;
            color: var(--r50ey1-text-light);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.2s ease;
            white-space: normal;
        }

        .r50ey1-menu-item a:hover {
            color: var(--r50ey1-primary);
            background: rgba(66, 133, 244, 0.05);
        }

        .r50ey1-menu-item.active a {
            color: var(--r50ey1-primary);
            font-weight: 700;
        }

        /* Hero 区 - 对角线视觉设计 */
        .r50ey1-hero {
            padding: 160px 24px 96px;
            background: linear-gradient(135deg, #fff 0%, #f1f3f4 100%);
            position: relative;
            overflow: hidden;
        }

        .r50ey1-hero::after {
            content: '';
            position: absolute;
            bottom: -50px;
            right: -50px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(251, 188, 4, 0.1) 0%, transparent 70%);
            border-radius: 50%;
        }

        .r50ey1-hero-inner {
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            min-width: 0;
        }

        .r50ey1-hero-content {
            flex: 1;
            min-width: 300px;
            padding-right: 48px;
        }

        .r50ey1-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--r50ey1-text);
            word-break: keep-all;
        }

        .r50ey1-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--r50ey1-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .r50ey1-hero-visual {
            flex: 1;
            min-width: 320px;
            display: flex;
            justify-content: center;
            position: relative;
        }

        /* 模拟密码管理器的卡片堆叠效果 */
        .r50ey1-card-stack {
            width: 100%;
            max-width: 450px;
            height: 300px;
            position: relative;
        }

        .r50ey1-mock-card {
            position: absolute;
            width: 100%;
            background: #fff;
            padding: 24px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.05);
            transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        .r50ey1-mock-card:nth-child(1) { z-index: 3; transform: translate(0, 0); }
        .r50ey1-mock-card:nth-child(2) { z-index: 2; transform: translate(30px, 30px); background: #f8f9fa; }
        .r50ey1-mock-card:nth-child(3) { z-index: 1; transform: translate(60px, 60px); background: #e8eaed; }

        .r50ey1-hero:hover .r50ey1-mock-card:nth-child(1) { transform: translate(-10px, -10px); }

        .r50ey1-mock-input {
            height: 12px;
            background: #e8eaed;
            border-radius: 6px;
            margin-bottom: 12px;
            width: 70%;
        }

        .r50ey1-mock-btn {
            height: 36px;
            background: var(--r50ey1-primary);
            border-radius: 18px;
            width: 100px;
            margin-top: 12px;
        }

        /* 功能卡片区 */
        .r50ey1-section {
            padding: 96px 24px;
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
        }

        .r50ey1-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .r50ey1-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(251, 188, 4, 0.1);
            color: #b08100;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

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

        .r50ey1-card {
            background: var(--r50ey1-bg);
            padding: 40px;
            border-radius: 24px;
            border: 1px solid #f1f3f4;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .r50ey1-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border-color: var(--r50ey1-accent);
        }

        .r50ey1-card-icon {
            font-size: 32px;
            margin-bottom: 24px;
            display: block;
        }

        .r50ey1-card-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

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

        .r50ey1-card-list li {
            font-size: 15px;
            color: var(--r50ey1-text-light);
            margin-bottom: 12px;
            display: flex;
            align-items: flex-start;
        }

        .r50ey1-card-list li::before {
            content: '✓';
            color: var(--r50ey1-success);
            margin-right: 12px;
            font-weight: bold;
        }

        /* 技术架构区 - 深色模式 */
        .r50ey1-tech-wrap {
            background: #202124;
            color: #fff;
            padding: 96px 24px;
            margin-top: 64px;
            border-radius: 48px 48px 0 0;
        }

        .r50ey1-tech-inner {
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
        }

        .r50ey1-tech-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-top: 48px;
        }

        .r50ey1-tech-item {
            flex: 1;
            min-width: 280px;
            border-left: 2px solid var(--r50ey1-accent);
            padding-left: 24px;
        }

        .r50ey1-tech-item h3 {
            color: var(--r50ey1-accent);
            margin-bottom: 16px;
            font-size: 20px;
        }

        .r50ey1-tech-item p {
            color: #bdc1c6;
            font-size: 15px;
            line-height: 1.8;
        }

        /* 动态愿景里程碑 */
        .r50ey1-milestones {
            padding: 96px 24px;
            background: var(--r50ey1-bg-alt);
        }

        .r50ey1-timeline {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            max-width: var(--r50ey1-container-width);
            margin: 0 auto;
        }

        .r50ey1-milestone-card {
            flex: 1;
            min-width: 300px;
            background: #fff;
            padding: 32px;
            border-radius: 16px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.03);
        }

        .r50ey1-period {
            font-weight: 800;
            color: var(--r50ey1-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            display: block;
        }

        /* 页脚 */
        .r50ey1-footer {
            background: #f8f9fa;
            padding: 64px 24px;
            border-top: 1px solid #e8eaed;
        }

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

        .r50ey1-footer-brand h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--r50ey1-text);
        }

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

        .r50ey1-footer-col h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .r50ey1-footer-col a {
            text-decoration: none;
            color: var(--r50ey1-text-light);
            font-size: 14px;
            transition: color 0.2s;
        }

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

        .r50ey1-bottom {
            text-align: center;
            padding-top: 48px;
            margin-top: 48px;
            border-top: 1px solid #e8eaed;
            color: #9aa0a6;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .r50ey1-nav-container { height: auto; padding: 16px 24px; }
            .r50ey1-menu { margin-top: 16px; width: 100%; justify-content: center; }
            .r50ey1-hero-content { padding-right: 0; text-align: center; margin-bottom: 48px; }
            .r50ey1-hero-subtitle { margin: 0 auto 40px; }
            .r50ey1-grid { grid-template-columns: 1fr; }
            .r50ey1-footer-inner { flex-direction: column; text-align: center; }
            .r50ey1-footer-links { justify-content: center; width: 100%; gap: 32px; }
        }