:root {
            --h0u505-primary: #4285F4;
            --h0u505-red: #EA4335;
            --h0u505-yellow: #FBBC05;
            --h0u505-green: #34A853;
            --h0u505-text: #202124;
            --h0u505-text-light: #5f6368;
            --h0u505-bg: #ffffff;
            --h0u505-bg-alt: #f8f9fa;
            --h0u505-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --h0u505-radius: 16px;
            --h0u505-container-width: 1100px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            color: var(--h0u505-text);
            background-color: var(--h0u505-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 */
        .h0u505-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);
        }

        .h0u505-nav-container {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .h0u505-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .h0u505-logo img {
            height: 32px;
            display: block;
        }

        .h0u505-nav-links {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .h0u505-nav-links a {
            text-decoration: none;
            color: var(--h0u505-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: var(--h0u505-transition);
        }

        .h0u505-nav-links a:hover {
            color: var(--h0u505-primary);
            background: rgba(66, 133, 244, 0.05);
        }

        .h0u505-nav-links a.active {
            color: var(--h0u505-primary);
            background: rgba(66, 133, 244, 0.1);
        }

        /* Hero 区块 - 独特堆叠设计 */
        .h0u505-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05) 0%, transparent 40%);
            overflow: hidden;
        }

        .h0u505-hero-content {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .h0u505-hero-text {
            min-width: 0;
        }

        .h0u505-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 700;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #202124 0%, #5f6368 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .h0u505-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.35rem);
            color: var(--h0u505-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .h0u505-version-stack {
            position: relative;
            height: 400px;
            min-width: 0;
        }

        .h0u505-stack-card {
            position: absolute;
            width: 80%;
            height: 240px;
            background: #fff;
            border-radius: var(--h0u505-radius);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--h0u505-transition);
        }

        .h0u505-stack-card:nth-child(1) { top: 0; left: 0; z-index: 3; transform: rotate(-2deg); }
        .h0u505-stack-card:nth-child(2) { top: 40px; left: 40px; z-index: 2; transform: rotate(2deg); background: #f1f3f4; }
        .h0u505-stack-card:nth-child(3) { top: 80px; left: 80px; z-index: 1; transform: rotate(-1deg); background: #e8eaed; }

        .h0u505-stack-card:hover {
            transform: translateY(-10px) rotate(0deg) scale(1.05);
            z-index: 10;
        }

        .h0u505-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 12px;
            background: var(--h0u505-primary);
            color: white;
        }

        /* 版本列表区块 */
        .h0u505-archive-section {
            padding: 96px 24px;
            background: var(--h0u505-bg-alt);
        }

        .h0u505-section-inner {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
        }

        .h0u505-section-header {
            margin-bottom: 48px;
            text-align: center;
        }

        .h0u505-version-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }

        .h0u505-version-item {
            background: #fff;
            padding: 32px;
            border-radius: var(--h0u505-radius);
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--h0u505-transition);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .h0u505-version-item:hover {
            box-shadow: 0 12px 24px rgba(0,0,0,0.08);
            transform: translateY(-4px);
        }

        .h0u505-v-number {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--h0u505-text);
        }

        .h0u505-v-date {
            font-size: 0.9rem;
            color: var(--h0u505-text-light);
        }

        .h0u505-download-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            background: var(--h0u505-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--h0u505-transition);
            margin-top: auto;
        }

        .h0u505-download-btn:hover {
            background: #1a73e8;
            box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
        }

        /* 安全矩阵区块 */
        .h0u505-security-matrix {
            padding: 96px 24px;
            background: #202124;
            color: #fff;
        }

        .h0u505-matrix-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin-top: 48px;
        }

        .h0u505-matrix-card {
            flex: 1;
            min-width: 280px;
            background: rgba(255,255,255,0.05);
            padding: 40px;
            border-radius: var(--h0u505-radius);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .h0u505-matrix-card h3 {
            color: var(--h0u505-primary);
            margin-bottom: 16px;
        }

        .h0u505-matrix-tag {
            font-size: 0.75rem;
            color: var(--h0u505-green);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-top: 24px;
            display: block;
        }

        /* 未来愿景区块 */
        .h0u505-vision-section {
            padding: 96px 24px;
        }

        .h0u505-timeline {
            max-width: 800px;
            margin: 48px auto 0;
            position: relative;
        }

        .h0u505-timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--h0u505-bg-alt);
        }

        .h0u505-timeline-item {
            padding-left: 40px;
            padding-bottom: 48px;
            position: relative;
        }

        .h0u505-timeline-item::after {
            content: '';
            position: absolute;
            left: -5px;
            top: 0;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--h0u505-primary);
        }

        .h0u505-year {
            font-weight: 700;
            color: var(--h0u505-primary);
            font-size: 1.2rem;
            margin-bottom: 8px;
        }

        /* 页脚 */
        .h0u505-footer {
            padding: 80px 24px 40px;
            background: var(--h0u505-bg-alt);
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .h0u505-footer-content {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
        }

        .h0u505-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .h0u505-footer-links h4 {
            margin-bottom: 24px;
            font-size: 1rem;
        }

        .h0u505-footer-links ul {
            list-style: none;
        }

        .h0u505-footer-links li {
            margin-bottom: 12px;
        }

        .h0u505-footer-links a {
            text-decoration: none;
            color: var(--h0u505-text-light);
            font-size: 0.9rem;
            transition: var(--h0u505-transition);
        }

        .h0u505-footer-links a:hover {
            color: var(--h0u505-primary);
        }

        .h0u505-copyright {
            max-width: var(--h0u505-container-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: var(--h0u505-text-light);
            font-size: 0.85rem;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .h0u505-nav-container {
                height: auto;
                padding: 16px;
            }
            .h0u505-nav-links {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
                gap: 8px;
            }
            .h0u505-nav-links a {
                font-size: 0.8rem;
                padding: 6px 8px;
            }
            .h0u505-hero {
                padding: 140px 24px 60px;
            }
            .h0u505-version-stack {
                height: 300px;
                display: none; /* 移动端隐藏复杂的堆叠动画 */
            }
            .h0u505-matrix-grid {
                flex-direction: column;
            }
        }