:root {
            --h0u505-primary: #4285F4;
            --h0u505-success: #34A853;
            --h0u505-warning: #FBBC05;
            --h0u505-danger: #EA4335;
            --h0u505-text-main: #202124;
            --h0u505-text-sub: #5F6368;
            --h0u505-bg-light: #F8F9FA;
            --h0u505-white: #FFFFFF;
            --h0u505-radius: 16px;
            --h0u505-container: 1100px;
            --h0u505-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--h0u505-text-main);
            background-color: var(--h0u505-white);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 布局基础 */
        .h0u505-container {
            max-width: var(--h0u505-container);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .h0u505-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .h0u505-flex-item {
            min-width: 0;
        }

        /* 导航栏 */
        .h0u505-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid #eee;
            transition: var(--h0u505-transition);
        }

        .h0u505-nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .h0u505-logo {
            flex-shrink: 0;
        }

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

        .h0u505-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
        }

        .h0u505-nav-item a {
            text-decoration: none;
            color: var(--h0u505-text-sub);
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            border-radius: 20px;
            transition: var(--h0u505-transition);
        }

        .h0u505-nav-item a:hover {
            background-color: var(--h0u505-bg-light);
            color: var(--h0u505-primary);
        }

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

        /* Hero 区块 - 独特非对称布局 */
        .h0u505-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at 80% 20%, rgba(66, 133, 244, 0.05) 0%, transparent 40%);
            position: relative;
        }

        .h0u505-hero-content {
            text-align: center;
            max-width: 850px;
            margin: 0 auto;
        }

        .h0u505-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #202124 0%, #4285F4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .h0u505-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.4rem);
            color: var(--h0u505-text-sub);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 下载按钮组件 */
        .h0u505-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 64px;
        }

        .h0u505-download-card {
            background: var(--h0u505-white);
            border: 1px solid #e0e0e0;
            border-radius: var(--h0u505-radius);
            padding: 40px;
            text-align: center;
            transition: var(--h0u505-transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .h0u505-download-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--h0u505-primary);
        }

        .h0u505-card-icon-box {
            width: 64px;
            height: 64px;
            background: var(--h0u505-bg-light);
            border-radius: 50%;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
        }

        .h0u505-card-title {
            font-size: 24px;
            margin-bottom: 12px;
        }

        .h0u505-card-desc {
            color: var(--h0u505-text-sub);
            font-size: 14px;
            margin-bottom: 32px;
        }

        .h0u505-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: var(--h0u505-transition);
            cursor: pointer;
            border: none;
        }

        .h0u505-btn-primary {
            background-color: var(--h0u505-primary);
            color: var(--h0u505-white);
        }

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

        /* 安全盾矩阵区块 */
        .h0u505-security-section {
            padding: 96px 0;
            background-color: #f1f3f4;
        }

        .h0u505-section-tag {
            display: inline-block;
            color: var(--h0u505-primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h0u505-section-title {
            font-size: 36px;
            margin-bottom: 48px;
            max-width: 600px;
        }

        .h0u505-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .h0u505-matrix-item {
            background: var(--h0u505-white);
            padding: 32px;
            border-radius: var(--h0u505-radius);
            position: relative;
            overflow: hidden;
        }

        .h0u505-matrix-item::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: var(--h0u505-primary);
        }

        .h0u505-layer-name {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--h0u505-primary);
        }

        .h0u505-protection-logic {
            font-size: 15px;
            color: var(--h0u505-text-main);
            margin-bottom: 24px;
        }

        .h0u505-security-meta {
            display: flex;
            gap: 16px;
            font-size: 13px;
            color: var(--h0u505-text-sub);
            border-top: 1px dashed #ddd;
            padding-top: 16px;
        }

        /* 未来愿景区块 */
        .h0u505-vision-section {
            padding: 96px 0;
        }

        .h0u505-timeline {
            position: relative;
            margin-top: 64px;
        }

        .h0u505-timeline::before {
            content: "";
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 100%;
            background: #e0e0e0;
        }

        .h0u505-milestone {
            margin-bottom: 64px;
            display: flex;
            justify-content: center;
            align-items: center;
            width: 100%;
            position: relative;
        }

        .h0u505-milestone-content {
            width: 45%;
            background: var(--h0u505-bg-light);
            padding: 32px;
            border-radius: var(--h0u505-radius);
            position: relative;
        }

        .h0u505-milestone:nth-child(even) .h0u505-milestone-content {
            margin-left: auto;
        }

        .h0u505-milestone:nth-child(odd) .h0u505-milestone-content {
            margin-right: auto;
            text-align: right;
        }

        .h0u505-year {
            font-size: 24px;
            font-weight: 800;
            color: var(--h0u505-primary);
            margin-bottom: 8px;
        }

        .h0u505-focus {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .h0u505-status-badge {
            display: inline-block;
            padding: 4px 12px;
            background: #e8f0fe;
            color: var(--h0u505-primary);
            border-radius: 12px;
            font-size: 12px;
            font-weight: 700;
        }

        /* 页脚 */
        .h0u505-footer {
            background-color: var(--h0u505-text-main);
            color: #bdc1c6;
            padding: 80px 0 40px;
        }

        .h0u505-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .h0u505-footer-brand {
            grid-column: span 2;
        }

        .h0u505-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            color: var(--h0u505-white);
            margin-bottom: 16px;
        }

        .h0u505-footer-title {
            color: var(--h0u505-white);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 24px;
        }

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

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

        .h0u505-footer-links a {
            color: inherit;
            text-decoration: none;
            transition: var(--h0u505-transition);
        }

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

        .h0u505-footer-bottom {
            padding-top: 40px;
            border-top: 1px solid #3c4043;
            text-align: center;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .h0u505-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .h0u505-timeline::before {
                left: 20px;
            }
            .h0u505-milestone-content {
                width: calc(100% - 60px);
                margin-left: 60px !important;
                text-align: left !important;
            }
        }

        @media (max-width: 768px) {
            .h0u505-hero {
                padding: 120px 0 64px;
            }
            .h0u505-matrix-grid, .h0u505-download-grid {
                grid-template-columns: 1fr;
            }
        }