:root {
            --h0u505-chrome-blue: #4285F4;
            --h0u505-chrome-red: #EA4335;
            --h0u505-chrome-yellow: #FBBC05;
            --h0u505-chrome-green: #34A853;
            --h0u505-text-main: #202124;
            --h0u505-text-sub: #5f6368;
            --h0u505-bg-light: #f8f9fa;
            --h0u505-white: #ffffff;
            --h0u505-container-max: 1400px;
            --h0u505-radius: 16px;
            --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, Arial, sans-serif;
            color: var(--h0u505-text-main);
            background-color: var(--h0u505-white);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏设计 */
        .h0u505-header {
            position: fixed;
            top: 0;
            left: 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: var(--h0u505-transition);
        }

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

        .h0u505-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .h0u505-logo img {
            height: 32px;
            width: auto;
        }

        .h0u505-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .h0u505-nav-link {
            text-decoration: none;
            color: var(--h0u505-text-sub);
            padding: 8px 16px;
            font-size: 0.95rem;
            font-weight: 500;
            border-radius: 20px;
            transition: var(--h0u505-transition);
            word-break: break-word;
        }

        .h0u505-nav-link:hover {
            background: rgba(0,0,0,0.04);
            color: var(--h0u505-chrome-blue);
        }

        .h0u505-nav-link.h0u505-active {
            color: var(--h0u505-chrome-blue);
            background: rgba(66, 133, 244, 0.1);
        }

        /* Hero 区块 - 独特非对称布局 */
        .h0u505-hero {
            padding: 160px 24px 96px;
            background: radial-gradient(circle at 80% 20%, rgba(66, 133, 244, 0.05) 0%, rgba(255, 255, 255, 0) 50%);
            display: flex;
            justify-content: center;
        }

        .h0u505-hero-inner {
            max-width: var(--h0u505-container-max);
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .h0u505-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .h0u505-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
            color: var(--h0u505-text-main);
        }

        .h0u505-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--h0u505-text-sub);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.6;
        }

        .h0u505-download-card {
            background: var(--h0u505-white);
            padding: 32px;
            border-radius: var(--h0u505-radius);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.05);
            display: inline-flex;
            flex-direction: column;
            gap: 16px;
            min-width: 300px;
            transition: var(--h0u505-transition);
        }

        .h0u505-download-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 30px 60px rgba(66, 133, 244, 0.12);
        }

        .h0u505-btn-primary {
            background: var(--h0u505-chrome-blue);
            color: white;
            padding: 18px 36px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1.1rem;
            text-decoration: none;
            text-align: center;
            transition: var(--h0u505-transition);
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.4);
        }

        .h0u505-btn-primary:hover {
            background: #3367d6;
            transform: scale(1.02);
        }

        .h0u505-version-info {
            font-size: 0.85rem;
            color: var(--h0u505-text-sub);
            text-align: center;
        }

        /* 安全盾矩阵 - Grid布局 */
        .h0u505-security-section {
            padding: 96px 24px;
            background-color: var(--h0u505-bg-light);
        }

        .h0u505-section-header {
            max-width: 800px;
            margin: 0 auto 64px;
            text-align: center;
        }

        .h0u505-section-label {
            color: var(--h0u505-chrome-blue);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            font-size: 0.9rem;
            margin-bottom: 16px;
            display: block;
        }

        .h0u505-matrix-grid {
            max-width: var(--h0u505-container-max);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .h0u505-security-card {
            background: var(--h0u505-white);
            padding: 48px;
            border-radius: var(--h0u505-radius);
            transition: var(--h0u505-transition);
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .h0u505-security-card:nth-child(1) { border-top: 4px solid var(--h0u505-chrome-red); }
        .h0u505-security-card:nth-child(2) { border-top: 4px solid var(--h0u505-chrome-green); }
        .h0u505-security-card:nth-child(3) { border-top: 4px solid var(--h0u505-chrome-blue); }

        .h0u505-card-tag {
            font-size: 0.75rem;
            padding: 4px 12px;
            background: var(--h0u505-bg-light);
            border-radius: 12px;
            display: inline-block;
            margin-bottom: 24px;
            color: var(--h0u505-text-sub);
        }

        .h0u505-card-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--h0u505-text-main);
        }

        .h0u505-card-body {
            color: var(--h0u505-text-sub);
            margin-bottom: 24px;
            word-break: break-word;
        }

        /* 未来愿景 - 时间轴风格 */
        .h0u505-vision-section {
            padding: 96px 24px;
            max-width: var(--h0u505-container-max);
            margin: 0 auto;
        }

        .h0u505-vision-container {
            display: flex;
            flex-wrap: wrap;
            gap: 0;
            border-left: 2px dashed rgba(0,0,0,0.1);
            padding-left: 48px;
            margin-left: 24px;
        }

        .h0u505-vision-item {
            flex: 1;
            min-width: 300px;
            padding: 48px 24px;
            position: relative;
        }

        .h0u505-vision-item::before {
            content: "";
            position: absolute;
            left: -58px;
            top: 56px;
            width: 18px;
            height: 18px;
            background: var(--h0u505-white);
            border: 4px solid var(--h0u505-chrome-blue);
            border-radius: 50%;
        }

        .h0u505-vision-year {
            font-size: 2.5rem;
            font-weight: 800;
            color: rgba(0,0,0,0.05);
            position: absolute;
            top: 10px;
            left: 24px;
            z-index: -1;
        }

        .h0u505-vision-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--h0u505-text-main);
        }

        .h0u505-vision-status {
            display: inline-block;
            padding: 2px 10px;
            background: #e8f0fe;
            color: var(--h0u505-chrome-blue);
            font-size: 0.8rem;
            border-radius: 4px;
            margin-top: 12px;
        }

        /* 动态区块 */
        .h0u505-dynamic-articles {
            padding: 64px 24px;
            background: #fff;
        }

        .h0u505-news-grid {
            max-width: var(--h0u505-container-max);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .h0u505-news-card {
            flex: 1;
            min-width: 280px;
            padding: 24px;
            border: 1px solid #eee;
            border-radius: 12px;
            transition: var(--h0u505-transition);
        }

        .h0u505-news-card:hover {
            border-color: var(--h0u505-chrome-blue);
        }

        /* 页脚设计 */
        .h0u505-footer {
            background: #1a1a1a;
            color: #9aa0a6;
            padding: 80px 24px 40px;
        }

        .h0u505-footer-inner {
            max-width: var(--h0u505-container-max);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .h0u505-footer-brand {
            flex: 1;
            min-width: 260px;
        }

        .h0u505-footer-brand-name {
            color: #fff;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h0u505-footer-links {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
            min-width: 320px;
        }

        .h0u505-footer-col h4 {
            color: #fff;
            margin-bottom: 20px;
            font-size: 1rem;
        }

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

        .h0u505-footer-col li {
            margin-bottom: 10px;
        }

        .h0u505-footer-col a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s;
        }

        .h0u505-footer-col a:hover {
            color: #fff;
        }

        .h0u505-footer-bottom {
            max-width: var(--h0u505-container-max);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid #3c4043;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            font-size: 0.85rem;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .h0u505-hero-inner {
                flex-direction: column;
                text-align: center;
            }
            .h0u505-hero-subtitle {
                margin: 0 auto 40px;
            }
            .h0u505-vision-container {
                border-left: none;
                padding-left: 0;
                margin-left: 0;
            }
            .h0u505-vision-item {
                border-bottom: 1px solid rgba(0,0,0,0.05);
            }
            .h0u505-vision-item::before {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .h0u505-nav-menu {
                display: none; /* 简化移动端，通常会配合汉堡菜单，此处仅做布局调整 */
            }
            .h0u505-nav-container {
                justify-content: center;
            }
            .h0u505-hero {
                padding-top: 120px;
            }
        }