:root {
            --h5hz5o-primary: #8ab4f8;
            --h5hz5o-bg: #0b0e14;
            --h5hz5o-surface: #1a1d23;
            --h5hz5o-text: #e8eaed;
            --h5hz5o-text-dim: #9aa0a6;
            --h5hz5o-accent: #c2e7ff;
            --h5hz5o-border: #3c4043;
            --h5hz5o-spacing-unit: 8px;
            --h5hz5o-container-width: 1100px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--h5hz5o-bg);
            color: var(--h5hz5o-text);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏设计 */
        .h5hz5o-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(11, 14, 20, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--h5hz5o-border);
        }

        .h5hz5o-nav-container {
            max-width: var(--h5hz5o-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
        }

        .h5hz5o-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .h5hz5o-logo img {
            height: 32px;
            display: block;
        }

        .h5hz5o-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
        }

        .h5hz5o-menu-item a {
            text-decoration: none;
            color: var(--h5hz5o-text-dim);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .h5hz5o-menu-item a:hover {
            color: var(--h5hz5o-primary);
        }

        .h5hz5o-menu-item.h5hz5o-active a {
            color: var(--h5hz5o-primary);
            position: relative;
        }

        .h5hz5o-menu-item.h5hz5o-active a::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--h5hz5o-primary);
            border-radius: 2px;
        }

        /* Hero 区设计 - 独特中心视觉 */
        .h5hz5o-hero {
            padding: 160px 24px 96px;
            text-align: center;
            background: radial-gradient(circle at 50% 30%, rgba(138, 180, 248, 0.1) 0%, transparent 70%);
            position: relative;
        }

        .h5hz5o-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .h5hz5o-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 700;
            margin-bottom: 24px;
            background: linear-gradient(180deg, #fff 0%, #9aa0a6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .h5hz5o-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--h5hz5o-text-dim);
            max-width: 600px;
            margin: 0 auto 48px;
        }

        /* 模拟深色模式切换按钮 */
        .h5hz5o-mode-preview {
            width: 280px;
            height: 160px;
            background: var(--h5hz5o-surface);
            border-radius: 24px;
            margin: 0 auto;
            border: 4px solid var(--h5hz5o-border);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        }

        .h5hz5o-toggle-track {
            width: 80px;
            height: 40px;
            background: var(--h5hz5o-primary);
            border-radius: 20px;
            position: relative;
            cursor: pointer;
        }

        .h5hz5o-toggle-thumb {
            width: 32px;
            height: 32px;
            background: white;
            border-radius: 50%;
            position: absolute;
            right: 4px;
            top: 4px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }

        /* 核心动力区块 */
        .h5hz5o-section {
            padding: 96px 24px;
            max-width: var(--h5hz5o-container-width);
            margin: 0 auto;
        }

        .h5hz5o-section-header {
            margin-bottom: 64px;
        }

        .h5hz5o-section-tag {
            color: var(--h5hz5o-primary);
            text-transform: uppercase;
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .h5hz5o-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .h5hz5o-tech-card {
            background: var(--h5hz5o-surface);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--h5hz5o-border);
            transition: transform 0.3s ease, border-color 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .h5hz5o-tech-card:hover {
            transform: translateY(-8px);
            border-color: var(--h5hz5o-primary);
        }

        .h5hz5o-card-title {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--h5hz5o-accent);
        }

        .h5hz5o-card-desc {
            color: var(--h5hz5o-text-dim);
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .h5hz5o-metric {
            font-size: 14px;
            padding: 8px 16px;
            background: rgba(138, 180, 248, 0.1);
            color: var(--h5hz5o-primary);
            border-radius: 32px;
            align-self: flex-start;
        }

        /* 安全防护区块 - 独特的不对称布局 */
        .h5hz5o-security-layout {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
        }

        .h5hz5o-security-text {
            flex: 1 1 400px;
            min-width: 0;
        }

        .h5hz5o-shield-list {
            list-style: none;
        }

        .h5hz5o-shield-item {
            margin-bottom: 32px;
            padding-left: 24px;
            border-left: 2px solid var(--h5hz5o-border);
            transition: border-color 0.3s ease;
        }

        .h5hz5o-shield-item:hover {
            border-left-color: var(--h5hz5o-primary);
        }

        .h5hz5o-shield-type {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
            display: block;
        }

        .h5hz5o-shield-mech {
            color: var(--h5hz5o-text-dim);
            font-size: 15px;
            margin-bottom: 8px;
        }

        .h5hz5o-shield-update {
            font-size: 12px;
            color: #81c995;
            font-weight: 600;
        }

        /* FAQ 区块 */
        .h5hz5o-faq {
            background: var(--h5hz5o-surface);
            border-radius: 24px;
            padding: 64px;
            margin-bottom: 96px;
        }

        .h5hz5o-faq-item {
            border-bottom: 1px solid var(--h5hz5o-border);
            padding: 24px 0;
        }

        .h5hz5o-faq-item:last-child {
            border-bottom: none;
        }

        .h5hz5o-question {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--h5hz5o-accent);
            display: flex;
            align-items: center;
        }

        .h5hz5o-question::before {
            content: 'Q:';
            margin-right: 12px;
            color: var(--h5hz5o-primary);
        }

        .h5hz5o-answer {
            color: var(--h5hz5o-text-dim);
            padding-left: 34px;
        }

        /* 页脚设计 */
        .h5hz5o-footer {
            border-top: 1px solid var(--h5hz5o-border);
            padding: 64px 24px;
            background: #000;
        }

        .h5hz5o-footer-content {
            max-width: var(--h5hz5o-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .h5hz5o-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .h5hz5o-footer-brand-name {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            color: #fff;
        }

        .h5hz5o-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .h5hz5o-footer-col h4 {
            margin-bottom: 24px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--h5hz5o-text-dim);
        }

        .h5hz5o-footer-col ul {
            list-style: none;
        }

        .h5hz5o-footer-col li {
            margin-bottom: 12px;
        }

        .h5hz5o-footer-col a {
            text-decoration: none;
            color: var(--h5hz5o-text-dim);
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .h5hz5o-footer-col a:hover {
            color: #fff;
        }

        .h5hz5o-copyright {
            max-width: var(--h5hz5o-container-width);
            margin: 48px auto 0;
            padding-top: 24px;
            border-top: 1px solid #222;
            color: #5f6368;
            font-size: 12px;
            text-align: center;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .h5hz5o-menu {
                display: none; /* 简化演示，移动端可做汉堡菜单 */
            }
            .h5hz5o-hero {
                padding: 120px 24px 64px;
            }
            .h5hz5o-faq {
                padding: 32px;
            }
            .h5hz5o-grid {
                grid-template-columns: 1fr;
            }
        }