:root {
            --h5hz5o-chrome-blue: #4285F4;
            --h5hz5o-chrome-red: #EA4335;
            --h5hz5o-chrome-yellow: #FBBC05;
            --h5hz5o-chrome-green: #34A853;
            --h5hz5o-text-main: #202124;
            --h5hz5o-text-sub: #5f6368;
            --h5hz5o-bg-light: #f8f9fa;
            --h5hz5o-white: #ffffff;
            --h5hz5o-spacing-unit: 8px;
            --h5hz5o-container-width: 1100px;
        }

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

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            color: var(--h5hz5o-text-main);
            background-color: var(--h5hz5o-white);
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* 导航栏 */
        .h5hz5o-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #e0e0e0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        .h5hz5o-nav-container {
            max-width: var(--h5hz5o-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .h5hz5o-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .h5hz5o-logo img {
            height: 32px;
            width: auto;
        }

        .h5hz5o-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            min-width: 0;
        }

        .h5hz5o-nav-item a {
            text-decoration: none;
            color: var(--h5hz5o-text-sub);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s ease;
            padding: 8px 4px;
            position: relative;
        }

        .h5hz5o-nav-item a:hover {
            color: var(--h5hz5o-chrome-blue);
        }

        .h5hz5o-nav-item a.h5hz5o-active {
            color: var(--h5hz5o-chrome-blue);
        }

        .h5hz5o-nav-item a.h5hz5o-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--h5hz5o-chrome-blue);
            border-radius: 2px;
        }

        /* Hero 区 */
        .h5hz5o-hero {
            padding: 96px 24px;
            background: radial-gradient(circle at top right, #f1f8ff 0%, #ffffff 70%);
            text-align: center;
        }

        .h5hz5o-hero-inner {
            max-width: 900px;
            margin: 0 auto;
        }

        .h5hz5o-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--h5hz5o-text-main);
            letter-spacing: -1px;
        }

        .h5hz5o-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--h5hz5o-text-sub);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        /* 快捷键卡片布局 */
        .h5hz5o-section {
            padding: 64px 24px;
            max-width: var(--h5hz5o-container-width);
            margin: 0 auto;
        }

        .h5hz5o-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .h5hz5o-card {
            background: var(--h5hz5o-white);
            border: 1px solid #eee;
            border-radius: 16px;
            padding: 32px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .h5hz5o-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
        }

        .h5hz5o-card-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .h5hz5o-card-title::before {
            content: '';
            width: 8px;
            height: 24px;
            background: var(--h5hz5o-chrome-blue);
            border-radius: 4px;
        }

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

        .h5hz5o-shortcut-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
        }

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

        .h5hz5o-key-desc {
            color: var(--h5hz5o-text-main);
            font-size: 15px;
            font-weight: 500;
        }

        .h5hz5o-kbd-group {
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
            justify-content: flex-end;
        }

        kbd {
            background-color: #f7f7f7;
            border: 1px solid #ccc;
            border-radius: 6px;
            box-shadow: 0 1px 0 rgba(0,0,0,0.2), inset 0 0 0 2px #fff;
            color: #333;
            display: inline-block;
            font-family: inherit;
            font-size: 13px;
            font-weight: 700;
            line-height: 1.4;
            margin: 0 0.1em;
            padding: 4px 8px;
            text-shadow: 0 1px 0 #fff;
            white-space: nowrap;
        }

        /* 技术架构区块 */
        .h5hz5o-tech-section {
            background-color: #fcfcfc;
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
        }

        .h5hz5o-tech-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 48px;
        }

        .h5hz5o-tech-item {
            flex: 1;
            min-width: 300px;
            padding: 24px;
            background: var(--h5hz5o-white);
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

        .h5hz5o-tech-name {
            color: var(--h5hz5o-chrome-green);
            font-weight: 700;
            margin-bottom: 12px;
            font-size: 1.25rem;
        }

        .h5hz5o-tech-desc {
            font-size: 15px;
            color: var(--h5hz5o-text-sub);
            margin-bottom: 16px;
            line-height: 1.8;
        }

        .h5hz5o-tech-meta {
            font-size: 13px;
            padding-top: 12px;
            border-top: 1px dashed #eee;
            color: var(--h5hz5o-chrome-blue);
        }

        /* 隐私与安全区块 */
        .h5hz5o-security-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .h5hz5o-security-card {
            padding: 32px;
            border-radius: 20px;
            background: #fff;
            border: 2px solid #f0f0f0;
        }

        .h5hz5o-security-type {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            background: #e8f0fe;
            color: var(--h5hz5o-chrome-blue);
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* 常见问题 */
        .h5hz5o-faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .h5hz5o-faq-item {
            margin-bottom: 24px;
            padding-bottom: 24px;
            border-bottom: 1px solid #eee;
        }

        .h5hz5o-faq-q {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: var(--h5hz5o-text-main);
        }

        .h5hz5o-faq-a {
            color: var(--h5hz5o-text-sub);
        }

        /* 页脚 */
        .h5hz5o-footer {
            background: #202124;
            color: #fff;
            padding: 64px 24px 32px;
        }

        .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;
            min-width: 250px;
        }

        .h5hz5o-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h5hz5o-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .h5hz5o-footer-column h4 {
            margin-bottom: 20px;
            color: #9aa0a6;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

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

        .h5hz5o-footer-column a {
            color: #fff;
            text-decoration: none;
            font-size: 14px;
            transition: opacity 0.3s;
        }

        .h5hz5o-footer-column a:hover {
            opacity: 0.7;
        }

        .h5hz5o-footer-bottom {
            max-width: var(--h5hz5o-container-width);
            margin: 48px auto 0;
            padding-top: 24px;
            border-top: 1px solid #3c4043;
            text-align: center;
            font-size: 13px;
            color: #9aa0a6;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .h5hz5o-nav-container {
                height: auto;
                padding: 16px 24px;
            }
            .h5hz5o-nav-menu {
                margin-top: 16px;
                gap: 12px;
                justify-content: center;
                width: 100%;
            }
            .h5hz5o-hero {
                padding: 64px 24px;
            }
            .h5hz5o-grid {
                grid-template-columns: 1fr;
            }
            .h5hz5o-tech-item {
                min-width: 100%;
            }
        }