:root {
            --rzm18-primary: #1a73e8;
            --rzm18-red: #ea4335;
            --rzm18-yellow: #fbbc04;
            --rzm18-green: #34a853;
            --rzm18-text: #202124;
            --rzm18-text-light: #5f6368;
            --rzm18-bg: #ffffff;
            --rzm18-bg-alt: #f8f9fa;
            --rzm18-gap: 8px;
            --rzm18-radius: 16px;
            --rzm18-container: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--rzm18-text);
            line-height: 1.6;
            background-color: var(--rzm18-bg);
            word-break: break-word;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .rzm18-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);
        }

        .rzm18-nav-container {
            max-width: var(--rzm18-container);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            flex-wrap: wrap;
        }

        .rzm18-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .rzm18-logo img {
            height: 32px;
            width: auto;
        }

        .rzm18-nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .rzm18-nav-item a {
            text-decoration: none;
            color: var(--rzm18-text-light);
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .rzm18-nav-item a:hover {
            color: var(--rzm18-primary);
        }

        .rzm18-nav-item.rzm18-active a {
            color: var(--rzm18-primary);
            position: relative;
        }

        .rzm18-nav-item.rzm18-active a::after {
            content: "";
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--rzm18-primary);
            border-radius: 2px;
        }

        /* Hero 区块 - 独特居中渐变风格 */
        .rzm18-hero {
            padding: 160px 24px 96px;
            text-align: center;
            background: radial-gradient(circle at top right, rgba(26, 115, 232, 0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(52, 168, 83, 0.05), transparent);
        }

        .rzm18-hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .rzm18-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -1px;
            color: var(--rzm18-text);
        }

        .rzm18-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
            color: var(--rzm18-text-light);
            margin-bottom: 48px;
            line-height: 1.5;
        }

        /* 核心快捷键卡片展示 */
        .rzm18-section-shortcuts {
            max-width: var(--rzm18-container);
            margin: 0 auto 96px;
            padding: 0 24px;
        }

        .rzm18-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .rzm18-card {
            background: var(--rzm18-bg-alt);
            border-radius: var(--rzm18-radius);
            padding: 40px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
        }

        .rzm18-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }

        .rzm18-card-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .rzm18-tag-blue { background: rgba(26, 115, 232, 0.1); color: var(--rzm18-primary); }
        .rzm18-tag-green { background: rgba(52, 168, 83, 0.1); color: var(--rzm18-green); }
        .rzm18-tag-red { background: rgba(234, 67, 53, 0.1); color: var(--rzm18-red); }

        .rzm18-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--rzm18-text);
        }

        .rzm18-card p {
            color: var(--rzm18-text-light);
            margin-bottom: 24px;
            line-height: 1.8;
        }

        /* 快捷键列表项样式 */
        .rzm18-key-list {
            list-style: none;
        }

        .rzm18-key-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .rzm18-key-item:last-child { border-bottom: none; }

        .rzm18-kbd {
            background: #fff;
            border: 1px solid #d1d5db;
            border-radius: 6px;
            box-shadow: 0 2px 0 #d1d5db;
            color: #374151;
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            line-height: 1;
            padding: 4px 8px;
            white-space: nowrap;
        }

        /* 安全矩阵区块 - 独特深色背景对比 */
        .rzm18-matrix-section {
            background: #000;
            color: #fff;
            padding: 96px 24px;
            margin-bottom: 96px;
        }

        .rzm18-matrix-container {
            max-width: var(--rzm18-container);
            margin: 0 auto;
        }

        .rzm18-matrix-header {
            margin-bottom: 64px;
            text-align: center;
        }

        .rzm18-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .rzm18-matrix-card {
            border: 1px solid rgba(255,255,255,0.1);
            padding: 32px;
            border-radius: 12px;
            background: rgba(255,255,255,0.03);
        }

        .rzm18-matrix-card h4 {
            color: var(--rzm18-primary);
            font-size: 14px;
            margin-bottom: 8px;
            letter-spacing: 1px;
        }

        .rzm18-matrix-title {
            font-size: 20px;
            margin-bottom: 16px;
        }

        .rzm18-matrix-desc {
            color: #9aa0a6;
            font-size: 15px;
            margin-bottom: 24px;
        }

        .rzm18-status-badge {
            font-size: 12px;
            padding: 2px 8px;
            border-radius: 4px;
            background: var(--rzm18-green);
            color: #000;
            font-weight: bold;
        }

        /* 动态资讯区块 */
        .rzm18-news-section {
            max-width: var(--rzm18-container);
            margin: 0 auto 96px;
            padding: 0 24px;
        }

        .rzm18-news-title {
            font-size: 32px;
            margin-bottom: 48px;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .rzm18-news-title::after {
            content: "";
            flex-grow: 1;
            height: 1px;
            background: rgba(0,0,0,0.1);
        }

        /* 页脚 */
        .rzm18-footer {
            background: var(--rzm18-bg-alt);
            padding: 80px 24px 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .rzm18-footer-inner {
            max-width: var(--rzm18-container);
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            flex-wrap: wrap;
            gap: 48px;
        }

        .rzm18-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .rzm18-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--rzm18-text);
        }

        .rzm18-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .rzm18-footer-column h5 {
            margin-bottom: 24px;
            color: var(--rzm18-text);
            font-size: 16px;
        }

        .rzm18-footer-column ul {
            list-style: none;
        }

        .rzm18-footer-column li {
            margin-bottom: 12px;
        }

        .rzm18-footer-column a {
            text-decoration: none;
            color: var(--rzm18-text-light);
            font-size: 14px;
            transition: color 0.3s;
        }

        .rzm18-footer-column a:hover {
            color: var(--rzm18-primary);
        }

        .rzm18-copyright {
            width: 100%;
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: var(--rzm18-text-light);
            font-size: 13px;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .rzm18-nav-container {
                height: auto;
                padding: 16px 24px;
            }
            .rzm18-nav-menu {
                margin-top: 16px;
                gap: 12px;
            }
            .rzm18-hero {
                padding-top: 120px;
            }
            .rzm18-grid {
                grid-template-columns: 1fr;
            }
            .rzm18-footer-links {
                gap: 32px;
            }
        }