:root {
            --rzm18-bg-dark: #202124;
            --rzm18-bg-surface: #292a2d;
            --rzm18-bg-card: #35363a;
            --rzm18-primary: #8ab4f8;
            --rzm18-text-main: #e8eaed;
            --rzm18-text-dim: #9aa0a6;
            --rzm18-accent: #f8f9fa;
            --rzm18-border: rgba(255, 255, 255, 0.1);
            --rzm18-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --rzm18-container-width: 1100px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--rzm18-bg-dark);
            color: var(--rzm18-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 布局与容器 */
        .rzm18-container {
            max-width: var(--rzm18-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航菜单 */
        .rzm18-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(32, 33, 36, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--rzm18-border);
        }

        .rzm18-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            min-width: 0;
        }

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

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

        .rzm18-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .rzm18-nav-menu li {
            min-width: 0;
        }

        .rzm18-nav-link {
            text-decoration: none;
            color: var(--rzm18-text-dim);
            font-size: clamp(0.875rem, 1vw, 1rem);
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--rzm18-transition);
            word-break: break-word;
        }

        .rzm18-nav-link:hover {
            color: var(--rzm18-primary);
            background: rgba(138, 180, 248, 0.1);
        }

        .rzm18-nav-link.rzm18-active {
            color: var(--rzm18-primary);
            background: rgba(138, 180, 248, 0.15);
        }

        /* Hero 区块 - 独特卡片式布局 */
        .rzm18-hero-section {
            padding: 160px 0 96px;
            text-align: center;
            background: radial-gradient(circle at center, #2d2e31 0%, #202124 100%);
        }

        .rzm18-hero-card {
            background: var(--rzm18-bg-surface);
            border: 1px solid var(--rzm18-border);
            border-radius: 32px;
            padding: 64px 32px;
            max-width: 800px;
            margin: 0 auto;
            box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
            transition: var(--rzm18-transition);
        }

        .rzm18-hero-card:hover {
            transform: translateY(-8px);
            border-color: var(--rzm18-primary);
        }

        .rzm18-incognito-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 32px;
            background: var(--rzm18-bg-card);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .rzm18-incognito-icon svg {
            width: 48px;
            height: 48px;
            fill: var(--rzm18-text-main);
        }

        .rzm18-hero-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 700;
            margin-bottom: 24px;
            line-height: 1.2;
            color: var(--rzm18-accent);
            white-space: normal;
        }

        .rzm18-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--rzm18-text-dim);
            max-width: 600px;
            margin: 0 auto 40px;
            word-break: break-word;
        }

        .rzm18-btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
            min-width: 0;
        }

        .rzm18-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--rzm18-transition);
            min-width: 160px;
        }

        .rzm18-btn-primary {
            background: var(--rzm18-primary);
            color: var(--rzm18-bg-dark);
        }

        .rzm18-btn-primary:hover {
            background: #aecbff;
            box-shadow: 0 0 20px rgba(138, 180, 248, 0.4);
        }

        .rzm18-btn-outline {
            border: 1px solid var(--rzm18-text-dim);
            color: var(--rzm18-text-main);
        }

        .rzm18-btn-outline:hover {
            border-color: var(--rzm18-accent);
            background: rgba(255, 255, 255, 0.05);
        }

        /* 矩阵防御区块 */
        .rzm18-matrix-section {
            padding: 96px 0;
            background-color: var(--rzm18-bg-dark);
        }

        .rzm18-section-label {
            display: block;
            color: var(--rzm18-primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-size: 0.875rem;
            margin-bottom: 16px;
            text-align: center;
        }

        .rzm18-section-title {
            font-size: clamp(1.75rem, 4vw, 2.5rem);
            text-align: center;
            margin-bottom: 64px;
            color: var(--rzm18-accent);
        }

        .rzm18-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .rzm18-matrix-card {
            background: var(--rzm18-bg-surface);
            padding: 40px;
            border-radius: 24px;
            border: 1px solid var(--rzm18-border);
            display: flex;
            flex-direction: column;
            transition: var(--rzm18-transition);
            min-width: 0;
        }

        .rzm18-matrix-card:hover {
            border-color: var(--rzm18-primary);
            background: #2f3033;
        }

        .rzm18-matrix-layer {
            font-weight: 700;
            font-size: 1.25rem;
            margin-bottom: 16px;
            color: var(--rzm18-primary);
        }

        .rzm18-matrix-desc {
            color: var(--rzm18-text-dim);
            margin-bottom: 24px;
            flex-grow: 1;
            word-break: break-word;
        }

        .rzm18-matrix-badge {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(138, 180, 248, 0.1);
            color: var(--rzm18-primary);
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        /* 图文交替区块 */
        .rzm18-feature-section {
            padding: 96px 0;
            background: var(--rzm18-bg-surface);
        }

        .rzm18-feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
            min-width: 0;
        }

        .rzm18-feature-row:last-child {
            margin-bottom: 0;
        }

        .rzm18-feature-row.rzm18-reverse {
            flex-direction: row-reverse;
        }

        .rzm18-feature-content {
            flex: 1;
            min-width: 320px;
        }

        .rzm18-feature-graphic {
            flex: 1;
            min-width: 320px;
            background: var(--rzm18-bg-card);
            height: 360px;
            border-radius: 24px;
            position: relative;
            overflow: hidden;
            border: 1px solid var(--rzm18-border);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 纯CSS视觉图形：极速/同步/安全 */
        .rzm18-visual-box {
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(138, 180, 248, 0.05) 0%, rgba(138, 180, 248, 0.2) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .rzm18-feature-title {
            font-size: 2rem;
            margin-bottom: 24px;
            color: var(--rzm18-accent);
        }

        .rzm18-feature-desc {
            font-size: 1.125rem;
            color: var(--rzm18-text-dim);
            line-height: 1.8;
            word-break: break-word;
        }

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

        .rzm18-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .rzm18-footer-brand {
            grid-column: span 2;
        }

        .rzm18-brand-text {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--rzm18-accent);
        }

        .rzm18-footer-desc {
            color: var(--rzm18-text-dim);
            max-width: 300px;
        }

        .rzm18-footer-title {
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--rzm18-text-main);
        }

        .rzm18-footer-links {
            list-style: none;
        }

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

        .rzm18-footer-links a {
            text-decoration: none;
            color: var(--rzm18-text-dim);
            transition: var(--rzm18-transition);
        }

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

        .rzm18-footer-bottom {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid var(--rzm18-border);
            color: var(--rzm18-text-dim);
            font-size: 0.875rem;
        }

        /* 响应式断点 */
        @media (max-width: 992px) {
            .rzm18-footer-brand {
                grid-column: span 1;
            }
        }

        @media (max-width: 768px) {
            .rzm18-nav-menu {
                display: none; /* 简化演示，实际可做汉堡菜单 */
            }
            .rzm18-hero-section {
                padding: 120px 0 64px;
            }
            .rzm18-feature-row, .rzm18-feature-row.rzm18-reverse {
                flex-direction: column;
                gap: 32px;
            }
            .rzm18-feature-graphic {
                height: 240px;
                width: 100%;
            }
            .rzm18-matrix-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 动态区块标记 */
        [data-dynamic-content="latest-articles"] {
            border-left: 4px solid var(--rzm18-primary);
        }
    


        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }