:root {
            --rzm18-primary: #1a73e8;
            --rzm18-secondary: #4285f4;
            --rzm18-success: #34a853;
            --rzm18-warning: #fbbc05;
            --rzm18-danger: #ea4335;
            --rzm18-text-main: #202124;
            --rzm18-text-light: #5f6368;
            --rzm18-bg-gray: #f8f9fa;
            --rzm18-white: #ffffff;
            --rzm18-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --rzm18-container-width: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--rzm18-text-main);
            background-color: var(--rzm18-white);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Layout Helpers */
        .rzm18-container {
            max-width: var(--rzm18-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .rzm18-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .rzm18-flex-item {
            min-width: 0;
        }

        /* Typography */
        h1, h2, h3 {
            word-break: keep-all;
            white-space: normal;
            line-height: 1.3;
        }

        p {
            word-break: break-word;
            overflow-wrap: break-word;
            line-height: 1.8;
            color: var(--rzm18-text-light);
        }

        /* Header & Nav */
        .rzm18-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: 0 1px 0 rgba(0,0,0,0.05);
        }

        .rzm18-nav-container {
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

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

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

        .rzm18-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
        }

        .rzm18-nav-menu li a {
            text-decoration: none;
            color: var(--rzm18-text-light);
            font-size: 15px;
            padding: 8px 16px;
            border-radius: 20px;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .rzm18-nav-menu li a:hover {
            background-color: rgba(26, 115, 232, 0.05);
            color: var(--rzm18-primary);
        }

        .rzm18-nav-menu li a.rzm18-active {
            background-color: var(--rzm18-primary);
            color: var(--rzm18-white);
        }

        /* Hero Section - Unique Layout */
        .rzm18-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 80% 20%, rgba(66, 133, 244, 0.05) 0%, rgba(255, 255, 255, 0) 50%);
            text-align: center;
            position: relative;
        }

        .rzm18-hero-badge {
            display: inline-block;
            background: rgba(26, 115, 232, 0.1);
            color: var(--rzm18-primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .rzm18-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--rzm18-text-main);
            letter-spacing: -0.02em;
        }

        .rzm18-hero p {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        .rzm18-sync-visual {
            margin-top: 64px;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 48px;
        }

        .rzm18-device-node {
            width: 120px;
            height: 120px;
            background: var(--rzm18-white);
            border-radius: 24px;
            box-shadow: var(--rzm18-shadow);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 14px;
            transition: transform 0.3s ease;
        }

        .rzm18-device-node:hover {
            transform: translateY(-10px);
        }

        .rzm18-sync-line {
            height: 2px;
            width: 60px;
            background: linear-gradient(90deg, var(--rzm18-primary), var(--rzm18-success));
            position: relative;
        }

        /* Features Section */
        .rzm18-section {
            padding: 96px 0;
        }

        .rzm18-section-bg {
            background-color: var(--rzm18-bg-gray);
        }

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

        .rzm18-card {
            background: var(--rzm18-white);
            padding: 48px;
            border-radius: 24px;
            transition: all 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .rzm18-card:hover {
            box-shadow: 0 20px 40px rgba(0,0,0,0.06);
            transform: translateY(-5px);
        }

        .rzm18-card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
        }

        .rzm18-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
        }

        /* Security Matrix Section */
        .rzm18-matrix {
            background: #101012;
            color: #fff;
            padding: 80px 0;
            border-radius: 32px;
            margin: 48px 24px;
        }

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

        .rzm18-matrix-header h2 {
            color: #fff;
            font-size: 32px;
            margin-bottom: 16px;
        }

        .rzm18-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            padding: 0 48px;
        }

        .rzm18-matrix-item {
            border-left: 2px solid var(--rzm18-primary);
            padding-left: 24px;
            margin-bottom: 32px;
        }

        .rzm18-matrix-label {
            font-size: 12px;
            text-transform: uppercase;
            color: var(--rzm18-primary);
            font-weight: 700;
            margin-bottom: 8px;
        }

        .rzm18-matrix-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .rzm18-matrix-desc {
            font-size: 14px;
            color: #9aa0a6;
        }

        /* Footer */
        .rzm18-footer {
            background: var(--rzm18-bg-gray);
            padding: 64px 0;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .rzm18-footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .rzm18-footer-brand {
            font-weight: 700;
            font-size: 20px;
            color: var(--rzm18-text-main);
        }

        .rzm18-footer-links {
            display: flex;
            gap: 24px;
            list-style: none;
        }

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

        /* Responsive */
        @media (max-width: 768px) {
            .rzm18-nav-menu {
                display: none; /* Simplification for mobile */
            }
            .rzm18-hero h1 {
                font-size: 2.5rem;
            }
            .rzm18-sync-visual {
                flex-direction: column;
                gap: 24px;
            }
            .rzm18-sync-line {
                width: 2px;
                height: 40px;
            }
            .rzm18-matrix-grid {
                padding: 0 24px;
            }
        }