:root {
            --rh3o-primary: #1880c4;
            --rh3o-primary-dark: #0d47a1;
            --rh3o-accent: #00d1b2;
            --rh3o-bg-light: #f8fafc;
            --rh3o-bg-white: #ffffff;
            --rh3o-text-main: #1e293b;
            --rh3o-text-muted: #64748b;
            --rh3o-border: #e2e8f0;
            --rh3o-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            --rh3o-container-width: 1100px;
        }

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

        body {
            font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--rh3o-text-main);
            background-color: var(--rh3o-bg-light);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* Fluid Typography */
        h1 { font-size: clamp(2rem, 5vw + 1rem, 3.5rem); line-height: 1.1; font-weight: 800; }
        h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.2rem); line-height: 1.2; font-weight: 700; margin-bottom: 24px; }
        h3 { font-size: clamp(1.2rem, 2vw + 0.3rem, 1.5rem); line-height: 1.3; font-weight: 600; }
        p { font-size: clamp(1rem, 0.5vw + 0.8rem, 1.1rem); margin-bottom: 16px; word-break: break-word; overflow-wrap: break-word; }

        .rh3o-container {
            max-width: var(--rh3o-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Navigation */
        .rh3o-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--rh3o-border);
            transition: all 0.3s ease;
        }

        .rh3o-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            min-width: 0;
        }

        .rh3o-logo {
            flex-shrink: 0;
        }

        .rh3o-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .rh3o-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .rh3o-menu-item a {
            text-decoration: none;
            color: var(--rh3o-text-main);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.2s ease;
        }

        .rh3o-menu-item a:hover {
            color: var(--rh3o-primary);
            background: rgba(24, 128, 196, 0.05);
        }

        .rh3o-menu-item.rh3o-active a {
            color: var(--rh3o-primary);
            background: rgba(24, 128, 196, 0.1);
        }

        /* Hero Section - Unique Stacked Layout */
        .rh3o-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at 90% 10%, rgba(24, 128, 196, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(0, 209, 178, 0.05) 0%, transparent 40%);
            position: relative;
            overflow: hidden;
        }

        .rh3o-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            min-width: 0;
        }

        .rh3o-hero-text {
            flex: 1;
            min-width: 320px;
        }

        .rh3o-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
            display: flex;
            justify-content: center;
        }

        /* CSS-based Virtual Stack Graphic */
        .rh3o-stack-card {
            width: 280px;
            height: 180px;
            background: var(--rh3o-bg-white);
            border: 1px solid var(--rh3o-border);
            border-radius: 16px;
            box-shadow: var(--rh3o-shadow);
            position: relative;
            transform: perspective(1000px) rotateX(20deg) rotateY(-10deg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--rh3o-primary);
        }

        .rh3o-stack-card::before, .rh3o-stack-card::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 16px;
            border: 1px solid var(--rh3o-border);
            background: rgba(255, 255, 255, 0.6);
            z-index: -1;
            transition: transform 0.4s ease;
        }

        .rh3o-stack-card::before { transform: translate(20px, -20px); }
        .rh3o-stack-card::after { transform: translate(40px, -40px); opacity: 0.3; }

        .rh3o-stack-card:hover::before { transform: translate(30px, -30px); }
        .rh3o-stack-card:hover::after { transform: translate(60px, -60px); }

        .rh3o-badge {
            display: inline-block;
            padding: 4px 12px;
            background: var(--rh3o-primary);
            color: white;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* Download Section */
        .rh3o-section {
            padding: 96px 0;
            min-width: 0;
        }

        .rh3o-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .rh3o-card {
            background: var(--rh3o-bg-white);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid var(--rh3o-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .rh3o-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
            border-color: var(--rh3o-primary);
        }

        .rh3o-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: var(--rh3o-primary);
            color: white;
            text-decoration: none;
            border-radius: 10px;
            font-weight: 600;
            transition: all 0.3s ease;
            margin-top: auto;
            border: none;
            cursor: pointer;
        }

        .rh3o-btn:hover {
            background: var(--rh3o-primary-dark);
            box-shadow: 0 4px 15px rgba(24, 128, 196, 0.3);
        }

        /* Matrix Section */
        .rh3o-matrix-section {
            background: var(--rh3o-text-main);
            color: white;
            border-radius: 40px;
            margin: 48px 0;
            padding: 80px 48px;
        }

        .rh3o-matrix-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 48px;
        }

        .rh3o-matrix-item {
            flex: 1;
            min-width: 280px;
            background: rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .rh3o-matrix-item h3 {
            color: var(--rh3o-accent);
            margin-bottom: 16px;
        }

        .rh3o-matrix-tag {
            font-size: 0.8rem;
            color: var(--rh3o-text-muted);
            margin-top: 16px;
            display: block;
        }

        /* Footer */
        .rh3o-footer {
            padding: 64px 0;
            background: var(--rh3o-bg-white);
            border-top: 1px solid var(--rh3o-border);
            text-align: center;
        }

        .rh3o-footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--rh3o-primary);
            margin-bottom: 16px;
        }

        .rh3o-footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
            margin-bottom: 32px;
        }

        .rh3o-footer-links a {
            color: var(--rh3o-text-muted);
            text-decoration: none;
            font-size: 0.9rem;
        }

        .rh3o-copyright {
            color: var(--rh3o-text-muted);
            font-size: 0.85rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .rh3o-nav-wrapper {
                height: auto;
                padding: 16px 0;
                flex-direction: column;
                gap: 16px;
            }
            .rh3o-menu {
                justify-content: center;
            }
            .rh3o-hero {
                padding-top: 200px;
                text-align: center;
            }
            .rh3o-hero-visual {
                display: none;
            }
            .rh3o-matrix-section {
                padding: 48px 24px;
                border-radius: 0;
            }
        }