:root {
            --rh3o-primary: #188FFF;
            --rh3o-primary-dark: #0056b3;
            --rh3o-secondary: #2D3E50;
            --rh3o-accent: #00D1FF;
            --rh3o-bg-light: #F8FAFC;
            --rh3o-text-main: #1E293B;
            --rh3o-text-muted: #64748B;
            --rh3o-white: #FFFFFF;
            --rh3o-error: #EF4444;
            --rh3o-warning: #F59E0B;
            --rh3o-success: #10B981;
            --rh3o-shadow: 0 10px 30px -10px rgba(0,0,0,0.1);
            --rh3o-radius: 16px;
            --rh3o-container: 1100px;
        }

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

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

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

        .rh3o-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .rh3o-flex-item {
            min-width: 0;
        }

        /* Typography */
        h1, h2, h3, h4 {
            line-height: 1.2;
            margin-bottom: 1rem;
            white-space: normal;
            font-weight: 700;
        }

        p {
            margin-bottom: 1.2rem;
            font-size: clamp(1rem, 1.1vw, 1.125rem);
        }

        /* Navigation */
        .rh3o-header {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            box-shadow: 0 4px 20px rgba(0,0,0,0.03);
        }

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

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

        .rh3o-menu {
            display: flex;
            list-style: none;
            gap: 12px;
        }

        .rh3o-menu-link {
            text-decoration: none;
            color: var(--rh3o-text-main);
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-size: 0.95rem;
        }

        .rh3o-menu-link:hover {
            color: var(--rh3o-primary);
            background: rgba(24, 143, 255, 0.05);
        }

        .rh3o-menu-link.rh3o-active {
            background: var(--rh3o-primary);
            color: var(--rh3o-white);
        }

        /* Hero Troubleshooting */
        .rh3o-hero-diag {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #2D3E50 0%, #1a252f 100%);
            color: var(--rh3o-white);
            position: relative;
            overflow: hidden;
        }

        .rh3o-hero-diag::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(24, 143, 255, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }

        .rh3o-hero-content {
            max-width: 800px;
            position: relative;
            z-index: 2;
        }

        .rh3o-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            margin-bottom: 24px;
            background: linear-gradient(to right, #fff, #00D1FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .rh3o-hero-subtitle {
            font-size: 1.25rem;
            opacity: 0.9;
            margin-bottom: 40px;
        }

        /* Error Cards Section */
        .rh3o-section-padding {
            padding: 96px 0;
        }

        .rh3o-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .rh3o-error-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 32px;
        }

        .rh3o-error-card {
            background: var(--rh3o-white);
            padding: 40px;
            border-radius: var(--rh3o-radius);
            box-shadow: var(--rh3o-shadow);
            border: 1px solid rgba(0,0,0,0.03);
            transition: transform 0.3s ease;
        }

        .rh3o-error-card:hover {
            transform: translateY(-8px);
        }

        .rh3o-error-code {
            display: inline-block;
            background: rgba(239, 68, 68, 0.1);
            color: var(--rh3o-error);
            padding: 4px 12px;
            border-radius: 6px;
            font-family: monospace;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .rh3o-error-title {
            font-size: 1.5rem;
            color: var(--rh3o-secondary);
            margin-bottom: 16px;
        }

        .rh3o-solution-list {
            list-style: none;
        }

        .rh3o-solution-item {
            display: flex;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 0.95rem;
        }

        .rh3o-solution-icon {
            color: var(--rh3o-success);
            flex-shrink: 0;
        }

        /* Matrix Table Section */
        .rh3o-matrix-section {
            background: #F1F5F9;
            border-radius: 32px;
            padding: 64px;
            margin-top: 48px;
        }

        .rh3o-table-container {
            overflow-x: auto;
            background: var(--rh3o-white);
            border-radius: 16px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }

        .rh3o-matrix-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        .rh3o-matrix-table th {
            background: var(--rh3o-secondary);
            color: var(--rh3o-white);
            text-align: left;
            padding: 20px;
            font-weight: 600;
        }

        .rh3o-matrix-table td {
            padding: 20px;
            border-bottom: 1px solid #E2E8F0;
            vertical-align: top;
        }

        .rh3o-tag {
            display: inline-block;
            padding: 4px 10px;
            background: #E0F2FE;
            color: var(--rh3o-primary);
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        /* Diagnostic Steps */
        .rh3o-diag-steps {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 48px;
        }

        .rh3o-step-item {
            flex: 1;
            min-width: 250px;
            background: var(--rh3o-white);
            padding: 32px;
            border-radius: var(--rh3o-radius);
            border-left: 4px solid var(--rh3o-primary);
        }

        .rh3o-step-num {
            font-size: 2rem;
            font-weight: 800;
            color: rgba(24, 143, 255, 0.2);
            margin-bottom: 8px;
        }

        /* Footer */
        .rh3o-footer {
            background: var(--rh3o-secondary);
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
        }

        .rh3o-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .rh3o-footer-brand h3 {
            color: var(--rh3o-white);
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .rh3o-footer-links h4 {
            color: var(--rh3o-white);
            margin-bottom: 24px;
        }

        .rh3o-footer-links ul {
            list-style: none;
        }

        .rh3o-footer-links li {
            margin-bottom: 12px;
        }

        .rh3o-footer-links a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s;
        }

        .rh3o-footer-links a:hover {
            color: var(--rh3o-primary);
        }

        .rh3o-footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 40px;
            text-align: center;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .rh3o-menu {
                display: none; /* In a real site, implement a burger menu */
            }
            .rh3o-matrix-section {
                padding: 32px 16px;
            }
        }

        @media (max-width: 768px) {
            .rh3o-hero-diag {
                padding: 120px 0 60px;
                text-align: center;
            }
            .rh3o-hero-content {
                margin: 0 auto;
            }
            .rh3o-diag-steps {
                flex-direction: column;
            }
            .rh3o-error-grid {
                grid-template-columns: 1fr;
            }
        }