:root {
            --h0u505-chrome-blue: #4285F4;
            --h0u505-chrome-red: #EA4335;
            --h0u505-chrome-yellow: #FBBC05;
            --h0u505-chrome-green: #34A853;
            --h0u505-text-primary: #202124;
            --h0u505-text-secondary: #5f6368;
            --h0u505-bg-light: #ffffff;
            --h0u505-bg-soft: #f8f9fa;
            --h0u505-border: #dadce0;
            --h0u505-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --h0u505-radius: 16px;
            --h0u505-container-width: 1100px;
        }

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

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--h0u505-text-primary);
            line-height: 1.6;
            background-color: var(--h0u505-bg-light);
            word-break: break-word;
            overflow-x: hidden;
        }

        /* Navigation */
        .h0u505-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid var(--h0u505-border);
            transition: box-shadow 0.3s ease;
        }

        .h0u505-nav-container {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
        }

        .h0u505-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .h0u505-logo img {
            height: 40px;
            display: block;
        }

        .h0u505-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .h0u505-menu-item a {
            text-decoration: none;
            color: var(--h0u505-text-secondary);
            font-size: 0.95rem;
            padding: 8px 12px;
            border-radius: 20px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .h0u505-menu-item a:hover {
            background: var(--h0u505-bg-soft);
            color: var(--h0u505-chrome-blue);
        }

        .h0u505-menu-item.h0u505-active a {
            background: rgba(66, 133, 244, 0.1);
            color: var(--h0u505-chrome-blue);
            font-weight: 600;
        }

        /* Hero Section */
        .h0u505-hero {
            padding: 160px 24px 96px;
            background: radial-gradient(circle at top right, rgba(66, 133, 244, 0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(52, 168, 83, 0.05), transparent);
            text-align: center;
            min-height: 60vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .h0u505-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--h0u505-text-primary);
            max-width: 900px;
        }

        .h0u505-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--h0u505-text-secondary);
            max-width: 750px;
            margin-bottom: 48px;
            line-height: 1.6;
        }

        .h0u505-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            min-width: 0;
        }

        .h0u505-btn {
            display: inline-block;
            padding: 16px 32px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            min-width: 0;
        }

        .h0u505-btn-primary {
            background: var(--h0u505-chrome-blue);
            color: white;
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.3);
        }

        .h0u505-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.4);
        }

        /* Cleaning Guide Section */
        .h0u505-section {
            padding: 96px 24px;
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
        }

        .h0u505-grid-clean {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .h0u505-clean-card {
            background: var(--h0u505-bg-soft);
            padding: 40px;
            border-radius: var(--h0u505-radius);
            border: 1px solid var(--h0u505-border);
            transition: all 0.3s ease;
            min-width: 0;
        }

        .h0u505-clean-card:hover {
            background: #fff;
            box-shadow: var(--h0u505-shadow);
            transform: translateY(-8px);
        }

        .h0u505-step-num {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: var(--h0u505-chrome-blue);
            color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            font-weight: bold;
            margin-bottom: 24px;
        }

        /* Security Matrix Section */
        .h0u505-matrix-bg {
            background-color: #202124;
            color: #fff;
        }

        .h0u505-matrix-title {
            text-align: center;
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 64px;
        }

        .h0u505-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            min-width: 0;
        }

        .h0u505-matrix-item {
            border: 1px solid rgba(255,255,255,0.1);
            padding: 32px;
            border-radius: var(--h0u505-radius);
            background: rgba(255,255,255,0.02);
            transition: background 0.3s ease;
        }

        .h0u505-matrix-item:hover {
            background: rgba(255,255,255,0.05);
        }

        .h0u505-layer-name {
            color: var(--h0u505-chrome-green);
            font-weight: bold;
            margin-bottom: 12px;
            display: block;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-size: 0.85rem;
        }

        /* Timeline Section */
        .h0u505-timeline {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            padding: 48px 0;
        }

        .h0u505-timeline-item {
            margin-bottom: 48px;
            padding-left: 32px;
            border-left: 3px solid var(--h0u505-chrome-yellow);
            position: relative;
            min-width: 0;
        }

        .h0u505-timeline-item::before {
            content: "";
            position: absolute;
            left: -11px;
            top: 0;
            width: 18px;
            height: 18px;
            background: var(--h0u505-bg-light);
            border: 4px solid var(--h0u505-chrome-yellow);
            border-radius: 50%;
        }

        .h0u505-year {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--h0u505-chrome-blue);
            margin-bottom: 8px;
            display: block;
        }

        /* Footer */
        .h0u505-footer {
            background: var(--h0u505-bg-soft);
            border-top: 1px solid var(--h0u505-border);
            padding: 64px 24px;
        }

        .h0u505-footer-content {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .h0u505-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .h0u505-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--h0u505-text-primary);
        }

        .h0u505-footer-links {
            flex: 2 1 400px;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            min-width: 0;
        }

        .h0u505-footer-col {
            flex: 1 1 150px;
            min-width: 0;
        }

        .h0u505-footer-col h4 {
            margin-bottom: 20px;
            font-size: 0.9rem;
            text-transform: uppercase;
            color: var(--h0u505-text-secondary);
        }

        .h0u505-footer-col ul {
            list-style: none;
        }

        .h0u505-footer-col li {
            margin-bottom: 12px;
        }

        .h0u505-footer-col a {
            text-decoration: none;
            color: var(--h0u505-text-secondary);
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        .h0u505-footer-col a:hover {
            color: var(--h0u505-chrome-blue);
        }

        .h0u505-copyright {
            max-width: var(--h0u505-container-width);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid var(--h0u505-border);
            text-align: center;
            font-size: 0.85rem;
            color: var(--h0u505-text-secondary);
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .h0u505-nav-container {
                justify-content: center;
                gap: 16px;
            }
            .h0u505-menu {
                justify-content: center;
            }
            .h0u505-hero {
                padding-top: 140px;
            }
            .h0u505-grid-clean, .h0u505-matrix-grid {
                grid-template-columns: 1fr;
            }
        }