:root {
            --h0u505-primary: #4285F4;
            --h0u505-red: #EA4335;
            --h0u505-yellow: #FBBC05;
            --h0u505-green: #34A853;
            --h0u505-text: #202124;
            --h0u505-text-light: #5f6368;
            --h0u505-bg: #ffffff;
            --h0u505-bg-alt: #f8f9fa;
            --h0u505-border: #dadce0;
            --h0u505-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --h0u505-container-width: 1100px;
        }

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

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

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            margin-bottom: 1rem;
            white-space: normal;
            word-break: keep-all;
        }

        h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; }
        h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 600; }
        p { font-size: clamp(1rem, 1.5vw + 0.5rem, 1.125rem); line-height: 1.8; margin-bottom: 1.5rem; word-break: break-word; }

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

        .h0u505-nav-container {
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
        }

        .h0u505-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .h0u505-logo img {
            height: 32px;
            width: auto;
        }

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

        .h0u505-nav-item a {
            text-decoration: none;
            color: var(--h0u505-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 4px;
            transition: var(--h0u505-transition);
        }

        .h0u505-nav-item a:hover {
            background-color: var(--h0u505-bg-alt);
            color: var(--h0u505-primary);
        }

        .h0u505-nav-item.active a {
            color: var(--h0u505-primary);
            background-color: #e8f0fe;
        }

        /* Hero Section */
        .h0u505-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #f8f9fa 0%, #e8f0fe 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .h0u505-hero::after {
            content: '';
            position: absolute;
            bottom: -50px;
            left: 50%;
            transform: translateX(-50%);
            width: 120%;
            height: 100px;
            background: var(--h0u505-bg);
            border-radius: 50% 50% 0 0;
        }

        .h0u505-hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .h0u505-badge {
            display: inline-block;
            padding: 6px 16px;
            background: #fff;
            border: 1px solid var(--h0u505-border);
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--h0u505-primary);
            margin-bottom: 24px;
        }

        /* Diagnostic Tools Grid */
        .h0u505-section {
            padding: 80px 24px;
            max-width: var(--h0u505-container-width);
            margin: 0 auto;
        }

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

        .h0u505-card {
            background: var(--h0u505-bg);
            border: 1px solid var(--h0u505-border);
            border-radius: 16px;
            padding: 32px;
            transition: var(--h0u505-transition);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .h0u505-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.08);
            border-color: var(--h0u505-primary);
        }

        .h0u505-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--h0u505-bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            font-weight: bold;
            font-size: 1.5rem;
        }

        /* Security Matrix Layout */
        .h0u505-matrix-container {
            background: var(--h0u505-bg-alt);
            border-radius: 24px;
            padding: 48px;
            margin-top: 48px;
        }

        .h0u505-matrix-item {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            padding: 32px 0;
            border-bottom: 1px solid var(--h0u505-border);
            min-width: 0;
        }

        .h0u505-matrix-item:last-child { border-bottom: none; }

        .h0u505-matrix-info {
            flex: 1;
            min-width: 280px;
        }

        .h0u505-matrix-tag {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--h0u505-green);
            font-weight: 700;
            margin-bottom: 8px;
            display: block;
        }

        /* Future Vision Timeline */
        .h0u505-timeline {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 64px;
            position: relative;
        }

        .h0u505-milestone {
            flex: 1;
            min-width: 260px;
            position: relative;
            padding-left: 24px;
            border-left: 3px solid var(--h0u505-primary);
        }

        .h0u505-year {
            font-size: 2rem;
            font-weight: 800;
            color: var(--h0u505-primary);
            opacity: 0.3;
            margin-bottom: 8px;
        }

        /* CTA Section */
        .h0u505-cta {
            background: var(--h0u505-text);
            color: #fff;
            border-radius: 24px;
            padding: 64px;
            text-align: center;
            margin: 80px auto;
            max-width: calc(var(--h0u505-container-width) - 48px);
        }

        .h0u505-btn {
            display: inline-block;
            padding: 16px 32px;
            background: var(--h0u505-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--h0u505-transition);
            border: none;
            cursor: pointer;
        }

        .h0u505-btn:hover {
            background: #1a73e8;
            box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
        }

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

        .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;
            min-width: 240px;
        }

        .h0u505-footer-brand h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--h0u505-text);
        }

        .h0u505-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2;
        }

        .h0u505-link-group {
            min-width: 140px;
        }

        .h0u505-link-group ul {
            list-style: none;
        }

        .h0u505-link-group li {
            margin-bottom: 12px;
        }

        .h0u505-link-group a {
            text-decoration: none;
            color: var(--h0u505-text-light);
            font-size: 0.9rem;
            transition: var(--h0u505-transition);
        }

        .h0u505-link-group a:hover {
            color: var(--h0u505-primary);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .h0u505-nav-menu {
                display: none; /* In real scenarios, a hamburger menu would be here */
            }
            .h0u505-hero { padding-top: 120px; }
            .h0u505-grid { grid-template-columns: 1fr; }
            .h0u505-matrix-container, .h0u505-cta { padding: 32px 24px; }
        }