:root {
            --hjuo-primary: #4285F4;
            --hjuo-secondary: #34A853;
            --hjuo-accent: #FBBC05;
            --hjuo-danger: #EA4335;
            --hjuo-text-dark: #202124;
            --hjuo-text-light: #5f6368;
            --hjuo-bg-light: #f8f9fa;
            --hjuo-white: #ffffff;
            --hjuo-spacing-unit: 8px;
            --hjuo-container-width: 1320px;
        }

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

        body {
            font-family: "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--hjuo-text-dark);
            line-height: 1.6;
            background-color: var(--hjuo-white);
            word-break: break-word;
            overflow-x: hidden;
        }

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

        p {
            line-height: 1.8;
            margin-bottom: calc(var(--hjuo-spacing-unit) * 2);
        }

        .hjuo-fluid-title {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            margin-bottom: calc(var(--hjuo-spacing-unit) * 3);
        }

        .hjuo-fluid-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.5rem);
            color: var(--hjuo-text-light);
            max-width: 800px;
        }

        /* Layout Helpers */
        .hjuo-container {
            max-width: var(--hjuo-container-width);
            margin: 0 auto;
            padding: 0 calc(var(--hjuo-spacing-unit) * 3);
        }

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

        .hjuo-flex > * {
            min-width: 0;
        }

        /* Navigation */
        .hjuo-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

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

        .hjuo-logo img {
            height: 32px;
            display: block;
        }

        .hjuo-nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
        }

        .hjuo-nav-link {
            text-decoration: none;
            color: var(--hjuo-text-light);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s ease;
            position: relative;
            padding: 8px 0;
        }

        .hjuo-nav-link:hover {
            color: var(--hjuo-primary);
        }

        .hjuo-nav-link.hjuo-active {
            color: var(--hjuo-primary);
        }

        .hjuo-nav-link.hjuo-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--hjuo-primary);
        }

        /* Hero Section */
        .hjuo-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.05) 0%, transparent 40%);
        }

        .hjuo-hero-content {
            align-items: center;
            gap: 48px;
        }

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

        .hjuo-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
        }

        .hjuo-main-visual {
            width: 100%;
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.1);
            transform: perspective(1000px) rotateY(-5deg);
            transition: transform 0.5s ease;
        }

        .hjuo-main-visual:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        /* Buttons */
        .hjuo-btn-group {
            display: flex;
            gap: 16px;
            margin-top: 40px;
        }

        .hjuo-btn {
            display: inline-block;
            padding: 16px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
        }

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

        .hjuo-btn-primary:hover {
            background: #3367d6;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.4);
        }

        /* Engine Architecture Breakdown */
        .hjuo-tech-section {
            padding: 96px 0;
            background: var(--hjuo-bg-light);
        }

        .hjuo-tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .hjuo-tech-card {
            background: var(--hjuo-white);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .hjuo-tech-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
        }

        .hjuo-tech-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--hjuo-primary);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .hjuo-tech-title {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--hjuo-text-dark);
        }

        /* User Flow Section */
        .hjuo-flow-section {
            padding: 96px 0;
        }

        .hjuo-flow-item {
            display: flex;
            align-items: center;
            gap: 64px;
            margin-bottom: 80px;
        }

        .hjuo-flow-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .hjuo-flow-image {
            flex: 1;
            min-width: 300px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .hjuo-flow-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .hjuo-flow-info {
            flex: 1;
            min-width: 300px;
        }

        .hjuo-flow-step {
            font-size: 48px;
            font-weight: 800;
            color: rgba(66, 133, 244, 0.1);
            margin-bottom: 8px;
        }

        /* Footer */
        .hjuo-footer {
            background: #1a1a1a;
            color: #ffffff;
            padding: 80px 0 40px;
        }

        .hjuo-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 48px;
            margin-bottom: 40px;
        }

        .hjuo-footer-brand {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .hjuo-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
            color: rgba(255,255,255,0.6);
        }

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

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

        .hjuo-footer-links a {
            color: #ffffff;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s ease;
        }

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

        .hjuo-copyright {
            text-align: center;
            font-size: 14px;
            color: rgba(255,255,255,0.4);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hjuo-nav-menu {
                display: none; /* In a real scenario, this would be a hamburger menu */
            }

            .hjuo-flow-item, .hjuo-flow-item:nth-child(even) {
                flex-direction: column;
                gap: 32px;
            }

            .hjuo-hero-content {
                flex-direction: column;
                text-align: center;
            }

            .hjuo-btn-group {
                justify-content: center;
            }

            .hjuo-main-visual {
                transform: none;
            }
        }