:root {
            --hhx9et-primary: #1880C4;
            --hhx9et-secondary: #005696;
            --hhx9et-accent: #f39c12;
            --hhx9et-bg: #f8fafc;
            --hhx9et-text: #2c3e50;
            --hhx9et-light-text: #5d6d7e;
            --hhx9et-white: #ffffff;
            --hhx9et-card-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --hhx9et-container-width: 1300px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--hhx9et-bg);
            color: var(--hhx9et-text);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Typography */
        h1, h2, h3, h4 {
            line-height: 1.2;
            color: var(--hhx9et-secondary);
            word-break: keep-all;
            white-space: normal;
        }

        h1 { font-size: clamp(2rem, 5vw + 1rem, 3.5rem); font-weight: 800; margin-bottom: 24px; }
        h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.2rem); margin-bottom: 32px; position: relative; padding-bottom: 12px; }
        h2::after { content: ''; position: absolute; bottom: 0; left: 0; width: 60px; height: 4px; background: var(--hhx9et-primary); border-radius: 2px; }
        p { font-size: clamp(1rem, 2vw + 0.5rem, 1.125rem); margin-bottom: 16px; word-break: break-word; overflow-wrap: break-word; }

        /* Layout Helpers */
        .hhx9et-container {
            max-width: var(--hhx9et-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .hhx9et-flex {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
        }

        .hhx9et-flex-item {
            flex: 1;
            min-width: 0;
        }

        /* Navigation */
        .hhx9et-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .hhx9et-nav-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
            max-width: var(--hhx9et-container-width);
            margin: 0 auto;
        }

        .hhx9et-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .hhx9et-logo img {
            height: 45px;
            width: auto;
            display: block;
        }

        .hhx9et-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 12px;
        }

        .hhx9et-nav-link {
            text-decoration: none;
            color: var(--hhx9et-text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .hhx9et-nav-link:hover {
            color: var(--hhx9et-primary);
            background: rgba(24, 128, 196, 0.05);
        }

        .hhx9et-nav-link.active {
            color: var(--hhx9et-white);
            background: var(--hhx9et-primary);
            box-shadow: 0 4px 12px rgba(24, 128, 196, 0.2);
        }

        /* Hero Section - Unique Diagonal Split */
        .hhx9et-hero {
            position: relative;
            background: var(--hhx9et-secondary);
            color: var(--hhx9et-white);
            padding: 120px 0 160px;
            overflow: hidden;
        }

        .hhx9et-hero-bg {
            position: absolute;
            top: 0;
            right: 0;
            width: 55%;
            height: 100%;
            object-fit: cover;
            opacity: 0.4;
            mask-image: linear-gradient(to left, rgba(0,0,0,1), transparent);
        }

        .hhx9et-hero-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
        }

        .hhx9et-hero-subtitle {
            color: rgba(255,255,255,0.8);
            margin-bottom: 40px;
        }

        .hhx9et-btn {
            display: inline-block;
            padding: 16px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .hhx9et-btn-primary {
            background: var(--hhx9et-primary);
            color: var(--hhx9et-white);
            box-shadow: 0 10px 20px rgba(24, 128, 196, 0.3);
        }

        .hhx9et-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(24, 128, 196, 0.4);
        }

        /* Download Options Section */
        .hhx9et-download-grid {
            margin-top: -80px;
            position: relative;
            z-index: 10;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .hhx9et-download-card {
            background: var(--hhx9et-white);
            padding: 40px;
            border-radius: 20px;
            box-shadow: var(--hhx9et-card-shadow);
            transition: transform 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
        }

        .hhx9et-download-card:hover {
            transform: translateY(-10px);
        }

        .hhx9et-card-icon {
            font-size: 3rem;
            margin-bottom: 24px;
            display: block;
        }

        .hhx9et-version-badge {
            display: inline-block;
            padding: 4px 12px;
            background: #e1f0fa;
            color: var(--hhx9et-primary);
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        /* Platform Compatibility Section */
        .hhx9et-section {
            padding: 96px 0;
        }

        .hhx9et-section-alt {
            background-color: #ffffff;
        }

        .hhx9et-platform-img {
            width: 100%;
            border-radius: 24px;
            box-shadow: 20px 20px 60px rgba(0,0,0,0.05);
            object-fit: cover;
        }

        /* Technical Details Section */
        .hhx9et-tech-box {
            background: #f1f7fc;
            border-radius: 24px;
            padding: 48px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .hhx9et-tech-img {
            flex: 1;
            min-width: 300px;
            border-radius: 16px;
            overflow: hidden;
        }

        .hhx9et-tech-img img {
            width: 100%;
            height: auto;
            display: block;
        }

        .hhx9et-tech-info {
            flex: 1.2;
            min-width: 300px;
        }

        .hhx9et-feature-list {
            list-style: none;
            margin-top: 24px;
        }

        .hhx9et-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 16px;
            font-weight: 500;
        }

        .hhx9et-feature-item::before {
            content: '✓';
            color: #27ae60;
            font-weight: bold;
        }

        /* Industry Scenarios Section */
        .hhx9et-scenario-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .hhx9et-scenario-card {
            background: var(--hhx9et-white);
            padding: 32px;
            border-radius: 16px;
            border-left: 6px solid var(--hhx9et-primary);
            box-shadow: 0 4px 15px rgba(0,0,0,0.04);
        }

        .hhx9et-scenario-sector {
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--hhx9et-primary);
            margin-bottom: 8px;
            display: block;
        }

        .hhx9et-config-tag {
            display: inline-block;
            background: #fef9e7;
            color: #9a7d0a;
            padding: 6px 14px;
            border-radius: 6px;
            font-size: 0.85rem;
            margin-top: 16px;
            border: 1px solid #f9e79f;
        }

        /* Footer */
        .hhx9et-footer {
            background: #1a252f;
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
        }

        .hhx9et-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 60px;
        }

        .hhx9et-footer-brand {
            color: #fff;
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 24px;
        }

        .hhx9et-footer-links h4 {
            color: #fff;
            margin-bottom: 24px;
        }

        .hhx9et-footer-links ul {
            list-style: none;
        }

        .hhx9et-footer-links li {
            margin-bottom: 12px;
        }

        .hhx9et-footer-links a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            transition: color 0.3s;
        }

        .hhx9et-footer-links a:hover {
            color: var(--hhx9et-primary);
        }

        .hhx9et-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hhx9et-hero-bg { width: 100%; opacity: 0.2; mask-image: none; background: linear-gradient(to bottom, rgba(0,0,0,0.5), var(--hhx9et-secondary)); }
            .hhx9et-hero { text-align: center; }
            .hhx9et-hero-content { margin: 0 auto; }
        }

        @media (max-width: 768px) {
            .hhx9et-nav-menu { display: none; } /* Simplified for demo, usually a burger menu here */
            .hhx9et-download-grid { grid-template-columns: 1fr; margin-top: -40px; }
            .hhx9et-flex { flex-direction: column; }
            .hhx9et-tech-box { padding: 24px; }
            .hhx9et-scenario-container { grid-template-columns: 1fr; }
        }