:root {
            --xa698d-primary: #1e62ec;
            --xa698d-primary-hover: #1546b8;
            --xa698d-accent: #ff4d4f;
            --xa698d-text-main: #262626;
            --xa698d-text-sub: #595959;
            --xa698d-bg-light: #f8fafc;
            --xa698d-white: #ffffff;
            --xa698d-border: #e2e8f0;
            --xa698d-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            --xa698d-radius: 16px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--xa698d-bg-light);
            color: var(--xa698d-text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Layout Container */
        .xa698d-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Navigation */
        .xa698d-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--xa698d-border);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .xa698d-nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            flex-wrap: nowrap;
        }

        .xa698d-logo {
            flex-shrink: 0;
        }

        .xa698d-logo img {
            height: 36px;
            display: block;
        }

        .xa698d-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            margin-left: 32px;
        }

        .xa698d-menu a {
            text-decoration: none;
            color: var(--xa698d-text-sub);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
            white-space: nowrap;
        }

        .xa698d-menu a:hover, .xa698d-menu a.xa698d-active {
            color: var(--xa698d-primary);
        }

        /* Hero Download Section */
        .xa698d-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            text-align: center;
            background: radial-gradient(circle at top right, #e6f7ff 0%, transparent 40%);
        }

        .xa698d-hero-tag {
            display: inline-block;
            background: rgba(30, 98, 236, 0.1);
            color: var(--xa698d-primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 14px;
            margin-bottom: 24px;
            font-weight: 600;
        }

        .xa698d-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            color: #1a1a1a;
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .xa698d-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--xa698d-text-sub);
            max-width: 700px;
            margin: 0 auto 48px;
            word-break: break-word;
        }

        .xa698d-hero-visual {
            position: relative;
            margin-top: 40px;
            border-radius: var(--xa698d-radius);
            overflow: hidden;
            box-shadow: var(--xa698d-shadow);
        }

        .xa698d-hero-visual img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

        /* Version Matrix */
        .xa698d-version-section {
            padding: 80px 0;
        }

        .xa698d-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
        }

        .xa698d-version-card {
            flex: 1;
            min-width: 320px;
            background: var(--xa698d-white);
            border-radius: var(--xa698d-radius);
            padding: 40px;
            border: 1px solid var(--xa698d-border);
            transition: transform 0.3s, box-shadow 0.3s;
            display: flex;
            flex-direction: column;
            word-break: break-word;
        }

        .xa698d-version-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
            border-color: var(--xa698d-primary);
        }

        .xa698d-card-header h3 {
            font-size: 24px;
            margin-bottom: 12px;
            color: #1a1a1a;
        }

        .xa698d-card-badge {
            font-size: 12px;
            background: #f0f5ff;
            color: var(--xa698d-primary);
            padding: 2px 8px;
            border-radius: 4px;
            margin-bottom: 20px;
            display: inline-block;
        }

        .xa698d-specs {
            list-style: none;
            margin: 24px 0;
            flex-grow: 1;
        }

        .xa698d-specs li {
            padding: 8px 0;
            font-size: 14px;
            color: var(--xa698d-text-sub);
            border-bottom: 1px dashed var(--xa698d-border);
        }

        .xa698d-specs li span {
            color: var(--xa698d-text-main);
            font-weight: 600;
        }

        .xa698d-dl-btn {
            display: block;
            text-align: center;
            background: var(--xa698d-primary);
            color: white;
            padding: 14px 24px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 600;
            transition: background 0.3s;
            margin-top: 24px;
        }

        .xa698d-dl-btn:hover {
            background: var(--xa698d-primary-hover);
        }

        /* Tech Layers Section */
        .xa698d-tech-section {
            background: #1a1a1a;
            color: white;
            padding: 96px 0;
            border-radius: 40px;
            margin-bottom: 80px;
        }

        .xa698d-tech-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .xa698d-tech-title h2 {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 16px;
        }

        .xa698d-tech-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .xa698d-tech-item {
            flex: 1;
            min-width: 280px;
        }

        .xa698d-tech-num {
            font-size: 48px;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.1);
            margin-bottom: -20px;
            display: block;
        }

        .xa698d-tech-item h4 {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--xa698d-primary);
        }

        .xa698d-tech-item p {
            color: #a0aec0;
            font-size: 15px;
            line-height: 1.8;
        }

        /* Security & Platform Section */
        .xa698d-feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            padding: 80px 0;
        }

        .xa698d-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .xa698d-feature-content {
            flex: 1;
            min-width: 300px;
        }

        .xa698d-feature-image {
            flex: 1;
            min-width: 300px;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--xa698d-shadow);
        }

        .xa698d-feature-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .xa698d-feature-content h2 {
            font-size: 32px;
            margin-bottom: 24px;
            color: #1a1a1a;
        }

        .xa698d-feature-content p {
            font-size: 16px;
            color: var(--xa698d-text-sub);
            margin-bottom: 32px;
        }

        /* Knowledge Base Section */
        .xa698d-kb-section {
            padding: 80px 0;
            background: var(--xa698d-white);
            border-radius: 40px;
        }

        .xa698d-kb-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            margin-top: 48px;
        }

        .xa698d-kb-item {
            padding: 24px;
            background: var(--xa698d-bg-light);
            border-radius: 12px;
            text-decoration: none;
            color: inherit;
            transition: background 0.3s;
        }

        .xa698d-kb-item:hover {
            background: #edf2f7;
        }

        .xa698d-kb-tag {
            font-size: 12px;
            background: #e2e8f0;
            padding: 2px 8px;
            border-radius: 4px;
            margin-bottom: 12px;
            display: inline-block;
        }

        .xa698d-kb-item h5 {
            font-size: 18px;
            margin-bottom: 8px;
        }

        /* Feedback Section */
        .xa698d-feedback {
            padding: 80px 0;
        }

        .xa698d-feedback-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .xa698d-feedback-card {
            flex: 1;
            min-width: 300px;
            background: var(--xa698d-white);
            padding: 32px;
            border-radius: var(--xa698d-radius);
            box-shadow: var(--xa698d-shadow);
        }

        .xa698d-user-info {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }

        .xa698d-user-role {
            font-weight: 700;
            color: var(--xa698d-primary);
        }

        .xa698d-rating {
            margin-left: auto;
            color: #fadb14;
        }

        /* Footer */
        .xa698d-footer {
            background: #f8fafc;
            padding: 80px 0 40px;
            border-top: 1px solid var(--xa698d-border);
        }

        .xa698d-footer-brand {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--xa698d-primary);
        }

        .xa698d-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 48px;
        }

        .xa698d-footer-col h6 {
            font-size: 16px;
            margin-bottom: 20px;
            color: #1a1a1a;
        }

        .xa698d-footer-col ul {
            list-style: none;
        }

        .xa698d-footer-col li {
            margin-bottom: 12px;
        }

        .xa698d-footer-col a {
            text-decoration: none;
            color: var(--xa698d-text-sub);
            font-size: 14px;
            transition: color 0.3s;
        }

        .xa698d-footer-col a:hover {
            color: var(--xa698d-primary);
        }

        .xa698d-copyright {
            text-align: center;
            font-size: 14px;
            color: #a0aec0;
            padding-top: 40px;
            border-top: 1px solid var(--xa698d-border);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .xa698d-menu {
                display: none; /* In real site, this would be a hamburger menu */
            }
            .xa698d-feature-row {
                flex-direction: column !important;
                gap: 32px;
            }
            .xa698d-tech-item {
                min-width: 100%;
            }
        }