:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-danger: #EA4335;
            --tr7nn-warning: #FBBC04;
            --tr7nn-success: #34A853;
            --tr7nn-text: #202124;
            --tr7nn-text-light: #5f6368;
            --tr7nn-bg: #ffffff;
            --tr7nn-bg-alt: #f8f9fa;
            --tr7nn-border: #dadce0;
            --tr7nn-radius: 16px;
            --tr7nn-container-width: 1320px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            color: var(--tr7nn-text);
            background-color: var(--tr7nn-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* Layout Helpers */
        .tr7nn-container {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .tr7nn-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .tr7nn-flex-item {
            min-width: 0;
        }

        .tr7nn-grid {
            display: grid;
            gap: 24px;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            margin-bottom: 16px;
            white-space: normal;
        }

        h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); font-weight: 800; letter-spacing: -0.02em; }
        h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.8rem); font-weight: 700; }
        p { font-size: clamp(1rem, 1vw + 0.5rem, 1.125rem); color: var(--tr7nn-text-light); word-break: break-word; }

        /* Navigation */
        .tr7nn-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--tr7nn-border);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .tr7nn-nav-content {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: nowrap;
        }

        .tr7nn-logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
        }

        .tr7nn-logo img {
            height: 32px;
            width: auto;
        }

        .tr7nn-menu {
            display: flex;
            gap: 8px;
            list-style: none;
            margin-left: 24px;
            overflow-x: auto;
            scrollbar-width: none;
        }

        .tr7nn-menu::-webkit-scrollbar { display: none; }

        .tr7nn-menu li a {
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--tr7nn-text-light);
            white-space: nowrap;
        }

        .tr7nn-menu li a:hover {
            background: rgba(0,0,0,0.05);
            color: var(--tr7nn-primary);
        }

        .tr7nn-menu li a.active {
            background: rgba(66, 133, 244, 0.1);
            color: var(--tr7nn-primary);
        }

        /* Hero Section */
        .tr7nn-hero {
            padding: 160px 0 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%);
            text-align: center;
        }

        .tr7nn-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--tr7nn-bg-alt);
            border: 1px solid var(--tr7nn-border);
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            color: var(--tr7nn-primary);
        }

        .tr7nn-hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        /* Tab Group Visualization Component */
        .tr7nn-tab-viz {
            margin-top: 64px;
            background: #fff;
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.08);
            padding: 40px;
            border: 1px solid var(--tr7nn-border);
            position: relative;
        }

        .tr7nn-browser-mock {
            background: #f1f3f4;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #ddd;
        }

        .tr7nn-tab-strip {
            display: flex;
            padding: 8px 8px 0;
            gap: 4px;
            background: #dee1e6;
        }

        .tr7nn-tab-group-pill {
            display: flex;
            align-items: center;
            height: 32px;
            padding: 0 12px;
            border-radius: 8px 8px 0 0;
            font-size: 12px;
            font-weight: bold;
            color: white;
            background: var(--tr7nn-primary);
        }

        .tr7nn-tab-item {
            height: 32px;
            width: 140px;
            background: #fff;
            border-radius: 8px 8px 0 0;
            display: flex;
            align-items: center;
            padding: 0 12px;
            font-size: 11px;
            border-right: 1px solid #ddd;
        }

        /* Features Section */
        .tr7nn-section {
            padding: 96px 0;
        }

        .tr7nn-feature-grid {
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        }

        .tr7nn-feature-card {
            padding: 40px;
            border-radius: var(--tr7nn-radius);
            background: var(--tr7nn-bg);
            border: 1px solid var(--tr7nn-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .tr7nn-feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.05);
        }

        .tr7nn-icon-box {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: white;
        }

        /* Security Matrix */
        .tr7nn-matrix-section {
            background-color: var(--tr7nn-bg-alt);
            border-radius: 48px;
            margin: 0 24px;
        }

        .tr7nn-matrix-grid {
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 16px;
        }

        .tr7nn-matrix-item {
            background: #fff;
            padding: 24px;
            border-radius: 16px;
            border-left: 4px solid var(--tr7nn-primary);
        }

        .tr7nn-matrix-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .tr7nn-status-badge {
            font-size: 11px;
            padding: 2px 8px;
            background: rgba(52, 168, 83, 0.1);
            color: var(--tr7nn-success);
            border-radius: 4px;
            font-weight: 700;
        }

        /* Buttons */
        .tr7nn-btn {
            display: inline-flex;
            align-items: center;
            padding: 14px 32px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .tr7nn-btn-primary {
            background: var(--tr7nn-primary);
            color: white;
            border: none;
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.3);
        }

        .tr7nn-btn-primary:hover {
            background: #3367d6;
            transform: scale(1.02);
        }

        /* Footer */
        .tr7nn-footer {
            padding: 80px 0 40px;
            border-top: 1px solid var(--tr7nn-border);
            margin-top: 64px;
        }

        .tr7nn-footer-top {
            display: flex;
            justify-content: space-between;
            margin-bottom: 64px;
        }

        .tr7nn-footer-brand h4 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .tr7nn-footer-links {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        .tr7nn-footer-col h5 {
            margin-bottom: 20px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }

        .tr7nn-footer-col ul {
            list-style: none;
        }

        .tr7nn-footer-col ul li {
            margin-bottom: 12px;
        }

        .tr7nn-footer-col ul li a {
            font-size: 14px;
            color: var(--tr7nn-text-light);
        }

        .tr7nn-footer-col ul li a:hover {
            color: var(--tr7nn-primary);
        }

        .tr7nn-copyright {
            padding-top: 32px;
            border-top: 1px solid var(--tr7nn-border);
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: #80868b;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .tr7nn-menu { display: none; }
            .tr7nn-footer-top { flex-direction: column; gap: 40px; }
            .tr7nn-matrix-grid { grid-template-columns: 1fr; }
            .tr7nn-hero { padding-top: 120px; }
        }

        /* JSON-LD Placeholder */