:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-error: #EA4335;
            --tr7nn-warning: #FBBC04;
            --tr7nn-success: #34A853;
            --tr7nn-text-main: #202124;
            --tr7nn-text-light: #5f6368;
            --tr7nn-bg-gray: #f8f9fa;
            --tr7nn-white: #ffffff;
            --tr7nn-radius: 16px;
            --tr7nn-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --tr7nn-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--tr7nn-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            background-color: var(--tr7nn-white);
        }

        /* Layout Container */
        .tr7nn-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }

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

        p {
            word-break: break-word;
            overflow-wrap: break-word;
            line-height: 1.8;
        }

        /* Navigation */
        .tr7nn-header {
            position: sticky;
            top: 0;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 16px 0;
        }

        .tr7nn-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .tr7nn-logo {
            flex: 0 0 auto;
            min-width: 0;
            display: flex;
            align-items: center;
        }

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

        .tr7nn-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .tr7nn-menu li {
            min-width: 0;
        }

        .tr7nn-menu a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 20px;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-menu a:hover {
            background-color: var(--tr7nn-bg-gray);
            color: var(--tr7nn-primary);
        }

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

        /* Hero Section */
        .tr7nn-hero {
            padding: 96px 0;
            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%);
        }

        .tr7nn-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .tr7nn-hero-content {
            flex: 1 1 500px;
            min-width: 0;
        }

        .tr7nn-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            margin-bottom: 24px;
            color: var(--tr7nn-text-main);
            font-weight: 700;
            letter-spacing: -1px;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--tr7nn-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .tr7nn-hero-visual {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
        }

        .tr7nn-visual-box {
            background: var(--tr7nn-white);
            border-radius: 24px;
            padding: 32px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.1);
            border: 1px solid rgba(0,0,0,0.05);
            transform: perspective(1000px) rotateY(-5deg);
        }

        /* Bookmark Management Grid */
        .tr7nn-manager-section {
            padding: 80px 0;
            background-color: var(--tr7nn-bg-gray);
        }

        .tr7nn-section-header {
            margin-bottom: 48px;
            text-align: center;
        }

        .tr7nn-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }

        .tr7nn-bookmark-card {
            background: var(--tr7nn-white);
            border-radius: var(--tr7nn-radius);
            padding: 24px;
            transition: var(--tr7nn-transition);
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
            gap: 16px;
            min-width: 0;
        }

        .tr7nn-bookmark-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--tr7nn-shadow);
            border-color: rgba(66, 133, 244, 0.2);
        }

        .tr7nn-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--tr7nn-bg-gray);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--tr7nn-primary);
        }

        /* Security Matrix */
        .tr7nn-security-section {
            padding: 96px 0;
        }

        .tr7nn-matrix-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin-top: 48px;
        }

        .tr7nn-matrix-item {
            flex: 1 1 calc(50% - 32px);
            min-width: 300px;
            padding: 32px;
            border-radius: var(--tr7nn-radius);
            background: var(--tr7nn-white);
            border: 1px solid #eee;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-matrix-item:hover {
            background: #fff;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .tr7nn-protocol-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(52, 168, 83, 0.1);
            color: var(--tr7nn-success);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .tr7nn-matrix-title {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--tr7nn-text-main);
        }

        /* Footer */
        .tr7nn-footer {
            padding: 64px 0;
            background: var(--tr7nn-text-main);
            color: var(--tr7nn-white);
        }

        .tr7nn-footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .tr7nn-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .tr7nn-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .tr7nn-footer-links {
            flex: 1 1 200px;
            min-width: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .tr7nn-footer-links a {
            color: #9aa0a6;
            text-decoration: none;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-footer-links a:hover {
            color: var(--tr7nn-white);
        }

        /* Responsive Breakpoints */
        @media (max-width: 768px) {
            .tr7nn-container {
                padding: 0 20px;
            }
            .tr7nn-menu {
                display: none; /* In a real site, implement a hamburger menu */
            }
            .tr7nn-hero {
                padding: 48px 0;
                text-align: center;
            }
            .tr7nn-hero-grid {
                flex-direction: column;
            }
            .tr7nn-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .tr7nn-hero-visual {
                transform: none;
                order: -1;
            }
            .tr7nn-matrix-item {
                flex: 1 1 100%;
            }
        }

        /* Interactive Elements */
        .tr7nn-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--tr7nn-transition);
            cursor: pointer;
            border: none;
        }

        .tr7nn-btn-primary {
            background-color: var(--tr7nn-primary);
            color: var(--tr7nn-white);
        }

        .tr7nn-btn-primary:hover {
            box-shadow: 0 4px 15px rgba(66, 133, 244, 0.4);
            transform: translateY(-2px);
        }

        /* Dynamic Section Tag */
        .tr7nn-dynamic-marker {
            display: none;
        }