:root {
            --color-bg: #ffffff;
            --color-text: #24292f;
            --color-border: #d0d7de;
            --color-accent: #0969da;
            --color-success: #1a7f37;
            --color-error: #cf222e;
            --color-warning: #d1242f;
            --color-muted: #656d76;
            --spacing-unit: 8px;
            --border-radius: 6px;
            --shadow: 0 1px 3px rgba(31, 35, 40, 0.12), 0 1px 2px rgba(31, 35, 40, 0.24);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: calc(var(--spacing-unit) * 2);
        }

        header {
            background-color: var(--color-bg);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 3px rgba(31, 35, 40, 0.12);
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: calc(var(--spacing-unit) * 2);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 24px;
            font-weight: 600;
            color: var(--color-accent);
            text-decoration: none;
        }

        .nav {
            display: flex;
            gap: calc(var(--spacing-unit) * 3);
        }

        .nav-item {
            padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
            text-decoration: none;
            color: var(--color-text);
            border-radius: var(--border-radius);
            transition: all 0.2s ease;
        }

        .nav-item:hover, .nav-item.active {
            background-color: var(--color-accent);
            color: white;
        }

        .hero {
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
            border-bottom: 1px solid var(--color-border);
        }

        .hero h1 {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--color-text);
        }

        .hero p {
            font-size: 20px;
            color: var(--color-muted);
            max-width: 600px;
            margin: 0 auto calc(var(--spacing-unit) * 4);
        }

        .section {
            padding: calc(var(--spacing-unit) * 6) 0;
            border-bottom: 1px solid var(--color-border);
        }

        .section h2 {
            font-size: 32px;
            font-weight: 600;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--color-text);
        }

        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: calc(var(--spacing-unit) * 4);
            margin-bottom: calc(var(--spacing-unit) * 6);
        }

        .comparison-card {
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .comparison-header {
            padding: calc(var(--spacing-unit) * 2);
            font-weight: 600;
            text-align: center;
        }

        .traditional {
            background-color: #fff8f8;
            border-bottom: 1px solid var(--color-error);
        }

        .modern {
            background-color: #f0f9ff;
            border-bottom: 1px solid var(--color-accent);
        }

        .code-block {
            background-color: #f6f8fa;
            padding: calc(var(--spacing-unit) * 2);
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            font-size: 14px;
            overflow-x: auto;
            line-height: 1.5;
        }

        .editor {
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius);
            overflow: hidden;
            margin: calc(var(--spacing-unit) * 3) 0;
        }

        .editor-header {
            background-color: #f6f8fa;
            padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
            border-bottom: 1px solid var(--color-border);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .editor-content {
            position: relative;
        }

        .editor-content textarea {
            width: 100%;
            height: 300px;
            border: none;
            outline: none;
            background-color: #f6f8fa;
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            font-size: 14px;
            padding: calc(var(--spacing-unit) * 2);
            line-height: 1.5;
            resize: vertical;
        }

        .btn {
            background-color: var(--color-accent);
            color: white;
            border: none;
            padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .btn:hover {
            background-color: #0550ae;
        }

        .btn:disabled {
            background-color: var(--color-muted);
            cursor: not-allowed;
        }

        .status-badge {
            display: inline-block;
            padding: 4px 8px;
            border-radius: 12px;
            font-size: 12px;
            font-weight: 500;
            margin: 2px;
        }

        .status-fresh { background-color: #dafbe1; color: var(--color-success); }
        .status-stale { background-color: #fff8c5; color: #d69000; }
        .status-fetching { background-color: #ddf4ff; color: var(--color-accent); animation: pulse 1.5s infinite; }
        .status-error { background-color: #ffebe9; color: var(--color-error); }

        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.5; }
            100% { opacity: 1; }
        }

        .demo-section {
            background-color: #f6f8fa;
            padding: calc(var(--spacing-unit) * 4);
            border-radius: var(--border-radius);
            margin: calc(var(--spacing-unit) * 3) 0;
        }

        .demo-controls {
            display: flex;
            gap: calc(var(--spacing-unit) * 2);
            margin-bottom: calc(var(--spacing-unit) * 3);
            flex-wrap: wrap;
        }

        .control-group {
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit));
        }

        .control-group label {
            font-weight: 500;
            white-space: nowrap;
        }

        .slider {
            width: 100px;
        }

        .network-activity {
            background-color: #000;
            color: #00ff00;
            padding: calc(var(--spacing-unit) * 2);
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            font-size: 12px;
            border-radius: var(--border-radius);
            margin: calc(var(--spacing-unit) * 2) 0;
            max-height: 200px;
            overflow-y: auto;
        }

        .tooltip {
            position: relative;
            cursor: help;
            border-bottom: 1px dotted var(--color-muted);
        }

        .tooltip:hover::after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--color-text);
            color: var(--color-bg);
            padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
            border-radius: var(--border-radius);
            font-size: 12px;
            white-space: nowrap;
            z-index: 1000;
            box-shadow: var(--shadow);
        }

        .data-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

        .data-item {
            background-color: white;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius);
            padding: calc(var(--spacing-unit) * 2);
        }

        .form-group {
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .form-group label {
            display: block;
            margin-bottom: calc(var(--spacing-unit));
            font-weight: 500;
        }

        .form-group input, .form-group textarea {
            width: 100%;
            padding: calc(var(--spacing-unit));
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius);
            font-size: 14px;
        }

        .results-area {
            background-color: #f6f8fa;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius);
            padding: calc(var(--spacing-unit) * 2);
            margin: calc(var(--spacing-unit) * 2) 0;
            min-height: 100px;
        }

        @media (max-width: 768px) {
            .comparison-grid {
                grid-template-columns: 1fr;
            }
            
            .header-content {
                flex-direction: column;
                gap: calc(var(--spacing-unit) * 2);
            }
            
            .nav {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .demo-controls {
                flex-direction: column;
                align-items: stretch;
            }
        }