* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            min-height: 100vh;
            padding: 40px 20px;
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 2em;
        }
        .editor-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }
        .editor-section {
            display: flex;
            flex-direction: column;
        }
        label {
            margin-bottom: 8px;
            color: #555;
            font-weight: 600;
            font-size: 14px;
        }
        textarea {
            width: 100%;
            height: 500px;
            padding: 15px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 14px;
            font-family: 'Courier New', monospace;
            resize: vertical;
            transition: border-color 0.3s;
        }
        textarea:focus {
            outline: none;
            border-color: #4facfe;
        }
        .preview {
            width: 100%;
            height: 500px;
            padding: 20px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            overflow-y: auto;
            background: #f9f9f9;
        }
        .preview h1, .preview h2, .preview h3 {
            margin: 20px 0 10px;
        }
        .preview p {
            margin: 10px 0;
            line-height: 1.6;
        }
        .preview code {
            background: #f0f0f0;
            padding: 2px 6px;
            border-radius: 3px;
            font-family: 'Courier New', monospace;
        }
        .preview pre {
            background: #2d2d2d;
            color: #f8f8f2;
            padding: 15px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 10px 0;
        }
        .preview pre code {
            background: none;
            color: inherit;
            padding: 0;
        }
        .preview blockquote {
            border-left: 4px solid #4facfe;
            padding-left: 15px;
            margin: 10px 0;
            color: #666;
        }
        .preview ul, .preview ol {
            margin: 10px 0 10px 25px;
        }
        .preview a {
            color: #4facfe;
            text-decoration: none;
        }
        .preview a:hover {
            text-decoration: underline;
        }
        .preview table {
            border-collapse: collapse;
            width: 100%;
            margin: 10px 0;
        }
        .preview th, .preview td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }
        .preview th {
            background: #4facfe;
            color: white;
        }
        .button-group {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }
        button {
            padding: 12px 24px;
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s;
        }
        button:hover {
            transform: translateY(-2px);
        }
        button.secondary {
            background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
        }
        @media (max-width: 768px) {
            .editor-container {
                grid-template-columns: 1fr;
            }
        }