 #6c757d;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --border-color: #e1e4e8;
            --success-color: #28a745;
            --code-bg: #f6f8fa;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: #333;
    