* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Georgia', serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
            color: white;
            padding: 40px 20px;
            text-align: center;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        
        h1 {
            font-size: 3em;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        
        .subtitle {
            font-size: 1.2em;
            font-style: italic;
            opacity: 0.9;
        }
        
        .section {
            background: white;
            margin: 20px 0;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        h2 {
            color: #2c3e50;
            font-size: 2em;
            margin-bottom: 20px;
            border-bottom: 3px solid #3498db;
            padding-bottom: 10px;
        }
        
        h3 {
            color: #34495e;
            font-size: 1.5em;
            margin-top: 25px;
            margin-bottom: 15px;
        }
        
        h4 {
            color: #555;
            font-size: 1.2em;
            margin-top: 20px;
            margin-bottom: 10px;
        }
        
        p {
            margin-bottom: 15px;
            text-align: justify;
        }
        
        ul, ol {
            margin-left: 30px;
            margin-bottom: 15px;
        }
        
        li {
            margin-bottom: 8px;
        }
        
        .piece-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }
        
        .piece-card {
            border: 2px solid #3498db;
            border-radius: 8px;
            padding: 15px;
            background: #f8f9fa;
        }
        
        .piece-card h4 {
            color: #2c3e50;
            margin-top: 0;
        }
        
        .chess-board {
            display: inline-block;
            border: 3px solid #2c3e50;
            margin: 20px auto;
        }
        
        .notation-example {
            background: #f8f9fa;
            border-left: 4px solid #3498db;
            padding: 15px;
            margin: 15px 0;
            font-family: 'Courier New', monospace;
        }
        
        .highlight {
            background: #fff3cd;
            padding: 2px 5px;
            border-radius: 3px;
        }
        
        .quote {
            font-style: italic;
            border-left: 4px solid #95a5a6;
            padding-left: 20px;
            margin: 20px 0;
            color: #555;
        }
        
        .strategy-box {
            background: #e8f4f8;
            border: 2px solid #3498db;
            border-radius: 8px;
            padding: 20px;
            margin: 20px 0;
        }
        
        .warning {
            background: #fee;
            border-left: 4px solid #e74c3c;
            padding: 15px;
            margin: 15px 0;
        }
        
        .success {
            background: #efd;
            border-left: 4px solid #2ecc71;
            padding: 15px;
            margin: 15px 0;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        
        th, td {
            border: 1px solid #ddd;
            padding: 12px;
            text-align: left;
        }
        
        th {
            background: #34495e;
            color: white;
        }
        
        tr:nth-child(even) {
            background: #f2f2f2;
        }
        
        .footer {
            text-align: center;
            padding: 20px;
            color: #777;
            margin-top: 40px;
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 2em;
            }
            
            .piece-grid {
                grid-template-columns: 1fr;
            }
        }