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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

h1 {
    color: #667eea;
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid #667eea;
}

h2 {
    color: #764ba2;
    margin-top: 30px;
    margin-bottom: 15px;
    padding-left: 10px;
    border-left: 4px solid #764ba2;
}

.example {
    background: #f8f9fa;
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
    border-left: 4px solid #667eea;
}

.code {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
}

.output {
    background: #e8f5e9;
    padding: 15px;
    margin: 10px 0;
    border-radius: 5px;
    border-left: 4px solid #4caf50;
}

.output strong {
    color: #2e7d32;
}