body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2, h3, h4, h5, h6 {
    color: #2c3e50;
    margin-top: 30px;
    margin-bottom: 15px;
}

h1 {
    border-bottom: 3px solid #3498db;
    padding-bottom: 10px;
}

h2 {
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 5px;
}

code {
    background-color: #f8f9fa;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

pre {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 5px;
    padding: 15px;
    overflow-x: auto;
}

pre code {
    background: none;
    padding: 0;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 20px 0;
}

th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
    font-weight: bold;
}

blockquote {
    border-left: 4px solid #3498db;
    margin: 20px 0;
    padding-left: 20px;
    font-style: italic;
}

.toc {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 5px;
    padding: 20px;
    margin: 20px 0;
}

@media print {
    body { margin: 0; }
    .page-break { page-break-before: always; }
}