body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
    color: #333;
}
header {
    border-bottom: 1px solid #eee;
    margin-bottom: 2rem;
}
nav a {
    margin-right: 1rem;
    text-decoration: none;
    color: #0066cc;
}
nav a:hover {
    text-decoration: underline;
}
footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    color: #666;
    font-size: 0.9rem;
}