body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.5;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    color: #333;
}
header nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 1rem;
}
.intro {
    font-size: 1.25rem;
    color: #666;
}
footer {
    margin-top: 4rem;
    border-top: 1px solid #eee;
    padding-top: 2rem;
    font-size: 0.875rem;
    color: #888;
}