body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    max-width: 900px;
    margin: auto;
    padding: 2rem;
    line-height: 1.6;
}

header {
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
}

footer {
    margin-top: 4rem;
    opacity: 0.7;
}