body {
    max-width: 40em;
    margin: 2rem auto;
    padding: 0 1rem;
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    color: #222;
    background: #fff;
}

a {
    color: #0a7;
}

footer {
    margin-top: 3rem;
    font-size: 0.9rem;
    color: #666;
}

@media (prefers-color-scheme: dark) {
    body {
        color: #ddd;
        background: #111;
    }

    a {
        color: #3cb;
    }

    footer {
        color: #999;
    }
}