:root {
    --bg: #ffffff;
    --fg: #111111;
    --muted: #555555;
    --rule: #dddddd;
    --link: #0033aa;
    --link-visited: #551a8b;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f0f0f;
        --fg: #e6e6e6;
        --muted: #aaaaaa;
        --rule: #333333;
        --link: #8cb4ff;
        --link-visited: #c58cff;
    }
}

body {
    margin: 0;
    padding: 2rem 1rem;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
}

main {
    max-width: 72ch;
    margin: 0 auto;
}

h1,
h2,
h3 {
    line-height: 1.3;
}

h1 {
    margin-top: 0;
}

hr {
    border: none;
    border-top: 1px solid var(--rule);
    margin: 2rem 0;
}

p {
    margin: 1rem 0;
}

ul {
    margin: 1rem 0 1rem 1.5rem;
}

li {
    margin: 0.3rem 0;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:visited {
    color: var(--link-visited);
}

a:hover {
    text-decoration: underline;
}

code,
pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95em;
}

pre {
    padding: 1rem;
    overflow-x: auto;
    border: 1px solid var(--rule);
    background: transparent;
}

blockquote {
    margin: 1.5rem 0;
    padding-left: 1rem;
    border-left: 3px solid var(--rule);
    color: var(--muted);
}

footer {
    margin-top: 3rem;
    font-size: 0.9em;
    color: var(--muted);
}