:root {
    color-scheme: light dark;
    --max-width: 760px;
    --pad: 1.25rem;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    line-height: 1.55;
    background: Canvas;
    color: CanvasText;
}
main {
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 var(--pad);
}
nav, footer {
    max-width: var(--max-width);
    margin: 1rem auto;
    padding: 0 var(--pad);
    font-size: 0.9rem;
}
nav { display: flex; gap: 0.75rem; align-items: baseline; }
nav a:first-child { font-weight: 600; }
nav a, footer a { text-decoration: none; }
nav a:hover, footer a:hover { text-decoration: underline; }
footer { margin-top: 3rem; opacity: 0.85; }
h1 { line-height: 1.15; }
ul { padding-left: 1.2rem; }
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid currentColor; padding: 0.4rem 0.6rem; }
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
hr { border: none; border-top: 1px solid currentColor; opacity: 0.2; margin: 2rem 0; }