:root {
    color-scheme: light dark;
    --ink: #1a1a1a;
    --muted: #5c5c5c;
    --bg: #fdfdfc;
    --rule: #e4e2dd;
    --link: #2f5d8a;
}
@media (prefers-color-scheme: dark) {
    :root {
        --ink: #e8e6e3;
        --muted: #a09b94;
        --bg: #16151a;
        --rule: #2e2c33;
        --link: #8fb6dd;
    }
}
* { box-sizing: border-box; }
body {
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
    max-width: 40rem;
    background: var(--bg);
    color: var(--ink);
    font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
h1 { font-size: 1.7rem; line-height: 1.2; margin: 0 0 .3rem; }
h2 { font-size: 1.05rem; margin: 2.4rem 0 .6rem; }
.sub { color: var(--muted); margin: 0 0 2.5rem; }
a { color: var(--link); }
hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0 1.5rem; }
footer { color: var(--muted); font-size: .9rem; }
ul { padding-left: 1.2rem; }
li { margin-bottom: .5rem; }