:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --accent: #1a8cfa;
  --rule: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f2f2f7;
    --muted: #98989f;
    --accent: #4da3ff;
    --rule: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 3rem 1.5rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main { max-width: 42rem; margin: 0 auto; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 .5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 2.5rem 0 .75rem; letter-spacing: -0.01em; }

.updated { color: var(--muted); font-size: .9rem; margin: 0 0 2.5rem; }

p, li { color: var(--fg); }
ul { padding-left: 1.25rem; }
li { margin-bottom: .4rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

hr { border: none; border-top: 1px solid var(--rule); margin: 3rem 0 1.5rem; }

footer { color: var(--muted); font-size: .9rem; }

.back { display: inline-block; margin-bottom: 2rem; color: var(--muted); font-size: .9rem; }