:root {
  --brand: #f25c05;
  --bg: #ffffff;
  --ink: #0d0d0d;
  --ink-muted: #5c5c5c;
  --line: #e6e6e6;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d0d;
    --ink: #ffffff;
    --ink-muted: #8a8a8a;
    --line: #2a2a2a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 16px 80px;
}

header a {
  color: var(--brand);
  font-weight: 700;
  font-size: 22px;
  text-decoration: none;
}

h1 { font-size: 32px; line-height: 1.2; margin: 32px 0 8px; }
h2 { font-size: 21px; margin: 40px 0 8px; }
h3 { font-size: 17px; margin: 24px 0 4px; }

p, li { color: var(--ink); }
.updated { color: var(--ink-muted); margin: 0 0 24px; }
a { color: inherit; }
mark { background: #ffe08a; color: #0d0d0d; padding: 0 4px; }

footer {
  margin-top: 56px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 15px;
}

footer a { margin-right: 16px; }