:root {
  --text: #1c1c1e;
  --secondary: #6c6c70;
  --background: #ffffff;
  --accent: #0b7285;
  --rule: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f7;
    --secondary: #a1a1a6;
    --background: #000000;
    --accent: #4cc3d9;
    --rule: #2c2c2e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 4px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
p, li { margin: 0 0 12px; }
ul { padding-left: 22px; }
.meta { color: var(--secondary); margin-bottom: 32px; }
a { color: var(--accent); }
nav { border-bottom: 1px solid var(--rule); }
nav div { max-width: 680px; margin: 0 auto; padding: 14px 16px; display: flex; gap: 20px; }
nav a { text-decoration: none; font-weight: 600; }
code { font: 15px ui-monospace, SFMono-Regular, Menlo, monospace; }