:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --link: #0a66d6;
  --rule: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --text: #f2f2f5;
    --muted: #a1a1a8;
    --link: #5aa2ff;
    --rule: #2c2c30;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.3rem; margin: 36px 0 8px; padding-top: 20px; border-top: 1px solid var(--rule); }
h3 { font-size: 1.05rem; margin: 20px 0 4px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: var(--link); }
.meta, .back { color: var(--muted); font-size: 0.95rem; }
.back { margin-bottom: 24px; }
.back a { text-decoration: none; }
.lede { font-size: 1.15rem; color: var(--muted); }
.links { list-style: none; padding: 0; }
.links li { margin-bottom: 10px; font-size: 1.1rem; }