:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --accent: #2e6bf0;
  --line: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --text: #f2f2f7; --muted: #98989d; --accent: #6194ff; --line: #2c2c2e; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.lead { font-size: 20px; color: var(--muted); }
.meta, .small, .back { color: var(--muted); font-size: 14px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }