:root {
  --bg: #f7f7f8;
  --text: #111114;
  --muted: #5f6068;
  --line: #e4e4e8;
  --accent: #1f3a5f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b0c0f; --text: #f5f5f7; --muted: #a0a1aa; --line: #23262d; --accent: #7fa3e0; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 80px; }
header.site { max-width: 680px; margin: 0 auto; padding: 24px 20px 0; }
header.site a { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.3px; }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.5px; margin: 0 0 8px; }
h2 { font-size: 22px; line-height: 1.3; margin: 40px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
ul { padding-left: 22px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
footer { max-width: 680px; margin: 0 auto; padding: 0 20px 48px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }
.lead { font-size: 20px; color: var(--muted); }