:root {
  --paper: #F4F5F9;
  --ink: #1B2140;
  --accent: #4F6BFF;
  --muted: rgba(27, 33, 64, 0.7);
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10142A;
    --ink: #F4F5F9;
    --muted: rgba(244, 245, 249, 0.7);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 24px 16px 64px;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 40rem; margin: 0 auto; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 1.2rem 0 0.4rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 0.4rem; }
p, ul { margin: 0.6rem 0; }
ul { padding-left: 1.3rem; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 0.9rem; }
nav { font-size: 0.95rem; }