:root {
  --ink: #0b0b0b;
  --paper: #ffffff;
  --muted: #5f5f5f;
  --surface: #f2f2f2;
  --line: #e2e2e2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f5f5f5;
    --paper: #0b0b0b;
    --muted: #a3a3a3;
    --surface: #1a1a1a;
    --line: #2a2a2a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
header { margin-bottom: 32px; }
.wordmark { font: 700 40px/1.1 ui-rounded, -apple-system, "SF Pro Rounded", sans-serif; margin: 0; }
.tagline { color: var(--muted); margin: 8px 0 0; }
nav { margin-top: 20px; display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--ink); font-weight: 600; text-decoration: none; border-bottom: 1.5px solid var(--ink); }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
p, li { color: var(--ink); }
.meta { color: var(--muted); font-size: 15px; margin: 0 0 24px; }
.card { background: var(--surface); border-radius: 18px; padding: 18px 20px; margin: 20px 0; }
.card p { margin: 0; }
a { color: inherit; }
ul { padding-left: 22px; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }