:root {
  --bg: #fafaf8;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --accent: #2f5d8a;
  --card: #ffffff;
  --border: #e3e3e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --fg: #f2f2f4;
    --muted: #9b9ba1;
    --accent: #8ab4e8;
    --card: #202024;
    --border: #333338;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 2.5rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 0.5rem; }
h2 { font-size: 1.2rem; margin-top: 2rem; }
a { color: var(--accent); }
.tagline { color: var(--muted); margin-top: 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem 1.3rem;
  margin: 1rem 0;
}
.card h2 { margin: 0 0 0.3rem; }
.card p { margin: 0.3rem 0; }
.muted { color: var(--muted); font-size: 0.92rem; }
footer {
  max-width: 42rem;
  margin: 3rem auto 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--muted); }
.todo { background: #ffe95c; color: #1c1c1e; padding: 0 0.25em; border-radius: 3px; }