:root {
  color-scheme: light dark;
  --bg: #fbfaf8;
  --fg: #1c1a17;
  --muted: #6b655d;
  --line: #e2ddd4;
  --card: #ffffff;
  --accent: #1f6f5c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141613;
    --fg: #ececea;
    --muted: #9a958c;
    --line: #2c302b;
    --card: #1b1e1a;
    --accent: #6fbfa5;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 44rem; margin: 0 auto; padding: 4rem 1.5rem 5rem; }
header { margin-bottom: 3.5rem; }
h1 { font-size: 1.5rem; letter-spacing: -0.01em; margin: 0 0 0.3rem; }
header p { color: var(--muted); margin: 0; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.75rem;
}
.card h2 { font-size: 1.25rem; margin: 0 0 0.15rem; }
.tagline { color: var(--muted); margin: 0 0 1.4rem; }
ul { margin: 0 0 1.75rem; padding-left: 1.1rem; }
li { margin-bottom: 0.5rem; }
li::marker { color: var(--accent); }
.links { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.links a {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  text-decoration: none;
  color: var(--fg);
  font-size: 0.9rem;
}
.links a.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .links a.primary { color: #10221c; } }
.links a:hover { border-color: var(--accent); }
footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}
footer a { color: var(--muted); }
article h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }
article h2 { font-size: 1.1rem; margin: 2rem 0 0.5rem; }
article h3 { font-size: 0.98rem; margin: 1.5rem 0 0.4rem; }
article .updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 2.5rem; }
article a { color: var(--accent); }
.back { display: inline-block; margin-bottom: 2rem; color: var(--muted); font-size: 0.9rem; }

/* QR blocks on apps.html. The codes are always black-on-white, including in dark mode: a
   scanner expects dark modules on a light ground, and inverting them makes some phones fail.
   So the tile stays white and gets a border in dark mode to keep it from glaring. */
.qrs { display: flex; flex-wrap: wrap; gap: 1.25rem; margin: 0 0 1.5rem; }
.qr { margin: 0; text-align: center; }
.qr img {
  display: block;
  width: 160px;
  height: 160px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem;
  image-rendering: pixelated;   /* keep module edges crisp when scaled */
}
.qr figcaption { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }
.note { color: var(--muted); font-size: 0.875rem; margin: 1rem 0 0; }
.note a { color: var(--accent); }