:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #5f6368;
  --card: #f3f5f9;
  --accent: #1a5fd6;
  --accent-fg: #ffffff;
  --warn-bg: #fff3e0;
  --warn-fg: #8a3b00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #ececec;
    --muted: #a8adb4;
    --card: #23262b;
    --accent: #6b9cff;
    --accent-fg: #0b0d10;
    --warn-bg: #3a2a12;
    --warn-fg: #ffcf8a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1.0625rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 34rem; margin: 0 auto; padding: 3rem 1rem; }
h1 { font-size: 1.6rem; line-height: 1.2; margin: 0 0 1rem; }
.lead { font-size: 1.15rem; }
.muted { color: var(--muted); }
a { color: var(--accent); }
.button {
  display: inline-block;
  padding: .7rem 1.3rem;
  border: 0;
  border-radius: .5rem;
  background: var(--accent);
  color: var(--accent-fg);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.button.big { padding: 1rem 1.8rem; font-size: 1.2rem; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.card { background: var(--card); border-radius: .6rem; padding: .25rem 1rem; margin: 1.5rem 0; }
.card.lost, .card.stale { background: var(--warn-bg); color: var(--warn-fg); }
.card.lost a:not(.button) { color: inherit; }
.code { font: 700 2.5rem/1.2 ui-monospace, monospace; letter-spacing: .3rem; }
.links { display: flex; gap: 1.5rem; align-items: center; flex-wrap: wrap; }
.links form { margin: 0; }
button.link {
  border: 0; padding: 0; background: none;
  color: var(--accent); font: inherit; text-decoration: underline; cursor: pointer;
}
[hidden] { display: none !important; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
fieldset { border: 0; padding: 0; margin: 0 0 1.5rem; }
legend { font-weight: 600; margin-bottom: .5rem; padding: 0; }
.choice { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; padding: .35rem 0; }
.choice input { width: 1.2rem; height: 1.2rem; margin: 0; }
.hint { margin: 0 0 .25rem 1.7rem; font-size: .95rem; }
select { font: inherit; padding: .2rem .4rem; }
.swatch { display: inline-block; width: .9rem; height: .9rem; border-radius: 50%; }
.button.danger { background: #c62828; color: #fff; }