:root {
  --bone: #f4eee4;
  --mute: rgba(244, 238, 228, 0.55);
  --copper: #d3894a;
  --ink: #07080b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--ink);
  color: var(--bone);
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
}

body {
  min-height: 100dvh;
}

#app {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  padding-top: max(1.5rem, env(safe-area-inset-top));
  padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
}

.panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.panel[hidden] { display: none; }

#check {
  appearance: none;
  border: 1px solid var(--copper);
  background: transparent;
  color: var(--bone);
  font: inherit;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  cursor: pointer;
}

#check:active { background: rgba(211, 137, 74, 0.12); }

.spinner {
  width: 2.25rem;
  height: 2.25rem;
  border: 2px solid rgba(244, 238, 228, 0.18);
  border-top-color: var(--copper);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

p {
  margin: 0;
  color: var(--mute);
  letter-spacing: 0.12em;
  text-transform: lowercase;
  font-size: 0.9rem;
}

.back {
  appearance: none;
  border: 0;
  background: none;
  color: var(--mute);
  font: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: lowercase;
  cursor: pointer;
  padding: 0.5rem;
}

.back:hover { color: var(--bone); }

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; border-top-color: var(--copper); }
}