/* Flashcard game layout. Mobile first; the card is the whole point, so it
   gets most of the viewport and the controls sit within thumb reach. */

.game {
  min-height: 100dvh;
  max-width: 520px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) calc(var(--space-5) + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.game-header { text-align: center; }

.eyebrow {
  margin: 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stone-text);
}

.game-header h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 44px;
  line-height: 1;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--brand);
}

/* ── Stage: the card plus its progress line ───────────────────────── */

.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-height: 0;
}

/* ── The card ─────────────────────────────────────────────────────── */

.card {
  flex: 1;
  min-height: 300px;
  max-height: 520px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  perspective: 1200px;
  -webkit-tap-highlight-color: transparent;
  animation: deal-in 280ms ease-out;
  border-radius: var(--radius);
  position: relative;
}

.card-inner {
  position: absolute;
  inset: 0;
  display: block;
  transform-style: preserve-3d;
  transition: transform 500ms cubic-bezier(0.3, 0.7, 0.2, 1);
}

.card.is-flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-5);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-front {
  background: var(--white);
  border: 1px solid var(--border);
}

.card-back {
  background: var(--brand);
  color: var(--white);
  transform: rotateY(180deg);
}

.card-tag {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.card-back .card-tag {
  background: oklch(99% 0.006 82 / 0.16);
  color: var(--white);
}

.card-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 11vw, 64px);
  line-height: 1.05;
  overflow-wrap: anywhere;
}

.card-hint {
  position: absolute;
  bottom: var(--space-4);
  font-size: 14px;
  color: var(--stone-text);
}

.card-note {
  max-width: 32ch;
  font-size: 16px;
  opacity: 0.9;
}

.card:active .card-inner { scale: 0.985; }

@keyframes deal-in {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}

/* ── Progress ─────────────────────────────────────────────────────── */

.progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 14px;
  color: var(--stone-text);
}

.progress-count {
  min-width: 5ch;
  font-variant-numeric: tabular-nums;
}

.progress progress {
  flex: 1;
  height: 6px;
  border: 0;
  border-radius: 999px;
  background: var(--panel);
  appearance: none;
  overflow: hidden;
}
.progress progress::-webkit-progress-bar { background: var(--panel); }
.progress progress::-webkit-progress-value { background: var(--brand); border-radius: 999px; }
.progress progress::-moz-progress-bar { background: var(--brand); border-radius: 999px; }

/* ── Controls ─────────────────────────────────────────────────────── */

.controls {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
}

.btn {
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  font-weight: 500;
  cursor: pointer;
  transition: background 120ms, border-color 120ms;
}
.btn:hover { border-color: var(--charcoal-soft); }
.btn:active { background: var(--panel); }

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--charcoal-soft);
}
.btn-ghost:hover { border-color: var(--border); }

.btn-primary {
  background: var(--brand);
  border-color: var(--brand);
  color: var(--white);
}
.btn-primary:hover { background: var(--brand-dark); border-color: var(--brand-dark); }
.btn-primary:active { background: var(--brand-dark); }

.keys-hint {
  margin: 0;
  text-align: center;
  font-size: 13px;
  color: var(--stone-text);
}
.keys-hint kbd {
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  font: inherit;
  font-size: 12px;
  background: var(--white);
}

/* Touch devices have no keyboard to hint at. */
@media (hover: none) {
  .keys-hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .card { animation: none; }
  .card-inner { transition: none; }
}