.flashcards {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-4) 0;
}

.flashcard {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 3 / 2;
  perspective: 1400px;
  cursor: pointer;
}

.flashcard__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--dur-med) var(--ease-out-expo);
}

.flashcard[aria-pressed="true"] .flashcard__inner {
  transform: rotateY(180deg);
}

.flashcard__face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6) var(--space-8);
  text-align: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  line-height: var(--lh-heading);
}

.flashcard__face--front {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-strong);
  letter-spacing: -0.01em;
}

.flashcard__face--back {
  transform: rotateY(180deg);
  background: var(--accent);
  border-color: var(--accent-strong);
  color: var(--bg);
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.flashcards__eval {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  width: 100%;
  max-width: 480px;
}

.flashcards__eval[hidden] {
  display: none;
}

.flashcards__eval-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-4);
  min-height: 56px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--bg);
  letter-spacing: 0.01em;
  transition: transform var(--dur-fast) var(--ease-out-expo),
              filter var(--dur-fast) var(--ease-out-expo);
}

.flashcards__eval-btn--ok {
  background: var(--nature);
}
.flashcards__eval-btn--ko {
  background: var(--danger);
}

@media (hover: hover) and (pointer: fine) {
  .flashcards__eval-btn:hover {
    filter: brightness(0.95);
  }
}
.flashcards__eval-btn:active {
  transform: translateY(1px);
}

.flashcards__hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--space-2);
}

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