/* Flash cards — pure CSS flip cards (checkbox hack, no JavaScript).
   Used by the flashcards/flashcard shortcodes. */

.flashcards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.6rem;
  margin: 2.4rem 0;
  counter-reset: flashcard;
}

.flashcard {
  position: relative;
  display: block;
  height: 240px;
  margin: 0;
  perspective: 1000px;
  cursor: pointer;
  counter-increment: flashcard;
  font-weight: normal;
  -webkit-tap-highlight-color: transparent;
}

.flashcard > input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.flashcard-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
}

.flashcard > input:checked ~ .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard:has(> input:focus-visible) {
  outline: 2px solid #5c8b59;
  outline-offset: 3px;
  border-radius: 8px;
}

.flashcard-face {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  padding: 1.4rem 1.6rem;
  border: 1px solid #e4e4e4;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow-y: auto;
}

.flashcard-back {
  transform: rotateY(180deg);
  background: #f4f8f4;
  border-color: #cfdccd;
}

.flashcard-label {
  flex-shrink: 0;
  font-size: 0.65em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #999;
}

.flashcard-front .flashcard-label::after {
  content: ' ' counter(flashcard);
}

.flashcard-back .flashcard-label {
  color: #5c8b59;
}

.flashcard-text {
  margin: auto 0;
  padding: 0.8rem 0;
  font-size: 0.8em;
  line-height: 1.5;
}

.flashcard-text p {
  margin: 0;
}

.flashcard-hint {
  flex-shrink: 0;
  font-size: 0.6em;
  text-align: right;
  color: #bbb;
}

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

/* Dark mode (Bilberry theme toggles .dark-mode on the root) */
.dark-mode .flashcard-face {
  background: #222;
  border-color: #545454;
  box-shadow: none;
  color: #aaa;
}

.dark-mode .flashcard-back {
  background: #26302a;
  border-color: #4a5f4d;
}

.dark-mode .flashcard-label {
  color: #888;
}

.dark-mode .flashcard-back .flashcard-label {
  color: #7db479;
}

.dark-mode .flashcard-hint {
  color: #666;
}