/* ============================================================
   FLASHCARDS.CSS — Flip Card Component
   ============================================================ */

/* ----------------------------------------------------------
   1. FLASHCARD CONTROLS
   ---------------------------------------------------------- */
.flashcard-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}

.flashcard-controls__left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.flashcard-filter {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.flashcard-filter__btn {
  padding: var(--sp-2) var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  background: var(--white);
  cursor: pointer;
  transition: all var(--transition);
}

.flashcard-filter__btn:hover,
.flashcard-filter__btn.active {
  background: var(--cambridge);
  border-color: var(--cambridge);
  color: white;
}

.flashcard-count {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: 500;
}

.flashcard-count strong {
  color: var(--text);
}

/* ----------------------------------------------------------
   2. DECK WRAPPER
   ---------------------------------------------------------- */
.flashcard-deck {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-5);
}

/* Single large card mode */
.flashcard-deck--single {
  grid-template-columns: 1fr;
  max-width: 560px;
  margin-inline: auto;
}

/* ----------------------------------------------------------
   3. FLIP CARD
   ---------------------------------------------------------- */
.flashcard {
  perspective: 1000px;
  height: 280px;
  cursor: pointer;
}

.flashcard-deck--single .flashcard {
  height: 280px;
}

.flashcard__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-lg);
}

.flashcard.flipped .flashcard__inner {
  transform: rotateY(180deg);
}

/* Card faces */
.flashcard__front,
.flashcard__back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
}

/* Front face */
.flashcard__front {
  background: var(--white);
  display: flex;
  flex-direction: column;
  padding: var(--sp-6);
  justify-content: space-between;
}

.flashcard__front-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
}

.flashcard__term {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  flex: 1;
  display: flex;
  align-items: center;
}

.flashcard__flip-hint {
  font-size: var(--text-xs);
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

/* Topic colour on front card top border */
.flashcard--kq1     .flashcard__front { border-top: 3px solid var(--kq1); }
.flashcard--kq2     .flashcard__front { border-top: 3px solid var(--kq2); }
.flashcard--kq3     .flashcard__front { border-top: 3px solid var(--kq3); }
.flashcard--germany .flashcard__front { border-top: 3px solid var(--germany); }

/* Back face */
.flashcard__back {
  background: var(--navy);
  transform: rotateY(180deg);
}

.flashcard__back-scroll {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  border-radius: var(--radius-lg);
}

.flashcard--kq1     .flashcard__back { background: #3a1c08; }
.flashcard--kq2     .flashcard__back { background: #0e2e1e; }
.flashcard--kq3     .flashcard__back { background: #2e0e0e; }
.flashcard--germany .flashcard__back { background: #1a1230; }

.flashcard__back-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.4);
}

.flashcard__definition {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.9);
  line-height: 1.6;
}

.flashcard__back-scroll::-webkit-scrollbar {
  width: 3px;
}

.flashcard__back-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.flashcard__back-scroll::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.25);
  border-radius: 3px;
}

.flashcard__example {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  font-style: italic;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--sp-3);
}

/* ----------------------------------------------------------
   4. CARD HOVER STATE
   ---------------------------------------------------------- */
.flashcard:hover .flashcard__inner {
  box-shadow: var(--shadow-lg);
}

.flashcard:not(.flipped):hover .flashcard__front {
  border-color: var(--cambridge-lt);
}

/* ----------------------------------------------------------
   5. NAVIGATION (single-card mode)
   ---------------------------------------------------------- */
.flashcard-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.flashcard-nav__btn {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--cambridge);
  cursor: pointer;
  transition: all var(--transition);
}

.flashcard-nav__btn:hover:not(:disabled) {
  background: var(--cambridge);
  color: white;
  border-color: var(--cambridge);
}

.flashcard-nav__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.flashcard-nav__progress {
  font-size: var(--text-sm);
  color: var(--text-muted);
  min-width: 80px;
  text-align: center;
}

/* ----------------------------------------------------------
   6. KEYBOARD HINT
   ---------------------------------------------------------- */
.flashcard-keyboard-hint {
  text-align: center;
  margin-top: var(--sp-4);
  font-size: var(--text-xs);
  color: var(--text-light);
}

.flashcard-keyboard-hint kbd {
  display: inline-block;
  padding: 2px var(--sp-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

/* ----------------------------------------------------------
   7. SHUFFLE / RESET CONTROLS
   ---------------------------------------------------------- */
.flashcard-actions {
  display: flex;
  justify-content: center;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

/* ----------------------------------------------------------
   8. RESPONSIVE
   ---------------------------------------------------------- */
@media (max-width: 600px) {
  .flashcard-deck {
    grid-template-columns: 1fr;
  }

  .flashcard {
    height: 240px;
  }

  .flashcard__term {
    font-size: var(--text-xl);
  }
}