/* ==========================================================================
   ATPL CBT Flashcard (Quizlet-style 3D Flip) Mode Styling
   ========================================================================== */

.flashcard-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  gap: 1.25rem;
}

/* Flashcard Progress */
.fc-progress-card {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.8rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.fc-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.fc-counter-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.fc-badge-known {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-green);
  font-weight: 700;
  font-family: var(--font-mono);
}

.fc-badge-review {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-amber);
  font-weight: 700;
  font-family: var(--font-mono);
}

.fc-bar-track {
  width: 100%;
  height: 6px;
  background-color: var(--bg-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  display: flex;
}

.fc-bar-fill-known {
  background-color: var(--accent-green);
  transition: width 0.3s ease;
}

.fc-bar-fill-review {
  background-color: var(--accent-amber);
  transition: width 0.3s ease;
}

/* 3D Card Scene */
.card-scene {
  width: 100%;
  min-height: 500px;
  perspective: 1200px;
  cursor: pointer;
}

.card-inner {
  width: 100%;
  min-height: 500px;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-lg);
}

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

.card-face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  background-color: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  overflow-y: auto;
}

.card-face:hover {
  border-color: var(--accent-cyan);
}

/* Card Front Face */
.card-face-front {
  border-top: 4px solid var(--accent-cyan);
}

.card-face-back {
  transform: rotateY(180deg);
  border-top: 4px solid var(--accent-green);
  background-color: #0b1120;
}

.fc-hint-tap {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}

.fc-hint-tap kbd {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Card Back Answer Badge */
.fc-correct-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background-color: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent-green);
  border-radius: var(--radius-md);
  color: var(--accent-green);
  font-weight: 800;
  font-size: 1.1rem;
}

/* Action Sorting Buttons */
.fc-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  width: 100%;
}

.btn-sort {
  flex: 1;
  max-width: 240px;
  padding: 1rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 800;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-md);
}

.btn-sort kbd {
  font-size: 0.7rem;
  font-weight: 600;
  opacity: 0.8;
  font-family: var(--font-mono);
}

.btn-sort-review {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.4);
  color: var(--accent-amber);
}
.btn-sort-review:hover {
  background-color: rgba(245, 158, 11, 0.2);
  border-color: var(--accent-amber);
  transform: translateY(-2px);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.3);
}

.btn-sort-know {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--accent-green);
}
.btn-sort-know:hover {
  background-color: rgba(16, 185, 129, 0.2);
  border-color: var(--accent-green);
  transform: translateY(-2px);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.3);
}

@media (max-width: 768px) {
  .flashcard-container {
    gap: 0.5rem;
    width: 100%;
    max-width: 100%;
  }

  .fc-progress-card {
    padding: 0.4rem 0.65rem;
    gap: 0.3rem;
  }

  .card-scene, .card-inner {
    min-height: calc(100dvh - 230px);
    max-height: calc(100dvh - 230px);
  }

  .card-face {
    padding: 0.85rem;
    gap: 0.65rem;
  }

  .fc-options-list {
    gap: 0.35rem !important;
    margin: 0.35rem 0 !important;
  }

  .fc-options-list > div {
    padding: 0.35rem 0.55rem !important;
    font-size: 0.82rem !important;
    line-height: 1.35 !important;
  }

  .fc-hint-tap {
    padding-top: 0.4rem;
    font-size: 0.72rem;
  }

  .fc-correct-header {
    padding: 0.45rem 0.75rem;
    font-size: 0.95rem;
  }

  .fc-actions {
    gap: 0.5rem;
    width: 100%;
  }

  .btn-sort {
    flex: 1;
    max-width: none;
    padding: 0.55rem 0.4rem;
    font-size: 0.85rem;
    border-radius: var(--radius-md);
    gap: 0.15rem;
  }

  .btn-sort kbd {
    font-size: 0.65rem;
  }
}