/* ==========================================================================
   Gaya Tampilan Flashcard (Kartu Belajar Fisik Interaktif)
   Sesuai Antislop: Bebas Slop, Animasi Halus, Aksesibel WCAG AA
   ========================================================================== */

.flashcard-stage-container {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  padding-top: var(--space-4);
  padding-bottom: var(--space-12);
}

/* Header & Filter Dek Flashcard */
.deck-header {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.deck-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.deck-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.deck-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

/* Filter Pilihan Topik */
.deck-filter-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-surface-subtle);
}

.filter-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

.filter-pill {
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  min-height: 36px;
  transition: all 0.15s ease;
}

.filter-pill:hover {
  background-color: #ffffff;
  border-color: var(--color-border-hover);
  color: var(--color-text-primary);
}

.filter-pill.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
}

/* Progress Indikator Kartu */
.deck-progress-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.deck-progress-track {
  width: 100%;
  height: 6px;
  background-color: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.deck-progress-fill {
  height: 100%;
  background-color: var(--color-primary);
  width: 0%;
  transition: width 0.3s ease;
}

/* Stage Flashcard 3D Perspective */
.card-scene {
  perspective: 1200px;
  width: 100%;
  margin-bottom: var(--space-6);
}

.card-object {
  width: 100%;
  min-height: 360px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

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

/* Wajah Kartu (Depan & Belakang) */
.card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-object:hover .card-face {
  border-color: var(--color-border-hover);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
}

/* Sisi Depan Kartu */
.card-face-front {
  background-color: #ffffff;
}

/* Sisi Belakang Kartu */
.card-face-back {
  background-color: #fafafa;
  transform: rotateY(180deg);
  border-color: #0d9488;
}

/* Elemen di Dalam Kartu */
.card-face-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-concept-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-subtle);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.card-side-indicator {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.card-face-center {
  margin-top: var(--space-6);
  margin-bottom: var(--space-6);
  text-align: center;
}

.card-keyword-label {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.card-question-text {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.4;
}

.card-answer-text {
  font-size: 1.125rem;
  line-height: 1.65;
  color: #1e293b;
  text-align: left;
}

.card-face-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-surface-subtle);
  padding-top: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.card-flip-prompt {
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* Baris Kontrol Navigasi Dek */
.deck-controls-row {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: var(--space-3);
  align-items: center;
}

@media (max-width: 640px) {
  .deck-controls-row {
    grid-template-columns: 1fr;
  }
}

.btn-deck-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  min-height: 48px;
  transition: all 0.15s ease;
}

.btn-deck-action:hover:not(:disabled) {
  background-color: var(--color-surface-subtle);
  border-color: var(--color-border-hover);
}

.btn-deck-action:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-deck-flip {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-deck-flip:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
}

/* Tombol Akses Cepat Dek Tambahan */
.deck-secondary-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.btn-text-action {
  background: none;
  border: none;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  text-decoration: underline;
  padding: var(--space-2);
  min-height: 44px;
}

.btn-text-action:hover {
  color: var(--color-primary);
}