/* ==========================================================================
   QG DO CONCURSEIRO - FLASHCARDS SRS (REPETIÇÃO ESPAÇADA TÁTICA) (CSS PURO)
   ========================================================================== */

.flashcards-layout {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   LISTA DE DECKS POR DISCIPLINA
   ========================================================================== */
.deck-chips-container {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.deck-chip {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  transition: var(--transition-fast);
}

.deck-chip:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-color-light);
  color: var(--text-main);
}

.deck-chip.active {
  background-color: rgba(245, 158, 11, 0.08);
  border-color: var(--color-warning);
  color: #fbbf24;
}

.deck-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface-inset);
  color: var(--text-dimmed);
  border: 1px solid var(--border-color);
}

.deck-badge.badge-due {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.35);
  color: #f87171;
  font-weight: 800;
}

/* ==========================================================================
   PALCO 3D DO FLASHCARD (CARTÃO DE MEMÓRIA OPERACIONAL)
   ========================================================================== */
.flashcard-stage {
  perspective: 1200px;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  min-height: 360px;
}

.flashcard-3d-box {
  width: 100%;
  height: 360px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

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

.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-hud);
}

.flashcard-front {
  background: var(--bg-surface);
  border: 1px solid var(--border-color-light);
  border-top: 3px solid var(--color-primary);
}

.flashcard-back {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--color-accent);
  transform: rotateY(180deg);
}

.fc-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.fc-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  text-transform: uppercase;
}

.fc-counter {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dimmed);
  font-weight: 700;
}

.fc-card-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-main);
  padding: 16px 0;
  text-align: center;
  word-break: break-word;
  overflow-wrap: break-word;
  overflow-y: auto;
  max-height: 220px;
}

.flashcard-back .fc-card-content {
  font-size: 0.98rem;
  font-weight: 400;
  text-align: left;
  line-height: 1.6;
}

.flashcard-back .fc-card-content strong {
  color: var(--color-accent);
}

.fc-card-footer {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dimmed);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   AÇÕES DE CLASSIFICAÇÃO SRS (SUPERMEMO SM-2)
   ========================================================================== */
.flashcard-actions-wrapper {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.fc-flip-btn-row {
  display: flex;
  justify-content: center;
}

.fc-grade-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  animation: gradeFade 0.2s ease-out;
}

.fc-grade-btn {
  padding: 10px 8px;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: var(--transition-fast);
}

.fc-grade-btn span:first-child {
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.85rem;
}

.fc-grade-btn span:last-child {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  opacity: 0.85;
}

.btn-grade-0 {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.35);
  color: #f87171;
}
.btn-grade-0:hover { background: #dc2626; color: #fff; border-color: #ef4444; }

.btn-grade-3 {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.35);
  color: #fbbf24;
}
.btn-grade-3:hover { background: #d97706; color: #000; border-color: #f59e0b; font-weight: 900; }

.btn-grade-4 {
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.35);
  color: #38bdf8;
}
.btn-grade-4:hover { background: #0284c7; color: #fff; border-color: #38bdf8; }

.btn-grade-5 {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.35);
  color: #34d399;
}
.btn-grade-5:hover { background: #059669; color: #000; border-color: #10b981; font-weight: 900; }

@keyframes gradeFade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 560px) {
  .fc-grade-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}