/* ============================================
   flashcards.css — Flashcard Mode Overlay
   ============================================ */

.flashcard-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 200ms ease;
}

.flashcard-panel {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 12px;
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

.flashcard-close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.flashcard-close-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Screens */
.flashcard-screen {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Start screen */
.flashcard-start h2 {
  font-size: 1.5rem;
  text-align: center;
}

.flashcard-start p {
  color: var(--text-secondary);
  text-align: center;
}

.flashcard-due-count {
  text-align: center;
  font-size: 0.85rem;
  color: var(--accent-orange);
  font-weight: 600;
}

.flashcard-options {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.flashcard-option-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.flashcard-option-group label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.flashcard-option-group select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: 6px;
  color: var(--text-primary);
  padding: 8px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
}

.flashcard-option-group select:focus {
  border-color: var(--accent-blue);
}

.flashcard-start-btn {
  align-self: center;
  margin-top: 8px;
}

/* Question screen */
.flashcard-progress {
  width: 100%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

.flashcard-progress-fill {
  height: 100%;
  background: var(--accent-blue);
  border-radius: 2px;
  transition: width var(--transition-normal);
}

.flashcard-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

/* Card display area */
.flashcard-card-display {
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 8px;
  text-align: center;
}

.flashcard-card-display svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.flashcard-term-name {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.flashcard-term-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Reveal area */
.flashcard-reveal-btn {
  align-self: center;
  padding: 10px 32px;
  border-radius: 6px;
  border: 1px solid var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent-blue);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.flashcard-reveal-btn:hover {
  background: rgba(88, 166, 255, 0.2);
}

.flashcard-answer {
  padding: 16px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: center;
}

/* Pattern mode choices */
.flashcard-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.flashcard-choice {
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-primary);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
}

.flashcard-choice:hover {
  border-color: var(--accent-blue);
  background: var(--bg-hover);
}

.flashcard-choice.correct {
  border-color: var(--accent-green);
  background: rgba(63, 185, 80, 0.15);
  color: var(--accent-green);
}

.flashcard-choice.wrong {
  border-color: var(--accent-red);
  background: rgba(248, 81, 73, 0.15);
  color: var(--accent-red);
}

.flashcard-choice:disabled {
  cursor: default;
  opacity: 0.8;
}

/* Grade buttons (concept mode) */
.flashcard-grade {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.flashcard-grade button {
  padding: 10px 24px;
  border-radius: 6px;
  border: 2px solid;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.grade-again {
  border-color: var(--accent-red);
  background: rgba(248, 81, 73, 0.1);
  color: var(--accent-red);
}

.grade-again:hover {
  background: rgba(248, 81, 73, 0.2);
}

.grade-hard {
  border-color: var(--accent-orange);
  background: rgba(210, 153, 34, 0.1);
  color: var(--accent-orange);
}

.grade-hard:hover {
  background: rgba(210, 153, 34, 0.2);
}

.grade-easy {
  border-color: var(--accent-green);
  background: rgba(63, 185, 80, 0.1);
  color: var(--accent-green);
}

.grade-easy:hover {
  background: rgba(63, 185, 80, 0.2);
}

/* Results screen */
.flashcard-results h2 {
  text-align: center;
  font-size: 1.3rem;
}

.flashcard-results-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 0;
  border-top: 1px solid var(--border-secondary);
  border-bottom: 1px solid var(--border-secondary);
}

.flashcard-results-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.flashcard-results-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.flashcard-results-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.flashcard-results-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding-top: 8px;
}

/* Responsive */
@media (max-width: 480px) {
  .flashcard-panel {
    padding: 20px 16px;
    max-height: 95vh;
  }

  .flashcard-choices {
    grid-template-columns: 1fr;
  }

  .flashcard-grade {
    flex-direction: column;
  }

  .flashcard-grade button {
    width: 100%;
  }

  .flashcard-results-stats {
    gap: 20px;
  }
}