/* Hangul Learning Styles */
.hangul-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

/* Hangul Tabs - Consonants, Vowels, Finals */
.hangul-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hangul-tab {
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.hangul-tab.active {
  border-color: var(--accent-primary);
  background-color: var(--accent-primary);
  color: white;
}

.hangul-tab:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.hangul-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary));
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  color: white;
  font-size: 4rem;
  font-weight: bold;
  text-align: center;
  letter-spacing: 0.05em;
}

.hangul-char {
  font-size: 8rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.hangul-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.hangul-label {
  font-size: 1.2rem;
  opacity: 0.9;
}

.hangul-label-text {
  font-size: 1.2rem;
  font-weight: 600;
}

.hangul-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  width: 100%;
}

.btn-speak {
  background-color: var(--accent-tertiary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-speak:hover {
  background-color: var(--accent-tertiary);
  opacity: 0.85;
  transform: scale(1.05);
}

.btn-speak:active {
  transform: scale(0.98);
}

.btn-next, .btn-prev {
  background-color: var(--accent-primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
}

.btn-next:hover, .btn-prev:hover {
  background-color: var(--accent-primary);
  opacity: 0.9;
  transform: scale(1.05);
}

.btn-next:active, .btn-prev:active {
  transform: scale(0.98);
}

.btn-next:disabled, .btn-prev:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hangul-navigation {
  display: flex;
  gap: 1rem;
  justify-content: center;
  width: 100%;
}

.progress-info {
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Vocabulary Styles */
.vocabulary-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.vocab-category-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.vocab-category-btn {
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
  font-weight: 600;
  color: var(--text-primary);
}

.vocab-category-btn.active {
  border-color: var(--accent-primary);
  background-color: var(--accent-primary);
  color: white;
}

.vocab-category-btn:hover {
  border-color: var(--accent-primary);
}

/* Vocabulary List Grid */
.vocab-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 모바일 기본: 3열 */
  gap: 1rem;
  max-height: calc(3 * (200px + 1rem) - 1rem);
  overflow-y: auto;
  padding-right: 0.5rem;
}

.vocab-list::-webkit-scrollbar {
  width: 10px;
}

.vocab-list::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 5px;
}

.vocab-list::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 5px;
}

.vocab-list::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

.vocab-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all var(--transition-duration) ease;
  min-height: 200px;
}

.vocab-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.vocab-korean {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.vocab-translation {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.vocab-romanization {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-tertiary);
  font-style: italic;
}

.vocab-play-btn {
  background-color: var(--accent-tertiary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-duration) ease;
  align-self: flex-start;
  margin-top: auto;
}

.vocab-play-btn:hover {
  opacity: 0.85;
  transform: scale(1.05);
}

/* Flashcard Styles */
.flashcard-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.flashcard-wrapper {
  perspective: 1000px;
  width: 100%;
  max-width: 500px;
}

.flashcard {
  width: 100%;
  aspect-ratio: 3/2;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 3.5rem;
  font-weight: bold;
  color: white;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-duration) ease;
  text-align: center;
  padding: 2rem;
  word-break: break-word;
  user-select: none;
}

.flashcard:hover {
  transform: scale(1.02);
}

.flashcard.flipped {
  background: linear-gradient(135deg, var(--accent-secondary), var(--accent-secondary));
}

.flashcard-controls {
  display: flex;
  gap: 1rem;
  justify-content: center;
  width: 100%;
  flex-wrap: wrap;
}

.btn-know {
  background-color: var(--accent-tertiary);
  color: white;
  border: none;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
}

.btn-know:hover {
  opacity: 0.9;
  transform: scale(1.05);
}

.btn-dont-know {
  background-color: var(--accent-secondary);
  color: white;
  border: none;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-duration) ease;
}

.btn-dont-know:hover {
  opacity: 0.9;
  transform: scale(1.05);
}

.flashcard-progress {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Desktop: 5열로 변경 */
@media (min-width: 1024px) {
  .vocab-list {
    grid-template-columns: repeat(5, 1fr);
  }
}