/* ======== CHINESE LANGUAGE STYLES ======== */
/* Warm orange/gold Chinese theme */

/* ---- ANIMATIONS ---- */
@keyframes cn-fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes cn-flip {
  0%   { transform: rotateY(0deg); }
  50%  { transform: rotateY(90deg); }
  100% { transform: rotateY(0deg); }
}

@keyframes cn-glow {
  0%, 100% { text-shadow: 0 0 4px rgba(245, 158, 66, 0.3); }
  50%      { text-shadow: 0 0 20px rgba(245, 158, 66, 0.7); }
}

/* ---- HOME SCREEN ---- */
.cn-home {
  max-width: 700px;
  margin: 0 auto;
  padding-bottom: var(--space-8);
}

.cn-header {
  margin-bottom: var(--space-4);
}

.cn-home h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin: var(--space-2) 0 var(--space-1);
}

/* Stats bar */
.cn-stats-bar {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}

.cn-stat-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-2);
  border-radius: var(--radius-full, 50px);
  font-size: var(--text-sm);
  font-weight: 600;
}

/* ---- SECTION HEADERS ---- */
.cn-section-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin: var(--space-5) 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid #f59e42;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.cn-subtitle {
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

/* ---- LESSON BUTTONS ---- */
.cn-tier-group {
  margin-bottom: var(--space-3);
}
.cn-tier-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.cn-lesson-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-2);
}
.cn-lesson-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  background: var(--color-surface, #fff);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  position: relative;
}
.cn-lesson-btn:hover {
  border-color: #f59e42;
  box-shadow: 0 0 8px rgba(245, 158, 66, 0.2);
  transform: translateY(-2px);
}
.cn-lesson-btn.completed {
  border-color: var(--feedback-completed-border);
  background: var(--feedback-completed-bg);
}
.cn-lesson-btn.locked {
  opacity: 0.45;
  cursor: not-allowed;
  filter: grayscale(0.5);
  background: #f1f5f9;
}
.cn-completed-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #22c55e;
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  position: absolute;
  top: 6px;
  right: 6px;
}
.cn-lesson-emoji {
  font-size: 1.8rem;
}
.cn-lesson-name {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-text);
}
.cn-tier-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  color: #f59e42;
  background: rgba(245, 158, 66, 0.12);
  padding: 2px 8px;
  border-radius: 10px;
}

/* ---- CARD GRID ---- */
.cn-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.cn-activity-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  position: relative;
  overflow: hidden;
}

.cn-activity-card:hover:not(.locked) {
  transform: translateY(-3px);
  border-color: #f59e42;
  box-shadow: 0 0 20px rgba(245, 158, 66, 0.25), 0 6px 20px rgba(0, 0, 0, 0.08);
}

.cn-activity-card.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.cn-lock-overlay {
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 1.2rem;
  background: rgba(0,0,0,0.6);
  color: #fff;
  border-radius: 8px;
  padding: 2px 8px;
  font-weight: 600;
}

.cn-card-emoji {
  font-size: 2.5rem;
  flex-shrink: 0;
  line-height: 1;
}

.cn-card-body {
  flex: 1;
  min-width: 0;
}

.cn-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin: 0 0 var(--space-1);
}

.cn-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-2);
}

.cn-card-progress {
  font-size: var(--text-xs);
  color: #f59e42;
  font-weight: 600;
}

/* ---- LESSON VIEWER ---- */
.cn-lesson-card {
  background: #232a35;
  border: 2px solid #334155;
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  color: #f3f4f6;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.cn-lesson-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin: 0 0 var(--space-3);
  color: #f59e42;
}

.cn-lesson-body {
  font-size: var(--text-base);
  line-height: 1.7;
  color: #f3f4f6;
}
.cn-lesson-body strong {
  color: #f59e42;
}

.cn-lesson-visual {
  text-align: center;
  margin: var(--space-4) 0;
  line-height: 1;
  padding: var(--space-4);
  background: #1a1f2b;
  border-radius: 12px;
  border: 1px solid #334155;
}

/* ---- QUIZ ---- */
.cn-question-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}

.cn-q-badge {
  display: inline-block;
  background: rgba(245, 158, 66, 0.12);
  color: #f59e42;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 10px;
  margin-bottom: var(--space-3);
}

.cn-q-prompt {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-4);
  color: var(--color-text);
  animation: cn-glow 2s ease-in-out infinite;
}

.cn-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cn-option-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md, 12px);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  text-align: left;
  width: 100%;
}

.cn-option-btn:hover:not(:disabled) {
  border-color: #f59e42;
  background: rgba(245, 158, 66, 0.08);
}

.cn-option-btn.correct {
  border-color: var(--feedback-correct-border, #4ade80) !important;
  background: var(--feedback-correct-bg) !important;
  color: var(--feedback-correct-text);
}

.cn-option-btn.wrong {
  border-color: var(--feedback-wrong-border, #ef4444) !important;
  background: var(--feedback-wrong-bg) !important;
  color: var(--feedback-wrong-text);
}

.cn-option-btn:disabled { cursor: default; opacity: 0.7; }

/* Quiz game styles */
.cn-quiz-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}
.cn-correct-badge {
  font-weight: 600;
  color: #16a34a;
  font-size: var(--text-base);
}
.cn-counter-badge {
  font-weight: 600;
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}
.cn-type-label {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}
.cn-question-display {
  text-align: center;
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-lg, 16px);
  border: 2px solid var(--color-border);
}
.cn-question-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}
.cn-question-text.large {
  font-size: 2.5rem;
}
.cn-question-pinyin {
  font-size: var(--text-base);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
}
.cn-quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.cn-quiz-option-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md, 12px);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  text-align: left;
  width: 100%;
}
.cn-quiz-option-btn:hover:not(:disabled) {
  border-color: #f59e42;
  background: rgba(245, 158, 66, 0.08);
}
.cn-quiz-option-btn.correct {
  border-color: var(--feedback-correct-border, #4ade80) !important;
  background: var(--feedback-correct-bg) !important;
  color: var(--feedback-correct-text);
}
.cn-quiz-option-btn.wrong {
  border-color: var(--feedback-wrong-border, #ef4444) !important;
  background: var(--feedback-wrong-bg) !important;
  color: var(--feedback-wrong-text);
}
.cn-quiz-option-btn:disabled { cursor: default; opacity: 0.7; }
.cn-quiz-option-btn.cn-chars {
  font-size: 1.5rem;
}
.cn-feedback {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md, 12px);
  margin-top: var(--space-3);
  font-weight: 600;
}
.cn-feedback.correct {
  background: var(--feedback-correct-bg);
  color: var(--feedback-correct-text);
  border: 2px solid var(--feedback-correct-border, #4ade80);
}
.cn-feedback.wrong {
  background: var(--feedback-wrong-bg);
  color: var(--feedback-wrong-text);
  border: 2px solid var(--feedback-wrong-border, #ef4444);
}
.cn-feedback-title {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}
.cn-feedback-detail {
  font-weight: 500;
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.cn-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(245, 158, 66, 0.12);
  color: #f59e42;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.cn-explain-box {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md, 12px);
  background: rgba(245, 158, 66, 0.08);
  border: 1px solid rgba(245, 158, 66, 0.2);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.cn-results-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
}

.cn-results-card h2 {
  font-family: var(--font-display);
  margin: 0 0 var(--space-2);
}

.cn-auto-return {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  margin-bottom: var(--space-3);
}

/* ---- FLASHCARD / LEARN MODE ---- */
.cn-flashcard {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-6);
  text-align: center;
  max-width: 400px;
  margin: 0 auto var(--space-4);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.15s, box-shadow 0.15s;
}

.cn-flashcard:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 158, 66, 0.15);
}

.cn-flashcard-char {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-3);
  animation: cn-glow 2.5s ease-in-out infinite;
}

.cn-flashcard-pinyin {
  font-size: var(--text-lg);
  color: #f59e42;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.cn-flashcard-meaning {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.cn-flashcard-category {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full, 50px);
  background: rgba(245, 158, 66, 0.12);
  color: #f59e42;
  margin-top: var(--space-1);
}

/* ---- CATEGORY PICKER ---- */
.cn-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.cn-category-btn,
.cn-cat-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md, 12px);
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-sm);
  font-family: inherit;
  transition: all 0.15s;
}

.cn-category-btn:hover,
.cn-cat-btn:hover {
  border-color: #f59e42;
  transform: translateY(-2px);
}

.cn-category-btn.selected,
.cn-cat-btn.active {
  border-color: #f59e42;
  background: rgba(245, 158, 66, 0.1);
  box-shadow: 0 0 12px rgba(245, 158, 66, 0.25);
}

.cn-category-icon {
  font-size: 1.8rem;
}

/* ---- QUIZ MODE PICKER ---- */
.cn-mode-grid,
.cn-mode-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.cn-mode-card,
.cn-mode-btn {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: inherit;
  color: var(--color-text);
  text-align: center;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.cn-mode-card:hover,
.cn-mode-btn:hover {
  transform: translateY(-3px);
  border-color: #f59e42;
  box-shadow: 0 0 20px rgba(245, 158, 66, 0.25), 0 6px 20px rgba(0, 0, 0, 0.08);
}

.cn-mode-icon {
  font-size: 2rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 158, 66, 0.1);
  border-radius: 12px;
  flex-shrink: 0;
}

.cn-mode-info {
  flex: 1;
}

.cn-mode-name {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 2px;
}

.cn-mode-desc {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.cn-setup-label {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin: var(--space-4) 0 var(--space-3);
}

/* ---- WORD MATCH GAME ---- */
.cn-match-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.cn-match-card {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md, 12px);
  font-size: 1.5rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.3s, border-color 0.15s, box-shadow 0.15s;
  transform-style: preserve-3d;
  perspective: 600px;
}

.cn-match-card:hover:not(.matched) {
  border-color: #f59e42;
  box-shadow: 0 0 12px rgba(245, 158, 66, 0.2);
}

.cn-match-card.flipped {
  animation: cn-flip 0.5s ease;
  border-color: #f59e42;
  background: rgba(245, 158, 66, 0.08);
}

.cn-match-card.matched {
  border-color: var(--feedback-completed-border);
  background: var(--feedback-completed-bg);
  cursor: default;
  opacity: 0.7;
}

/* ---- NAVIGATION & ACTIVITY SCREENS ---- */
.cn-nav-buttons {
  display: flex;
  gap: var(--space-3);
  justify-content: space-between;
  margin-top: var(--space-4);
}
.cn-nav-buttons .cn-btn {
  flex: 1;
  text-align: center;
}
.cn-nav-buttons .cn-btn.primary {
  background: #f59e42;
  border-color: #f59e42;
}

.cn-btn {
  padding: 10px 20px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  background: var(--color-surface, #fff);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.2s;
  font-family: inherit;
}
.cn-btn:hover {
  border-color: #f59e42;
  background: rgba(245, 158, 66, 0.08);
}
.cn-btn.primary {
  background: #f59e42;
  color: white;
  border-color: #f59e42;
}
.cn-btn.primary:hover {
  background: #e08c30;
}
.cn-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.cn-activity-screen {
  max-width: 600px;
  margin: 0 auto;
  padding-bottom: var(--space-8);
  animation: cn-fadeIn 0.35s ease;
}

.cn-activity-top {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.cn-activity-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin: 0;
}

.cn-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}
.cn-progress-fill {
  height: 100%;
  background: #f59e42;
  border-radius: 4px;
  transition: width 0.3s;
}

.cn-score-display {
  font-weight: 700;
  color: #f59e42;
  font-size: 0.9rem;
}

.cn-study-counter {
  color: var(--color-text-faint);
  font-size: 0.85rem;
  margin-bottom: var(--space-2);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 600px) {
  .cn-card-grid {
    grid-template-columns: 1fr;
  }

  .cn-match-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cn-category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cn-mode-grid {
    grid-template-columns: 1fr;
  }

  .cn-lesson-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .cn-lesson-heading {
    font-size: var(--text-lg);
  }

  .cn-q-prompt {
    font-size: 2rem;
  }

  .cn-flashcard-char {
    font-size: 3rem;
  }

  .cn-nav-buttons {
    flex-direction: column;
  }

  .cn-nav-buttons .cn-btn {
    width: 100%;
  }
}