/* ============================================
   OPIc Master - Study Page Styles
   ============================================ */

/* Filter Tabs */
.filter-tabs {
  display: flex; gap: 8px;
  margin: 24px 0 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.tab {
  padding: 10px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 0.85rem; font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}
.tab:hover { border-color: var(--accent-blue); color: var(--text-primary); }
.tab.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* Topics Grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

/* Topic Card */
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.topic-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
}
.topic-card[data-type="selected"]::before { background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple)); }
.topic-card[data-type="common"]::before { background: linear-gradient(90deg, var(--accent-green), var(--accent-gold)); }
.topic-card[data-type="roleplay"]::before { background: linear-gradient(90deg, var(--accent-pink), var(--accent-red)); }

.topic-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* Progress Status Colors */
.topic-card.status-0 { background: var(--bg-card); }
.topic-card.status-1 { background: rgba(251, 191, 36, 0.05); border-color: rgba(251, 191, 36, 0.2); }
.topic-card.status-2 { background: rgba(249, 115, 22, 0.05); border-color: rgba(249, 115, 22, 0.2); }
.topic-card.status-3 { background: rgba(59, 130, 246, 0.05); border-color: rgba(59, 130, 246, 0.2); }
.topic-card.status-4 { background: rgba(139, 92, 246, 0.05); border-color: rgba(139, 92, 246, 0.2); }
.topic-card.status-5 { background: rgba(16, 185, 129, 0.08); border-color: var(--accent-green); }

.topic-type-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.badge-selected { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.badge-common { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }
.badge-roleplay { background: rgba(236, 72, 153, 0.15); color: var(--accent-pink); }

.topic-stats {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 12px;
}
.topic-name {
  font-size: 1.1rem; font-weight: 700;
  margin-bottom: 6px;
}
.topic-count {
  color: var(--text-muted); font-size: 0.8rem;
}
.progress-badge {
  font-size: 0.72rem; font-weight: 700;
  padding: 2px 8px; border-radius: 5px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}
.status-1 .progress-badge { color: var(--accent-gold); }
.status-2 .progress-badge { color: #f97316; }
.status-3 .progress-badge { color: var(--accent-blue); }
.status-4 .progress-badge { color: var(--accent-purple); }
.status-5 .progress-badge { color: var(--accent-green); }

/* Modal Button */
.btn-complete {
  width: 100%; margin-top: 30px; padding: 14px;
  border-radius: var(--radius-sm); border: none;
  background: linear-gradient(135deg, var(--accent-gold), #f97316);
  color: white; font-family: var(--font-main);
  font-size: 1rem; font-weight: 700; cursor: pointer;
  box-shadow: 0 4px 15px rgba(251, 191, 36, 0.3);
  transition: var(--transition);
}
.btn-complete:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(251, 191, 36, 0.4); }
.btn-complete:active { transform: translateY(0); }

/* Section Title in Grid */
.section-title-row {
  grid-column: 1 / -1;
  font-size: 1rem; font-weight: 700;
  color: var(--text-secondary);
  padding: 12px 0 4px;
  border-bottom: 1px solid var(--border-color);
  margin-top: 8px;
}

/* Question Modal */
.question-modal {
  display: none;
  position: fixed; inset: 0;
  z-index: 200;
}
.question-modal.open { display: flex; align-items: flex-start; justify-content: center; padding-top: 40px; }
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
}
.modal-content {
  position: relative; z-index: 201;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  width: 90%; max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.modal-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  position: sticky; top: 0;
  background: var(--bg-secondary); z-index: 10;
}
.modal-title { font-size: 1.2rem; font-weight: 700; }
.modal-subtitle { color: var(--text-muted); font-size: 0.8rem; }
.modal-close {
  font-size: 1.5rem; background: none; border: none;
  color: var(--text-muted); cursor: pointer;
  padding: 4px 8px;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { padding: 24px; }

/* Question Item */
.question-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  overflow: hidden;
}
.question-header {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  transition: var(--transition);
}
.question-header:hover { background: rgba(255, 255, 255, 0.03); }
.diff-badge {
  padding: 3px 10px; border-radius: 6px;
  font-size: 0.7rem; font-weight: 700;
  flex-shrink: 0;
}
.diff-Int { background: rgba(59, 130, 246, 0.2); color: var(--accent-blue); }
.diff-Adv { background: rgba(239, 68, 68, 0.2); color: var(--accent-red); }
.question-num {
  background: rgba(139, 92, 246, 0.2); color: var(--accent-purple);
  padding: 3px 8px; border-radius: 6px;
  font-size: 0.7rem; font-weight: 700;
  flex-shrink: 0;
}
.question-focus { font-size: 0.9rem; font-weight: 600; flex: 1; }
.question-expand {
  color: var(--text-muted); font-size: 0.8rem; flex-shrink: 0;
  transition: transform 0.3s;
}
.question-expand.open { transform: rotate(180deg); }

.question-detail {
  max-height: 0; overflow: hidden;
  transition: max-height 0.5s ease;
}
.question-detail.open { max-height: 3000px; }

.detail-inner { padding: 0 18px 18px; }

/* Script Steps - 6 STEPS Color Coding */
.script-section {
  margin-top: 16px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.script-toggle {
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; margin-bottom: 12px;
}
.script-label {
  font-size: 0.85rem; font-weight: 700;
  color: var(--accent-gold);
}
.lang-tabs { display: flex; gap: 6px; }
.lang-tab {
  padding: 4px 12px; border-radius: 6px;
  font-size: 0.72rem; font-weight: 600;
  cursor: pointer; border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: none;
  font-family: var(--font-main);
  transition: var(--transition);
}
.lang-tab.active { border-color: var(--accent-gold); color: var(--accent-gold); background: rgba(251, 191, 36, 0.1); }
.script-content {
  font-size: 0.88rem; line-height: 1.8;
  white-space: pre-wrap;
}
.script-content .step { display: block; margin-bottom: 6px; padding: 6px 10px; border-radius: 6px; border-left: 3px solid; }
.step-1 { border-color: var(--accent-blue); background: rgba(59, 130, 246, 0.05); }
.step-2 { border-color: var(--accent-purple); background: rgba(139, 92, 246, 0.05); }
.step-3 { border-color: var(--accent-green); background: rgba(16, 185, 129, 0.05); }
.step-4 { border-color: var(--accent-gold); background: rgba(251, 191, 36, 0.05); }
.step-5 { border-color: var(--accent-pink); background: rgba(236, 72, 153, 0.05); }
.step-6 { border-color: var(--accent-red); background: rgba(239, 68, 68, 0.05); }

/* Question Text */
.q-text {
  margin-bottom: 12px; padding: 12px;
  background: rgba(59, 130, 246, 0.05);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem; line-height: 1.7;
}
.q-text-label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.72rem; font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* Tip & Vocab */
.tip-box {
  margin-top: 12px;
  padding: 12px;
  background: rgba(139, 92, 246, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(139, 92, 246, 0.15);
}
.tip-label { font-size: 0.75rem; font-weight: 700; color: var(--accent-purple); margin-bottom: 4px; }
.tip-text { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

.vocab-box {
  margin-top: 12px;
  padding: 12px;
  background: rgba(16, 185, 129, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(16, 185, 129, 0.15);
}
.vocab-label { font-size: 0.75rem; font-weight: 700; color: var(--accent-green); margin-bottom: 4px; }
.vocab-text { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.8; white-space: pre-wrap; }

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .topics-grid { grid-template-columns: 1fr; }
  .filter-tabs { gap: 6px; }
  .tab { padding: 8px 14px; font-size: 0.8rem; }
  .modal-content { width: 95%; margin-top: 20px; }
}

/* TTS UI */
.tts-btn {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: transform 0.2s, color 0.2s;
  background: none;
  border: none;
  color: inherit;
  padding: 0 4px;
}
.tts-btn[data-type="question"] {
  font-size: 1.1rem;
}
.tts-btn:hover {
  transform: scale(1.15);
}
.tts-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(0, 0, 0, 0.15);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.tts-controls .tts-btn {
  font-size: 0.8rem;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
}
.tts-controls .tts-btn:hover {
  background: rgba(59, 130, 246, 0.15);
  color: var(--text-primary);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}
.tts-speed-slider {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}
.tts-speed {
  width: 70px;
  accent-color: var(--accent-blue);
}