/* ===== 数据的分析交互实验室样式 ===== */
:root {
  --bg-primary: #0a0f1c;
  --bg-secondary: #111827;
  --bg-card: #1f2937;
  --accent: #f59e0b;
  --accent2: #3b82f6;
  --accent3: #10b981;
  --accent4: #8b5cf6;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

.container { max-width: 1200px; margin: 0 auto; padding: 1rem; }

.lab-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 1.5rem;
}

.back-btn {
  background: rgba(255,255,255,0.1); border: none; color: var(--text-primary);
  padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; font-size: 0.9rem; transition: background 0.2s;
}
.back-btn:hover { background: rgba(255,255,255,0.2); }

.lab-title { font-size: 1.5rem; font-weight: 700; }

.mastery-badge {
  background: linear-gradient(135deg, var(--accent3), var(--accent2));
  padding: 0.5rem 1rem; border-radius: 20px; font-weight: 600; font-size: 0.9rem;
}

.progress-track {
  display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem;
  padding: 1rem; background: var(--bg-card); border-radius: 12px; border: 1px solid rgba(255,255,255,0.08);
}
.progress-step {
  flex: 1; height: 8px; background: rgba(255,255,255,0.1); border-radius: 4px;
  position: relative; cursor: pointer; transition: all 0.3s;
}
.progress-step.completed { background: var(--success); }
.progress-step.active { background: var(--accent); box-shadow: 0 0 12px rgba(245,158,11,0.4); }
.progress-step-label {
  position: absolute; top: -22px; left: 50%; transform: translateX(-50%);
  font-size: 0.7rem; font-weight: 600; white-space: nowrap; color: var(--text-secondary);
}
.progress-step.active .progress-step-label { color: var(--accent); }
.progress-step.completed .progress-step-label { color: var(--success); }

.module-tabs {
  display: flex; gap: 0.5rem; margin-bottom: 1.5rem; flex-wrap: wrap;
}
.module-tab {
  background: var(--bg-card); border: 2px solid transparent; color: var(--text-secondary);
  padding: 0.75rem 1.25rem; border-radius: 12px; cursor: pointer; font-size: 0.95rem; font-weight: 500;
  transition: all 0.2s; display: flex; align-items: center; gap: 0.5rem;
}
.module-tab:hover { border-color: rgba(255,255,255,0.2); color: var(--text-primary); }
.module-tab.active {
  background: linear-gradient(135deg, var(--accent2), var(--accent4)); color: white; border-color: transparent;
}
.module-tab .tab-icon { font-size: 1.1rem; }

.module-content { display: none; animation: fadeIn 0.3s ease; }
.module-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.module-card {
  background: var(--bg-card); border-radius: 16px; padding: 1.5rem; margin-bottom: 1.5rem;
}
.module-header {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.module-num {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent2), var(--accent4));
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
}
.module-title { font-size: 1.25rem; font-weight: 600; }
.module-desc { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }

.interactive-canvas {
  background: var(--bg-secondary); border-radius: 12px; overflow: hidden; position: relative;
}
.canvas-toolbar {
  display: flex; gap: 0.5rem; padding: 0.75rem;
  background: rgba(0,0,0,0.3); border-bottom: 1px solid rgba(255,255,255,0.1); flex-wrap: wrap;
}
.canvas-btn {
  background: rgba(255,255,255,0.1); border: none; color: var(--text-primary);
  padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; font-size: 0.85rem;
  transition: all 0.2s; display: flex; align-items: center; gap: 0.5rem;
}
.canvas-btn:hover { background: rgba(255,255,255,0.2); }
.canvas-btn.active { background: var(--accent2); }
.canvas-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.canvas-btn.primary { background: linear-gradient(135deg, var(--accent2), var(--accent4)); }
.canvas-btn.primary:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4); }

.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem; padding: 1rem; background: rgba(0,0,0,0.2); border-radius: 12px; margin-top: 1rem;
}
.stat-card {
  background: rgba(255,255,255,0.05); border-radius: 12px; padding: 0.75rem;
  text-align: center; border: 1px solid rgba(255,255,255,0.08);
}
.stat-value {
  display: block; font-size: 1.6rem; font-weight: 700; color: var(--accent2); margin-bottom: 0.25rem;
}
.stat-label { font-size: 0.8rem; color: var(--text-secondary); }

.param-panel {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem; padding: 1rem; background: rgba(0,0,0,0.2); border-radius: 12px; margin-top: 1rem;
}
.param-item { display: flex; flex-direction: column; gap: 0.5rem; }
.param-label { display: flex; justify-content: space-between; font-size: 0.9rem; color: var(--text-secondary); }
.param-value { font-weight: 600; color: var(--accent); }
.param-slider {
  width: 100%; height: 8px; border-radius: 4px; background: rgba(255,255,255,0.1);
  outline: none; -webkit-appearance: none;
}
.param-slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent2); cursor: pointer; transition: transform 0.2s;
}
.param-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

.formula-display {
  display: flex; align-items: center; justify-content: center; gap: 1rem;
  padding: 1.5rem; background: rgba(0,0,0,0.3); border-radius: 12px; margin-top: 1rem;
  font-size: 1.5rem; font-family: 'Times New Roman', serif; flex-wrap: wrap;
}
.formula-term { display: flex; flex-direction: column; align-items: center; gap: 0.25rem; }
.formula-term .value { font-size: 2rem; font-weight: 700; }
.formula-term .label { font-size: 0.85rem; color: var(--text-secondary); }
.formula-plus, .formula-eq { font-size: 1.6rem; color: var(--text-secondary); }
.formula-term.a .value { color: var(--accent2); }
.formula-term.b .value { color: var(--accent3); }
.formula-term.c .value { color: var(--accent); }

.feature-status {
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
  padding: 1rem; border-radius: 12px; margin-top: 1rem; font-weight: 600; font-size: 1.05rem;
  background: rgba(59, 130, 246, 0.15); color: #93c5fd;
}

.step-controls {
  display: flex; align-items: center; justify-content: center; gap: 1rem;
  padding: 1rem; background: rgba(0,0,0,0.3); border-radius: 12px; margin-top: 1rem; flex-wrap: wrap;
}
.step-btn {
  background: rgba(255,255,255,0.1); border: none; color: var(--text-primary);
  padding: 0.75rem 1.5rem; border-radius: 8px; cursor: pointer; font-size: 0.95rem;
  transition: all 0.2s; display: flex; align-items: center; gap: 0.5rem;
}
.step-btn:hover:not(:disabled) { background: rgba(255,255,255,0.2); }
.step-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.step-btn.play-btn { background: linear-gradient(135deg, var(--accent2), var(--accent4)); padding: 0.75rem 2rem; }
.step-btn.play-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4); }
.step-dots { display: flex; gap: 0.5rem; }
.step-dot {
  width: 12px; height: 12px; border-radius: 50%; background: rgba(255,255,255,0.2);
  cursor: pointer; transition: all 0.2s;
}
.step-dot:hover { background: rgba(255,255,255,0.4); }
.step-dot.active { background: var(--accent2); transform: scale(1.3); }
.step-dot.done { background: var(--success); }

.subtitle-bar {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid rgba(59, 130, 246, 0.3); border-radius: 12px; padding: 1rem 1.5rem;
  margin-top: 1rem; font-size: 1.1rem; line-height: 1.6; min-height: 60px;
  display: flex; align-items: center; justify-content: center; text-align: center;
}
.subtitle-bar.speaking { animation: subtitlePulse 1s ease infinite; }
@keyframes subtitlePulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4); } 50% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); } }

.proof-workspace { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.proof-palette, .proof-canvas { background: var(--bg-secondary); border-radius: 12px; padding: 1rem; }
.proof-palette h4, .proof-canvas h4 { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 1rem; text-align: center; }
.proof-stats {
  display: flex; justify-content: space-between; align-items: center; margin-top: 1rem;
  padding: 0.75rem 1rem; background: rgba(0,0,0,0.2); border-radius: 12px;
  font-size: 0.9rem; color: var(--text-secondary); flex-wrap: wrap; gap: 0.5rem;
}
.proof-stats b { color: var(--text-primary); }
.proof-stats .canvas-btn { margin-left: auto; }

.practice-container { max-width: 800px; margin: 0 auto; }
.practice-progress {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 1rem; font-size: 0.9rem; color: var(--text-secondary);
}
.practice-card { background: var(--bg-secondary); border-radius: 16px; padding: 2rem; margin-bottom: 1rem; }
.practice-question { font-size: 1.25rem; line-height: 1.6; margin-bottom: 1.5rem; }
.practice-options { display: grid; gap: 0.75rem; }
.practice-option {
  background: rgba(255,255,255,0.05); border: 2px solid rgba(255,255,255,0.1);
  border-radius: 12px; padding: 1rem 1.25rem; cursor: pointer; transition: all 0.2s;
  font-size: 1rem; display: flex; align-items: center; gap: 0.75rem;
}
.practice-option:hover { border-color: var(--accent2); background: rgba(59, 130, 246, 0.1); }
.practice-option.selected { border-color: var(--accent2); background: rgba(59, 130, 246, 0.2); }
.practice-option.correct { border-color: var(--success); background: rgba(16, 185, 129, 0.2); }
.practice-option.wrong { border-color: var(--error); background: rgba(239, 68, 68, 0.2); }
.option-letter {
  width: 28px; height: 28px; border-radius: 50%; background: rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 0.85rem;
}
.practice-option.correct .option-letter { background: var(--success); }
.practice-option.wrong .option-letter { background: var(--error); }
.practice-feedback {
  padding: 1rem 1.25rem; border-radius: 12px; margin-top: 1rem; display: none;
}
.practice-feedback.show { display: block; }
.practice-feedback.correct { background: rgba(16, 185, 129, 0.2); border: 1px solid var(--success); }
.practice-feedback.wrong { background: rgba(239, 68, 68, 0.2); border: 1px solid var(--error); }
.practice-hint {
  margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.9rem; color: var(--text-secondary);
}
.practice-actions { display: flex; gap: 0.75rem; margin-top: 1.5rem; }
.practice-btn {
  flex: 1; padding: 1rem; border-radius: 12px; border: none; font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
}
.practice-btn.submit { background: linear-gradient(135deg, var(--accent2), var(--accent4)); color: white; }
.practice-btn.submit:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4); }
.practice-btn.submit:disabled { opacity: 0.5; cursor: not-allowed; }
.practice-btn.next { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.practice-btn.next:hover { background: rgba(255,255,255,0.2); }

.game-header {
  display: flex; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap;
}
.game-stat {
  background: var(--bg-secondary); border-radius: 12px; padding: 0.6rem 1rem;
  display: flex; align-items: center; gap: 0.5rem; font-size: 0.95rem; color: var(--text-secondary);
  flex: 1; justify-content: center; min-width: 120px;
}
.game-stat-icon { font-size: 1.1rem; }
.game-stat b { color: var(--text-primary); }
.level-progress-wrap { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.level-progress-bar { flex: 1; height: 10px; background: rgba(255,255,255,0.1); border-radius: 5px; overflow: hidden; }
.level-progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent2), var(--accent3)); border-radius: 5px; transition: width 0.4s ease; }
.level-progress-text { font-size: 0.85rem; color: var(--text-secondary); white-space: nowrap; }
.badges-panel { background: var(--bg-secondary); border-radius: 16px; padding: 1.25rem; margin-top: 1rem; }
.badges-panel h4 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--text-primary); }
.badges-list { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.badge {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px; padding: 0.4rem 0.9rem; font-size: 0.85rem; color: var(--text-secondary);
  display: flex; align-items: center; gap: 0.4rem; transition: all 0.3s;
}
.badge.earned {
  background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.05));
  border-color: var(--accent); color: #fbbf24; box-shadow: 0 0 12px rgba(245,158,11,0.2);
  animation: badgePop 0.5s ease-out;
}
@keyframes badgePop { 0% { transform: scale(0.7); opacity: 0; } 60% { transform: scale(1.15); } 100% { transform: scale(1); opacity: 1; } }

.game-modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center; z-index: 2000;
  padding: 1rem; backdrop-filter: blur(4px);
}
.game-modal-content {
  background: var(--bg-card); border-radius: 20px; padding: 2rem; max-width: 420px;
  width: 100%; text-align: center; border: 1px solid rgba(255,255,255,0.1);
  animation: modalIn 0.4s ease-out;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(20px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }
.game-modal-icon { font-size: 3.5rem; margin-bottom: 0.5rem; }
.game-modal-content h3 { font-size: 1.4rem; margin-bottom: 0.5rem; }
.game-modal-content p { color: var(--text-secondary); margin-bottom: 1.25rem; }
.game-modal-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 1.5rem; }
.game-modal-stat {
  background: rgba(0,0,0,0.2); border-radius: 12px; padding: 0.75rem;
  display: flex; flex-direction: column; align-items: center;
}
.game-modal-stat .value { font-size: 1.3rem; font-weight: 700; color: var(--accent2); }
.game-modal-stat .label { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.25rem; }
.game-modal-actions { display: flex; gap: 0.75rem; }

.ext-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.ext-card {
  background: var(--bg-secondary); border-radius: 16px; padding: 1.25rem; cursor: pointer;
  border: 1px solid rgba(255,255,255,0.08); transition: all 0.2s;
}
.ext-card:hover { transform: translateY(-3px); border-color: var(--accent2); }
.ext-card h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--text-primary); }
.ext-card .ext-preview { font-size: 0.85rem; color: var(--text-secondary); }
.ext-detail { background: var(--bg-secondary); border-radius: 16px; padding: 1.5rem; }
.ext-back {
  background: rgba(255,255,255,0.1); border: none; color: var(--text-primary);
  padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; margin-bottom: 1rem;
}
.ext-grid-mini { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.75rem; margin-top: 0.75rem; }
.ext-mini-card {
  background: rgba(0,0,0,0.2); border-radius: 12px; padding: 0.75rem; text-align: center;
}
.ext-mini-card .triple-val { display: block; font-size: 1.1rem; font-weight: 700; color: var(--accent2); margin-bottom: 0.25rem; }
.ext-mini-card .triple-desc { font-size: 0.8rem; color: var(--text-secondary); }
.formula-box {
  background: rgba(0,0,0,0.3); border-radius: 12px; padding: 1rem; text-align: center;
  font-family: 'Times New Roman', serif; font-size: 1.2rem; margin: 0.75rem 0;
}
.example-box {
  background: rgba(59, 130, 246, 0.1); border-left: 4px solid var(--accent2);
  border-radius: 8px; padding: 0.75rem 1rem; font-size: 0.95rem; color: var(--text-secondary);
}
.proof-steps { display: grid; gap: 0.5rem; margin-top: 0.75rem; }
.proof-step { background: rgba(0,0,0,0.2); border-radius: 8px; padding: 0.75rem 1rem; font-size: 0.95rem; }
.compare-box { display: flex; align-items: center; gap: 1rem; margin: 1rem 0; flex-wrap: wrap; }
.compare-item { flex: 1; background: rgba(0,0,0,0.2); border-radius: 12px; padding: 1rem; min-width: 120px; }
.compare-item h5 { font-size: 0.9rem; color: var(--accent2); margin-bottom: 0.25rem; }
.compare-arrow { font-size: 1.5rem; color: var(--text-secondary); }

.deep-tabs-container { margin-top: 1rem; }
.deep-tab-bar { display: flex; gap: 0.5rem; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.deep-tab-btn {
  background: rgba(255,255,255,0.05); border: none; color: var(--text-secondary);
  padding: 0.6rem 1rem; border-radius: 8px; cursor: pointer; font-size: 0.9rem; transition: all 0.2s;
}
.deep-tab-btn:hover { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.deep-tab-btn.active { background: var(--accent2); color: white; }
.deep-tab-panel { display: none; }
.deep-tab-panel.active { display: block; animation: fadeIn 0.3s ease; }
.timeline { display: flex; flex-direction: column; gap: 1rem; }
.timeline-item { display: flex; gap: 1rem; }
.timeline-date {
  width: 90px; flex-shrink: 0; text-align: right; font-weight: 700; color: var(--accent2); font-size: 0.9rem;
}
.timeline-body { flex: 1; background: rgba(0,0,0,0.2); border-radius: 12px; padding: 1rem; position: relative; }
.timeline-body::before {
  content: ''; position: absolute; left: -6px; top: 18px; width: 12px; height: 12px;
  background: var(--accent2); border-radius: 50%;
}
.timeline-body h5 { font-size: 1rem; margin-bottom: 0.25rem; }
.timeline-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; }
.deep-proofs-grid, .deep-apps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.deep-proof-card, .deep-app-card {
  background: rgba(0,0,0,0.2); border-radius: 16px; padding: 1.25rem; border: 1px solid rgba(255,255,255,0.08);
}
.deep-proof-card.highlight { border-color: var(--accent); background: rgba(245,158,11,0.08); }
.deep-proof-card h5, .deep-app-card h5 { font-size: 1rem; margin-bottom: 0.5rem; }
.deep-proof-card p, .deep-app-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; }
.app-icon { font-size: 2rem; margin-bottom: 0.5rem; }

.mastery-panel { background: var(--bg-secondary); border-radius: 16px; padding: 1.5rem; }
.mastery-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
.mastery-title { font-size: 1rem; color: var(--text-secondary); }
.mastery-level { font-size: 0.85rem; padding: 0.35rem 0.75rem; border-radius: 20px; font-weight: 600; }
.mastery-level.beginner { background: rgba(239, 68, 68, 0.15); color: #fca5a5; }
.mastery-level.learning { background: rgba(245, 158, 11, 0.15); color: #fcd34d; }
.mastery-level.proficient { background: rgba(59, 130, 246, 0.15); color: #93c5fd; }
.mastery-level.mastered { background: rgba(16, 185, 129, 0.15); color: #6ee7b7; }
.mastery-bar { height: 12px; background: rgba(255,255,255,0.1); border-radius: 6px; overflow: hidden; margin-bottom: 1rem; }
.mastery-fill { height: 100%; background: linear-gradient(90deg, var(--accent2), var(--accent3)); border-radius: 6px; transition: width 0.5s ease; }
.mastery-stats { display: flex; gap: 1rem; font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 1.5rem; flex-wrap: wrap; }
.skill-list { display: grid; gap: 0.75rem; }
.skill-item { display: flex; align-items: center; gap: 0.75rem; background: rgba(0,0,0,0.2); border-radius: 12px; padding: 0.75rem 1rem; }
.skill-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.skill-icon.concept { background: rgba(59, 130, 246, 0.15); }
.skill-icon.calculation { background: rgba(245, 158, 11, 0.15); }
.skill-icon.application { background: rgba(16, 185, 129, 0.15); }
.skill-icon.proof { background: rgba(139, 92, 246, 0.15); }
.skill-info { flex: 1; }
.skill-name { font-weight: 600; font-size: 0.95rem; }
.skill-desc { font-size: 0.8rem; color: var(--text-secondary); }
.skill-mastery { text-align: right; }
.skill-percent { font-size: 1.1rem; font-weight: 700; color: var(--accent2); }
.skill-label { font-size: 0.75rem; color: var(--text-secondary); }

.learning-path { position: relative; display: flex; flex-direction: column; gap: 1rem; padding-left: 1.5rem; }
.path-line { position: absolute; left: 11px; top: 8px; bottom: 8px; width: 3px; background: rgba(255,255,255,0.1); }
.path-node { background: var(--bg-secondary); border-radius: 12px; padding: 1rem; position: relative; }
.path-node::before {
  content: ''; position: absolute; left: -19px; top: 18px; width: 14px; height: 14px;
  border-radius: 50%; background: rgba(255,255,255,0.2); border: 2px solid var(--bg-card);
}
.path-node.completed::before { background: var(--success); }
.path-node.current::before { background: var(--accent); }
.path-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.25rem; flex-wrap: wrap; gap: 0.5rem; }
.path-title { font-weight: 600; }
.path-status { font-size: 0.75rem; padding: 0.2rem 0.6rem; border-radius: 20px; }
.path-status.completed { background: rgba(16, 185, 129, 0.15); color: #6ee7b7; }
.path-status.current { background: rgba(245, 158, 11, 0.15); color: #fcd34d; }
.path-status.locked { background: rgba(255,255,255,0.1); color: var(--text-secondary); }
.path-desc { font-size: 0.85rem; color: var(--text-secondary); }

.socratic-container { background: var(--bg-secondary); border-radius: 16px; padding: 1rem; max-height: 520px; overflow-y: auto; }
.depth-meter { display: flex; align-items: center; justify-content: center; gap: 0.25rem; margin-bottom: 1rem; flex-wrap: wrap; }
.depth-dot {
  width: 32px; height: 32px; border-radius: 50%; background: rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 700;
  position: relative; color: var(--text-secondary);
}
.depth-dot.active { background: var(--accent2); color: white; }
.depth-dot.done { background: var(--success); color: white; }
.depth-label { position: absolute; bottom: -20px; font-size: 0.65rem; white-space: nowrap; font-weight: 500; }
.depth-connector { width: 24px; height: 3px; background: rgba(255,255,255,0.1); }
.depth-connector.done { background: var(--success); }
.socrates-chat { display: flex; flex-direction: column; gap: 0.75rem; }
.chat-bubble { display: flex; gap: 0.75rem; align-items: flex-start; animation: fadeIn 0.3s ease; }
.chat-bubble.teacher { flex-direction: row; }
.chat-bubble.student { flex-direction: row-reverse; }
.chat-bubble.system { justify-content: center; }
.chat-avatar { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.chat-content {
  background: rgba(255,255,255,0.08); border-radius: 12px; padding: 0.75rem 1rem;
  max-width: 80%; font-size: 0.95rem; line-height: 1.5;
}
.chat-bubble.student .chat-content { background: var(--accent2); color: white; }
.chat-bubble.system .chat-content { background: rgba(16, 185, 129, 0.15); border: 1px solid var(--success); color: #6ee7b7; max-width: 90%; }
.typing-indicator { display: flex; gap: 4px; padding: 0.25rem 0; }
.typing-dot { width: 8px; height: 8px; background: rgba(255,255,255,0.5); border-radius: 50%; animation: typingBounce 1s infinite; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce { 0%, 80%, 100% { transform: translateY(0); } 40% { transform: translateY(-6px); } }
.socrates-options { display: grid; gap: 0.5rem; margin-top: 0.5rem; }
.socrates-opt-btn {
  background: rgba(255,255,255,0.05); border: 2px solid rgba(255,255,255,0.1); border-radius: 10px;
  padding: 0.75rem 1rem; color: var(--text-primary); cursor: pointer; text-align: left;
  font-size: 0.95rem; transition: all 0.2s; display: flex; align-items: center; gap: 0.5rem;
}
.socrates-opt-btn:hover { border-color: var(--accent2); background: rgba(59, 130, 246, 0.1); }
.socrates-opt-btn.selected { border-color: var(--accent2); background: rgba(59, 130, 246, 0.2); }
.socrates-opt-btn.correct { border-color: var(--success); background: rgba(16, 185, 129, 0.2); }
.socrates-opt-btn:disabled { cursor: default; opacity: 0.9; }
.opt-letter { width: 24px; height: 24px; border-radius: 50%; background: rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; }
.socrates-actions { display: flex; gap: 0.5rem; margin-top: 0.5rem; flex-wrap: wrap; }
.socrates-action-btn {
  background: rgba(255,255,255,0.08); border: none; color: var(--text-secondary);
  padding: 0.5rem 0.75rem; border-radius: 8px; cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.socrates-action-btn:hover { background: rgba(255,255,255,0.15); color: var(--text-primary); }
.socrates-hint { background: rgba(245, 158, 11, 0.1); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; padding: 0.6rem 1rem; font-size: 0.9rem; color: #fcd34d; margin-top: 0.25rem; }
.socrates-explain { margin-top: 0.5rem; padding-top: 0.5rem; border-top: 1px solid rgba(255,255,255,0.1); color: rgba(255,255,255,0.85); font-size: 0.9rem; }
.socrates-revelation {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(59, 130, 246, 0.3); border-radius: 16px; padding: 1.25rem; text-align: center;
}
.socrates-revelation h4 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.socratic-score { font-size: 1rem; margin-bottom: 0.75rem; color: var(--text-secondary); }
.socratic-badge { background: var(--accent); color: white; padding: 0.2rem 0.6rem; border-radius: 20px; font-size: 0.85rem; margin-left: 0.5rem; }
.revelation-steps { display: grid; gap: 0.5rem; text-align: left; margin: 1rem 0; }
.rev-step { background: rgba(0,0,0,0.2); border-radius: 8px; padding: 0.6rem 0.75rem; font-size: 0.9rem; }
.rev-num { color: var(--accent2); font-weight: 700; margin-right: 0.5rem; }
.socrates-reset-btn {
  background: linear-gradient(135deg, var(--accent2), var(--accent4)); color: white; border: none;
  padding: 0.75rem 1.25rem; border-radius: 10px; cursor: pointer; font-size: 0.95rem; margin-top: 1rem;
}

.tooltip { position: fixed; background: rgba(0,0,0,0.85); color: white; padding: 0.5rem 0.75rem; border-radius: 8px; font-size: 0.8rem; pointer-events: none; opacity: 0; transition: opacity 0.2s; z-index: 1000; }

@media (max-width: 768px) {
  .lab-header { flex-direction: column; gap: 0.75rem; align-items: flex-start; }
  .module-tabs { overflow-x: auto; flex-wrap: nowrap; }
  .proof-workspace { grid-template-columns: 1fr; }
  .formula-display { font-size: 1.1rem; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}