/* ============================================
   Learning Page Styles
   ============================================ */

.learning-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-8) var(--spacing-6) 60px;
}

/* Header */
.learning-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-8);
  gap: 20px;
  flex-wrap: wrap;
}
.learning-header .section-title {
  margin: 0;
  font-size: 28px;
}

.learning-stats {
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
  flex-wrap: wrap;
}
.learn-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-3) 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  min-width: 90px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.learn-stat:hover {
  border-color: var(--text-tertiary);
  box-shadow: var(--shadow-sm);
}
.learn-stat-value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--gold);
  text-shadow: 0 0 12px var(--gold-glow);
}
.learn-stat-label {
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Tab Bar */
.learn-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--bg-tertiary);
  margin-bottom: var(--spacing-8);
}
.learn-tab {
  padding: var(--spacing-3) 32px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-tertiary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.learn-tab:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.02);
}
.learn-tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--gold);
}

/* Course Layout */
.learn-course-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 28px;
}
.learn-sidebar {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: var(--spacing-4) 0;
  max-height: 80vh;
  overflow-y: auto;
}

/* Tier in sidebar */
.learn-tier {
  border-bottom: 1px solid var(--border-color);
}
.learn-tier:last-child {
  border-bottom: none;
}
.learn-tier-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  user-select: none;
  transition: background var(--transition-fast);
}
.learn-tier-header:hover {
  background: var(--bg-tertiary);
}
.learn-tier-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}
.learn-tier:nth-child(1) .learn-tier-icon { background: rgba(76,175,80,0.15); color: #4caf50; }
.learn-tier:nth-child(2) .learn-tier-icon { background: rgba(33,150,243,0.15); color: #2196f3; }
.learn-tier:nth-child(3) .learn-tier-icon { background: rgba(255,152,0,0.15); color: #ff9800; }
.learn-tier:nth-child(4) .learn-tier-icon { background: rgba(156,39,176,0.15); color: #9c27b0; }

.learn-tier-lock {
  color: var(--text-tertiary);
  font-size: 12px;
  margin-left: auto;
}
.learn-tier-progress-bar {
  width: 48px;
  height: 5px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  margin-left: auto;
  overflow: hidden;
}
.learn-tier-progress-fill {
  height: 100%;
  background: var(--gold);
  border-radius: 3px;
  transition: width 0.5s ease;
}
.learn-tier-lessons {
  display: none;
}
.learn-tier.expanded .learn-tier-lessons {
  display: block;
}
.learn-tier.locked .learn-tier-header {
  color: var(--text-tertiary);
  cursor: default;
  opacity: 0.6;
}

/* Lesson item */
.learn-lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px 10px 54px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
}
.learn-lesson-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.learn-lesson-item.active {
  color: var(--gold);
  background: var(--gold-dim);
}
.learn-lesson-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--gold);
}
.learn-lesson-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 11px;
  color: transparent;
  transition: all var(--transition-fast);
}
.learn-lesson-item.completed .learn-lesson-check {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
  box-shadow: 0 0 6px var(--green-glow);
}

/* Lesson Content */
.learn-content {
  min-height: 500px;
}
.learn-lesson-view {
  animation: learnFadeIn 0.25s ease-out;
}
@keyframes learnFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.learn-lesson-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 20px;
  color: var(--text-primary);
}
.learn-lesson-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-6);
}
.learn-lesson-body p {
  margin: 0 0 14px;
}
.learn-lesson-body strong {
  color: var(--text-primary);
}
.learn-lesson-body ul {
  margin: 10px 0;
  padding-left: var(--spacing-6);
}
.learn-lesson-body li {
  margin-bottom: 6px;
  font-size: 15px;
  line-height: 1.7;
}

/* Takeaways */
.learn-takeaways {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--gold);
  padding: 20px;
  margin-bottom: var(--spacing-6);
}
.learn-takeaways h4 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gold);
  margin: 0 0 10px;
}
.learn-takeaways ul {
  margin: 0;
  padding-left: 20px;
}
.learn-takeaways li {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.6;
}

/* Chart example area */
.learn-chart-example {
  background: #000;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  height: 280px;
  margin-bottom: var(--spacing-6);
}

/* Lesson actions */
.learn-lesson-actions {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-top: 28px;
}

/* Challenge Tab */
.learn-challenge-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 28px;
}
.learn-quiz-chart {
  background: #000;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  height: 400px;
}
.learn-quiz-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.learn-quiz-question {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}
.learn-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.learn-quiz-option {
  padding: 14px 18px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 15px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.learn-quiz-option:hover {
  border-color: var(--gold);
  color: var(--text-primary);
  background: var(--bg-surface-hover);
}
.learn-quiz-option.selected {
  border-color: var(--gold);
  background: var(--gold-dim);
  color: var(--text-primary);
  box-shadow: 0 0 12px var(--gold-glow);
}
.learn-quiz-option.correct {
  border-color: var(--green);
  background: rgba(14, 203, 129, 0.1);
  color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}
.learn-quiz-option.wrong {
  border-color: var(--red);
  background: rgba(246, 70, 93, 0.1);
  color: var(--red);
  box-shadow: 0 0 12px var(--red-glow);
}
.learn-quiz-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  resize: vertical;
  min-height: 100px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.learn-quiz-input:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-dim);
}
.learn-quiz-actions {
  display: flex;
  gap: var(--spacing-3);
}

/* AI Result */
.learn-quiz-result {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  animation: learnFadeIn 0.3s ease-out;
}
.learn-quiz-result.correct-result {
  border-color: var(--green);
  background: linear-gradient(135deg, var(--bg-secondary), rgba(14, 203, 129, 0.05));
}
.learn-quiz-result.wrong-result {
  border-color: var(--red);
  background: linear-gradient(135deg, var(--bg-secondary), rgba(246, 70, 93, 0.05));
}

/* Practice Scenarios */
.learn-scenarios {
  margin-top: var(--spacing-8);
}
.learn-scenarios h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-4);
}
.learn-scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.learn-scenario-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.learn-scenario-card:hover {
  border-color: var(--gold);
  background: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.learn-scenario-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text-primary);
}
.learn-scenario-card p {
  font-size: 13px;
  color: var(--text-tertiary);
  margin: 0;
  line-height: 1.5;
}

/* Weakness Cards */
.learn-weakness-section {
  margin-top: var(--spacing-8);
}
.learn-weakness-section h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-4);
}
.learn-weakness-cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}
.learn-weakness-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-4) 18px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: border-color var(--transition-fast);
}
.learn-weakness-card:hover {
  border-color: var(--text-tertiary);
}
.learn-weakness-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.learn-weakness-icon.warn {
  background: rgba(255, 152, 0, 0.15);
  color: #ff9800;
}
.learn-weakness-icon.info {
  background: var(--gold-dim);
  color: var(--gold);
}
.learn-weakness-text h4 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--text-primary);
}
.learn-weakness-text p {
  font-size: 13px;
  color: var(--text-tertiary);
  margin: 0;
  line-height: 1.5;
}

/* Empty state */
.learn-empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-tertiary);
}
.learn-empty-icon {
  font-size: 56px;
  margin-bottom: 20px;
  opacity: 0.4;
}

/* Badge */
.learn-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--gold-dim);
  border: 1px solid var(--gold);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .learning-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .learning-container {
    padding: 20px var(--spacing-3) 40px;
  }
  .learn-course-layout {
    grid-template-columns: 1fr;
  }
  .learn-sidebar {
    max-height: none;
  }
  .learn-tier-lessons {
    display: none;
  }
  .learn-tier.expanded .learn-tier-lessons {
    display: block;
  }
  .learn-challenge-layout {
    grid-template-columns: 1fr;
  }
  .learn-quiz-chart {
    height: 260px;
  }
  .learn-scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .learn-tab {
    padding: 10px 20px;
    font-size: 14px;
  }
  .learn-lesson-title {
    font-size: 20px;
  }
  .learn-lesson-body {
    font-size: 14px;
  }
}