/* ============================================================
   Question Detail Page Styles

   Refactored for:
   - Consistent use of CSS custom properties
   - Reduced redundancy in pseudo-element styles
   - Removed dead/duplicate code
   ============================================================ */

.question-detail-page {
  display: none;
}

.question-detail-page.active {
  display: block;
}

/* ============================================================
   Loading State
   ============================================================ */
.question-detail-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-5);
  color: var(--color-text-muted);
}

.question-detail-loading .loading-spinner {
  width: var(--space-10);
  height: var(--space-10);
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--space-4);
}

.question-detail-loading p {
  font-size: var(--text-base);
  margin: 0;
}

/* ============================================================
   Header and Title
   ============================================================ */
.detail-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.detail-question-title {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-text-main);
  text-align: center;
  margin-bottom: var(--space-5);
}

/* ============================================================
   Question Meta Row (badges + header practice button)
   ============================================================ */
.question-meta-row {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-6);
}

/* ============================================================
   Question Meta Badges (inline badges below title)
   ============================================================ */
.question-meta-badges {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Header Practice Button (positioned right, visible on desktop only) */
.practice-btn-header {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: var(--space-2-5) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.practice-btn-header:hover:not(:disabled) {
  transform: translateY(-50%);
  filter: brightness(1.1);
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1-5) var(--space-4);
  border-radius: var(--radius-2xl);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: capitalize;
}

.meta-badge.category {
  background: var(--color-info-bg);
  color: var(--color-info-text);
}

/* Default difficulty style (medium) - easy/hard override below */
.meta-badge.difficulty {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.meta-badge.difficulty.easy {
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

/* Note: .meta-badge.difficulty.medium removed - uses default .difficulty styles */

.meta-badge.difficulty.hard {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}

.meta-badge.structure {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

/* ============================================================
   Question Guidance Tabs
   ============================================================ */
.question-guidance-container {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-6);
  overflow: hidden;
}

.guidance-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-muted);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.guidance-tab {
  flex: 1;
  min-width: fit-content;
  padding: var(--space-4) var(--space-6);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-base, 0.2s ease);
  white-space: nowrap;
}

.guidance-tab:hover {
  color: var(--color-text);
  background: var(--color-bg-hover);
}

.guidance-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-bg);
}

/* Tab Content */
.guidance-tab-content {
  padding: var(--space-5);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.overview-text {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ============================================================
   Consolidated Overview Sections (Phase 1: Tab Consolidation)
   ============================================================ */
.overview-section {
  margin-bottom: var(--space-5);
}

.overview-section:last-child {
  margin-bottom: 0;
}

.overview-section-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-2-5) 0;
}

/* ============================================================
   Competencies List
   ============================================================ */
.competencies-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ============================================================
   Tips & Pitfalls Side-by-Side Grid
   ============================================================ */
.tips-pitfalls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  background: var(--color-bg-muted);
  border-radius: var(--radius);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
}

.tips-column {
  padding: 0;
}

.tips-column-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  margin: 0 0 var(--space-2-5) 0;
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.tips-column-title.tips-title {
  color: var(--color-success);
}

.tips-column-title.pitfalls-title {
  color: var(--color-warning);
}

.tips-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-5);
  height: var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
}

.tips-title .tips-icon {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.pitfalls-title .tips-icon {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.tips-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tips-list li {
  display: flex;
  align-items: center;
  gap: var(--space-1-5);
  margin-bottom: var(--space-1-5);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-text-secondary);
}

.tips-list li:last-child {
  margin-bottom: 0;
}

.tips-list li::before {
  content: "✓";
  flex-shrink: 0;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-success);
  line-height: 1.4;
}

.tips-list.pitfalls li::before {
  content: "✗";
  color: var(--color-warning);
}

/* ============================================================
   Mobile Responsive
   ============================================================ */
@media (max-width: 768px) {
  .detail-header {
    margin-bottom: var(--space-5);
  }

  .detail-question-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
    line-height: 1.3;
  }

  .question-meta-row {
    margin-bottom: var(--space-5);
  }

  .question-meta-badges {
    gap: var(--space-2);
  }

  /* Hide header practice button on mobile - use fixed bottom button instead */
  .practice-btn-header {
    display: none;
  }

  .meta-badge {
    padding: 5px var(--space-3);
    font-size: var(--text-xs);
  }

  .question-guidance-container {
    margin-bottom: var(--space-5);
  }

  .guidance-tabs {
    gap: 0;
  }

  .guidance-tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  .guidance-tab-content {
    padding: var(--space-5) var(--space-4);
  }

  .overview-text {
    font-size: var(--text-base);
    line-height: 1.7;
  }

  .overview-section {
    margin-bottom: var(--space-6);
  }

  .overview-section-title {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
  }

  /* Tips & Pitfalls Grid - stack on tablet */
  .tips-pitfalls-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
    padding: var(--space-4);
  }

  .tips-column-title {
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2-5);
  }

  .tips-list li {
    font-size: var(--text-xs);
    gap: var(--space-1-5);
    margin-bottom: var(--space-1-5);
  }
}

@media (max-width: 480px) {
  .guidance-tab {
    padding: var(--space-2-5) var(--space-3);
    font-size: var(--text-xs);
  }

  .guidance-tab-content {
    padding: var(--space-4) var(--space-3);
  }

  .overview-section {
    margin-bottom: var(--space-5);
  }

  .overview-section-title {
    font-size: var(--text-base);
    margin-bottom: var(--space-2-5);
  }

  .competencies-list {
    gap: var(--space-2);
  }
}

/* ============================================================
   Fixed Practice Button (Phase 2: Issue #238)
   ============================================================ */
.practice-button-fixed {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg);
  padding: var(--space-4);
  padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  z-index: var(--z-dropdown);
  display: flex;
  justify-content: center;
}

.practice-button-fixed .btn-large {
  width: 100%;
  max-width: 400px;
  min-height: 48px;
  font-size: var(--text-lg);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
}

/* Add bottom padding to content to prevent overlap with fixed button */
#questionDetailContent {
  padding-bottom: 100px;
}

@media (min-width: 768px) {
  .practice-button-fixed {
    padding: var(--space-5) var(--space-8);
    /* Account for sidebar on desktop */
    left: var(--sidebar-width);
  }

  .practice-button-fixed .btn-large {
    max-width: 320px;
  }
}

/* Hide fixed button when sidebar is collapsed (mobile) */
@media (max-width: 768px) {
  .practice-button-fixed {
    left: 0;
  }
}