/**
 * Section Numbering & Table of Contents System
 * IMAGES NOT WORDS, SIMPLE IS BETTER
 * Visual navigation through sequential numbering and hierarchical TOC
 */

/* ============================================
   SECTION NUMBER BADGE
   ============================================ */

.section-number-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 28px;
  padding: 0 10px;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  margin-right: 12px;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.15);
}

.section-number-badge::before {
  content: '#';
  font-size: 11px;
  opacity: 0.8;
  margin-right: 2px;
}

.section-number-badge:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.25);
  transform: translateY(-1px);
}

.section-number-badge:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

/* Copy link tooltip (appears on hover) */
.section-number-badge::after {
  content: '🔗 Copy Link';
  position: absolute;
  top: -32px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #ffffff;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.section-number-badge:hover::after {
  opacity: 1;
}

/* Clickable state feedback */
.section-number-badge.copied {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
}

.section-number-badge.copied::after {
  content: '✓ Copied!';
  opacity: 1;
}

/* ============================================
   TABLE OF CONTENTS TOGGLE BUTTON
   ============================================ */

.toc-toggle-button {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  width: 48px;
  height: 48px;
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.toc-toggle-button:hover {
  background: #f9fafb;
  border-color: #2563eb;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.15);
}

.toc-toggle-button i {
  font-size: 20px;
  color: #2563eb;
  transition: transform 0.2s ease;
}

.toc-toggle-button.active i {
  transform: rotate(90deg);
}

/* Badge showing total sections */
.toc-toggle-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: #ef4444;
  color: #ffffff;
  font-size: 10px;
  font-weight: 700;
  min-width: 20px;
  height: 20px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* ============================================
   TABLE OF CONTENTS CONTAINER
   ============================================ */

.document-toc {
  position: fixed;
  top: 0;
  left: 0;
  width: 340px;
  /* FIXED: Use max-height instead of fixed height to allow natural scrolling */
  max-height: 100vh;
  background: #ffffff;
  border-right: 1px solid #e5e7eb;
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 4px 0 12px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  /* FIXED: Changed to auto to allow internal scrolling */
  overflow-y: auto;
  overflow-x: hidden;
}

.document-toc.open {
  transform: translateX(0);
}

/* Backdrop overlay */
.toc-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.3);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(2px);
  /* FIXED: Allow scrolling through backdrop on desktop */
  overflow-y: auto;
}

.toc-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ============================================
   TOC HEADER
   ============================================ */

.toc-header {
  padding: 20px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.toc-header h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-header h3 i {
  font-size: 20px;
  opacity: 0.9;
}

.toc-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  opacity: 0.9;
}

.toc-section-count {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toc-collapse-all {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ffffff;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toc-collapse-all:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   TOC SEARCH
   ============================================ */

.toc-search {
  padding: 16px 20px;
  background: #f9fafb;
  border-bottom: 1px solid #e5e7eb;
  flex-shrink: 0;
}

.toc-search-input {
  width: 100%;
  padding: 10px 38px 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
  transition: all 0.2s ease;
  background: #ffffff;
}

.toc-search-input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.toc-search-icon {
  position: absolute;
  right: 32px;
  top: 26px;
  color: #9ca3af;
  pointer-events: none;
  font-size: 14px;
}

/* ============================================
   TOC CONTENT SCROLLABLE AREA
   ============================================ */

.toc-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px 0;
}

/* Smooth scrolling */
.toc-content {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
.toc-content::-webkit-scrollbar {
  width: 8px;
}

.toc-content::-webkit-scrollbar-track {
  background: #f9fafb;
}

.toc-content::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 4px;
}

.toc-content::-webkit-scrollbar-thumb:hover {
  background: #9ca3af;
}

/* ============================================
   TOC ITEMS
   ============================================ */

.toc-item {
  position: relative;
  padding: 10px 20px;
  cursor: pointer;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  user-select: none;
}

.toc-item:hover {
  background: #f3f4f6;
  border-left-color: #2563eb;
}

.toc-item.active {
  background: #fef3c7;
  border-left-color: #fbbf24;
}

/* Depth indicator dots (visual hierarchy) */
.toc-item::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 5px;
  transition: transform 0.2s ease;
}

.toc-item:hover::before {
  transform: scale(1.3);
}

/* Depth color coding (matches section depth colors) */
.toc-item.depth-0::before { background: #1e40af; }
.toc-item.depth-1::before { background: #0891b2; }
.toc-item.depth-2::before { background: #059669; }
.toc-item.depth-3::before { background: #16a34a; }
.toc-item.depth-4::before { background: #d97706; }
.toc-item.depth-5::before { background: #ea580c; }
.toc-item.depth-6::before { background: #9333ea; }
.toc-item.depth-7::before { background: #c026d3; }
.toc-item.depth-8::before { background: #64748b; }
.toc-item.depth-9::before { background: #94a3b8; border: 2px solid #475569; }

/* Depth indentation (15px per level, matching document) */
.toc-item.depth-0 { padding-left: 20px; }
.toc-item.depth-1 { padding-left: 35px; }
.toc-item.depth-2 { padding-left: 50px; }
.toc-item.depth-3 { padding-left: 65px; }
.toc-item.depth-4 { padding-left: 80px; }
.toc-item.depth-5 { padding-left: 95px; }
.toc-item.depth-6 { padding-left: 110px; }
.toc-item.depth-7 { padding-left: 125px; }
.toc-item.depth-8 { padding-left: 140px; }
.toc-item.depth-9 { padding-left: 155px; }

/* TOC Item Content */
.toc-item-content {
  flex: 1;
  min-width: 0;
}

.toc-item-number {
  display: inline-block;
  font-weight: 700;
  color: #2563eb;
  font-size: 12px;
  margin-right: 6px;
  font-family: 'Courier New', monospace;
}

.toc-item-citation {
  font-size: 13px;
  color: #1e293b;
  font-weight: 500;
  line-height: 1.4;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-item:hover .toc-item-citation {
  color: #2563eb;
}

/* Metadata badges */
.toc-item-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  font-size: 11px;
}

.toc-meta-badge {
  background: #e0e7ff;
  color: #3730a3;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.toc-meta-badge.suggestions {
  background: #fef3c7;
  color: #92400e;
}

.toc-meta-badge.locked {
  background: #dbeafe;
  color: #1e40af;
}

.toc-meta-badge.approved {
  background: #d1fae5;
  color: #065f46;
}

/* Hidden class for filtering */
.toc-item.hidden {
  display: none;
}

/* ============================================
   DEPTH LEVEL SUMMARY
   ============================================ */

.toc-depth-summary {
  padding: 16px 20px;
  background: #f9fafb;
  border-top: 1px solid #e5e7eb;
  flex-shrink: 0;
}

.toc-depth-summary-title {
  font-size: 12px;
  font-weight: 700;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.toc-depth-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.toc-depth-chip {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  cursor: pointer;
  transition: all 0.15s ease;
}

.toc-depth-chip:hover {
  border-color: #2563eb;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.1);
}

.toc-depth-chip::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Depth chip colors */
.toc-depth-chip.depth-0::before { background: #1e40af; }
.toc-depth-chip.depth-1::before { background: #0891b2; }
.toc-depth-chip.depth-2::before { background: #059669; }
.toc-depth-chip.depth-3::before { background: #16a34a; }
.toc-depth-chip.depth-4::before { background: #d97706; }
.toc-depth-chip.depth-5::before { background: #ea580c; }
.toc-depth-chip.depth-6::before { background: #9333ea; }
.toc-depth-chip.depth-7::before { background: #c026d3; }
.toc-depth-chip.depth-8::before { background: #64748b; }
.toc-depth-chip.depth-9::before { background: #94a3b8; }

/* ============================================
   MOBILE RESPONSIVE (BOTTOM SHEET)
   ============================================ */

@media (max-width: 768px) {
  .document-toc {
    top: auto;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: 60vh;
    max-height: 500px;
    border-right: none;
    border-top: 1px solid #e5e7eb;
    border-radius: 20px 20px 0 0;
    transform: translateY(100%);
  }

  .document-toc.open {
    transform: translateY(0);
  }

  .toc-toggle-button {
    top: auto;
    bottom: 20px;
    left: 20px;
  }

  /* Handle bar for dragging */
  .toc-handle {
    width: 40px;
    height: 4px;
    background: #d1d5db;
    border-radius: 2px;
    margin: 8px auto;
    cursor: grab;
  }

  /* Reduce indentation for mobile */
  .toc-item.depth-0 { padding-left: 16px; }
  .toc-item.depth-1 { padding-left: 26px; }
  .toc-item.depth-2 { padding-left: 36px; }
  .toc-item.depth-3 { padding-left: 46px; }
  .toc-item.depth-4 { padding-left: 56px; }
  .toc-item.depth-5 { padding-left: 66px; }
  .toc-item.depth-6 { padding-left: 76px; }
  .toc-item.depth-7 { padding-left: 86px; }
  .toc-item.depth-8 { padding-left: 96px; }
  .toc-item.depth-9 { padding-left: 106px; }

  /* Touch-friendly sizing */
  .toc-item {
    padding-top: 12px;
    padding-bottom: 12px;
  }
}

/* ============================================
   TABLET RESPONSIVE
   ============================================ */

@media (min-width: 769px) and (max-width: 1024px) {
  .document-toc {
    width: 300px;
  }

  .toc-toggle-button {
    width: 44px;
    height: 44px;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .toc-toggle-button,
  .toc-backdrop {
    display: none !important;
  }

  .document-toc {
    position: relative;
    transform: translateX(0) !important;
    width: 100%;
    height: auto;
    max-height: none;
    border: 1px solid #000;
    margin-bottom: 20px;
    page-break-inside: avoid;
  }

  .toc-header {
    background: #f9fafb !important;
    color: #000 !important;
    border-bottom: 2px solid #000;
  }

  .toc-item::before {
    filter: grayscale(100%);
  }

  .toc-search {
    display: none;
  }
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Keyboard focus */
.toc-item:focus-visible {
  outline: 3px solid #3b82f6;
  outline-offset: -3px;
  background: #dbeafe;
}

.toc-toggle-button:focus-visible {
  outline: 3px solid #3b82f6;
  outline-offset: 2px;
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Skip to content link */
.skip-to-content {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 10000;
  background: #2563eb;
  color: #ffffff;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-to-content:focus {
  top: 20px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .toc-item {
    border: 1px solid currentColor;
  }

  .toc-item::before {
    border: 2px solid currentColor;
  }

  .section-number-badge {
    border: 2px solid currentColor;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .document-toc,
  .toc-backdrop,
  .toc-item,
  .section-number-badge,
  .toc-toggle-button {
    transition: none;
  }

  .toc-content {
    scroll-behavior: auto;
  }
}

/* ============================================
   DARK MODE SUPPORT
   ============================================ */

@media (prefers-color-scheme: dark) {
  .document-toc {
    background: #1e293b;
    border-right-color: #334155;
  }

  .toc-toggle-button {
    background: #1e293b;
    border-color: #334155;
  }

  .toc-toggle-button:hover {
    background: #334155;
    border-color: #2563eb;
  }

  .toc-search {
    background: #0f172a;
    border-bottom-color: #334155;
  }

  .toc-search-input {
    background: #1e293b;
    border-color: #334155;
    color: #f1f5f9;
  }

  .toc-content::-webkit-scrollbar-track {
    background: #0f172a;
  }

  .toc-item {
    color: #f1f5f9;
  }

  .toc-item:hover {
    background: #334155;
  }

  .toc-item.active {
    background: #422006;
  }

  .toc-item-citation {
    color: #e2e8f0;
  }

  .toc-item:hover .toc-item-citation {
    color: #60a5fa;
  }

  .toc-depth-summary {
    background: #0f172a;
    border-top-color: #334155;
  }

  .toc-depth-chip {
    background: #1e293b;
    border-color: #334155;
    color: #e2e8f0;
  }
}

/* ============================================
   APP THEME TOGGLE DARK MODE SUPPORT
   (for [data-theme="dark"] attribute)
   ============================================ */

[data-theme="dark"] .document-toc {
  background: #1e293b;
  border-right-color: #334155;
}

[data-theme="dark"] .toc-toggle-button {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .toc-toggle-button:hover {
  background: #334155;
  border-color: #2563eb;
}

[data-theme="dark"] .toc-search {
  background: #0f172a;
  border-bottom-color: #334155;
}

[data-theme="dark"] .toc-search-input {
  background: #1e293b;
  border-color: #334155;
  color: #f1f5f9;
}

[data-theme="dark"] .toc-content::-webkit-scrollbar-track {
  background: #0f172a;
}

[data-theme="dark"] .toc-item {
  color: #f1f5f9;
}

[data-theme="dark"] .toc-item:hover {
  background: #334155;
}

[data-theme="dark"] .toc-item.active {
  background: #422006;
}

[data-theme="dark"] .toc-item-citation {
  color: #e2e8f0;
}

[data-theme="dark"] .toc-item:hover .toc-item-citation {
  color: #60a5fa;
}

[data-theme="dark"] .toc-depth-summary {
  background: #0f172a;
  border-top-color: #334155;
}

[data-theme="dark"] .toc-depth-chip {
  background: #1e293b;
  border-color: #334155;
  color: #e2e8f0;
}