/* Reset & Base Variables */
:root {
  --bg-main: #0b0f17;
  --bg-sidebar: #0f1523;
  --bg-card: #151d30;
  --bg-hover: #1c2742;
  --border-color: #232f48;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --text-bright: #ffffff;
  
  --accent-cyan: #00f0ff;
  --accent-blue: #38bdf8;
  --accent-emerald: #10b981;
  --accent-purple: #a855f7;
  --accent-amber: #f59e0b;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Lora', Georgia, Cambria, serif;
  --font-mono: 'JetBrains Mono', monospace;

  --sidebar-width: 340px;
  --header-height: 64px;
}

body.theme-light {
  --bg-main: #ffffff;
  --bg-sidebar: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  --border-color: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-bright: #0f172a;

  --accent-cyan: #0284c7;
  --accent-blue: #2563eb;
  --accent-emerald: #059669;
  --accent-purple: #7c3aed;
  --accent-amber: #d97706;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

/* App Layout */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Top Header */
.top-header {
  height: var(--header-height);
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.05);
}

.brand {
  display: flex;
  flex-direction: column;
}

.brand-badge {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  text-transform: uppercase;
}

.brand-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-bright);
  white-space: nowrap;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Search Bar */
.header-center {
  flex: 1;
  max-width: 680px;
  position: relative;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 8px 16px;
  gap: 10px;
  transition: all 0.2s;
}

.search-box:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
}

.search-box input {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 13.5px;
  width: 100%;
  outline: none;
}

.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.5);
  max-height: 380px;
  overflow-y: auto;
  z-index: 200;
  padding: 8px;
}

.search-dropdown.hidden {
  display: none;
}

.search-result-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.search-result-item:hover {
  background: var(--bg-hover);
}

.search-result-item .res-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.search-result-item .res-snippet {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Header Right Controls */
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reader-controls {
  display: flex;
  gap: 8px;
}

/* Main Body Layout */
.main-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  flex-shrink: 0;
}

.sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-section {
  display: flex;
  flex-direction: column;
}

.sidebar-section.portals-section {
  border-bottom: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.02);
}

.sidebar-section.toc-section {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-section-header,
.sidebar-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-main);
}

.sidebar-title {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.sidebar-stats {
  font-size: 10px;
  color: var(--accent-blue);
  font-weight: 700;
  background: rgba(0, 102, 255, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
}

/* Sidebar Navigation Tabs (Moved from Header) */
.sidebar-nav-tabs {
  display: flex;
  flex-direction: column;
  padding: 8px 10px;
  gap: 3px;
  max-height: 240px;
  overflow-y: auto;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
  text-align: left;
  width: 100%;
}

.nav-tab .tab-icon {
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  flex-shrink: 0;
}

.nav-tab .tab-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-tab:hover {
  background: var(--bg-hover);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
  background: var(--bg-card);
  color: var(--accent-cyan);
  border-color: rgba(0, 240, 255, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  font-weight: 700;
}

.chapters-nav {
  overflow-y: auto;
  flex: 1;
  padding: 10px;
}

.part-group {
  margin-bottom: 16px;
}

.part-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.chapter-nav-item {
  display: flex;
  align-items: flex-start;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: all 0.2s;
  text-decoration: none;
  color: var(--text-main);
  gap: 10px;
}

.chapter-nav-item:hover {
  background: var(--bg-hover);
}

.chapter-nav-item.active {
  background: var(--bg-card);
  border-left: 3px solid var(--accent-cyan);
  color: var(--accent-cyan);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.chapter-info {
  flex: 1;
}

.chapter-item-title {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.35;
}

.chapter-item-meta {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Content Area */
.content-container {
  flex: 1;
  overflow-y: auto;
  background: var(--bg-main);
  padding: 0;
  position: relative;
}

.view-panel {
  display: none;
  padding: 40px 60px;
  max-width: 1050px;
  margin: 0 auto;
}

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

/* Reader Toolbar */
.reader-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.reading-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.badge {
  background: rgba(0, 240, 255, 0.1);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.meta-item {
  font-size: 12px;
  color: var(--text-muted);
}

.reading-nav-buttons {
  display: flex;
  gap: 8px;
}

.btn-nav {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.btn-nav:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Reader Typography Styles */
.markdown-body {
  line-height: 1.8;
  color: var(--text-main);
}

.markdown-body.font-serif {
  font-family: var(--font-serif);
  font-size: 17px;
}

.markdown-body.font-sans {
  font-family: var(--font-sans);
  font-size: 15px;
}

.markdown-body h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-bright);
  margin: 20px 0 10px 0;
  line-height: 1.25;
}

.markdown-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-blue);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.markdown-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 28px 0 12px 0;
}

.markdown-body h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-bright);
  margin: 20px 0 8px 0;
}

.markdown-body p {
  margin-bottom: 18px;
}

.markdown-body ul, .markdown-body ol {
  margin: 16px 0 20px 28px;
}

.markdown-body li {
  margin-bottom: 8px;
}

.markdown-body strong {
  color: var(--text-bright);
  font-weight: 700;
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent-cyan);
  background: var(--bg-card);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-style: italic;
}

.markdown-body blockquote strong {
  font-style: normal;
  color: var(--accent-cyan);
}

.markdown-body pre {
  background: #080c14;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  margin: 24px 0;
  color: #38bdf8;
}

.markdown-body code {
  font-family: var(--font-mono);
  background: rgba(0, 240, 255, 0.08);
  color: var(--accent-cyan);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 13px;
}

.markdown-body th, .markdown-body td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

.markdown-body th {
  background: var(--bg-card);
  color: var(--text-bright);
  font-weight: 700;
}

.markdown-body tr:nth-child(even) {
  background: rgba(255,255,255,0.015);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 40px 0;
}

/* Large Footer Nav */
.reader-footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.btn-nav-large {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px 24px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.btn-nav-large:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 240, 255, 0.1);
}

.btn-nav-large .nav-direction {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.btn-nav-large .nav-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-bright);
}

/* India Map View */
.panel-header {
  margin-bottom: 30px;
}

.panel-header h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-bright);
}

.panel-header p {
  color: var(--text-muted);
  font-size: 14px;
}

.map-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 30px;
}

.hub-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin-bottom: 24px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

.hub-filter-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-right: 4px;
}

.hub-chip {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
  white-space: nowrap;
}

.hub-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

.hub-chip.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
  font-weight: 700;
}

.map-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

.map-layer-selector {
  display: flex;
  gap: 6px;
}

.layer-btn {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.layer-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--text-bright);
}

.layer-btn.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 700;
}

.map-controls-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
}

.india-leaflet-map-container {
  width: 100%;
  height: 600px;
  border-radius: 12px;
  overflow: hidden;
  background: #090e17;
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 1;
}

/* Custom Leaflet Dark Theme Overrides */
.leaflet-container {
  font-family: var(--font-sans) !important;
  background: #090e17 !important;
}

.leaflet-popup-content-wrapper {
  background: #0c1524 !important;
  color: #e2e8f0 !important;
  border: 1px solid var(--accent-cyan) !important;
  border-radius: 8px !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6) !important;
  padding: 4px !important;
}

.leaflet-popup-tip {
  background: #0c1524 !important;
}

.leaflet-popup-content {
  margin: 10px 14px !important;
  line-height: 1.4 !important;
}

.leaflet-popup-content h4 {
  margin: 0 0 4px 0;
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
}

.leaflet-popup-content .popup-sub {
  color: var(--accent-cyan);
  font-size: 11px;
  font-weight: 700;
  margin-bottom: 6px;
}

.leaflet-popup-content .popup-desc {
  font-size: 11px;
  color: #94a3b8;
  margin-bottom: 0;
}

/* Leaflet Custom DivIcon Markers */
.custom-dc-marker {
  position: relative;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.marker-pulse {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  animation: dcMarkerPulse 2s infinite ease-out;
}

.marker-core {
  position: relative;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.8);
  transition: transform 0.2s ease;
  z-index: 2;
}

.custom-dc-marker:hover .marker-core,
.custom-dc-marker.active .marker-core {
  transform: scale(1.4);
}

.marker-label-tag {
  position: absolute;
  left: 20px;
  top: -2px;
  background: rgba(10, 20, 35, 0.92);
  border: 1px solid var(--accent-cyan);
  color: #ffffff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
  z-index: 3;
}

@keyframes dcMarkerPulse {
  0% { transform: scale(0.4); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.map-interactive-area {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 16px;
  position: relative;
  overflow: hidden;
}

.map-svg {
  width: 100%;
  height: 580px;
  display: block;
}

.physical-india-map {
  border-radius: 12px;
  background: #02070f;
}

/* Geographic Relief Labels */
.geo-label {
  font-family: var(--font-sans);
  user-select: none;
  pointer-events: none;
}

.geo-label.water {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2px;
  fill: #38bdf8;
  opacity: 0.45;
}

.geo-label.mountain {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  fill: #93c5fd;
  opacity: 0.8;
}

.geo-label.plateau {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  fill: #94a3b8;
  opacity: 0.4;
}

.geo-label.ghats {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1px;
  fill: #64748b;
  opacity: 0.6;
}

.geo-label.small {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1px;
  fill: #94a3b8;
}

.geo-label.tiny {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.8px;
  fill: #38bdf8;
}

/* Subsea Cable Network */
.subsea-ray {
  stroke-dasharray: 6, 3;
  animation: subseaFlow 2.5s linear infinite;
}

@keyframes subseaFlow {
  from { stroke-dashoffset: 18; }
  to { stroke-dashoffset: 0; }
}

.cable-label {
  font-family: var(--font-mono);
  font-size: 8.5px;
  font-weight: 700;
  fill: #00f0ff;
  letter-spacing: 0.4px;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
}

/* Data Center Map Pins */
.map-pin {
  cursor: pointer;
  transition: all 0.2s ease;
}

.map-pin:hover .pin-core {
  transform: scale(1.3);
  stroke: #ffffff;
  stroke-width: 3;
}

.map-pin.active .pin-core {
  transform: scale(1.4);
  stroke: #ffffff;
  stroke-width: 3.5;
  filter: drop-shadow(0 0 10px #00f0ff);
}

.map-pin.active .pin-pulse {
  animation: pulse 1.2s infinite ease-out;
  fill: rgba(0, 240, 255, 0.6);
}

.pin-pulse {
  fill: rgba(56, 189, 248, 0.3);
  animation: pulse 2.2s infinite ease-out;
  transform-origin: center;
}

.pin-pulse.primary {
  fill: rgba(0, 240, 255, 0.4);
}

.pin-pulse.cyan {
  fill: rgba(6, 182, 212, 0.35);
}

.pin-pulse.green {
  fill: rgba(16, 185, 129, 0.35);
}

.pin-core {
  fill: #38bdf8;
  stroke: #ffffff;
  stroke-width: 2;
  transition: all 0.2s;
}

.pin-core.primary {
  fill: #00f0ff;
  stroke: #ffffff;
  stroke-width: 2.5;
}

.pin-core.cyan {
  fill: #06b6d4;
  stroke: #ffffff;
}

.pin-core.green {
  fill: #10b981;
  stroke: #ffffff;
}

.pin-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  fill: #ffffff;
  text-shadow: 0 1px 5px rgba(0,0,0,0.9), 0 0 8px rgba(0,0,0,0.8);
}

/* Legend Styling */
.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  font-size: 11.5px;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.legend-dot.primary { background: #00f0ff; box-shadow: 0 0 6px #00f0ff; }
.legend-dot.secondary { background: #38bdf8; }
.legend-dot.cyan { background: #06b6d4; }
.legend-dot.green { background: #10b981; box-shadow: 0 0 6px #10b981; }

.legend-line.subsea {
  width: 18px;
  height: 3px;
  background: #00f0ff;
  border-radius: 2px;
  box-shadow: 0 0 6px #00f0ff;
}

.legend-line.terrestrial {
  width: 18px;
  height: 3px;
  background: #f59e0b;
  border-radius: 2px;
}

/* Light Theme Adaptations for Physical Map */
body.theme-light .physical-india-map {
  background: #f0f9ff;
}

body.theme-light .india-border-crisp {
  fill: #f8fafc;
  stroke: #0284c7;
}

body.theme-light .geo-label.water {
  fill: #0369a1;
  opacity: 0.7;
}

body.theme-light .cable-label {
  fill: #0369a1;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.9);
}

body.theme-light .pin-label {
  fill: #0f172a;
  text-shadow: 0 1px 3px rgba(255,255,255,0.9), 0 0 6px rgba(255,255,255,0.8);
}

body.theme-light .markdown-body pre {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #0f172a;
}

body.theme-light .badge-tag {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #0284c7;
}

body.theme-light .search-result-item:hover {
  background: #f1f5f9;
}

@keyframes pulse {
  0% { r: 8px; opacity: 1; }
  100% { r: 24px; opacity: 0; }
}

.map-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
  font-size: 11px;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-dot.primary { background: #00f0ff; }
.legend-dot.secondary { background: #38bdf8; }
.legend-dot.green { background: #10b981; }

.map-details-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.badge-large {
  background: rgba(0, 240, 255, 0.15);
  color: var(--accent-cyan);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
}

.hub-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-box {
  background: var(--bg-main);
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.stat-box .stat-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.stat-box .stat-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
}

.hub-description h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  margin-top: 14px;
}

.hub-description p {
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.6;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-blue);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

/* Calculator Grid */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.calc-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
}

.calc-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-bright);
}

.range-with-val {
  display: flex;
  align-items: center;
  gap: 16px;
}

.range-with-val input[type="range"] {
  flex: 1;
  accent-color: var(--accent-cyan);
}

.val-badge {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-cyan);
  min-width: 70px;
  text-align: center;
  font-family: var(--font-mono);
}

.hint {
  font-size: 10px;
  color: var(--text-muted);
}

.styled-select {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
}

.results-box {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

.result-row strong {
  color: var(--text-bright);
  font-family: var(--font-mono);
}

.result-row.highlight {
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  font-size: 14px;
}

.result-row.highlight strong {
  color: var(--accent-emerald);
  font-size: 15px;
}

.capex-breakdown {
  margin-top: 10px;
}

.bar-chart {
  display: flex;
  height: 24px;
  border-radius: 6px;
  overflow: hidden;
  font-size: 9px;
  font-weight: 700;
  color: #ffffff;
  line-height: 24px;
  text-align: center;
}

/* All 6 Volumes Grid */
.volumes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
  margin-top: 10px;
}

.volume-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.volume-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 240, 255, 0.1);
}

.volume-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.vol-badge {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.1);
  padding: 4px 10px;
  border-radius: 6px;
}

.vol-status {
  font-size: 11px;
  color: var(--accent-emerald);
  font-weight: 600;
}

.vol-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
  margin-top: 8px;
}

.vol-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 4px;
}

.vol-desc {
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.5;
}

.vol-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  margin-top: 8px;
}

.vol-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.btn-sm {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-sm:hover {
  background: var(--accent-cyan);
  color: #0b0f17;
  border-color: var(--accent-cyan);
}

.volume-detail-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  margin-top: 20px;
}

.volume-detail-container.hidden {
  display: none;
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}

/* Tracker Summary Cards */
.tracker-summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.summary-card .s-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.summary-card .s-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-bright);
  font-family: var(--font-mono);
}

.summary-card .s-sub {
  font-size: 11px;
  color: var(--accent-cyan);
}

/* Data Tables */
.data-table-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.data-table th {
  background: var(--bg-sidebar);
  color: var(--text-bright);
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  vertical-align: top;
}

.data-table tr:hover td {
  background: var(--bg-hover);
}

.badge-tag {
  display: inline-block;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  margin-top: 4px;
  font-family: var(--font-mono);
}

/* Policy Cards */
.policy-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.policy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.policy-card .p-type {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--accent-purple);
  text-transform: uppercase;
}

.policy-card h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-bright);
}

.policy-card .p-authority {
  font-size: 11px;
  color: var(--text-muted);
}

.policy-card .p-clause {
  background: var(--bg-main);
  border-left: 3px solid var(--accent-cyan);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  font-size: 12px;
  color: var(--text-main);
}

.policy-card .p-impact {
  font-size: 12px;
  color: var(--text-muted);
}

/* Radar Rings */
.radar-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.radar-filter {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.radar-filter:hover, .radar-filter.active {
  color: var(--text-bright);
  border-color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.1);
}

.radar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.radar-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.radar-item.ring-adopt { border-left: 4px solid var(--accent-emerald); }
.radar-item.ring-trial { border-left: 4px solid var(--accent-blue); }
.radar-item.ring-assess { border-left: 4px solid var(--accent-amber); }
.radar-item.ring-hold { border-left: 4px solid #ef4444; }

.radar-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.radar-ring-badge {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
}

.ring-adopt .radar-ring-badge { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.ring-trial .radar-ring-badge { background: rgba(56, 189, 248, 0.15); color: var(--accent-blue); }
.ring-assess .radar-ring-badge { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.ring-hold .radar-ring-badge { background: rgba(239, 68, 68, 0.15); color: #ef4444; }

.radar-item h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-bright);
}

.radar-item p {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.45;
}

.radar-horizon {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-cyan);
}

/* Interviews Grid */
.interviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 24px;
}

.interview-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.interview-speaker {
  display: flex;
  gap: 14px;
  align-items: center;
}

.speaker-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #0b0f17;
  font-weight: 800;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.speaker-details h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-bright);
}

.speaker-details .speaker-role {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.3;
}

.interview-quote {
  font-family: var(--font-serif);
  font-size: 14px;
  font-style: italic;
  color: var(--text-bright);
  line-height: 1.6;
  border-left: 2px solid var(--accent-cyan);
  padding-left: 14px;
}

.interview-context {
  font-size: 12px;
  color: var(--text-muted);
}

.interview-takeaway {
  background: var(--bg-main);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 11px;
  color: var(--accent-emerald);
  font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .map-grid, .calc-grid, .volumes-grid, .policy-cards-grid, .interviews-grid {
    grid-template-columns: 1fr;
  }
  .view-panel {
    padding: 20px;
  }
  .sidebar {
    position: absolute;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    z-index: 150;
    box-shadow: 10px 0 30px rgba(0,0,0,0.5);
  }
}

/* =========================================================
   RICH VISUAL DIAGRAM CARDS (Replacing plain text diagrams)
   ========================================================= */

.visual-diagram-container {
  margin: 32px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.visual-diagram-header {
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.visual-diagram-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent-cyan);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.visual-diagram-badge {
  font-size: 10px;
  font-weight: 800;
  background: rgba(2, 132, 199, 0.1);
  color: var(--accent-cyan);
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

/* Layman Explainer Box */
.layman-explainer {
  background: rgba(2, 132, 199, 0.05);
  border-left: 4px solid var(--accent-cyan);
  padding: 12px 18px;
  margin-bottom: 20px;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-main);
}

.layman-explainer strong {
  color: var(--accent-cyan);
  font-weight: 700;
}

/* Visual Analogy Grid */
.analogy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.analogy-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.analogy-card .a-icon {
  font-size: 24px;
}

.analogy-card h6 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
}

.analogy-card p {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
  margin: 0;
}

/* Visual Pyramid for Storage */
.diagram-pyramid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.pyramid-level {
  border-radius: 8px;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ffffff;
  font-weight: 600;
  font-size: 12px;
  transition: transform 0.2s;
}

.pyramid-level:hover {
  transform: scale(1.02);
}

.pyramid-lvl-1 { width: 55%; background: linear-gradient(135deg, #ef4444, #f97316); }
.pyramid-lvl-2 { width: 75%; background: linear-gradient(135deg, #0ea5e9, #2563eb); }
.pyramid-lvl-3 { width: 95%; background: linear-gradient(135deg, #059669, #10b981); }

.pyramid-level span {
  font-family: var(--font-mono);
  font-size: 11px;
  background: rgba(0,0,0,0.25);
  padding: 2px 8px;
  border-radius: 4px;
}

.visual-diagram-body {
  padding: 24px;
}

/* 1. Step-Down Flow / Cascade Diagram */
.diagram-cascade {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cascade-step {
  display: flex;
  align-items: stretch;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.2s;
}

.cascade-step:hover {
  transform: translateX(4px);
  border-color: var(--accent-cyan);
}

.cascade-marker {
  width: 70px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  text-align: center;
  flex-shrink: 0;
}

.cascade-content {
  padding: 12px 18px;
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cascade-text h5 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
}

.cascade-text p {
  font-size: 11px;
  color: var(--text-muted);
  margin: 2px 0 0 0;
}

.cascade-metric {
  font-size: 12px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
}

.diagram-connector {
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--accent-cyan);
  font-size: 14px;
  margin: -4px 0;
}

/* 2. Timeline Bar Diagram (15-Second Power Bridge) */
.diagram-timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  padding-left: 28px;
  border-left: 3px solid var(--accent-cyan);
  margin-left: 10px;
}

.timeline-event {
  position: relative;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 18px;
}

.timeline-event::before {
  content: '';
  position: absolute;
  left: -35px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-cyan);
  border: 2px solid var(--bg-card);
}

.timeline-time {
  font-size: 11px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.timeline-event h5 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
}

.timeline-event p {
  font-size: 12px;
  color: var(--text-muted);
  margin: 4px 0 0 0;
}

/* 3. Layered Stack Diagram */
.diagram-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stack-layer {
  padding: 16px 20px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stack-layer.intelligence { border-left: 4px solid var(--accent-purple); }
.stack-layer.computing { border-left: 4px solid var(--accent-blue); }
.stack-layer.physical { border-left: 4px solid var(--accent-emerald); }

.stack-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
}

.stack-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.stack-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.04);
}

/* 4. Clos Leaf-Spine Network Grid */
.diagram-clos {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

.clos-spine-row, .clos-leaf-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}

.clos-node {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 18px;
  text-align: center;
  min-width: 140px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.clos-node.spine { border-top: 3px solid var(--accent-purple); }
.clos-node.leaf { border-top: 3px solid var(--accent-blue); }

.clos-node-name {
  font-size: 12px;
  font-weight: 800;
  color: var(--text-bright);
}

.clos-node-sub {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

.clos-interconnect-lines {
  width: 100%;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 10px,
    var(--border-color) 10px,
    var(--border-color) 12px
  );
  border-radius: 4px;
}

.clos-interconnect-label {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 4px 14px;
  border-radius: 14px;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* Search Term Highlight */
mark.search-match {
  background: #fef08a;
  color: #0f172a;
  padding: 1px 4px;
  border-radius: 3px;
}

/* =========================================================
   PRINT / PDF EXPORT STYLESHEET
   ========================================================= */

@media print {
  /* Hide UI controls during print */
  .top-header,
  .sidebar,
  .reader-toolbar,
  .reader-footer-nav,
  .search-dropdown,
  .nav-tabs,
  #sidebar-toggle,
  .reading-nav-buttons,
  .reader-controls {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #1e293b !important;
    font-size: 12pt;
    line-height: 1.6;
  }

  .app-layout, .main-body, .content-container, .view-panel {
    display: block !important;
    height: auto !important;
    overflow: visible !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .markdown-body {
    max-width: 100% !important;
    padding: 20px 40px !important;
  }

  .visual-diagram-container {
    page-break-inside: avoid;
    border: 1px solid #cbd5e1 !important;
    box-shadow: none !important;
  }

  table {
    page-break-inside: avoid;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  /* Watermark header for publication export */
  .markdown-body::before {
    content: "DATA CENTERS & THE WAY AHEAD | Dr. Satya N. Gupta & Kalyanjit Hatibaruah";
    display: block;
    text-align: center;
    font-size: 9pt;
    color: #64748b;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 10px;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
  }
}

/* Chapter Hero & Embedded Image Cards */
.chapter-image-card {
  margin: 32px 0 40px 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: block;
}

.chapter-image-card:hover {
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.14);
}

.chapter-img {
  width: 100%;
  height: auto;
  max-height: 560px;
  object-fit: contain;
  background: #ffffff;
  display: block;
  margin: 0 auto;
}

.image-caption {
  padding: 14px 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-style: normal;
  letter-spacing: -0.01em;
}