/* ╔══════════════════════════════════════════════╗
   ║  ANTI BOOK READER — Design System & Styles  ║
   ╚══════════════════════════════════════════════╝ */

/* ── CSS Custom Properties (Theme Tokens) ── */
:root {
  /* Light Theme (default) */
  --bg-primary: #FAF6F0;
  --bg-secondary: #F0EBE3;
  --bg-toolbar: rgba(250, 246, 240, 0.92);
  --bg-sidebar: rgba(240, 235, 227, 0.97);
  --bg-card: #FFFFFF;
  --bg-popover: #FFFFFF;

  --text-primary: #2D2A26;
  --text-secondary: #6B6560;
  --text-muted: #9E9891;
  --text-accent: #B8860B;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.15);

  --accent: #C4803C;
  --accent-glow: rgba(196, 128, 60, 0.15);
  --accent-gradient: linear-gradient(135deg, #C4803C, #D4A574);

  --progress-gradient: linear-gradient(90deg, #C4803C, #D4A574, #E8C99B);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-popover: 0 12px 48px rgba(0,0,0,0.18);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Lora', 'Georgia', 'Times New Roman', serif;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --line-height: 1.7;
  --content-max-width: 720px;

  --toolbar-height: 56px;
  --progress-height: 3px;
  --sidebar-width: 300px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --bg-primary: #141418;
  --bg-secondary: #1C1C22;
  --bg-toolbar: rgba(20, 20, 24, 0.94);
  --bg-sidebar: rgba(28, 28, 34, 0.98);
  --bg-card: #22222A;
  --bg-popover: #1E1E26;

  --text-primary: #E8E4DF;
  --text-secondary: #A09B94;
  --text-muted: #696460;
  --text-accent: #E8B86D;

  --border-color: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  --accent: #E8B86D;
  --accent-glow: rgba(232, 184, 109, 0.12);
  --accent-gradient: linear-gradient(135deg, #E8B86D, #D4A574);

  --progress-gradient: linear-gradient(90deg, #E8B86D, #D4A574, #C4803C);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.45);
  --shadow-popover: 0 12px 48px rgba(0,0,0,0.55);
}

/* ── Sepia Theme ── */
[data-theme="sepia"] {
  --bg-primary: #F4ECD8;
  --bg-secondary: #E8DFC8;
  --bg-toolbar: rgba(244, 236, 216, 0.94);
  --bg-sidebar: rgba(232, 223, 200, 0.98);
  --bg-card: #FBF5E6;
  --bg-popover: #FBF5E6;

  --text-primary: #3B3228;
  --text-secondary: #6B5E50;
  --text-muted: #8C7E6E;
  --text-accent: #8B5E34;

  --border-color: rgba(59, 50, 40, 0.1);
  --border-strong: rgba(59, 50, 40, 0.18);

  --accent: #8B5E34;
  --accent-glow: rgba(139, 94, 52, 0.12);
  --accent-gradient: linear-gradient(135deg, #8B5E34, #A67B5B);
  --progress-gradient: linear-gradient(90deg, #8B5E34, #A67B5B, #C4A882);
}


/* ══════════════════════════════════════
   BASE RESET & TYPOGRAPHY
   ══════════════════════════════════════ */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  height: 100%;
}

body {
  font-family: var(--font-body);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100%;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ══════════════════════════════════════
   PROGRESS BAR
   ══════════════════════════════════════ */

#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--progress-height);
  background: var(--bg-secondary);
  z-index: 1000;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  width: 0%;
  background: var(--progress-gradient);
  transition: width 0.15s ease-out;
  border-radius: 0 2px 2px 0;
  will-change: width;
}


/* ══════════════════════════════════════
   TOOLBAR
   ══════════════════════════════════════ */

#toolbar {
  position: fixed;
  top: var(--progress-height);
  left: 0;
  right: 0;
  height: var(--toolbar-height);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--bg-toolbar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 900;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

#toolbar button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  min-width: 36px;
  min-height: 36px;
  -webkit-tap-highlight-color: transparent;
}

#toolbar button:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

#toolbar button:active {
  transform: scale(0.94);
}

#book-title-bar {
  flex: 1;
  min-width: 0;
  text-align: center;
}

#book-title {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}

#chapter-title-bar {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#toolbar-controls {
  display: flex;
  align-items: center;
  gap: 2px;
}

#font-decrease, #font-increase {
  font-size: 13px !important;
  letter-spacing: -0.05em;
}

#font-decrease sup, #font-increase sup {
  font-size: 9px;
  margin-left: 1px;
}


/* ══════════════════════════════════════
   TOC SIDEBAR
   ══════════════════════════════════════ */

#toc-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
  z-index: 950;
}

#toc-overlay.active {
  opacity: 1;
  visibility: visible;
}

#toc-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  background: var(--bg-sidebar);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform var(--transition-smooth);
  z-index: 960;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

#toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

#toc-header h2 {
  font-family: var(--font-ui);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

#toc-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

#toc-close:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

#toc-list {
  list-style: none;
  padding: 12px 0;
  overflow-y: auto;
  flex: 1;
  -webkit-overflow-scrolling: touch;
}

#toc-list li {
  position: relative;
}

#toc-list li a {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  gap: 10px;
}

#toc-list li a:hover {
  background: var(--accent-glow);
  color: var(--text-primary);
}

#toc-list li.active a {
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--accent-glow);
}

#toc-list li .chapter-number {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 22px;
  text-align: center;
  opacity: 0.7;
}

#toc-list li.active .chapter-number {
  color: var(--accent);
  opacity: 1;
}

/* Sub-headings within TOC */
#toc-list li.toc-sub {
  /* indent sub-headings */
}

#toc-list li.toc-sub a {
  padding-left: 52px;
  font-size: 13px;
  color: var(--text-muted);
  border-left-color: transparent;
}

#toc-list li.toc-sub a:hover {
  color: var(--text-secondary);
}


/* ══════════════════════════════════════
   MAIN READER CONTENT
   ══════════════════════════════════════ */

#reader-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: calc(var(--toolbar-height) + var(--progress-height) + 32px) 20px 40px;
  min-height: 100vh;
  min-height: 100dvh;
}

#chapter-content {
  animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}


/* ── Typography within chapters ── */

#chapter-content h1 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

#chapter-content .chapter-subtitle {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

#chapter-content h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  font-style: italic;
  color: var(--text-muted);
  margin: 2.5rem 0 1rem;
  letter-spacing: 0;
  line-height: 1.3;
}

#chapter-content h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

#chapter-content h4 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2.5rem 0 1rem;
}

#chapter-content p {
  margin-bottom: 1.2em;
  color: var(--text-primary);
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

#chapter-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-glow);
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
}

#chapter-content a:hover {
  text-decoration-color: var(--accent);
}

#chapter-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

#chapter-content em {
  font-style: italic;
}

#chapter-content blockquote {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin: 1.5em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  font-style: italic;
  color: var(--text-secondary);
}

#chapter-content blockquote p:last-child {
  margin-bottom: 0;
}

#chapter-content ul, #chapter-content ol {
  margin: 1em 0;
  padding-left: 1.5em;
}

#chapter-content li {
  margin-bottom: 0.4em;
  padding-left: 0.3em;
}

#chapter-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1.5em 0;
  box-shadow: var(--shadow-md);
}

#chapter-content figure {
  margin: 2em 0;
  text-align: center;
}

#chapter-content figcaption {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 8px;
  font-style: italic;
}

#chapter-content hr {
  border: none;
  height: 1px;
  background: var(--border-color);
  margin: 2.5em 0;
}

#chapter-content code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.88em;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-accent);
}

#chapter-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 1.5em 0;
  -webkit-overflow-scrolling: touch;
}

#chapter-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.6;
}

#chapter-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.92rem;
  overflow-x: auto;
  display: block;
  -webkit-overflow-scrolling: touch;
}

#chapter-content thead {
  display: table-header-group;
}

#chapter-content tbody {
  display: table-row-group;
}

#chapter-content tr {
  display: table-row;
}

#chapter-content th, #chapter-content td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
  display: table-cell;
}

#chapter-content th {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg-secondary);
}


/* ══════════════════════════════════════
   FOOTNOTES
   ══════════════════════════════════════ */

.footnote-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-glow);
  border-radius: 50%;
  cursor: pointer;
  vertical-align: super;
  text-decoration: none;
  transition: all var(--transition-fast);
  margin: 0 2px;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

.footnote-ref:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.15);
}

#footnote-backdrop {
  position: fixed;
  inset: 0;
  z-index: 970;
  display: none;
}

#footnote-backdrop.active {
  display: block;
}

#footnote-popover {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-popover);
  border-top: 1px solid var(--border-color);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  box-shadow: var(--shadow-popover);
  padding: 0 20px 24px;
  z-index: 980;
  transform: translateY(100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth), visibility var(--transition-smooth);
  max-height: 50vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

#footnote-popover.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

#footnote-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0 12px;
  position: sticky;
  top: 0;
  background: var(--bg-popover);
}

#footnote-label {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

#footnote-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

#footnote-close:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

#footnote-body {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* Drag handle for mobile */
#footnote-popover::before {
  content: '';
  display: block;
  width: 36px;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  margin: 10px auto 0;
}


/* ══════════════════════════════════════
   CHAPTER NAVIGATION
   ══════════════════════════════════════ */

#chapter-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  gap: 12px;
}

#chapter-nav button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid transparent;
  padding: 10px 18px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

#chapter-nav button:hover:not(:disabled) {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

#chapter-nav button:active:not(:disabled) {
  transform: translateY(0) scale(0.97);
}

#chapter-nav button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

#chapter-indicator {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}


/* ══════════════════════════════════════
   LOADER
   ══════════════════════════════════════ */

#loader {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 9999;
  gap: 16px;
  transition: opacity 0.3s ease;
}

#loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#loader p {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--text-muted);
}


/* ══════════════════════════════════════
   INTERACTIVE MAP COMPONENTS
   ══════════════════════════════════════ */

.interactive-map {
  position: relative;
  width: 100%;
  margin: 2em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.interactive-map img,
.interactive-map svg {
  width: 100%;
  height: auto;
  display: block;
}

.map-hotspot {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  box-shadow: var(--shadow-md), 0 0 0 0 rgba(196, 128, 60, 0.4);
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition: all var(--transition-fast);
  animation: hotspot-pulse 2s ease-in-out infinite;
  z-index: 2;
}

@keyframes hotspot-pulse {
  0%, 100% { box-shadow: var(--shadow-md), 0 0 0 0 rgba(196, 128, 60, 0.4); }
  50% { box-shadow: var(--shadow-md), 0 0 0 10px rgba(196, 128, 60, 0); }
}

.map-hotspot:hover {
  transform: translate(-50%, -50%) scale(1.2);
  animation: none;
}

.map-hotspot-label {
  position: absolute;
  top: 50%;
  left: calc(100% + 8px);
  transform: translateY(-50%);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-popover);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.map-hotspot:hover .map-hotspot-label {
  opacity: 1;
}

.map-tooltip {
  position: absolute;
  background: var(--bg-popover);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 260px;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
}

.map-tooltip.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.map-tooltip h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.map-caption {
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 10px 16px 14px;
  font-style: italic;
}


/* ══════════════════════════════════════
   INFOGRAPHIC COMPONENTS
   ══════════════════════════════════════ */

.infographic {
  margin: 2em 0;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.infographic-title {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

/* Stat Cards */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 14px;
  margin: 1em 0;
}

.stat-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 18px 14px;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-family: var(--font-ui);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Progress Bars */
.progress-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 1em 0;
}

.progress-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.progress-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.progress-item-label {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
}

.progress-item-value {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  width: 0%;
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.progress-bar-fill.animated {
  /* width set via inline style */
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 28px;
  margin: 1.5em 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--border-strong);
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  padding-bottom: 24px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.timeline-date {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.timeline-title {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Comparison chart */
.comparison-chart {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 1em 0;
}

.comparison-side {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 18px;
}

.comparison-side h4 {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  text-align: center;
}

.comparison-side ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.comparison-side li {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
  padding-left: 0;
}

.comparison-side li:last-child {
  border-bottom: none;
}

/* Callout Boxes */
.callout {
  margin: 1.5em 0;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border-left: 4px solid;
  font-size: 0.92rem;
}

.callout-info {
  background: rgba(59, 130, 246, 0.08);
  border-left-color: #3B82F6;
}

.callout-warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: #F59E0B;
}

.callout-success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: #10B981;
}

.callout-danger {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: #EF4444;
}

.callout-title {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.callout-info .callout-title { color: #3B82F6; }
.callout-warning .callout-title { color: #F59E0B; }
.callout-success .callout-title { color: #10B981; }
.callout-danger .callout-title { color: #EF4444; }


/* ══════════════════════════════════════
   DESKTOP ENHANCEMENTS
   ══════════════════════════════════════ */

@media (min-width: 768px) {
  :root {
    --toolbar-height: 60px;
    --progress-height: 3px;
  }

  #reader-content {
    padding-left: 32px;
    padding-right: 32px;
  }

  #chapter-content h1 {
    font-size: 2.2rem;
  }

  /* Desktop footnote popover can float near the reference */
  #footnote-popover {
    bottom: auto;
    left: 50%;
    right: auto;
    max-width: 420px;
    border-radius: var(--radius-lg);
    transform: translate(-50%, 10px);
    border: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
  }

  #footnote-popover.active {
    transform: translate(-50%, 0);
  }

  #footnote-popover::before {
    display: none;
  }

  .comparison-chart {
    gap: 20px;
  }

  .stat-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ══════════════════════════════════════
   SMALL MOBILE TWEAKS
   ══════════════════════════════════════ */

@media (max-width: 400px) {
  :root {
    --font-size-base: 16px;
  }

  #reader-content {
    padding-left: 16px;
    padding-right: 16px;
  }

  #chapter-content h1 {
    font-size: 1.6rem;
  }

  #chapter-content h2 {
    font-size: 1.25rem;
  }

  .comparison-chart {
    grid-template-columns: 1fr;
  }

  #chapter-nav button span {
    display: none;
  }
}


/* ══════════════════════════════════════
   PRINT STYLES
   ══════════════════════════════════════ */

@media print {
  #toolbar, #progress-bar, #toc-sidebar, #toc-overlay,
  #chapter-nav, #footnote-popover, #footnote-backdrop, #loader {
    display: none !important;
  }

  #reader-content {
    padding-top: 0;
    max-width: 100%;
  }

  body {
    background: #fff;
    color: #000;
  }
}


/* ══════════════════════════════════════
   ACCESSIBILITY & FOCUS STATES
   ══════════════════════════════════════ */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible) {
  outline: none;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}


/* ══════════════════════════════════════
   SCROLLBAR STYLING
   ══════════════════════════════════════ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}


/* ══════════════════════════════════════
   INTERACTIVE MEDIA MODAL & CARDS
   ══════════════════════════════════════ */

.interactive-feature-card {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 2.5em 0;
  padding: 18px 24px;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.interactive-feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-hover, rgba(196, 128, 60, 0.05));
  border-color: var(--text-accent);
}

.interactive-feature-icon {
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.interactive-feature-text {
  flex: 1;
  min-width: 0;
}

.interactive-feature-text h4 {
  margin: 0 0 4px !important;
  font-family: var(--font-ui) !important;
  font-size: 1.1rem !important;
  color: var(--accent) !important;
  letter-spacing: 0 !important;
}

.interactive-feature-text p {
  margin: 0 !important;
  font-size: 0.9rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.4 !important;
}

.interactive-feature-arrow {
  color: var(--accent);
  font-size: 24px;
  font-weight: 300;
  transition: transform var(--transition-fast);
}

.interactive-feature-card:hover .interactive-feature-arrow {
  transform: translateX(4px);
}

#media-modal {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth), visibility var(--transition-smooth);
}

#media-modal.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

#media-modal-header {
  height: var(--toolbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

#media-modal-title {
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

#media-modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

#media-modal-close:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

#media-modal-content {
  flex: 1;
  position: relative;
  background: #000;
  overflow: hidden;
}

#media-modal-iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}