/* ==========================================================================
   Kindle Web Reader Stylesheet
   Authentic e-reader experience with Paperwhite/Warm/Dark themes
   ========================================================================== */

:root {
  --reader-bg: #FAF7F0;
  --reader-text: #1F1F1F;
  --reader-muted: #6B6862;
  --reader-border: #E5E1D8;
  --chrome-bg: rgba(250, 247, 240, 0.95);
  --drawer-bg: #FFFFFF;
  --drawer-border: #E8E5DD;
  --active-accent: #2A2A2A;
  --card-bg: #F0ECE1;
  --font-base: 'Literata', Georgia, serif;
  --font-size: 19px;
  --line-height: 1.85;
  --content-max-width: 720px;
  --bezel-bg: #1A1A1A;
  --bezel-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
}

/* Themes */
body.theme-paper {
  --reader-bg: #FAF7F0;
  --reader-text: #1F1F1F;
  --reader-muted: #6B6862;
  --reader-border: #E8E4DA;
  --chrome-bg: rgba(250, 247, 240, 0.96);
  --drawer-bg: #FAF7F0;
  --drawer-border: #E5E0D5;
  --active-accent: #111111;
  --card-bg: #F0ECE0;
}

body.theme-sepia {
  --reader-bg: #F4ECD8;
  --reader-text: #36291C;
  --reader-muted: #7E6D59;
  --reader-border: #E2D7C0;
  --chrome-bg: rgba(244, 236, 216, 0.96);
  --drawer-bg: #F4ECD8;
  --drawer-border: #DCD0B5;
  --active-accent: #4A3825;
  --card-bg: #EAE0C5;
}

body.theme-mint {
  --reader-bg: #EBF2EB;
  --reader-text: #1B291E;
  --reader-muted: #5B7260;
  --reader-border: #D3E0D4;
  --chrome-bg: rgba(235, 242, 235, 0.96);
  --drawer-bg: #EBF2EB;
  --drawer-border: #C8D6C9;
  --active-accent: #233A27;
  --card-bg: #DFEADF;
}

body.theme-dark {
  --reader-bg: #141414;
  --reader-text: #D6D6D6;
  --reader-muted: #8E8E8E;
  --reader-border: #2A2A2A;
  --chrome-bg: rgba(20, 20, 20, 0.96);
  --drawer-bg: #1A1A1A;
  --drawer-border: #2C2C2C;
  --active-accent: #E5E5E5;
  --card-bg: #222222;
}

/* Fonts */
body.font-literata { --font-base: 'Literata', Georgia, serif; }
body.font-merriweather { --font-base: 'Merriweather', Georgia, serif; }
body.font-georgia { --font-base: Georgia, 'Times New Roman', serif; }
body.font-sans { --font-base: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; }

/* Line Spacing */
body.spacing-compact { --line-height: 1.55; }
body.spacing-normal { --line-height: 1.85; }
body.spacing-relaxed { --line-height: 2.15; }

/* Margins */
body.margin-narrow { --content-max-width: 860px; }
body.margin-medium { --content-max-width: 720px; }
body.margin-wide { --content-max-width: 580px; }

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--reader-bg);
  color: var(--reader-text);
  font-family: var(--font-base);
  font-size: var(--font-size);
  line-height: var(--line-height);
  transition: background-color 0.25s ease, color 0.25s ease;
  user-select: text;
}

/* Device Container & Bezel Mode */
.device-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

body[data-device-bezel="true"] {
  background-color: #2D2D2D !important;
}

body[data-device-bezel="true"] .device-container {
  padding: 24px;
}

body[data-device-bezel="true"] .kindle-bezel {
  width: 100%;
  max-width: 840px;
  height: 94vh;
  max-height: 1100px;
  background: var(--bezel-bg);
  border-radius: 28px;
  padding: 32px 30px 48px 30px;
  box-shadow: var(--bezel-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

body[data-device-bezel="true"] .bezel-footer-logo {
  display: block;
}

.bezel-footer-logo {
  display: none;
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.3);
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 2px;
  pointer-events: none;
  user-select: none;
}

.kindle-bezel {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background: var(--reader-bg);
}

body[data-device-bezel="true"] .reader-viewport {
  border-radius: 8px;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.06);
}

/* Chrome Bars (Header & Footer) */
.top-chrome, .bottom-chrome {
  position: absolute;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--chrome-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--reader-border);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
}

.top-chrome {
  top: 0;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--reader-border);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.top-chrome.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.bottom-chrome {
  bottom: 0;
  height: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8px 20px 10px;
  border-top: 1px solid var(--reader-border);
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

.bottom-chrome.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.chrome-left, .chrome-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.book-info-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--reader-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 50vw;
}

.book-title-short {
  font-weight: 500;
  color: var(--reader-text);
}

.chapter-title-short {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-divider {
  opacity: 0.5;
}

/* Icon Buttons */
.icon-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--reader-text);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}

.icon-btn:hover {
  background-color: var(--reader-border);
}

.aa-icon {
  font-family: Georgia, serif;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -1px;
}

.pill-btn {
  width: auto;
  padding: 0 10px;
  height: 30px;
  border: 1px solid var(--reader-border);
  border-radius: 15px;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  color: var(--reader-muted);
}

.pill-btn:hover {
  border-color: var(--reader-muted);
  color: var(--reader-text);
}

/* Bottom Chrome Items */
.bottom-progress-track {
  width: 100%;
  margin-bottom: 6px;
}

.bottom-progress-track input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--reader-border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.bottom-progress-track input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--active-accent);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.bottom-progress-track input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

.bottom-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: 'Inter', sans-serif;
  font-size: 11.5px;
  color: var(--reader-muted);
}

.stats-left, .stats-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-dot {
  opacity: 0.5;
}

/* Reader Viewport & Touch Zones */
.reader-viewport {
  flex: 1;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  background: var(--reader-bg);
}

.tap-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 10;
}

.tap-zone-left {
  left: 0;
  width: 20%;
  cursor: pointer;
}

.tap-zone-center {
  left: 20%;
  width: 60%;
  cursor: default;
}

.tap-zone-right {
  right: 0;
  width: 20%;
  cursor: pointer;
}

/* Reader Scrollable Content */
.reader-content {
  width: 100%;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 60px 24px 80px;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar */
.reader-content::-webkit-scrollbar {
  width: 5px;
}
.reader-content::-webkit-scrollbar-track {
  background: transparent;
}
.reader-content::-webkit-scrollbar-thumb {
  background: var(--reader-border);
  border-radius: 4px;
}

.chapter-view {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 20px 0 60px;
}

/* Typography Inside Chapter */
.chapter-header {
  margin-bottom: 40px;
  text-align: center;
}

.chapter-number-pill {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--reader-muted);
  margin-bottom: 12px;
}

.chapter-title-main {
  font-size: 1.75em;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--reader-text);
}

.chapter-meta-line {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  color: var(--reader-muted);
}

.chapter-text p {
  margin-bottom: 1.45em;
  text-indent: 1.5em;
  text-align: justify;
  hyphens: auto;
}

.chapter-text p:first-of-type {
  text-indent: 0;
}

/* First paragraph drop cap */
.chapter-text p:first-of-type::first-letter {
  float: left;
  font-size: 3.3em;
  line-height: 0.85;
  padding-top: 4px;
  padding-right: 8px;
  padding-bottom: 2px;
  font-family: 'Literata', Georgia, serif;
  font-weight: 600;
  color: var(--reader-text);
}

/* Scene breaks (***) */
.scene-break {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 2.2em 0;
  color: var(--reader-muted);
  user-select: none;
}

.scene-break span {
  font-size: 18px;
  line-height: 1;
}

/* Footer Chapter Switcher */
.chapter-nav-footer {
  max-width: var(--content-max-width);
  margin: 50px auto 30px;
  padding-top: 24px;
  border-top: 1px solid var(--reader-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  color: var(--reader-text);
  border: 1px solid var(--reader-border);
  border-radius: 8px;
  padding: 10px 18px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-nav:hover:not(:disabled) {
  background: var(--reader-border);
  transform: translateY(-1px);
}

.btn-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.footer-chapter-indicator {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  color: var(--reader-muted);
}

/* ==========================================================================
   Table of Contents Slide-in Drawer
   ========================================================================== */
.toc-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 380px;
  max-width: 86vw;
  background: var(--drawer-bg);
  border-right: 1px solid var(--drawer-border);
  z-index: 100;
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: 10px 0 30px rgba(0, 0, 0, 0.12);
}

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

.drawer-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--drawer-border);
}

.drawer-title-group h3 {
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 2px;
}

.drawer-subtitle {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  color: var(--reader-muted);
}

.drawer-search {
  padding: 12px 20px;
  border-bottom: 1px solid var(--drawer-border);
}

.drawer-search input {
  width: 100%;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--drawer-border);
  background: var(--card-bg);
  color: var(--reader-text);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  outline: none;
}

.drawer-search input:focus {
  border-color: var(--reader-muted);
}

.drawer-meta-card {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 12px 20px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--drawer-border);
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  text-transform: uppercase;
  color: var(--reader-muted);
  letter-spacing: 0.5px;
}

.meta-val {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  color: var(--reader-text);
  margin-top: 2px;
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
  padding: 8px 0;
}

.toc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  cursor: pointer;
  border-bottom: 1px solid var(--drawer-border);
  transition: background-color 0.12s ease;
}

.toc-item:hover {
  background-color: var(--card-bg);
}

.toc-item.active {
  background-color: var(--card-bg);
  border-left: 4px solid var(--active-accent);
}

.toc-item-title {
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.35;
  color: var(--reader-text);
}

.toc-item.active .toc-item-title {
  font-weight: 600;
}

.toc-item-meta {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  color: var(--reader-muted);
  margin-top: 3px;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   Aa Appearance Settings Modal
   ========================================================================== */
.settings-modal {
  position: fixed;
  top: 64px;
  right: 20px;
  width: 340px;
  max-width: 92vw;
  background: var(--drawer-bg);
  border: 1px solid var(--drawer-border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.16);
  z-index: 100;
  opacity: 0;
  transform: translateY(-8px) scale(0.97);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.settings-modal.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--drawer-border);
}

.settings-header h4 {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
}

.setting-group {
  margin-bottom: 18px;
}

.setting-label {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 11.5px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--reader-muted);
  margin-bottom: 8px;
}

/* Theme Picker */
.theme-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.theme-opt {
  padding: 10px 0;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--drawer-border);
  cursor: pointer;
  transition: transform 0.1s ease, border-color 0.15s ease;
}

.theme-opt:hover {
  transform: scale(1.03);
}

.theme-opt.active {
  border: 2px solid var(--active-accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-btn-paper { background: #FAF7F0; color: #1F1F1F; }
.theme-btn-sepia { background: #F4ECD8; color: #36291C; }
.theme-btn-mint  { background: #EBF2EB; color: #1B291E; }
.theme-btn-dark  { background: #141414; color: #D6D6D6; border-color: #333; }

/* Font Picker */
.font-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.font-opt {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--drawer-border);
  background: var(--card-bg);
  color: var(--reader-text);
  font-size: 12.5px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s ease;
}

.font-opt.active {
  border-color: var(--active-accent);
  font-weight: 600;
  background: var(--reader-border);
}

/* Font Size Stepper */
.stepper-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card-bg);
  border-radius: 10px;
  padding: 6px 10px;
  border: 1px solid var(--drawer-border);
}

.step-btn {
  background: transparent;
  border: none;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 14px;
  color: var(--reader-text);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 6px;
}

.step-btn:hover {
  background: var(--reader-border);
}

.step-indicators {
  display: flex;
  align-items: center;
  gap: 6px;
}

.step-bar {
  width: 14px;
  height: 4px;
  background: var(--reader-border);
  border-radius: 2px;
  transition: all 0.15s ease;
}

.step-bar.active {
  background: var(--active-accent);
  height: 6px;
}

/* Segmented Buttons */
.setting-group-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-group-segmented {
  display: flex;
  background: var(--card-bg);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--drawer-border);
}

.seg-btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 6px 4px;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  color: var(--reader-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.seg-btn.active {
  background: var(--reader-bg);
  color: var(--reader-text);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.settings-backdrop {
  position: fixed;
  inset: 0;
  z-index: 95;
  display: none;
}

.settings-backdrop.open {
  display: block;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  .reader-content {
    padding: 50px 16px 70px;
  }
  .chapter-title-main {
    font-size: 1.5em;
  }
  .book-info-header {
    max-width: 40vw;
  }
  .pill-btn {
    display: none;
  }
}