/* ==========================================================================
   THE LAWS OF HUMAN NATURE — IMMERSIVE READER STYLESHEET
   Clean, Serene, Book-Grade Typography with Comfortable Margins
   ========================================================================== */

/* --- 1. CSS VARIABLES & THEMES --- */
:root {
  /* System / Layout defaults */
  --font-serif: "Newsreader", Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-lora: "Lora", Georgia, serif;
  --font-atkinson: "Atkinson Hyperlegible", "Segoe UI", -apple-system, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;

  --current-font: var(--font-serif);
  --font-size: 20px;
  --line-height-val: 1.82;
  --max-content-width: 670px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-fast: 0.16s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --header-height: 54px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* Theme 1: Paper Warm (Default - gentle on the eyes, feels like a real book) */
[data-theme="paper"] {
  --bg-primary: #FAF7F2;
  --bg-secondary: #F2ECE1;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFDFC;
  --text-main: #23201D;
  --text-muted: #665F56;
  --text-faint: #999084;
  --accent: #8E6842;
  --accent-soft: rgba(142, 104, 66, 0.1);
  --border-color: #E8E2D7;
  --border-light: #F0EAE0;
  --highlight-yellow: #FFF1B8;
  --callout-teacher-bg: #F8F4EC;
  --callout-teacher-border: #DECDB3;
  --card-takeaway-bg: #F1F6F3;
  --card-takeaway-border: #B7D9C6;
  --card-reflection-bg: #F3F4FA;
  --card-reflection-border: #C8CCE6;
  --card-practical-bg: #FBF4EC;
  --card-practical-border: #E8CCB2;
  --shadow-sm: 0 2px 8px rgba(35, 32, 29, 0.04);
  --shadow-md: 0 8px 24px rgba(35, 32, 29, 0.07);
  --shadow-lg: 0 16px 40px rgba(35, 32, 29, 0.11);
}

/* Theme 2: Sepia Glow */
[data-theme="sepia"] {
  --bg-primary: #F4ECD8;
  --bg-secondary: #EBE0C5;
  --bg-surface: #FDF6E2;
  --bg-surface-elevated: #FFFDF4;
  --text-main: #34281B;
  --text-muted: #6B563E;
  --text-faint: #947C62;
  --accent: #9A6626;
  --accent-soft: rgba(154, 102, 38, 0.13);
  --border-color: #DECFA8;
  --border-light: #E8DDC0;
  --highlight-yellow: #FFE399;
  --callout-teacher-bg: #EDE1C2;
  --callout-teacher-border: #CBB07E;
  --card-takeaway-bg: #E6EEDC;
  --card-takeaway-border: #A3BD96;
  --card-reflection-bg: #E9E5EE;
  --card-reflection-border: #BCAFCF;
  --card-practical-bg: #F2E4D4;
  --card-practical-border: #D5B391;
  --shadow-sm: 0 2px 8px rgba(52, 40, 27, 0.05);
  --shadow-md: 0 8px 24px rgba(52, 40, 27, 0.09);
  --shadow-lg: 0 16px 40px rgba(52, 40, 27, 0.13);
}

/* Theme 3: OLED Midnight (Pure Black for battery saving & dark rooms) */
[data-theme="night"] {
  --bg-primary: #000000;
  --bg-secondary: #0D0F12;
  --bg-surface: #131518;
  --bg-surface-elevated: #1A1D22;
  --text-main: #E3E5E8;
  --text-muted: #9BA2AE;
  --text-faint: #5B6370;
  --accent: #DDB077;
  --accent-soft: rgba(221, 176, 119, 0.14);
  --border-color: #24272E;
  --border-light: #1A1D23;
  --highlight-yellow: rgba(221, 176, 119, 0.32);
  --callout-teacher-bg: #14130F;
  --callout-teacher-border: #4D3C23;
  --card-takeaway-bg: #0D1611;
  --card-takeaway-border: #1E3D2D;
  --card-reflection-bg: #10121C;
  --card-reflection-border: #283457;
  --card-practical-bg: #18110B;
  --card-practical-border: #4E2E17;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.9);
}

/* Theme 4: Slate Dark */
[data-theme="slate"] {
  --bg-primary: #13161C;
  --bg-secondary: #1B1E26;
  --bg-surface: #202531;
  --bg-surface-elevated: #272E3D;
  --text-main: #D9E0EB;
  --text-muted: #8E98AC;
  --text-faint: #5C6578;
  --accent: #78A6E8;
  --accent-soft: rgba(120, 166, 232, 0.14);
  --border-color: #2C3545;
  --border-light: #222938;
  --highlight-yellow: rgba(120, 166, 232, 0.28);
  --callout-teacher-bg: #1A1E29;
  --callout-teacher-border: #3A475F;
  --card-takeaway-bg: #13221C;
  --card-takeaway-border: #234D3D;
  --card-reflection-bg: #1A1C2C;
  --card-reflection-border: #3A4068;
  --card-practical-bg: #261B16;
  --card-practical-border: #5E3928;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.7);
}

/* Theme 5: Editorial White */
[data-theme="light"] {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F6F7F9;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --text-main: #14171A;
  --text-muted: #536471;
  --text-faint: #8B98A5;
  --accent: #2563EB;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --border-color: #E6E8EB;
  --border-light: #F2F4F6;
  --highlight-yellow: #FEF08A;
  --callout-teacher-bg: #F8FAFC;
  --callout-teacher-border: #CBD5E1;
  --card-takeaway-bg: #F0FDF4;
  --card-takeaway-border: #86EFAC;
  --card-reflection-bg: #EFF6FF;
  --card-reflection-border: #93C5FD;
  --card-practical-bg: #FFF7ED;
  --card-practical-border: #FDBA74;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.1);
}

/* Typography Choices */
[data-font="serif"] { --current-font: var(--font-serif); }
[data-font="sans"] { --current-font: var(--font-sans); }
[data-font="lora"] { --current-font: var(--font-lora); }
[data-font="atkinson"] { --current-font: var(--font-atkinson); }

/* Spacing Choices */
[data-line-height="compact"] { --line-height-val: 1.62; }
[data-line-height="comfortable"] { --line-height-val: 1.82; }
[data-line-height="spacious"] { --line-height-val: 2.08; }

/* Width Choices (Balanced reading measures) */
[data-width="narrow"] { --max-content-width: 580px; }
[data-width="standard"] { --max-content-width: 670px; }
[data-width="wide"] { --max-content-width: 780px; }

/* Justify text option */
[data-justify="true"] .book-content p {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}

/* --- 2. GLOBAL RESET & BASE --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--current-font);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* --- 3. READING PROGRESS BAR --- */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2.5px;
  z-index: 100;
  background: transparent;
  pointer-events: none;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #D49A5A);
  transition: width 0.1s ease-out;
}

/* --- 4. TOP READER HEADER --- */
.reader-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(var(--header-height) + var(--safe-top));
  padding-top: var(--safe-top);
  background: var(--bg-primary);
  background: rgba(var(--bg-primary), 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  z-index: 50;
  transform: translateY(0);
  transition: transform var(--transition-smooth), background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.reader-header.header-hidden {
  transform: translateY(-105%);
}

.header-content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  height: var(--header-height);
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.book-identity {
  display: flex;
  align-items: center;
  overflow: hidden;
}

.book-title {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover, .icon-btn:active {
  background: var(--bg-secondary);
  color: var(--text-main);
}

/* --- 5. LIVE REFRESH BANNER --- */
.live-banner {
  position: fixed;
  top: calc(var(--header-height) + var(--safe-top) + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--accent);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.live-banner.hidden {
  display: none;
}

.banner-reload-btn {
  background: var(--accent);
  color: #FFFFFF;
  border: none;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.banner-reload-btn:active {
  opacity: 0.8;
}

@keyframes slideDown {
  from { opacity: 0; transform: translate(-50%, -15px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* --- 6. MAIN VIEWPORT WITH COMFORTABLE SIDE MARGINS --- */
.reader-viewport {
  width: 100%;
  min-height: 100vh;
  padding-top: calc(var(--header-height) + var(--safe-top) + 20px);
  padding-bottom: calc(var(--safe-bottom) + 100px);
  /* Comfortable, generous book gutters on mobile and desktop */
  padding-left: clamp(24px, 6vw, 42px);
  padding-right: clamp(24px, 6vw, 42px);
}

.book-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
}

/* Dignified, Clean Book Hero (No messy badges or raw stats) */
.book-hero {
  text-align: center;
  padding: 42px 10px 48px;
  margin-bottom: 36px;
}

.hero-title {
  font-family: var(--current-font);
  font-size: clamp(2.1rem, 6vw, 3.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--text-main);
  margin-bottom: 12px;
}

.hero-author {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.3rem;
  opacity: 0.75;
}

.hero-divider span {
  display: inline-block;
  padding: 0 16px;
}

/* --- 7. TYPOGRAPHY & BOOK CONTENT --- */
.book-content {
  font-family: var(--current-font);
  font-size: var(--font-size);
  line-height: var(--line-height-val);
  color: var(--text-main);
}

.book-content p {
  margin-bottom: 1.65em;
  position: relative;
  letter-spacing: -0.003em;
}

/* Chapter Headings (H1) */
.book-content h1 {
  font-family: var(--current-font);
  font-size: clamp(1.8rem, 4.8vw, 2.45rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-top: 3.4em;
  margin-bottom: 1.2em;
  padding-top: 1.6em;
  border-top: 1px solid var(--border-color);
  color: var(--text-main);
  position: relative;
}

.book-content h1:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.chapter-badge-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 8px;
}

/* Part Headings (H2) */
.book-content h2 {
  font-family: var(--current-font);
  font-size: clamp(1.38rem, 3.6vw, 1.8rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-top: 2.5em;
  margin-bottom: 0.9em;
  color: var(--text-main);
  position: relative;
}

/* Section Headings (H3) */
.book-content h3 {
  font-family: var(--current-font);
  font-size: clamp(1.18rem, 2.8vw, 1.42rem);
  font-weight: 600;
  line-height: 1.35;
  margin-top: 2em;
  margin-bottom: 0.75em;
  color: var(--text-main);
}

/* Sub-headings (H4) */
.book-content h4 {
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  color: var(--text-main);
}

/* Emphasis & Strong */
.book-content strong {
  font-weight: 700;
  color: var(--text-main);
}

.book-content em {
  font-style: italic;
}

/* Drop Caps (Classic publishing style) */
[data-drop-caps="true"] .book-content .chapter-start-p::first-letter {
  float: left;
  font-family: var(--font-serif);
  font-size: 3.3em;
  line-height: 0.82;
  padding-top: 4px;
  padding-right: 12px;
  padding-bottom: 2px;
  color: var(--accent);
  font-weight: 700;
}

/* Horizontal Dividers */
.book-content hr {
  border: none;
  height: auto;
  text-align: center;
  margin: 3.2em auto;
  overflow: visible;
  position: relative;
}

.book-content hr::before {
  content: "— ❦ —";
  display: inline-block;
  color: var(--text-faint);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  opacity: 0.55;
}

/* Lists */
.book-content ul, .book-content ol {
  margin-bottom: 1.65em;
  padding-left: 1.5em;
}

.book-content li {
  margin-bottom: 0.65em;
  line-height: var(--line-height-val);
}

.book-content li::marker {
  color: var(--accent);
}

/* Blockquotes (Clean, high editorial quotes) */
.book-content blockquote {
  position: relative;
  margin: 2em 0;
  padding: 16px 20px 16px 24px;
  background: var(--bg-secondary);
  background: rgba(var(--bg-secondary), 0.6);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.book-content blockquote p {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.04em;
  line-height: 1.68;
  margin-bottom: 0;
  color: var(--text-main);
}

/* --- 8. SMART CALLOUT CARDS --- */
/* Master Teacher Breakdown Card */
.callout-teacher {
  margin: 2.2em 0;
  background: var(--callout-teacher-bg);
  border: 1px solid var(--callout-teacher-border);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.callout-teacher-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.callout-teacher-title {
  font-family: var(--font-sans);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.35;
}

.teacher-step-row {
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--border-light);
  line-height: 1.65;
}

.teacher-step-row:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.step-pill {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 6px;
  margin-right: 6px;
  vertical-align: middle;
}

.step-pill.step-a { background: #E0E7FF; color: #3730A3; }
.step-pill.step-b { background: #DCFCE7; color: #166534; }
.step-pill.step-c { background: #F3E8FF; color: #6B21A8; }
.step-pill.step-d { background: #FEF3C7; color: #92400E; }
.step-pill.step-e { background: #FCE7F3; color: #9D174D; }

[data-theme="night"] .step-pill.step-a { background: #1E293B; color: #93C5FD; }
[data-theme="night"] .step-pill.step-b { background: #064E3B; color: #6EE7B7; }
[data-theme="night"] .step-pill.step-c { background: #3B0764; color: #D8B4FE; }
[data-theme="night"] .step-pill.step-d { background: #451A03; color: #FCD34D; }
[data-theme="night"] .step-pill.step-e { background: #500724; color: #F9A8D4; }

/* Study Cards: Key Takeaways, Think About This, Practical Application */
.study-card {
  margin: 2.2em 0;
  border-radius: var(--radius-md);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.study-card.takeaways {
  background: var(--card-takeaway-bg);
  border-color: var(--card-takeaway-border);
}

.study-card.reflection {
  background: var(--card-reflection-bg);
  border-color: var(--card-reflection-border);
}

.study-card.practical {
  background: var(--card-practical-bg);
  border-color: var(--card-practical-border);
}

.study-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.study-card ul, .study-card ol {
  margin-bottom: 0;
  padding-left: 1.3em;
}

/* Responsive Book Tables */
.table-wrapper {
  margin: 2.2em 0;
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.55;
  text-align: left;
}

th, td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
}

th {
  background: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

tr:nth-child(even) td {
  background: rgba(var(--bg-secondary), 0.35);
}

/* Highlights */
mark.user-highlight {
  background-color: var(--highlight-yellow);
  color: inherit;
  padding: 2px 4px;
  border-radius: 4px;
  cursor: pointer;
}

/* --- 9. BOTTOM DOCK & FLOATING CONTROLS --- */
.bottom-dock {
  position: fixed;
  bottom: calc(var(--safe-bottom) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: var(--bg-surface-elevated);
  background: rgba(var(--bg-surface-elevated), 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  border-radius: 999px;
  padding: 6px 14px;
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 40;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
}

.bottom-dock.dock-hidden {
  transform: translateX(-50%) translateY(140%);
  opacity: 0;
  pointer-events: none;
}

.dock-arrow {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dock-arrow:active {
  background: var(--bg-secondary);
  color: var(--accent);
}

.dock-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.dock-divider {
  opacity: 0.4;
}

/* --- 10. DRAWERS (TOC & SETTINGS) --- */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 80;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}

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

.drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  width: min(86vw, 360px);
  background: var(--bg-surface);
  z-index: 90;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-smooth);
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

.drawer-left {
  left: 0;
  transform: translateX(-102%);
}

.drawer-left.active {
  transform: translateX(0);
}

.drawer-right {
  right: 0;
  transform: translateX(102%);
}

.drawer-right.active {
  transform: translateX(0);
}

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

.drawer-header h2 {
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
}

.close-btn {
  background: var(--bg-secondary);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  cursor: pointer;
}

.close-btn:active {
  color: var(--text-main);
}

.drawer-search-box {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-light);
}

.drawer-search-box input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-main);
  outline: none;
}

.drawer-search-box input:focus {
  border-color: var(--accent);
}

.toc-navigation {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  -webkit-overflow-scrolling: touch;
}

.toc-item {
  display: block;
  padding: 8px 12px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.4;
  transition: all var(--transition-fast);
}

.toc-item.level-1 {
  font-weight: 700;
  color: var(--text-main);
  font-size: 0.92rem;
  margin-top: 14px;
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-secondary);
}

.toc-item.level-2 {
  font-weight: 600;
  padding-left: 18px;
  color: var(--text-main);
}

.toc-item.level-3 {
  font-weight: 400;
  padding-left: 28px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.toc-item:active, .toc-item.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.drawer-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-faint);
}

.text-link {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.text-link.danger {
  color: #EF4444;
}

/* Settings Drawer Body */
.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 18px 20px;
  -webkit-overflow-scrolling: touch;
}

.pref-group {
  margin-bottom: 22px;
}

.pref-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 12px;
}

.pref-label-split {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.pref-val-badge {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 6px;
}

/* Theme Picker */
.theme-picker {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.theme-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-chip.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.chip-preview {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.12);
}

.theme-paper .chip-preview { background: #FAF7F2; }
.theme-sepia .chip-preview { background: #F4ECD8; }
.theme-night .chip-preview { background: #000000; }
.theme-slate .chip-preview { background: #13161C; }
.theme-light .chip-preview { background: #FFFFFF; }

.chip-name {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Font Picker */
.font-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.font-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.font-chip.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.font-sample {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
}

.font-sample.serif { font-family: var(--font-serif); }
.font-sample.sans { font-family: var(--font-sans); }
.font-sample.lora { font-family: var(--font-lora); }
.font-sample.atkinson { font-family: var(--font-atkinson); }

.font-name {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Slider Row */
.slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.size-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Segmented Control */
.segmented-control {
  display: flex;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--border-color);
}

.segment-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 6px 0;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.segment-btn.active {
  background: var(--bg-surface);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Toggles */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-main);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider.round {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--border-color);
  transition: 0.25s;
  border-radius: 34px;
}

.slider.round:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.25s;
  border-radius: 50%;
}

input:checked + .slider.round {
  background-color: var(--accent);
}

input:checked + .slider.round:before {
  transform: translateX(20px);
}

.settings-reset-box {
  padding-top: 10px;
  text-align: center;
}

/* --- 11. SEARCH & BOOKMARK MODALS --- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 95;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.52);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-card {
  position: relative;
  width: min(94vw, 520px);
  max-height: 80vh;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 2;
  animation: modalScale 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header-row {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}

.modal-header-row h3 {
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
}

.search-input-wrap input {
  flex: 1;
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
}

.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 14px 18px;
  max-height: 55vh;
  -webkit-overflow-scrolling: touch;
}

.search-empty {
  text-align: center;
  padding: 40px 10px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.search-result-item {
  display: block;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  margin-bottom: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-result-item:hover, .search-result-item:active {
  background: var(--accent-soft);
}

.search-res-title {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.search-res-snippet {
  font-family: var(--current-font);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.search-res-snippet mark {
  background: var(--highlight-yellow);
  font-weight: 700;
  padding: 0 2px;
  border-radius: 2px;
}

/* Bookmarks list */
.bookmarks-list {
  padding: 14px 18px;
  max-height: 55vh;
  overflow-y: auto;
}

.bookmark-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  margin-bottom: 8px;
  cursor: pointer;
}

.bookmark-title {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-main);
}

.btn-delete-bm {
  background: none;
  border: none;
  color: var(--text-faint);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 4px;
}

.btn-delete-bm:hover {
  color: #EF4444;
}

/* --- 12. SELECTION POPUP TOOLBAR --- */
.selection-toolbar {
  position: absolute;
  z-index: 70;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  border-radius: 999px;
  padding: 4px 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  transform: translateX(-50%) translateY(-110%);
  animation: fadeIn 0.15s ease-out;
}

.selection-toolbar.hidden {
  display: none;
}

.sel-btn {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
}

.sel-btn:active {
  background: var(--bg-secondary);
  color: var(--accent);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-90%); }
  to { opacity: 1; transform: translateX(-50%) translateY(-110%); }
}

/* --- 13. TOAST NOTIFICATION --- */
.toast {
  position: fixed;
  bottom: calc(var(--safe-bottom) + 80px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(20, 20, 22, 0.92);
  color: #FFFFFF;
  padding: 8px 18px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  z-index: 100;
  pointer-events: none;
  animation: toastFade 0.25s ease-out;
}

.toast.hidden {
  display: none;
}

@keyframes toastFade {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* --- 14. BOOK FOOTER & ACTIONS --- */
.book-end-footer {
  text-align: center;
  padding: 50px 10px 40px;
  border-top: 1px solid var(--border-light);
  margin-top: 50px;
}

.end-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 20px 0 6px;
}

.end-sub {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-bottom: 24px;
}

.end-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.btn-primary, .btn-secondary {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 9px 20px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--accent);
  color: #FFFFFF;
  border: 1px solid var(--accent);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-primary:active, .btn-secondary:active {
  transform: scale(0.97);
}

/* Loading State */
.loading-state {
  text-align: center;
  padding: 100px 20px;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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