@import url('https://fonts.cdnfonts.com/css/opendyslexic');

:root {
  --bg-primary: #f0f2f5;
  --bg-secondary: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #65676b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --border: #e4e6eb;
  --shadow: rgba(0, 0, 0, 0.08);
  --reader-bg: #ffffff;
  --reader-text: #1c1e21;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --reader-text-align: left;
  --reader-font-size: 18px;
  --reader-line-height: 1.8;
  --page-gap: 120px;
  --reader-font-family: Georgia, "Times New Roman", serif;
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
}

/* Respect system dark mode preference */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --border: #3a3b3c;
    --shadow: rgba(0, 0, 0, 0.4);
    --reader-bg: #18191a;
    --reader-text: #e4e6eb;
    --glass-bg: rgba(26, 26, 26, 0.7);
    --glass-border: rgba(58, 59, 60, 0.3);
  }
}

[data-theme="sepia"] {
  --bg-primary: #f4f1ea;
  --bg-secondary: #faf8f3;
  --text-primary: #3c3022;
  --text-secondary: #7a6f5d;
  --reader-bg: #f9f6ed;
  --reader-text: #3c3022;
  --glass-bg: rgba(250, 248, 243, 0.7);
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --text-primary: #e4e6eb;
  --text-secondary: #b0b3b8;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --border: #3a3b3c;
  --shadow: rgba(0, 0, 0, 0.4);
  --reader-bg: #18191a;
  --reader-text: #e4e6eb;
  --glass-bg: rgba(26, 26, 26, 0.7);
  --glass-border: rgba(58, 59, 60, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
  background: var(--reader-bg);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
}

body.reader-page {
  overflow: hidden;
  overscroll-behavior: none;
  scrollbar-width: none;
}

body.reader-page::-webkit-scrollbar {
  display: none;
}

.view { display: none; }
.view.active { display: block; }

/* Library */
#library-view { max-width: 1400px; margin: 0 auto; padding: 2rem; }

.app-header {
  text-align: center;
  padding: 3rem 1rem;
  margin-bottom: 2rem;
}

.app-header h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 750;
  letter-spacing: -0.03em;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.subtitle {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.auth-container {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.2);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  max-width: min(360px, 100%);
}

.user-photo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.2);
}

.user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
  transition: color 0.2s ease;
}

.btn-text:hover {
  color: var(--text-primary);
}

.library-container {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 2.5rem;
  border: 1px solid var(--glass-border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.import-section { text-align: center; padding: 2rem; margin-bottom: 2rem; }

.btn {
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-block;
  white-space: nowrap;
  line-height: 1.2;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.15);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  color: var(--text-primary);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  opacity: 0.85;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.25);
  opacity: 1;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.btn-icon {
  padding: 0.4rem;
  width: 36px;
  height: 36px;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.15);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  color: var(--text-primary);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  opacity: 0.85;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  position: relative;
  overflow: hidden;
  touch-action: manipulation;
}

.btn-icon:hover { 
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.22);
  opacity: 1;
  transform: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.icon { 
  font-size: 1.1rem;
  line-height: 1;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}

.book-card {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.book-card .delete-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 59, 48, 0.92);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  color: #fff;
  box-shadow: 0 4px 10px rgba(255, 59, 48, 0.25);
}

.book-card:hover .delete-btn {
  opacity: 1;
}

.book-card .delete-btn:hover {
  background: rgba(255, 59, 48, 1);
  transform: scale(1.05);
}

.book-cover { 
  font-size: 4rem; 
  text-align: center; 
  margin-bottom: 1rem; 
  opacity: 0.8;
  width: 100%;
  height: 240px; /* Increased from 160px */
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  position: relative;
}

.book-cover-placeholder {
  font-size: 4rem;
  opacity: 0.8;
}
.book-card .book-title { 
  font-size: 1.1rem; 
  font-weight: 600; 
  margin-bottom: 0.5rem; 
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
}
.book-author { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.book-progress { 
  margin-top: auto;
  padding-top: 0.5rem;
}

.progress-bar {
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  transition: width 0.3s ease;
}

.progress-text { 
  font-size: 0.75rem; 
  color: var(--text-secondary);
  text-align: center;
}

/* Reader */
#reader-view {
  min-height: 100vh;
  height: 100vh;
  height: 100dvh;
  position: relative;
  background: var(--page-paper-bg, var(--reader-bg));
  color: var(--page-paper-text, var(--reader-text));
  padding-bottom: var(--safe-area-bottom);
}

/* User Menu Dropdown */
.user-menu {
  display: none;
  position: absolute;
  top: 50px;
  right: 0;
  min-width: 250px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  padding: 0;
  z-index: 1100;
}

.user-menu.show {
  display: block;
}

.user-menu-header {
  padding: 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.user-menu-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.2rem;
}

.user-menu-info {
  flex: 1;
  min-width: 0;
}

.user-menu-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-menu-email {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-menu-divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

.user-menu-item {
  width: 100%;
  padding: 0.75rem 1rem;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.2s;
  touch-action: manipulation;
}

.user-menu-item:hover {
  background: rgba(var(--accent-rgb, 99, 102, 241), 0.1);
}

.user-menu-item .icon {
  font-size: 1rem;
}

.reader-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  height: 100%;
  min-height: 100%;
}

.chapter-sidebar {
  position: fixed;
  top: -100vh;
  left: 10px;
  width: 300px;
  max-height: 80vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transition: top 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  overflow-y: auto;
  padding: 1rem;
}

.chapter-sidebar.show {
  top: 60px;
}

.chapter-sidebar.hidden {
  top: -100vh;
}

.chapter-sidebar h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-weight: 600;
}

.chapter-list { display: flex; flex-direction: column; gap: 0.5rem; }

.chapter-item {
  padding: 0.875rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-primary);
}

.chapter-item:hover {
  background: var(--accent);
  color: white;
  transform: translateX(4px);
}

.chapter-item.active {
  background: var(--accent);
  color: white;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.chapter-number {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}

.chapter-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.chapter-title {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-mood {
  font-size: 0.7rem;
  opacity: 0.8;
  font-weight: 400;
  text-transform: capitalize;
}

.chapter-item:hover .chapter-mood,
.chapter-item.active .chapter-mood {
  opacity: 1;
}

.reader-content {
  flex: 1;
  overflow: hidden !important; /* Force hide all scrollbars */
  padding: 0; /* Remove padding for full-height background */
  background: var(--page-paper-bg, var(--reader-bg));
  color: var(--page-paper-text, var(--reader-text));
  display: flex;
  justify-content: center;
  align-items: stretch; /* Changed from center to stretch for full height */
  position: relative;
  height: 100%; /* Ensure full height */
}

/* Page flip container */
.page-container {
  width: 100%;
  height: 100%;
  min-height: 100%;
  position: relative;
  overflow: visible; /* Allow overflow for tall pages */
  display: flex;
  align-items: stretch;
  /* Perspective handled by .page-viewport */
}

/* Page indicator overlay (bottom-center) - button-like style */
.page-indicator {
  position: absolute;
  bottom: calc(15px + var(--safe-area-bottom));
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 0.75rem;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.15);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  color: var(--text-primary);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  pointer-events: none;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  opacity: 0.9;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  align-items: center;
  text-align: center;
  white-space: nowrap;
  max-width: calc(100vw - 40px);
}

/* Clickable indicators inside page indicator */
.clickable-indicator {
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
  pointer-events: auto;
  transition: all 0.2s ease;
  padding: 2px 4px;
  border-radius: 4px;
}

.clickable-indicator:hover {
  background: rgba(var(--accent-rgb, 59, 130, 246), 0.2);
  text-decoration-style: solid;
}

.clickable-indicator:active {
  transform: scale(0.98);
  background: rgba(var(--accent-rgb, 59, 130, 246), 0.3);
}

.page-viewport {
  position: relative;
  width: 100%; /* Always use full width */
  max-width: calc(100% - 160px); /* Leave space for nav buttons */
  height: 100%;
  min-height: 100%;
  overflow: hidden; /* No scrollbar - pages should fit */
  background: var(--page-paper-bg, var(--reader-bg));
  color: var(--page-paper-text, var(--reader-text));
  border-radius: 0;
  padding: var(--page-gap, 120px) 0; /* Top and bottom padding for gaps */
  box-sizing: border-box;
  transform-style: preserve-3d;
  /* Perspective based on viewport width */
  perspective: calc(100vw * 4);
  perspective-origin: center center;
}

/* Hide scrollbar during flip animations to prevent visual glitches */
.page-viewport:has(.chapter-text.flipping-next),
.page-viewport:has(.chapter-text.flipping-prev) {
  overflow-y: hidden;
  scrollbar-width: none;
}

.page-viewport:has(.chapter-text.flipping-next)::-webkit-scrollbar,
.page-viewport:has(.chapter-text.flipping-prev)::-webkit-scrollbar {
  display: none;
}

/* Show minimal scrollbar for long pages */
.page-viewport::-webkit-scrollbar {
  width: 8px;
}

.page-viewport::-webkit-scrollbar-track {
  background: transparent;
}

.page-viewport::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

.page-viewport::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* Page flip animations - Include horizontal centering offset */
@keyframes pageFlipNext {
  0% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0) rotateY(90deg);
    opacity: 1;
    z-index: 20;
    box-shadow: 20px 0 40px rgba(0, 0, 0, 0.4);
  }
  99% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0) rotateY(0deg);
    opacity: 1;
    z-index: 20;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.15);
  }
  100% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0);
    opacity: 1;
    z-index: 1;
    box-shadow: none;
  }
}

@keyframes pageFlipPrev {
  0% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0) rotateY(-90deg);
    opacity: 1;
    z-index: 20;
    box-shadow: -20px 0 40px rgba(0, 0, 0, 0.4);
  }
  99% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0) rotateY(0deg);
    opacity: 1;
    z-index: 20;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.15);
  }
  100% {
    transform: translate3d(var(--text-center-offset, 0px), 0, 0);
    opacity: 1;
    z-index: 1;
    box-shadow: none;
  }
}

.chapter-text {
  /* Use absolute positioning for both static and flipping pages to prevent layout shift */
  position: absolute;
  top: calc(var(--page-gap, 120px) + var(--safe-area-top)); /* Account for top inset/notch */
  left: 0; /* Align to left edge - no margin */
  bottom: calc(var(--page-gap, 120px) + var(--safe-area-bottom)); /* Account for curved bottom insets */
  width: 100%; /* Full width */
  margin: 0;
  padding: 48px 0 96px 0; /* Only top and bottom padding */
  font-size: var(--reader-font-size, 18px);
  line-height: var(--reader-line-height, 1.8);
  font-family: var(--reader-font-family, Georgia, "Times New Roman", serif);
  color: inherit;
  background: var(--page-paper-bg, var(--reader-bg));
  overflow: visible;
  height: auto;
  min-height: calc(100% - (var(--page-gap, 120px) * 2) - var(--safe-area-top) - var(--safe-area-bottom));
  box-sizing: border-box; /* Include padding in width */
  /* Force BOTH pages onto GPU layer for consistent rendering */
  /* Dynamic horizontal centering based on text width percentage */
  transform: translate3d(var(--text-center-offset, 0px), 0, 0);
  backface-visibility: hidden;
  /* Consistent text rendering */
  text-align: left;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Disable text size adjustment */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Ensure text is always visible and properly aligned */
.chapter-text p,
.chapter-text h1,
.chapter-text h2,
.chapter-text h3,
.chapter-text h4,
.chapter-text h5,
.chapter-text h6,
.chapter-text div,
.chapter-text span {
  color: inherit;
  opacity: 1 !important;
  visibility: visible !important;
  /* Use the text-align setting from CSS variable */
  text-align: var(--reader-text-align, left) !important;
  word-spacing: normal;
  letter-spacing: normal;
  text-indent: 0;
}

/* Hide scrollbar during flip animations */
.page-viewport.flipping {
  overflow-y: hidden !important;
}

/* Pre-render class - used to calculate layout before animation */
.chapter-text.pre-render {
  opacity: 0 !important;
  pointer-events: none;
}

/* Apply animations based on flip direction */
/* Flipping pages inherit all positioning from .chapter-text, just add animation and shadow */
.chapter-text.flipping-next,
.chapter-text.flipping-prev {
  z-index: 20; /* Ensure flipping page is on top */
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.15);
  transform-style: preserve-3d;
  backface-visibility: visible;
}

.chapter-text.flipping-next {
  animation: pageFlipNext 0.7s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
  transform-origin: right center;
}

.chapter-text.flipping-prev {
  animation: pageFlipPrev 0.7s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
  transform-origin: left center;
}

.reader-controls {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none; /* Allow clicking through to content */
  z-index: 50; /* Above content */
}

.reader-controls > * {
  pointer-events: all; /* Buttons are clickable */
}

/* Mobile tap-to-hide controls (both iOS and Android) */
.mobile-controls-hidden {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* Desktop fullscreen mode - hide by default, show on hover */
.desktop-fullscreen-mode {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.desktop-fullscreen-mode:hover {
  opacity: 1;
  pointer-events: auto;
}

/* Top-left controls */
.top-left-controls {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  z-index: 100; /* Overlay chapter sidebar (z-index: 40) */
}

/* Top-right controls */
.top-right-controls {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  z-index: 100; /* Match top-left controls */
}

.reader-controls #prev-chapter {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.15);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  opacity: 0.85;
  transition: all 0.3s ease;
}

.reader-controls #next-chapter {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.15);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(var(--border-rgb, 0, 0, 0), 0.1);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  opacity: 0.85;
  transition: all 0.3s ease;
}

.reader-controls #prev-chapter:hover,
.reader-controls #next-chapter:hover {
  background: rgba(var(--glass-rgb, 255, 255, 255), 0.25);
  opacity: 1;
  transform: translateY(-50%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.reader-controls #prev-chapter:disabled,
.reader-controls #next-chapter:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.page-indicator .indicator-line {
  display: block;
  line-height: 1.4;
  font-size: 0.8rem;
}

.page-indicator .indicator-line:not(:last-child) {
  margin-bottom: 0.15rem;
}

/* Panels - Compact and solid (NO transparency) */
.music-panel, .settings-panel, .music-settings-panel {
  position: fixed;
  top: -100vh;
  right: 10px;
  width: 650px;
  max-height: 80vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transition: top 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  opacity: 1;
  visibility: hidden;
  pointer-events: none;
}

.music-panel.show { top: 60px; }
.settings-panel.show { top: 60px; }
.music-settings-panel.show { top: 60px; }

.music-panel.show,
.settings-panel.show,
.music-settings-panel.show {
  visibility: visible;
  pointer-events: auto;
}

.music-panel { display: flex; flex-direction: column; }
.settings-panel { 
  overflow-y: auto; 
  padding: 0; 
}
.music-settings-panel {
  overflow-y: auto;
  padding: 0;
}

/* Settings panel content - more compact */
.settings-content {
  padding: 0.5rem 0.75rem; /* Even more compact */
}

.settings-two-column {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.settings-column {
  flex: 1;
  min-width: 0;
}

.settings-section-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
}


.music-header, .settings-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.music-header {
  flex-direction: column;
  gap: 0.35rem;
}

.settings-header {
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 1;
}
.music-header h3, .settings-header h3 { font-size: 1rem; font-weight: 600; margin: 0; }

.playback-source-status {
  max-width: 100%;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.72rem;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
  background: rgba(127, 127, 127, 0.12);
}

.playback-source-status.status-ready {
  color: #176437;
  border-color: rgba(34, 156, 85, 0.45);
  background: rgba(34, 156, 85, 0.12);
}

.playback-source-status.status-info {
  color: var(--text-secondary);
}

.playback-source-status.status-warning {
  color: #8a5a00;
  border-color: rgba(193, 126, 0, 0.45);
  background: rgba(193, 126, 0, 0.14);
}

.playback-source-status.status-error {
  color: #9b1c1c;
  border-color: rgba(181, 45, 45, 0.5);
  background: rgba(181, 45, 45, 0.14);
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0.25rem;
  line-height: 1;
  transition: color 0.2s;
}

.btn-close:hover { color: var(--text-primary); }

.music-info {
  padding: 1rem 1rem; /* More compact: reduced from 2rem 1.5rem */
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary); /* Ensure solid */
}

.track-info { margin-bottom: 1.5rem; }
.track-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; }
.track-artist { font-size: 0.9rem; color: var(--text-secondary); }

.next-shift-info {
  margin-top: 0.75rem;
  padding: 0.6rem 0.85rem;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  border-radius: 6px;
  animation: fadeIn 0.3s ease;
  font-size: 0.85rem;
}

.shift-indicator {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: white;
}

.shift-icon {
  font-size: 1.25rem;
  animation: pulse 2s ease-in-out infinite;
}

.shift-text {
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.4;
}

.shift-text small {
  opacity: 0.85;
  font-size: 0.8rem;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.music-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1rem; /* Even more compact */
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.music-controls-inline {
  justify-content: flex-start;
  padding: 0;
  border-bottom: none;
  background: transparent;
}

.btn-large { font-size: 1.9rem; padding: 0.85rem; } /* Larger play/pause */

/* Inline volume control (next to playback buttons) */
.volume-control-inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.75rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
}

.volume-control-inline .icon {
  font-size: 0.95rem;
  opacity: 0.7;
}

.volume-control-inline #volume-slider {
  width: 90px; /* Slightly narrower */
  height: 4px;
  border-radius: 2px;
  background: var(--bg-primary);
  outline: none;
  appearance: none;
}

.volume-control-inline #volume-slider::-webkit-slider-thumb {
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.volume-control-inline #volume-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.volume-control-inline #volume-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease;
}

.volume-control-inline #volume-slider::-moz-range-thumb:hover {
  transform: scale(1.2);
}

.volume-control-inline #volume-value {
  min-width: 2.75rem;
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Old volume control (keep for backward compatibility but hide) */
.volume-control {
  display: none;
}

.music-playlist-header {
  padding: 1.5rem 1.5rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.music-playlist-header h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin: 0;
}

.music-controls-inline {
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.playlist {
  flex: 1;
  padding: 0 1.5rem 1.5rem;
  overflow-y: auto;
}

.playlist-tracks { 
  display: flex; 
  flex-direction: column; 
  gap: 0.25rem; /* Even more compact */
}

.playlist-item {
  padding: 0.6rem 0.75rem; /* Slightly larger for status */
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--bg-secondary);
  font-size: 0.8rem; /* Smaller text */
  position: relative;
  border: 1px solid transparent;
}

.playlist-item:hover {
  background: var(--accent);
  color: white;
  transform: translateX(3px);
}

.playlist-item.active { 
  background: var(--accent); 
  color: white;
  font-weight: 500;
  border-color: rgba(255, 255, 255, 0.2);
}

.playlist-item.playing {
  background: var(--accent);
  color: white;
  animation: pulse 2s ease-in-out infinite;
}

.playlist-item.played {
  opacity: 0.6;
}

/* Shift point indicator - more prominent */
.playlist-item.shift-point {
  border-left: 4px solid var(--accent);
  padding-left: calc(0.6rem - 4px);
  background: linear-gradient(to right, rgba(var(--accent-rgb, 99, 102, 241), 0.1), var(--bg-secondary));
}

.playlist-item.shift-point:hover {
  background: var(--accent);
}

.playlist-item.shift-point::after {
  content: '⚡';
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  opacity: 0.6;
}

.playlist-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: inherit;
  opacity: 0.65;
}

.playlist-status-icon {
  font-size: 0.75rem;
}

.playlist-item.is-playing .playlist-status {
  opacity: 0.9;
}

.playlist-item.active.shift-point::after {
  opacity: 1;
}

.track-play-info {
  font-size: 0.65rem; /* Even smaller */
  opacity: 0.65;
  font-weight: 400;
  margin-top: 0.15rem;
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.track-play-info::before {
  content: '📍';
  font-size: 0.7rem;
}

.setting-group { margin-bottom: 1rem; } /* Reduced spacing */

.setting-group h3 {
  font-size: 0.9rem; /* Smaller */
  font-weight: 600;
  color: var(--text-primary);
  margin: 1rem 0 0.5rem 0; /* Reduced margins */
}

.setting-group label {
  display: block;
  font-size: 0.85rem; /* Smaller */
  font-weight: 500;
  margin-bottom: 0.5rem; /* Reduced */
}

.setting-group select,
.setting-group input[type="range"],
.setting-group input[type="text"] {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.setting-group input[type="range"] {
  padding: 0;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  outline: none;
  border-radius: 3px;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s;
}

.setting-group input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
  transform: scale(1.1);
}

.setting-group input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.setting-group input[type="range"]::-moz-range-thumb:hover {
  background: var(--accent-hover);
  transform: scale(1.1);
}

.setting-group span {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.setting-group input[type="checkbox"] {
  margin-right: 0.5rem;
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--accent);
}

.setting-group label:has(input[type="checkbox"]) {
  display: flex;
  align-items: center;
  cursor: pointer;
}

/* Loading & Toast */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.loading-overlay.hidden { display: none; }

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

#loading-message {
  color: white;
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  padding: 1rem 1.5rem;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transform: translateX(100%);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

.toast-success { border-left: 4px solid #10b981; }
.toast-error { border-left: 4px solid #ef4444; }
.toast-info { border-left: 4px solid #3b82f6; }

/* Fullscreen mode */
/* Ensure fullscreen uses the same paper color everywhere (no body gradient bleeding through) */
:fullscreen,
:fullscreen body,
:fullscreen #reader-view {
  background: var(--page-paper-bg, var(--reader-bg));
}

:-webkit-full-screen,
:-webkit-full-screen body,
:-webkit-full-screen #reader-view {
  background: var(--page-paper-bg, var(--reader-bg));
}

/* Footer controls are hidden in fullscreen and revealed on hover */
/* Desktop fullscreen - auto-hide with hover */
@media (min-width: 769px) {
  :fullscreen .reader-controls,
  :-webkit-full-screen .reader-controls {
    position: fixed;
    left: 0;
    right: 0;
    z-index: 1999;
    opacity: 0 !important; /* Important to override any classes */
    pointer-events: none !important;
    transition: opacity 180ms ease, transform 180ms ease;
  }

  :fullscreen .reader-controls,
  :-webkit-full-screen .reader-controls {
    bottom: 0;
    transform: translateY(8px);
  }

  :fullscreen .reader-controls:hover,
  :-webkit-full-screen .reader-controls:hover {
    opacity: 1 !important; /* Important to ensure controls show on hover */
    transform: translateY(0);
    pointer-events: auto !important;
  }
}

/* Chapter sidebar in fullscreen */
:fullscreen .chapter-sidebar {
  position: fixed;
  left: -280px;
  z-index: 999;
  transition: left 0.3s;
  height: 100dvh;
  min-height: 100vh;
}

:-webkit-full-screen .chapter-sidebar {
  position: fixed;
  left: -280px;
  z-index: 999;
  transition: left 0.3s;
  height: 100dvh;
  min-height: 100vh;
}

:fullscreen .chapter-sidebar:hover,
:fullscreen .chapter-sidebar.show {
  left: 0;
}

:-webkit-full-screen .chapter-sidebar:hover,
:-webkit-full-screen .chapter-sidebar.show {
  left: 0;
}

/* Hide page indicator (display options) in fullscreen mode - all devices */
/* Use higher specificity to ensure it overrides */
html:fullscreen .page-indicator,
html:-webkit-full-screen .page-indicator,
html:-moz-full-screen .page-indicator,
html:-ms-fullscreen .page-indicator,
:root:fullscreen .page-indicator,
:root:-webkit-full-screen .page-indicator {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

/* Also hide on iOS fullscreen (standalone mode - added to home screen) */
@media all and (display-mode: standalone) {
  .page-indicator {
    display: none !important;
  }
}

/* Maximize screen usage in fullscreen mode */
:fullscreen,
:-webkit-full-screen {
  --page-gap: 20px; /* Reduce gap from 120px to 20px in fullscreen */
}

:fullscreen .page-container,
:-webkit-full-screen .page-container {
  height: 100dvh !important; /* Use dynamic viewport height */
  min-height: 100vh !important;
} 

:fullscreen .chapter-text,
:-webkit-full-screen .chapter-text {
  padding: 0px 0 0px 0 !important; /* Only vertical padding */
  height: auto !important; /* Let content determine height */
  min-height: calc(100vh - 88px) !important;
  min-height: calc(100dvh - 88px - var(--safe-area-top) - var(--safe-area-bottom)) !important;
}

/* Mobile fullscreen - controls hidden by default, tap center to toggle */
@media (max-width: 768px) {
  :fullscreen .reader-controls,
  :-webkit-full-screen .reader-controls {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  :fullscreen .reader-controls,
  :-webkit-full-screen .reader-controls {
    transform: translateY(100%);
  }

  /* Show controls briefly when tapping near them */
  :fullscreen .reader-controls:active,
  :-webkit-full-screen .reader-controls:active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  /* Disable hover effects on mobile */
  @media (hover: none) {
    :fullscreen .reader-controls:hover,
    :-webkit-full-screen .reader-controls:hover {
      opacity: 0;
      transform: translateY(100%);
      pointer-events: none;
    }
  }
}

/* Desktop: Ensure buttons have proper size and spacing */
@media (min-width: 769px) {
  .top-left-controls,
  .top-right-controls {
    gap: 0.5rem;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .chapter-sidebar {
    width: calc(100% - 20px);
    max-width: 300px;
    left: 10px;
    top: -100vh;
    border-radius: 12px;
    max-height: 80vh;
  }

  .chapter-sidebar.show {
    top: 60px;
  }

  .chapter-sidebar.hidden {
    top: -100vh;
  }
  
  .reader-content { padding: 1.5rem; }
  .app-header h1 { font-size: 2.5rem; }
  
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
  }

  /* Ensure top controls stay above chapter sidebar and fit on mobile */
  .top-left-controls,
  .top-right-controls {
    z-index: 110 !important;
    position: absolute;
    top: 0.75rem;
  }

  .top-left-controls { left: 0.75rem; }
  .top-right-controls { right: 0.75rem; }

  /* Hide fullscreen button on mobile */
  #fullscreen-btn {
    display: none !important;
  }

  /* Controls */
  .controls {
    gap: 8px;
  }

  .controls button {
    min-height: 44px;
    padding: 10px 16px;
    font-size: 0.9rem;
  }

  .reader-controls .btn-icon {
    width: 44px;
    height: 44px;
  }

  .reader-controls #prev-chapter,
  .reader-controls #next-chapter {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
  }

  /* Reader container */
  .reader-container {
    padding: 0;
  }

  .reader-content {
    padding: 0;
  }

  /* Chapter text - use percentage-based padding for better mobile space usage */
  .chapter-text {
    /* Use full vertical space on mobile; keep only horizontal breathing room */
    padding: 0 3%;
    font-size: var(--reader-font-size, 16px);
    top: calc(3vh + var(--safe-area-top));
    top: calc(3dvh + var(--safe-area-top));
    bottom: calc(3vh + var(--safe-area-bottom));
    bottom: calc(3dvh + var(--safe-area-bottom));
  }

  /* Reduce page gaps on mobile to maximize text area */
  .page-viewport {
    max-width: 100%;
    translate: 10px 0px;
    padding: 0;
  }

  /* Fullscreen mode - maximize space for text */
  :fullscreen .chapter-text,
  :-webkit-full-screen .chapter-text {
    top: calc(2vh + var(--safe-area-top));
    top: calc(2dvh + var(--safe-area-top));
    bottom: calc(2vh + var(--safe-area-bottom));
    bottom: calc(2dvh + var(--safe-area-bottom));
  }

  /* Page indicator - more compact on mobile, fully visible */
  .page-indicator {
    bottom: calc(10px + var(--safe-area-bottom));
    padding: 0.4rem 0.6rem;
    font-size: 0.7rem;
    gap: 0.2rem;
    max-width: calc(100vw - 20px);
  }

  .page-indicator .indicator-line {
    font-size: 0.7rem;
    line-height: 1.3;
  }

  .page-indicator .indicator-line:not(:last-child) {
    margin-bottom: 0.1rem;
  }

  /* Settings panel - dropdown style on mobile */
  .settings-panel {
    width: calc(100% - 20px);
    max-width: 500px;
    right: 10px;
    left: auto;
    top: -100vh;
    border-radius: 12px;
    max-height: 85vh;
  }

  .settings-panel.show {
    top: 60px;
  }

  .settings-header {
    padding: 12px;
  }

  .settings-header h3 {
    font-size: 1.2rem;
  }

  .settings-content {
    padding: 12px 14px 16px;
  }

  .setting-group {
    margin-bottom: 1rem;
  }

  .setting-group label {
    font-size: 0.95rem;
  }

  .setting-group input[type="range"] {
    height: 24px;
    touch-action: pan-x;
  }

  .setting-group input[type="range"]::-webkit-slider-thumb {
    width: 16px;
    height: 16px;
  }

  .setting-group input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
  }

  .volume-control #volume-slider,
  .volume-control-inline #volume-slider {
    touch-action: pan-x;
  }

  .settings-two-column {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .settings-section-title {
    font-size: 0.95rem;
  }

  .music-playlist-header,
  .music-controls-inline,
  .playlist {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  /* Music panel - dropdown style on mobile */
  .music-panel,
  .music-settings-panel {
    width: calc(100% - 20px);
    max-width: 500px;
    max-height: 88vh;
    left: auto;
    right: 10px;
    top: -100vh;
    bottom: auto;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  }

  .music-panel.show,
  .music-settings-panel.show {
    top: 60px;
    transform: none;
  }

  .music-header {
    padding: 12px;
    border-radius: 12px 12px 0 0;
  }

  .music-header::before {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    margin: 0 auto 12px;
  }

  .music-header h3 {
    font-size: 1.2rem;
  }

  .playback-source-status {
    font-size: 0.68rem;
    max-width: 94%;
  }

  /* Make close buttons larger and better positioned on mobile */
  .btn-close {
    font-size: 2rem;
    padding: 8px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .playlist-item {
    padding: 14px 12px;
    font-size: 0.95rem;
  }

  .track-title {
    font-size: 0.95rem;
  }

  .track-artist {
    font-size: 0.8rem;
  }

  .track-duration {
    font-size: 0.8rem;
  }

  .volume-control {
    min-width: 80px;
  }

  /* Auth container */
  .auth-container {
    padding: 20px;
  }

  .auth-container button {
    min-height: 44px;
    font-size: 1rem;
  }

  .user-profile {
    width: 100%;
    justify-content: center;
  }

  .user-info {
    align-items: center;
  }

  .book-card {
    padding: 12px;
  }

  .book-cover {
    height: auto;
    aspect-ratio: 2 / 3;
  }

  .book-card .delete-btn {
    opacity: 1;
  }

  .book-title {
    font-size: 0.9rem;
  }

  .book-author {
    font-size: 0.8rem;
  }

  /* Toast notifications */
  .toast {
    left: 10px;
    right: 10px;
    width: auto;
  }
}

/* Small phones (375px and below) */
@media (max-width: 375px) {
  header h1 {
    font-size: 1.2rem;
  }

  .chapter-text {
    padding: 20px 15px 50px;
    font-size: var(--reader-font-size, 14px);
  }

  .controls button {
    padding: 8px 12px;
    font-size: 0.85rem;
  }

  .page-indicator {
    bottom: calc(8px + var(--safe-area-bottom));
    padding: 0.35rem 0.5rem;
    font-size: 0.65rem;
    gap: 0.15rem;
  }

  .page-indicator .indicator-line {
    font-size: 0.65rem;
    line-height: 1.2;
  }

  /* On very small screens, make indicator even more compact */
  @media (max-width: 360px) {
    .page-indicator {
      padding: 0.3rem 0.4rem;
      font-size: 0.6rem;
      gap: 0.1rem;
      bottom: calc(5px + var(--safe-area-bottom));
    }

    .page-indicator .indicator-line {
      font-size: 0.6rem;
      line-height: 1.2;
    }
  }

  .book-cover {
    height: 160px;
  }
}

/* Landscape orientation on phones */
@media (max-width: 768px) and (orientation: landscape) {
  .music-panel {
    height: 85vh;
    max-height: 85vh;
    bottom: -85vh;
  }

  .chapter-text {
    padding: 20px 30px 40px;
  }

  .page-viewport {
    --page-gap: 60px;
    padding-top: 60px;
    padding-bottom: 60px;
  }
}

/* ===== Additional Utility Classes (replaces inline styles) ===== */

/* Hidden elements - replaces style="display: none;" */
.hidden {
  display: none;
}

/* Music settings explanations */
.music-setting-explanation {
  display: block;
  margin-top: 0.5rem;
  opacity: 0.8;
  font-size: 0.8rem;
  line-height: 1.4;
}

/* Save button spacing */
.save-key-button {
  margin-top: 0.5rem;
}

/* Auto-detected keywords display */
.auto-detected-keywords {
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: rgba(var(--accent-rgb, 59, 130, 246), 0.1);
  border-radius: 8px;
  border-left: 3px solid var(--accent, #3b82f6);
}

.auto-detected-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.auto-detected-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.keyword-tag {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  background: var(--accent, #3b82f6);
  color: white;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.2;
}

/* Backup key status container */
.backup-key-status {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: rgba(34, 197, 94, 0.1);
  border-radius: 8px;
  border-left: 3px solid #22c55e;
}

.backup-key-status-text {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.backup-key-status-note {
  display: block;
  margin-top: 0.5rem;
  opacity: 0.8;
}

/* Freesound key help section */
.freesound-key-help {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.5;
}

.freesound-key-help-title {
  display: block;
  margin-bottom: 0.5rem;
}

.freesound-key-help ol {
  margin: 0;
  padding-left: 1.5rem;
}

.freesound-key-help li {
  margin-bottom: 0.25rem;
}


.freesound-key-help a {
  color: var(--accent);
  text-decoration: underline;
}

.freesound-key-help-note {
  display: block;
  margin-top: 0.5rem;
  opacity: 0.7;
}

/* iOS fullscreen tip */
.ios-fullscreen-tip {
  margin-top: 1.5rem;
  padding: 1rem;
   background: rgba(99, 102, 241, 0.1);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.ios-fullscreen-tip h4 {
  margin: 0 0 0.5rem 0;
  color: var(--accent);
  font-size: 0.95rem;
}

.ios-fullscreen-tip p {
  margin: 0 0 0.75rem 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

.ios-fullscreen-tip ol {
  margin: 0 0 0.75rem 0;
  padding-left: 1.5rem;
  font-size: 0.85rem;
  line-height: 1.6;
}

.ios-fullscreen-tip li {
  margin-bottom: 0.4rem;
}

.ios-fullscreen-tip .tip-note {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.8;
  font-style: italic;
}

/* Label hints and notes */
.label-hint {
  opacity: 0.7;
  font-size: 0.9em;
  font-weight: normal;
}

.setting-note {
  opacity: 0.8;
}

/* Layout Engine Page Styles */
.page-lines {
  /* Container for JS-controlled text layout */
  position: relative;
  width: 100%;
  height: 100%;
  /* Left-align content */
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  /* Remove all CSS that could affect text measurement */
  box-sizing: border-box;
  word-spacing: normal;
  letter-spacing: normal;
}

.page-lines p,
.page-lines h1,
.page-lines h2,
.page-lines h3,
.page-lines h4,
.page-lines h5,
.page-lines h6 {
  margin: 0;
  padding: 0;
  /* Disable ALL browser text wrapping - JS controls everything */
  white-space: nowrap;
  overflow: visible;
  word-wrap: normal;
  overflow-wrap: normal;
  hyphens: none;
  /* Ensure no CSS text properties interfere with JS measurements */
  word-spacing: normal;
  letter-spacing: normal;
  text-indent: 0;
  text-transform: none;
  /* Use text-align setting */
  text-align: var(--reader-text-align, left) !important;
}

.page-lines .h1 {
  font-size: 2em;
  font-weight: bold;
  margin: 0;
  padding: 0;
}

.page-lines .h2 {
  font-size: 1.5em;
  font-weight: bold;
  margin: 0;
  padding: 0;
}

.page-lines .h3 {
  font-size: 1.17em;
  font-weight: bold;
  margin: 0;
  padding: 0;
}

.page-lines .line-spacing {
  /* Match one real text line so pagination math and rendered spacing stay aligned */
  height: calc(var(--reader-font-size, 18px) * var(--reader-line-height, 1.8));
  flex: 0 0 auto;
}

/* Paragraphs - default book-style indent */
.page-lines p {
  margin: 0;
  padding: 0;
}

/* First paragraph after heading should not be indented */
.page-lines .h1 + .line-spacing + p,
.page-lines .h2 + .line-spacing + p,
.page-lines .h3 + .line-spacing + p,
.page-lines p.after-heading {
  text-indent: 0;
}

.page-lines .h1 + .line-spacing + p .text-line.first-line,
.page-lines .h2 + .line-spacing + p .text-line.first-line,
.page-lines .h3 + .line-spacing + p .text-line.first-line,
.page-lines p.after-heading .text-line.first-line {
  text-indent: 0 !important;
}

/* Text lines within paragraphs - each line is a span displayed as block */
.page-lines .text-line {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-indent: 0;
  /* No margins - spacing is controlled by parent paragraph */
}

/* ONLY the very first line of a paragraph gets indented (marked with first-line class) */
.page-lines p .text-line.first-line {
  text-indent: 2em;
}

/* All other lines have no indent (including continuation lines on new pages) */
.page-lines p .text-line:not(.first-line) {
  text-indent: 0;
}

/* Update Notification */
.update-notification {
  position: fixed;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  transition: top 0.3s ease-out;
  max-width: 500px;
  width: 90%;
}

.update-notification.show {
  top: 20px;
}

.update-notification.hiding {
  opacity: 0;
  transition: opacity 0.3s ease-out;
}

.update-notification-content {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: white;
  padding: 16px 20px;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
}

.update-icon {
  font-size: 24px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.update-message {
  flex: 1;
}

.update-reload-btn,
.update-dismiss-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.update-reload-btn {
  background: white;
  color: var(--accent);
}

.update-reload-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.update-dismiss-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: 8px 12px;
  font-size: 20px;
  line-height: 1;
}

.update-dismiss-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}