/* LITREAD Reader Styles & 3D Realistic Page-Turn Animation */

.reader-container {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background-color: var(--reader-bg, #1a1a1a);
  color: var(--reader-text, #f0f0f0);
  user-select: none;
  overflow: hidden;
  touch-action: pan-y;
  --reader-font-size: 18px;
  --reader-line-height: 1.6;
}

.reader-container.active {
  display: flex;
  flex-direction: column;
}

/* Reader Themes */
.reader-container[data-theme="paper"] {
  --reader-bg: #f7f5f0;
  --reader-page-bg: #fcfbf9;
  --reader-text: #2a2a2a;
  --reader-text-muted: #777777;
  --reader-border: #e6e3dc;
  --reader-hud-bg: rgba(247, 245, 240, 0.94);
  --reader-shadow: rgba(0, 0, 0, 0.12);
  --reader-spine-shadow: rgba(0, 0, 0, 0.08);
}

.reader-container[data-theme="sepia"] {
  --reader-bg: #f4ecd8;
  --reader-page-bg: #fbf7ee;
  --reader-text: #3c2f21;
  --reader-text-muted: #7c6853;
  --reader-border: #e0d5be;
  --reader-hud-bg: rgba(244, 236, 216, 0.94);
  --reader-shadow: rgba(60, 47, 33, 0.15);
  --reader-spine-shadow: rgba(60, 47, 33, 0.1);
}

.reader-container[data-theme="slate"] {
  --reader-bg: #22272e;
  --reader-page-bg: #2d333b;
  --reader-text: #adbac7;
  --reader-text-muted: #768390;
  --reader-border: #373e47;
  --reader-hud-bg: rgba(34, 39, 46, 0.94);
  --reader-shadow: rgba(0, 0, 0, 0.35);
  --reader-spine-shadow: rgba(0, 0, 0, 0.3);
}

.reader-container[data-theme="dark"] {
  --reader-bg: #121212;
  --reader-page-bg: #181818;
  --reader-text: #d6d6d6;
  --reader-text-muted: #707070;
  --reader-border: #282828;
  --reader-hud-bg: rgba(18, 18, 18, 0.94);
  --reader-shadow: rgba(0, 0, 0, 0.6);
  --reader-spine-shadow: rgba(0, 0, 0, 0.5);
}

/* Reader Typography Fonts */
.reader-container[data-font="serif"] .page-body {
  font-family: "Georgia", "Times New Roman", "Baskerville", serif;
}

.reader-container[data-font="sans"] .page-body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.reader-container[data-font="mono"] .page-body {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

.reader-container[data-font="dyslexic"] .page-body {
  font-family: "OpenDyslexic", "Comic Sans MS", cursive, sans-serif;
}

/* Heads-Up Display (HUD) */
.reader-hud {
  position: absolute;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 12px 24px;
  background-color: var(--reader-hud-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-color: var(--reader-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.reader-top-hud {
  top: 0;
  border-bottom: 1px solid var(--reader-border);
}

.reader-top-hud.hidden {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.reader-bottom-hud {
  bottom: 0;
  border-top: 1px solid var(--reader-border);
  gap: 16px;
}

.reader-bottom-hud.hidden {
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

.hud-left {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.reader-meta {
  min-width: 0;
}

.reader-title {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--reader-text);
}

.reader-subtitle {
  font-size: 0.78rem;
  color: var(--reader-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.hud-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Scrubber / Slider in Bottom HUD */
.reader-scrubber {
  flex: 1;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.page-slider {
  width: 100%;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: var(--reader-border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.page-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--reader-text);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.page-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--reader-text);
  cursor: pointer;
  border: none;
}

.page-indicator {
  font-size: 0.78rem;
  color: var(--reader-text-muted);
  font-family: var(--font-mono);
}

/* Reader Stage */
.reader-stage {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 56px 16px 64px 16px;
  perspective: 2500px;
  -webkit-perspective: 2500px;
  overflow: hidden;
  box-sizing: border-box;
  transition: padding 0.25s ease;
}

.reader-stage.hud-hidden {
  padding: 12px 16px;
}

/* Book Viewport Container */
.book-viewport {
  position: relative;
  width: calc(100vw - 24px);
  max-width: 98vw;
  height: calc(100% - 12px);
  max-height: calc(100vh - 24px);
  display: flex;
  align-items: stretch;
  justify-content: center;
  box-shadow: 0 16px 48px var(--reader-shadow);
  border-radius: 6px;
  background-color: var(--reader-page-bg);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: width 0.2s ease, height 0.2s ease;
}

.reader-stage.hud-hidden .book-viewport {
  height: calc(100% - 4px);
  max-height: calc(100vh - 12px);
  width: calc(100vw - 16px);
}

:fullscreen .book-viewport,
:-webkit-full-screen .book-viewport {
  width: calc(100vw - 8px);
  max-width: 100vw;
  height: calc(100vh - 8px);
  max-height: 100vh;
  border-radius: 0;
}

:fullscreen .reader-stage.hud-hidden,
:-webkit-full-screen .reader-stage.hud-hidden {
  padding: 4px 6px;
}

/* Spine Crease in Two-Page Mode */
.book-viewport.two-page .book-spine {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 30px;
  transform: translateX(-50%);
  z-index: 10;
  pointer-events: none;
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--reader-spine-shadow) 42%,
    rgba(0, 0, 0, 0.2) 50%,
    var(--reader-spine-shadow) 58%,
    transparent 100%
  );
}

.book-spine {
  display: none;
}

/* Pages */
.page-container {
  flex: 1;
  height: 100%;
  background-color: var(--reader-page-bg);
  overflow: hidden;
  position: relative;
  border-radius: 4px;
}

.page-right {
  display: none;
  border-left: 1px solid var(--reader-border);
}

.book-viewport.two-page .page-right {
  display: block;
}

.page-blank {
  width: 100%;
  height: 100%;
  background-color: var(--reader-page-bg);
}

/* Page Inner Content Wrapper */
.page-content-wrapper {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 20px clamp(16px, 3.5vw, 45px) 16px clamp(16px, 3.5vw, 45px);
  user-select: text;
  box-sizing: border-box;
  overflow: hidden;
}

.page-header-info {
  font-size: 0.75rem;
  color: var(--reader-text-muted);
  text-align: center;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex-shrink: 0;
}

.page-body {
  flex: 1;
  overflow: hidden;
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  color: var(--reader-text);
  display: flex;
  flex-direction: column;
  position: relative;
}

.page-footer-info {
  font-size: 0.75rem;
  color: var(--reader-text-muted);
  text-align: center;
  font-family: var(--font-mono);
  margin-top: 10px;
  flex-shrink: 0;
}

/* EPUB Multi-Column Paginated Layout */
.epub-page-frame {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
  user-select: text;
}

.epub-column-wrapper {
  height: 100%;
  box-sizing: border-box;
  will-change: transform;
}

.reader-measure-stage {
  position: absolute;
  visibility: hidden;
  pointer-events: none;
  top: -9999px;
  left: -9999px;
  z-index: -100;
  overflow: hidden;
}

/* EPUB Chapter Content Styling */
.epub-content {
  box-sizing: border-box;
  color: var(--reader-text);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  word-break: break-word;
}

.epub-content p {
  margin-bottom: 0.9em;
  text-indent: 1.5em;
  text-align: justify;
  orphans: 2;
  widows: 2;
}

.epub-content h1,
.epub-content h2,
.epub-content h3 {
  text-align: center;
  margin: 0.8em 0 0.5em 0;
  line-height: 1.25;
  break-after: avoid;
  page-break-after: avoid;
}

.epub-content img,
.epub-content svg,
.epub-content image {
  max-width: 100% !important;
  max-height: 75vh !important;
  height: auto !important;
  display: block;
  margin: 12px auto;
  border-radius: 4px;
  object-fit: contain;
  break-inside: avoid;
  page-break-inside: avoid;
}

/* PDF Canvas */
.pdf-canvas {
  display: block;
  margin: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* ========================================================
   3D REALISTIC PAGE TURNING ANIMATION
   ======================================================== */
.flipping-leaf {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 50;
  background-color: var(--reader-page-bg);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  pointer-events: none;
  box-shadow: 0 12px 36px var(--reader-shadow);
}

/* Forward Page Flip (from right to left) */
.flipping-leaf.flip-next {
  right: 0;
  width: 50%;
  transform-origin: left center;
  transform: rotateY(0deg);
  transition: transform 0.52s cubic-bezier(0.4, 0, 0.2, 1);
}

.book-viewport:not(.two-page) .flipping-leaf.flip-next {
  width: 100%;
}

.flipping-leaf.flip-next.turning {
  transform: rotateY(-180deg);
}

/* Backward Page Flip (from left to right) */
.flipping-leaf.flip-prev {
  left: 0;
  width: 50%;
  transform-origin: right center;
  transform: rotateY(-180deg);
  transition: transform 0.52s cubic-bezier(0.4, 0, 0.2, 1);
}

.book-viewport:not(.two-page) .flipping-leaf.flip-prev {
  width: 100%;
}

.flipping-leaf.flip-prev.turning {
  transform: rotateY(0deg);
}

/* Leaf Faces */
.leaf-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background-color: var(--reader-page-bg);
  overflow: hidden;
}

.leaf-front {
  z-index: 2;
}

.leaf-back {
  transform: rotateY(180deg);
  z-index: 1;
}

/* Dynamic Shadow Overlay during 3D flip */
.flipping-leaf::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(to right, rgba(0,0,0,0.2) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.52s ease;
}

.flipping-leaf.turning::after {
  opacity: 1;
}

/* Continuous Scroll Mode */
.scroll-viewport {
  width: min(98vw, 1500px);
  height: 100%;
  overflow-y: auto;
  background-color: var(--reader-page-bg);
  border-radius: 6px;
  padding: 30px clamp(20px, 4vw, 50px);
  box-shadow: 0 8px 32px var(--reader-shadow);
  scrollbar-width: thin;
  transition: width 0.2s ease;
}

:fullscreen .scroll-viewport,
:-webkit-full-screen .scroll-viewport {
  width: min(99vw, 2000px);
  padding: 40px clamp(32px, 6vw, 80px);
}

.scroll-chapter-item {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px dashed var(--reader-border);
}

.scroll-chapter-item:last-child {
  border-bottom: none;
  margin-bottom: 20px;
}

.scroll-chapter-title {
  font-size: 1.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  color: var(--reader-text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--reader-border);
}

.scroll-content {
  height: auto !important;
  overflow: visible !important;
}

.scroll-page-item {
  margin-bottom: 40px;
  padding-bottom: 30px;
  border-bottom: 1px dashed var(--reader-border);
}

/* Drawers & Modals */
.reader-drawer {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(85vw, 360px);
  z-index: 150;
  background-color: var(--reader-hud-bg);
  border-right: 1px solid var(--reader-border);
  box-shadow: 4px 0 24px var(--reader-shadow);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

.drawer-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
  padding: 10px 0;
}

.toc-item {
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--reader-text);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.toc-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.toc-item.active {
  font-weight: 600;
  border-left: 3px solid var(--reader-text);
}

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

.toc-page {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--reader-text-muted);
}

/* Appearance Settings Modal */
.reader-modal {
  position: absolute;
  top: 60px;
  right: 24px;
  width: min(90vw, 320px);
  z-index: 150;
  background-color: var(--reader-hud-bg);
  border: 1px solid var(--reader-border);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px var(--reader-shadow);
  padding: 18px 20px;
  display: none;
}

.reader-modal.active {
  display: block;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

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

.setting-label {
  display: block;
  font-size: 0.78rem;
  color: var(--reader-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.setting-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(65px, 1fr));
  gap: 6px;
}

.setting-theme-btn,
.setting-font-btn,
.setting-anim-btn {
  padding: 7px 0;
  font-size: 0.78rem;
  background: transparent;
  border: 1px solid var(--reader-border);
  border-radius: var(--radius-sm);
  color: var(--reader-text);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.setting-theme-btn:hover,
.setting-font-btn:hover,
.setting-anim-btn:hover {
  border-color: var(--reader-text);
}

.setting-theme-btn.active,
.setting-font-btn.active,
.setting-anim-btn.active {
  background-color: var(--reader-text);
  color: var(--reader-bg);
  border-color: var(--reader-text);
}

.setting-stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--reader-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.btn-stepper {
  width: 44px;
  height: 34px;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  color: var(--reader-text);
  cursor: pointer;
}

.btn-stepper:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.stepper-value {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

/* Reader Loader */
.reader-loader {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 80;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
}

.reader-loader.active {
  display: flex;
}

.loader-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-text {
  font-size: 0.88rem;
  color: #ffffff;
  letter-spacing: 0.05em;
}

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

@media (max-width: 860px) {
  .page-content-wrapper {
    padding: 20px 24px 18px 24px;
  }
  .book-viewport {
    width: 96vw;
    height: 82vh;
  }
}