/* ==========================================================================
   PREMIUM PAGE-FLIP BOOK READER
   Author Website — Father VM Thomas
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
  --reader-bg:       #2a1f14;
  --reader-paper:    #faf3e4;
  --reader-paper2:   #f5ead0;
  --reader-ink:      #2c1a0e;
  --reader-accent:   #c8963e;
  --reader-spine:    #3d1f08;
  --reader-shadow:   rgba(30, 15, 5, 0.65);
  --reader-toolbar:  rgba(20, 12, 5, 0.92);
  --reader-sidebar-w: 280px;
  --reader-trans:    0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Night mode overrides */
  --night-paper:     #1a1209;
  --night-ink:       #d4b896;

  /* Sepia overrides */
  --sepia-paper:     #f2e0c0;
  --sepia-ink:       #5c3a1e;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

body.reader-body {
  margin: 0;
  background: var(--reader-bg);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(74,44,10,0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(74,44,10,0.15) 0%, transparent 60%);
  font-family: 'Lora', Georgia, serif;
  color: var(--reader-ink);
  overflow: hidden;
  height: 100vh;
  min-height: 100vh;
}

/* PDF mode — no body scroll, iframe fills everything */
body.reader-body.pdf-mode {
  overflow: hidden;
  height: 100vh;
}

/* Empty state shell */
.reader-empty-shell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  margin-top: 56px;
}


/* ---------- Toolbar ---------- */
.reader-toolbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--reader-toolbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(200,150,62,0.2);
  padding: 0 20px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.reader-back-btn {
  color: var(--reader-accent);
  text-decoration: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 6px 12px;
  border: 1px solid rgba(200,150,62,0.35);
  border-radius: 6px;
  transition: var(--reader-trans);
  white-space: nowrap;
  flex-shrink: 0;
}
.reader-back-btn:hover {
  background: rgba(200,150,62,0.15);
  border-color: var(--reader-accent);
}

.reader-title {
  flex: 1;
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  font-weight: 600;
  color: #e8d5b0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.ctrl-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(200,150,62,0.25);
  color: #d4b896;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  transition: var(--reader-trans);
  line-height: 1;
  white-space: nowrap;
}
.ctrl-btn:hover {
  background: rgba(200,150,62,0.2);
  border-color: var(--reader-accent);
  color: var(--reader-accent);
}
.ctrl-btn.active {
  background: var(--reader-accent);
  border-color: var(--reader-accent);
  color: #fff;
}

.ctrl-divider {
  width: 1px;
  height: 22px;
  background: rgba(200,150,62,0.2);
  margin: 0 4px;
}

.reader-progress-text {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  color: #8a6f4e;
  min-width: 52px;
  text-align: center;
}

/* ---------- Progress Bar ---------- */
.reader-progress-bar {
  position: fixed;
  top: 56px; left: 0; right: 0;
  height: 3px;
  background: rgba(200,150,62,0.15);
  z-index: 999;
}
.reader-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--reader-accent), #e8b05a);
  transition: width 0.5s ease;
  width: 0%;
}

/* ---------- Layout ---------- */
.reader-layout {
  display: flex;
  height: 100vh;
  padding-top: 59px;
  overflow: hidden;
}

/* ---------- Chapter Sidebar ---------- */
.reader-sidebar {
  position: fixed;
  top: 59px;
  left: calc(-1 * var(--reader-sidebar-w));
  width: var(--reader-sidebar-w);
  height: calc(100vh - 59px);
  background: #120d08;
  border-right: 1px solid rgba(200,150,62,0.15);
  transition: left var(--reader-trans);
  z-index: 900;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #4a2c0a #120d08;
}
.reader-sidebar.open {
  left: 0;
}

.sidebar-inner {
  padding: 24px 16px;
}
.sidebar-heading {
  font-family: 'Playfair Display', serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--reader-accent);
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sidebar-close {
  background: none;
  border: none;
  color: #8a6f4e;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 2px 6px;
  border-radius: 4px;
  transition: var(--reader-trans);
}
.sidebar-close:hover { color: var(--reader-accent); }

.sidebar-section { margin-bottom: 28px; }
.sidebar-section-title {
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #5a4030;
  margin-bottom: 10px;
}

.chapter-list, .bookmark-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.chapter-item, .bookmark-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--reader-trans);
  margin-bottom: 2px;
  border: 1px solid transparent;
}
.chapter-item:hover, .bookmark-item:hover {
  background: rgba(200,150,62,0.1);
  border-color: rgba(200,150,62,0.2);
}
.chapter-item.active {
  background: rgba(200,150,62,0.15);
  border-color: rgba(200,150,62,0.35);
}
.chapter-num {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--reader-accent);
  min-width: 28px;
}
.chapter-title {
  font-size: 0.8rem;
  color: #b8956e;
  line-height: 1.3;
}
.bookmark-page {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  color: var(--reader-accent);
  min-width: 24px;
}
.bookmark-title {
  font-size: 0.78rem;
  color: #b8956e;
}
.bookmark-delete {
  margin-left: auto;
  background: none;
  border: none;
  color: #5a4030;
  cursor: pointer;
  font-size: 0.8rem;
  padding: 2px 4px;
  border-radius: 3px;
  transition: var(--reader-trans);
}
.bookmark-delete:hover { color: #e05050; }

.no-items {
  font-size: 0.78rem;
  color: #5a4030;
  font-style: italic;
  padding: 8px 10px;
}

/* ---------- Main Stage ---------- */
.reader-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 56px 20px 96px;
  transition: margin-left var(--reader-trans);
  height: calc(100vh - 59px);
  min-height: 0;
  overflow: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  overscroll-behavior: contain;
}
.reader-stage::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

/* ---------- Book Container ---------- */
.book-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Ambient glow behind book */
.book-container::before {
  content: '';
  position: absolute;
  width: 110%;
  height: 110%;
  background: radial-gradient(ellipse at center, rgba(200,150,62,0.08) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

/* Book shadow on table */
.book-container::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 10%;
  right: 10%;
  height: 30px;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0.5) 0%, transparent 70%);
  filter: blur(8px);
  pointer-events: none;
}

/* ---------- StPageFlip canvas wrapper ---------- */
#book-stage {
  box-shadow:
    -8px 0 20px rgba(0,0,0,0.4),
    8px 0 20px rgba(0,0,0,0.4),
    0 20px 60px rgba(0,0,0,0.5);
  border-radius: 2px 4px 4px 2px;
  position: relative;
}

/* ---------- Individual Pages ---------- */
.book-page {
  background: var(--reader-paper);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  padding: 40px 36px 40px 42px;
  height: 100%;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Left page (odd) — spine edge on right */
.book-page.page-left {
  background-image:
    linear-gradient(to right, transparent 95%, rgba(0,0,0,0.04) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  padding-right: 42px;
}

/* Right page — spine edge on left */
.book-page.page-right {
  background-image:
    linear-gradient(to left, transparent 95%, rgba(0,0,0,0.04) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  padding-left: 48px;
}

/* Cover page special */
.book-page.page-cover {
  background: linear-gradient(160deg, #4a2c0a, #2a1505);
  padding: 0;
  overflow: hidden;
}
.book-page.page-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Page Content ---------- */
.page-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.page-header {
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(74,44,10,0.15);
}
.page-book-title {
  font-family: 'Playfair Display', serif;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9a7250;
}

.page-chapter {
  font-family: 'Playfair Display', serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--reader-ink);
  margin-bottom: 14px;
  line-height: 1.3;
}

.page-text {
  font-family: 'Lora', Georgia, serif;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--reader-ink);
  text-align: justify;
  hyphens: auto;
  column-count: 1;
  overflow: hidden;
}
.page-text p { margin: 0 0 1em; }
.page-text p:first-child::first-letter {
  font-family: 'Playfair Display', serif;
  font-size: 3.5em;
  font-weight: 700;
  float: left;
  line-height: 0.75;
  margin: 0.1em 0.08em 0 0;
  color: var(--reader-accent);
}

.page-number {
  text-align: center;
  font-family: 'Lora', serif;
  font-size: 0.72rem;
  color: #9a7250;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid rgba(74,44,10,0.1);
}

/* Image page */
.book-page.page-image {
  padding: 16px;
}
.book-page.page-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ---------- Page Navigation ---------- */
.page-nav {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--reader-toolbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(200,150,62,0.2);
  border-radius: 50px;
  padding: 8px 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.nav-btn {
  background: none;
  border: none;
  color: var(--reader-accent);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 50%;
  transition: var(--reader-trans);
  line-height: 1;
}
.nav-btn:hover {
  background: rgba(200,150,62,0.15);
  transform: scale(1.1);
}
.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
}
.page-indicator-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s ease;
}
.page-indicator-wrap:hover {
  background: rgba(212, 175, 55, 0.1);
}

.page-indicator {
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  color: #b8956e;
  min-width: 80px;
  text-align: center;
  user-select: none;
}

.goto-flyout {
  position: absolute;
  bottom: calc(100% + 15px);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #1a1510;
  border: 1px solid rgba(212, 175, 55, 0.3);
  padding: 8px;
  border-radius: 8px;
  display: flex;
  gap: 6px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.5);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 100;
}
.goto-flyout.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.goto-flyout input {
  width: 60px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  padding: 6px 4px;
  border-radius: 4px;
  text-align: center;
}
.goto-flyout input:focus {
  outline: none;
  border-color: #d4af37;
}
.goto-flyout input::-webkit-outer-spin-button,
.goto-flyout input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.goto-flyout button {
  background: #d4af37;
  color: #000;
  border: none;
  border-radius: 4px;
  padding: 0 12px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s;
}
.goto-flyout button:hover {
  background: #f1c40f;
}
.goto-flyout::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: #1a1510 transparent transparent transparent;
}
.goto-flyout::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 7px;
  border-style: solid;
  border-color: rgba(212, 175, 55, 0.3) transparent transparent transparent;
  z-index: -1;
}

/* Top Flyout Overrides */
.goto-flyout.top-flyout {
  bottom: auto;
  top: calc(100% + 15px);
  transform: translateX(-50%) translateY(-10px);
}
.goto-flyout.top-flyout.active {
  transform: translateX(-50%) translateY(0);
}
.goto-flyout.top-flyout::after {
  top: auto;
  bottom: 100%;
  border-color: transparent transparent #1a1510 transparent;
}
.goto-flyout.top-flyout::before {
  top: auto;
  bottom: 100%;
  border-color: transparent transparent rgba(212, 175, 55, 0.3) transparent;
}
/* ---------- Keyboard Hint ---------- */
.keyboard-hint {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  color: rgba(138, 111, 78, 0.5);
  pointer-events: none;
}

/* ---------- Bookmark Ribbon ---------- */
.bookmark-ribbon {
  position: absolute;
  top: 0;
  right: 20px;
  width: 28px;
  height: 44px;
  cursor: pointer;
  z-index: 10;
}
.bookmark-ribbon svg { width: 100%; height: 100%; }

/* ---------- Fullscreen ---------- */
body.reader-fullscreen .reader-toolbar {
  transform: translateY(-100%);
  transition: transform 0.4s ease;
}
body.reader-fullscreen:hover .reader-toolbar {
  transform: translateY(0);
}
body.reader-fullscreen .reader-progress-bar { top: 0; }

/* ---------- Theme: Night Mode ---------- */
body.reader-night {
  --reader-bg: #0d0905;
  --reader-paper: var(--night-paper);
  --reader-ink: var(--night-ink);
}
body.reader-night .reader-stage {
  background: #0d0905;
}
body.reader-night .book-page {
  background: #1a1209;
  filter: brightness(0.92);
}
body.reader-night .page-text {
  color: var(--night-ink);
}
body.reader-night .page-book-title,
body.reader-night .page-number { color: #5a4828; }
body.reader-night .page-header { border-color: rgba(255,220,150,0.08); }

/* ---------- Theme: Sepia Mode ---------- */
body.reader-sepia {
  --reader-bg: #2e1e0e;
  --reader-paper: var(--sepia-paper);
  --reader-ink: var(--sepia-ink);
}
body.reader-sepia .book-page {
  background: #f2e0c0;
}
body.reader-sepia .page-text {
  color: var(--sepia-ink);
}

/* ---------- PDF Flip Pages ---------- */
.pdf-page-slot {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  overflow: hidden;
}
.pdf-page-placeholder {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 90px;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(74,44,10,0.08);
  color: rgba(74,44,10,0.5);
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
}
.pdf-page-canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  transition: filter 0.3s ease;
  background: #fff;
}

body.reader-night .pdf-page-canvas {
  /* Invert colors, flip hue back, dim brightness */
  filter: invert(0.92) hue-rotate(180deg) brightness(0.9) contrast(1.1);
}

body.reader-sepia .pdf-page-canvas {
  /* Give it a warm aged look */
  filter: sepia(0.4) brightness(0.95) contrast(0.95);
}

/* ---------- Empty state shell ---------- */
.reader-empty-shell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  padding-top: 56px;
}


/* ---------- Responsive ---------- */
@media (max-width: 1199px) {
  .keyboard-hint { display: none; }
}

@media (max-width: 767px) {
  .reader-toolbar { padding: 0 10px; gap: 8px; }
  .reader-title   { display: none; }
  .ctrl-divider   { display: none; }
  .reader-progress-text { display: none; }
  .page-nav { padding: 6px 14px; gap: 10px; }
  .nav-btn  { font-size: 1.2rem; }
  .reader-stage { padding: 36px 8px 86px; }
  .book-page { padding: 28px 22px; }
  .page-text { font-size: 0.88rem; line-height: 1.75; }
}

/* ---------- Loading state ---------- */
.reader-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: calc(100vh - 59px);
  color: #8a6f4e;
  gap: 16px;
}
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(200,150,62,0.15);
  border-top-color: var(--reader-accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.reader-loading p {
  font-family: 'Lora', serif;
  font-size: 0.9rem;
  opacity: 0.7;
}

/* ---------- Empty state ---------- */
.reader-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #8a6f4e;
  gap: 16px;
  padding: 60px 40px;
}
.reader-empty .empty-icon { font-size: 3.5rem; opacity: 0.5; }
.reader-empty h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  color: #b8956e;
  margin: 0;
}
.reader-empty p {
  font-size: 0.9rem;
  max-width: 380px;
  line-height: 1.7;
  opacity: 0.8;
  margin: 0;
}
.reader-empty-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.reader-empty .btn {
  margin-top: 8px;
  padding: 10px 24px;
  border: 1px solid var(--reader-accent);
  border-radius: 8px;
  color: var(--reader-accent);
  text-decoration: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--reader-trans);
}
.reader-empty .btn:hover { background: rgba(200,150,62,0.15); }

/* ---------- Zoom container ---------- */
.reader-zoom-wrap {
  transform-origin: center top;
  transition: transform 0.3s ease;
}

/* ---------- Flip hint ---------- */
.flip-hint {
  position: fixed;
  bottom: 80px;
  right: 40px;
  color: rgba(200,150,62,0.6);
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  pointer-events: none;
  animation: page-hint 4s ease-in-out forwards;
}
@keyframes page-hint {
  0%,100% { opacity: 0; }
  20%,80%  { opacity: 1; }
}