/* ==========================================================================
   IVEACER Digital Library - Immersive Read-Only Reader Mode Styles v4.7
   Institute: IVEACER Digital Library (iveacer.ac.th)
   ========================================================================== */

/* 1. Base Overlay Container */
.reader-mode-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
  font-family: 'Kanit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  user-select: text;
  -webkit-user-select: text;
}

.reader-mode-overlay.hidden {
  display: none !important;
}

/* 2. Theme Definitions */
/* --- Clean White Theme --- */
.reader-theme-clean-white {
  background-color: #FFFFFF !important;
  color: #1E293B !important;
}
.reader-theme-clean-white .reader-toolbar {
  background-color: rgba(248, 250, 252, 0.97) !important;
  border-bottom: 1px solid #E2E8F0 !important;
  color: #1E293B !important;
}
.reader-theme-clean-white .reader-btn {
  background-color: #FFFFFF;
  color: #334155;
  border: 1px solid #CBD5E1;
}
.reader-theme-clean-white .reader-btn:hover,
.reader-theme-clean-white .reader-btn.active {
  background-color: #0284C7 !important;
  color: #FFFFFF !important;
  border-color: #0284C7 !important;
}
.reader-theme-clean-white .reader-select {
  background-color: #FFFFFF;
  color: #1E293B;
  border: 1px solid #CBD5E1;
}
.reader-theme-clean-white .tts-highlight-active,
.reader-theme-clean-white .tts-word-highlight {
  background-color: rgba(2, 132, 199, 0.22) !important;
  color: #0369A1 !important;
  box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.35);
}

/* --- Sepia / Warm Parchment Theme --- */
.reader-theme-sepia {
  background-color: #FDF6E2 !important;
  color: #433422 !important;
}
.reader-theme-sepia .reader-toolbar {
  background-color: rgba(244, 236, 205, 0.97) !important;
  border-bottom: 1px solid #E8DCB8 !important;
  color: #433422 !important;
}
.reader-theme-sepia .reader-btn {
  background-color: #FDF6E2;
  color: #5C4830;
  border: 1px solid #DACCA3;
}
.reader-theme-sepia .reader-btn:hover,
.reader-theme-sepia .reader-btn.active {
  background-color: #B45309 !important;
  color: #FFFFFF !important;
  border-color: #B45309 !important;
}
.reader-theme-sepia .reader-select {
  background-color: #FDF6E2;
  color: #433422;
  border: 1px solid #DACCA3;
}
.reader-theme-sepia .tts-highlight-active,
.reader-theme-sepia .tts-word-highlight {
  background-color: rgba(217, 119, 6, 0.28) !important;
  color: #7C2D12 !important;
  box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.45);
}

/* --- Dark Obsidian Theme --- */
.reader-theme-dark-obsidian {
  background-color: #0F172A !important;
  color: #E2E8F0 !important;
}
.reader-theme-dark-obsidian .reader-toolbar {
  background-color: rgba(9, 13, 22, 0.97) !important;
  border-bottom: 1px solid #1E293B !important;
  color: #E2E8F0 !important;
}
.reader-theme-dark-obsidian .reader-btn {
  background-color: #1E293B;
  color: #CBD5E1;
  border: 1px solid #334155;
}
.reader-theme-dark-obsidian .reader-btn:hover,
.reader-theme-dark-obsidian .reader-btn.active {
  background-color: #38BDF8 !important;
  color: #0F172A !important;
  border-color: #38BDF8 !important;
}
.reader-theme-dark-obsidian .reader-select {
  background-color: #1E293B;
  color: #E2E8F0;
  border: 1px solid #334155;
}
.reader-theme-dark-obsidian .tts-highlight-active,
.reader-theme-dark-obsidian .tts-word-highlight {
  background-color: rgba(56, 189, 248, 0.28) !important;
  color: #38BDF8 !important;
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.45);
}

/* 3. Typography Rules */
.reader-font-14 { font-size: 14px !important; }
.reader-font-16 { font-size: 16px !important; }
.reader-font-18 { font-size: 18px !important; }
.reader-font-22 { font-size: 22px !important; }

.reader-leading-1-5 { line-height: 1.5 !important; }
.reader-leading-1-8 { line-height: 1.8 !important; }
.reader-leading-2-2 { line-height: 2.2 !important; }

/* 4. Canvas Body & Content Area */
.reader-canvas-body {
  flex: 1;
  overflow-y: auto;
  padding: 2.5rem 1.5rem 6rem 1.5rem;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.reader-text-container {
  max-width: 68ch;
  margin: 0 auto;
  word-break: break-word;
  overflow-wrap: break-word;
  line-break: loose;
  text-align: justify;
  text-justify: inter-cluster;
  transition: font-size 0.2s ease, line-height 0.2s ease;
}

.reader-text-container p {
  margin-bottom: 1.6em;
  text-indent: 2em;
}

.reader-text-container h1,
.reader-text-container h2,
.reader-text-container h3,
.reader-text-container h4 {
  font-weight: 700;
  margin-top: 1.8em;
  margin-bottom: 0.8em;
  line-height: 1.3;
}

/* 5. Synchronized TTS Highlighting */
.tts-word {
  display: inline;
  padding: 1px 2px;
  border-radius: 3px;
  transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.tts-highlight-active,
.tts-word-highlight {
  border-radius: 4px;
  transition: all 0.15s ease;
}

/* 6. Toolbar & Control Elements */
.reader-toolbar {
  padding: 0.625rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.reader-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 0.625rem;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.reader-select {
  padding: 0.3rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 0.5rem;
  cursor: pointer;
  outline: none;
}

/* 7. Scrollbar for Reader Mode */
.reader-canvas-body::-webkit-scrollbar {
  width: 8px;
}
.reader-theme-clean-white .reader-canvas-body::-webkit-scrollbar-track {
  background: #F1F5F9;
}
.reader-theme-clean-white .reader-canvas-body::-webkit-scrollbar-thumb {
  background: #CBD5E1;
  border-radius: 4px;
}
.reader-theme-sepia .reader-canvas-body::-webkit-scrollbar-track {
  background: #EDE4CD;
}
.reader-theme-sepia .reader-canvas-body::-webkit-scrollbar-thumb {
  background: #DACCA3;
  border-radius: 4px;
}
.reader-theme-dark-obsidian .reader-canvas-body::-webkit-scrollbar-track {
  background: #090D16;
}
.reader-theme-dark-obsidian .reader-canvas-body::-webkit-scrollbar-thumb {
  background: #1E293B;
  border-radius: 4px;
}