/* ==========================================================================
   Musafir Cafe Audiobook & Reader - Core Design System & Stylesheet
   ========================================================================== */

:root {
  /* Default: Cafe Amber Theme */
  --bg-primary: #120e0c;
  --bg-secondary: #1a1512;
  --bg-card: rgba(36, 28, 24, 0.88);
  --bg-glass: rgba(26, 21, 18, 0.85);
  --bg-hover: rgba(220, 140, 70, 0.12);
  --border-color: rgba(220, 150, 90, 0.18);
  --border-glow: rgba(230, 140, 60, 0.35);
  
  --accent-primary: #e67e22;
  --accent-secondary: #f39c12;
  --accent-gradient: linear-gradient(135deg, #e67e22 0%, #d35400 100%);
  --accent-glow: 0 0 20px rgba(230, 126, 34, 0.4);
  
  --text-primary: #fdf5ec;
  --text-secondary: #d5c3b2;
  --text-muted: #9e8a78;
  
  --highlight-bg: rgba(230, 126, 34, 0.16);
  --highlight-border: #e67e22;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  
  --font-heading: 'Playfair Display', 'Rozha One', Georgia, serif;
  --font-body-serif: 'Playfair Display', 'Noto Serif Devanagari', 'Georgia', serif;
  --font-body-sans: 'Plus Jakarta Sans', 'Noto Sans Devanagari', 'Outfit', sans-serif;
  --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --reader-font-size: 1.15rem;
  --reader-line-height: 1.85;
  --sidebar-width: 380px;
  --header-height: 70px;
  --ambient-bar-height: 48px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Theme: Dark Velvet */
[data-theme="dark"] {
  --bg-primary: #0a0b10;
  --bg-secondary: #12141c;
  --bg-card: rgba(22, 26, 38, 0.88);
  --bg-glass: rgba(18, 20, 28, 0.85);
  --bg-hover: rgba(99, 102, 241, 0.12);
  --border-color: rgba(99, 102, 241, 0.18);
  --border-glow: rgba(129, 140, 248, 0.4);
  
  --accent-primary: #818cf8;
  --accent-secondary: #6366f1;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #4f46e5 100%);
  --accent-glow: 0 0 20px rgba(99, 102, 241, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --highlight-bg: rgba(99, 102, 241, 0.16);
  --highlight-border: #818cf8;
}

/* Theme: Sepia Vintage */
[data-theme="sepia"] {
  --bg-primary: #f5ede0;
  --bg-secondary: #ebe0cf;
  --bg-card: rgba(240, 230, 215, 0.92);
  --bg-glass: rgba(235, 224, 207, 0.88);
  --bg-hover: rgba(180, 100, 40, 0.1);
  --border-color: rgba(140, 90, 40, 0.2);
  --border-glow: rgba(180, 100, 40, 0.3);
  
  --accent-primary: #b3541e;
  --accent-secondary: #8c3b12;
  --accent-gradient: linear-gradient(135deg, #c05c26 0%, #8c3b12 100%);
  --accent-glow: 0 0 16px rgba(179, 84, 30, 0.3);
  
  --text-primary: #2d1f15;
  --text-secondary: #4a382b;
  --text-muted: #7c6858;
  
  --highlight-bg: rgba(179, 84, 30, 0.12);
  --highlight-border: #b3541e;
}

/* Theme: Light Clean */
[data-theme="light"] {
  --bg-primary: #fdfdfd;
  --bg-secondary: #f4f4f7;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.9);
  --bg-hover: rgba(230, 126, 34, 0.08);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(230, 126, 34, 0.25);
  
  --accent-primary: #d35400;
  --accent-secondary: #e67e22;
  --accent-gradient: linear-gradient(135deg, #e67e22 0%, #d35400 100%);
  --accent-glow: 0 0 16px rgba(211, 84, 0, 0.2);
  
  --text-primary: #1a1a1e;
  --text-secondary: #3b3b44;
  --text-muted: #71717a;
  
  --highlight-bg: rgba(230, 126, 34, 0.1);
  --highlight-border: #d35400;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body-serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.font-sans {
  font-family: var(--font-body-sans);
}

/* Screen Reader Only Utility for Accessible & SEO Microdata */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* App Header */
.app-header {
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: relative;
  z-index: 50;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 1.85rem;
  filter: drop-shadow(0 2px 8px rgba(230, 126, 34, 0.5));
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.brand-sub {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
}

/* Text Language Mode Switcher */
.header-center {
  display: flex;
  justify-content: center;
}

.text-lang-toggle {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 3px;
  box-shadow: var(--shadow-sm);
}

.lang-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.95rem;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

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

.lang-tab-btn.active {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(230, 126, 34, 0.4);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.dropdown-control {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.select-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.38rem 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.select-voice {
  max-width: 220px;
}

.select-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--border-glow);
}

.font-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.2rem;
  border-radius: var(--radius-sm);
}

/* Ambient Soundscape Bar */
.ambient-bar {
  height: var(--ambient-bar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  z-index: 45;
}

.ambient-left {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.ambient-label {
  color: var(--text-muted);
  font-weight: 500;
}

.ambient-pills {
  display: flex;
  gap: 0.4rem;
}

.ambient-pill {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.65rem;
  border-radius: 16px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: var(--transition);
}

.ambient-pill:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.ambient-pill.active {
  background: var(--highlight-bg);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  font-weight: 600;
}

.ambient-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ambient-vol-label {
  color: var(--text-muted);
  font-size: 0.78rem;
}

#ambient-volume {
  width: 70px;
  height: 4px;
  accent-color: var(--accent-primary);
  cursor: pointer;
}

/* Icon Buttons */
.icon-btn, .icon-btn-secondary {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  outline: none;
}

.icon-btn:hover, .icon-btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--accent-primary);
}

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

.text-btn {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.85rem;
  width: 30px;
  height: 30px;
}

#font-type-label {
  font-size: 0.78rem;
  font-weight: 600;
}

/* App Layout */
.app-layout {
  display: flex;
  height: calc(100vh - var(--header-height) - var(--ambient-bar-height));
  position: relative;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 40;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  position: absolute;
}

.sidebar-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.book-card {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.book-cover-img {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

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

.book-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.book-author {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.book-meta {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--accent-primary);
  margin-top: 0.2rem;
}

.progress-bar-container {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  margin-top: 0.5rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

.progress-text {
  display: block;
  font-size: 0.72rem;
  font-family: var(--font-ui);
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
}

.search-box input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.88rem;
  width: 100%;
  outline: none;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.chapter-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* Chapter Item */
.chapter-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.chapter-item:hover {
  background: var(--bg-hover);
}

.chapter-item.active {
  background: var(--highlight-bg);
  border-color: var(--highlight-border);
}

.ch-number-badge {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-primary);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.chapter-item.active .ch-number-badge {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.ch-details {
  flex: 1;
  min-width: 0;
}

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

.ch-sub {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.5rem;
  margin-top: 0.15rem;
}

.ch-status-indicator {
  font-size: 0.8rem;
  opacity: 0.6;
}

.chapter-item.active .ch-status-indicator {
  opacity: 1;
  color: var(--accent-primary);
}

.sidebar-footer {
  padding: 0.9rem 1.25rem;
  border-top: 1px solid var(--border-color);
}

/* Reader Viewport */
.reader-viewport {
  flex: 1;
  height: 100%;
  overflow-y: auto;
  padding: 1.5rem 2rem 4rem 2rem;
  scroll-behavior: smooth;
}

.reader-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Player Hero Card */
.player-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.8rem;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 30;
}

.player-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.chapter-num-tag {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-primary);
  letter-spacing: 1px;
}

.current-chapter-title {
  font-family: var(--font-heading);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0.2rem 0 0.4rem 0;
}

.chapter-stats {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge-status {
  background: rgba(39, 174, 96, 0.15);
  color: #2ecc71;
  border: 1px solid rgba(39, 174, 96, 0.3);
  padding: 0.1rem 0.5rem;
  border-radius: 20px;
  font-size: 0.75rem;
}

/* Buttons */
.btn {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid transparent;
  transition: var(--transition);
  outline: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: var(--accent-glow);
}

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

.btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.w-full {
  width: 100%;
}

/* Waveform Visualizer */
.waveform-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 28px;
  margin: 1rem 0 0.5rem 0;
}

.wave-bar {
  width: 3px;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  transition: height 0.2s ease, background 0.2s ease;
}

.playing .wave-bar {
  background: var(--accent-primary);
  animation: wave 1.2s ease-in-out infinite alternate;
}

.playing .wave-bar:nth-child(2n) { animation-delay: 0.2s; }
.playing .wave-bar:nth-child(3n) { animation-delay: 0.4s; }
.playing .wave-bar:nth-child(4n) { animation-delay: 0.6s; }

@keyframes wave {
  0% { height: 4px; }
  50% { height: 26px; }
  100% { height: 8px; }
}

/* Scrub Bar */
.scrub-container {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 0.5rem;
}

.time-label {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 38px;
  text-align: center;
}

.scrub-bar {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  position: relative;
  cursor: pointer;
  user-select: none;
}

.scrub-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 6px;
  pointer-events: none;
}

.scrub-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  transition: transform 0.1s ease;
}

.scrub-bar:hover .scrub-thumb {
  transform: translate(-50%, -50%) scale(1.3);
}

/* Player Controls Row */
.player-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
}

.controls-left, .controls-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 1;
}

.controls-right {
  justify-content: flex-end;
}

.controls-main {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.control-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: var(--transition);
  position: relative;
}

.control-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: scale(1.05);
}

.skip-badge {
  position: absolute;
  font-family: var(--font-ui);
  font-size: 0.55rem;
  font-weight: 800;
  bottom: 6px;
  pointer-events: none;
}

.play-btn-large {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(230, 126, 34, 0.45);
  transition: var(--transition);
}

.play-btn-large:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 26px rgba(230, 126, 34, 0.6);
}

.play-btn-large:active {
  transform: scale(0.96);
}

/* Speed Control Dropdown */
.speed-control {
  position: relative;
}

.badge-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.badge-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.speed-menu {
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  min-width: 130px;
  overflow: hidden;
  z-index: 60;
}

.speed-menu.show {
  display: flex;
}

.speed-menu button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 0.8rem;
  text-align: left;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition);
}

.speed-menu button:hover, .speed-menu button.active {
  background: var(--bg-hover);
  color: var(--accent-primary);
}

/* Volume Slider */
.volume-control {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

#volume-slider {
  width: 65px;
  height: 4px;
  accent-color: var(--accent-primary);
  cursor: pointer;
}

/* Chapter Content Box */
.chapter-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 3.5rem;
  box-shadow: var(--shadow-lg);
}

.chapter-header-intro {
  text-align: center;
  margin-bottom: 2.5rem;
}

.story-chapter-heading {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
}

.story-subheading {
  font-family: 'Noto Serif Devanagari', serif;
  font-size: 1.1rem;
  color: var(--accent-primary);
  margin-top: 0.4rem;
  font-weight: 500;
}

.divider-floral {
  font-size: 1.2rem;
  color: var(--accent-primary);
  margin-top: 0.8rem;
  letter-spacing: 4px;
}

.story-paragraphs {
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.story-p {
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.story-p:hover {
  background: var(--bg-hover);
}

.story-p.active-reading {
  background: var(--highlight-bg);
  border-left: 4px solid var(--highlight-border);
  padding-left: 1.1rem;
  color: var(--text-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* Dual View Layout */
.dual-paragraph-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.dual-paragraph-row:hover {
  background: var(--bg-hover);
}

.dual-paragraph-row.active-reading {
  background: var(--highlight-bg);
  border-color: var(--highlight-border);
}

.dual-col-en {
  font-family: var(--font-body-serif);
  color: var(--text-primary);
  border-right: 1px solid var(--border-color);
  padding-right: 1rem;
}

.dual-col-hi {
  font-family: 'Noto Serif Devanagari', serif;
  color: var(--text-secondary);
}

/* SEO & LLM Story Overview Card */
.seo-story-overview {
  margin-top: 2rem;
}

.seo-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
}

.seo-card h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--text-primary);
  margin-bottom: 0.8rem;
}

.seo-card p {
  font-family: var(--font-ui);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
}

.seo-features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.seo-features-grid h3 {
  font-family: var(--font-ui);
  font-size: 1rem;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.seo-features-grid p {
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
}

/* Bottom Chapter Navigation */
.chapter-navigation-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.chapter-indicator-bottom {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 580px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.6rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.modal-body h4 {
  color: var(--text-primary);
  margin: 1rem 0 0.5rem 0;
}

.modal-body ul {
  padding-left: 1.2rem;
  margin-bottom: 1rem;
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

kbd {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
}

.code-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--accent-primary);
  overflow-x: auto;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .app-layout {
    position: relative;
  }
  .sidebar {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    box-shadow: var(--shadow-lg);
  }
  .chapter-content-box {
    padding: 2rem 1.5rem;
  }
  .player-card {
    padding: 1.2rem 1.2rem;
  }
  .story-chapter-heading {
    font-size: 1.8rem;
  }
  .dual-paragraph-row {
    grid-template-columns: 1fr;
  }
  .dual-col-en {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.8rem;
  }
  .seo-features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: 0 0.8rem;
  }
  .brand-sub, .header-center, .volume-control {
    display: none;
  }
  .ambient-bar {
    padding: 0 0.8rem;
    overflow-x: auto;
  }
  .reader-viewport {
    padding: 0.8rem 0.8rem 4rem 0.8rem;
  }
  .current-chapter-title {
    font-size: 1.2rem;
  }
  .player-controls-row {
    flex-wrap: wrap;
    gap: 0.8rem;
  }
  .controls-left, .controls-right {
    flex: auto;
  }
}