/* ═══════════════════════════════════════════
   Bookwave — Design System
   ═══════════════════════════════════════════ */

:root {
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F5F1EC;
  --color-border: #E8E3DC;
  --color-text: #2D2D2D;
  --color-text-muted: #6B6560;
  --color-primary: #1B2A4A;
  --color-primary-light: #2A3F6A;
  --color-accent: #C9915A;
  --color-accent-light: #E8C9A0;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(27, 42, 74, 0.08);
  --shadow-lg: 0 8px 32px rgba(27, 42, 74, 0.12);
  --max-width: 1200px;
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Header ─── */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.95);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon { font-size: 1.5rem; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  font-size: 0.95rem;
}

.nav-link:hover { color: var(--color-primary); }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-alt);
}

/* ─── Hero ─── */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #2A3F6A 50%, #3A4F7A 100%);
  color: white;
  padding: 100px 24px 120px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(201, 145, 90, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.15rem;
  opacity: 0.85;
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta .btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: 1.05rem;
  padding: 14px 36px;
}

.hero-cta .btn-primary:hover {
  background: #D4A06A;
}

.hero-formats {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.format-pill {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* ─── Value Props ─── */
.value-props {
  padding: 80px 0;
}

.props-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.prop-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
}

.prop-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.prop-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.prop-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.prop-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ─── Section Headers ─── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--color-primary);
}

.see-all {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.see-all:hover { color: var(--color-primary); }

/* ─── Featured Section ─── */
.featured-section {
  padding: 0 0 80px;
}

/* ─── Book Grid ─── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 28px;
}

.books-grid-small {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

.book-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.book-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.book-cover {
  position: relative;
  aspect-ratio: 2/3;
  overflow: hidden;
  background: var(--color-surface-alt);
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
  transform: scale(1.05);
}

.book-format-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(27, 42, 74, 0.88);
  backdrop-filter: blur(8px);
  color: white;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

.book-info {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.book-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
}

.book-author {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.book-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 10px;
}

.book-genre {
  font-size: 0.78rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.book-price {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
}

/* ─── CTA Section ─── */
.cta-section {
  background: var(--color-surface-alt);
  padding: 80px 24px;
  text-align: center;
}

.cta-section h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.cta-section p {
  color: var(--color-text-muted);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ─── Catalog Hero ─── */
.catalog-hero {
  background: var(--color-primary);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.catalog-hero h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.catalog-hero p {
  opacity: 0.8;
  font-size: 1.1rem;
}

/* ─── Filters ─── */
.catalog-section {
  padding: 40px 0 80px;
}

.filters-bar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.filters-form {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 150px;
}

.filter-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-group input,
.filter-group select {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.filter-group input:focus,
.filter-group select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.results-info {
  margin-bottom: 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 80px 20px;
}

.empty-icon { font-size: 3rem; margin-bottom: 16px; }

.empty-state h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.empty-state p { color: var(--color-text-muted); }
.empty-state a { color: var(--color-accent); font-weight: 600; }

/* ─── Book Detail ─── */
.book-detail {
  padding: 40px 0 80px;
}

.back-link {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 32px;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.back-link:hover { color: var(--color-primary); }

.book-detail-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: start;
}

.book-detail-cover {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.book-detail-cover img {
  width: 100%;
  aspect-ratio: 2/3;
  object-fit: cover;
}

.detail-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  top: auto;
  right: auto;
  font-size: 0.85rem;
  padding: 6px 14px;
}

.book-genre-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.book-detail-info h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
}

.book-detail-author {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.book-detail-price {
  margin-bottom: 32px;
}

.price {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
}

.format-options {
  margin-bottom: 32px;
}

.format-options h3,
.book-description h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.format-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.format-option {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--color-surface-alt);
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.format-option .format-icon { font-size: 1.5rem; }

.format-option strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-primary);
}

.format-option p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.book-description p {
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ─── Sample Preview ─── */
.sample-section {
  margin-top: 64px;
}

.sample-section h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.sample-reader {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.sample-header {
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 24px;
}

.sample-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.sample-content {
  padding: 32px;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text);
  max-width: 680px;
}

.sample-content p {
  margin-bottom: 1.2em;
  text-indent: 1.5em;
}

.sample-content p:first-child {
  text-indent: 0;
}

.sample-content p:first-child::first-letter {
  font-family: var(--font-display);
  font-size: 3.2em;
  float: left;
  line-height: 0.8;
  margin-right: 8px;
  margin-top: 4px;
  color: var(--color-primary);
}

/* ─── Related Section ─── */
.related-section {
  margin-top: 64px;
}

.related-section h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 24px;
}

/* ─── Error Page ─── */
.error-page {
  padding: 120px 0;
  text-align: center;
}

.error-content .error-icon { font-size: 4rem; margin-bottom: 20px; }

.error-content h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.error-content p {
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

/* ─── Footer ─── */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-brand .logo-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
}

.footer-tagline {
  width: 100%;
  font-size: 0.85rem;
  margin-top: -4px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover { color: white; }

.footer-copy {
  font-size: 0.82rem;
}

/* ─── Utility ─── */
.hidden { display: none !important; }

/* ═══ FORMAT TOGGLE ═══ */
.format-toggle {
  display: flex;
  gap: 0;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 28px;
  width: fit-content;
}

.format-toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.format-toggle-btn.active {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow);
}

.format-toggle-btn:not(.active):hover {
  color: var(--color-primary);
  background: rgba(27, 42, 74, 0.05);
}

.toggle-icon { font-size: 1.1rem; }

/* ═══ AUDIO PLAYER ═══ */
.player-section {
  margin-top: 48px;
}

.player-section h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.audio-player {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  box-shadow: var(--shadow);
}

.player-info {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 200px;
}

.player-cover {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  box-shadow: var(--shadow);
}

.player-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary);
  line-height: 1.3;
}

.player-author {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.player-controls {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.player-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

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

.player-btn:hover {
  background: var(--color-surface-alt);
}

.player-btn-play {
  width: 52px;
  height: 52px;
  background: var(--color-primary);
  color: white;
}

.player-btn-play:hover {
  background: var(--color-primary-light);
  transform: scale(1.05);
}

.player-progress {
  display: flex;
  align-items: center;
  gap: 12px;
}

.time-current, .time-total {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
}

.time-total { text-align: right; }

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--color-surface-alt);
  border-radius: 3px;
  cursor: pointer;
  position: relative;
  transition: height 0.1s ease;
}

.progress-bar:hover {
  height: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}

.progress-handle {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border: 2px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  opacity: 0;
  transition: opacity var(--transition);
}

.progress-bar:hover .progress-handle {
  opacity: 1;
}

.player-extras {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  min-width: 100px;
}

.speed-btn {
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}

.speed-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.volume-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
}

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

.volume-slider {
  width: 80px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: 2px;
  outline: none;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
}

.volume-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

/* ─── Chapter Navigation ─── */
.chapter-nav {
  margin-top: 20px;
}

.chapter-nav h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  width: 100%;
}

.chapter-item:hover {
  background: var(--color-surface-alt);
}

.chapter-item.active {
  background: var(--color-primary);
  color: white;
}

.chapter-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}

.chapter-item.active .chapter-number {
  background: rgba(255,255,255,0.2);
  color: white;
}

.chapter-title {
  flex: 1;
  font-weight: 500;
}

.chapter-time {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.chapter-item.active .chapter-time {
  color: rgba(255,255,255,0.7);
}

/* ═══ EBOOK READER ═══ */
.reader-section {
  margin-top: 48px;
}

.reader-section h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.reader-toolbar {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 16px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius) var(--radius) 0 0;
  flex-wrap: wrap;
}

.reader-toolbar-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.reader-toolbar-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.font-size-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface-alt);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all var(--transition);
}

.toolbar-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.font-size-display {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
  text-align: center;
}

.theme-controls {
  display: flex;
  gap: 6px;
}

.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  padding: 4px;
  transition: all var(--transition);
}

.theme-btn.active {
  border-color: var(--color-accent);
}

.theme-preview {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 4px;
}

.mode-controls {
  display: flex;
  gap: 0;
  background: var(--color-surface-alt);
  border-radius: 6px;
  padding: 2px;
}

.mode-btn {
  padding: 6px 14px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.mode-btn.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* ─── Reading Progress ─── */
.reading-progress-bar {
  height: 3px;
  background: var(--color-border);
  position: relative;
}

.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  width: 0%;
  transition: width 0.3s ease;
}

.reading-progress-text {
  text-align: right;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: 4px 24px;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
}

/* ─── The Reader ─── */
.ebook-reader {
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 40px;
  max-width: 100%;
  font-size: 18px;
  line-height: 1.9;
  transition: all 0.3s ease;
}

.ebook-reader.mode-scroll {
  max-height: 600px;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.ebook-reader.mode-page {
  height: 600px;
  overflow: hidden;
  position: relative;
}

.reader-content {
  max-width: 680px;
  margin: 0 auto;
  font-family: Georgia, 'Palatino Linotype', 'Book Antiqua', serif;
}

.reader-content p {
  margin-bottom: 1.3em;
  text-indent: 1.5em;
}

.reader-content p:first-child,
.reader-content h2 + p {
  text-indent: 0;
}

.reader-content p:first-child::first-letter,
.reader-content h2 + p::first-letter {
  font-family: var(--font-display);
  font-size: 3.2em;
  float: left;
  line-height: 0.8;
  margin-right: 8px;
  margin-top: 4px;
  color: var(--color-primary);
}

.chapter-heading {
  font-family: var(--font-display);
  font-size: 1.6em;
  color: var(--color-primary);
  margin: 2em 0 1em;
  padding-bottom: 0.5em;
  border-bottom: 2px solid var(--color-border);
  text-indent: 0 !important;
}

.reader-content .chapter-heading:first-child {
  margin-top: 0;
}

/* Reader Themes */
.ebook-reader.theme-light {
  background: #FFFFFF;
  color: #2D2D2D;
}

.ebook-reader.theme-sepia {
  background: #F4ECD8;
  color: #5B4636;
}

.ebook-reader.theme-sepia .chapter-heading {
  color: #5B4636;
  border-bottom-color: #D4C4A8;
}

.ebook-reader.theme-sepia p::first-letter {
  color: #5B4636;
}

.ebook-reader.theme-dark {
  background: #1a1a2e;
  color: #D4D4D4;
}

.ebook-reader.theme-dark .chapter-heading {
  color: #E8C9A0;
  border-bottom-color: #333350;
}

.ebook-reader.theme-dark p::first-letter {
  color: #E8C9A0;
}

/* ─── Page Navigation ─── */
.page-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.page-nav-btn {
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.page-nav-btn:hover:not(:disabled) {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.page-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-indicator {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ═══ PERSISTENT BOTTOM PLAYER ═══ */
.bottom-player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
  z-index: 1000;
  transition: transform 0.3s ease;
}

.bottom-player.hidden {
  transform: translateY(100%);
  display: block !important;
  pointer-events: none;
}

.bottom-player-progress {
  height: 3px;
  background: var(--color-surface-alt);
  cursor: pointer;
}

.bottom-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  width: 0%;
  transition: width 0.1s linear;
}

.bottom-player-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.bottom-player-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bottom-player-cover {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
}

.bottom-player-title {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--color-primary);
}

.bottom-player-author {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.bottom-player-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bottom-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.bottom-btn:hover {
  background: var(--color-surface-alt);
}

.bottom-btn-play {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: white;
}

.bottom-btn-play:hover {
  background: var(--color-primary-light);
}

.bottom-player-time {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 80px;
  text-align: right;
}

/* Add padding to body when bottom player is visible */
body:has(.bottom-player:not(.hidden)) {
  padding-bottom: 70px;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .hero { padding: 60px 20px 80px; }
  .hero-title { font-size: 2rem; }

  .book-detail-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .book-detail-cover {
    max-width: 280px;
    margin: 0 auto;
  }

  .filters-form {
    flex-direction: column;
  }

  .filter-group { min-width: auto; }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  /* Audio Player responsive */
  .audio-player {
    flex-direction: column;
    gap: 16px;
    padding: 18px;
  }

  .player-info {
    min-width: auto;
    width: 100%;
  }

  .player-extras {
    flex-direction: row;
    width: 100%;
    justify-content: center;
  }

  /* Reader toolbar responsive */
  .reader-toolbar {
    gap: 16px;
    padding: 12px 16px;
  }

  .ebook-reader {
    padding: 24px 18px;
  }

  .ebook-reader.mode-scroll,
  .ebook-reader.mode-page {
    max-height: 500px;
    height: 500px;
  }

  /* Bottom player responsive */
  .bottom-player-content {
    padding: 8px 16px;
  }

  .bottom-player-time {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-formats {
    flex-direction: column;
    align-items: center;
  }

  .books-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .book-info { padding: 12px; }
  .book-title { font-size: 0.9rem; }
  .book-author { font-size: 0.8rem; }

  .format-toggle {
    width: 100%;
  }

  .format-toggle-btn {
    flex: 1;
    justify-content: center;
    padding: 10px 16px;
  }

  .reader-toolbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .ebook-reader {
    padding: 20px 14px;
    font-size: 16px;
  }

  .ebook-reader.mode-scroll,
  .ebook-reader.mode-page {
    max-height: 400px;
    height: 400px;
  }
}