/* Enhanced Reader Styles - WCAG 2.2 Compliant */
:root {
  --reader-sidebar-width: 320px;
  --reader-toolbar-height: 60px;
  --reader-content-padding: var(--spacing-lg);
  --reader-page-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Main Reader Layout */
.reader-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--color-bg-secondary);
}

/* Reader Header */
.reader-header {
  background: var(--color-bg-primary);
  border-bottom: 2px solid var(--color-border-light);
  padding: 0 var(--spacing-md);
  height: var(--reader-toolbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  position: relative;
  z-index: 1020;
}

.reader-header h1 {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* Navigation Button */
.nav-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  min-height: 44px;
  transition: background-color var(--transition-fast);
}

.nav-button:hover {
  background: var(--color-primary-dark);
}

.nav-button:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.nav-button:disabled {
  background: var(--color-border-medium);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Book Title */
.book-title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* Reader Main Content */
.reader-main {
  display: flex;
  flex: 1;
  min-height: 0;
  position: relative;
}

/* Sidebar */
.reader-sidebar {
  width: var(--reader-sidebar-width);
  background: var(--color-bg-primary);
  border-right: 2px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateX(-100%);
  transition: transform var(--transition-fast);
  position: relative;
  z-index: 1010;
}

.reader-sidebar.open {
  transform: translateX(0);
}

.reader-sidebar-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.reader-sidebar-title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.sidebar-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  transition: all var(--transition-fast);
}

.sidebar-close-btn:hover {
  background: var(--color-hover);
  color: var(--color-text-primary);
}

.sidebar-close-btn:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Tab Container */
.tab-container {
  display: flex;
  border-bottom: 1px solid var(--color-border-light);
}

.tab-button {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.tab-button:hover {
  color: var(--color-text-primary);
  background: var(--color-hover);
}

.tab-button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-bg-secondary);
}

.tab-panel {
  display: none;
  padding: var(--spacing-md);
  flex: 1;
  overflow-y: auto;
}

.tab-panel.active {
  display: block;
}

/* TOC Container */
.toc-container {
  padding: var(--spacing-sm) 0;
}

.toc-item {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
}

.toc-item:hover {
  background: var(--color-hover);
  border-color: var(--color-border-medium);
}

.toc-item:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Thumbnails Grid */
.thumbnails-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--spacing-sm);
}

.thumbnail {
  cursor: pointer;
  border: 2px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.thumbnail:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.thumbnail-text {
  padding: var(--spacing-xs);
  font-size: var(--font-size-xs);
  text-align: center;
  background: var(--color-bg-secondary);
}

/* Print Controls */
.print-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.print-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  transition: background var(--transition-fast);
  min-height: 44px;
}

.print-btn:hover {
  background: var(--color-primary-dark);
}

.print-range-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.print-range-controls label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.print-range-controls input {
  padding: var(--spacing-xs);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  min-height: 44px;
}

/* Reader Content Area */
.reader-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-secondary);
  min-width: 0;
  position: relative;
}

/* Page Display Area */
.page-display {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--reader-content-padding);
  overflow: auto;
  background: var(--color-bg-secondary);
  position: relative;
}

.page-container {
  position: relative;
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--reader-page-shadow);
  overflow: hidden;
  max-width: 100%;
  max-height: 100%;
}

.page-image {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

/* Navigation Controls */
.nav-controls {
  background: var(--color-bg-primary);
  border-top: 2px solid var(--color-border-light);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.nav-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  transition: background var(--transition-fast);
  min-height: 44px;
}

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

.nav-btn:disabled {
  background: var(--color-border-medium);
  cursor: not-allowed;
  opacity: 0.6;
}

.page-input-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.page-input-group input {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  text-align: center;
  min-width: 80px;
  min-height: 44px;
}

.page-input-group input:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-color: var(--color-primary);
}

.jump-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-height: 44px;
}

.jump-btn:hover {
  background: var(--color-hover);
}

/* Responsive Design */
@media (max-width: 768px) {
  .reader-sidebar {
    position: fixed;
    top: var(--reader-toolbar-height);
    bottom: 0;
    left: 0;
    z-index: 1030;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  }
  
  .reader-header {
    padding: 0 var(--spacing-sm);
  }
  
  .nav-controls {
    padding: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .page-input-group {
    order: -1;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --reader-sidebar-width: 100vw;
  }
  
  .reader-header h1 {
    font-size: var(--font-size-base);
  }
  
  .tab-button {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
  }
}

/* Print Styles */
@media print {
  .reader-header,
  .reader-sidebar,
  .nav-controls {
    display: none !important;
  }
  
  .reader-content {
    margin: 0;
    padding: 0;
  }
  
  .page-container {
    box-shadow: none;
    border: 1px solid #000;
  }
}