/* 
 * Enhanced Reader Styles - WCAG 2.2 Level AA Compliant
 * Building on accessibility.css foundation
 */

/* Import base accessibility styles */
@import url('./accessibility.css');

/* Reader-specific custom properties */
: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);
  --reader-zoom-increment: 0.25;
  --reader-animation-duration: var(--transition-normal);
}

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

/* Skip Navigation */
.reader-app::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  z-index: var(--z-tooltip);
}

/* Main Navigation Skip Link */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: var(--spacing-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-to-main:focus {
  top: var(--spacing-md);
}

/* 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: var(--z-sticky);
}

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

/* Accessibility Controls */
.accessibility-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.accessibility-menu {
  position: relative;
}

.accessibility-menu-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: none;
  border: 2px solid var(--color-border-medium);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
}

.accessibility-menu-button:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--color-focus-shadow);
}

.accessibility-menu-button[aria-expanded="true"] {
  background: var(--color-bg-tertiary);
}

.accessibility-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 280px;
  background: var(--color-bg-primary);
  border: 2px solid var(--color-border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  margin-top: var(--spacing-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.accessibility-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.accessibility-dropdown-content {
  padding: var(--spacing-md);
}

.accessibility-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.accessibility-option:last-child {
  border-bottom: none;
}

.accessibility-option label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  cursor: pointer;
  flex: 1;
}

/* Toggle Switch for Accessibility Options */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-border-medium);
  transition: var(--transition-fast);
  border-radius: 24px;
  border: 2px solid var(--color-border-medium);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 2px;
  bottom: 2px;
  background-color: var(--color-bg-primary);
  transition: var(--transition-fast);
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(24px);
}

.toggle-switch input:focus + .toggle-slider {
  box-shadow: 0 0 0 4px var(--color-focus-shadow);
  outline: 2px solid var(--color-focus);
}

/* Font Size Controls */
.font-size-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.font-size-display {
  min-width: 60px;
  text-align: center;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
}

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

/* Sidebar Base Styles */
.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(--reader-animation-duration);
  position: relative;
  z-index: var(--z-sticky);
}

.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: 32px;
  height: 32px;
  padding: 0;
  background: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  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;
  box-shadow: 0 0 0 4px var(--color-focus-shadow);
}

.reader-sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-md);
}

/* Table of Contents */
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-item {
  margin-bottom: var(--spacing-xs);
}

.toc-link {
  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);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  word-wrap: break-word;
  hyphens: auto;
}

.toc-link:hover {
  background: var(--color-hover);
  border-color: var(--color-border-medium);
  text-decoration: none;
}

.toc-link:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--color-focus-shadow);
}

.toc-link.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: var(--font-weight-medium);
}

.toc-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: var(--font-weight-medium);
}

/* TOC Hierarchy */
.toc-level-0 {
  padding-left: var(--spacing-md);
  font-weight: var(--font-weight-semibold);
}

.toc-level-1 {
  padding-left: calc(var(--spacing-md) + var(--spacing-lg));
}

.toc-level-2 {
  padding-left: calc(var(--spacing-md) + var(--spacing-xl));
}

.toc-level-3 {
  padding-left: calc(var(--spacing-md) + var(--spacing-xxl));
}

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

/* Reader Toolbar */
.reader-toolbar {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  min-height: 56px;
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: var(--color-border-light);
  margin: 0 var(--spacing-xs);
}

/* Navigation Controls */
.page-navigation {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--color-bg-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

.page-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  white-space: nowrap;
}

.page-input {
  width: 60px;
  text-align: center;
  padding: var(--spacing-xs);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.page-input:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

/* Zoom Controls */
.zoom-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--color-bg-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

.zoom-display {
  min-width: 50px;
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* 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);
}

/* Page Loading State */
.page-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  color: var(--color-text-secondary);
}

.page-loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border-light);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

.page-loading-text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

/* Error States */
.page-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  padding: var(--spacing-xl);
  text-align: center;
}

.page-error-icon {
  font-size: 48px;
  color: var(--color-error);
  margin-bottom: var(--spacing-md);
}

.page-error-message {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.page-error-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* Status Bar */
.reader-status-bar {
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: between;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.status-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
}

.status-indicator.error {
  background: var(--color-error);
}

.status-indicator.warning {
  background: var(--color-warning);
}

/* Annotation Tools (if applicable) */
.annotation-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: var(--z-base);
}

.annotation-marker {
  position: absolute;
  pointer-events: auto;
  cursor: pointer;
  border-radius: var(--radius-sm);
  min-width: 24px;
  min-height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  background: var(--color-primary);
  border: 2px solid var(--color-bg-primary);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.annotation-marker:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.annotation-marker:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--color-focus-shadow);
}

/* Keyboard Shortcuts Help */
.keyboard-shortcuts {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-bg-primary);
  border: 2px solid var(--color-border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-xl);
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  z-index: var(--z-modal);
}

.keyboard-shortcuts h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

.shortcut-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.shortcut-item:last-child {
  border-bottom: none;
}

.shortcut-description {
  color: var(--color-text-primary);
}

.shortcut-keys {
  display: flex;
  gap: var(--spacing-xs);
}

.shortcut-key {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

/* Modal Backdrop */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .reader-sidebar {
    position: fixed;
    top: var(--reader-toolbar-height);
    bottom: 0;
    left: 0;
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-xl);
  }
  
  .accessibility-dropdown {
    position: fixed;
    top: auto;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
    width: auto;
    min-width: auto;
  }
  
  .reader-toolbar {
    flex-wrap: wrap;
    min-height: auto;
    padding: var(--spacing-sm);
  }
  
  .toolbar-section {
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  :root {
    --reader-sidebar-width: 100vw;
    --reader-content-padding: var(--spacing-md);
  }
  
  .reader-toolbar {
    gap: var(--spacing-xs);
  }
  
  .page-navigation {
    order: 1;
    width: 100%;
    justify-content: center;
  }
  
  .zoom-controls {
    order: 2;
  }
  
  .keyboard-shortcuts {
    margin: var(--spacing-md);
    max-width: calc(100vw - var(--spacing-xl));
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .reader-header {
    padding: 0 var(--spacing-sm);
  }
  
  .reader-header h1 {
    font-size: var(--font-size-base);
  }
  
  .accessibility-menu-button {
    padding: var(--spacing-xs);
    min-width: 40px;
    min-height: 40px;
  }
  
  .page-input {
    width: 50px;
  }
  
  .zoom-display {
    min-width: 40px;
    font-size: var(--font-size-xs);
  }
}

/* Print Styles */
@media print {
  .reader-header,
  .reader-toolbar,
  .reader-sidebar,
  .reader-status-bar,
  .accessibility-controls {
    display: none !important;
  }
  
  .reader-content {
    margin: 0;
    padding: 0;
    background: white;
  }
  
  .page-container {
    box-shadow: none;
    border: 1px solid #000;
    margin-bottom: 20px;
    page-break-inside: avoid;
  }
  
  .page-image {
    max-width: 100%;
    height: auto;
  }
}

/* High Contrast Adjustments */
@media (prefers-contrast: high) {
  .reader-sidebar,
  .reader-toolbar,
  .page-container {
    border-width: 3px;
  }
  
  .toc-link:hover,
  .btn:hover {
    border-width: 3px;
  }
  
  .annotation-marker {
    border-width: 3px;
  }
}

/* Reduced Motion Adjustments */
@media (prefers-reduced-motion: reduce) {
  .reader-sidebar {
    transition: none;
  }
  
  .accessibility-dropdown {
    transition: none;
  }
  
  .page-loading-spinner {
    animation: none;
    border: 4px solid var(--color-primary);
  }
  
  .page-loading-spinner::after {
    content: "Loading...";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
  }
  
  .annotation-marker:hover {
    transform: none;
  }
}