/* ============================================
   Responsive Design and Accessibility Enhancements
   ============================================
   
   This stylesheet provides comprehensive responsive design and accessibility
   features for the Enhanced Item Management system.
   
   Requirements: 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8
   
   Table of Contents:
   1. CSS Variables for Responsive Design
   2. Mobile-First Responsive Breakpoints
   3. Tablet Responsive Design
   4. Desktop Responsive Design
   5. Accessibility Features (ARIA, Screen Reader Support)
   6. High-Contrast Mode Support
   7. Reduced-Motion Support
   8. Keyboard Navigation Enhancements
   9. Touch-Friendly Interactions
   10. Print Styles
   ============================================ */

/* ============================================
   1. CSS Variables for Responsive Design
   ============================================ */
:root {
  /* Responsive Breakpoints */
  --bp-mobile: 480px;
  --bp-tablet: 768px;
  --bp-desktop: 1024px;
  --bp-large: 1200px;
  
  /* Responsive Spacing */
  --spacing-mobile: 0.5rem;
  --spacing-tablet: 1rem;
  --spacing-desktop: 1.5rem;
  
  /* Responsive Typography */
  --font-size-xs: clamp(0.7rem, 2vw, 0.8rem);
  --font-size-sm: clamp(0.8rem, 2.5vw, 0.9rem);
  --font-size-base: clamp(0.9rem, 3vw, 1rem);
  --font-size-lg: clamp(1rem, 3.5vw, 1.2rem);
  --font-size-xl: clamp(1.2rem, 4vw, 1.5rem);
  --font-size-xxl: clamp(1.5rem, 5vw, 2rem);
  --font-size-xxxl: clamp(2rem, 6vw, 3rem);
  
  /* Touch Target Sizes */
  --touch-target-min: 44px;
  --touch-target-comfortable: 48px;
  
  /* Accessibility Colors */
  --focus-color: #005fcc;
  --focus-outline: 2px solid var(--focus-color);
  --focus-outline-offset: 2px;
  
  /* High Contrast Colors */
  --hc-bg: #000000;
  --hc-text: #ffffff;
  --hc-border: #ffffff;
  --hc-accent: #ffff00;
}

/* ============================================
   2. Mobile-First Responsive Breakpoints (≤ 480px)
   ============================================ */

/* Mobile styles are applied via media query to avoid overriding base styles */
@media (max-width: 480px) {
  /* Base Mobile Styles */
  .amazon-ext-enhanced-items-content {
    padding: var(--spacing-mobile);
    font-size: var(--font-size-base);
  }

  /* Mobile Header */
  .enhanced-items-header {
    margin-bottom: var(--spacing-tablet);
    text-align: center;
  }

  .enhanced-items-header h2 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-mobile);
    line-height: 1.2;
  }

  /* Mobile Form Layout */
  .add-enhanced-item-form {
    flex-direction: column;
    gap: var(--spacing-mobile);
    padding: var(--spacing-mobile);
  }

  .enhanced-url-input {
    width: 100%;
    min-height: var(--touch-target-min);
    font-size: var(--font-size-base);
    padding: 0.75rem;
  }

  .extract-btn {
    width: 100%;
    min-height: var(--touch-target-comfortable);
    font-size: var(--font-size-base);
    padding: 0.75rem;
    touch-action: manipulation;
  }

  /* Mobile Item Cards */
  .enhanced-item {
    flex-direction: column;
    padding: var(--spacing-mobile);
    gap: var(--spacing-mobile);
  }

  .item-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-mobile);
  }

  .item-custom-title {
    font-size: var(--font-size-lg);
    line-height: 1.3;
    word-break: break-word;
    hyphens: auto;
  }

  .price {
    font-size: var(--font-size-base);
    padding: 0.5rem 0.75rem;
    align-self: flex-start;
  }

  /* Mobile Item Actions */
  .item-actions {
    flex-direction: column;
    width: 100%;
    gap: var(--spacing-mobile);
  }

  .item-actions button {
    width: 100%;
    min-height: var(--touch-target-min);
    font-size: var(--font-size-sm);
    padding: 0.75rem;
    touch-action: manipulation;
  }

  /* Mobile Progress Indicator */
  .progress-steps {
    gap: var(--spacing-mobile);
  }

  .progress-step {
    padding: var(--spacing-mobile);
    font-size: var(--font-size-sm);
  }

  .step-icon {
    font-size: 1.2rem;
    width: 1.5rem;
    height: 1.5rem;
  }

  /* Mobile Title Selection */
  .title-selection-container {
    padding: var(--spacing-mobile);
    margin: var(--spacing-mobile) 0;
  }

  .title-option {
    padding: var(--spacing-mobile);
    min-height: var(--touch-target-min);
    touch-action: manipulation;
  }

  .option-text {
    font-size: var(--font-size-base);
    line-height: 1.4;
    word-break: break-word;
    hyphens: auto;
  }

  .selection-actions {
    flex-direction: column;
    gap: var(--spacing-mobile);
  }

  .confirm-selection-btn,
  .skip-ai-btn {
    width: 100%;
    min-height: var(--touch-target-comfortable);
    font-size: var(--font-size-base);
    touch-action: manipulation;
  }

  /* Mobile Modals */
  .edit-modal,
  .manual-input-form {
    width: 95vw;
    max-width: none;
    margin: var(--spacing-mobile);
    max-height: 90vh;
  }

  .edit-modal-header,
  .form-header {
    padding: var(--spacing-mobile);
  }

  .edit-modal-content,
  .form-content {
    padding: var(--spacing-mobile);
    gap: var(--spacing-mobile);
  }

  .edit-modal-footer,
  .form-actions {
    flex-direction: column;
    gap: var(--spacing-mobile);
    padding: var(--spacing-mobile);
  }

  .save-changes-btn,
  .cancel-edit-btn,
  .save-manual-btn,
  .cancel-manual-btn {
    width: 100%;
    min-height: var(--touch-target-comfortable);
    touch-action: manipulation;
  }
}

/* ============================================
   3. Tablet Responsive Design (481px - 768px)
   ============================================ */
@media (min-width: 481px) and (max-width: 768px) {
  .amazon-ext-enhanced-items-content {
    padding: var(--spacing-tablet);
  }
  
  .enhanced-items-header h2 {
    font-size: var(--font-size-xxxl);
  }
  
  /* Tablet Form Layout */
  .add-enhanced-item-form {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-tablet);
    padding: var(--spacing-tablet);
  }
  
  .enhanced-url-input {
    flex: 1;
    min-width: 250px;
  }
  
  .extract-btn {
    flex-shrink: 0;
    width: auto;
    min-width: 120px;
  }
  
  /* Tablet Item Cards */
  .enhanced-item {
    flex-direction: row;
    padding: var(--spacing-tablet);
    gap: var(--spacing-tablet);
  }
  
  .item-header {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-tablet);
  }
  
  .item-custom-title {
    font-size: var(--font-size-xl);
  }
  
  /* Tablet Item Actions */
  .item-actions {
    flex-direction: column;
    width: auto;
    min-width: 140px;
  }
  
  .item-actions button {
    width: 100%;
  }
  
  /* Tablet Title Selection */
  .title-selection-container {
    padding: var(--spacing-tablet);
  }
  
  .title-option {
    padding: var(--spacing-tablet);
  }
  
  .selection-actions {
    flex-direction: row;
    justify-content: center;
  }
  
  .confirm-selection-btn,
  .skip-ai-btn {
    width: auto;
    min-width: 140px;
  }
  
  /* Tablet Modals */
  .edit-modal,
  .manual-input-form {
    width: 90vw;
    max-width: 600px;
  }
  
  .edit-modal-footer,
  .form-actions {
    flex-direction: row;
    justify-content: flex-end;
  }
  
  .save-changes-btn,
  .cancel-edit-btn,
  .save-manual-btn,
  .cancel-manual-btn {
    width: auto;
    min-width: 120px;
  }
}

/* ============================================
   4. Desktop Responsive Design (≥ 769px)
   ============================================ */
@media (min-width: 769px) {
  .amazon-ext-enhanced-items-content {
    padding: var(--spacing-desktop);
  }
  
  .enhanced-items-header {
    text-align: left;
  }
  
  .enhanced-items-header h2 {
    font-size: var(--font-size-xxxl);
  }
  
  /* Desktop Form Layout */
  .add-enhanced-item-form {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-desktop);
    padding: var(--spacing-desktop);
  }
  
  .enhanced-url-input {
    flex: 1;
    min-width: 300px;
  }
  
  .extract-btn {
    width: auto;
    min-width: 140px;
  }
  
  /* Desktop Item Cards */
  .enhanced-item {
    flex-direction: row;
    padding: var(--spacing-desktop);
    gap: var(--spacing-desktop);
  }
  
  .item-header {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-desktop);
  }
  
  .item-custom-title {
    font-size: var(--font-size-xl);
  }
  
  /* Desktop Item Actions */
  .item-actions {
    flex-direction: column;
    width: auto;
    min-width: 160px;
  }
  
  /* Desktop Title Selection */
  .title-selection-container {
    padding: var(--spacing-desktop);
    max-width: 800px;
  }
  
  .title-option {
    padding: var(--spacing-desktop);
  }
  
  .selection-actions {
    flex-direction: row;
    justify-content: center;
  }
  
  /* Desktop Modals */
  .edit-modal,
  .manual-input-form {
    width: 80vw;
    max-width: 700px;
  }
}

/* Large Desktop (≥ 1200px) */
@media (min-width: 1200px) {
  .amazon-ext-enhanced-items-content {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .enhanced-item {
    max-width: 100%;
  }
  
  .title-selection-container {
    max-width: 900px;
  }
  
  .edit-modal,
  .manual-input-form {
    max-width: 800px;
  }
}

/* ============================================
   5. Accessibility Features (ARIA, Screen Reader Support)
   ============================================ */

/* Screen Reader Only Content */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Skip Links */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--eip-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 100000;
  font-weight: 600;
}

.skip-link:focus {
  top: 6px;
}

/* Enhanced Focus Indicators */
*:focus {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

/* Remove outline for mouse users, keep for keyboard users */
*:focus:not(:focus-visible) {
  outline: none;
}

*:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

/* Enhanced Button Focus */
button:focus-visible,
.extract-btn:focus-visible,
.item-actions button:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
  box-shadow: 0 0 0 4px rgba(0, 95, 204, 0.2);
}

/* Enhanced Input Focus */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
  box-shadow: 0 0 0 4px rgba(0, 95, 204, 0.15);
}

/* Enhanced Interactive Element Focus */
.title-option:focus-visible,
.enhanced-item:focus-within {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

/* Required Field Indicators */
.required::after {
  content: " *";
  color: var(--eip-error);
  font-weight: bold;
  margin-left: 0.25rem;
}

/* Error State Indicators */
.error {
  border-color: var(--eip-error) !important;
  box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.2) !important;
}

.error + .error-message {
  display: block;
  color: var(--eip-error);
  font-size: var(--font-size-sm);
  margin-top: 0.25rem;
}

/* Success State Indicators */
.success {
  border-color: var(--eip-success) !important;
  box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.2) !important;
}

/* Loading State Indicators */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--eip-primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ARIA Live Regions */
.live-region {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Enhanced Form Labels */
label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--eip-text-primary);
}

label.inline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: normal;
}

/* Form Field Groups */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

/* Fieldset Styling */
fieldset {
  border: 1px solid var(--eip-glass-border);
  border-radius: var(--eip-radius-lg);
  padding: var(--spacing-tablet);
  margin-bottom: 1.5rem;
}

legend {
  font-weight: 700;
  color: var(--eip-text-primary);
  padding: 0 0.5rem;
}

/* ============================================
   6. High-Contrast Mode Support
   ============================================ */
@media (prefers-contrast: high) {
  :root {
    --eip-bg-dark: var(--hc-bg);
    --eip-bg-card: var(--hc-bg);
    --eip-text-primary: var(--hc-text);
    --eip-text-secondary: var(--hc-text);
    --eip-border: var(--hc-border);
    --eip-primary: var(--hc-accent);
    --eip-secondary: var(--hc-accent);
  }
  
  .amazon-ext-enhanced-items-content {
    background: var(--hc-bg);
    color: var(--hc-text);
  }
  
  .enhanced-item {
    background: var(--hc-bg);
    border: 2px solid var(--hc-border);
    color: var(--hc-text);
  }
  
  .enhanced-item:hover {
    background: var(--hc-bg);
    border-color: var(--hc-accent);
  }
  
  .enhanced-url-input {
    background: var(--hc-bg);
    border: 2px solid var(--hc-border);
    color: var(--hc-text);
  }
  
  .enhanced-url-input:focus {
    border-color: var(--hc-accent);
    box-shadow: 0 0 0 4px var(--hc-accent);
  }
  
  .extract-btn {
    background: var(--hc-accent);
    color: var(--hc-bg);
    border: 2px solid var(--hc-accent);
  }
  
  .extract-btn:hover {
    background: var(--hc-bg);
    color: var(--hc-accent);
  }
  
  .price {
    background: var(--hc-accent);
    color: var(--hc-bg);
    border: 2px solid var(--hc-accent);
  }
  
  .item-actions button {
    background: var(--hc-bg);
    border: 2px solid var(--hc-border);
    color: var(--hc-text);
  }
  
  .item-actions button:hover {
    background: var(--hc-accent);
    color: var(--hc-bg);
    border-color: var(--hc-accent);
  }
  
  .title-option {
    background: var(--hc-bg);
    border: 2px solid var(--hc-border);
    color: var(--hc-text);
  }
  
  .title-option:hover,
  .title-option.selected {
    background: var(--hc-bg);
    border-color: var(--hc-accent);
    color: var(--hc-text);
  }
  
  .progress-step {
    background: var(--hc-bg);
    border: 2px solid var(--hc-border);
    color: var(--hc-text);
  }
  
  .progress-step.active {
    border-color: var(--hc-accent);
    color: var(--hc-accent);
  }
  
  .error-message {
    background: var(--hc-bg);
    color: var(--hc-text);
    border: 2px solid var(--hc-text);
  }
  
  .success-message {
    background: var(--hc-bg);
    color: var(--hc-text);
    border: 2px solid var(--hc-text);
  }
}

/* ============================================
   7. Reduced-Motion Support
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  /* Remove hover transforms */
  .enhanced-item:hover,
  .extract-btn:hover,
  .item-actions button:hover,
  .title-option:hover,
  .price:hover {
    transform: none !important;
  }
  
  /* Remove loading animations */
  .loading::after {
    animation: none !important;
    border: 2px solid var(--eip-primary);
  }
  
  /* Remove progress animations */
  .progress-step.active .step-icon,
  .loading-indicator::before {
    animation: none !important;
  }
  
  /* Remove floating animations */
  .empty-icon {
    animation: none !important;
  }
}

/* ============================================
   8. Keyboard Navigation Enhancements
   ============================================ */

/* Tab Order Management */
.tab-trap {
  position: relative;
}

.tab-trap:focus-within {
  outline: 2px solid var(--focus-color);
  outline-offset: 4px;
}

/* Enhanced Keyboard Navigation for Item Cards */
.enhanced-item {
  position: relative;
}

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

/* Keyboard Navigation for Title Selection */
.title-options {
  role: radiogroup;
}

.title-option {
  cursor: pointer;
  position: relative;
}

.title-option[aria-selected="true"] {
  border-color: var(--eip-secondary);
  background: rgba(0, 122, 204, 0.1);
}

/* Keyboard Shortcuts Display */
.keyboard-shortcut {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--font-size-xs);
  color: var(--eip-text-muted);
  margin-left: auto;
}

.kbd {
  background: var(--eip-glass-bg);
  border: 1px solid var(--eip-glass-border);
  border-radius: 3px;
  padding: 0.1rem 0.3rem;
  font-family: monospace;
  font-size: 0.8em;
  font-weight: 600;
  color: var(--eip-text-primary);
  min-width: 1.5em;
  text-align: center;
}

/* Enhanced Modal Keyboard Navigation */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

/* Focus Management for Modals */
.modal-content:focus {
  outline: none;
}

.modal-header .close-btn:focus {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

/* ============================================
   9. Touch-Friendly Interactions
   ============================================ */

/* Touch Target Sizing */
button,
.extract-btn,
.item-actions button,
.title-option,
input,
select,
textarea {
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
}

/* Comfortable Touch Targets for Primary Actions */
.extract-btn,
.confirm-selection-btn,
.save-changes-btn,
.save-manual-btn {
  min-height: var(--touch-target-comfortable);
}

/* Touch Feedback */
button:active,
.extract-btn:active,
.item-actions button:active,
.title-option:active {
  transform: scale(0.98);
  transition: transform 0.1s ease;
}

/* Prevent Touch Callouts */
button,
.extract-btn,
.item-actions button,
.title-option {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

/* Touch Scroll Improvements */
.amazon-ext-enhanced-items-content,
.edit-modal-content,
.form-content {
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* Swipe Gestures (for future enhancement) */
.swipe-container {
  touch-action: pan-x pan-y;
  overflow: hidden;
}

/* ============================================
   10. Print Styles
   ============================================ */
@media print {
  /* Reset colors for print */
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  /* Hide interactive elements */
  .add-enhanced-item-form,
  .extraction-progress,
  .item-actions,
  .edit-modal-overlay,
  .manual-input-form-container,
  .title-selection-container,
  button,
  .extract-btn {
    display: none !important;
  }
  
  /* Optimize layout for print */
  .amazon-ext-enhanced-items-content {
    padding: 0;
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .enhanced-items-header h2 {
    font-size: 18pt;
    margin-bottom: 12pt;
    border-bottom: 1pt solid black;
    padding-bottom: 6pt;
  }
  
  .enhanced-item {
    border: 1pt solid black;
    margin-bottom: 12pt;
    padding: 12pt;
    break-inside: avoid;
    page-break-inside: avoid;
  }
  
  .item-custom-title {
    font-size: 14pt;
    font-weight: bold;
    margin-bottom: 6pt;
  }
  
  .price {
    font-size: 12pt;
    font-weight: bold;
    background: none;
    border: 1pt solid black;
    padding: 3pt 6pt;
    display: inline-block;
  }
  
  .item-url {
    font-size: 10pt;
    word-break: break-all;
  }
  
  .created-date {
    font-size: 10pt;
    font-style: italic;
  }
  
  /* Print page breaks */
  .enhanced-item:nth-child(3n) {
    page-break-after: always;
  }
  
  /* Print headers and footers */
  @page {
    margin: 1in;
    @top-center {
      content: "Enhanced Items List";
      font-size: 10pt;
    }
    @bottom-center {
      content: counter(page);
      font-size: 10pt;
    }
  }
}

/* ============================================
   Additional Responsive Utilities
   ============================================ */

/* Responsive Text Utilities */
.text-responsive {
  font-size: var(--font-size-base);
}

.text-responsive-sm {
  font-size: var(--font-size-sm);
}

.text-responsive-lg {
  font-size: var(--font-size-lg);
}

/* Responsive Spacing Utilities */
.spacing-responsive {
  padding: var(--spacing-mobile);
}

@media (min-width: 481px) {
  .spacing-responsive {
    padding: var(--spacing-tablet);
  }
}

@media (min-width: 769px) {
  .spacing-responsive {
    padding: var(--spacing-desktop);
  }
}

/* Responsive Visibility Utilities */
.mobile-only {
  display: block;
}

.tablet-up {
  display: none;
}

.desktop-up {
  display: none;
}

@media (min-width: 481px) {
  .mobile-only {
    display: none;
  }
  
  .tablet-up {
    display: block;
  }
}

@media (min-width: 769px) {
  .desktop-up {
    display: block;
  }
}

/* Responsive Grid Utilities */
.responsive-grid {
  display: grid;
  gap: var(--spacing-mobile);
  grid-template-columns: 1fr;
}

@media (min-width: 481px) {
  .responsive-grid {
    gap: var(--spacing-tablet);
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

@media (min-width: 769px) {
  .responsive-grid {
    gap: var(--spacing-desktop);
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

/* Responsive Flex Utilities */
.responsive-flex {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-mobile);
}

@media (min-width: 481px) {
  .responsive-flex {
    flex-direction: row;
    gap: var(--spacing-tablet);
  }
}

@media (min-width: 769px) {
  .responsive-flex {
    gap: var(--spacing-desktop);
  }
}