/**
 * WCAG 2.1 AAA Accessibility Styles
 * Comprehensive accessibility enhancements
 */

/* ==========================================================================
   FOCUS MANAGEMENT & VISIBILITY
   ========================================================================== */

/* Enhanced focus indicators for WCAG AAA compliance */
:focus-visible {
  outline: 3px solid var(--color-accent, #00ff9f);
  outline-offset: 3px;
  border-radius: var(--radius-sm, 0.375rem);
  box-shadow: 
    0 0 0 1px var(--color-bg, white),
    0 0 12px var(--color-accent, #00ff9f);
  transition: outline-color 0.15s ease, box-shadow 0.15s ease;
}

/* Remove default focus styles when focus-visible is supported */
:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* High contrast focus indicators */
@media (forced-colors: active) {
  :focus-visible {
    outline: 4px solid Highlight !important;
    outline-offset: 4px !important;
    box-shadow: none !important;
  }
}

/* Enhanced focus for interactive elements */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[role="button"]:focus-visible,
[role="link"]:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-accent, #00ff9f);
  outline-offset: 3px;
  box-shadow: 
    0 0 0 1px var(--color-bg, white),
    0 0 16px rgba(0, 255, 159, 0.4);
  transform: translateY(-1px);
}

/* Keyboard user specific focus enhancements */
.keyboard-user *:focus {
  outline: 3px solid var(--color-accent, #00ff9f) !important;
  outline-offset: 3px !important;
  box-shadow: 
    0 0 0 1px var(--color-bg, white),
    0 0 16px rgba(0, 255, 159, 0.4) !important;
}

/* Mouse user subtle focus */
.mouse-user *:focus {
  outline: 2px solid var(--color-primary, #0066ff);
  outline-offset: 2px;
  box-shadow: 
    0 0 0 1px var(--color-bg, white),
    0 0 8px rgba(0, 102, 255, 0.3);
}

/* ==========================================================================
   TOUCH TARGETS & MINIMUM SIZES
   ========================================================================== */

/* Ensure all interactive elements meet 44x44px minimum */
button,
a,
input[type="checkbox"],
input[type="radio"],
select,
.btn,
.link-badge,
.nav-link,
.theme-toggle,
.pronunciation-audio,
[role="button"],
[role="link"] {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: max(8px, 0.5rem);
  touch-action: manipulation;
}

/* Exception for text links in paragraphs */
p a,
li a,
.text-content a {
  min-height: auto;
  min-width: auto;
  display: inline;
  padding: 2px 0;
}

/* Form elements sizing */
input:not([type="checkbox"]):not([type="radio"]),
textarea,
select {
  min-height: 44px;
  padding: 12px 16px;
  font-size: 16px; /* Prevents zoom on iOS */
}

/* ==========================================================================
   SKIP LINKS & NAVIGATION
   ========================================================================== */

/* Enhanced skip links */
.skip-links {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary, #0066ff);
  color: white;
  padding: var(--space-sm, 0.5rem);
  z-index: 9999;
  display: flex;
  gap: var(--space-md, 1rem);
  border-radius: var(--radius-md, 0.5rem);
  box-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0,0,0,0.1));
}

.skip-link {
  color: white;
  text-decoration: none;
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  border-radius: var(--radius-md, 0.5rem);
  background: rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast, 150ms ease);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-weight: 600;
}

.skip-link:focus {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10000;
  outline: 3px solid var(--color-accent, #00ff9f);
  outline-offset: 3px;
  background: var(--color-primary, #0066ff);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transform: translateY(0);
  font-size: 1rem;
}

/* ==========================================================================
   SCREEN READER SUPPORT
   ========================================================================== */

/* Visually hidden but accessible to screen readers */
.visually-hidden,
.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;
}

/* Make visually hidden elements focusable */
.visually-hidden:focus,
.sr-only:focus {
  position: static !important;
  width: auto !important;
  height: auto !important;
  margin: 0 !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Screen reader only content that should be announced */
.sr-only-focusable:not(:focus):not(:focus-within) {
  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;
}

/* ==========================================================================
   COLOR CONTRAST & HIGH CONTRAST MODE
   ========================================================================== */

/* Enhanced contrast for WCAG AAA (7:1 ratio) */
:root {
  --contrast-text: #000000;
  --contrast-bg: #ffffff;
  --contrast-primary: #003d82;
  --contrast-secondary: #2d3748;
  --contrast-accent: #0066cc;
  --contrast-error: #c53030;
  --contrast-success: #2f855a;
  --contrast-warning: #d69e2e;
}

[data-theme="dark"] {
  --contrast-text: #ffffff;
  --contrast-bg: #000000;
  --contrast-primary: #66a3ff;
  --contrast-secondary: #e2e8f0;
  --contrast-accent: #00ccff;
  --contrast-error: #fc8181;
  --contrast-success: #68d391;
  --contrast-warning: #f6e05e;
}

/* High contrast mode overrides */
@media (forced-colors: active) {
  * {
    color: CanvasText !important;
    background-color: Canvas !important;
    border-color: CanvasText !important;
  }
  
  a,
  button,
  [role="button"],
  [role="link"] {
    color: LinkText !important;
    background-color: Canvas !important;
    border: 2px solid LinkText !important;
  }
  
  a:hover,
  a:focus,
  button:hover,
  button:focus,
  [role="button"]:hover,
  [role="button"]:focus {
    color: HighlightText !important;
    background-color: Highlight !important;
    border-color: Highlight !important;
  }
  
  .hero-name,
  .gradient-text {
    background: none !important;
    -webkit-background-clip: initial !important;
    background-clip: initial !important;
    -webkit-text-fill-color: initial !important;
    color: CanvasText !important;
  }
}

/* High contrast focus indicators */
@media (forced-colors: active) {
  :focus-visible {
    outline: 4px solid Highlight !important;
    outline-offset: 2px !important;
  }
}

/* Enhanced contrast for specific elements */
.high-contrast {
  --color-text: var(--contrast-text);
  --color-bg: var(--contrast-bg);
  --color-primary: var(--contrast-primary);
  --color-secondary: var(--contrast-secondary);
}

/* ==========================================================================
   MOTION & ANIMATION PREFERENCES
   ========================================================================== */

/* Respect reduced motion preference */
@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;
  }
  
  /* Specific elements that should have no animation */
  .hero-gradient,
  .hero-mesh,
  .parallax-element,
  .shape,
  .pulse,
  .fade-in,
  .slide-in {
    animation: none !important;
    transform: none !important;
  }
  
  /* Maintain essential transitions for focus states */
  :focus-visible {
    transition: outline-color 0.01ms, box-shadow 0.01ms !important;
  }
}

/* Safe animation fallbacks */
.motion-safe {
  animation-duration: var(--safe-animation-duration, 0.01ms);
  transition-duration: var(--safe-transition-duration, 0.01ms);
}

/* ==========================================================================
   FORM ACCESSIBILITY
   ========================================================================== */

/* Enhanced form styling */
.form-group {
  margin-bottom: 1.5rem;
  position: relative;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  font-size: 1rem;
}

.form-label .required {
  color: var(--color-error, #c53030);
  margin-left: 0.25rem;
  font-weight: 700;
  speak: literal; /* Screen readers should say "asterisk" */
}

/* Form input styling */
.form-input,
.form-textarea,
.form-select {
  width: 100%;
  min-height: 44px;
  padding: 12px 16px;
  border: 2px solid var(--color-border, rgba(0,0,0,0.1));
  border-radius: var(--radius-md, 0.5rem);
  background: var(--color-bg, white);
  color: var(--color-text);
  font-size: 16px; /* Prevents zoom on iOS */
  line-height: 1.5;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary, #0066ff);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

/* Invalid state styling */
.form-input:invalid,
.form-textarea:invalid,
.form-select:invalid,
.form-input[aria-invalid="true"],
.form-textarea[aria-invalid="true"],
.form-select[aria-invalid="true"] {
  border-color: var(--color-error, #c53030);
  box-shadow: 0 0 0 3px rgba(197, 48, 48, 0.1);
}

/* Error message styling */
.form-error {
  color: var(--color-error, #c53030);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.form-error::before {
  content: "⚠";
  font-size: 1rem;
  flex-shrink: 0;
}

/* Success state */
.form-input:valid:not(:placeholder-shown),
.form-textarea:valid:not(:placeholder-shown) {
  border-color: var(--color-success, #2f855a);
}

/* ==========================================================================
   KEYBOARD NAVIGATION ENHANCEMENTS
   ========================================================================== */

/* Roving tabindex styling */
[role="group"] [tabindex="-1"] {
  opacity: 0.7;
}

[role="group"] [tabindex="0"] {
  opacity: 1;
  position: relative;
}

/* Navigation hint for grouped elements */
[role="group"]::before {
  content: attr(aria-label) " - Use arrow keys to navigate";
  position: absolute;
  top: -2rem;
  left: 0;
  font-size: 0.75rem;
  color: var(--color-text-light);
  opacity: 0;
  transition: opacity 0.2s ease;
}

[role="group"]:focus-within::before {
  opacity: 1;
}

/* ==========================================================================
   ERROR PREVENTION & RECOVERY
   ========================================================================== */

/* Timeout warnings */
.timeout-warning {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--color-warning, #d69e2e);
  color: var(--color-text);
  padding: 1rem;
  border-radius: var(--radius-md, 0.5rem);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  max-width: 300px;
}

/* Success/confirmation messages */
.success-message {
  background: var(--color-success, #2f855a);
  color: white;
  padding: 1rem;
  border-radius: var(--radius-md, 0.5rem);
  margin: 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.success-message::before {
  content: "✓";
  font-size: 1.25rem;
  font-weight: bold;
}

/* ==========================================================================
   RESPONSIVE ACCESSIBILITY
   ========================================================================== */

/* Mobile-specific accessibility improvements */
@media (max-width: 768px) {
  /* Larger touch targets on mobile */
  button,
  a,
  input,
  textarea,
  select,
  [role="button"] {
    min-height: 48px;
    min-width: 48px;
  }
  
  /* Larger text for better readability */
  body {
    font-size: 18px;
  }
  
  /* Increased spacing for easier navigation */
  .nav-menu {
    gap: 1rem;
  }
  
  .hero-links {
    gap: 1rem;
  }
}

/* Tablet landscape orientation fixes */
@media (max-width: 1024px) and (orientation: landscape) {
  .hero {
    min-height: 100vh;
    padding-top: calc(80px + 1rem);
  }
}

/* ==========================================================================
   LANDMARK ROLES & STRUCTURE
   ========================================================================== */

/* Ensure proper landmark styling */
[role="banner"],
[role="main"],
[role="contentinfo"],
[role="navigation"],
[role="complementary"],
[role="region"] {
  position: relative;
}

/* Visual indication of landmarks in development */
[data-dev="true"] [role="banner"]::before,
[data-dev="true"] [role="main"]::before,
[data-dev="true"] [role="contentinfo"]::before,
[data-dev="true"] [role="navigation"]::before {
  content: attr(role);
  position: absolute;
  top: 0;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: bold;
  text-transform: uppercase;
  z-index: 999;
}

/* ==========================================================================
   PRINT ACCESSIBILITY
   ========================================================================== */

@media print {
  /* Ensure links are accessible in print */
  a[href^="http"]:after,
  a[href^="https"]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  
  /* Hide interactive elements that don't work in print */
  .nav-toggle,
  .theme-toggle,
  .pronunciation-audio,
  button:not(.download-button),
  .skip-links {
    display: none !important;
  }
  
  /* Ensure sufficient contrast in print */
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }
  
  /* Print focus indicators */
  :focus {
    outline: 2px solid black !important;
  }
}