/* ==========================================================================
   Accessibility Styles
   WCAG 2.1 AA Compliant Focus States, Skip Links, and Utilities
   ========================================================================== */

/* ==========================================================================
   Skip to Content Link
   Allows keyboard users to bypass navigation and skip directly to main content
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-navy-blue, #1A237E);
  color: var(--color-white, #FFFFFF);
  padding: 12px 24px;
  text-decoration: none;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-weight: 600;
  font-size: 1rem;
  border-radius: 0 0 8px 8px;
  z-index: 10000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-primary-red, #D93025);
  outline-offset: 2px;
}

/* ==========================================================================
   Focus Styles (WCAG 2.1 AA Compliant)
   Minimum 3:1 contrast ratio for focus indicators
   ========================================================================== */

/* High-contrast focus ring for all interactive elements */
:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
}

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

/* Enhanced focus for links */
a:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Enhanced focus for buttons */
button:focus-visible,
.btn:focus-visible,
[role="button"]:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
}

/* Focus styles for navigation links */
.nav__link:focus-visible,
.nav__dropdown-link:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
  background-color: var(--color-light-gray, #F5F5F5);
}

/* Focus styles for form inputs */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 0;
  border-color: var(--color-navy-blue, #1A237E);
}

/* High contrast focus for elements on dark backgrounds */
.hero a:focus-visible,
.hero button:focus-visible,
.hero .btn:focus-visible,
.cta-banner a:focus-visible,
.cta-banner button:focus-visible,
.cta-banner .btn:focus-visible,
[data-theme="dark"] a:focus-visible,
[data-theme="dark"] button:focus-visible {
  outline-color: var(--color-white, #FFFFFF);
}

/* Focus indicator for mobile menu toggle */
.nav__toggle:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Focus styles for accordion buttons */
.accordion__button:focus-visible,
[aria-expanded]:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: 2px;
}

/* Focus styles for tab navigation */
[role="tab"]:focus-visible {
  outline: 3px solid var(--color-navy-blue, #1A237E);
  outline-offset: -2px;
}

/* ==========================================================================
   Screen Reader Only Content
   Visually hidden but accessible to assistive technologies
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Make sr-only focusable elements visible when focused */
.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ==========================================================================
   Reduced Motion Preference
   Respects user's system preference for reduced motion
   ========================================================================== */

@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;
  }

  /* Ensure skip link still transitions */
  .skip-link {
    transition: none;
  }
}

/* ==========================================================================
   High Contrast Mode Support
   Enhanced styles for users who prefer high contrast
   ========================================================================== */

@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
  }

  .btn {
    border: 3px solid currentColor;
  }

  a {
    text-decoration: underline;
  }

  .nav__link,
  .nav__dropdown-link {
    text-decoration: underline;
  }

  /* Ensure focus indicators are extra visible */
  :focus-visible {
    outline-width: 4px;
  }
}

/* ==========================================================================
   ARIA Live Region Styles
   Visual indicators for dynamic content updates
   ========================================================================== */

/* Status messages - visually hidden but announced */
[role="status"],
[role="alert"] {
  /* Ensure these are in the accessibility tree */
}

/* Loading states */
[aria-busy="true"] {
  cursor: wait;
}

/* Disabled states */
[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   Touch Target Sizes (WCAG 2.1 Level AAA)
   Minimum 44x44 pixels for touch targets
   ========================================================================== */

/* Ensure buttons meet minimum touch target size */
button,
.btn,
[role="button"],
input[type="submit"],
input[type="button"],
input[type="reset"] {
  min-height: 44px;
  min-width: 44px;
}

/* Ensure links have adequate touch targets on mobile */
@media (max-width: 767px) {
  .nav__link,
  .nav__dropdown-link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}

/* ==========================================================================
   Form Accessibility Enhancements
   ========================================================================== */

/* Error state for form fields */
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-primary-red, #D93025);
  border-width: 2px;
}

/* Required field indicator */
.form-label[data-required]::after,
label[data-required]::after {
  content: " *";
  color: var(--color-primary-red, #D93025);
}

/* Error message styling */
.form-error,
[role="alert"] {
  color: var(--color-primary-red, #D93025);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Success message styling */
.form-success {
  color: #2E7D32;
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* ==========================================================================
   Image Accessibility
   Placeholder styles for images that need alt text
   ========================================================================== */

/* Placeholder for images without proper alt text (development helper) */
img:not([alt]),
img[alt=""] {
  outline: 3px dashed var(--color-primary-red, #D93025);
}

/* Hide decorative images from assistive technology */
img[alt=""],
img[role="presentation"] {
  /* These should be ignored by screen readers */
}

/* ==========================================================================
   Keyboard Navigation Indicators
   ========================================================================== */

/* Indicate current item in navigation */
.nav__link[aria-current="page"] {
  color: var(--color-primary-red, #D93025);
  font-weight: 600;
}

/* Indicate expanded state for dropdowns */
.nav__link[aria-expanded="true"] .nav__link-arrow {
  transform: rotate(180deg);
}

/* ==========================================================================
   Print Styles for Accessibility
   ========================================================================== */

@media print {
  /* Show URLs for links when printing */
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  /* Don't show URLs for internal links or javascript links */
  a[href^="#"]::after,
  a[href^="javascript:"]::after {
    content: "";
  }

  /* Ensure adequate contrast for printing */
  * {
    color: #000 !important;
    background: #fff !important;
  }
}