/* ============================================
   Accessibility-Specific Styles
   Electric Products Landing Page
   WCAG 2.1 Level AA Compliance
   ============================================ */

/* ==========================================
   Focus Indicators
   ========================================== */

/* Enhanced focus visible for keyboard navigation */
:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
  transition: outline-offset var(--duration-fast) var(--ease-out);
}

/* Focus within for container elements */
:focus-within {
  outline: 2px solid var(--color-primary-300);
  outline-offset: 2px;
}

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

/* High contrast focus indicators */
@media (prefers-contrast: high) {
  :focus-visible {
    outline-width: 4px;
    outline-color: currentColor;
    outline-offset: 4px;
  }
}

/* Interactive element focus states */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.1);
}

/* Navigation link focus */
.nav-link:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 4px;
  background-color: var(--color-primary-50);
  border-radius: var(--radius-base);
}

/* Button focus states */
.btn:focus-visible {
  outline: 3px solid var(--color-primary-700);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(33, 150, 243, 0.15);
  transform: scale(1.02);
}

.btn-primary:focus-visible {
  outline-color: var(--color-primary-900);
  box-shadow: 0 0 0 6px rgba(33, 150, 243, 0.2);
}

.btn-secondary:focus-visible {
  outline-color: var(--color-secondary-700);
  box-shadow: 0 0 0 6px rgba(0, 0, 0, 0.1);
}

/* Form element focus */
input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
input[type="tel"]:focus-visible,
input[type="url"]:focus-visible,
input[type="search"]:focus-visible,
input[type="number"]:focus-visible,
input[type="password"]:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 0;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.1);
}

/* Checkbox and radio focus */
input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.15);
}

/* Card and interactive container focus */
.product-card:focus-visible,
.stat:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 4px;
  box-shadow: var(--shadow-lg), 0 0 0 6px rgba(33, 150, 243, 0.1);
}

/* ==========================================
   Screen Reader Only Content
   ========================================== */

/* Visually hidden but accessible to screen readers */
.sr-only,
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focusable screen reader only content */
.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Skip navigation link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-index-tooltip);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-primary-600);
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 3px solid var(--color-primary-900);
  outline-offset: 3px;
}

/* Screen reader announcements */
.sr-announcement {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ==========================================
   High Contrast Mode Support
   ========================================== */

@media (prefers-contrast: high) {
  /* Increase border visibility */
  *,
  *::before,
  *::after {
    border-color: currentColor !important;
  }

  /* Enhance button contrast */
  .btn {
    border: 2px solid currentColor;
    font-weight: var(--font-weight-bold);
  }

  /* Enhance link visibility */
  a {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
  }

  /* Enhance form element borders */
  input,
  textarea,
  select {
    border: 2px solid currentColor;
  }

  /* Remove background images that may reduce contrast */
  .hero,
  .products-section,
  .company-section {
    background-image: none !important;
  }

  /* Ensure sufficient contrast for shadows */
  .product-card,
  .stat,
  .btn {
    box-shadow: 0 0 0 2px currentColor;
  }

  /* Enhance focus indicators */
  :focus-visible {
    outline-width: 4px;
    outline-style: solid;
    outline-color: currentColor;
  }
}

/* ==========================================
   Reduced Motion Support
   ========================================== */

@media (prefers-reduced-motion: reduce) {
  /* Disable all animations and transitions */
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  /* Remove parallax effects */
  .hero,
  .parallax {
    background-attachment: scroll !important;
    transform: none !important;
  }

  /* Disable hover transforms */
  .product-card:hover,
  .btn:hover,
  .stat:hover {
    transform: none !important;
  }

  /* Keep essential focus transitions */
  :focus-visible {
    transition: outline-offset 0.01ms !important;
  }
}

/* ==========================================
   Color Contrast Enhancements
   ========================================== */

/* Ensure minimum 4.5:1 contrast ratio for normal text */
.text-low-contrast {
  color: var(--color-text-primary);
  background-color: var(--color-background-primary);
}

/* Ensure minimum 3:1 contrast ratio for large text */
.text-large-low-contrast {
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

/* Error message contrast */
.error-message {
  color: var(--color-error-dark);
  background-color: var(--color-error-light);
  border: 2px solid var(--color-error);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-medium);
}

/* Success message contrast */
.success-message {
  color: var(--color-success-dark);
  background-color: var(--color-success-light);
  border: 2px solid var(--color-success);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-medium);
}

/* Warning message contrast */
.warning-message {
  color: var(--color-warning-dark);
  background-color: var(--color-warning-light);
  border: 2px solid var(--color-warning);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-medium);
}

/* Info message contrast */
.info-message {
  color: var(--color-info-dark);
  background-color: var(--color-info-light);
  border: 2px solid var(--color-info);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-medium);
}

/* ==========================================
   Keyboard Navigation Enhancements
   ========================================== */

/* Visible focus for all interactive elements */
[tabindex]:focus-visible,
[role="button"]:focus-visible,
[role="link"]:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(33, 150, 243, 0.15);
}

/* Navigation menu keyboard support */
.nav-menu [role="menuitem"]:focus-visible {
  background-color: var(--color-primary-50);
  outline: 3px solid var(--color-primary-500);
  outline-offset: -3px;
}

/* Modal keyboard trap indicator */
.modal:focus-within {
  outline: 4px solid var(--color-primary-500);
  outline-offset: -4px;
}

/* Dropdown keyboard navigation */
[role="listbox"] [role="option"]:focus,
[role="menu"] [role="menuitem"]:focus {
  background-color: var(--color-primary-100);
  outline: 2px solid var(--color-primary-500);
  outline-offset: -2px;
}

/* ==========================================
   Touch Target Size
   ========================================== */

/* Ensure minimum 44x44px touch targets */
.btn,
.nav-link,
a,
button,
input[type="submit"],
input[type="button"],
input[type="checkbox"],
input[type="radio"] {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Checkbox and radio larger touch targets */
input[type="checkbox"],
input[type="radio"] {
  width: 24px;
  height: 24px;
  margin: 10px;
}

/* Mobile touch target enhancement */
@media (max-width: 768px) {
  .btn,
  .nav-link,
  a,
  button {
    min-height: 48px;
    padding: var(--space-3) var(--space-4);
  }
}

/* ==========================================
   ARIA Live Regions
   ========================================== */

/* Status messages */
[role="status"],
[aria-live="polite"] {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background-color: var(--color-background-secondary);
  border-left: 4px solid var(--color-primary-500);
}

/* Alert messages */
[role="alert"],
[aria-live="assertive"] {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background-color: var(--color-error-light);
  border-left: 4px solid var(--color-error);
  font-weight: var(--font-weight-semibold);
}

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

/* Required field indicator */
[required]::after,
[aria-required="true"]::after {
  content: " *";
  color: var(--color-error);
  font-weight: var(--font-weight-bold);
}

/* Invalid field styling */
input:invalid:not(:focus),
textarea:invalid:not(:focus),
select:invalid:not(:focus) {
  border-color: var(--color-error);
  background-color: var(--color-error-light);
}

/* Valid field styling */
input:valid:not(:placeholder-shown),
textarea:valid:not(:placeholder-shown),
select:valid {
  border-color: var(--color-success);
}

/* Disabled field styling */
input:disabled,
textarea:disabled,
select:disabled,
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--color-gray-100);
  color: var(--color-text-disabled);
}

/* Form error message */
.form-group .error-message {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Dark Mode Accessibility
   ========================================== */

@media (prefers-color-scheme: dark) {
  /* Enhanced focus for dark mode */
  :focus-visible {
    outline-color: var(--color-primary-400);
    box-shadow: 0 0 0 4px rgba(100, 181, 246, 0.2);
  }

  /* Skip link dark mode */
  .skip-link {
    background-color: var(--color-primary-400);
    color: var(--color-gray-900);
  }

  /* Error messages dark mode */
  .error-message {
    color: var(--color-error-light);
    background-color: rgba(244, 67, 54, 0.15);
    border-color: var(--color-error-light);
  }

  /* Success messages dark mode */
  .success-message {
    color: var(--color-success-light);
    background-color: rgba(76, 175, 80, 0.15);
    border-color: var(--color-success-light);
  }

  /* High contrast text */
  .text-low-contrast {
    color: var(--color-text-primary);
  }
}

/* ==========================================
   Print Accessibility
   ========================================== */

@media print {
  /* Ensure focus indicators are visible in print */
  :focus-visible {
    outline: 2px solid black;
  }

  /* Show skip links in print */
  .skip-link {
    position: static;
    display: block;
  }

  /* Ensure sufficient contrast in print */
  * {
    color: black !important;
    background: white !important;
  }

  /* Show link URLs */
  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: var(--font-size-sm);
  }
}

/* ==========================================
   Responsive Accessibility
   ========================================== */

/* Mobile accessibility enhancements */
@media (max-width: 768px) {
  /* Larger touch targets */
  .btn,
  .nav-link {
    min-height: 48px;
    font-size: var(--font-size-md);
  }

  /* Increased spacing for readability */
  .form-group {
    margin-bottom: var(--space-6);
  }

  /* Enhanced focus indicators */
  :focus-visible {
    outline-width: 4px;
    outline-offset: 4px;
  }
}

/* Tablet accessibility */
@media (min-width: 769px) and (max-width: 1024px) {
  /* Optimized touch targets */
  .btn,
  .nav-link {
    min-height: 46px;
  }
}