/* ==========================================================================
   AdminLTE Accessibility Styles - WCAG 2.1 AA Compliance
   ========================================================================== */

/* Skip Links - WCAG 2.4.1: Bypass Blocks */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  z-index: 999999;
  padding: 8px 16px;
  font-weight: 600;
  color: var(--bs-white);
  text-decoration: none;
  background: var(--bs-primary);

  &:focus {
    top: 0;
    outline: 3px solid var(--bs-warning);
    outline-offset: 2px;
  }

  &:hover {
    color: var(--bs-white);
    text-decoration: none;
    background: var(--bs-primary-emphasis);
  }
}

/* Enhanced Focus Indicators - WCAG 2.4.7: Focus Visible */
.focus-enhanced {
  &:focus {
    outline: 3px solid var(--bs-focus-ring-color, #0d6efd);
    outline-offset: 2px;
    box-shadow: 0 0 0 .25rem rgba(13, 110, 253, .25);
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .card {
    border: 2px solid;
  }

  .btn {
    border-width: 2px;
  }

  .nav-link {
    border: 1px solid transparent;

    &:hover,
    &:focus {
      border-color: currentcolor;
    }
  }
}

/* Reduced Motion Support - WCAG 2.3.3: Animation from Interactions */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  .fade {
    opacity: 1 !important;
    /* stylelint-disable-next-line property-disallowed-list */
    transition: none !important;
  }

  .collapse {
    /* stylelint-disable-next-line property-disallowed-list */
    transition: none !important;
  }

  .modal.fade .modal-dialog {
    transform: none !important;
  }
}

/* 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;
}

.sr-only-focusable:focus {
  position: static !important;
  width: auto !important;
  height: auto !important;
  padding: inherit !important;
  margin: inherit !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Focus Trap Utilities */
.focus-trap {
  &:focus {
    box-shadow: 0 0 0 .25rem rgba(13, 110, 253, .25);
  }
}

/* Accessible Color Combinations - WCAG 1.4.3: Contrast (Minimum) */
.text-accessible-primary {
  color: #003d82; /* 4.5:1 contrast on white */
}

.text-accessible-success {
  color: #0f5132; /* 4.5:1 contrast on white */
}

.text-accessible-danger {
  color: #842029; /* 4.5:1 contrast on white */
}

.text-accessible-warning {
  color: #664d03; /* 4.5:1 contrast on white */
}

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

  &.live-region-visible {
    position: static;
    left: auto;
    width: auto;
    height: auto;
    overflow: visible;
  }
}

/* Enhanced Error States - WCAG 3.3.1: Error Identification */
.form-control.is-invalid {
  border-color: var(--bs-danger);

  &:focus {
    border-color: var(--bs-danger);
    box-shadow: 0 0 0 .25rem rgba(220, 53, 69, .25);
  }
}

.invalid-feedback {
  display: block;
  width: 100%;
  margin-top: .25rem;
  font-size: .875em;
  color: var(--bs-danger);

  &[role="alert"] {
    font-weight: 600;
  }
}

/* Target Size - WCAG 2.5.8: Target Size (Minimum) */
.touch-target {
  min-width: 44px;
  min-height: 44px;

  &.touch-target-small {
    min-width: 24px;
    min-height: 24px;
  }
}

/* Table Accessibility */
.table-accessible {
  th {
    font-weight: 600;
    background-color: var(--bs-secondary-bg);

    &[scope="col"] {
      border-bottom: 2px solid var(--bs-border-color);
    }

    &[scope="row"] {
      border-right: 2px solid var(--bs-border-color);
    }
  }

  caption {
    padding: .75rem;
    font-weight: 600;
    color: var(--bs-secondary);
    text-align: left;
    caption-side: top;
  }
}

/* Navigation Landmarks */
nav[role="navigation"] {
  &:not([aria-label]):not([aria-labelledby]) {
    &::before {
      position: absolute;
      left: -10000px;
      content: "Navigation";
    }
  }
}

/* Form Fieldset Styling */
fieldset {
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--bs-border-color);

  legend {
    padding: 0 .5rem;
    margin-bottom: .5rem;
    font-size: 1.1em;
    font-weight: 600;
  }
}

/* Loading States */
.loading[aria-busy="true"] {
  position: relative;
  pointer-events: none;

  &::after {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin-top: -10px;
    margin-left: -10px;
    content: "";
    border: 2px solid var(--bs-primary);
    border-top-color: transparent;
    animation: spin 1s linear infinite;
  }

  @media (prefers-reduced-motion: reduce) {
    &::after {
      border-top-color: var(--bs-primary);
      animation: none;
    }
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Dark Mode Accessibility */
[data-bs-theme="dark"] {
  .text-accessible-primary {
    color: #6ea8fe;
  }

  .text-accessible-success {
    color: #75b798;
  }

  .text-accessible-danger {
    color: #f1aeb5;
  }

  .text-accessible-warning {
    color: #ffda6a;
  }
}

/* Print Accessibility */
@media print {
  .skip-link,
  .btn,
  .nav-link {
    color: #000 !important;
    background: transparent !important;
    border: 1px solid #000 !important;
  }

  a[href^="http"]::after {
    font-size: .8em;
    content: " (" attr(href) ")";
  }
}
