/**
 * WCAG 2.1.1 Keyboard Accessibility Styles
 * PIP Talent Suite - Accessibility Layer
 *
 * Provides visible focus indicators, skip links, and keyboard navigation styles
 * Compliant with WCAG 2.1 Level AA requirements
 */

/* ==========================================================================
   1. FOCUS INDICATORS - High visibility for keyboard navigation
   ========================================================================== */

/* Universal focus outline - high contrast, visible on all backgrounds */
:focus {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
}

/* Focus-visible for modern browsers - only show on keyboard navigation */
:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(0, 95, 204, 0.25);
}

/* High contrast focus for dark backgrounds */
.dark-bg :focus-visible,
.bg-dark :focus-visible,
[data-theme="dark"] :focus-visible {
  outline-color: #00d4ff;
  box-shadow: 0 0 0 6px rgba(0, 212, 255, 0.3);
}

/* Button focus states */
button:focus-visible,
[role="button"]:focus-visible,
.btn:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(0, 95, 204, 0.25);
  transform: translateY(-1px);
  transition: transform 0.1s ease;
}

/* Link focus states */
a:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  border-radius: 2px;
  background-color: rgba(0, 95, 204, 0.1);
}

/* Form input focus states */
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[contenteditable="true"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 0;
  border-color: #005fcc;
  box-shadow: 0 0 0 4px rgba(0, 95, 204, 0.2);
}

/* Checkbox and radio focus */
input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 3px;
}

/* Custom checkbox/radio wrapper focus */
.checkbox-wrapper:focus-within,
.radio-wrapper:focus-within {
  outline: 2px solid #005fcc;
  outline-offset: 4px;
  border-radius: 4px;
}

/* ==========================================================================
   2. SKIP LINKS - Allow keyboard users to bypass repetitive content
   ========================================================================== */

.skip-links {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 8px;
  z-index: 10001;
  padding: 12px 24px;
  background: #005fcc;
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: top 0.2s ease;
}

.skip-link:focus, .skip-link:focus-visible {
  top: 8px !important;
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

.skip-link:hover {
  background: #0047a3;
}

/* ==========================================================================
   3. KEYBOARD NAVIGATION INDICATORS
   ========================================================================== */

/* Visual indicator that keyboard mode is active */
body.keyboard-nav-active *:focus {
  outline: 3px solid #005fcc !important;
  outline-offset: 2px !important;
}

/* Navigation menu keyboard states */
.nav-item:focus-visible,
.menu-item:focus-visible,
[role="menuitem"]:focus-visible {
  background-color: rgba(0, 95, 204, 0.15);
  outline: 2px solid #005fcc;
  outline-offset: -2px;
}

/* Dropdown menu keyboard navigation */
.dropdown-menu:focus-within {
  display: block;
  visibility: visible;
  opacity: 1;
}

[role="menu"]:focus-visible {
  outline: 2px solid #005fcc;
}

[role="menuitem"]:focus-visible {
  background-color: #e8f0fe;
  color: #005fcc;
}

/* Tab navigation */
[role="tab"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: -3px;
  z-index: 1;
}

[role="tabpanel"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 4px;
}

/* ==========================================================================
   4. MODAL & DIALOG ACCESSIBILITY
   ========================================================================== */

/* Modal focus trap indicator */
.modal:focus-visible,
[role="dialog"]:focus-visible {
  outline: none;
}

.modal-content:focus-visible,
[role="dialog"] > *:first-child:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 4px;
}

/* Focus trap boundaries - visual indicators in dev mode */
.focus-trap-start:focus,
.focus-trap-end:focus {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Modal close button emphasis */
.modal-close:focus-visible,
[aria-label="Close"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  background-color: rgba(0, 95, 204, 0.1);
}

/* ==========================================================================
   5. FORM ACCESSIBILITY
   ========================================================================== */

/* Required field indicators */
.form-group.required label::after,
label.required::after {
  content: " *";
  color: #dc3545;
  font-weight: bold;
}

/* Error state focus */
.is-invalid:focus-visible,
.error:focus-visible,
[aria-invalid="true"]:focus-visible {
  outline-color: #dc3545;
  border-color: #dc3545;
  box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.25);
}

/* Success state focus */
.is-valid:focus-visible,
.success:focus-visible,
[aria-invalid="false"]:focus-visible {
  outline-color: #28a745;
  border-color: #28a745;
  box-shadow: 0 0 0 4px rgba(40, 167, 69, 0.25);
}

/* Form field label association indicator */
label:focus-within {
  color: #005fcc;
}

/* Fieldset focus */
fieldset:focus-within {
  border-color: #005fcc;
  box-shadow: 0 0 0 2px rgba(0, 95, 204, 0.1);
}

/* ==========================================================================
   6. INTERACTIVE ELEMENTS
   ========================================================================== */

/* Card focus states */
.card:focus-visible,
.card-clickable:focus-visible,
[role="article"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  box-shadow: 0 4px 20px rgba(0, 95, 204, 0.2);
}

/* List item focus */
.list-item:focus-visible,
[role="listitem"]:focus-visible,
[role="option"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: -2px;
  background-color: rgba(0, 95, 204, 0.1);
}

/* Tree view focus */
[role="treeitem"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: -2px;
  background-color: rgba(0, 95, 204, 0.1);
}

/* Slider/Range focus */
input[type="range"]:focus-visible {
  outline: none;
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 4px rgba(0, 95, 204, 0.4);
}

/* Toggle/Switch focus */
.toggle:focus-visible,
.switch:focus-visible,
[role="switch"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 3px;
}

/* ==========================================================================
   7. DATA TABLE ACCESSIBILITY
   ========================================================================== */

/* Table cell focus */
td:focus-visible,
th:focus-visible,
[role="cell"]:focus-visible,
[role="columnheader"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: -2px;
  background-color: rgba(0, 95, 204, 0.1);
}

/* Sortable column header focus */
th[aria-sort]:focus-visible,
[role="columnheader"][aria-sort]:focus-visible {
  background-color: rgba(0, 95, 204, 0.15);
}

/* Table row focus for row-level interaction */
tr:focus-visible,
[role="row"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: -2px;
}

/* Grid cell focus */
[role="gridcell"]:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: -2px;
  background-color: #e8f0fe;
}

/* ==========================================================================
   8. DRAG AND DROP ACCESSIBILITY
   ========================================================================== */

/* Draggable item focus */
[draggable="true"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
  cursor: grab;
}

/* Drag in progress */
[aria-grabbed="true"] {
  opacity: 0.8;
  outline: 3px dashed #005fcc;
  cursor: grabbing;
}

/* Drop target focus */
[aria-dropeffect]:focus-visible {
  outline: 3px dashed #28a745;
  outline-offset: 4px;
  background-color: rgba(40, 167, 69, 0.1);
}

/* ==========================================================================
   9. TOOLTIP & POPOVER ACCESSIBILITY
   ========================================================================== */

/* Tooltip trigger focus */
[aria-describedby]:focus-visible,
[data-tooltip]:focus-visible {
  position: relative;
}

/* Ensure tooltips are visible on focus */
[aria-describedby]:focus-visible + [role="tooltip"],
[data-tooltip]:focus-visible::after {
  visibility: visible;
  opacity: 1;
}

/* ==========================================================================
   10. 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;
  }

  .skip-link:focus, .skip-link:focus-visible {
    transition: none;
  }
}

/* ==========================================================================
   11. HIGH CONTRAST MODE SUPPORT
   ========================================================================== */

@media (prefers-contrast: high) {
  :focus-visible {
    outline: 4px solid currentColor;
    outline-offset: 2px;
    box-shadow: none;
  }

  .skip-link:focus, .skip-link:focus-visible {
    outline: 4px solid #ffffff;
    background: #000000;
    color: #ffffff;
  }

  button:focus-visible,
  a:focus-visible,
  input:focus-visible {
    outline: 4px solid currentColor;
  }
}

/* ==========================================================================
   12. SCREEN READER UTILITIES
   ========================================================================== */

/* 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: 0;
}

/* Show on focus (for skip links etc.) */
.sr-only-focusable:focus,
.visually-hidden-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Live region styling */
[aria-live] {
  position: relative;
}

[aria-live="polite"]::before {
  content: "";
}

[aria-live="assertive"] {
  font-weight: bold;
}

/* ==========================================================================
   13. FOCUS ORDER HELPERS
   ========================================================================== */

/* Ensure proper focus order with tabindex */
[tabindex="-1"]:focus {
  outline: none;
}

[tabindex="0"]:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 2px;
}

/* Focus indicator for programmatically focused elements */
.focus-programmatic {
  animation: focusPulse 0.3s ease-out;
}

@keyframes focusPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 95, 204, 0.7);
  }
  100% {
    box-shadow: 0 0 0 8px rgba(0, 95, 204, 0);
  }
}

/* ==========================================================================
   14. LOADING & BUSY STATES
   ========================================================================== */

[aria-busy="true"] {
  cursor: wait;
  opacity: 0.7;
}

[aria-busy="true"]:focus-visible {
  outline-style: dashed;
}

/* ==========================================================================
   15. DISABLED STATES
   ========================================================================== */

[aria-disabled="true"],
[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

[aria-disabled="true"]:focus,
[disabled]:focus {
  outline: 2px dashed #6c757d;
  outline-offset: 2px;
}