/* ============================================================
   nreg-a11y.css  —  Accessibility Enhancements
   WCAG 2.1 AA compliance styles
   ============================================================ */

/* ── Skip Navigation ─────────────────────────────────────── */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 10000;
  padding: 12px 24px;
  background: #2c3e50;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 8px 0;
  transition: top 0.2s ease;
}

.skip-nav:focus {
  top: 0;
  color: #fff;
  outline: 3px solid #ffc107;
  outline-offset: 2px;
}

/* ── Focus Styles (visible outlines for keyboard users) ──── */
*:focus-visible {
  outline: 3px solid #0d6efd !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.25) !important;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #0d6efd !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.25) !important;
}

/* Focus style for sidebar links */
.sidebar-menu a:focus-visible {
  outline: 3px solid #ffc107 !important;
  outline-offset: -2px !important;
  box-shadow: none !important;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

/* Focus style for nav items */
.main-header a:focus-visible,
.main-header button:focus-visible {
  outline: 3px solid #ffc107 !important;
  outline-offset: 2px !important;
}

/* ── Screen Reader Only (visually hidden but accessible) ─── */
.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,
.sr-only-focusable:active {
  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;
}

/* ── Reduced Motion (respect user 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;
  }
}

/* ── High Contrast Mode Support ──────────────────────────── */
@media (prefers-contrast: high) {
  .main-sidebar {
    border-right: 2px solid #fff;
  }

  .sidebar-menu a {
    border: 1px solid transparent;
  }

  .sidebar-menu li.active > a {
    border: 1px solid #fff;
  }

  .btn {
    border: 2px solid currentColor !important;
  }

  .card {
    border: 2px solid #333 !important;
  }

  .table th,
  .table td {
    border-color: #333 !important;
  }
}

/* ── Forced Colors Mode (Windows High Contrast) ──────────── */
@media (forced-colors: active) {
  .skip-nav:focus {
    outline: 3px solid Highlight;
    background: Canvas;
    color: CanvasText;
  }

  .sidebar-menu li.active > a {
    border: 2px solid Highlight;
  }

  .btn {
    border: 1px solid ButtonText;
  }
}

/* ── Improved Link Visibility ────────────────────────────── */
.content-wrapper a:not(.btn):not(.nav-link):not(.page-link) {
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.content-wrapper a:not(.btn):not(.nav-link):not(.page-link):hover {
  text-decoration-thickness: 2px;
}

/* ── Table Accessibility ─────────────────────────────────── */
.table th {
  font-weight: 700;
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
  --bs-table-bg-type: rgba(0, 0, 0, 0.03);
}

/* ── Form Accessibility ──────────────────────────────────── */
.form-control:focus,
.form-select:focus {
  border-color: #0d6efd;
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
  border-color: #dc3545;
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25);
}

/* Error messages must be visible */
.invalid-feedback {
  font-weight: 500;
}

/* ── ARIA Current Page Indicator ─────────────────────────── */
.sidebar-menu a[aria-current="page"] {
  font-weight: 700;
  position: relative;
}

.sidebar-menu a[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: #28a745;
  border-radius: 0 3px 3px 0;
}

/* ── Treeview Expand/Collapse Indicator ──────────────────── */
.sidebar-menu .treeview > a[aria-expanded="true"] > .fa-angle-right,
.sidebar-menu .treeview > a[aria-expanded="true"] > .treeview-indicator {
  transform: rotate(90deg);
}

/* ── Touch Target Size (minimum 44×44px per WCAG 2.5.5) ─── */
.sidebar-menu a {
  min-height: 44px;
  display: flex;
  align-items: center;
}

.main-header .btn,
.main-header .nav-link {
  min-height: 44px;
  min-width: 44px;
}

/* ── Selection highlight for better readability ──────────── */
::selection {
  background: #0d6efd;
  color: #fff;
}

/* ── Tooltip / Title attribute enhancement ───────────────── */
[title] {
  cursor: help;
}

a[title],
button[title] {
  cursor: pointer;
}