/* ============================================================
   Accessibility layer — WCAG-oriented utilities & modes
   ============================================================ */

/* Screen-reader only (visually hidden, available to AT) */
.sr-only,
.visually-hidden {
  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;
  margin: 0 !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Skip links */
.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -3.5rem;
  z-index: 10000;
  padding: .55rem 1.1rem;
  background: var(--accent, #e3b341);
  color: #14110a;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 650;
  font-size: .9rem;
  transition: top .15s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,.25);
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--text, #fff);
  outline-offset: 3px;
}
.skip-links {
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  z-index: 10000;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: 0;
  margin: 0;
  list-style: none;
}
.skip-links .skip-link { position: relative; top: -3.5rem; inset-inline-start: auto; }
.skip-links .skip-link:focus { top: 1rem; }

/* Focus visible — keyboard users only */
:focus { outline: none; }
:focus-visible {
  outline: 3px solid var(--accent, #e3b341);
  outline-offset: 3px;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--accent, #e3b341);
  outline-offset: 2px;
}

/* Prefer reduced motion (system + 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;
  }
}
html[data-a11y-motion="reduce"] *,
html[data-a11y-motion="reduce"] *::before,
html[data-a11y-motion="reduce"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}
html[data-a11y-motion="reduce"] .reading-progress {
  transition: none !important;
}

/* Underline links for low vision */
html[data-a11y-underline="on"] a:not(.btn):not(.nav-link):not(.navbar-brand):not(.tag-pill):not(.skip-link) {
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1.5px;
}

/* Larger base text scale (on top of reader font scale) */
html[data-a11y-text="large"] {
  font-size: 112.5%;
}
html[data-a11y-text="xlarge"] {
  font-size: 125%;
}

/* ============================================================
   High contrast mode
   ============================================================ */
html[data-a11y-contrast="high"] {
  --bg: #000;
  --surface: #0a0a0a;
  --surface-2: #121212;
  --surface-3: #1a1a1a;
  --border: #fff;
  --border-soft: #ccc;
  --text: #fff;
  --text-muted: #eee;
  --text-faint: #ddd;
  --accent: #ffff00;
  --accent-dim: #ff0;
  --accent-soft: rgba(255, 255, 0, 0.2);
  --danger: #ff6b6b;
  --success: #7dff7d;
  color-scheme: dark;
}
html[data-a11y-contrast="high"] body {
  background: #000 !important;
  color: #fff !important;
}
html[data-a11y-contrast="high"] .site-header,
html[data-a11y-contrast="high"] .site-footer,
html[data-a11y-contrast="high"] .card-surface,
html[data-a11y-contrast="high"] .post-card,
html[data-a11y-contrast="high"] .search-panel,
html[data-a11y-contrast="high"] .admin-sidebar,
html[data-a11y-contrast="high"] .admin-topbar {
  background: #0a0a0a !important;
  border-color: #fff !important;
  color: #fff !important;
}
html[data-a11y-contrast="high"] a {
  color: #ffff00 !important;
}
html[data-a11y-contrast="high"] a:hover,
html[data-a11y-contrast="high"] a:focus-visible {
  color: #fff !important;
  background: #333 !important;
}
html[data-a11y-contrast="high"] .btn,
html[data-a11y-contrast="high"] button {
  border: 2px solid #fff !important;
}
html[data-a11y-contrast="high"] .btn-accent {
  background: #ffff00 !important;
  color: #000 !important;
  border-color: #ffff00 !important;
}
html[data-a11y-contrast="high"] .form-control,
html[data-a11y-contrast="high"] .form-select,
html[data-a11y-contrast="high"] input,
html[data-a11y-contrast="high"] textarea,
html[data-a11y-contrast="high"] select {
  background: #000 !important;
  color: #fff !important;
  border: 2px solid #fff !important;
}
html[data-a11y-contrast="high"] img {
  outline: 1px solid #fff;
}
html[data-a11y-contrast="high"] :focus-visible {
  outline: 3px solid #ffff00 !important;
  outline-offset: 3px !important;
}

/* ============================================================
   A11y preferences panel
   ============================================================ */
.a11y-fab {
  position: fixed;
  inset-inline-end: 1rem;
  bottom: 4.5rem;
  z-index: 9500;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--border-soft);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(0,0,0,.28);
  font-size: 1.15rem;
  font-weight: 700;
}
.a11y-fab:hover { border-color: var(--accent); color: var(--accent); }
.a11y-fab[aria-expanded="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
}

.a11y-panel {
  position: fixed;
  inset-inline-end: 1rem;
  bottom: 8rem;
  z-index: 9600;
  width: min(320px, calc(100vw - 2rem));
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  box-shadow: 0 16px 48px rgba(0,0,0,.35);
  padding: 1rem 1.1rem;
  display: none;
}
.a11y-panel.is-open { display: block; }
.a11y-panel h2 {
  font-size: .95rem;
  font-weight: 700;
  margin: 0 0 .75rem;
}
.a11y-panel .a11y-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .45rem 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: .85rem;
}
.a11y-panel .a11y-row:last-of-type { border-bottom: none; }
.a11y-panel label { margin: 0; cursor: pointer; flex: 1; }
.a11y-panel select {
  max-width: 7.5rem;
  font-size: .8rem;
  padding: .25rem .4rem;
  border-radius: 6px;
  border: 1px solid var(--border-soft);
  background: var(--bg, var(--surface-2));
  color: inherit;
}
.a11y-panel .a11y-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: .75rem;
}
.a11y-panel .a11y-hint {
  font-size: .75rem;
  color: var(--text-muted);
  margin: .5rem 0 0;
  line-height: 1.45;
}

/* Toggle switch */
.a11y-switch {
  position: relative;
  width: 2.4rem;
  height: 1.3rem;
  flex-shrink: 0;
}
.a11y-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}
.a11y-switch .track {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--text-muted) 30%, transparent);
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s;
}
.a11y-switch .track::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: #fff;
  top: .15rem;
  inset-inline-start: .15rem;
  transition: transform .15s;
  box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
.a11y-switch input:checked + .track {
  background: var(--accent);
}
.a11y-switch input:checked + .track::after {
  transform: translateX(1.1rem);
}
html[dir="rtl"] .a11y-switch input:checked + .track::after {
  transform: translateX(-1.1rem);
}
.a11y-switch input:focus-visible + .track {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Admin checker report cards */
.a11y-check-grid {
  display: grid;
  gap: .65rem;
}
.a11y-check-item {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: .85rem 1rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: .75rem;
  align-items: start;
}
.a11y-check-item .status {
  font-size: .7rem;
  font-weight: 700;
  padding: .2rem .5rem;
  border-radius: 999px;
}
.a11y-check-item .status.pass {
  background: color-mix(in srgb, #9ecb8c 22%, transparent);
  color: #3d6b3a;
}
.a11y-check-item .status.fail {
  background: color-mix(in srgb, #e5637a 22%, transparent);
  color: #a33;
}
.a11y-check-item .status.warn {
  background: color-mix(in srgb, #e3b341 22%, transparent);
  color: #b8860b;
}
[data-theme="dark"] .a11y-check-item .status.pass,
html.dark .a11y-check-item .status.pass { color: #b6e0a8; }
[data-theme="dark"] .a11y-check-item .status.fail,
html.dark .a11y-check-item .status.fail { color: #f5a3b0; }
[data-theme="dark"] .a11y-check-item .status.warn,
html.dark .a11y-check-item .status.warn { color: #e3b341; }
.a11y-check-item h3 {
  font-size: .88rem;
  font-weight: 650;
  margin: 0 0 .25rem;
}
.a11y-check-item p {
  font-size: .8rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}
.a11y-check-item code {
  font-size: .75rem;
  direction: ltr;
}

/* Landmark highlight during checker (optional) */
html[data-a11y-debug="on"] [role="main"],
html[data-a11y-debug="on"] main,
html[data-a11y-debug="on"] [role="navigation"],
html[data-a11y-debug="on"] [role="banner"],
html[data-a11y-debug="on"] [role="contentinfo"],
html[data-a11y-debug="on"] [role="search"] {
  outline: 2px dashed color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
}