/*
 * accessibility.css
 *
 * WCAG 2.0 accessibility enhancements for the Compliance Trestle documentation site.
 *
 * Covers:
 *   - Skip-navigation link (WCAG 2.4.1 — Bypass Blocks)
 *   - Visible focus indicators (WCAG 2.4.7 — Focus Visible)
 *   - Reduced-motion support (WCAG 2.3.3 / prefers-reduced-motion)
 *   - Sufficient colour contrast on inline code in both light and dark modes
 *     (WCAG 1.4.3 — Contrast Minimum, 4.5:1)
 */

/* -----------------------------------------------------------------------
 * 1. Skip-navigation link (injected by skip-nav.js, hidden until focused)
 * --------------------------------------------------------------------- */
.skip-nav {
  position: absolute;
  top: -9999px;
  left: -9999px;
  z-index: 10000;
  padding: 0.75em 1.25em;
  background: #005eb8;   /* high-contrast blue, >4.5:1 against white text */
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  white-space: nowrap;
}

.skip-nav:focus {
  top: 0;
  left: 0;
  outline: 3px solid #ffdd00;   /* WCAG AA-compliant yellow focus ring */
  outline-offset: 2px;
}

/* -----------------------------------------------------------------------
 * 2. Visible keyboard-focus ring (WCAG 2.4.7)
 *    Material for MkDocs resets outline; restore it for all interactive
 *    elements so keyboard-only users and screen-reader users can track
 *    their position.
 * --------------------------------------------------------------------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #005eb8;
  outline-offset: 2px;
}

/* -----------------------------------------------------------------------
 * 3. Reduced-motion (WCAG 2.3.3 / "prefers-reduced-motion")
 *    Disable decorative animations for users who have requested it via OS.
 * --------------------------------------------------------------------- */
@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;
  }
}

/* -----------------------------------------------------------------------
 * 4. Inline code contrast
 *    The default Material theme slate palette can render inline <code>
 *    with insufficient contrast.  Explicitly set colours that meet 4.5:1.
 * --------------------------------------------------------------------- */
[data-md-color-scheme="slate"] code:not([class]) {
  color: #f8f8f2;        /* ~8:1 against the slate background */
  background-color: rgba(255, 255, 255, 0.08);
}

[data-md-color-scheme="default"] code:not([class]) {
  color: #24292e;        /* ~16:1 against white */
  background-color: rgba(27, 31, 35, 0.07);
}