/*
 * Accessibility (a11y) styles — WCAG 2.1 Level A/AA.
 * Skip link, focus visibility, reduced motion, visually-hidden utility.
 */

/* Skip link: visually hidden until focused (first focusable element) */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 10000;
  padding: 0.75rem 1rem;
  background: var(--color-blue-600, #2563eb);
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 0.25rem 0;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid white;
  outline-offset: 2px;
}

/* Visible focus for keyboard; no outline for mouse-only focus when browser supports :focus-visible */
:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-blue-600, #2563eb);
  outline-offset: 2px;
}

/* 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;
  }
}

/* Visually hidden: for screen-reader-only text (e.g. section headings) */
.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;
}