/* ==========================================================================
   a11y.css
   Focused accessibility stylesheet: skip-links + visible focus states.
   Loaded after the main site stylesheet on every public page.
   Intentionally small and additive — does not modify assets/css/site.css.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Skip-to-content link
   Visually hidden off-screen until it receives keyboard focus, at which
   point it becomes a clearly visible, high-contrast link pinned to the
   top-left of the viewport.
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10000;
  transform: translateY(-140%);
  background: #050609;
  color: #ffffff;
  padding: 0.85em 1.4em;
  margin: 0.5em;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  transition: transform 0.15s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid #7dd3fc;
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .skip-link {
    transition: none;
  }
}

/* --------------------------------------------------------------------------
   Visible focus states
   A strong, consistent :focus-visible treatment for keyboard users across
   links, buttons, form controls, and any custom interactive element.
   Uses outline (not box-shadow) so it is never clipped by overflow:hidden
   ancestors, plus an offset so it reads clearly against dark and light
   backgrounds alike.
   -------------------------------------------------------------------------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible,
[role="button"]:focus-visible,
[role="tab"]:focus-visible {
  outline: 3px solid #7dd3fc;
  outline-offset: 3px;
  border-radius: 4px;
}

/* Fallback for browsers without :focus-visible support: apply the same
   treatment to plain :focus so keyboard users are never left without an
   indicator. */
@supports not selector(:focus-visible) {
  a:focus,
  button:focus,
  input:focus,
  select:focus,
  textarea:focus,
  summary:focus,
  [tabindex]:focus,
  [role="button"]:focus,
  [role="tab"]:focus {
    outline: 3px solid #7dd3fc;
    outline-offset: 3px;
    border-radius: 4px;
  }
}

/* --------------------------------------------------------------------------
   Visually-hidden utility
   Standard "screen-reader only" pattern for text that should be announced
   but not shown on-screen (e.g. accessible names for icon-only controls
   where an aria-label alone isn't already sufficient).
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}