/**
 * Fixed full-viewport ambient layer rendered behind the app shell:
 * slow-drifting aurora blobs tinted by the active accent, a fading
 * grid, and a film-grain overlay. Disabled via data-ambiance="off".
 */
export function AmbientBackground() {
  return (
    <div aria-hidden className="pointer-events-none fixed inset-0 -z-10 overflow-hidden">
      <div className="ambient-grid" />
      <div className="aurora aurora-1" />
      <div className="aurora aurora-2" />
      <div className="aurora aurora-3" />
      <div className="grain" />
    </div>
  );
}