/** Scrolls a section into view and moves focus there for keyboard users. */
export function scrollToSection(id: string) {
  const target = document.getElementById(id);
  if (!target) return;

  const reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
  target.scrollIntoView({
    behavior: reduced ? "auto" : "smooth",
    block: "start",
  });

  if (history.replaceState) history.replaceState(null, "", `#${id}`);
  target.focus({ preventScroll: true });
}