/* shared/progress.css — SCROLL PROGRESS BAR (P-5).
   Promoted site-wide from Brief 01 so every page carries the identical
   chrome signature. Fixed 3px bar at the very top, grows L→R with scroll
   and reverses on upscroll. Decorative (the bar is aria-hidden).
   The width update is a compositor-only scaleX with no easing transition,
   so it tracks scroll position 1:1 and is inherently reduced-motion-safe.
   z-index sits above every nav (Home nav = 100, brief nav = 60). */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 101;
  background: transparent;
  pointer-events: none;
}
.progress__fill {
  height: 100%;
  width: 100%;
  background: var(--color-brand-purple);
  transform: scaleX(0);
  transform-origin: left center;
}