/* Shared divider motion. Native borders remain the no-JS / resting default. */
.line-motion-host { position:relative; }
.scroll-divider {
  position:absolute;
  display:block;
  margin:0;
  padding:0;
  border:0;
  visibility:hidden;
  pointer-events:none;
  transform-origin:left center;
}
.scroll-divider[data-line-state="running"] { visibility:visible; }