/* Overview A. All masks and rules are temporary; the static grid stays intact. */
.intro .ov-line-mask, .intro .ov-value-mask { clip-path:inset(-.2em -.25em -.2em -.25em); }
.intro .figures li.ov-cell { position:relative;border-top-color:transparent; }
.intro .ov-rule { position:absolute;top:-1px;left:0;right:0;height:1px;background:var(--rule);transform-origin:left center;pointer-events:none; }
@media (prefers-reduced-motion:reduce) {
  .intro .ov-line-mask, .intro .ov-value-mask { clip-path:none; }
  .intro .figures li.ov-cell { border-top-color:var(--rule); }
  .intro .ov-rule { display:none; }
}