/* Content reveals (headings, numbers): masks installed only by a running motion module. */
.content-number-mask, .content-title-mask { display: block; overflow: clip; }
.content-number-text, .content-title-text { display: block; }
/* Photo entrance: the frame shows in the surface tone until the photo opens inside it; clip keeps the
   enlarged photo out of the page's scroll width. */
.motion-photo { overflow: clip; background: var(--c-surface); }