/* One outer transition rhythm. Sticky reading travel belongs to each chapter,
   not to its spacing: leave stage/track heights and animation geometry alone. */
@media(min-width:801px){
  #product{--chapter-gap:clamp(200px,26vh,260px);display:flow-root;padding-bottom:var(--chapter-gap)}
  #product>section+section{margin-block-start:var(--chapter-gap)}
  /* Replace old trailing/leading padding, rather than adding a second gap.
     Saved hero media/text transforms and editor JSON remain untouched. */
  #product>.intro-hero{padding-bottom:0!important}
  #product>.polaroid-chapter>.memento-copy{padding-top:0}
  #product>.map-chapter{padding-block:0}
  #product>.stamp-pair[data-stamp-story=static]{padding-block:0!important}
}