.intro.reference-opening{background:var(--intro-paper);transition:background-color .3s,opacity .6s;animation:none}.reference-opening.is-covered{background:var(--intro-splat)}.reference-opening.is-leaving{opacity:0;pointer-events:none}.reference-opening video{object-fit:contain;width:100%;height:100%;position:absolute;inset:0}.reference-opening .opening-fallback{width:min(420px,70vw);height:auto;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.reference-opening .intro-skip{color:var(--foreground);animation:none}.reference-opening.is-covered .intro-skip{color:var(--intro-paper)}@media (prefers-reduced-motion:reduce){.intro.reference-opening{transition:opacity .3s}}