.comparison-frame{--position:50%;position:relative;isolation:isolate;aspect-ratio:1008/565;overflow:hidden;cursor:ew-resize;touch-action:pan-y;user-select:none;-webkit-user-select:none;background:#101820}
/* Shared viewport in normal-photo coordinates: x=8..1016, y=45..610.
   Percentages scale registration consistently at every desktop and phone width. */
.comparison-frame img{position:absolute;left:-.7936507937%;top:-7.9646017699%;display:block;width:101.5873015873%;height:auto;max-width:none;pointer-events:none}
.comparison-illuminated{position:absolute;inset:0;clip-path:inset(0 0 0 var(--position));z-index:1}
/* Affine fit from corresponding physical features, with translation expressed
   relative to the original 1024 x 768 image. Clip the parent, not the shifted image. */
.comparison-illuminated img{transform-origin:0 0;transform:translate(-.2713563229%,-5.847681184%) matrix(1.0072835092,.0017683182,-.0090302658,1.0019426975,0,0)}
.comparison-divider{position:absolute;top:0;bottom:0;left:var(--position);width:2px;transform:translateX(-50%);background:#fff;box-shadow:0 0 0 1px rgba(16,24,32,.35);z-index:2;pointer-events:none}
.comparison-divider span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:48px;height:48px;border:2px solid #fff;border-radius:50%;background:#102e43;color:#fff;box-shadow:0 2px 12px rgba(0,0,0,.35);font:26px/1 Arial,sans-serif}
.comparison-range{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;pointer-events:none}
.comparison-frame:focus-within{outline:3px solid currentColor;outline-offset:5px}
.comparison-frame:focus-within .comparison-divider span{outline:3px solid #102e43;outline-offset:3px}

.compare{min-width:0;margin:0}.compare-head{display:flex;justify-content:space-between;gap:14px;font-size:13px;line-height:1.5;margin-bottom:12px}.compare figcaption{font-size:13px;line-height:1.6;margin-top:12px;color:var(--muted)}.fluorescence-callout{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.comparison-divider span{width:42px;height:42px;font-size:23px}@media(max-width:600px){.compare-head{font-size:12px}.compare figcaption{font-size:12px}.comparison-divider span{width:36px;height:36px;font-size:20px}}