:root{--lens-d:240px}
.kz-lens{
  position:fixed; left:0; top:0; width:var(--lens-d); height:var(--lens-d);
  border-radius:50%; pointer-events:none; will-change:transform,opacity;
  transform:translate3d(-100px,-100px,0) scale(.01); opacity:0;
  z-index:2147483647; mix-blend-mode:difference; /* 軽量フォールバック */
  backdrop-filter:none!important; -webkit-backdrop-filter:none!important;
  border:2px solid rgba(255,255,255,.85);
}
body.lens-on .kz-lens{opacity:1}
@supports (-webkit-hyphens:none){ .lens{display:none!important} } /* Safariでは既存レンズを無効化 */
@media (prefers-reduced-motion:reduce){.kz-lens{transition:none!important}}