.cert-lightbox{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.7);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:1000;
  padding:2rem;
}
.cert-lightbox.open{display:flex;}
.cert-lightbox img{
  max-width:90vw;
  max-height:90vh;
  border-radius:16px;
  box-shadow:0 20px 50px rgba(0,0,0,.5);
}
.cert-close{
  position:absolute;
  top:16px;
  right:16px;
  width:44px;height:44px;
  border-radius:9999px;
  border:none;
  background:rgba(255,255,255,.9);
  font-size:28px;
  line-height:1;
  cursor:pointer;
  box-shadow:0 10px 20px rgba(0,0,0,.2);
}
.cert-clickable{
  cursor: zoom-in;
}
body.cert-no-scroll{overflow:hidden;}