.lightbox.hidden { display: none; }
.lightbox {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.85);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
}
.lightbox img {
  max-width: 92vw; max-height: 92vh; border-radius: 8px;
  box-shadow: 0 10px 40px rgba(0,0,0,.6);
}
.lightbox__close {
  position: absolute; top: 12px; right: 16px;
  font-size: 32px; line-height: 1; background: transparent; border: 0; color: #fff; cursor: pointer;
}
.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff; font-size: 28px;
  width: 44px; height: 44px; border-radius: 9999px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.lightbox__prev { left: 16px; }
.lightbox__next { right: 16px; }
body.lb-open { overflow: hidden; }