/* CSP-safe image viewer overlay */
#img-viewer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: none; /* created then displayed via JS */
  align-items: center;
  justify-content: center;
  z-index: 100000;
}
#img-viewer-overlay.open { display: flex; }
#img-viewer-overlay .img-wrap {
  max-width: 96vw;
  max-height: 96vh;
}
#img-viewer-overlay img {
  display: block;
  max-width: 96vw;
  max-height: 96vh;
  width: auto;
  height: auto;
}
#img-viewer-overlay button.viewer-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  background: #e11900; /* vivid red for visibility */
  border: 2px solid rgba(255,255,255,0.6);
  border-radius: 9999px;
  color: #fff;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.45);
  text-shadow: 0 1px 1px rgba(0,0,0,0.25);
  z-index: 100001; /* above image inside overlay */
}
#img-viewer-overlay button.viewer-close:hover {
  background: #ff2d20;
}
#img-viewer-overlay button.viewer-close:active {
  transform: scale(0.98);
}
#img-viewer-overlay button.viewer-close:focus {
  outline: 3px solid #fff;
  outline-offset: 2px;
}