.blog-post img:not(a img) {
  cursor: zoom-in;
}

body:has(.image-viewer[open]) {
  overflow: hidden;
}

.image-viewer {
  max-width: none;
  max-height: none;
  padding: 0;
  border: none;
  background: none;
}

.image-viewer::backdrop {
  background: rgba(0, 0, 0, 0.8);
}

.image-viewer img {
  display: block;
  max-width: 90vw;
  max-height: 90vh;
  /* Keep transparent images readable against the dark backdrop */
  background: white;
}

/* Vector images are upscaled to fill the available space */
.image-viewer img[src$=".svg"] {
  width: min(90vw, 90vh * var(--aspect-ratio));
}

.image-viewer button {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0;
  border: none;
  background: none;
  color: white;
  font-size: 2em;
  line-height: 1;
  opacity: 0.8;
}

.image-viewer button:hover {
  opacity: 1;
}