/* One cell scale per viewport, shared by every board in this article. */
#article-body {
  --tetra-cell: 40px;
}

#article-body .tetrasquares-figure {
  margin: 1.5em 0 2em;
}

#article-body .tetrasquares-gallery {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 24px;
  margin: 0 0 1rem;
}

#article-body .tetrasquares-steps {
  display: grid;
  grid-template-columns: repeat(2, calc(4 * var(--tetra-cell)));
}

#article-body .square-4 { --cells: 4; }
#article-body .square-6 { --cells: 6; }
#article-body .square-8 { --cells: 8; }

#article-body .tetrasquares-card {
  flex: none;
  width: calc(var(--cells) * var(--tetra-cell));
  color: #111;
  background: #fff7df;
  box-shadow: 4px 4px #bd1e2b;
}

#article-body .tetrasquares-card img {
  display: block;
  box-sizing: border-box;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1;
  margin: 0;
  border: 0;
  border-radius: 0;
}

#article-body .tetrasquares-label,
#article-body .tetrasquares-value {
  display: block;
  padding: 5px 2px;
  border: 3px solid #111;
  color: #111;
  font-family: system-ui, sans-serif;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
}

#article-body .tetrasquares-label {
  background: #ffe447;
  border-bottom: 0;
}

#article-body .tetrasquares-value {
  border-top: 0;
}

#article-body .tetrasquares-figure figcaption {
  font-size: .95em;
  line-height: 1.5;
}

#article-body table:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 3px;
}

@media (max-width: 700px) {
  #article-body { --tetra-cell: 32px; }
  #article-body .tetrasquares-gallery { gap: 20px; }
}

@media (max-width: 360px) {
  #article-body { --tetra-cell: 28px; }
  #article-body .tetrasquares-gallery { gap: 16px; }
}