.article__content .rust-diagram {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  max-width: none;
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
  counter-reset: rust-step;
}

.article__content .rust-diagram > li {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
  counter-increment: rust-step;
}

.article__content .rust-diagram > li::before {
  content: counter(rust-step);
  display: grid;
  width: 1.55rem;
  height: 1.55rem;
  margin-bottom: 0.35rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-link);
  color: var(--color-background);
  font-size: 0.9rem;
  font-weight: 700;
}

.rust-diagram__icon {
  display: block;
  width: 100%;
  max-width: 13rem;
  height: auto;
  margin: 0 auto 0.5rem;
}

.rust-diagram__water {
  fill: var(--color-link);
  fill-opacity: 0.2;
  stroke: var(--color-link);
}

.rust-diagram__metal {
  fill: var(--color-text-muted);
}

.rust-diagram__oxygen,
.rust-diagram__electron {
  fill: var(--color-surface);
  stroke: var(--color-focus);
  stroke-width: 2;
}

.rust-diagram__iron-ion {
  fill: var(--color-link-strong);
}

.rust-diagram__electron {
  fill: var(--color-focus);
}

.rust-diagram__rust {
  fill: var(--color-focus);
}

.rust-diagram__line {
  fill: none;
  stroke: var(--color-text);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
}

.rust-diagram__arrow {
  fill: none;
  stroke: var(--color-link-strong);
  stroke-linecap: round;
  stroke-width: 3;
}

.rust-diagram__label {
  fill: var(--color-text);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 12px;
  font-weight: 700;
  text-anchor: middle;
}

.rust-diagram__label--inverse {
  fill: var(--color-background);
}

.rust-diagram__heading,
.rust-diagram__copy {
  display: block;
  margin: 0;
}

.rust-diagram__heading {
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.rust-diagram__copy {
  margin-top: 0.25rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.article__content .rust-diagram > li:not(:last-child)::after {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: -0.85rem;
  display: grid;
  width: 1.4rem;
  height: 1.4rem;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-background);
  color: var(--color-text);
  content: "→";
  font-size: 1rem;
  line-height: 1;
  transform: translate(50%, -50%);
}

.rust-diagram-figure figcaption {
  max-width: 44rem;
}

@media (max-width: 40rem) {
  .article__content .rust-diagram {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.35rem;
  }

  .article__content .rust-diagram > li {
    display: grid;
    grid-template-columns: minmax(4.5rem, 6rem) minmax(0, 1fr);
    column-gap: 0.85rem;
    align-items: center;
  }

  .article__content .rust-diagram > li::before {
    grid-column: 1;
    grid-row: 1;
    margin: 0 0 0.25rem;
  }

  .rust-diagram__icon {
    grid-column: 1;
    grid-row: 2 / span 2;
    margin: 0;
  }

  .rust-diagram__heading,
  .rust-diagram__copy {
    grid-column: 2;
  }

  .article__content .rust-diagram > li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -1.35rem;
    content: "↓";
    transform: translate(50%, 50%);
  }
}