.steel-visual-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  width: min(calc(100% - 10vw), 1380px);
  margin: clamp(3rem, 6vw, 6rem) auto 0;
}

.steel-visual-grid figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: #fff;
}

.steel-visual-grid img {
  display: block;
  width: 100%;
  height: auto;
}

.steel-expandable-grid {
  counter-reset: steel-card;
  list-style: none;
  padding-inline: 0;
}

.steel-expandable-grid > li {
  counter-increment: steel-card;
  display: flex;
  min-width: 0;
}

.steel-expandable-card {
  width: 100%;
  min-width: 0;
}

.steel-expandable-card > summary {
  min-height: 182px;
  padding: clamp(1.15rem, 2.6vw, 1.95rem);
  padding-right: clamp(4.5rem, 7vw, 6rem);
}

.steel-expandable-card > summary::before {
  display: block;
  margin: 0 0 .7rem;
  color: var(--deep);
  content: counter(steel-card, decimal-leading-zero);
  font-weight: 700;
  letter-spacing: .08em;
}

.steel-expandable-grid > li:nth-child(even) > .steel-expandable-card {
  border-color: #6485aa;
  background: #6485aa;
  color: #fff;
}

.steel-expandable-grid > li:nth-child(even) > .steel-expandable-card > summary:hover {
  background: #55779d;
}

.steel-expandable-grid > li:nth-child(even) > .steel-expandable-card > summary::before {
  color: #fff;
}

.steel-expandable-grid > li:nth-child(even) .expandable-card__icon {
  border-color: #fff;
  color: #fff;
}

.steel-expandable-grid > li:nth-child(even) .expandable-card__content {
  border-color: rgba(255, 255, 255, .32);
}

.steel-expandable-grid > li:nth-child(even) > .steel-expandable-card[open] {
  background: #6485aa;
  color: #fff;
}

.steel-visual-grid + .topic-grid {
  padding-top: 1.25rem;
}

.steel-detail {
  max-width: 1080px;
}

.steel-detail h3 {
  margin: 2.25rem 0 .8rem;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.15;
}

.steel-detail a {
  color: #3f4b8f;
  font-weight: 700;
  text-underline-offset: .18em;
}

.steel-detail strong {
  font-weight: 700;
}

@media (max-width: 700px) {
  .steel-visual-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    width: calc(100% - 24px);
    margin-top: 3rem;
  }

  .steel-visual-grid + .topic-grid {
    padding-top: 1rem;
  }

  .steel-expandable-card > summary {
    min-height: 100px;
    padding: 1rem 4.5rem 1rem 1rem;
  }
}