.layana-case-study .article-index {
  overflow: hidden;
  margin: 1.5rem 0 0;
  border: 1px solid var(--j-rule);
  border-radius: 4px;
  background: #fff;
}

.layana-case-study .article-index-summary {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: #fff;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background 0.2s;
}

.layana-case-study .article-index-summary:hover {
  background: #fafaf9;
}

.layana-case-study .article-index-summary::-webkit-details-marker {
  display: none;
}

.layana-case-study .article-index-summary::before {
  content: "+";
  flex-shrink: 0;
  color: var(--j-orange);
  font-size: 0.95rem;
  font-weight: 700;
  transition: transform 0.2s;
}

.layana-case-study details.article-index[open] .article-index-summary::before {
  transform: rotate(45deg);
}

.layana-case-study details.article-index[open] .article-index-summary {
  border-bottom: 1px solid var(--j-rule);
}

.layana-case-study .article-index-heading {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.layana-case-study .article-index-kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--j-orange);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.layana-case-study .article-index-kicker::before {
  content: "";
  display: block;
  flex-shrink: 0;
  width: 18px;
  height: 1px;
  background: var(--j-orange);
}

.layana-case-study .article-index-title {
  color: var(--j-blue);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.layana-case-study .article-index-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  padding: 1px;
  background: var(--j-rule);
}

.layana-case-study .article-index-list a {
  position: relative;
  display: block;
  padding: 0.95rem 1rem 0.95rem 1.15rem;
  background: #fff;
  color: var(--j-blue);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.55;
  transition: background 0.2s, color 0.2s;
}

.layana-case-study .article-index-list a:hover {
  background: #eef2f8;
  opacity: 1;
}

.layana-case-study .article-index-list a::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: transparent;
  transition: background 0.2s;
}

.layana-case-study .article-index-list a:hover::before {
  background: var(--j-orange);
}

.layana-case-study .callout {
  position: relative;
  margin: 1.5rem 0 0;
  padding: 1.6rem 1.8rem;
  border: 1.5px solid var(--j-rule);
  border-radius: 3px;
  background: #fff;
}

.layana-case-study .callout::before {
  content: attr(data-label);
  position: absolute;
  top: -0.6rem;
  left: 1.3rem;
  padding: 0 0.5rem;
  background: #fff;
  color: var(--j-orange);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.layana-case-study .callout ul {
  list-style: none;
}

.layana-case-study .callout li {
  display: flex;
  gap: 0.7rem;
  padding: 0.42rem 0;
  color: #444;
  font-size: 0.93rem;
  line-height: 1.6;
}

.layana-case-study .callout li::before {
  content: "";
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--j-orange);
}

.layana-case-study .callout li strong {
  color: var(--j-blue);
}

@media (max-width: 640px) {
  .layana-case-study .article-index-list {
    grid-template-columns: 1fr;
  }
}