.product-history {
  max-width: 860px;
  margin-inline: auto;
}
.product-history-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin: 12px 0 32px;
}
.product-history-heading > div {
  min-width: 0;
}
.product-history-heading h1 {
  margin: 4px 0 8px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  overflow-wrap: anywhere;
}
.product-history-heading p {
  margin: 6px 0;
  overflow-wrap: anywhere;
}
.product-history-heading > button {
  flex-shrink: 0;
  min-height: 44px;
}
.product-history-variant {
  font-size: 16px;
}
.product-history-intro {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px 16px;
}
.product-history-intro h2 {
  margin: 0;
  font-size: 19px;
}
.product-history-intro p,
.product-history-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}
.product-history-note {
  margin: 12px 0 18px;
}
.product-research-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.product-research-result {
  display: block;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: inherit;
  text-decoration: none;
  overflow-wrap: anywhere;
}
.product-research-result:hover {
  border-color: var(--teal);
}
.product-research-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}
.product-research-latest {
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--mint);
  color: var(--teal);
}
.product-research-result h3 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 9px 0 12px;
  font-size: 18px;
  line-height: 1.4;
}
.product-research-result svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.product-research-source-date,
.product-research-evidence {
  margin: 5px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}
.product-research-open {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 600;
}
.product-history-empty {
  padding: 24px;
}
.frozen-research-notice {
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--mint);
  font-size: 13px;
  line-height: 1.6;
}
.frozen-research-notice p {
  margin: 0 0 10px;
}
.frozen-research-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.related-research-link {
  display: flex;
  align-items: center;
  gap: 7px;
  width: fit-content;
  min-height: 44px;
  color: var(--teal);
  font-weight: 600;
}
.related-research-link svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}
.tabs.frozen-research-tabs {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
@media (max-width: 600px) {
  .product-history-heading {
    flex-direction: column;
    gap: 14px;
    margin-bottom: 24px;
  }
  .product-research-result {
    padding: 16px;
  }
}