:root {
  --reference-ink: #111111;
  --reference-muted: #667085;
  --reference-line: #d9d9d6;
  --reference-paper: #ffffff;
  --reference-soft: #f5f6f8;
  --reference-blue: #2b6bff;
  --reference-radius: 4px;
}

.reference-page {
  color: var(--reference-ink);
  background: var(--reference-paper);
}

.reference-main {
  min-height: 68vh;
  padding: 40px 0 88px;
}

.reference-shell {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.reference-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  color: var(--reference-muted);
  font-size: 13px;
}

.reference-breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.reference-breadcrumb a:hover,
.reference-breadcrumb a:focus-visible {
  color: var(--reference-blue);
}

.reference-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: end;
  padding: 16px 0 32px;
  border-bottom: 1px solid var(--reference-ink);
}

.reference-eyebrow,
.reference-kicker {
  margin: 0 0 10px;
  color: var(--reference-blue);
  font-size: 12px;
  font-weight: 700;
}

.reference-hero h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(32px, 4.2vw, 58px);
  font-weight: 500;
  line-height: 1.08;
}

.reference-hero__intro {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--reference-muted);
  font-size: 16px;
  line-height: 1.75;
}

.reference-status {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 10px;
  border: 1px solid var(--reference-line);
  border-radius: 999px;
  color: #4b5563;
  font-size: 12px;
  white-space: nowrap;
}

.reference-status.is-reviewed {
  border-color: #9bb8ff;
  color: #1749bd;
  background: #f2f6ff;
}

.reference-route {
  margin: 36px 0 0;
}

.reference-route h2,
.reference-section h2 {
  margin: 0;
  font-size: 26px;
  font-weight: 500;
}

.reference-route__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--reference-ink);
  border-bottom: 1px solid var(--reference-line);
  list-style: none;
}

.reference-route__item {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--reference-line);
}

.reference-route__item:last-child {
  border-right: 0;
}

.reference-route__index {
  display: block;
  margin-bottom: 24px;
  color: var(--reference-blue);
  font-size: 12px;
}

.reference-route__item h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
}

.reference-route__item p {
  display: -webkit-box;
  min-height: 44px;
  margin: 10px 0 18px;
  overflow: hidden;
  color: var(--reference-muted);
  font-size: 14px;
  line-height: 1.6;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.reference-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--reference-ink);
  font-weight: 700;
  text-decoration: none;
}

.reference-link::after {
  content: "↗";
  color: var(--reference-blue);
}

.reference-link:hover,
.reference-link:focus-visible {
  color: var(--reference-blue);
}

.reference-filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 28px 0 0;
}

.reference-filter-row a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--reference-line);
  border-radius: 999px;
  color: var(--reference-ink);
  font-size: 13px;
  text-decoration: none;
}

.reference-filter-row a:hover,
.reference-filter-row a:focus-visible {
  border-color: var(--reference-blue);
  color: var(--reference-blue);
}

.reference-section {
  padding: 52px 0 0;
}

.reference-section__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--reference-ink);
}

.reference-section__heading p {
  margin: 0;
  color: var(--reference-muted);
  font-size: 13px;
}

.reference-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.reference-list__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  min-height: 112px;
  padding: 20px 0;
  border-bottom: 1px solid var(--reference-line);
}

.reference-list__meta {
  color: var(--reference-muted);
  font-size: 12px;
}

.reference-list__body {
  min-width: 0;
}

.reference-list__body h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
}

.reference-list__body p {
  display: -webkit-box;
  max-width: 760px;
  margin: 7px 0 0;
  overflow: hidden;
  color: var(--reference-muted);
  font-size: 14px;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.reference-related {
  padding: 56px 0 0;
}

.reference-related__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
  border-top: 1px solid var(--reference-ink);
}

.reference-related__item {
  min-width: 0;
  padding: 22px 20px 22px 0;
  border-right: 1px solid var(--reference-line);
}

.reference-related__item + .reference-related__item {
  padding-left: 20px;
}

.reference-related__item:last-child {
  border-right: 0;
}

.reference-related__item span {
  color: var(--reference-blue);
  font-size: 12px;
}

.reference-related__item h3 {
  margin: 10px 0 0;
  font-size: 17px;
  line-height: 1.45;
}

.formula-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 28px 0 0;
  border-top: 1px solid var(--reference-ink);
}

.formula-index__item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 220px;
  padding: 24px;
  border-right: 1px solid var(--reference-line);
  border-bottom: 1px solid var(--reference-line);
}

[data-structure-card][hidden] {
  display: none;
}

.formula-index__item:nth-child(2n) {
  border-right: 0;
}

.formula-index__item h2 {
  margin: 14px 0 0;
  font-size: 21px;
  line-height: 1.4;
}

.formula-index__item p {
  display: -webkit-box;
  margin: 10px 0 20px;
  overflow: hidden;
  color: var(--reference-muted);
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.formula-index__item .reference-link {
  margin-top: auto;
}

.formula-sheet {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.7fr);
  gap: 48px;
  padding-top: 36px;
}

.formula-sheet__equation {
  margin: 0 0 28px;
  padding: 28px;
  border: 1px solid var(--reference-ink);
  background: var(--reference-soft);
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.formula-sheet h2 {
  margin: 36px 0 12px;
  font-size: 22px;
  font-weight: 600;
}

.formula-sheet p,
.formula-sheet li,
.formula-sheet dd {
  color: #3f4754;
  line-height: 1.75;
}

.formula-sheet ul {
  margin: 0;
  padding-left: 20px;
}

.formula-symbols {
  margin: 0;
}

.formula-symbols div {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--reference-line);
}

.formula-symbols dt {
  font-weight: 700;
}

.formula-symbols dd {
  margin: 0;
}

.formula-aside {
  align-self: start;
  padding: 22px;
  border: 1px solid var(--reference-line);
  background: var(--reference-soft);
}

.formula-aside h2 {
  margin-top: 0;
}

.formula-example {
  padding: 18px;
  border-left: 3px solid var(--reference-blue);
  background: #f7f9ff;
}

.formula-sources {
  word-break: break-word;
}

.structure-detail-page .reference-hero {
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
}

.structure-detail__preview {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--reference-line);
  background: var(--reference-soft);
  overflow: hidden;
}

.structure-detail__preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.structure-data {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 34px 0 0;
  border-top: 1px solid var(--reference-ink);
  border-bottom: 1px solid var(--reference-line);
}

.structure-data__item {
  min-width: 0;
  padding: 20px;
  border-right: 1px solid var(--reference-line);
}

.structure-data__item:last-child {
  border-right: 0;
}

.structure-data__item span {
  display: block;
  color: var(--reference-muted);
  font-size: 12px;
}

.structure-data__item strong {
  display: block;
  margin-top: 8px;
  font-size: 18px;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.structure-detail__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  padding-top: 36px;
}

.structure-panel {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--reference-line);
}

.structure-panel h2 {
  margin: 0 0 18px;
  font-size: 21px;
}

.structure-panel dl {
  margin: 0;
}

.structure-panel dl div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--reference-line);
}

.structure-panel dt {
  color: var(--reference-muted);
}

.structure-panel dd {
  margin: 0;
  line-height: 1.6;
}

.structure-figure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding-top: 36px;
}

.structure-figure-grid figure {
  margin: 0;
}

.structure-figure-grid img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  border: 1px solid var(--reference-line);
  background: var(--reference-soft);
}

.structure-figure-grid figcaption {
  margin-top: 10px;
  color: var(--reference-muted);
  font-size: 13px;
}

.structure-notice {
  margin-top: 32px;
  padding: 18px 20px;
  border-left: 3px solid var(--reference-blue);
  background: #f7f9ff;
  color: #3f4754;
  line-height: 1.7;
}

.catalog-card__summary,
.catalog-card p,
.knowledge-resource-card p {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.catalog-card,
.knowledge-resource-card {
  min-height: 0;
}

@media (max-width: 860px) {
  .reference-shell {
    width: min(100% - 32px, 1200px);
  }

  .reference-hero,
  .structure-detail-page .reference-hero {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .reference-route__list,
  .reference-related__grid,
  .formula-index,
  .formula-sheet,
  .structure-detail__grid {
    grid-template-columns: 1fr;
  }

  .reference-route__item,
  .reference-related__item,
  .reference-related__item + .reference-related__item,
  .formula-index__item,
  .formula-index__item:nth-child(2n) {
    padding: 20px 0;
    border-right: 0;
    border-bottom: 1px solid var(--reference-line);
  }

  .reference-list__item {
    grid-template-columns: 62px minmax(0, 1fr);
  }

  .reference-list__item .reference-link {
    grid-column: 2;
    justify-self: start;
  }

  .structure-data {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .structure-data__item:nth-child(2) {
    border-right: 0;
  }

  .structure-data__item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--reference-line);
  }
}

@media (max-width: 560px) {
  .reference-main {
    padding: 24px 0 64px;
  }

  .reference-shell {
    width: min(100% - 24px, 1200px);
  }

  .reference-hero {
    padding-bottom: 24px;
  }

  .reference-hero h1 {
    font-size: 34px;
  }

  .reference-section {
    padding-top: 40px;
  }

  .reference-section__heading {
    display: block;
  }

  .reference-section__heading p {
    margin-top: 8px;
  }

  .reference-list__item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .reference-list__item .reference-link {
    grid-column: auto;
  }

  .structure-data {
    grid-template-columns: 1fr;
  }

  .structure-data__item,
  .structure-data__item:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid var(--reference-line);
  }

  .structure-figure-grid {
    grid-template-columns: 1fr;
  }

  .structure-panel dl div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}