.guide-main {
  min-height: 60vh;
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(22rem, 1.12fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 7rem);
  padding-block: 5.5rem 6rem;
}

.guide-hero h1,
.article-header h1 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.05em;
  line-height: 1.02;
  text-wrap: balance;
}

.guide-hero h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 6vw, 4.8rem);
}

.guide-hero-copy > p:not(.context-label) {
  max-width: 35rem;
  margin: 1.4rem 0 0;
  color: var(--ink-muted);
  font-size: 1.06rem;
  line-height: 1.7;
  text-wrap: pretty;
}

.guide-hero figure {
  margin: 0;
}

.guide-hero img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  display: block;
  object-fit: cover;
  border-radius: 0.625rem;
}

.guide-hero figcaption {
  margin-top: 0.65rem;
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.guide-library {
  padding-block: 1rem 8rem;
}

.library-intro {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}

.library-intro h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.library-intro p {
  margin: 1rem 0 0;
  color: var(--ink-muted);
  line-height: 1.65;
}

.guide-index {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 0 3rem;
  border-top: 1px solid var(--line-strong);
}

.guide-link {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 1rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: color 160ms ease, padding-inline 160ms ease, background-color 160ms ease;
}

.guide-link:first-child {
  grid-row: span 2;
  align-content: center;
  min-height: 15rem;
  padding-right: 2rem;
  border-right: 1px solid var(--line);
}

.guide-link:hover {
  padding-inline: 0.75rem;
  background: var(--surface);
  color: var(--accent);
}

.guide-link-copy {
  min-width: 0;
}

.guide-link h3 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.guide-link:first-child h3 {
  max-width: 16ch;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  line-height: 1.08;
}

.guide-link p {
  max-width: 38rem;
  margin: 0.65rem 0 0;
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.6;
  text-wrap: pretty;
}

.guide-link-meta {
  display: block;
  margin-top: 0.85rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.guide-link-arrow {
  color: var(--accent);
  font-size: 1.2rem;
}

.guide-topic-directory {
  margin-top: 7rem;
  padding-top: 4rem;
  border-top: 1px solid var(--line-strong);
}

.directory-heading {
  max-width: 44rem;
  margin-bottom: 3rem;
}

.directory-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.directory-heading > p:last-child {
  margin: 1rem 0 0;
  color: var(--ink-muted);
  line-height: 1.65;
}

.topic-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4rem 5rem;
}

.topic-group {
  border-top: 1px solid var(--line-strong);
}

.topic-group-wide {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 5rem;
}

.topic-group h3 {
  margin: 0;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.topic-group-wide h3 {
  grid-column: 1 / -1;
}

.topic-group a {
  min-height: 3.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 160ms ease, padding-inline 160ms ease, background-color 160ms ease;
}

.topic-group a:hover {
  padding-inline: 0.65rem;
  background: var(--surface);
  color: var(--accent);
}

.topic-group small {
  flex: 0 0 auto;
  color: var(--ink-muted);
  font-size: 0.68rem;
}

.article-header {
  max-width: 58rem;
  padding-block: 4.5rem 3rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 2rem;
  color: var(--ink-muted);
  font-size: 0.78rem;
}

.breadcrumbs a {
  text-underline-offset: 0.25em;
}

.breadcrumbs span[aria-hidden="true"] {
  color: var(--line-strong);
}

.article-header h1 {
  max-width: 17ch;
  font-size: clamp(2.8rem, 6vw, 4.8rem);
}

.article-deck {
  max-width: 45rem;
  margin: 1.35rem 0 0;
  color: var(--ink-muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.65;
  text-wrap: pretty;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin-top: 1.5rem;
  color: var(--ink-muted);
  font-size: 0.78rem;
}

.article-visual {
  max-width: 58rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1.4rem;
  margin-bottom: 4rem;
  padding: 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.625rem;
  background: var(--surface-accent);
}

.article-visual strong,
.article-visual span {
  display: block;
}

.article-visual strong {
  font-family: var(--mono);
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-variant-numeric: tabular-nums;
}

.article-visual span {
  margin-top: 0.3rem;
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.article-visual .visual-operator {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 1.5rem;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 46rem) minmax(13rem, 1fr);
  align-items: start;
  gap: clamp(3rem, 8vw, 8rem);
  padding-bottom: 7rem;
}

.article-body {
  min-width: 0;
}

.article-body > :first-child {
  margin-top: 0;
}

.article-body h2 {
  margin: 3.4rem 0 1rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.035em;
  line-height: 1.12;
  scroll-margin-top: 6rem;
}

.article-body h3 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
  scroll-margin-top: 6rem;
}

.article-body p,
.article-body li {
  color: var(--ink-muted);
  line-height: 1.78;
}

.article-body p {
  margin: 0 0 1.2rem;
  text-wrap: pretty;
}

.article-body strong {
  color: var(--ink);
}

.article-body ul,
.article-body ol {
  margin: 1rem 0 1.5rem;
  padding-left: 1.25rem;
}

.article-body li + li {
  margin-top: 0.55rem;
}

.formula-block {
  margin: 1.7rem 0;
  padding: 1.2rem 1.3rem;
  border-left: 3px solid var(--accent);
  background: var(--surface-accent);
}

.formula-block strong {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  font-variant-numeric: tabular-nums;
}

.formula-block span {
  display: block;
  margin-top: 0.5rem;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.worked-example,
.policy-note-box {
  margin: 2rem 0;
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--surface);
}

.worked-example h3,
.policy-note-box h3 {
  margin-top: 0;
}

.policy-note-box {
  border-color: var(--line-strong);
  background: var(--surface-muted);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin: 1.6rem 0 2rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

.article-table {
  width: 100%;
  min-width: 34rem;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.article-table th,
.article-table td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-table th {
  background: var(--surface-muted);
  color: var(--ink);
  font-size: 0.75rem;
}

.article-table td {
  color: var(--ink-muted);
  font-size: 0.84rem;
}

.article-table tr:last-child td {
  border-bottom: 0;
}

.article-toc {
  position: sticky;
  top: 6rem;
  padding-left: 1.2rem;
  border-left: 1px solid var(--line-strong);
}

.article-toc strong {
  display: block;
  margin-bottom: 0.8rem;
  font-size: 0.8rem;
}

.article-toc a {
  display: block;
  padding: 0.35rem 0;
  color: var(--ink-muted);
  font-size: 0.78rem;
  line-height: 1.45;
  text-decoration: none;
}

.article-toc a:hover {
  color: var(--accent);
}

.source-list {
  padding-left: 1.1rem;
}

.source-list a {
  color: var(--accent);
  text-underline-offset: 0.25em;
}

.related-guides {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line-strong);
}

.related-guides h2 {
  margin-top: 0;
}

.related-guides a {
  display: block;
  padding: 0.8rem 0;
  color: var(--ink);
  font-weight: 600;
  text-underline-offset: 0.3em;
}

@media (max-width: 56rem) {
  .guide-hero,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .guide-hero {
    gap: 2.5rem;
  }

  .guide-hero figure {
    max-width: 43rem;
  }

  .article-toc {
    position: static;
    grid-row: 1;
    padding: 1rem 1.1rem;
    border: 1px solid var(--line);
    border-radius: 0.5rem;
    background: var(--surface);
  }

  .article-toc nav {
    columns: 2;
    column-gap: 2rem;
  }
}

@media (max-width: 42.5rem) {
  .guide-hero {
    padding-block: 3.7rem 4.5rem;
  }

  .guide-hero h1,
  .article-header h1 {
    font-size: clamp(2.55rem, 12vw, 3.6rem);
  }

  .guide-library {
    padding-bottom: 5.5rem;
  }

  .guide-index {
    grid-template-columns: 1fr;
  }

  .topic-groups,
  .topic-group-wide {
    grid-template-columns: 1fr;
  }

  .topic-group-wide h3,
  .topic-group-wide {
    grid-column: auto;
  }

  .guide-topic-directory {
    margin-top: 4.5rem;
    padding-top: 3rem;
  }

  .topic-group a {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.2rem;
  }

  .guide-link:first-child {
    grid-row: auto;
    min-height: 0;
    padding-right: 0;
    border-right: 0;
  }

  .guide-link:first-child h3 {
    font-size: 1.35rem;
  }

  .article-header {
    padding-block: 3rem 2.3rem;
  }

  .article-visual {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .article-visual .visual-operator {
    transform: rotate(90deg);
    transform-origin: center;
  }

  .article-layout {
    gap: 2.5rem;
    padding-bottom: 5rem;
  }

  .article-toc nav {
    columns: 1;
  }

  .article-toc {
    display: none;
  }
}