:root {
  --encyclopedia-surface: rgba(255, 255, 255, 0.78);
  --encyclopedia-subtle-surface: rgba(228, 241, 247, 0.58);
  --encyclopedia-border: rgba(40, 72, 92, 0.13);
  --encyclopedia-link: var(--accent);
  --encyclopedia-title-underline: rgba(31, 111, 143, 0.35);
  --encyclopedia-hover-border: rgba(31, 111, 143, 0.42);
  --encyclopedia-shadow: 0 1rem 2.5rem rgba(29, 60, 78, 0.07);
}

.encyclopedia-topics {
  padding-top: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

.encyclopedia-topic-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.4rem;
  color: inherit;
  background: var(--encyclopedia-surface);
  border: 1px solid var(--encyclopedia-border);
  border-radius: 1.25rem;
  box-shadow: var(--encyclopedia-shadow);
}

.encyclopedia-topic-card h3,
.encyclopedia-topic-card p {
  margin: 0;
}

.encyclopedia-topic-card h3 a {
  color: inherit;
  text-decoration-color: var(--encyclopedia-title-underline);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

.encyclopedia-topic-card p {
  color: var(--muted);
}

.encyclopedia-topic-links {
  display: grid;
  gap: 0.55rem;
  margin: 0.35rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--encyclopedia-border);
  list-style: none;
}

.encyclopedia-topic-links a {
  color: var(--encyclopedia-link);
  font-weight: 650;
  line-height: 1.35;
}

.encyclopedia-section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
}

.encyclopedia-section-heading .secondary-link {
  flex: 0 0 auto;
}

.encyclopedia-breadcrumbs {
  margin-bottom: 1.5rem;
  font-size: 0.93rem;
}

.encyclopedia-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.encyclopedia-breadcrumbs li + li::before {
  margin-right: 0.5rem;
  color: var(--muted);
  content: "/";
}

.encyclopedia-breadcrumbs a {
  color: var(--encyclopedia-link);
}

.article-toc {
  max-width: 48rem;
  margin: 0 auto 2rem;
  padding: 1.2rem 1.35rem;
  background: var(--encyclopedia-subtle-surface);
  border: 1px solid var(--encyclopedia-border);
  border-radius: 1rem;
}

.article-toc h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.article-toc ol {
  display: grid;
  gap: 0.4rem;
  margin: 0;
  padding-left: 1.2rem;
}

.article-toc a {
  color: var(--encyclopedia-link);
}

.related-guides {
  max-width: 56rem;
  margin: 3rem auto 0;
}

.related-guides > h2 {
  margin-bottom: 1rem;
}

.related-guides-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.related-guides-grid a {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1rem;
  color: inherit;
  text-decoration: none;
  background: var(--encyclopedia-surface);
  border: 1px solid var(--encyclopedia-border);
  border-radius: 1rem;
}

.related-guides-grid a:hover,
.related-guides-grid a:focus-visible {
  border-color: var(--encyclopedia-hover-border);
}

.related-guides-grid span:last-child {
  color: var(--muted);
  font-size: 0.94rem;
}

.encyclopedia-hub-hero .article-hero-copy {
  max-width: 48rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --encyclopedia-surface: rgba(21, 39, 56, 0.94);
    --encyclopedia-subtle-surface: rgba(18, 35, 51, 0.9);
    --encyclopedia-border: rgba(169, 196, 218, 0.2);
    --encyclopedia-link: var(--brand-strong);
    --encyclopedia-title-underline: rgba(141, 183, 255, 0.58);
    --encyclopedia-hover-border: rgba(141, 183, 255, 0.55);
    --encyclopedia-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.22);
  }
}

@media (max-width: 760px) {
  .encyclopedia-index-hero h1 {
    max-width: none;
    overflow-wrap: normal;
    font-size: clamp(3.1rem, 13vw, 3.6rem);
    word-break: normal;
  }

  .encyclopedia-hub-hero h1 {
    max-width: none;
    overflow-wrap: normal;
    font-size: clamp(2.7rem, 10.8vw, 3.4rem);
    word-break: normal;
  }

  .encyclopedia-topic-grid,
  .related-guides-grid {
    grid-template-columns: 1fr;
  }

  .encyclopedia-section-heading {
    align-items: start;
    flex-direction: column;
  }

  .article-toc {
    margin-inline: 1rem;
  }
}