/* Shared reading shell. Back-to-top and highlight-pulse remain compatibility helpers; original rule order and declarations are unchanged. */
/* Article system */
.article-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  align-items: start;
}

.main {
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 4px 20px rgba(14, 42, 71, 0.02);
}

/* Breadcrumbs are owned by components/breadcrumbs.css through main.css. */

/* Meta */
.meta {
  font-size: var(--reading-caption-size);
  line-height: var(--reading-caption-leading);
  color: var(--muted);
  margin-bottom: var(--space-sm);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-sm);
}

:where(.main) h1 {
  font-family: var(--font-heading);
  color: var(--heading-text);
  font-size: var(--reading-h1-size);
  line-height: var(--reading-h1-leading);
  margin-bottom: var(--space-md);
  font-weight: var(--reading-heading-weight);
  letter-spacing: -0.02em;
}

:where(.main) h2 {
  font-family: var(--font-heading);
  color: var(--heading-text);
  font-size: var(--reading-h2-size);
  line-height: var(--reading-h2-leading);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
  font-weight: var(--reading-heading-weight);
  letter-spacing: -0.015em;
}

:where(.main) h3 {
  font-family: var(--font-heading);
  color: var(--heading-text);
  font-size: var(--reading-h3-size);
  line-height: var(--reading-h3-leading);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
  font-weight: var(--reading-heading-weight);
  letter-spacing: -0.01em;
}

:where(.main) p {
  margin-bottom: var(--space-sm);
}

:where(.main) a {
  color: var(--link-color);
  text-decoration: underline;
  text-decoration-color: var(--link-underline);
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
  font-weight: inherit;
  transition: color var(--motion-fast) var(--motion-ease), text-decoration-color var(--motion-fast) var(--motion-ease);
}

:where(.main) a:hover {
  color: var(--accent-hover);
  text-decoration-color: var(--accent-hover);
}

:where(.main) ul,
:where(.main) ol {
  margin-bottom: 18px;
  padding-inline-start: var(--reading-list-indent);
  list-style-position: outside;
}

:where(.main) :where(ul, ol) > li {
  margin-bottom: var(--reading-list-item-gap);
}

/* Nested reading lists keep the article marker instead of browser hollow circles. */
:where(.main) ul {
  list-style-type: disc;
}

:where(.main) ul > li::marker {
  color: var(--block-accent, var(--accent));
}

/* In-article shortcuts differ from links to another page or a source. */
:where(.main) a[href^="#"]:not(:where([class~="card"], [class~="ui-action"], [class~="card-action-btn"], [class~="skip-link"])) {
  text-decoration-style: dashed;
}

:where(.main) [id] {
  scroll-margin-top: 100px;
}

/* Back to top */
.back-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--reading-caption-size);
  line-height: var(--reading-caption-leading);
  color: var(--muted);
  margin-top: 16px;
  font-weight: 600;
  transition: color 0.15s ease;
  cursor: pointer;
}

.back-top:hover {
  color: var(--accent);
}

.highlight-pulse-active { background-color: var(--bg); border-radius: var(--control-radius); }

@media (max-width: 1100px) {
  .article-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
}

@media (max-width: 600px) {
  .article-container {
    padding: 20px 10px 60px;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .main {
    padding: 28px 16px;
    border-radius: 12px;
  }

  :where(.main) h1 {
    margin-bottom: 16px;
  }

  :where(.main) h2 {
    margin-top: 36px;
    padding-top: 24px;
  }

}