.article-header {
  padding-block: clamp(38px, 7vw, 72px) 34px;
}

.article-header__inner {
  max-width: 900px;
}

.article-header h1 {
  max-width: 900px;
  margin: 12px 0 16px;
  font-size: clamp(30px, 5vw, 46px);
  letter-spacing: -0.025em;
}

.article-deck {
  max-width: 760px;
  margin: 0 0 20px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 19px);
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  color: var(--color-subtle);
  font-size: 14px;
}

.article-hero {
  padding-bottom: clamp(36px, 6vw, 56px);
}

.article-hero__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 21 / 9;
  border-radius: var(--radius-card);
  background: var(--color-surface-soft);
}

.article-hero__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-layout {
  display: grid;
  min-width: 0;
  padding-bottom: clamp(64px, 10vw, 110px);
}

.toc-desktop {
  display: none;
}

.toc-mobile {
  margin-bottom: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.toc-mobile summary {
  padding: 14px 18px;
  color: var(--color-heading);
  font-weight: 600;
  cursor: pointer;
}

.toc-mobile__links {
  display: grid;
  max-height: 55vh;
  gap: 2px;
  padding: 0 18px 16px;
  overflow-y: auto;
}

.toc-link {
  display: block;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  color: var(--color-muted);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
}

.toc-link:hover,
.toc-link.is-active {
  border-left-color: var(--color-accent);
  color: var(--color-accent-deep);
}

.toc-link.is-active {
  font-weight: 600;
}

.article-prose {
  min-width: 0;
  max-width: var(--reading);
  font-size: clamp(16.5px, 1.6vw, 17.5px);
  line-height: 1.78;
}

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

.article-prose h2,
.article-prose h3,
.article-prose h4,
.article-prose h5,
.article-prose h6 {
  scroll-margin-top: calc(var(--header-height) + 22px);
}

.article-prose h2 {
  margin: 2.5em 0 0.75em;
  font-size: clamp(23px, 3vw, 28px);
}

.article-prose h3 {
  margin: 2em 0 0.7em;
  font-size: clamp(19px, 2.4vw, 22px);
}

.article-prose h4,
.article-prose h5,
.article-prose h6 {
  margin: 1.8em 0 0.6em;
  font-size: 18px;
}

.article-prose p,
.article-prose ul,
.article-prose ol,
.article-prose blockquote,
.article-prose .code-block,
.article-prose .table-scroll,
.article-prose .math-block {
  margin-block: 0 1.4em;
}

.article-prose li + li {
  margin-top: 0.48em;
}

.article-prose blockquote {
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--color-accent);
  color: oklch(0.35 0.01 260);
  font-style: italic;
}

.article-prose blockquote > :last-child {
  margin-bottom: 0;
}

.article-prose :not(pre) > code {
  padding: 0.12em 0.36em;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  background: var(--color-surface);
  color: oklch(0.34 0.11 35);
  font-size: 0.86em;
  overflow-wrap: anywhere;
}

.code-block {
  max-width: 100%;
  overflow: hidden;
  border: 1px solid oklch(0.28 0.01 260);
  border-radius: var(--radius-md);
  background: oklch(0.16 0.01 260);
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 14px;
  background: oklch(0.22 0.01 260);
  color: oklch(0.78 0.01 260);
  font-family: var(--font-code);
  font-size: 12px;
}

.code-copy {
  padding: 3px 7px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.code-copy:hover {
  background: oklch(0.3 0.01 260);
}

.code-block pre {
  max-width: 100%;
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  color: oklch(0.92 0.005 90);
  font-size: 13.5px;
  line-height: 1.65;
  tab-size: 2;
}

.table-scroll,
.math-block {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.table-scroll {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.article-prose table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.article-prose th,
.article-prose td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.article-prose th {
  background: var(--color-surface-soft);
  color: var(--color-heading);
  font-weight: 600;
}

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

.math-block {
  padding: 12px 0;
}

.math-block math,
.article-prose math[display='block'] {
  min-width: max-content;
}

.article-prose hr {
  margin-block: 3em;
  border: 0;
  border-top: 1px solid var(--color-border);
}

.article-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.copy-status {
  min-height: 22px;
  color: var(--color-muted);
  font-size: 13px;
}

.related-articles {
  padding-bottom: clamp(64px, 9vw, 96px);
}

.related-articles h2 {
  margin: 0 0 20px;
  font-size: 24px;
}

@media (min-width: 960px) {
  .article-layout {
    grid-template-columns: 220px minmax(0, var(--reading));
    gap: 56px;
    align-items: start;
  }

  .toc-desktop {
    position: sticky;
    top: calc(var(--header-height) + 20px);
    display: block;
    max-height: calc(100vh - var(--header-height) - 40px);
    overflow-y: auto;
  }

  .toc-desktop__label {
    margin-bottom: 12px;
    color: var(--color-subtle);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .toc-mobile {
    display: none;
  }
}