/* Shared editorial surface for indexable HEA World article pages. */

:root {
  --article-bg: color-mix(in srgb, var(--bg) 84%, var(--surface-2) 16%);
  --article-accent: #d95732;
  --article-teal: #0f766e;
  --article-link: color-mix(in srgb, var(--ink) 78%, var(--article-teal) 22%);
  --article-link-hover: var(--article-accent);
  --article-rail: color-mix(in srgb, var(--surface) 92%, var(--article-teal) 8%);
  --article-warm: color-mix(in srgb, var(--surface) 91%, var(--article-accent) 9%);
}

body.hea-article-page,
body.hea-articles-index-page {
  margin: 0;
  background: var(--article-bg);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body.hea-article-page main,
body.hea-articles-index-page main {
  text-align: left;
}

body.hea-article-page h1,
body.hea-article-page h2,
body.hea-article-page h3,
body.hea-article-page p,
body.hea-article-page li,
body.hea-articles-index-page h1,
body.hea-articles-index-page h2,
body.hea-articles-index-page h3,
body.hea-articles-index-page p,
body.hea-articles-index-page li {
  text-align: left;
}

.article-shell,
.articles-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.article-hero,
.articles-hero {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.article-hero-inner,
.articles-hero-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0 42px;
}

.article-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

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

.article-breadcrumb a:hover {
  color: var(--article-link-hover);
}

.article-kicker {
  margin: 0 0 14px;
  color: var(--article-teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.article-hero h1,
.articles-hero h1 {
  max-width: 860px;
  margin: 0;
  color: var(--ink);
  font-size: 3.25rem;
  line-height: 1.04;
  letter-spacing: 0;
  text-wrap: balance;
}

.article-dek,
.articles-dek {
  max-width: 820px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.16rem;
  line-height: 1.65;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.95rem;
}

.article-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.article-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid color-mix(in srgb, var(--article-accent) 46%, var(--line) 54%);
  border-radius: 8px;
  background: var(--article-accent);
  color: #ffffff;
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.article-button.secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.article-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 300px;
  gap: 56px;
  align-items: start;
  padding: 54px 0 72px;
}

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

.article-cover {
  margin: 0 0 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

.article-cover img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: color-mix(in srgb, var(--surface) 88%, var(--article-warm) 12%);
}

.article-cover figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.article-body {
  color: color-mix(in srgb, var(--ink) 92%, var(--muted) 8%);
  font-size: 1.06rem;
  line-height: 1.76;
}

.article-body p {
  margin: 0 0 1.2em;
}

.article-body h2 {
  margin: 2.2em 0 0.6em;
  color: var(--ink);
  font-size: 1.65rem;
  line-height: 1.18;
  letter-spacing: 0;
}

.article-body h3 {
  margin: 1.8em 0 0.5em;
  color: var(--ink);
  font-size: 1.2rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.35em;
  padding-left: 1.25em;
}

.article-body li {
  margin: 0 0 0.55em;
}

.article-body blockquote {
  margin: 28px 0;
  padding: 0 0 0 20px;
  border-left: 4px solid var(--article-accent);
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.55;
}

.article-body a {
  color: var(--article-link);
  font-weight: 700;
  text-decoration-color: color-mix(in srgb, var(--article-teal) 44%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.article-body a:hover {
  color: var(--article-link-hover);
  text-decoration-color: currentColor;
}

.article-callout {
  margin: 30px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--article-teal);
  border-radius: 0 8px 8px 0;
  background: var(--article-rail);
}

.article-callout strong {
  display: block;
  margin-bottom: 6px;
  color: var(--ink);
}

.article-table-wrap {
  width: 100%;
  margin: 28px 0 34px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.article-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 0.96rem;
  line-height: 1.5;
}

.article-table th,
.article-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-table th {
  color: var(--ink);
  background: color-mix(in srgb, var(--surface-2) 72%, var(--surface) 28%);
  font-weight: 800;
}

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

.article-source-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.article-source-list li {
  margin: 0;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.article-source-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.article-pull {
  margin: 34px 0;
  padding: 26px 28px;
  border: 1px solid color-mix(in srgb, var(--article-accent) 28%, var(--line) 72%);
  border-radius: 8px;
  background: var(--article-warm);
  color: var(--ink);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.42;
}

.article-rail {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 14px;
}

.article-rail-box,
.article-related-card,
.articles-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-xs);
}

.article-rail-box {
  padding: 18px;
}

.article-rail-box h2,
.article-rail-box h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.article-rail-box p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.5;
}

.article-rail-box a {
  color: var(--ink);
  font-weight: 600;
  line-height: 1.35;
  text-decoration: none;
}

.article-rail-box a:hover {
  color: var(--article-link-hover);
}

.article-rail-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-rail-list li {
  margin: 0;
  padding: 9px 0;
  border-top: 1px solid color-mix(in srgb, var(--line) 74%, transparent);
}

.article-rail-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.article-guide-box {
  background: var(--article-warm);
  border-color: color-mix(in srgb, var(--article-accent) 30%, var(--line) 70%);
}

.article-guide-box p {
  margin-bottom: 14px;
}

.article-guide-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid color-mix(in srgb, var(--article-accent) 68%, var(--line) 32%);
  border-radius: 8px;
  background: var(--article-accent);
  color: #ffffff !important;
  font-size: 0.92rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--shadow-xs);
}

.article-guide-action:hover {
  color: #ffffff !important;
  box-shadow: var(--shadow-sm);
}

.article-bottom-band {
  padding: 48px 0 54px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.article-guide-band {
  padding: 48px 0 54px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.article-cta,
.article-guide-band-inner {
  display: grid;
  gap: 18px;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.article-cta h2,
.article-guide-band h2 {
  max-width: 760px;
  margin: 0;
  color: var(--ink);
  font-size: 2rem;
  line-height: 1.16;
  letter-spacing: 0;
}

.article-cta p,
.article-guide-band p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.article-related {
  padding: 54px 0 78px;
}

.article-related h2,
.articles-section h2 {
  margin: 0 0 20px;
  color: var(--ink);
  font-size: 1.9rem;
  line-height: 1.18;
  letter-spacing: 0;
}

.article-related-grid,
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.article-related-card,
.articles-card {
  display: grid;
  align-content: start;
  min-height: 188px;
  padding: 18px;
  color: inherit;
  text-decoration: none;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.article-related-card:hover,
.articles-card[href]:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.article-card-label {
  margin: 0 0 10px;
  color: var(--article-teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.article-related-card h3,
.articles-card h2,
.articles-card h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.article-related-card p,
.articles-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.articles-section {
  padding: 48px 0 72px;
}

.articles-card[aria-disabled="true"] {
  opacity: 0.78;
}

.articles-card[aria-disabled="true"]:hover {
  transform: none;
  box-shadow: var(--shadow-xs);
}

@media (prefers-color-scheme: dark) {
  :root {
    --article-bg: color-mix(in srgb, var(--bg) 86%, var(--surface) 14%);
    --article-rail: color-mix(in srgb, var(--surface) 88%, var(--article-teal) 12%);
    --article-warm: color-mix(in srgb, var(--surface) 88%, var(--article-accent) 12%);
  }

  .article-button.secondary {
    background: var(--surface-2);
  }
}

@media (max-width: 980px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .article-rail {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-related-grid,
  .articles-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .article-hero-inner,
  .articles-hero-inner {
    padding: 38px 0 30px;
  }

  .article-hero h1,
  .articles-hero h1 {
    font-size: 2.1rem;
    line-height: 1.08;
  }

  .article-dek,
  .articles-dek {
    font-size: 1.02rem;
  }

  .article-layout {
    padding: 34px 0 52px;
  }

  .article-body {
    font-size: 1rem;
    line-height: 1.7;
  }

  .article-body h2 {
    font-size: 1.42rem;
  }

  .article-pull {
    padding: 20px;
    font-size: 1.1rem;
  }

  .article-rail,
  .article-related-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .article-actions {
    display: grid;
  }

  .article-button {
    width: 100%;
  }
}