.article-hero {
  padding: 140px 0 48px;
  background: linear-gradient(135deg, var(--section-bg) 0%, var(--white) 100%);
  border-bottom: 1px solid var(--border);
}

.article-hero .container {
  max-width: var(--container-narrow);
}

.article-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--primary-50);
  border: 1px solid var(--primary-100);
  padding: 6px 12px;
  border-radius: 100px;
}

.article-hero h1 {
  max-width: 900px;
  margin: 16px 0 20px;
  font-size: clamp(2rem, 4.4vw, 3.25rem);
}

.article-deck {
  max-width: 760px;
  font-size: 1.125rem;
  color: var(--text-light);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  margin-top: 24px;
  font-size: 0.875rem;
  color: var(--text-light);
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-meta svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
}

.article-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  padding: 56px 0 100px;
  min-width: 0;
}

.article-toc {
  position: sticky;
  top: 100px;
  min-width: 0;
}

.article-toc-inner {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.article-toc-heading,
.article-toc-summary {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin: 0;
}

.article-toc-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.article-toc-summary::-webkit-details-marker {
  display: none;
}

.article-toc-summary::marker {
  content: '';
}

.article-toc-summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.article-toc-chevron {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.article-toc-details[open] .article-toc-chevron {
  transform: rotate(180deg);
}

.article-toc-details nav {
  margin-top: 14px;
}

.article-toc ol {
  list-style: none;
  counter-reset: toc;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.article-toc li {
  counter-increment: toc;
}

.article-toc a {
  display: block;
  position: relative;
  padding: 7px 0 7px 28px;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--text);
  border-radius: var(--radius-sm);
}

.article-toc a::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 7px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
}

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

.article-content {
  max-width: 800px;
  min-width: 0;
}

.article-toc::-webkit-scrollbar {
  width: 8px;
}

.article-toc::-webkit-scrollbar-track {
  background: var(--section-bg);
  border-radius: 100px;
}

.article-toc::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 100px;
}

.article-toc::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

.article-content section {
  scroll-margin-top: 100px;
}

.article-content h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 48px 0 16px;
}

.article-content > section:first-child > h2 {
  margin-top: 0;
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 30px 0 12px;
}

.article-content p {
  font-size: 1.0625rem;
  margin-bottom: 18px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 20px 22px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.article-content li strong {
  color: var(--dark);
}

.article-content strong {
  color: var(--dark);
}

.article-content a {
  color: var(--primary);
  font-weight: 500;
}

.article-content a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.key-takeaways {
  background: var(--primary-50);
  border: 1px solid var(--primary-100);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 0 0 32px;
}

.key-takeaways h2 {
  margin: 0 0 12px;
  font-size: 1.125rem;
}

.key-takeaways ul {
  margin-bottom: 0;
}

.article-callout {
  background: var(--section-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 28px 0;
}

.article-callout p:last-child {
  margin-bottom: 0;
}

.article-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin: 24px 0 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.article-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: var(--white);
}

.article-table th {
  background: var(--section-bg);
  text-align: left;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.article-table td {
  padding: 14px 18px;
  font-size: 0.9375rem;
  color: var(--text-light);
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table td:first-child {
  color: var(--dark);
  font-weight: 600;
}

.article-faq details {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0 20px;
  margin-bottom: 10px;
}

.article-faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--dark);
}

.article-faq summary::-webkit-details-marker {
  display: none;
}

.article-faq summary::after {
  content: '+';
  font-size: 1.25rem;
  line-height: 1;
  color: var(--primary);
  flex-shrink: 0;
}

.article-faq details[open] summary::after {
  content: '-';
}

.article-faq details p {
  margin: 0;
  padding-bottom: 18px;
  font-size: 0.9375rem;
}

.article-footer-note {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

@media (min-width: 1025px) {
  .article-layout {
    padding: 24px 0 32px;
  }

  .article-toc {
    position: sticky;
    top: 100px;
    align-self: start;
    max-height: calc(100vh - 124px);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
  }

  .article-toc-details > summary {
    display: none;
  }
}

@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .article-toc {
    position: static;
    max-height: none;
    overflow-y: visible;
  }

  .article-toc-heading {
    display: none;
  }

  .article-toc ol {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 20px;
  }

  .article-content {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .article-hero {
    padding: 120px 0 36px;
  }

  .article-toc ol {
    grid-template-columns: 1fr;
  }

  .article-content h2 {
    margin-top: 36px;
  }

  .key-takeaways,
  .article-callout {
    padding: 20px;
  }
}