/* Article layout and prose */

.article-layout {
  display: grid;
  gap: 2.5rem;
  max-width: 72rem;
  margin-inline: auto;
  padding: 2rem var(--margin-mobile) 4rem;
}

@media (min-width: 1024px) {
  .article-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    padding-inline: var(--gutter);
    align-items: start;
  }
}

.article-toc {
  position: sticky;
  top: 5.5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  padding: 1.25rem;
  background: var(--surface-bright);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.article-toc-title {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.article-toc nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-toc nav li {
  margin: 0;
}

.article-toc nav a {
  display: block;
  padding: 0.35rem 0;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 0.65rem;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.article-toc nav a:hover {
  color: var(--slate-900);
}

.article-toc nav a.is-active {
  color: var(--slate-900);
  font-weight: 600;
  border-left-color: var(--slate-900);
}

.article-header {
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

.article-eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.article-header h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--slate-900);
}

.article-lead {
  margin: 0 0 1rem;
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
}

.article-updated {
  margin: 0;
  font-size: 0.875rem;
  color: var(--slate-400);
}

.article-prose {
  max-width: 42rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--on-surface);
}

.article-prose > * + * {
  margin-top: 1.25rem;
}

.article-prose h2 {
  margin: 2.75rem 0 1rem;
  padding-top: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--slate-900);
  scroll-margin-top: 5.5rem;
}

.article-prose h3 {
  margin: 2rem 0 0.75rem;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--slate-900);
  scroll-margin-top: 5.5rem;
}

.article-prose p {
  margin: 0;
}

.article-prose ul,
.article-prose ol {
  margin: 0;
  padding-left: 1.35rem;
}

.article-prose li + li {
  margin-top: 0.35rem;
}

.article-prose a {
  color: var(--slate-900);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-prose a:hover {
  color: var(--secondary);
}

.article-prose strong {
  font-weight: 600;
  color: var(--slate-900);
}

.article-callout {
  margin: 1.75rem 0;
  padding: 1.25rem 1.35rem;
  background: var(--surface-muted);
  border: 1px solid var(--slate-200);
  border-left: 4px solid var(--slate-900);
  border-radius: var(--radius-lg);
}

.article-callout p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--slate-900);
}

.article-callout-warning {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  border-left-color: var(--warning-amber);
}

.article-callout-tool {
  background: var(--surface-bright);
  border-left-color: var(--tertiary-fixed-dim);
}

.article-table-wrap {
  margin: 1.75rem 0;
  overflow-x: auto;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.article-prose table {
  width: 100%;
  min-width: 32rem;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.article-prose th,
.article-prose td {
  padding: 0.75rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--slate-200);
}

.article-prose th {
  background: var(--surface-muted);
  font-weight: 600;
  color: var(--slate-900);
}

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

.article-cta {
  margin: 2.5rem 0;
  padding: 1.5rem 1.75rem;
  background: var(--slate-900);
  color: var(--on-primary);
  border-radius: var(--radius-xl);
}

.article-cta h2,
.article-cta p {
  margin: 0;
  color: inherit;
}

.article-cta h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.article-cta p {
  font-size: 0.95rem;
  line-height: 1.55;
  opacity: 0.9;
  margin-bottom: 1rem;
}

.article-cta .btn {
  background: var(--surface-bright);
  color: var(--slate-900);
}

.article-cta .btn:hover {
  background: var(--surface-muted);
}

.article-faq details {
  margin: 0;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  background: var(--surface-bright);
}

.article-faq details + details {
  margin-top: 0.5rem;
}

.article-faq summary {
  padding: 1rem 1.15rem;
  font-weight: 600;
  color: var(--slate-900);
  cursor: pointer;
  list-style: none;
}

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

.article-faq summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--slate-400);
}

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

.article-faq .faq-answer {
  padding: 0 1.15rem 1.15rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
}

@media (max-width: 1023px) {
  .article-toc {
    position: static;
    max-height: none;
  }
}