.article-body { background: #fff; }
.article-shell { width: min(1040px, calc(100% - 48px)); margin-inline: auto; }
.article-hero {
  padding: 54px 0 62px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 88% 14%, rgba(146, 240, 207, .28), transparent 31%),
    linear-gradient(180deg, #f5f7fb 0%, #fff 100%);
}
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 46px; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--blue); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.article-kicker { margin-bottom: 14px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.article-hero h1 { max-width: 870px; margin-bottom: 24px; font-size: clamp(44px, 6vw, 72px); line-height: 1.02; }
.article-lead { max-width: 840px; margin-bottom: 32px; color: var(--ink-soft); font-size: clamp(19px, 2vw, 23px); line-height: 1.55; }
.article-summary { max-width: 860px; padding: 24px 26px; border: 1px solid #bfd0ff; border-radius: 18px; background: #f5f7ff; }
.article-summary > strong { display: block; margin-bottom: 8px; color: var(--blue-deep); }
.article-summary p { margin: 0; }
.article-layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 70px; padding-block: 64px 92px; }
.article-toc { position: sticky; top: 112px; align-self: start; display: grid; gap: 12px; padding: 20px; border: 1px solid var(--line); border-radius: 17px; background: var(--paper); }
.article-toc strong { margin-bottom: 3px; font-size: 14px; }
.article-toc a { color: var(--ink-soft); font-size: 13px; text-decoration: none; }
.article-toc a:hover { color: var(--blue); }
.article-content { min-width: 0; }
.article-content section { scroll-margin-top: 100px; margin-bottom: 66px; }
.article-content h2 { margin-bottom: 22px; font-size: clamp(29px, 4vw, 42px); line-height: 1.1; letter-spacing: -.035em; }
.article-content h3 { font-size: 19px; }
.article-content p, .article-content li { color: var(--ink-soft); }
.article-content em { color: var(--ink); }
.rule-steps { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; }
.rule-steps li { display: grid; grid-template-columns: 42px 1fr; gap: 18px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; }
.rule-steps li > span { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px; background: var(--ink); color: #fff; font-weight: 850; }
.rule-steps h3 { margin: 1px 0 7px; color: var(--ink); }
.rule-steps p { margin: 0; }
.rule-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.rule-card { padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: var(--paper); }
.rule-card-blue { border-color: #cdd7ff; background: #f2f4ff; }
.rule-label { display: inline-block; margin-bottom: 15px; color: var(--blue-deep); font-size: 13px; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; }
.rule-card p { margin-bottom: 12px; }
.rule-card ul { margin: 0; padding-left: 21px; }
.exception-note, .article-note { margin-top: 18px; padding: 18px 20px; border-left: 4px solid var(--aqua-dark); border-radius: 0 12px 12px 0; background: #ecfbf6; }
.example-list { display: grid; gap: 0; margin-top: 20px; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.example-list p { margin: 0; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.example-list p:last-child { border-bottom: 0; }
.comparison-table { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; }
.comparison-table table { width: 100%; border-collapse: collapse; min-width: 620px; }
.comparison-table th, .comparison-table td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison-table th { background: var(--paper); color: var(--ink); font-size: 13px; }
.comparison-table tr:last-child td { border-bottom: 0; }
.self-check-list { display: grid; gap: 12px; margin-bottom: 22px; }
.self-check-list details { border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.self-check-list summary { cursor: pointer; padding: 19px 21px; color: var(--ink); font-weight: 750; }
.self-check-list details[open] summary { border-bottom: 1px solid var(--line); }
.self-check-list details p { margin: 0; padding: 18px 21px; }
.sources-section { padding-top: 34px; border-top: 1px solid var(--line); }
.sources-section ul { display: grid; gap: 11px; padding-left: 21px; }
.sources-section a { color: var(--blue-deep); text-underline-offset: 3px; }
.sources-section > p { font-size: 13px; }
.article-cta { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 30px; border-radius: 24px; background: var(--ink); color: #fff; }
.article-cta span { color: var(--aqua); font-size: 13px; font-weight: 800; text-transform: uppercase; }
.article-cta h2 { margin: 6px 0 8px; color: #fff; font-size: 30px; }
.article-cta p { max-width: 560px; margin: 0; color: #b6c0d8; }
.article-cta .button { flex: 0 0 auto; color: #fff; }
.article-body .footer-brand { text-decoration: none; }

@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; gap: 36px; }
  .article-toc { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-toc strong { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .article-shell { width: min(100% - 32px, 1040px); }
  .article-hero { padding: 38px 0 48px; }
  .breadcrumbs { margin-bottom: 32px; }
  .article-layout { padding-block: 42px 70px; }
  .article-toc, .rule-grid { grid-template-columns: 1fr; }
  .article-toc strong { grid-column: auto; }
  .article-content section { margin-bottom: 52px; }
  .rule-steps li { grid-template-columns: 38px 1fr; padding: 18px; }
  .rule-steps li > span { width: 38px; height: 38px; }
  .article-cta { align-items: stretch; flex-direction: column; }
  .article-cta .button { width: 100%; }
}