.article-header .eyebrow, .article-card-body .eyebrow { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.articles-intro { max-width: 680px; }
.articles-list { margin-top: 36px; }
.article-card { display: grid; grid-template-columns: .6fr 1.4fr; max-width: 980px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); overflow: hidden; }
.article-card-mark { display: flex; flex-direction: column; justify-content: space-between; gap: 36px; padding: 32px; background: var(--accent-soft); color: var(--accent); }
.article-card-mark .ico { width: 36px; height: 36px; }
.article-card-mark span { font-size: clamp(1.3rem,2.4vw,2rem); font-weight: 700; line-height: 1.35; letter-spacing: -.03em; }
.article-card-body { padding: 36px; }
.article-card-body h2 { font-size: 1.8rem; }
.article-card-body h2 a { color: inherit; text-decoration: none; }
.article-card-body h2 a:hover { color: var(--accent); }
.article-card-body .link { margin-top: 12px; }
.article-header { max-width: 800px; margin-bottom: 40px; }
.article-header > .link { margin-bottom: 26px; }
.article-header h1 { font-size: clamp(2.2rem,4.5vw,3.6rem); }
.article-header .lead { margin-top: 20px; }
.article-layout { display: grid; grid-template-columns: minmax(0,1fr) 260px; align-items: start; gap: 64px; }
.article-toc { grid-column: 2; grid-row: 1; position: sticky; top: 96px; border-left: 1px solid var(--line); padding-left: 22px; font-size: .85rem; }
.article-toc b { display: block; margin-bottom: 14px; }
.article-toc ol { padding-left: 18px; margin: 0; color: var(--muted); }
.article-toc li { padding-left: 3px; margin-bottom: 12px; }
.article-toc a { color: inherit; text-decoration: none; }
.article-toc a:hover { color: var(--accent); }
.article-body { grid-column: 1; grid-row: 1; min-width: 0; font-size: 1.03rem; line-height: 1.8; }
.article-body > section { scroll-margin-top: 90px; margin-bottom: 42px; }
.article-body h2 { font-size: clamp(1.4rem,2.7vw,1.9rem); line-height: 1.25; margin-bottom: 20px; }
.article-body h3 { font-size: 1.1rem; margin: 24px 0 10px; }
.article-body p, .article-body ul, .article-body ol { color: var(--muted); }
.article-body li { margin-bottom: 10px; }
.article-body a { color: var(--accent); text-underline-offset: 3px; }
.article-body a.btn { color: var(--accent-ink); }
.article-takeaway { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 20px 24px; margin: 24px 0; border-radius: 0 10px 10px 0; }
.article-takeaway p { color: var(--ink); margin: 8px 0 0; }
.article-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0; }
.article-compare > div { border: 1px solid var(--line); background: var(--card); border-radius: var(--radius); padding: 20px; }
.article-compare h3 { margin-top: 0; }
.article-compare ol { padding-left: 20px; font-size: .92rem; margin-bottom: 0; }
.article-table { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.article-table table { width: 100%; border-collapse: collapse; font-size: .92rem; line-height: 1.55; }
.article-table.wide table { min-width: 640px; }
.article-table th, .article-table td { padding: 12px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); color: var(--muted); }
.article-table th { color: var(--ink); font-weight: 600; background: var(--accent-soft); }
.article-table td:first-child { color: var(--ink); }
.article-table tbody tr:last-child td { border-bottom: 0; }
.article-formula { margin: 24px 0; padding: 20px 24px; border-left: 3px solid var(--accent); background: var(--card); border-radius: 0 10px 10px 0; overflow-x: auto; white-space: pre-wrap; font: .92rem/1.8 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; color: var(--ink); }
.article-next { border-top: 1px solid var(--line); padding-top: 32px; }
@media(max-width:1000px) { .article-layout { grid-template-columns: minmax(0,1fr) 220px; gap: 32px; } }
@media(max-width:760px) {
  .article-card { grid-template-columns: 1fr; }
  .article-card-mark { flex-direction: row; align-items: center; padding: 22px; }
  .article-card-mark span { font-size: 1.3rem; }
  .article-card-body { padding: 24px; }
  .article-card-body h2 { font-size: 1.5rem; }
  .article-header { margin-bottom: 24px; }
  .article-header > .link { margin-bottom: 20px; }
  .article-layout { display: flex; flex-direction: column; align-items: stretch; gap: 32px; }
  .article-toc { position: static; width: 100%; }
  .article-body { font-size: 1rem; }
  .article-body > section { margin-bottom: 32px; }
  .article-compare { grid-template-columns: 1fr; }
  .article-takeaway { padding: 18px; }
}