/* blog: index, cards, article layout */
.topbar nav a.on { color: var(--green); }
.blog-hero { padding-bottom: 8px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 24px; }
.chip { background: var(--surface); border: 1px solid var(--border); color: var(--muted); border-radius: 999px; padding: 7px 14px; font: 500 14px var(--sans); cursor: pointer; }
.chip:hover { color: var(--text); border-color: var(--faint); }
.chip.on { background: var(--green); border-color: var(--green); color: #031a0c; }

.post-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.post-card { display: flex; flex-direction: column; gap: 8px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; text-decoration: none; transition: border-color .15s, transform .15s; }
.post-card[hidden] { display: none; }
.post-card:hover { border-color: var(--green-2); transform: translateY(-2px); }
.post-card h3 { margin: 0; font-size: 19px; line-height: 1.25; letter-spacing: -.01em; }
.post-card p { margin: 0; color: var(--muted); font-size: 14px; flex: 1; }
.post-cat { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--green); }
.post-meta { font-size: 12px; color: var(--faint); margin: 0; }

.article-head { max-width: 760px; padding: 48px 0 28px; display: grid; gap: 10px; }
.article-head h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.08; letter-spacing: -.03em; margin: 0; }
.article-head .lede { margin: 0; }
.crumb { color: var(--muted); text-decoration: none; font-size: 14px; }
.crumb:hover { color: var(--green); }

.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 48px; align-items: start; border-top: 1px solid var(--border); padding-top: 32px; }
.article-side { position: sticky; top: 84px; display: grid; gap: 16px; }
.toc ol { margin: 8px 0 0; padding-left: 18px; display: grid; gap: 6px; font-size: 14px; color: var(--faint); }
.toc a { color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--green); }
.cta { padding: 18px; }
.cta p { margin: 6px 0 14px; font-size: 14px; color: var(--muted); }
.cta .btn { display: inline-block; text-decoration: none; }

.prose { max-width: 70ch; font-size: 17px; line-height: 1.7; color: #cfded5; }
.prose h2 { font-size: 26px; letter-spacing: -.02em; color: var(--text); margin: 40px 0 10px; scroll-margin-top: 84px; line-height: 1.2; }
.prose h3 { font-size: 19px; color: var(--text); margin: 28px 0 6px; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--text); }
.prose a { color: var(--green); }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); border: 1px solid var(--border); border-radius: 5px; padding: 1px 5px; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); }
.prose th { color: var(--text); font-weight: 600; }
.prose td.n, .prose th.n { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; margin: 0 0 18px; }
.table-scroll table { margin: 0; min-width: 480px; }
.callout { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--green); border-radius: 10px; padding: 14px 18px; margin: 0 0 18px; font-size: 16px; }
.callout p:last-child { margin: 0; }
.formula { font-family: var(--mono); font-size: 15px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin: 0 0 16px; color: var(--text); overflow-x: auto; }
.prose .sources-note { font-size: 14px; color: var(--faint); border-top: 1px solid var(--border); padding-top: 14px; margin-top: 32px; }
.prose .sources-note a { color: var(--muted); }

@media (max-width: 960px) {
  .post-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-grid { grid-template-columns: 1fr; gap: 24px; }
  .article-side { position: static; order: -1; }
  .toc { display: none; }
}
@media (max-width: 620px) {
  .post-grid { grid-template-columns: 1fr; }
  .prose { font-size: 16px; }
  .topbar nav { gap: 14px; }
}
.prose th, .prose td { font-family: var(--sans); font-size: 15px; }
.prose td.n, .prose th.n { font-family: var(--mono); }
.blog-hero { padding-top: 36px; }

/* breadcrumbs */
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; margin: 0; padding: 0; list-style: none; font-size: 13px; color: var(--faint); }
.crumbs li { display: flex; align-items: center; min-width: 0; }
.crumbs li + li::before { content: '›'; margin: 0 8px; color: var(--faint); }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--green); }
.crumbs [aria-current="page"] { color: var(--faint); max-width: 40ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: block; }