:root {
  --paper: #ffffff;
  --paper-deep: #f8fafc;
  --ink: #0f172a;
  --ink-soft: #334155;
  --ink-muted: #64748b;
  --rule: #e2e8f0;
  --rule-soft: #f1f5f9;
  --blue: #2563eb;
  --blue-deep: #1e3a8a;
  --orange: #ff6b00;
  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Outfit", "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.reading-shell { width: min(760px, calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: fixed; top: -60px; left: 16px; z-index: 100; padding: 10px 14px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 16px; }

.blog-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.91);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(16px) saturate(160%);
}
.blog-header-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.blog-brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-size: 21px; }
.blog-brand svg { flex: none; }
.blog-brand span { color: var(--ink-muted); font-style: italic; }
.blog-nav { display: flex; align-items: center; gap: 25px; font-size: 13px; color: var(--ink-soft); }
.blog-nav a { padding: 8px 0; }
.blog-nav .book { padding: 9px 17px; border-radius: 999px; background: var(--orange); color: #fff; font-weight: 600; }

.blog-index-hero { padding: clamp(72px, 10vw, 132px) 0 64px; }
.eyebrow {
  display: inline-block;
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--blue);
}
.blog-index-hero h1,
.article-hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: .94;
  letter-spacing: -.035em;
}
.blog-index-hero h1 { max-width: 13ch; font-size: clamp(58px, 9vw, 112px); }
.blog-index-hero h1 em,
.article-hero h1 em { color: var(--ink-soft); font-weight: 400; }
.blog-index-lede { max-width: 58ch; margin-top: 30px; color: var(--ink-soft); font-size: 18px; }

.article-list { padding: 0 0 110px; }
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--rule); }
.article-card {
  min-height: 430px;
  padding: clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 34px;
  border-right: 1px solid var(--rule);
  transition: background .25s, color .25s;
}
.article-card:last-child { border-right: 0; }
.article-card:hover { background: var(--ink); color: #fff; }
.article-card:hover .card-number,
.article-card:hover .card-topic,
.article-card:hover p,
.article-card:hover .card-meta { color: rgba(255,255,255,.7); }
.card-number, .card-topic, .card-meta { font-family: var(--mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-muted); }
.card-topic { display: block; margin-bottom: 18px; color: var(--blue); }
.article-card h2 { max-width: 16ch; font-family: var(--serif); font-size: clamp(32px, 3.2vw, 44px); line-height: 1; font-weight: 400; letter-spacing: -.025em; }
.article-card p { max-width: 52ch; margin-top: 22px; color: var(--ink-soft); font-size: 14.5px; }
.card-meta { padding-top: 18px; display: flex; justify-content: space-between; border-top: 1px solid currentColor; }

.article-hero { padding: clamp(62px, 9vw, 118px) 0 58px; border-bottom: 1px solid var(--rule); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 40px; font-family: var(--mono); font-size: 9.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-muted); }
.breadcrumb a:hover { color: var(--blue); }
.article-hero h1 { max-width: 16ch; font-size: clamp(54px, 8.5vw, 102px); }
.article-hero h1.article-title-long { max-width: 19ch; font-size: clamp(50px, 7vw, 88px); }
.article-deck { max-width: 66ch; margin-top: 30px; color: var(--ink-soft); font-family: var(--serif); font-size: clamp(22px, 2.6vw, 31px); line-height: 1.25; }
.article-byline {
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: repeat(3, auto) 1fr;
  gap: 28px;
  align-items: end;
  font-size: 12.5px;
}
.meta-block span { display: block; font-family: var(--mono); font-size: 9px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-muted); }
.meta-block strong { display: block; margin-top: 3px; font-weight: 500; }
.meta-block small { display: block; margin-top: 2px; color: var(--ink-muted); font-size: 10.5px; }
.author-link { border-bottom: 1px solid rgba(37,99,235,.35); }
.author-link:hover { color: var(--blue); }
.evidence-note { justify-self: end; max-width: 34ch; color: var(--ink-muted); text-align: right; font-size: 11.5px; }
.article-visual {
  margin-top: 44px;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 24px;
  background: var(--paper-deep);
}
.article-visual img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.article-visual figcaption { padding: 10px 16px; color: var(--ink-muted); font-size: 11.5px; }

.article-layout { position: relative; padding: 70px 0 110px; }
.article-body { color: var(--ink-soft); }
.article-body > p:first-of-type { font-size: 20px; line-height: 1.65; color: var(--ink); }
.article-body p { margin: 0 0 23px; }
.article-body h2 {
  margin: 72px 0 23px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(39px, 5vw, 57px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.025em;
}
.article-body h3 { margin: 37px 0 14px; color: var(--ink); font-size: 20px; line-height: 1.3; }
.article-body strong { color: var(--ink); }
.article-body a:not(.article-cta) { color: var(--blue-deep); border-bottom: 1px solid rgba(37,99,235,.28); }
.article-body ul, .article-body ol { margin: 0 0 25px 1.25rem; }
.article-body li { margin-bottom: 9px; padding-left: 5px; }
.article-body sup a { border-bottom: 0; font-family: var(--mono); font-size: 9px; }

.article-toc {
  margin-bottom: 32px;
  padding: 19px 22px;
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  align-items: start;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: var(--paper);
}
.article-toc > strong {
  padding-top: 2px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.article-toc ol { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 7px 24px; list-style-position: inside; }
.article-toc li { margin: 0; padding: 0; color: var(--ink-muted); font-size: 12.5px; }
.article-toc a { border-bottom: 0 !important; color: var(--ink-soft) !important; }
.article-toc a:hover { color: var(--blue) !important; }

.answer-box {
  margin: 0 0 38px;
  padding: 28px 30px;
  border-radius: 18px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}
.answer-box > span { color: var(--blue); font-family: var(--mono); font-size: 9.5px; letter-spacing: .11em; text-transform: uppercase; }
.answer-box h2 { margin: 9px 0 14px; font-size: clamp(31px, 4vw, 43px); }
.answer-box p { margin: 0; color: var(--ink-soft); font-size: 17px; line-height: 1.6; }

.key-points {
  margin: 36px 0 52px;
  padding: 28px 30px;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--blue);
}
.key-points h2 { margin: 0 0 17px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--blue); }
.key-points ul { margin-bottom: 0; }
.key-points li:last-child { margin-bottom: 0; }
.clinical-callout {
  margin: 40px 0;
  padding: 28px;
  background: var(--ink);
  color: rgba(255,255,255,.8);
}
.clinical-callout strong { display: block; margin-bottom: 8px; color: #fff; font-family: var(--serif); font-size: 27px; font-weight: 400; }
.clinical-callout p:last-child { margin-bottom: 0; }
.clinical-callout a { color: #bfdbfe !important; border-bottom-color: rgba(191,219,254,.5) !important; }
.warning-callout {
  margin: 40px 0;
  padding: 25px 28px;
  border: 1px solid #fdba74;
  background: #fff7ed;
  color: #7c2d12;
}
.warning-callout strong { color: #7c2d12; }

.evidence-table { width: 100%; margin: 32px 0 42px; border-collapse: collapse; border-top: 1px solid var(--rule); text-align: left; }
.evidence-table caption { padding-bottom: 10px; color: var(--ink-muted); font-size: 11.5px; text-align: left; }
.evidence-table thead th { padding: 10px 0; border-bottom: 1px solid var(--rule); color: var(--ink-muted); font-family: var(--mono); font-size: 9px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }
.evidence-table tbody th,
.evidence-table tbody td { padding: 20px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.evidence-table tbody th { width: 134px; padding-right: 24px; color: var(--blue); font-family: var(--mono); font-size: 10px; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; }
.evidence-table tbody td { color: var(--ink-soft); font-size: 14px; }

.references { margin-top: 80px; padding-top: 38px; border-top: 2px solid var(--ink); }
.references h2 { margin-top: 0; }
.references ol { margin-left: 1.2rem; }
.references li { margin-bottom: 17px; padding-left: 8px; font-size: 13.5px; line-height: 1.55; overflow-wrap: anywhere; }
.references em { color: var(--ink-muted); }
.editorial-note { margin-top: 38px; padding: 22px 24px; background: var(--paper-deep); border: 1px solid var(--rule); color: var(--ink-muted); font-size: 12.5px; }

.article-cta {
  margin-top: 62px;
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background: var(--blue);
  color: #fff;
  border-radius: 22px;
}
.article-cta span { display: block; font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.7); }
.article-cta strong { display: block; margin-top: 4px; color: #fff; font-family: var(--serif); font-size: 28px; font-weight: 400; }
.article-cta b { flex: none; font-size: 25px; }

.blog-footer { padding: 54px 0; background: var(--ink); color: #fff; }
.blog-footer-inner { display: flex; justify-content: space-between; gap: 40px; align-items: flex-end; }
.footer-name { font-family: var(--serif); font-size: 30px; }
.footer-copy { max-width: 42ch; margin-top: 8px; color: rgba(255,255,255,.58); font-size: 12.5px; }
.footer-links { display: flex; gap: 20px; color: rgba(255,255,255,.7); font-size: 12.5px; }

@media (max-width: 760px) {
  .shell, .reading-shell { width: min(100% - 36px, 760px); }
  .blog-header-inner { min-height: 60px; }
  .blog-brand { font-size: 18px; }
  .blog-brand span, .blog-nav a:not(.book) { display: none; }
  .blog-nav { gap: 0; }
  .blog-nav .book { padding: 8px 13px; font-size: 11px; }
  .blog-index-hero { padding: 56px 0 42px; }
  .blog-index-hero h1 { font-size: 57px; }
  .blog-index-lede { margin-top: 23px; font-size: 15.5px; }
  .article-list { padding-bottom: 70px; }
  .article-grid { grid-template-columns: 1fr; }
  .article-card { min-height: 0; padding: 26px 22px; border-right: 0; border-bottom: 1px solid var(--rule); }
  .article-card:last-child { border-bottom: 0; }
  .article-card h2 { font-size: 38px; }
  .article-hero { padding: 42px 0 38px; }
  .breadcrumb { margin-bottom: 26px; }
  .article-hero h1 { font-size: clamp(50px, 15vw, 67px); }
  .article-hero h1.article-title-long { font-size: clamp(46px, 13vw, 60px); }
  .article-deck { margin-top: 23px; font-size: 21px; }
  .article-byline { grid-template-columns: 1fr 1fr; gap: 18px; }
  .evidence-note { grid-column: 1 / -1; justify-self: start; text-align: left; }
  .article-visual { margin-top: 30px; border-radius: 16px; }
  .article-visual figcaption { padding: 9px 12px; font-size: 10.5px; }
  .article-layout { padding: 46px 0 76px; }
  .article-body > p:first-of-type { font-size: 18px; }
  .article-body h2 { margin-top: 56px; font-size: 41px; }
  .article-toc { grid-template-columns: 1fr; gap: 10px; padding: 17px 18px; }
  .article-toc ol { grid-template-columns: 1fr; gap: 5px; }
  .answer-box { padding: 22px 20px; margin-left: -4px; margin-right: -4px; }
  .answer-box h2 { margin-top: 8px; font-size: 34px; }
  .answer-box p { font-size: 15.5px; }
  .key-points, .clinical-callout, .warning-callout { padding: 22px 20px; margin-left: -4px; margin-right: -4px; }
  .evidence-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .evidence-table tbody,
  .evidence-table tr,
  .evidence-table tbody th,
  .evidence-table tbody td { display: block; width: 100%; }
  .evidence-table tr { padding: 18px 0; border-bottom: 1px solid var(--rule); }
  .evidence-table tbody th,
  .evidence-table tbody td { padding: 0; border: 0; }
  .evidence-table tbody th { margin-bottom: 7px; }
  .article-cta { padding: 25px 22px; }
  .article-cta strong { font-size: 23px; }
  .blog-footer-inner { align-items: flex-start; flex-direction: column; }
  .footer-links { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}