:root {
  --ink: #22333b;
  --muted: #5b6b6f;
  --bg: #eff3f1;
  --bg-deep: #e4ebe7;
  --panel: #f8f9f6;
  --line: rgba(34, 51, 59, .17);
  --accent: #5e8b7e;
  --accent-dark: #3f665e;
  --accent-2: #c7a17a;
  --accent-soft: rgba(94, 139, 126, .11);
  --warm-soft: rgba(199, 161, 122, .18);
  --max: 1180px;
  --radius: 6px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .75rem 1rem; background: var(--ink); color: var(--bg); font-weight: 800; border-radius: 4px; }
.skip-link:focus { top: 1rem; }
.scroll-line { position: fixed; inset: 0 auto auto 0; height: 2px; width: 0; background: var(--accent-2); z-index: 60; }

header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(239, 243, 241, .94);
  backdrop-filter: blur(18px);
}
nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; }
.monogram { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; font-weight: 780; letter-spacing: -.02em; }
.mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 3px; color: var(--bg); background: var(--ink); font-weight: 800; }
.nav-links { display: flex; align-items: center; gap: 1.55rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .9rem; font-weight: 650; }
.nav-links a:hover, .nav-links a:focus-visible, .nav-links a[aria-current="page"] { color: var(--ink); }
.nav-links a[aria-current="page"] { box-shadow: inset 0 -2px var(--accent-2); }
.nav-cta { padding: .62rem .9rem; border: 1px solid var(--line); border-radius: 3px; }

.kicker { margin: 0 0 1rem; color: var(--accent-dark); font-size: .78rem; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.page-hero { padding: clamp(5rem, 10vw, 8rem) 0 clamp(3.5rem, 7vw, 6rem); }
.page-hero h1, .article-hero h1 {
  margin: 0;
  font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif;
  font-weight: 500;
  letter-spacing: -.045em;
}
.page-hero h1 { max-width: 12ch; font-size: clamp(3.5rem, 8vw, 7.5rem); line-height: .94; }
.page-hero .lead { max-width: 62ch; margin: 1.5rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.32rem); }
.topic-bar { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 2.2rem; }
.topic { padding: .5rem .78rem; border: 1px solid var(--line); border-radius: 3px; background: rgba(255,255,255,.35); color: var(--muted); font-size: .8rem; font-weight: 700; }
.topic.active { color: var(--bg); background: var(--accent-dark); border-color: var(--accent-dark); }
.topic { font-family: inherit; cursor: pointer; }
.topic:focus-visible { outline: 2px solid var(--accent-dark); outline-offset: 3px; }
[hidden] { display: none !important; }
.article-card.secondary h2 { font-size: clamp(1.7rem, 2.8vw, 2.6rem); margin-top: 2rem; }
.article-card.secondary p { color: var(--muted); }
.article-card.secondary a { color: var(--accent-dark); }
.section-icon { display: inline-block; margin-right: .3em; font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif; font-size: .7em; vertical-align: .08em; }
.article-image { margin: 2rem 0; }
.article-image img { display: block; width: 100%; height: auto; border-radius: var(--radius); }
.article-image:not(.cover-image) { max-width: 600px; margin-inline: auto; }
.article-image figcaption { margin-top: .7rem; color: var(--muted); font-size: .8rem; line-height: 1.5; }
.cover-image { margin-top: 2.5rem; }
.toc { max-height: calc(100svh - 130px); overflow-y: auto; }
@media (max-width: 900px) { .toc { max-height: none; overflow: visible; } }

.library { padding: 0 0 clamp(5rem, 10vw, 8rem); }
.library-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
.library-head h2 { margin: 0; font-size: 1rem; }
.library-head span { color: var(--muted); font-size: .82rem; }
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.article-card { min-height: 420px; display: flex; flex-direction: column; padding: 1.6rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.article-card.featured { grid-column: span 2; background: var(--ink); color: var(--bg); }
.article-card .meta { display: flex; flex-wrap: wrap; gap: .45rem 1rem; color: var(--muted); font-size: .78rem; }
.article-card.featured .meta { color: #bdc9c5; }
.article-card h2 { max-width: 19ch; margin: auto 0 .9rem; font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif; font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1.05; letter-spacing: -.035em; font-weight: 500; }
.article-card p { max-width: 62ch; margin: 0 0 1.4rem; color: #bdc9c5; }
.article-card a { display: inline-flex; align-items: center; gap: .45rem; color: var(--accent-2); text-decoration: none; font-weight: 750; }
.article-card a:hover, .article-card a:focus-visible { text-decoration: underline; text-underline-offset: 4px; }
.coming-card { justify-content: space-between; background: transparent; }
.coming-card h3 { margin: 0; font-size: 1.2rem; }
.coming-card p { color: var(--muted); }

.article-hero { padding: clamp(4.5rem, 9vw, 7rem) 0 clamp(3rem, 6vw, 5rem); border-bottom: 1px solid var(--line); }
.article-hero-inner { max-width: 930px; }
.breadcrumb { display: inline-flex; align-items: center; gap: .5rem; margin-bottom: 2rem; color: var(--muted); text-decoration: none; font-size: .84rem; font-weight: 700; }
.breadcrumb:hover, .breadcrumb:focus-visible { color: var(--ink); }
.article-hero h1 { max-width: 17ch; font-size: clamp(3rem, 7vw, 6.4rem); line-height: .96; }
.article-deck { max-width: 760px; margin: 1.7rem 0 0; color: var(--muted); font-size: clamp(1.12rem, 2vw, 1.38rem); line-height: 1.55; }
.byline { display: flex; flex-wrap: wrap; gap: .5rem 1.2rem; margin-top: 2rem; color: var(--muted); font-size: .84rem; }
.byline strong { color: var(--ink); }

.article-shell { width: min(calc(100% - 2rem), 1100px); display: grid; grid-template-columns: 220px minmax(0, 760px); gap: clamp(2rem, 7vw, 5rem); margin: 0 auto; padding: clamp(4rem, 8vw, 7rem) 0; align-items: start; }
.toc { position: sticky; top: 106px; }
.toc p { margin: 0 0 .75rem; color: var(--accent-dark); font-size: .74rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.toc ol { display: grid; gap: .58rem; margin: 0; padding: 0; list-style: none; }
.toc a { color: var(--muted); text-decoration: none; font-size: .78rem; line-height: 1.35; }
.toc a:hover, .toc a:focus-visible { color: var(--ink); }
.article-body { min-width: 0; }
.article-body > p:first-child { margin-top: 0; font-size: 1.2rem; color: var(--ink); }
.article-body h2 { scroll-margin-top: 110px; margin: 4rem 0 1.25rem; font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif; font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.08; letter-spacing: -.035em; font-weight: 500; }
.article-body h3 { scroll-margin-top: 110px; margin: 2.5rem 0 .75rem; font-size: 1.3rem; line-height: 1.3; letter-spacing: -.02em; }
.article-body p { margin: 0 0 1.25rem; color: #415359; }
.article-body ul, .article-body ol { margin: 0 0 1.5rem; padding-left: 1.35rem; color: #415359; }
.article-body li { margin-bottom: .62rem; padding-left: .25rem; }
.article-body strong { color: var(--ink); }
.article-body a { color: var(--accent-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.callout { margin: 2rem 0; padding: 1.4rem 1.5rem; border-left: 4px solid var(--accent-2); background: var(--panel); color: var(--ink); font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif; font-size: 1.25rem; line-height: 1.5; }
.formula { margin: 2rem 0; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--accent-soft); text-align: center; font-weight: 750; }
.numbered-list { counter-reset: item; list-style: none !important; padding: 0 !important; }
.numbered-list li { position: relative; margin-bottom: 1rem; padding: 0 0 1rem 3rem; border-bottom: 1px solid var(--line); }
.numbered-list li::before { counter-increment: item; content: counter(item, decimal-leading-zero); position: absolute; left: 0; top: .08rem; color: var(--accent-dark); font: 700 .72rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }

.evidence-loop { margin: 2.5rem 0; padding: clamp(1.25rem, 4vw, 2.5rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.evidence-loop figcaption { margin-bottom: 1.5rem; font-weight: 800; }
.loop-track { display: grid; justify-items: center; gap: .55rem; }
.loop-step { width: min(100%, 380px); padding: .75rem 1rem; border-radius: 4px; background: var(--ink); color: var(--bg); text-align: center; font-size: .88rem; }
.loop-arrow { color: var(--accent-dark); font-weight: 900; }
.loop-decision { width: min(100%, 520px); display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; }
.loop-result { padding: .7rem; border: 1px solid var(--line); border-radius: 4px; text-align: center; font-size: .82rem; font-weight: 750; }
.loop-result.pass { background: var(--accent-soft); }
.loop-result.fail { background: var(--warm-soft); }
.feedback-note { margin: 1rem 0 0; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; text-align: center; }

.case { margin: 1.5rem 0 2.5rem; padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.case .case-label { margin: 0 0 .5rem; color: var(--accent-dark); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.case h3 { margin-top: 0; }
.decision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .85rem; margin: 1.5rem 0; }
.decision-card { padding: 1.2rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.decision-card h3 { margin: 0 0 .6rem; font-size: 1rem; }
.decision-card p, .decision-card ul { margin-bottom: 0; font-size: .9rem; }
.executive-quote { margin: 3rem 0; padding: clamp(1.5rem, 5vw, 2.5rem); color: var(--bg); background: var(--accent-dark); border-radius: var(--radius); font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif; font-size: clamp(1.45rem, 3vw, 2.2rem); line-height: 1.35; }
.sources { margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.sources h2 { margin-top: 0; font-family: inherit; font-size: 1.2rem; font-weight: 800; letter-spacing: -.01em; }
.sources ol { font-size: .88rem; }
.article-footer-nav { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 4rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.article-footer-nav a { font-weight: 750; text-decoration: none; }

footer { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 2.5rem 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
footer a { text-decoration: none; }

@media (max-width: 900px) {
  .article-grid { grid-template-columns: 1fr; }
  .article-card.featured { grid-column: auto; }
  .article-shell { grid-template-columns: 1fr; }
  .toc { position: static; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
  .toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem 1.5rem; }
  .decision-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .shell, .article-shell { width: min(calc(100% - 1.25rem), var(--max)); }
  nav { min-height: 68px; }
  .monogram > span:last-child { display: none; }
  .nav-links { gap: .8rem; }
  .nav-links a:not(.nav-cta):not(.nav-perspectives) { display: none; }
  .page-hero h1 { font-size: clamp(3.2rem, 16vw, 5rem); }
  .article-hero h1 { font-size: clamp(2.75rem, 13vw, 4.4rem); }
  .article-card { min-height: 360px; }
  .toc ol { grid-template-columns: 1fr; }
  .loop-decision { grid-template-columns: 1fr; }
  footer, .article-footer-nav { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}