:root {
  --paper: #f4f0e6;
  --paper-raised: #fbf8f0;
  --ink: #17221d;
  --forest: #164b3c;
  --moss: #55623f;
  --brass: #b18745;
  --rule: #c9c1ae;
  --serif: "Newsreader", Georgia, serif;
  --sans: "IBM Plex Sans", Helvetica, sans-serif;
  --shell: min(1180px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 17px; line-height: 1.62; }
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--brass); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; left: 12px; top: 12px; padding: 10px 14px; background: var(--forest); color: white; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.shell { width: var(--shell); margin-inline: auto; }

.site-header { border-bottom: 1px solid var(--rule); }
.utility-bar { display: flex; justify-content: space-between; gap: 24px; padding: 10px max(24px, calc((100vw - 1180px) / 2)); background: var(--forest); color: #e9e6da; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; }
.utility-bar p { margin: 0; }
.masthead { width: var(--shell); min-height: 90px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.wordmark { display: flex; align-items: baseline; gap: 13px; text-decoration: none; font: 600 20px/1 var(--serif); letter-spacing: -.02em; }
.wordmark small { color: var(--moss); font: 600 9px/1 var(--sans); letter-spacing: .18em; }
nav { display: flex; gap: 26px; font-size: 12px; font-weight: 600; }
nav a { text-decoration: none; }
nav a:hover { color: var(--forest); }

.hero { display: grid; grid-template-columns: 160px 1fr; gap: 64px; padding-top: 88px; padding-bottom: 100px; }
.hero-index { display: flex; flex-direction: column; justify-content: space-between; min-height: 420px; padding: 17px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); color: var(--moss); font-size: 10px; letter-spacing: .13em; }
.hero-index strong { color: var(--forest); font: 500 74px/1 var(--serif); }
.hero-copy { max-width: 860px; }
.eyebrow { margin: 0 0 20px; color: var(--forest); font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; text-wrap: balance; }
h1 { margin: 0; font-size: clamp(4rem, 8.4vw, 8.5rem); line-height: .88; letter-spacing: -.065em; }
.dek { max-width: 720px; margin: 34px 0 0; font-size: 22px; line-height: 1.52; text-wrap: pretty; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 36px; }
.button { display: inline-flex; align-items: center; min-height: 48px; padding: 0 20px; background: var(--forest); color: white; text-decoration: none; font-size: 12px; font-weight: 600; }
.text-link { color: var(--forest); font-size: 12px; font-weight: 600; text-decoration-thickness: 1px; text-underline-offset: 5px; }

.section-marker { display: flex; justify-content: space-between; padding: 12px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); color: var(--moss); font-size: 10px; font-weight: 600; letter-spacing: .14em; }
.answer { padding-bottom: 96px; }
.answer-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; padding-top: 42px; }
.answer-grid h2 { margin: 0; font-size: clamp(2.6rem, 4.2vw, 5rem); line-height: .98; letter-spacing: -.045em; }
.answer-grid p { margin-top: 0; max-width: 660px; }
.answer-grid .lead { font-family: var(--serif); font-size: 26px; line-height: 1.42; }

.field-map { padding: 82px 0; border-top: 1px solid var(--rule); }
.section-heading { max-width: 760px; }
.section-heading h2 { margin: 0; font-size: clamp(2.7rem, 5vw, 5.4rem); line-height: .95; letter-spacing: -.05em; }
.section-heading > p:last-child { max-width: 650px; margin-top: 24px; }
.fact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin: 54px 0 0; background: var(--rule); border: 1px solid var(--rule); }
.fact-grid div { min-height: 225px; padding: 24px; background: var(--paper-raised); }
.fact-grid dt { color: var(--forest); font: 500 27px/1.1 var(--serif); }
.fact-grid dd { margin: 50px 0 0; color: #4d5c53; font-size: 14px; }

.library { padding: 90px 0 110px; }
.split-heading { display: grid; grid-template-columns: 1fr 1fr; max-width: none; gap: 80px; padding: 40px 0; }
.split-heading p { margin: 0; max-width: 520px; }
.entry-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.entry { min-height: 300px; padding: 30px; border: 1px solid var(--rule); background: var(--paper-raised); }
.entry.featured { background: var(--forest); color: white; border-color: var(--forest); }
.entry-code { margin: 0 0 62px; color: var(--moss); font-size: 10px; font-weight: 600; letter-spacing: .14em; }
.featured .entry-code { color: #c7d2c1; }
.entry h3 { margin: 0 0 12px; font-size: 38px; line-height: 1; }
.entry p:not(.entry-code) { max-width: 480px; color: #4d5c53; }
.featured p:not(.entry-code) { color: #dae2d8; }
.entry-status { display: inline-block; margin-top: 18px; color: var(--moss); font-size: 11px; font-weight: 600; }
.featured .entry-status { color: #c7d2c1; }

.model-flow { padding: 94px 0; background: var(--ink); color: white; }
.section-marker.inverted { border-color: rgba(255,255,255,.65) rgba(255,255,255,.2); color: #aebbad; }
.model-intro { display: grid; grid-template-columns: 1fr .8fr; gap: 80px; padding: 46px 0 56px; }
.model-intro h2 { margin: 0; font-size: clamp(3rem, 5vw, 5.8rem); line-height: .94; letter-spacing: -.05em; }
.model-intro p { margin: 0; color: #c4cec6; }
.flow-list { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; border: 1px solid rgba(255,255,255,.2); list-style: none; }
.flow-list li { min-height: 220px; padding: 24px; border-right: 1px solid rgba(255,255,255,.2); }
.flow-list li:last-child { border-right: 0; }
.flow-list span { display: block; margin-bottom: 64px; color: var(--brass); font-size: 10px; }
.flow-list strong { display: block; font: 500 24px/1.1 var(--serif); }
.flow-list small { display: block; margin-top: 9px; color: #aebbad; font-size: 13px; }

.related { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; padding-top: 88px; padding-bottom: 88px; }
.related h2 { margin: 0; max-width: 570px; font-size: 48px; line-height: .98; letter-spacing: -.045em; }
.related p { margin-top: 0; }
footer { padding: 56px 0; background: #e8e2d5; border-top: 1px solid var(--rule); }
.footer-grid { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 56px; }
.footer-title, .footer-label { margin: 0 0 12px; color: var(--forest); font-size: 11px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
footer p { margin: 0; color: #4f5d54; font-size: 13px; }

.toc { display: block; margin-bottom: 88px; padding: 28px 32px; border: 1px solid var(--rule); background: var(--paper-raised); }
.toc .eyebrow { margin-bottom: 18px; }
.toc ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin: 0; padding: 0; list-style: none; counter-reset: toc; }
.toc li { counter-increment: toc; border-top: 1px solid var(--rule); }
.toc a { display: grid; grid-template-columns: 28px 1fr; gap: 8px; padding: 12px 8px; color: var(--forest); font-size: 13px; font-weight: 600; text-decoration: none; }
.toc a::before { content: counter(toc, decimal-leading-zero); color: var(--moss); font-size: 9px; letter-spacing: .08em; }
.toc a:hover { background: rgba(85, 98, 63, .07); }

.comparison { padding-top: 10px; padding-bottom: 96px; }
.comparison-scroll { margin-top: 42px; overflow-x: auto; border: 1px solid var(--rule); }
.comparison table { width: 100%; min-width: 760px; border-collapse: collapse; background: var(--paper-raised); }
.comparison th, .comparison td { padding: 18px 20px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.comparison tr:last-child > * { border-bottom: 0; }
.comparison tr > *:last-child { border-right: 0; }
.comparison thead th { background: var(--forest); color: white; font-size: 11px; letter-spacing: .09em; text-transform: uppercase; }
.comparison tbody th { width: 20%; color: var(--forest); font: 600 13px/1.4 var(--sans); }
.comparison td { width: 40%; color: #4d5c53; font-size: 14px; }

.footer-directory { display: block; margin-top: 48px; padding-top: 38px; border-top: 1px solid var(--rule); }
.footer-directory h2 { margin: 0 0 28px; color: var(--forest); font-size: 32px; }
.footer-link-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 34px 28px; }
.footer-link-grid ul { margin: 0; padding: 0; list-style: none; }
.footer-link-grid li { margin: 8px 0; }
.footer-link-grid a { color: #4f5d54; font-size: 12px; line-height: 1.35; text-underline-offset: 3px; }

/* Corpus article system */
.entry { display: block; color: inherit; text-decoration: none; transition: transform 180ms ease, background 180ms ease; }
.entry:hover { transform: translateY(-3px); background: #fffdf7; }
.entry.featured:hover { background: #1b5847; }
.library-index { display: grid; grid-template-columns: repeat(2, 1fr); margin: 70px 0 0; padding: 0; border-top: 1px solid var(--ink); list-style: none; }
.library-index li { border-bottom: 1px solid var(--rule); }
.library-index li:nth-child(odd) { border-right: 1px solid var(--rule); }
.library-index a { display: grid; grid-template-columns: 86px 1fr auto; gap: 18px; align-items: baseline; padding: 18px 20px; text-decoration: none; }
.library-index a:hover strong { color: var(--forest); }
.library-index span, .library-index small { color: var(--moss); font-size: 10px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.library-index strong { font: 500 21px/1.2 var(--serif); }
.article-hero { padding-top: 72px; padding-bottom: 82px; }
.breadcrumbs { display: flex; gap: 10px; margin-bottom: 64px; color: var(--moss); font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.breadcrumbs a { text-underline-offset: 4px; }
.article-hero h1 { max-width: 1080px; font-size: clamp(4.2rem, 8vw, 8rem); }
.article-dek { max-width: 780px; margin: 32px 0 0; font: 400 25px/1.45 var(--serif); text-wrap: pretty; }
.entity-statement {
  max-width: 760px;
  margin-top: 1.4rem;
  padding: 1rem 1.15rem;
  border-left: 4px solid var(--moss);
  background: rgba(85, 98, 63, .08);
}
.entity-line { margin: 1rem 0; }
.article-answer { padding-bottom: 90px; }
.article-answer .answer-grid { align-items: start; }
.article-answer .lead { margin: 0; }
.article-section { padding-top: 88px; padding-bottom: 100px; }
.article-heading { margin-top: 44px; }
.article-facts { margin-top: 48px; }
.article-facts div { min-height: 280px; }
.article-process { padding: 92px 0 106px; background: var(--ink); color: white; }
.process-list { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,.22); border-left: 1px solid rgba(255,255,255,.22); list-style: none; }
.process-list li { display: grid; grid-template-columns: 42px 1fr; gap: 18px; min-height: 190px; padding: 26px; border-right: 1px solid rgba(255,255,255,.22); border-bottom: 1px solid rgba(255,255,255,.22); }
.process-list span { color: var(--brass); font-size: 10px; letter-spacing: .12em; }
.process-list strong { display: block; font: 500 27px/1.05 var(--serif); }
.process-list p { margin: 14px 0 0; color: #b9c5bd; font-size: 14px; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; }
.two-column h2 { margin: 0; font-size: clamp(2.7rem, 4.4vw, 4.8rem); line-height: .96; letter-spacing: -.045em; }
.risk-list, .question-list { margin: 38px 0 0; padding: 0; list-style: none; }
.risk-list li { padding: 18px 0 18px 28px; border-top: 1px solid var(--rule); position: relative; }
.risk-list li::before { content: "×"; position: absolute; left: 0; color: var(--brass); font: 500 20px/1 var(--serif); }
.question-list li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; padding: 18px 0; border-top: 1px solid var(--rule); font: 500 20px/1.35 var(--serif); }
.question-list span { color: var(--moss); font: 600 10px/1.8 var(--sans); letter-spacing: .1em; }
.provider-note { width: var(--shell); margin: 0 auto 90px; padding: 46px; background: var(--forest); color: white; }
.provider-note h2 { max-width: 720px; margin: 0; font-size: clamp(2.6rem, 4.6vw, 5rem); line-height: .97; letter-spacing: -.045em; }
.provider-note p:not(.eyebrow) { max-width: 760px; color: #d8e2dc; }
.provider-note .eyebrow, .provider-note .text-link { color: #e5d2ad; }
.sources { padding: 72px 0 90px; }
.sources-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; padding-top: 42px; }
.sources h2 { margin: 0; font-size: 42px; line-height: 1; }
.sources p { max-width: 480px; color: #566258; }
.sources ol { margin: 0; padding: 0; list-style: none; }
.sources li { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-top: 1px solid var(--rule); font-size: 14px; }
.sources li span { color: var(--moss); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.sources a { text-underline-offset: 4px; }
.more { padding: 80px 0 110px; border-top: 1px solid var(--rule); }
.more > h2 { margin: 0 0 42px; font-size: 54px; line-height: 1; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); }
.related-card { display: flex; min-height: 210px; padding: 22px; flex-direction: column; border-right: 1px solid var(--rule); text-decoration: none; }
.related-card:last-child { border-right: 0; }
.related-card span { color: var(--moss); font-size: 10px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.related-card strong { margin-top: 42px; font: 500 26px/1.05 var(--serif); }
.related-card small { margin-top: auto; color: var(--forest); font-size: 11px; font-weight: 600; }
.related-card:hover { background: var(--paper-raised); }

@media (max-width: 900px) {
  :root { --shell: min(100% - 32px, 720px); }
  .hero { grid-template-columns: 90px 1fr; gap: 34px; }
  .hero-index { min-height: 360px; }
  .hero-index strong { font-size: 48px; }
  .answer-grid, .model-intro, .related, .footer-grid, .two-column, .sources-grid { grid-template-columns: 1fr; gap: 36px; }
  .toc ol, .footer-link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fact-grid, .flow-list { grid-template-columns: 1fr 1fr; }
  .article-facts { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .related-card { min-height: 150px; border-right: 0; border-bottom: 1px solid var(--rule); }
  .related-card:last-child { border-bottom: 0; }
  .flow-list li:nth-child(2) { border-right: 0; }
  .flow-list li:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.2); }
}

@media (max-width: 620px) {
  .utility-bar p:last-child, .masthead nav { display: none; }
  .masthead { min-height: 72px; }
  .wordmark { font-size: 17px; }
  .hero { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 72px; }
  .hero-index { display: none; }
  h1 { font-size: clamp(3.6rem, 18vw, 5.4rem); }
  .dek { font-size: 19px; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .field-map, .library { padding: 70px 0; }
  .fact-grid, .entry-grid, .flow-list, .split-heading, .article-facts, .process-list, .library-index { grid-template-columns: 1fr; gap: 0; }
  .library-index li:nth-child(odd) { border-right: 0; }
  .library-index a { grid-template-columns: 64px 1fr; }
  .library-index small { display: none; }
  .article-hero { padding-top: 46px; padding-bottom: 62px; }
  .article-hero h1 { font-size: clamp(3.4rem, 17vw, 5.2rem); }
  .article-dek { font-size: 20px; }
  .breadcrumbs { margin-bottom: 42px; }
  .article-section { padding-top: 66px; padding-bottom: 74px; }
  .article-facts div { min-height: 190px; }
  .process-list li { min-height: 170px; }
  .provider-note { padding: 30px 24px; }
  .sources li { flex-direction: column; gap: 4px; }
  .fact-grid div { min-height: 190px; }
  .entry-grid { gap: 12px; }
  .flow-list li { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.2); }
  .flow-list li:last-child { border-bottom: 0; }
  .related h2 { font-size: 40px; }
  .toc { display: block; margin-bottom: 64px; padding: 22px 18px; }
  .toc ol, .footer-link-grid { grid-template-columns: 1fr; }
  .comparison-scroll { margin-inline: -16px; }
}

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