:root {
  --ink: #12151b;
  --muted: #626a77;
  --paper: #f3f1eb;
  --paper-2: #e8e8e4;
  --white: #fbfaf7;
  --dark: #0d1016;
  --dark-2: #151a23;
  --line: rgba(18, 21, 27, 0.14);
  --line-strong: rgba(18, 21, 27, 0.24);
  --line-dark: rgba(255,255,255,.13);
  --blue: #5377e5;
  --blue-light: #87a2ff;
  --blue-ink: #3155bd;
  --blue-wash: #e7ecfb;
  --gold: #d4a017;
  --ivory: #f5f1e6;
  --radius: 24px;
  --shell: min(1180px, calc(100vw - 44px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 82px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
img { max-width: 100%; }
::selection { background: var(--blue); color: white; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 1000;
  background: var(--white);
  color: var(--ink);
  padding: 10px 14px;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
}
.skip-link:focus { left: 12px; }
.shell { width: var(--shell); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  color: var(--ivory);
  background: rgba(13,16,22,.95);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--line-dark);
  box-shadow: 0 8px 28px rgba(5,7,10,.16);
}
.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 720;
  letter-spacing: -.02em;
}
.brand-logo { width: 32px; height: 32px; display: block; flex: none; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
  position: relative;
  text-decoration: none;
  color: rgba(245,241,230,.68);
  font-size: 14px;
  font-weight: 620;
  transition: color .16s ease;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 1px;
  background: var(--blue-light);
  transition: right .16s ease;
}
.nav a:hover,
.nav a:focus-visible { color: var(--ivory); }
.nav a:hover::after,
.nav a:focus-visible::after { right: 0; }

.hero {
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 74px;
  align-items: center;
  padding-block: 76px 96px;
}
.eyebrow,
.section-kicker {
  margin: 0 0 20px;
  text-transform: uppercase;
  letter-spacing: .15em;
  font-size: 11px;
  font-weight: 800;
  color: var(--muted);
}
.eyebrow a {
  text-decoration-color: rgba(49,85,189,.45);
  text-underline-offset: 4px;
}
.eyebrow a:hover,
.eyebrow a:focus-visible { color: var(--blue-ink); }
.hero h1 {
  margin: 0;
  max-width: 870px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(62px, 7.6vw, 116px);
  line-height: .88;
  letter-spacing: -.06em;
  font-weight: 500;
}
.hero h1 span { color: var(--blue-ink); }
.lede {
  max-width: 780px;
  margin: 42px 0 0;
  font-size: clamp(20px, 2.05vw, 28px);
  line-height: 1.4;
  letter-spacing: -.025em;
}
.lede strong { font-weight: 760; }
.principle {
  margin-top: 46px;
  border-top: 1px solid var(--ink);
  padding-top: 17px;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 28px;
  max-width: 790px;
}
.principle-label {
  text-transform: uppercase;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--muted);
}
.principle p { margin: 0; font-size: 18px; font-weight: 680; line-height: 1.4; }

.hero-model {
  width: 100%;
  max-width: 500px;
  justify-self: end;
  background: var(--dark);
  color: var(--ivory);
  border-radius: 28px;
  padding: 34px;
  box-shadow: 0 28px 80px rgba(13,16,22,.18);
  border: 1px solid rgba(255,255,255,.06);
}
.model-block { text-align: center; }
.model-label {
  display: block;
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: 9px;
  font-weight: 800;
  color: rgba(245,241,230,.48);
}
.artifact-box {
  border: 1px solid rgba(245,241,230,.22);
  background: rgba(255,255,255,.035);
  padding: 20px;
  border-radius: 14px;
  font-family: Georgia, serif;
  font-size: 27px;
}
.model-arrow { padding: 10px 0 7px; color: rgba(245,241,230,.38); }
.model-result { color: rgba(245,241,230,.56); font-size: 14px; font-weight: 700; }
.model-result.strong { color: var(--blue-light); }
.model-divider { height: 1px; background: rgba(255,255,255,.11); margin: 30px 0; }
.trace-stack { display: grid; grid-template-columns: repeat(2,1fr); gap: 8px; }
.trace-stack span {
  border: 1px solid rgba(135,162,255,.24);
  background: rgba(83,119,229,.08);
  color: rgba(245,241,230,.82);
  border-radius: 999px;
  padding: 9px 10px;
  font-size: 11px;
  font-weight: 680;
}
.trace-stack span:last-child { grid-column: 1 / -1; width: 52%; justify-self: center; }

.section { padding-block: 110px; }
.section h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(42px, 5.4vw, 75px);
  line-height: .99;
  letter-spacing: -.045em;
  font-weight: 500;
}
.dark-section {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  color: var(--ivory);
}
.dark-section::after {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  right: -245px;
  bottom: -275px;
  border: 1px solid rgba(83,119,229,.22);
  border-radius: 50%;
  box-shadow: 0 0 0 90px rgba(83,119,229,.03), 0 0 0 180px rgba(83,119,229,.02);
  pointer-events: none;
}
.dark-section .section-kicker { color: rgba(245,241,230,.50); }
.dark-section strong { color: var(--blue-light); }
.two-col {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 90px;
  align-items: start;
}
.prose { font-size: 20px; line-height: 1.65; }
.large-prose { font-size: clamp(21px, 2.1vw, 29px); line-height: 1.5; }
.prose p:first-child { margin-top: 0; }
.prose p:last-child { margin-bottom: 0; }

.section-head { max-width: 900px; margin-bottom: 58px; }
.section-head > p:last-child {
  margin: 24px 0 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 20px;
}
.compact-head { max-width: 930px; }
.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.principle-card {
  min-height: 290px;
  padding: 30px 34px 36px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.card-number {
  font-size: 11px;
  font-weight: 800;
  color: var(--blue-ink);
  letter-spacing: .12em;
}
.principle-card h3 {
  margin: 40px 0 14px;
  font-family: Georgia, serif;
  font-size: 34px;
  line-height: 1.05;
  letter-spacing: -.03em;
  font-weight: 500;
}
.principle-card p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.67; }

.evidence-section {
  background: var(--blue-wash);
  border-block: 1px solid rgba(49,85,189,.14);
}
.evidence-grid {
  display: grid;
  grid-template-columns: .86fr 1.14fr;
  gap: 92px;
  align-items: start;
}
.evidence-copy p:not(.section-kicker) { color: #4f5868; font-size: 18px; line-height: 1.72; max-width: 560px; }
.evidence-copy h2 { margin-bottom: 28px; }
.evidence-list { border-top: 1px solid rgba(18,21,27,.18); }
.evidence-list > div {
  display: grid;
  grid-template-columns: 44px 230px 1fr;
  gap: 18px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid rgba(18,21,27,.14);
}
.evidence-list span { color: var(--blue-ink); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.evidence-list strong { font-size: 16px; }
.evidence-list p { margin: 0; color: #5a6372; font-size: 14px; line-height: 1.55; }

.workflow {
  margin-top: 58px;
  display: grid;
  grid-template-columns: repeat(11, auto);
  align-items: center;
  gap: 10px;
  padding: 26px;
  background: var(--dark);
  color: var(--ivory);
  border-radius: 22px;
  overflow-x: auto;
}
.workflow-step { min-width: 120px; }
.workflow-step span { display: block; color: var(--blue-light); font-size: 9px; font-weight: 800; letter-spacing: .12em; margin-bottom: 6px; }
.workflow-step strong { display: block; font-family: Georgia, serif; font-size: 22px; font-weight: 500; }
.workflow-step small { color: rgba(245,241,230,.48); font-size: 11px; }
.workflow-arrow { color: rgba(245,241,230,.28); font-size: 18px; }
.practice-grid {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 0;
  margin-top: 38px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.practice-grid article { padding: 30px 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.practice-grid h3 { margin: 0 0 10px; font-family: Georgia, serif; font-size: 27px; font-weight: 500; letter-spacing: -.02em; }
.practice-grid p { margin: 0; color: var(--muted); line-height: 1.65; }

.contrast-section { background: var(--paper-2); border-block: 1px solid var(--line); }
.contrast-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 90px; align-items: start; }
.contrast-table { border-top: 1px solid var(--line-strong); }
.contrast-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.contrast-row span { color: var(--muted); }
.contrast-row strong { color: var(--blue-ink); }

.responsibility-section { padding-top: 34px; }
.responsibility-callout {
  position: relative;
  overflow: hidden;
  background: var(--dark-2);
  color: var(--ivory);
  border-radius: var(--radius);
  padding: clamp(48px, 7vw, 86px);
  box-shadow: 0 30px 90px rgba(13,16,22,.12);
}
.responsibility-callout::after {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -130px;
  top: -190px;
  border: 1px solid rgba(83,119,229,.24);
  border-radius: 50%;
  box-shadow: 0 0 0 65px rgba(83,119,229,.028);
}
.responsibility-callout > * { position: relative; z-index: 1; }
.responsibility-callout .section-kicker { color: rgba(245,241,230,.48); }
.responsibility-callout h2 { max-width: 880px; }
.responsibility-callout > p:last-child { max-width: 900px; margin: 28px 0 0; color: rgba(245,241,230,.72); font-size: 20px; line-height: 1.67; }

.agency-section { padding-top: 38px; }
.agency-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 70px;
  align-items: center;
  background: #efe9dd;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(42px,6vw,72px);
}
.agency-mark-wrap {
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--dark);
  display: grid;
  place-items: center;
  box-shadow: 0 22px 56px rgba(13,16,22,.16);
}
.agency-mark-wrap img { width: 112px; height: 112px; }
.agency-card h2 { font-size: clamp(42px,5vw,68px); }
.agency-card > div:last-child > p:not(.section-kicker) { max-width: 780px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.text-link {
  display: inline-flex;
  gap: 8px;
  margin-top: 18px;
  color: var(--ink);
  font-weight: 760;
  text-decoration-color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}
.text-link:hover,
.text-link:focus-visible { color: var(--blue-ink); }

.provenance { padding-top: 92px; }
.provenance-rule { height: 1px; background: var(--line); margin-bottom: 38px; }
.provenance-grid { display: grid; grid-template-columns: .55fr 1.45fr; gap: 80px; }
.provenance-grid h2 { font-size: clamp(42px,4.5vw,64px); }
.provenance-grid p:last-child { max-width: 820px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.provenance-grid a { text-decoration-color: rgba(49,85,189,.45); text-underline-offset: 4px; text-decoration-thickness: 1px; }
.provenance-grid a:hover,
.provenance-grid a:focus-visible { color: var(--blue-ink); }

.site-footer { background: var(--dark); color: var(--ivory); padding: 54px 0 42px; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 42px; align-items: start; }
.footer-identity { display: flex; align-items: center; gap: 15px; }
.footer-logo { width: 39px; height: 39px; flex: none; }
.footer-brand { font-family: Georgia, serif; font-size: 29px; letter-spacing: -.03em; }
.footer-grid p { color: rgba(245,241,230,.50); margin: 5px 0 0; }
.footer-links { display: flex; gap: 24px; padding-top: 7px; }
.footer-links a { color: rgba(245,241,230,.74); text-decoration: none; font-size: 14px; font-weight: 650; }
.footer-links a:hover,
.footer-links a:focus-visible { color: var(--blue-light); }
.copyright { grid-column: 1 / -1; font-size: 12px; padding-top: 34px; border-top: 1px solid var(--line-dark); }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }

@media (max-width: 1040px) {
  .nav { display: none; }
  .hero { grid-template-columns: 1fr; gap: 42px; min-height: auto; padding-top: 82px; }
  .hero-model { justify-self: start; max-width: 660px; }
  .two-col,
  .evidence-grid,
  .contrast-grid,
  .provenance-grid { grid-template-columns: 1fr; gap: 44px; }
  .agency-card { grid-template-columns: 160px 1fr; gap: 46px; }
  .evidence-list > div { grid-template-columns: 40px 210px 1fr; }
}

@media (max-width: 720px) {
  :root { --shell: min(100% - 30px, 1180px); }
  html { scroll-padding-top: 68px; }
  .nav-wrap { min-height: 66px; }
  .brand-logo { width: 29px; height: 29px; }
  .brand span { font-size: 15px; }
  .hero { padding-block: 62px 74px; }
  .hero h1 { font-size: clamp(54px, 17vw, 82px); }
  .lede { margin-top: 30px; font-size: 20px; }
  .principle { grid-template-columns: 1fr; gap: 8px; margin-top: 34px; }
  .hero-model { padding: 24px; border-radius: 20px; }
  .section { padding-block: 78px; }
  .section h2 { font-size: 44px; }
  .principle-grid,
  .practice-grid { grid-template-columns: 1fr; }
  .principle-card { min-height: 0; padding: 26px 0 30px; border-left: none; border-right: none; }
  .principle-grid { border-left: none; }
  .principle-card h3 { margin-top: 24px; }
  .evidence-list > div { grid-template-columns: 32px 1fr; gap: 8px 12px; }
  .evidence-list p { grid-column: 2; }
  .workflow { padding: 20px; }
  .practice-grid { border-left: none; }
  .practice-grid article { padding: 25px 0; border-right: none; }
  .contrast-row { grid-template-columns: 1fr; gap: 5px; }
  .agency-card { grid-template-columns: 1fr; }
  .agency-mark-wrap { width: 140px; }
  .agency-mark-wrap img { width: 78px; height: 78px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: 12px; padding-top: 0; }
  .copyright { grid-column: 1; }
}

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