:root {
  --ink: #0a1a27;
  --muted: #526574;
  --paper: #f7f5ef;
  --white: #ffffff;
  --navy: #071d31;
  --navy-2: #0b2e4a;
  --blue: #1599d4;
  --cyan: #58d8f5;
  --line: #d9e1e5;
  --soft: #edf4f6;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max: 1180px;
}

* { 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: 1.65;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  padding: .75rem 1rem;
  background: var(--white);
  color: var(--navy);
}
.skip-link:focus { left: 1rem; top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(247,245,239,.94);
  border-bottom: 1px solid rgba(10,26,39,.1);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { position: relative; display: inline-grid; place-items: center; width: 42px; height: 42px; }
.brand-mark span { position: absolute; width: 11px; height: 11px; border-radius: 50%; background: var(--navy); }
.brand-mark span:nth-child(1) { top: 2px; }
.brand-mark span:nth-child(2) { bottom: 4px; left: 4px; background: var(--blue); }
.brand-mark span:nth-child(3) { bottom: 4px; right: 4px; background: var(--cyan); }
.brand strong { display: block; font-family: var(--serif); font-size: 1.25rem; line-height: 1; letter-spacing: .04em; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a { text-decoration: none; font-size: .85rem; font-weight: 650; }
.site-nav a:not(.nav-cta):hover { color: var(--blue); }
.nav-cta { padding: 10px 16px; color: var(--white); background: var(--navy); border-radius: 999px; }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; }
.menu-toggle span:not(.sr-only) { display: block; height: 2px; margin: 5px 0; background: var(--navy); }

.section, .hero, .question-strip, .site-footer {
  padding-left: max(24px, calc((100vw - var(--max)) / 2));
  padding-right: max(24px, calc((100vw - var(--max)) / 2));
}
.section { padding-top: 112px; padding-bottom: 112px; }
.section-dark { color: var(--white); background: var(--navy); }
.section-tint { background: var(--soft); }
.eyebrow { margin: 0 0 16px; color: var(--blue); font-size: .78rem; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.section-dark .eyebrow { color: var(--cyan); }
h1, h2, h3 { margin-top: 0; font-family: var(--serif); line-height: 1.08; }
h1 { max-width: 790px; margin-bottom: 30px; font-size: clamp(3.2rem, 7.6vw, 6.8rem); font-weight: 500; letter-spacing: -.045em; }
h2 { margin-bottom: 22px; font-size: clamp(2.3rem, 4vw, 4rem); font-weight: 500; letter-spacing: -.035em; }
h3 { font-size: 1.55rem; font-weight: 600; }
.section-heading { max-width: 790px; margin-bottom: 54px; }
.section-heading > p:last-child { max-width: 710px; color: var(--muted); font-size: 1.08rem; }
.split-heading { max-width: none; display: grid; grid-template-columns: 1.25fr .75fr; gap: 80px; align-items: end; }
.split-heading > p:last-child { margin-bottom: 20px; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 70px;
  min-height: calc(100vh - 78px);
  align-items: center;
  overflow: hidden;
  padding-top: 90px;
  padding-bottom: 90px;
}
.hero-content { position: relative; z-index: 2; }
.hero-question { max-width: 720px; margin: 0 0 22px; color: var(--white); font-family: var(--serif); font-size: clamp(1.35rem, 2.4vw, 2rem); line-height: 1.35; }
.hero-intro { max-width: 680px; color: #b9cbd8; font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 49px; padding: 12px 20px; border: 1px solid transparent; border-radius: 999px; text-decoration: none; font-size: .88rem; font-weight: 760; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--navy); background: var(--cyan); }
.button-quiet { color: var(--white); border-color: rgba(255,255,255,.32); }
.button-outline { border-color: var(--navy); }
.version-line { margin-top: 22px; color: #829bab; font-size: .77rem; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(2px); opacity: .35; }
.hero-glow-one { width: 520px; height: 520px; right: -190px; top: -170px; background: radial-gradient(circle, rgba(88,216,245,.28), transparent 65%); }
.hero-glow-two { width: 420px; height: 420px; left: 30%; bottom: -280px; background: radial-gradient(circle, rgba(21,153,212,.2), transparent 68%); }
.hero-visual { position: relative; width: min(390px, 34vw); aspect-ratio: 1; margin: auto; }
.orbit { position: absolute; inset: 12%; border: 1px solid rgba(88,216,245,.4); border-radius: 50%; }
.orbit-small { inset: 31%; border-color: rgba(255,255,255,.18); }
.triad-node { position: absolute; display: grid; place-items: center; width: 92px; height: 92px; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; background: rgba(7,29,49,.88); box-shadow: 0 0 50px rgba(21,153,212,.12); }
.triad-node strong { font-family: var(--serif); font-size: 2rem; line-height: 1; }
.triad-node span { color: #a7becd; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; }
.node-k { left: 50%; top: 0; transform: translateX(-50%); }
.node-n { left: 2%; bottom: 5%; }
.node-c { right: 2%; bottom: 5%; }
.node-n strong { color: var(--blue); }
.node-c strong { color: var(--cyan); }
.triad-centre { position: absolute; inset: 38%; display: grid; place-items: center; border-radius: 50%; background: var(--white); color: var(--navy); font-size: .6rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }

.question-strip { display: grid; grid-template-columns: repeat(3, 1fr); background: #0d2940; color: #a8bdca; }
.question-strip p { margin: 0; padding: 30px 34px; border-right: 1px solid rgba(255,255,255,.12); font-size: .86rem; }
.question-strip p:last-child { border-right: 0; }
.question-strip strong { display: block; color: var(--white); font-family: var(--serif); font-size: 1.2rem; font-weight: 500; }

.triad-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.concept-card { position: relative; min-height: 390px; padding: 34px; overflow: hidden; background: var(--white); border: 1px solid var(--line); }
.concept-letter { position: absolute; right: -9px; top: -35px; color: rgba(7,29,49,.055); font-family: var(--serif); font-size: 12rem; line-height: 1; }
.concept-type { color: var(--blue); font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.concept-card h3 { margin-top: 58px; font-size: 2rem; }
.concept-card > p:not(.concept-type):not(.concept-question) { color: var(--muted); }
.concept-question { position: absolute; left: 34px; bottom: 26px; margin: 0; font-family: var(--serif); font-size: 1.2rem; font-style: italic; }
.concept-n { margin-top: 24px; }
.concept-c { margin-top: 48px; }
.principle-note { display: grid; grid-template-columns: 180px 1fr; gap: 30px; max-width: 880px; margin: 60px 0 0 auto; padding: 28px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.note-label { color: var(--blue); font-size: .76rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.principle-note p { margin: 0; font-family: var(--serif); font-size: 1.24rem; line-height: 1.5; }

.claims-grid { display: grid; grid-template-columns: 1fr 150px 1fr; align-items: stretch; }
.claim-card { min-height: 390px; padding: 40px; border: 1px solid #c8d7dd; background: rgba(255,255,255,.68); }
.claim-a { border-top: 5px solid var(--blue); }
.claim-b { border-top: 5px solid var(--navy); }
.claim-topline { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 70px; font-size: .72rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.claim-topline small { color: var(--muted); font: inherit; text-align: right; }
.claim-card p { color: var(--muted); }
.not-entail { display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; color: var(--muted); }
.not-entail span { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--navy); color: var(--white); font-family: var(--serif); font-size: 1.25rem; }
.not-entail span:last-child { background: var(--blue); }
.not-entail b { font-size: .66rem; letter-spacing: .07em; text-transform: uppercase; }

.bridge-section { display: grid; grid-template-columns: 1fr 1fr; gap: 70px 90px; }
.bridge-copy p:not(.eyebrow) { color: var(--muted); }
blockquote { margin: 38px 0 0; padding: 8px 0 8px 25px; border-left: 3px solid var(--blue); color: var(--navy); font-family: var(--serif); font-size: 1.35rem; line-height: 1.45; }
.bridge-diagram { display: flex; flex-direction: column; justify-content: center; }
.diagram-box { padding: 24px 26px; border: 1px solid var(--line); background: var(--white); }
.diagram-box span { display: block; margin-bottom: 5px; color: var(--blue); font-size: .7rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.diagram-box strong { font-family: var(--serif); font-size: 1.15rem; }
.diagram-bridge { border-color: var(--blue); background: var(--navy); color: var(--white); }
.diagram-arrow { position: relative; height: 52px; margin-left: 38px; border-left: 1px solid var(--blue); }
.diagram-arrow::after { content: ""; position: absolute; bottom: -1px; left: -4px; width: 7px; height: 7px; border-right: 1px solid var(--blue); border-bottom: 1px solid var(--blue); transform: rotate(45deg); }
.diagram-arrow span { position: absolute; left: 12px; top: 13px; color: var(--muted); font-size: .66rem; text-transform: uppercase; letter-spacing: .1em; }
.research-columns { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 45px; margin-top: 30px; padding-top: 45px; border-top: 1px solid var(--line); }
.research-columns .number { color: var(--blue); font-family: var(--serif); font-size: 1.5rem; }
.research-columns h3 { margin: 17px 0 14px; }
.research-columns p { color: var(--muted); }

.publications .section-heading > p:last-child { color: #a9bdca; }
.featured-paper { display: grid; grid-template-columns: 1fr auto; gap: 60px; align-items: end; padding: 40px; border: 1px solid rgba(88,216,245,.34); background: linear-gradient(135deg, rgba(21,153,212,.12), rgba(255,255,255,.025)); }
.paper-status { display: inline-block; margin-bottom: 20px; color: var(--cyan); font-size: .7rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.featured-paper h3 { max-width: 760px; font-size: clamp(1.7rem, 3vw, 2.5rem); }
.featured-paper p { max-width: 760px; color: #aec0cb; }
.paper-link { white-space: nowrap; color: var(--cyan); font-weight: 750; text-decoration: none; }
.paper-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 24px; border-top: 1px solid rgba(255,255,255,.15); border-left: 1px solid rgba(255,255,255,.15); }
.paper-card { min-height: 285px; padding: 30px; border-right: 1px solid rgba(255,255,255,.15); border-bottom: 1px solid rgba(255,255,255,.15); }
.paper-number { color: var(--cyan); font-size: .72rem; letter-spacing: .13em; }
.paper-card h3 { margin: 38px 0 16px; font-size: 1.35rem; }
.paper-card p { color: #a9bdca; font-size: .91rem; }
.paper-card a { color: var(--cyan); font-size: .83rem; font-weight: 800; text-decoration: none; }
.review-note { max-width: 920px; margin: 28px 0 0; color: #7f9aab; font-size: .78rem; }

.problems-list { border-top: 1px solid var(--line); }
.problems-list article { display: grid; grid-template-columns: 90px 1fr; padding: 32px 0; border-bottom: 1px solid var(--line); }
.problems-list article > span { color: var(--blue); font-family: var(--serif); font-size: 1.4rem; }
.problems-list h3 { margin-bottom: 8px; }
.problems-list p { max-width: 760px; margin: 0; color: var(--muted); }

.invitation-section { display: grid; grid-template-columns: 1.3fr .7fr; gap: 80px; align-items: end; background: #dfeef1; }
.invitation-section > div:first-child > p:last-child { max-width: 770px; color: var(--muted); }
.invitation-links { display: flex; flex-direction: column; gap: 12px; }
.author-section { display: grid; grid-template-columns: 180px 1fr; gap: 55px; align-items: center; }
.author-monogram { display: grid; place-items: center; width: 180px; height: 180px; border-radius: 50%; background: var(--navy); color: var(--cyan); font-family: var(--serif); font-size: 3.3rem; letter-spacing: -.04em; }
.author-section p:not(.eyebrow) { max-width: 690px; color: var(--muted); }
.author-links { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 28px; }
.author-links a { color: var(--navy); font-size: .82rem; font-weight: 800; text-decoration: none; }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 38px; align-items: center; padding-top: 34px; padding-bottom: 34px; border-top: 1px solid var(--line); color: var(--muted); font-size: .74rem; }
.footer-brand { display: flex; align-items: baseline; gap: 12px; }
.footer-brand strong { color: var(--navy); font-family: var(--serif); font-size: 1.25rem; }

@media (max-width: 960px) {
  .site-nav { position: absolute; inset: 78px 0 auto; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 16px 24px 24px; background: var(--paper); border-bottom: 1px solid var(--line); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 13px 0; }
  .nav-cta { margin-top: 8px; text-align: center; }
  .menu-toggle { display: block; }
  .hero { grid-template-columns: 1fr; padding-top: 90px; }
  .hero-visual { width: min(370px, 78vw); }
  .split-heading, .bridge-section, .invitation-section { grid-template-columns: 1fr; gap: 30px; }
  .triad-grid { grid-template-columns: 1fr; }
  .concept-card, .concept-n, .concept-c { min-height: 310px; margin-top: 0; }
  .claims-grid { grid-template-columns: 1fr; }
  .not-entail { flex-direction: row; padding: 25px; }
  .research-columns { grid-template-columns: 1fr; gap: 20px; }
  .paper-grid { grid-template-columns: repeat(2, 1fr); }
  .site-footer { grid-template-columns: 1fr; gap: 6px; }
  .site-footer p { margin: 0; }
}

@media (max-width: 650px) {
  body { font-size: 16px; }
  .section { padding-top: 78px; padding-bottom: 78px; }
  .brand small { display: none; }
  h1 { font-size: clamp(3rem, 15vw, 4.5rem); }
  .question-strip { grid-template-columns: 1fr; padding-top: 12px; padding-bottom: 12px; }
  .question-strip p { padding: 18px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .question-strip p:last-child { border-bottom: 0; }
  .principle-note { grid-template-columns: 1fr; gap: 12px; }
  .claim-card { padding: 28px; }
  .claim-topline { margin-bottom: 45px; }
  .featured-paper { grid-template-columns: 1fr; gap: 20px; padding: 28px; }
  .paper-grid { grid-template-columns: 1fr; }
  .problems-list article { grid-template-columns: 55px 1fr; }
  .author-section { grid-template-columns: 1fr; }
  .author-monogram { width: 110px; height: 110px; font-size: 2.2rem; }
}

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