:root {
  --ink: #14201d;
  --muted: #5d6763;
  --forest: #163c34;
  --forest-dark: #0c2923;
  --sage: #dce7df;
  --paper: #f8f7f2;
  --white: #fff;
  --line: #d7ddd8;
  --accent: #9a7440;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "Courier New", monospace;
  --max: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .75rem 1rem; background: var(--white); }
.skip-link:focus { top: 1rem; }
.wrap { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.eyebrow, .meta-label {
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.muted { color: var(--muted); }

.site-header { border-bottom: 1px solid rgba(255,255,255,.15); background: var(--forest-dark); color: var(--white); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: flex; align-items: baseline; gap: .8rem; color: var(--white); text-decoration: none; }
.brand strong { font-family: var(--serif); font-size: 1.2rem; font-weight: 400; }
.brand span { color: #b9c9c2; font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.main-nav { display: flex; gap: 1.5rem; align-items: center; }
.main-nav a { color: #dce6e2; font-size: .86rem; text-decoration: none; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--white); text-decoration: underline; text-underline-offset: .35rem; }

.hero { padding: clamp(5rem, 10vw, 9rem) 0 5rem; background: var(--forest-dark); color: var(--white); }
.hero-grid { display: grid; gap: 3rem; }
.hero h1 { max-width: 900px; margin: 1rem 0 1.5rem; font-family: var(--serif); font-size: clamp(3.25rem, 8vw, 7.4rem); font-weight: 400; letter-spacing: -.045em; line-height: .96; }
.hero-lead { max-width: 720px; margin: 0; color: #c9d7d1; font-family: var(--serif); font-size: clamp(1.3rem, 2.5vw, 1.85rem); line-height: 1.45; }
.hero-language-note { max-width: 680px; margin: 1rem 0 0; color: #91aaa0; font-size: .92rem; }
.hero-actions, .paper-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.25rem; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: .78rem 1.05rem; border: 1px solid transparent; border-radius: 2px; font-size: .82rem; font-weight: 700; letter-spacing: .04em; text-decoration: none; }
.button-primary { background: var(--white); color: var(--forest-dark); }
.button-primary:hover { background: var(--sage); }
.button-secondary { border-color: rgba(255,255,255,.32); color: var(--white); }
.button-secondary:hover { border-color: var(--white); }
.button-dark { background: var(--forest); color: var(--white); }
.button-outline { border-color: var(--forest); color: var(--forest); }

.section { padding: clamp(4.5rem, 8vw, 7rem) 0; }
.section-white { background: var(--white); }
.section-dark { background: var(--forest); color: var(--white); }
.section-head { display: grid; gap: 1.5rem; margin-bottom: 3rem; }
.section-head h2, .page-title, .paper-title { margin: .55rem 0 0; font-family: var(--serif); font-weight: 400; letter-spacing: -.025em; line-height: 1.08; }
.section-head h2 { font-size: clamp(2.4rem, 5vw, 4.5rem); }
.section-head > p { max-width: 650px; margin: 0; color: var(--muted); }
.section-dark .section-head > p { color: #c7d6d0; }

.intro-grid, .research-grid, .integration-grid { display: grid; gap: 2rem; }
.intro-copy { max-width: 760px; font-family: var(--serif); font-size: clamp(1.2rem, 2vw, 1.5rem); line-height: 1.6; }
.project-name { display: block; max-width: 900px; margin: .65rem 0 1.5rem; color: var(--forest); font-family: var(--serif); font-size: clamp(2.15rem, 5vw, 4.35rem); font-weight: 400; letter-spacing: -.035em; line-height: 1.05; }
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; padding: 1px; background: var(--line); }
.principles div { padding: 1.5rem; background: var(--paper); }
.principles strong { display: block; font-family: var(--serif); font-size: 1.35rem; font-weight: 400; }

.research-grid { display: block; border-top: 1px solid var(--ink); }
.research-item { display: grid; grid-template-columns: 4rem minmax(220px, .75fr) 1fr; gap: 1.5rem; align-items: baseline; padding: 1.65rem 0; border-bottom: 1px solid var(--line); }
.research-item h3 { margin: 0; font-family: var(--serif); font-size: clamp(1.55rem, 3vw, 2.2rem); font-weight: 400; letter-spacing: -.02em; }
.research-item p { max-width: 580px; margin: 0; color: var(--muted); font-size: .94rem; }

.papers-list { border-top: 1px solid var(--line); }
.paper-row { display: grid; gap: 1.25rem; padding: 2rem 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.paper-row:hover h3 { color: var(--forest); text-decoration: underline; text-underline-offset: .25rem; }
.paper-number { color: var(--accent); font-family: var(--mono); font-size: .78rem; }
.paper-row h3 { margin: 0; font-family: var(--serif); font-size: clamp(1.45rem, 3vw, 2.15rem); font-weight: 400; line-height: 1.2; }
.paper-row p { margin: 0; color: var(--muted); }
.paper-tags { display: flex; flex-wrap: wrap; gap: .45rem; }
.tag { padding: .25rem .55rem; border: 1px solid var(--line); border-radius: 100px; color: var(--muted); font-family: var(--mono); font-size: .68rem; }

.roadmap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.roadmap article { min-height: 180px; padding: 1.5rem; border: 1px solid rgba(255,255,255,.18); }
.roadmap .future { opacity: .62; }
.roadmap h3 { margin: 1.8rem 0 .3rem; font-family: var(--serif); font-size: 1.55rem; font-weight: 400; }
.roadmap p { margin: 0; color: #c7d6d0; font-size: .9rem; }

.integration-grid { grid-template-columns: repeat(2, 1fr); }
.integration-card { display: block; padding: 2rem; border: 1px solid var(--line); background: var(--white); text-decoration: none; }
.integration-card strong { display: block; margin: .75rem 0 .2rem; font-family: var(--serif); font-size: 1.8rem; font-weight: 400; }
.integration-card span { color: var(--muted); }

.breadcrumbs { padding: 1rem 0; border-bottom: 1px solid var(--line); background: var(--white); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0; padding: 0; list-style: none; font-size: .76rem; color: var(--muted); }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: .5rem; color: #9ba39f; }
.breadcrumbs a { text-underline-offset: .2rem; }

.page-hero { padding: 5rem 0 4rem; background: var(--white); }
.page-title { max-width: 900px; font-size: clamp(3rem, 7vw, 6rem); }
.page-intro { max-width: 720px; margin: 1.5rem 0 0; color: var(--muted); font-family: var(--serif); font-size: 1.3rem; }

.paper-hero { padding: clamp(3.5rem, 7vw, 6rem) 0 4rem; background: var(--white); }
.paper-kicker { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.paper-title { max-width: 1000px; margin-top: 1.25rem; font-size: clamp(2.55rem, 6.5vw, 5.7rem); }
.paper-subtitle { max-width: 900px; margin: 1.2rem 0 0; color: var(--muted); font-family: var(--serif); font-size: clamp(1.15rem, 2vw, 1.45rem); }
.paper-byline { margin: 2rem 0 0; }
.paper-actions .button-outline { background: transparent; }

.meta-strip { border-block: 1px solid var(--line); background: #f1f3ef; }
.meta-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.meta-grid > div { padding: 1.35rem 1rem; border-right: 1px solid var(--line); }
.meta-grid > div:last-child { border-right: 0; }
.meta-grid strong, .meta-grid a { display: block; margin-top: .3rem; font-size: .86rem; overflow-wrap: anywhere; }

.paper-layout { display: grid; grid-template-columns: minmax(0, 1fr) 285px; gap: 5rem; align-items: start; }
.prose { max-width: 780px; }
.prose h2 { margin: 3.2rem 0 1rem; font-family: var(--serif); font-size: 2.25rem; font-weight: 400; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin: 0 0 1.1rem; }
.keywords { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; list-style: none; }
.keywords li { padding: .35rem .7rem; background: var(--sage); border-radius: 100px; font-size: .78rem; }
.sidebar { position: sticky; top: 1.5rem; padding: 1.4rem; border: 1px solid var(--line); background: var(--white); }
.sidebar h2 { margin: 0 0 1rem; font-family: var(--serif); font-size: 1.35rem; font-weight: 400; }
.sidebar a { display: block; padding: .55rem 0; border-bottom: 1px solid var(--line); font-size: .86rem; }
.sidebar a:last-child { border-bottom: 0; }

.citation { margin: 1rem 0; padding: 1.2rem; border-left: 3px solid var(--accent); background: #f1f3ef; }
.citation code, .bibtex { display: block; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere; font-family: var(--mono); font-size: .78rem; line-height: 1.7; }
.language-callout { margin-top: 3rem; padding: 1.5rem; border: 1px solid var(--line); background: var(--white); }

.site-footer { padding: 3rem 0; background: var(--forest-dark); color: #c7d6d0; }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; }
.footer-grid p { margin: .3rem 0 0; font-size: .82rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; font-size: .82rem; }

@media (min-width: 760px) {
  .hero-grid { grid-template-columns: 3fr 1fr; align-items: end; }
  .section-head { grid-template-columns: 1.2fr .8fr; align-items: end; }
  .paper-row { grid-template-columns: 90px minmax(0, 1fr) 260px; align-items: start; }
}
@media (max-width: 820px) {
  .main-nav a:not(:last-child):not(.lang-link) { display: none; }
  .brand span { display: none; }
  .roadmap, .meta-grid { grid-template-columns: 1fr; }
  .meta-grid > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .meta-grid > div:last-child { border-bottom: 0; }
  .paper-layout { grid-template-columns: 1fr; gap: 3rem; }
  .sidebar { position: static; }
}
@media (max-width: 560px) {
  .research-grid, .integration-grid, .principles { grid-template-columns: 1fr; }
  .research-item { grid-template-columns: 2.25rem 1fr; gap: .8rem; }
  .research-item p { grid-column: 2; }
  .footer-grid { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Bilingual paper matrix */
.pair-head,.paper-pair{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}.pair-head{margin:0 0 .75rem;color:var(--muted);font-weight:700}.paper-pair{margin-bottom:1.25rem}.paper-pair .paper-row{height:100%;box-sizing:border-box}.founder-block{padding:1.5rem;border:1px solid rgba(122,91,42,.35);background:linear-gradient(135deg,rgba(198,162,96,.14),rgba(255,255,255,.72));margin-bottom:2rem}.founder-label{margin:0 0 .4rem;text-transform:uppercase;letter-spacing:.12em;font-weight:800;font-size:.78rem}.founder-copy{max-width:850px;margin:0 0 1.25rem}.pair-section-title{margin:2.5rem 0 1rem}@media(max-width:760px){.pair-head{display:none}.paper-pair{grid-template-columns:1fr}.paper-pair .paper-row{min-height:0}}