:root {
  --paper: #f4f1e8;
  --paper-deep: #e9e4d8;
  --ink: #171813;
  --muted: #66685f;
  --rule: #c9c4b8;
  --accent: #7b2f2f;
  --accent-dark: #572020;
  --white: #fffdf8;
  --shadow: 0 22px 60px rgba(26, 26, 20, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
button, input { font: inherit; }
img { max-width: 100%; display: block; }

.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 110px 0; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  background: var(--ink);
  color: white;
  padding: 10px 14px;
  z-index: 100;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 241, 232, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(201, 196, 184, 0.75);
}
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; gap: 14px; align-items: center; text-decoration: none; }
.seal {
  width: 46px;
  height: 46px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font: 600 12px/1 "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
}
.brand-copy { display: flex; flex-direction: column; line-height: 1.18; }
.brand-copy strong { font-size: 17px; }
.brand-copy span { color: var(--muted); font: 400 11px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.primary-nav { display: flex; gap: 28px; align-items: center; }
.primary-nav a { text-decoration: none; font: 500 12px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }
.primary-nav a:hover { color: var(--accent); }
.menu-button { display: none; border: 1px solid var(--ink); background: transparent; padding: 9px 12px; }

.hero { padding: 118px 0 92px; border-bottom: 1px solid var(--rule); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(320px, 0.7fr); gap: 72px; align-items: end; }
.eyebrow { margin: 0 0 16px; color: var(--accent); font: 600 12px/1.2 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.11em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 850px; margin-bottom: 28px; font-size: clamp(54px, 7vw, 96px); line-height: 0.98; letter-spacing: -0.045em; font-weight: 600; }
.lede { max-width: 760px; font-size: clamp(21px, 2.1vw, 29px); line-height: 1.35; color: #33352e; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 18px; border: 1px solid var(--ink); text-decoration: none; font: 600 12px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; cursor: pointer; }
.button.primary { background: var(--ink); color: var(--white); }
.button.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.button.secondary { background: transparent; }
.button.secondary:hover { background: var(--paper-deep); }

.briefing-card { background: var(--white); border: 1px solid var(--rule); padding: 26px; box-shadow: var(--shadow); }
.briefing-topline { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--rule); color: var(--muted); font: 500 10px/1.2 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }
.briefing-card h2 { margin: 24px 0 18px; font-size: 31px; line-height: 1.08; }
.briefing-card p { color: #4c4e47; }
.briefing-card a { font: 600 12px/1 "IBM Plex Mono", monospace; text-transform: uppercase; text-decoration: none; color: var(--accent); }

.ticker { border-bottom: 1px solid var(--rule); background: var(--paper-deep); }
.ticker-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.ticker-grid div { padding: 28px 24px; border-right: 1px solid var(--rule); }
.ticker-grid div:first-child { padding-left: 0; }
.ticker-grid div:last-child { border-right: 0; }
.ticker strong { display: block; font-size: 34px; line-height: 1; }
.ticker span { color: var(--muted); font: 500 10px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }

.section-heading { max-width: 760px; margin-bottom: 44px; }
.section-heading h2 { margin-bottom: 18px; font-size: clamp(42px, 5vw, 70px); line-height: 1.02; letter-spacing: -0.035em; }
.section-heading > p:last-child { font-size: 21px; color: var(--muted); }
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.research-card { min-height: 270px; padding: 34px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: rgba(255,255,255,0.18); }
.card-number { font: 500 11px/1 "IBM Plex Mono", monospace; color: var(--accent); }
.research-card h3 { margin: 50px 0 16px; font-size: 31px; line-height: 1.1; }
.research-card p { max-width: 520px; color: var(--muted); font-size: 18px; }

.method-section { background: var(--ink); color: var(--white); }
.method-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 90px; align-items: start; }
.method-section .section-heading > p:last-child { color: #b9baaf; }
.sticky-heading { position: sticky; top: 120px; }
.method-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid #44453f; }
.method-list li { display: grid; grid-template-columns: 70px 1fr; gap: 18px; padding: 34px 0; border-bottom: 1px solid #44453f; }
.method-list li > span { font: 600 12px/1 "IBM Plex Mono", monospace; color: #d28b7e; }
.method-list h3 { margin-bottom: 10px; font-size: 30px; }
.method-list p { margin: 0; color: #b9baaf; font-size: 18px; }

.row-heading { display: flex; max-width: none; justify-content: space-between; gap: 30px; align-items: end; }
.filter-button { border: 0; border-bottom: 1px solid var(--ink); background: transparent; padding: 0 0 5px; cursor: pointer; font: 500 11px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.publication-list { border-top: 1px solid var(--ink); }
.publication { display: grid; grid-template-columns: 230px 1fr 1.1fr 145px; gap: 30px; align-items: start; padding: 34px 0; border-bottom: 1px solid var(--rule); }
.publication-meta { display: grid; gap: 4px; color: var(--muted); font: 500 10px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.publication h3 { margin: 0; font-size: 28px; line-height: 1.15; }
.publication p { margin: 0; color: var(--muted); }
.publication > a { justify-self: end; text-decoration: none; color: var(--accent); font: 600 11px/1.3 "IBM Plex Mono", monospace; text-transform: uppercase; }
.featured-publication { background: var(--white); margin: 0 -22px; padding-left: 22px; padding-right: 22px; }

.quote-section { padding: 110px 0; background: var(--accent); color: white; }
blockquote { max-width: 1050px; margin: 0 0 30px; font-size: clamp(38px, 5vw, 70px); line-height: 1.04; letter-spacing: -0.035em; }
cite { font: 500 11px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; font-style: normal; }

.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 100px; }
.about-copy { font-size: 22px; }
.about-copy p { max-width: 700px; }
.notice { margin-top: 40px; padding: 24px; border: 1px solid var(--rule); background: var(--white); }
.notice strong { font: 600 11px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }
.notice p { margin: 12px 0 0; font-size: 17px; color: var(--muted); }

.newsletter-section { padding: 72px 0; background: var(--paper-deep); border-top: 1px solid var(--rule); }
.newsletter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.newsletter-grid h2 { margin-bottom: 0; font-size: 45px; line-height: 1.04; }
.newsletter-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.newsletter-form input { min-width: 0; height: 48px; border: 1px solid var(--ink); background: var(--white); padding: 0 14px; }
.form-status { grid-column: 1 / -1; min-height: 20px; margin: 0; color: var(--accent); font: 500 11px/1.3 "IBM Plex Mono", monospace; }

.site-footer { padding: 60px 0; background: #10110e; color: #efeee8; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 0.7fr 0.7fr 1fr; gap: 44px; }
.footer-grid strong { font-size: 20px; }
.footer-grid p { max-width: 360px; color: #a7a89f; }
.footer-grid > div { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.footer-grid span { color: #86877f; font: 500 10px/1.3 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.footer-grid a { text-decoration: none; color: #d6d5ce; }
.footer-grid a:hover { color: white; }
.footer-legal { justify-content: flex-end; text-align: right; align-items: flex-end !important; }

.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; }

@media (max-width: 900px) {
  .hero-grid, .method-grid, .about-grid, .newsletter-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 48px; }
  .sticky-heading { position: static; }
  .publication { grid-template-columns: 1fr; gap: 12px; }
  .publication > a { justify-self: start; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-legal { align-items: flex-start !important; text-align: left; }
}

.newsletter-blurb { margin: 16px 0 0; max-width: 520px; font-size: 17px; color: var(--muted); }

/* Publication pages */
.pub-hero { padding: 92px 0 56px; border-bottom: 1px solid var(--rule); }
.crumbs { margin-bottom: 44px; color: var(--muted); font: 500 11px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.pub-hero h1 { max-width: 980px; margin-bottom: 24px; font-size: clamp(38px, 4.6vw, 64px); line-height: 1.02; letter-spacing: -0.035em; }
.pub-abstract { max-width: 780px; margin: 0; font-size: 21px; line-height: 1.4; color: #33352e; }
.pub-shell { padding: 56px 0 110px; }
.pub-metadata { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); margin: 0 0 64px; border: 1px solid var(--rule); background: var(--white); }
.pub-metadata > div { padding: 16px 18px; border-right: 1px solid var(--rule); }
.pub-metadata > div:last-child { border-right: 0; }
.pub-metadata dt { color: var(--muted); font: 500 10px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }
.pub-metadata dd { margin: 6px 0 0; font-size: 15px; }
.pub-body { max-width: 780px; font-size: 19px; }
.pub-body h2 { margin: 58px 0 18px; font-size: 30px; line-height: 1.1; }
.pub-body h2:first-of-type { margin-top: 0; }
.pub-body h3 { margin: 34px 0 12px; font-size: 21px; }
.pub-body p, .pub-body li { color: #33352e; }
.pub-body ul, .pub-body ol { padding-left: 22px; }
.pub-body li { margin-bottom: 10px; }
.table-wrap { overflow-x: auto; margin: 28px 0; }
.pub-body table { width: 100%; min-width: 520px; margin: 0; border-collapse: collapse; background: var(--white); font-size: 16px; }
.pub-body th, .pub-body td { padding: 10px 12px; border: 1px solid var(--rule); text-align: left; vertical-align: top; }
.pub-body th { font: 600 10px/1.4 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.06em; }
.pub-note { margin: 30px 0; padding: 20px 22px; border: 1px solid var(--rule); background: var(--white); }
.pub-note strong { font: 600 10px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.pub-note p { margin: 10px 0 0; font-size: 16px; color: var(--muted); }
.footnote { margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--rule); font-size: 15px; color: var(--muted); }
.pub-cite { max-width: 780px; margin: 64px 0 0; padding: 20px 22px; border: 1px solid var(--rule); background: var(--paper-deep); }
.pub-cite strong { font: 600 10px/1 "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.08em; }
.pub-cite p { margin: 10px 0 0; font-size: 15px; color: var(--muted); }

@media (max-width: 680px) {
  .shell { width: min(100% - 24px, 1180px); }
  .section { padding: 76px 0; }
  .menu-button { display: inline-block; }
  .primary-nav { display: none; position: absolute; top: 78px; left: 0; right: 0; padding: 18px 20px 24px; background: var(--paper); border-bottom: 1px solid var(--rule); flex-direction: column; align-items: flex-start; }
  .primary-nav.open { display: flex; }
  .brand-copy span { display: none; }
  .hero { padding: 72px 0; }
  h1 { font-size: 52px; }
  .ticker-grid { grid-template-columns: 1fr 1fr; }
  .ticker-grid div { border-bottom: 1px solid var(--rule); }
  .ticker-grid div:nth-child(2) { border-right: 0; }
  .ticker-grid div:first-child { padding-left: 24px; }
  .card-grid { grid-template-columns: 1fr; }
  .row-heading { align-items: flex-start; flex-direction: column; }
  .featured-publication { margin: 0; padding-left: 0; padding-right: 0; background: transparent; }
  .newsletter-form { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .pub-hero { padding: 60px 0 44px; }
  .pub-shell { padding: 44px 0 76px; }
  .pub-metadata { grid-template-columns: 1fr 1fr; }
  .pub-metadata > div { border-bottom: 1px solid var(--rule); }
  .pub-metadata > div:nth-child(even) { border-right: 0; }
}