:root {
  --yellow: #fcf80f;
  --grey: #dfdfd8;
  --black: #11151c;
  --white: #ffffff;
  --line: rgba(17, 21, 28, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--black);
  background: var(--grey);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.35;
}
a { color: inherit; }
.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  background: var(--white);
  padding: .7rem 1rem;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  min-height: 88px;
  padding: 1.1rem clamp(1.25rem, 4vw, 4.5rem);
  background: var(--yellow);
  border-bottom: 2px solid var(--black);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  text-decoration: none;
  font-size: clamp(1.4rem, 2.3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -.06em;
}
.brand-mark {
  display: inline-block;
  width: 2.25em;
  height: 1.05em;
  border: .18em solid var(--black);
  border-radius: 999px;
}
.brand small {
  font-size: .45em;
  font-weight: 500;
  letter-spacing: .02em;
}
.site-header nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.site-header nav a {
  font-size: .82rem;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.site-header nav a:hover,
.site-header nav a:focus { text-decoration: underline; text-underline-offset: .3em; }
.hero {
  min-height: 62vh;
  padding: clamp(3.5rem, 8vw, 8rem) clamp(1.25rem, 4vw, 4.5rem);
  display: grid;
  align-content: center;
  background: var(--yellow);
  border-bottom: 2px solid var(--black);
}
.eyebrow {
  margin: 0 0 1.4rem;
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
}
h1 {
  max-width: 1100px;
  margin: 0;
  font-size: clamp(3.3rem, 9vw, 8.8rem);
  line-height: .88;
  letter-spacing: -.07em;
}
.hero p:not(.eyebrow) {
  max-width: 760px;
  margin: 2.4rem 0 0;
  font-size: clamp(1.2rem, 2.1vw, 1.9rem);
}
.section {
  padding: clamp(4rem, 7vw, 7rem) clamp(1.25rem, 4vw, 4.5rem);
}
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .8fr);
  gap: 3rem;
  margin-bottom: 3rem;
}
h2 {
  margin: 0;
  font-size: clamp(2.6rem, 5vw, 5.5rem);
  line-height: .95;
  letter-spacing: -.055em;
}
.section-head p { margin: .3rem 0 0; font-size: 1.15rem; max-width: 600px; }
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 2px solid var(--black);
  border-left: 2px solid var(--black);
}
.topic-card {
  min-height: 330px;
  padding: clamp(1.5rem, 3vw, 3rem);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  border-right: 2px solid var(--black);
  border-bottom: 2px solid var(--black);
  transition: background .18s ease, color .18s ease;
}
.topic-card:hover,
.topic-card:focus { background: var(--yellow); }
.topic-card .number {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
}
.topic-card h3 {
  margin: auto 0 1rem;
  max-width: 620px;
  font-size: clamp(2.1rem, 4vw, 4.4rem);
  line-height: .92;
  letter-spacing: -.055em;
}
.topic-card p { max-width: 600px; margin: 0; font-size: 1rem; }
.tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1.5rem; }
.tag {
  padding: .35rem .65rem;
  border: 1px solid var(--black);
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.method { background: var(--black); color: var(--white); }
.method .section-head { margin-bottom: 4rem; }
.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid rgba(255,255,255,.5);
}
.step { padding: 1.4rem 1rem 1.4rem 0; border-bottom: 1px solid rgba(255,255,255,.5); }
.step b { display: block; color: var(--yellow); font-size: .75rem; margin-bottom: .7rem; }
.step span { font-size: 1.05rem; }
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem clamp(1.25rem, 4vw, 4.5rem);
  background: var(--yellow);
  border-top: 2px solid var(--black);
  font-size: .82rem;
}
.topic-hero { min-height: 50vh; }
.topic-hero h1 { max-width: 950px; font-size: clamp(3.2rem, 8vw, 7.5rem); }
.status-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  max-width: 1180px;
}
.status-panel h2 { font-size: clamp(2.4rem, 4vw, 4.2rem); }
.status-panel p { font-size: 1.15rem; }
.button {
  display: inline-block;
  margin-top: 1.4rem;
  padding: .85rem 1.1rem;
  background: var(--black);
  color: var(--white);
  border: 2px solid var(--black);
  text-decoration: none;
  font-weight: 700;
}
.button:hover,
.button:focus { background: var(--yellow); color: var(--black); }

.olive-hero { min-height: 76vh; }
.olive-hero h1 { max-width: 1200px; font-size: clamp(3.1rem, 7.8vw, 8rem); }
.text-link {
  width: fit-content;
  margin-top: 2rem;
  font-weight: 700;
  text-underline-offset: .35em;
}
.topic-intro,
.regulation-section,
.experiment-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .85fr);
  gap: clamp(2rem, 7vw, 8rem);
}
.lead-copy,
.regulation-copy { font-size: 1.13rem; }
.lead-copy p:first-child,
.regulation-copy p:first-child { margin-top: .2rem; }
.process-section { background: var(--white); }
.process-map { max-width: 1180px; margin: 1rem auto 3rem; }
.process-stage {
  padding: 1.5rem;
  border: 2px solid var(--black);
  background: var(--grey);
}
.process-stage span,
.fact-grid article > span,
.paper-list a > span {
  display: block;
  margin-bottom: 1rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.process-stage h3 { margin: 0 0 .75rem; font-size: clamp(1.5rem, 3vw, 2.7rem); line-height: .95; letter-spacing: -.045em; }
.process-stage p { margin: 0; }
.process-stage small { display: block; margin-top: 1rem; font-weight: 700; }
.stage-wide { max-width: 780px; margin: 0 auto; text-align: center; }
.stage-accent { background: var(--yellow); }
.process-arrow { padding: .7rem; text-align: center; font-size: 1.6rem; font-weight: 700; }
.branch-label {
  max-width: 780px;
  margin: 0 auto;
  padding: .7rem 1rem;
  background: var(--black);
  color: var(--white);
  text-align: center;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.process-branches {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.process-branches .process-stage { display: flex; flex-direction: column; min-height: 285px; }
.process-branches strong { display: block; margin-top: auto; padding-top: 1.5rem; }
.science-note {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2rem;
  border-top: 2px solid var(--black);
  border-bottom: 2px solid var(--black);
}
.science-note p { margin: 0; }
.compounds { background: var(--black); color: var(--white); }
.fact-grid,
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid currentColor;
  border-left: 1px solid currentColor;
}
.fact-grid article,
.evidence-card {
  min-height: 260px;
  padding: clamp(1.4rem, 3vw, 2.5rem);
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
}
.fact-grid h3,
.evidence-card h3 { margin: 0 0 1rem; font-size: clamp(1.9rem, 3.5vw, 3.6rem); line-height: .95; letter-spacing: -.05em; }
.fact-grid p,
.evidence-card p { max-width: 560px; }
.evidence-section { background: var(--yellow); }
.evidence-card { display: flex; flex-direction: column; background: var(--grey); }
.evidence-level {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--black);
  font-size: .78rem;
}
.evidence-level b { text-align: right; text-transform: uppercase; letter-spacing: .05em; }
.regulation-section { background: var(--black); color: var(--white); }
.regulation-copy li { margin-bottom: 1rem; }
.small-print { font-size: .78rem; opacity: .8; }
.readiness-table { border-top: 2px solid var(--black); }
.table-row {
  display: grid;
  grid-template-columns: 1.1fr .55fr 1.5fr;
  gap: 2rem;
  align-items: center;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--black);
}
.table-head {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.readiness {
  width: fit-content;
  padding: .35rem .65rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.readiness.high { background: var(--yellow); }
.readiness.low { background: var(--black); color: var(--white); }
.papers-section { background: var(--white); }
.paper-list { border-top: 2px solid var(--black); }
.paper-list a {
  position: relative;
  display: grid;
  grid-template-columns: .65fr 1.7fr .35fr;
  gap: 2rem;
  align-items: start;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--black);
  text-decoration: none;
}
.paper-list a:hover strong,
.paper-list a:focus strong { text-decoration: underline; text-underline-offset: .25em; }
.paper-list a > span { margin: 0; }
.paper-list em { text-align: right; font-style: normal; font-size: .78rem; font-weight: 700; }
.library-note { max-width: 850px; margin: 2rem 0 0 auto; }
.experiment-section { background: var(--yellow); }
.experiment-list { display: flex; flex-wrap: wrap; gap: .55rem; margin: 1.5rem 0; }
.experiment-list span { padding: .55rem .75rem; border: 1px solid var(--black); border-radius: 999px; font-weight: 700; font-size: .78rem; }
.topic-pagination {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem clamp(1.25rem, 4vw, 4.5rem);
  border-top: 2px solid var(--black);
  background: var(--grey);
}
.topic-pagination a { font-weight: 700; }

@media (max-width: 800px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .section-head, .status-panel, .topic-intro, .regulation-section, .experiment-section { grid-template-columns: 1fr; gap: 1.5rem; }
  .topic-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .process-branches, .fact-grid, .evidence-grid { grid-template-columns: 1fr; }
  .process-branches .process-stage { min-height: 230px; }
  .science-note { grid-template-columns: 1fr; gap: .6rem; }
  .table-row { grid-template-columns: 1fr; gap: .65rem; }
  .table-head { display: none; }
  .paper-list a { grid-template-columns: 1fr; gap: .55rem; }
  .paper-list em { text-align: left; }
  .site-footer { flex-direction: column; }
}
@media (max-width: 480px) {
  .site-header nav { gap: .8rem; }
  .steps { grid-template-columns: 1fr; }
  h1 { font-size: 3.2rem; }
  .olive-hero h1 { font-size: 2.85rem; }
  .topic-pagination { flex-direction: column; }
}