:root {
  --ink: #171713;
  --ink-soft: #4d4b44;
  --paper: #f4efe5;
  --paper-deep: #e8dfcf;
  --white: #fffdf8;
  --cobalt: #1646d8;
  --cobalt-dark: #0f2d86;
  --vermilion: #e54a2f;
  --rule: rgba(23, 23, 19, 0.2);
  --rule-strong: rgba(23, 23, 19, 0.48);
  --max: 1180px;
  --serif: Iowan Old Style, Baskerville, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  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: 1.55;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(23, 23, 19, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 23, 19, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
  content: "";
  pointer-events: none;
}

body::after {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(112deg, rgba(244, 239, 229, 0.96) 0 48%, rgba(244, 239, 229, 0.72) 100%);
  content: "";
  pointer-events: none;
}

a {
  color: inherit;
}

img,
iframe {
  display: block;
  max-width: 100%;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  color: var(--white);
  background: var(--cobalt);
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 0;
  height: 3px;
  background: var(--vermilion);
  transition: width 80ms linear;
}

.site-header {
  position: relative;
  z-index: 50;
  border-bottom: 1px solid var(--rule-strong);
  background: rgba(244, 239, 229, 0.92);
  backdrop-filter: blur(14px);
}

.header-inner,
.section-inner,
.footer-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 78px;
}

.wordmark {
  display: inline-flex;
  gap: 0.25rem;
  align-items: baseline;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.wordmark-mark {
  color: var(--vermilion);
  font-family: var(--sans);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav {
  justify-self: end;
}

.nav-list {
  display: flex;
  gap: clamp(0.8rem, 2.2vw, 2rem);
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  position: relative;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.095em;
  text-decoration: none;
  text-transform: uppercase;
}

.nav-list a::after {
  position: absolute;
  right: 0;
  bottom: -0.45rem;
  left: 0;
  height: 2px;
  background: var(--vermilion);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.nav-list a:hover,
.nav-list a:focus-visible,
.nav-list a[aria-current="page"] {
  color: var(--ink);
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after,
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  font: 800 0.68rem/1 var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main {
  overflow: hidden;
}

.section {
  padding-block: clamp(4.5rem, 9vw, 8rem);
  border-bottom: 1px solid var(--rule-strong);
}

.section-dark {
  color: var(--white);
  background: var(--ink);
}

.section-cobalt {
  color: var(--white);
  background: var(--cobalt);
}

.eyebrow {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  margin: 0 0 1.35rem;
  color: var(--cobalt);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 2.4rem;
  height: 2px;
  background: currentColor;
  content: "";
}

.section-dark .eyebrow,
.section-cobalt .eyebrow {
  color: #9fb5ff;
}

.section-cobalt .eyebrow {
  color: var(--white);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

h1,
h2 {
  font-family: var(--serif);
  font-weight: 650;
  letter-spacing: -0.052em;
  line-height: 0.94;
}

h1 {
  max-width: 11ch;
  margin-bottom: 1.6rem;
  font-size: clamp(3.7rem, 8.7vw, 8.2rem);
}

h2 {
  max-width: 15ch;
  margin-bottom: 1.4rem;
  font-size: clamp(2.6rem, 5.6vw, 5.6rem);
}

h3 {
  margin-bottom: 0.75rem;
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.3;
}

.display-accent {
  color: var(--cobalt);
  font-style: italic;
}

.section-dark .display-accent,
.section-cobalt .display-accent {
  color: #b4c4ff;
}

.lede {
  max-width: 47rem;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.2vw, 1.72rem);
  line-height: 1.45;
}

.section-dark .lede,
.section-cobalt .lede {
  color: rgba(255, 253, 248, 0.78);
}

.body-large {
  max-width: 42rem;
  font-size: clamp(1.08rem, 1.5vw, 1.3rem);
  line-height: 1.7;
}

.small-note {
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.section-dark .small-note,
.section-cobalt .small-note {
  color: rgba(255, 253, 248, 0.64);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0.85rem 1.2rem;
  border: 1px solid var(--ink);
  color: var(--white);
  background: var(--ink);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.button:hover,
.button:focus-visible {
  color: var(--white);
  background: var(--cobalt);
  transform: translateY(-2px);
}

.button-outline {
  color: var(--ink);
  background: transparent;
}

.button-light {
  border-color: var(--white);
  color: var(--ink);
  background: var(--white);
}

.button-light:hover,
.button-light:focus-visible {
  color: var(--ink);
  background: #cad5ff;
}

.button::after {
  content: "↗";
  font-size: 1rem;
}

.button[data-direction="down"]::after {
  content: "↓";
}

.hero {
  position: relative;
  padding-block: clamp(4rem, 8vw, 7.5rem) clamp(3.5rem, 7vw, 6.5rem);
  border-bottom: 1px solid var(--rule-strong);
}

.hero::after {
  position: absolute;
  right: -7vw;
  bottom: -10rem;
  width: min(48vw, 700px);
  height: 19rem;
  border: 2px solid var(--cobalt);
  border-radius: 50%;
  content: "";
  opacity: 0.14;
  transform: rotate(-14deg);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(290px, 0.72fr);
  gap: clamp(2.5rem, 6vw, 7rem);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero-kicker {
  max-width: 38rem;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
}

.portrait-frame {
  position: relative;
  z-index: 2;
  padding: 0.75rem;
  border: 1px solid var(--rule-strong);
  background: var(--paper-deep);
  box-shadow: 20px 20px 0 var(--cobalt);
  transform: rotate(1.5deg);
}

.portrait-frame::before {
  position: absolute;
  top: -2.2rem;
  right: -1.2rem;
  width: 4.8rem;
  height: 4.8rem;
  border-radius: 50%;
  background: var(--vermilion);
  content: "";
  mix-blend-mode: multiply;
}

.identity-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 520px;
  aspect-ratio: 4 / 5;
  background:
    radial-gradient(circle at 78% 24%, transparent 0 19%, rgba(255, 253, 248, 0.72) 19.2% 19.8%, transparent 20%),
    radial-gradient(circle at 76% 25%, transparent 0 33%, rgba(255, 253, 248, 0.36) 33.2% 33.7%, transparent 34%),
    linear-gradient(rgba(255, 253, 248, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 253, 248, 0.16) 1px, transparent 1px),
    var(--cobalt);
  background-size: auto, auto, 28px 28px, 28px 28px, auto;
  color: var(--white);
  overflow: hidden;
}

.identity-panel::after {
  position: absolute;
  right: -18%;
  bottom: 19%;
  left: -18%;
  height: 26%;
  border: 4px solid var(--vermilion);
  border-color: var(--vermilion) transparent transparent;
  border-radius: 50%;
  content: "";
  transform: rotate(-7deg);
}

.identity-coordinate {
  position: relative;
  z-index: 2;
  display: block;
  padding: 0.5rem 0.25rem;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.identity-monogram {
  position: relative;
  z-index: 2;
  display: block;
  margin: auto 0;
  font-family: var(--serif);
  font-size: clamp(8rem, 18vw, 14rem);
  font-weight: 600;
  letter-spacing: -0.12em;
  line-height: 0.7;
}

.identity-panel .portrait-caption {
  position: relative;
  z-index: 2;
  color: var(--ink);
  background: var(--paper-deep);
}

.portrait-caption {
  display: flex;
  justify-content: space-between;
  margin: 0;
  padding: 0.7rem 0.25rem 0.1rem;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.fact-strip {
  border-bottom: 1px solid var(--rule-strong);
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.fact {
  min-height: 124px;
  padding: 1.5rem;
  border-right: 1px solid var(--rule-strong);
}

.fact:last-child {
  border-right: 0;
}

.fact-label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--vermilion);
  font-size: 0.65rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.fact-value {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  line-height: 1.2;
}

.intro-grid,
.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(3rem, 8vw, 9rem);
  align-items: start;
}

.section-number {
  display: block;
  margin-bottom: 1.5rem;
  color: var(--vermilion);
  font: 800 0.7rem/1 var(--sans);
  letter-spacing: 0.14em;
}

.statement {
  max-width: 17ch;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4.5vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: clamp(3rem, 7vw, 6rem);
  border-top: 1px solid rgba(255, 253, 248, 0.35);
  border-left: 1px solid rgba(255, 253, 248, 0.35);
}

.track {
  position: relative;
  min-height: 330px;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border-right: 1px solid rgba(255, 253, 248, 0.35);
  border-bottom: 1px solid rgba(255, 253, 248, 0.35);
  overflow: hidden;
}

.track::after {
  position: absolute;
  right: -4rem;
  bottom: -6rem;
  width: 13rem;
  height: 13rem;
  border: 1px solid rgba(255, 253, 248, 0.28);
  border-radius: 50%;
  content: "";
}

.track-index {
  display: block;
  margin-bottom: 4.5rem;
  color: #aebeff;
  font: 800 0.68rem/1 var(--sans);
  letter-spacing: 0.13em;
}

.track h3 {
  font-family: var(--serif);
  font-size: clamp(2rem, 3vw, 3.2rem);
  letter-spacing: -0.04em;
}

.track p {
  max-width: 24rem;
  color: rgba(255, 253, 248, 0.69);
}

.video-shell {
  position: relative;
  margin-top: 3rem;
  padding: clamp(0.6rem, 1.5vw, 1.1rem);
  border: 1px solid var(--rule-strong);
  background: var(--paper-deep);
  box-shadow: 14px 14px 0 var(--vermilion);
}

.video-shell::before {
  display: block;
  padding-bottom: 56.25%;
  content: "";
}

.video-shell iframe {
  position: absolute;
  top: clamp(0.6rem, 1.5vw, 1.1rem);
  left: clamp(0.6rem, 1.5vw, 1.1rem);
  width: calc(100% - clamp(1.2rem, 3vw, 2.2rem));
  height: calc(100% - clamp(1.2rem, 3vw, 2.2rem));
  border: 0;
  background: #111;
}

.video-meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
  margin-top: 2rem;
}

.video-meta p {
  max-width: 42rem;
  color: var(--ink-soft);
}

.signal-panel {
  position: relative;
  min-height: 310px;
  border: 1px solid var(--rule-strong);
  background:
    linear-gradient(rgba(22, 70, 216, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 70, 216, 0.13) 1px, transparent 1px),
    var(--white);
  background-size: 24px 24px;
  overflow: hidden;
}

.signal-panel::before,
.signal-panel::after {
  position: absolute;
  left: -8%;
  width: 116%;
  height: 36%;
  border: 6px solid var(--cobalt);
  border-color: var(--cobalt) transparent transparent;
  border-radius: 50%;
  content: "";
  transform: rotate(-4deg);
}

.signal-panel::before {
  top: 36%;
}

.signal-panel::after {
  top: 51%;
  border-width: 3px;
  border-color: var(--vermilion) transparent transparent;
  opacity: 0.75;
  transform: rotate(5deg) scaleX(0.75);
}

.signal-formula {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  padding: 0.45rem 0.65rem;
  color: var(--white);
  background: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1rem, 2vw, 1.5rem);
}

.signal-label {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.paper-list {
  margin-top: 3rem;
  border-top: 1px solid var(--rule-strong);
}

.paper-row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1.4fr) minmax(190px, 0.58fr) auto;
  gap: 1.25rem;
  align-items: center;
  min-height: 120px;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--rule-strong);
}

.paper-number {
  color: var(--vermilion);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.13em;
}

.paper-row h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.2vw, 1.85rem);
  letter-spacing: -0.025em;
}

.paper-meta {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.83rem;
}

.paper-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 43px;
  height: 43px;
  border: 1px solid var(--ink);
  font-weight: 800;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease;
}

.paper-link:hover,
.paper-link:focus-visible {
  color: var(--white);
  background: var(--cobalt);
}

.paper-link span {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.paper-link::after {
  content: "↗";
}

.research-clusters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 3rem;
  border: 1px solid var(--rule-strong);
  background: var(--rule-strong);
}

.cluster-card {
  min-height: 260px;
  padding: clamp(1.4rem, 3vw, 2.3rem);
  background: var(--paper);
}

.cluster-card strong {
  display: block;
  margin-bottom: 2.5rem;
  color: var(--cobalt);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.cluster-card h3 {
  font-family: var(--serif);
  font-size: 1.75rem;
  letter-spacing: -0.035em;
}

.cluster-card p {
  color: var(--ink-soft);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 3.5rem;
  border: 1px solid rgba(255, 253, 248, 0.35);
}

.process-step {
  min-height: 220px;
  padding: 1.5rem;
  border-right: 1px solid rgba(255, 253, 248, 0.35);
}

.process-step:last-child {
  border-right: 0;
}

.process-step strong {
  display: block;
  margin-bottom: 3rem;
  color: #b7c5ff;
  font: 800 0.68rem/1 var(--sans);
  letter-spacing: 0.13em;
}

.process-step h3 {
  font-family: var(--serif);
  font-size: 1.6rem;
}

.process-step p {
  color: rgba(255, 253, 248, 0.68);
  font-size: 0.9rem;
}

.page-hero {
  position: relative;
  padding-block: clamp(5rem, 10vw, 9rem);
  border-bottom: 1px solid var(--rule-strong);
}

.page-hero h1 {
  max-width: 12ch;
}

.page-hero .lede {
  max-width: 42rem;
}

.page-index {
  position: absolute;
  top: 50%;
  right: max(20px, calc((100vw - var(--max)) / 2));
  color: rgba(22, 70, 216, 0.12);
  font-family: var(--serif);
  font-size: clamp(10rem, 24vw, 23rem);
  line-height: 0;
  pointer-events: none;
  transform: translateY(-45%);
}

.timeline {
  margin-top: 3rem;
  border-left: 2px solid var(--cobalt);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 2rem;
  padding: 0 0 3.4rem 2.2rem;
}

.timeline-item::before {
  position: absolute;
  top: 0.2rem;
  left: -0.48rem;
  width: 0.8rem;
  height: 0.8rem;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--vermilion);
  content: "";
}

.timeline-year {
  color: var(--cobalt);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.timeline-item h3 {
  margin-bottom: 0.45rem;
  font-family: var(--serif);
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.timeline-item p {
  max-width: 42rem;
  color: var(--ink-soft);
}

.wheel-wrap {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 0.82fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: center;
  margin-top: 3rem;
}

.topic-wheel {
  position: relative;
  width: min(100%, 610px);
  aspect-ratio: 1;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 49.8%, var(--rule) 49.8% 50.2%, transparent 50.2%),
    linear-gradient(transparent 49.8%, var(--rule) 49.8% 50.2%, transparent 50.2%),
    var(--paper-deep);
}

.topic-wheel::before,
.topic-wheel::after {
  position: absolute;
  inset: 12%;
  border: 1px solid var(--rule);
  border-radius: 50%;
  content: "";
}

.topic-wheel::after {
  inset: 27%;
  border-style: dashed;
  transform: rotate(14deg);
}

.wheel-center,
.wheel-node {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  text-align: center;
}

.wheel-center {
  top: 50%;
  left: 50%;
  width: 31%;
  aspect-ratio: 1;
  padding: 1rem;
  color: var(--white);
  background: var(--cobalt);
  font-family: var(--serif);
  font-size: clamp(1rem, 2.4vw, 1.8rem);
  line-height: 1.05;
  transform: translate(-50%, -50%);
}

.wheel-node {
  width: 22%;
  aspect-ratio: 1;
  padding: 0.7rem;
  background: var(--paper);
  font-size: clamp(0.56rem, 1.25vw, 0.78rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.15;
  text-transform: uppercase;
}

.wheel-node:nth-of-type(2) { top: -2%; left: 39%; }
.wheel-node:nth-of-type(3) { top: 16%; right: 0; }
.wheel-node:nth-of-type(4) { right: 2%; bottom: 15%; }
.wheel-node:nth-of-type(5) { bottom: -2%; left: 39%; }
.wheel-node:nth-of-type(6) { bottom: 15%; left: 2%; }
.wheel-node:nth-of-type(7) { top: 16%; left: 0; }

.topic-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: topics;
}

.topic-list li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 1rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--rule-strong);
  counter-increment: topics;
}

.topic-list li::before {
  color: var(--vermilion);
  content: "0" counter(topics);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.topic-list strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.topic-list span {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.tree-map {
  display: grid;
  gap: 1.2rem;
  margin-top: 4rem;
}

.tree-tier {
  position: relative;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 2rem;
  align-items: stretch;
}

.tree-tier + .tree-tier::before {
  position: absolute;
  top: -1.25rem;
  left: calc(160px + 1rem);
  width: 2px;
  height: 1.25rem;
  background: var(--vermilion);
  content: "";
}

.tree-label {
  display: grid;
  place-items: center;
  min-height: 130px;
  border: 1px solid rgba(255, 253, 248, 0.4);
  color: #b8c7ff;
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.tree-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255, 253, 248, 0.35);
}

.tree-card {
  min-height: 130px;
  padding: 1.35rem;
  background: var(--ink);
}

.tree-card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
}

.tree-card p {
  margin: 0;
  color: rgba(255, 253, 248, 0.64);
  font-size: 0.86rem;
}

.citation-note {
  margin-top: 3rem;
  padding: 1.25rem 1.4rem;
  border-left: 4px solid var(--vermilion);
  background: var(--paper-deep);
}

.citation-note strong {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.citation-note p {
  margin: 0;
  color: var(--ink-soft);
}

.source-hero h1 {
  margin-top: 2rem;
}

.source-lockup {
  display: flex;
  gap: 1rem;
  align-items: center;
  width: fit-content;
  padding: 0.75rem 1rem;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--paper-deep);
  font-family: var(--sans);
  font-size: clamp(1.15rem, 2.5vw, 1.8rem);
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-glyph {
  padding-right: 1rem;
  border-right: 2px solid var(--vermilion);
  color: var(--cobalt);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.article-copy h3 {
  margin-top: 2.5rem;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 3vw, 2.4rem);
  letter-spacing: -0.035em;
}

.article-copy p {
  max-width: 48rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.8;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 3.5rem;
  border: 1px solid rgba(255, 253, 248, 0.35);
  background: rgba(255, 253, 248, 0.35);
}

.method-step {
  min-height: 280px;
  padding: clamp(1.5rem, 3vw, 2.4rem);
  background: var(--ink);
}

.method-step strong,
.proof-grid strong {
  display: block;
  margin-bottom: 3rem;
  color: #b7c5ff;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
}

.method-step h3 {
  font-family: var(--serif);
  font-size: 1.8rem;
  letter-spacing: -0.035em;
}

.method-step p {
  color: rgba(255, 253, 248, 0.68);
}

.claim-table {
  margin-top: 3rem;
  border-top: 1px solid var(--rule-strong);
}

.claim-row {
  display: grid;
  grid-template-columns: minmax(220px, 1.25fr) minmax(190px, 1fr) minmax(100px, 0.45fr) minmax(110px, 0.5fr);
  gap: 1.5rem;
  padding: 1.25rem;
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}

.claim-head {
  color: var(--white);
  background: var(--ink);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.claim-row a {
  color: var(--cobalt);
  font-weight: 800;
}

.status-verified,
.status-unknown {
  display: inline-block;
  color: var(--cobalt);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-unknown {
  color: var(--vermilion);
}

.video-shell-vertical {
  width: min(100%, 560px);
  margin-inline: auto;
}

.video-shell-vertical::before {
  padding-bottom: 177.78%;
}

.timestamp-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 3rem;
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}

.timestamp-list div {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 1rem;
  padding: 1.1rem;
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.timestamp-list b {
  color: var(--vermilion);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 3rem;
  border: 1px solid rgba(255, 253, 248, 0.35);
  background: rgba(255, 253, 248, 0.35);
}

.proof-grid article {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  background: var(--ink);
}

.proof-grid ul {
  margin: 0;
  padding-left: 1.2rem;
  color: rgba(255, 253, 248, 0.75);
}

.proof-grid li + li {
  margin-top: 0.75rem;
}

.source-list {
  margin-top: 3rem;
  border-top: 1px solid var(--rule-strong);
}

.source-list a {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 2rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule-strong);
  text-decoration: none;
}

.source-list span {
  color: var(--vermilion);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.source-list b {
  font-family: var(--serif);
  font-size: 1.25rem;
}

.source-list a:hover b,
.source-list a:focus-visible b {
  color: var(--cobalt);
}

.cta-band {
  position: relative;
  padding-block: clamp(4rem, 8vw, 7rem);
  overflow: hidden;
}

.cta-band::after {
  position: absolute;
  right: -4rem;
  bottom: -8rem;
  width: 26rem;
  height: 26rem;
  border: 1px solid rgba(255, 253, 248, 0.55);
  border-radius: 50%;
  content: "";
}

.cta-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) auto;
  gap: 3rem;
  align-items: end;
}

.cta-grid h2 {
  margin: 0;
}

.site-footer {
  padding-block: 2.5rem;
  color: var(--white);
  background: var(--ink);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
}

.footer-tagline {
  margin: 0.8rem 0 0;
  color: rgba(255, 253, 248, 0.58);
  font-family: var(--serif);
  font-size: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.4rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: rgba(255, 253, 248, 0.72);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-decoration: none;
  text-transform: uppercase;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--white);
}

@media (max-width: 940px) {
  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 1rem 20px 1.4rem;
    border-bottom: 1px solid var(--ink);
    background: var(--paper);
  }

  .site-nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    display: grid;
    gap: 0;
  }

  .nav-list a {
    display: block;
    padding-block: 0.85rem;
    border-bottom: 1px solid var(--rule);
  }

  .nav-list a::after {
    display: none;
  }

  .hero-grid,
  .intro-grid,
  .split-grid,
  .wheel-wrap {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  .portrait-frame {
    width: min(72vw, 470px);
    margin-inline: auto;
  }

  .track-grid,
  .research-clusters,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .track {
    min-height: 250px;
  }

  .track-index {
    margin-bottom: 2.5rem;
  }

  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-step:nth-child(2) {
    border-right: 0;
  }

  .process-step:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 253, 248, 0.35);
  }

  .paper-row {
    grid-template-columns: 54px 1fr auto;
  }

  .paper-meta {
    grid-column: 2;
  }

  .paper-link {
    grid-row: 1 / 3;
    grid-column: 3;
  }

  .tree-tier {
    grid-template-columns: 100px 1fr;
  }

  .tree-tier + .tree-tier::before {
    left: calc(100px + 1rem);
  }

  .tree-cards {
    grid-template-columns: 1fr;
  }

  .page-index {
    display: none;
  }

  .claim-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .header-inner,
  .section-inner,
  .footer-inner {
    width: min(calc(100% - 28px), var(--max));
  }

  .header-inner {
    min-height: 68px;
  }

  h1 {
    font-size: clamp(3.25rem, 17vw, 5.1rem);
  }

  h2 {
    font-size: clamp(2.4rem, 13vw, 4rem);
  }

  .fact-grid {
    grid-template-columns: 1fr;
  }

  .fact {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--rule-strong);
  }

  .fact:last-child {
    border-bottom: 0;
  }

  .video-meta,
  .cta-grid,
  .footer-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .paper-row {
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
    padding-block: 1.4rem;
  }

  .paper-number,
  .paper-meta {
    grid-column: 1;
  }

  .paper-link {
    grid-row: 1 / 4;
    grid-column: 2;
  }

  .process-grid {
    grid-template-columns: 1fr;
  }

  .process-step,
  .process-step:nth-child(2) {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 253, 248, 0.35);
  }

  .process-step:last-child {
    border-bottom: 0;
  }

  .process-step strong {
    margin-bottom: 1.5rem;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }

  .topic-wheel {
    width: calc(100% - 14px);
    margin-inline: auto;
  }

  .wheel-node {
    width: 24%;
    font-size: 0.48rem;
  }

  .tree-tier {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .tree-tier + .tree-tier::before {
    display: none;
  }

  .tree-label {
    min-height: 48px;
  }

  .tree-card {
    min-height: auto;
  }

  .footer-links {
    flex-wrap: wrap;
  }

  .claim-row,
  .timestamp-list,
  .proof-grid,
  .source-list a {
    grid-template-columns: 1fr;
  }

  .claim-head {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}