@font-face {
  font-family: Inter;
  src: url("./fonts/InterVariable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
:root {
  --paper: #ece9df;
  --ink: #20211d;
  --red: #ac301b;
  --line: #b4b1a6;
  --muted: #585a51;
  --signal: #e3ef8c;
  --gutter: clamp(22px, 5vw, 88px);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-underline-offset: 5px;
}
button,
input,
a {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
input:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 6px;
}
.skip {
  position: absolute;
  z-index: 5;
  left: 20px;
  top: -80px;
  padding: 12px;
  background: var(--ink);
  color: var(--paper);
}
.skip:focus {
  top: 12px;
}
.mast {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px var(--gutter);
  border-bottom: 1px solid var(--line);
  gap: 20px;
}
.wordmark {
  white-space: nowrap;
  font-weight: 650;
  text-decoration: none;
  font-size: 19px;
  letter-spacing: -0.7px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.mark {
  font-size: 34px;
  line-height: 1;
  color: var(--red);
}
nav {
  display: flex;
  gap: 32px;
  font-size: 13px;
}
nav a {
  white-space: nowrap;
  text-decoration: none;
}
nav a:hover,
.footer-links a:hover {
  text-decoration: underline;
}
.hero {
  padding: 32px var(--gutter) 80px;
}
.hero-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 10px;
  font-weight: 550;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(48px, 8.55vw, 144px);
  font-weight: 580;
  letter-spacing: -0.055em;
  line-height: 1.02;
  margin: 77px 0 58px;
}
.hero h1 span {
  color: var(--red);
}
.hero-bottom {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 8vw;
  border-top: 1px solid var(--line);
  padding-top: 32px;
}
.study-mark {
  display: flex;
  align-items: flex-end;
  gap: 20px;
}
.study-mark svg {
  width: clamp(140px, 17vw, 240px);
  height: auto;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1;
}
.study-mark .point {
  fill: var(--red);
  stroke: none;
}
.study-mark span {
  font-size: 11px;
  max-width: 80px;
  line-height: 1.5;
}
.opening p {
  max-width: 52ch;
}
.lead {
  font-size: clamp(21px, 2.1vw, 32px);
  letter-spacing: -0.7px;
  line-height: 1.4;
  margin: 0 0 24px;
  font-weight: 450;
}
p {
  font-size: 16px;
  line-height: 1.65;
  margin: 0 0 24px;
}
.opening > p:not(.lead) {
  color: var(--muted);
}
.read-link {
  display: flex;
  justify-content: space-between;
  max-width: 100%;
  border-bottom: 1px solid var(--ink);
  padding: 15px 0 12px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 650;
  margin-top: 28px;
}
.read-link span {
  font-size: 22px;
}
.section {
  padding: 64px var(--gutter) 96px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 8vw;
  border-top: 1px solid var(--ink);
}
.section-label > span,
.eyebrow {
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 32px;
}
.section-label h2 {
  font-size: clamp(27px, 3vw, 44px);
  font-weight: 550;
  line-height: 1.13;
  letter-spacing: -1.7px;
  margin: 0 0 28px;
}
.section-label p {
  font-size: 13px;
  color: var(--muted);
}
.principle {
  display: grid;
  grid-template-columns: 35px 1fr;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding: 29px 0 31px;
}
.principle:first-child {
  padding-top: 0;
  border-top: 0;
}
.principle:last-child {
  padding-bottom: 0;
}
.number {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--red);
  padding-top: 7px;
}
.principle h3 {
  font-size: clamp(23px, 2.2vw, 33px);
  line-height: 1.2;
  letter-spacing: -1px;
  font-weight: 550;
  margin: 0 0 16px;
}
.principle p {
  max-width: 52ch;
  color: var(--muted);
  margin: 0;
}
.experiment {
  background: var(--ink);
  color: var(--paper);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 32px 64px;
  padding: 72px var(--gutter) 64px;
}
.experiment h2 {
  font-size: 38px;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.14;
  margin: 0 0 27px;
}
.experiment p {
  max-width: 43ch;
}
.experiment .caption {
  font-size: 12px;
  color: #c1c2b7;
}
.control {
  margin-top: 42px;
}
.control label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}
.control output {
  font-variant-numeric: tabular-nums;
}
.control input {
  width: 100%;
  accent-color: var(--signal);
  height: 36px;
  margin: 10px 0 0;
}
.control input:focus-visible {
  outline-color: var(--signal);
  outline-offset: 2px;
}
.control p {
  font-size: 11px;
  color: #c1c2b7;
  margin: 0;
}
.apparatus {
  grid-column: 1 / -1;
  align-self: center;
  min-width: 0;
}
.apparatus svg {
  width: 100%;
  display: block;
  color: #73776a;
  background: var(--ink);
  height: 360px;
  border-radius: 4px;
  overflow: hidden;
}
.grid {
  opacity: 0.45;
}
.axis {
  stroke: #8d9380;
  stroke-width: 1;
  fill: none;
}
.large-point {
  fill: var(--signal);
}
.small-point {
  fill: var(--paper);
}
.apparatus-caption {
  position: relative;
  background: var(--ink);
  border-top: 1px solid #73776a;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 17px;
  font-size: 10px;
  color: #c1c2b7;
  line-height: 1.6;
}
.experiment *, .experiment .eyebrow { letter-spacing: 0; }
.study-heading { min-width: 0; }
.study-heading .caption { max-width: 52ch; margin-bottom: 0; }
.study-controls { display: grid; align-content: center; gap: 26px; min-width: 0; }
.study-controls .control { margin: 0; }
.control label { font-size: 15px; font-weight: 600; }
.range-ends { display: flex; justify-content: space-between; color: #c1c2b7; font-size: 12px; }
#study circle { fill: var(--paper); stroke: var(--paper); transition: cx 180ms ease-out, cy 180ms ease-out, r 180ms ease-out, fill 180ms; }
#study circle { stroke-width: 2; }
#study-links { fill: none; stroke: var(--paper); stroke-linejoin: round; stroke-linecap: round; opacity: .62; }
#study-links path { transition: stroke-width 180ms, stroke 180ms; }
.depth-readout { display: flex; gap: 16px; align-items: baseline; font-variant-numeric: tabular-nums; }
.depth-readout output { color: #e3ef8c; font-weight: 600; }
.study-values { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; gap: 22px 24px; }
.study-values > div { border-top: 1px solid #73776a; padding-top: 12px; min-width: 0; }
.study-values dt { color: #c1c2b7; font-size: 12px; margin-bottom: 8px; }
.study-values dd { display: flex; align-items: center; gap: 8px; margin: 0; min-height: 24px; font-size: 16px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.swatch { width: 16px; height: 16px; flex: 0 0 16px; border: 1px solid #c1c2b7; }
.specimen {
  --sample-font: Inter, Arial, sans-serif; --sample-weight: 600; --sample-heading: 31px;
  --sample-gap: 26px; --sample-leading: 1.53; --sample-radius: 2px;
  --sample-accent: #5d3e52; --sample-surface: #f4f0f3; --sample-ink: #20211d;
  grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: var(--sample-gap); padding: 32px; background: var(--sample-surface); color: var(--sample-ink);
  border-radius: var(--sample-radius); min-height: 390px;
}
.specimen article { min-width: 0; }
.sample-kicker { display: block; font-size: 12px; color: var(--sample-accent); margin-bottom: var(--sample-gap); }
.specimen h3 { font-family: var(--sample-font); font-size: var(--sample-heading); font-weight: var(--sample-weight); line-height: 1.15; margin: 0 0 var(--sample-gap); overflow-wrap: anywhere; }
.specimen p { font-size: 15px; line-height: var(--sample-leading); max-width: 40ch; margin-bottom: var(--sample-gap); }
.sample-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.sample-tags span { font-size: 12px; border-bottom: 2px solid var(--sample-accent); padding-bottom: 5px; }
.specimen-schedule { border-left: 1px solid var(--sample-accent); padding-left: var(--sample-gap); }
.specimen-schedule dl { margin: 0; }
.specimen-schedule dl > div { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 12px; padding-block: calc(var(--sample-gap) / 2); border-top: 1px solid var(--sample-accent); font-size: 14px; }
.specimen-schedule dd { margin: 0; }
.specimen-schedule dt { font-variant-numeric: tabular-nums; }
.prompt-field { grid-column: 1 / -1; border-top: 1px solid #73776a; padding-top: 24px; }
.prompt-field h3 { font-size: 16px; font-weight: 600; margin: 0 0 14px; }
.prompt-field p { max-width: 74ch; font-size: 15px; margin: 0; line-height: 1.7; }
.prompt-field #sample-prompt { min-height: 150px; }
.prompt-field .depth-readout { margin-bottom: 20px; }
@media (max-width: 700px) {
  .experiment { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .experiment h2 { font-size: 30px; }
  .apparatus svg { height: auto; aspect-ratio: 5 / 3; }
  .study-values { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .specimen { grid-template-columns: minmax(0, 1fr); padding: 20px; min-height: 690px; }
  .specimen-schedule { border-left: 0; border-top: 1px solid var(--sample-accent); padding-left: 0; padding-top: var(--sample-gap); }
  .prompt-field #sample-prompt { min-height: 340px; }
}
@media (prefers-reduced-motion: reduce) {
  #study circle { transition: none; }
}
.canvas {
  padding-top: 80px;
}
.canvas-body > p {
  max-width: 53ch;
}
.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
  margin: 32px 0;
  gap: 18px;
}
.facts > div {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.fact-value {
  font-size: clamp(36px, 4vw, 60px);
  letter-spacing: -2px;
  line-height: 1;
}
.facts > div > span:last-child {
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 14ch;
}
.boundary {
  font-size: 14px;
  color: var(--muted);
}
.source-link {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink);
  padding: 15px 0;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.closing {
  padding: 70px var(--gutter) 76px;
  background: var(--red);
  color: var(--paper);
}
.closing > p {
  font-size: clamp(30px, 4.8vw, 68px);
  line-height: 1.15;
  letter-spacing: -0.04em;
  max-width: 27ch;
  font-weight: 500;
  margin: 0 0 62px;
}
.pledge {
  display: flex;
  align-items: center;
  gap: 28px;
  border-top: 1px solid #d4a497;
  padding-top: 23px;
}
.pledge .mark {
  color: var(--paper);
}
.pledge p {
  font-size: 14px;
  margin: 0;
  max-width: 45ch;
}
footer {
  padding: 38px var(--gutter) 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}
footer > div:first-child {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
footer strong {
  font-size: 16px;
  letter-spacing: -0.5px;
}
footer span {
  font-size: 12px;
  color: var(--muted);
}
.footer-links {
  display: flex;
  justify-content: flex-end;
  gap: 24px;
  font-size: 12px;
}
.footer-links a {
  align-self: start;
  text-decoration: none;
}
.credits {
  font-size: 10px;
  color: var(--muted);
  max-width: 100ch;
  grid-column: 1/-1;
  margin: 10px 0 0;
  line-height: 1.6;
}
@media (min-width: 1700px) {
  body {
    max-width: 1800px;
    margin: auto;
    border-inline: 1px solid var(--line);
  }
}
@media (max-width: 760px) {
  .mast {
    padding-block: 20px;
  }
  .wordmark {
    font-size: 15px;
    gap: 8px;
  }
  .wordmark .mark {
    font-size: 28px;
  }
  nav {
    gap: 14px;
    font-size: 11px;
  }
  .hero {
    padding-bottom: 52px;
  }
  .hero-meta {
    font-size: 8px;
    letter-spacing: 0.7px;
  }
  .hero h1 {
    margin: 55px 0 34px;
  }
  .hero-bottom {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .study-mark {
    display: none;
  }
  .section {
    grid-template-columns: 1fr;
    gap: 35px;
    padding-block: 44px 55px;
  }
  .section-label h2 {
    font-size: 34px;
    letter-spacing: -1px;
  }
  .section-label > span {
    margin-bottom: 22px;
  }
  .section-label p {
    margin: 0;
  }
  .principle {
    grid-template-columns: 25px 1fr;
    gap: 14px;
    padding-block: 25px;
  }
  .principle h3 {
    font-size: 25px;
  }
  .principle p {
    font-size: 15px;
  }
  .experiment {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-block: 45px;
  }
  .experiment h2 {
    font-size: 30px;
  }
  .control {
    margin-top: 25px;
  }
  .apparatus-caption {
    font-size: 9px;
  }
  .closing {
    padding-block: 45px;
  }
  .closing > p {
    margin-bottom: 36px;
  }
  .pledge {
    gap: 18px;
  }
  footer {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .footer-links {
    justify-content: flex-start;
    flex-wrap: wrap;
  }
  .credits {
    margin: 0;
  }
}
@media (max-width: 380px) {
  nav {
    gap: 12px;
  }
  nav a:nth-child(2) {
    display: none;
  }
  .hero h1 {
    font-size: 43px;
  }
  .hero-meta {
    flex-direction: column;
    gap: 7px;
  }
  .facts {
    gap: 12px;
  }
  .facts > div > span:last-child {
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
@media print {
  .mast nav,
  .experiment,
  .read-link,
  .source-link,
  .footer-links {
    display: none;
  }
  .hero h1 {
    font-size: 52pt;
  }
  .section {
    display: block;
    padding-block: 24px;
  }
  .principle {
    break-inside: avoid;
  }
  .section-label {
    margin-bottom: 30px;
  }
  .closing {
    background: none;
    color: var(--ink);
  }
  body {
    background: white;
  }
  .credits {
    font-size: 9pt;
  }
  footer {
    display: block;
  }
}