:root {
  --paper: #f2f0e9;
  --paper-deep: #e6e5dd;
  --ink: #1e2828;
  --muted: #667271;
  --line: #c8cec8;
  --blue: #527481;
  --blue-deep: #2e5762;
  --red: #b44e3f;
  --green: #637c68;
  --card: #fbfaf6;
  --shadow: rgba(30, 40, 40, 0.08);
  --display: "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --body: Iowan Old Style, Baskerville, "Times New Roman", serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.5;
}

a { color: inherit; }

button, input { font: inherit; }

button { cursor: pointer; }

button:disabled { cursor: not-allowed; opacity: 0.48; }

button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 4px;
}

.wrap { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-180%);
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--line);
  font-family: var(--display);
}

.wordmark, .site-nav a { text-decoration: none; }

.wordmark { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.03em; }

.wordmark-mark, .footer-mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--ink);
  color: var(--blue-deep);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.03em;
}

.site-nav { display: flex; gap: 24px; color: var(--muted); font-size: 0.82rem; }
.site-nav a:hover, .source-links a:hover, .text-link:hover { color: var(--red); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: clamp(40px, 8vw, 120px);
  align-items: center;
  min-height: 650px;
  padding-block: 92px 110px;
}

.eyebrow, .micro-label, .claim-index, .metric-label, .section-kicker, .debrief-rule, .apparatus-caption, .run-counter, .claim-topic, .experiment-status {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow { display: flex; align-items: center; gap: 8px; margin: 0 0 22px; color: var(--blue-deep); }
.eyebrow-dot, .status-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--red); }

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

h1, h2, h3 { font-family: var(--display); font-weight: 700; letter-spacing: -0.06em; line-height: 0.98; }

h1 { max-width: 680px; margin-bottom: 28px; font-size: clamp(3.5rem, 7.4vw, 7.2rem); }
h2 { font-size: clamp(2.4rem, 4.4vw, 4.4rem); }
h3 { font-size: clamp(1.8rem, 3vw, 2.7rem); }

.hero-dek { max-width: 520px; margin-bottom: 34px; font-size: clamp(1.12rem, 1.8vw, 1.42rem); color: var(--muted); }

.hero-actions, .instrument-actions { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid var(--ink);
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.button-dark { background: var(--ink); color: var(--paper); }
.button-dark:hover:not(:disabled) { background: var(--blue-deep); border-color: var(--blue-deep); }
.button-wide { width: 100%; }
.text-link { font-family: var(--display); font-weight: 700; text-underline-offset: 4px; }

.apparatus {
  position: relative;
  min-height: 335px;
  padding: 24px;
  border: 1px solid var(--ink);
  background: var(--card);
  box-shadow: 14px 14px 0 var(--paper-deep);
}

.apparatus-top, .apparatus-caption { display: flex; justify-content: space-between; gap: 16px; }
.apparatus-top { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.micro-label, .apparatus-status { color: var(--muted); }
.apparatus-status { display: flex; align-items: center; gap: 7px; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; }

.tape { position: relative; height: 206px; overflow: hidden; margin-block: 18px; background: #e5ece9; border-block: 1px solid var(--line); }
.tape-line { position: absolute; left: -20%; width: 140%; height: 1px; background: var(--blue); transform: rotate(-8deg); }
.tape-line-a { top: 76px; }
.tape-line-b { top: 132px; background: var(--red); transform: rotate(8deg); }
.tape-window { position: absolute; top: 34px; left: 42%; width: 94px; height: 140px; border: 1px solid var(--ink); background: var(--card); box-shadow: 0 0 0 7px rgba(82, 116, 129, 0.12); }
.tape-window::before, .tape-window::after { content: ""; position: absolute; left: 16px; right: 16px; height: 1px; background: var(--ink); }
.tape-window::before { top: 56px; }
.tape-window::after { top: 76px; background: var(--red); }
.apparatus-caption { color: var(--muted); }
.apparatus-note { margin: 14px 0 0; color: var(--muted); font-size: 0.9rem; }

.start-section, .method-section { padding-block: 110px; border-top: 1px solid var(--line); }
.section-kicker { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 44px; color: var(--blue-deep); }
.section-kicker span:first-child { color: var(--red); }
.start-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr); gap: clamp(40px, 9vw, 130px); align-items: start; }
.start-grid h2 { max-width: 620px; margin-bottom: 26px; }
.start-grid p { max-width: 640px; }
.small-copy { color: var(--muted); font-size: 0.95rem; }

.consent-card { padding: 24px; border: 1px solid var(--ink); background: var(--card); box-shadow: 8px 8px 0 var(--paper-deep); }
.check-row { display: grid; grid-template-columns: 22px 1fr; gap: 12px; align-items: start; font-size: 1rem; }
.check-row input { width: 20px; height: 20px; accent-color: var(--blue-deep); }
.privacy-line { display: flex; gap: 10px; margin: 24px 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.82rem; line-height: 1.4; }
.lock-mark { color: var(--blue-deep); font-family: var(--mono); }
.form-status { min-height: 1.4em; margin: 14px 0 0; color: var(--red); font-family: var(--mono); font-size: 0.72rem; }

.experiment-section { padding-block: 74px 96px; background: var(--paper-deep); border-block: 1px solid var(--line); }
.experiment-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; }
.experiment-head h2 { margin-bottom: 0; font-size: clamp(2.2rem, 5vw, 4.8rem); }
.experiment-head .eyebrow { margin-bottom: 16px; }
.run-counter { display: grid; gap: 5px; min-width: 120px; color: var(--muted); text-align: right; }
.run-counter strong { color: var(--ink); font-size: 0.84rem; font-weight: 400; }
.progress-track, .timer-track { height: 4px; background: var(--line); }
.progress-track { margin: 36px 0 20px; }
.progress-track span, .timer-track span { display: block; height: 100%; width: 0; background: var(--blue-deep); transition: width 240ms ease; }
.experiment-status { min-height: 1.5em; margin-bottom: 38px; color: var(--muted); }
.instrument-view { max-width: 800px; margin-inline: auto; }
.claim-index { margin-bottom: 13px; color: var(--muted); }
.claim-card { display: grid; align-content: center; min-height: 285px; padding: clamp(28px, 5vw, 62px); border: 1px solid var(--ink); background: var(--card); box-shadow: 12px 12px 0 rgba(82, 116, 129, 0.16); }
.claim-card-exposure { border-left: 9px solid var(--blue); }
.claim-card-judgement { border-left: 9px solid var(--red); }
.claim-topic { margin-bottom: 32px; color: var(--blue-deep); }
.claim-text { margin: 0; font-family: var(--display); font-size: clamp(2rem, 4.6vw, 4rem); font-weight: 700; letter-spacing: -0.06em; line-height: 0.98; }
.claim-text:focus { outline: none; }
.instrument-actions { justify-content: space-between; margin-top: 28px; }
.hint-copy { max-width: 420px; margin: 0; color: var(--muted); font-size: 0.92rem; }

.interval-view { max-width: 620px; }
.settling-panel { padding: 42px; border: 1px solid var(--ink); background: var(--card); text-align: center; }
.settling-mark { display: grid; place-items: center; width: 102px; height: 102px; margin: 0 auto 26px; border: 1px solid var(--ink); border-radius: 50%; }
.settling-mark span { width: 20px; height: 20px; border-radius: 50%; background: var(--red); animation: settle-pulse 1.6s ease-in-out infinite; }
.settling-title { margin-bottom: 10px; font-family: var(--display); font-size: 2.1rem; font-weight: 700; letter-spacing: -0.05em; }
.settling-copy { max-width: 420px; margin-inline: auto; color: var(--muted); font-size: 0.98rem; }
.timer-track { max-width: 360px; margin: 30px auto 10px; }
.timer-count { margin: 0; font-family: var(--mono); color: var(--blue-deep); font-size: 0.8rem; letter-spacing: 0.12em; }

.rating-fieldset { margin: 32px 0 0; padding: 0; border: 0; }
.rating-fieldset legend { margin-bottom: 16px; font-family: var(--display); font-size: 1.3rem; font-weight: 700; letter-spacing: -0.03em; }
.rating-scale { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.rating-scale label { position: relative; }
.rating-scale input { position: absolute; opacity: 0; }
.rating-scale span { display: grid; place-items: center; min-height: 58px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-family: var(--display); font-size: 1.2rem; font-weight: 700; }
.rating-scale label:hover span { border-color: var(--blue-deep); }
.rating-scale input:checked + span { border-color: var(--ink); background: var(--blue-deep); color: var(--paper); }
.rating-scale input:focus-visible + span { outline: 3px solid var(--red); outline-offset: 3px; }
.rating-ends { display: flex; justify-content: space-between; gap: 20px; margin-top: 8px; color: var(--muted); font-family: var(--mono); font-size: 0.65rem; text-transform: uppercase; }
.judgement-actions { align-items: end; }
.run-error { max-width: 800px; margin: 28px auto 0; padding: 14px 16px; border: 1px solid var(--red); color: var(--red); font-family: var(--mono); font-size: 0.74rem; }

.results-section { padding-block: 108px; }
.results-intro { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.6fr); gap: 50px; align-items: end; margin-bottom: 48px; }
.results-intro h2 { margin-bottom: 0; }
.results-intro > p:last-child { margin-bottom: 4px; color: var(--muted); }
.metric-grid { display: grid; grid-template-columns: 1.45fr 1fr 1fr; gap: 12px; }
.metric-card { min-height: 190px; padding: 22px; border: 1px solid var(--line); background: var(--card); }
.metric-card-primary { border-color: var(--ink); background: var(--blue-deep); color: var(--paper); }
.metric-label { margin-bottom: 30px; color: var(--muted); }
.metric-card-primary .metric-label { color: #d5e2df; }
.metric-value, .metric-small-value { margin-bottom: 6px; font-family: var(--display); font-weight: 700; letter-spacing: -0.08em; line-height: 0.9; }
.metric-value { font-size: clamp(3.6rem, 8vw, 6.8rem); }
.metric-small-value { font-size: clamp(2.8rem, 5vw, 4.5rem); }
.metric-note { margin: 0; color: var(--muted); font-size: 0.82rem; }
.metric-card-primary .metric-note { color: #d5e2df; }
.debrief-rule { display: grid; grid-template-columns: minmax(140px, 0.85fr) 1fr; gap: 16px; margin: 80px 0 0; padding: 12px 0; border-block: 1px solid var(--ink); color: var(--muted); }
.ledger { border-bottom: 1px solid var(--line); }
.ledger-row { display: grid; grid-template-columns: minmax(160px, 0.85fr) minmax(0, 1.4fr); gap: 30px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.ledger-meta { display: grid; align-content: start; gap: 8px; }
.ledger-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.ledger-badge { padding: 5px 7px; border: 1px solid var(--line); font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; }
.ledger-badge-repeated { border-color: var(--blue-deep); color: var(--blue-deep); }
.ledger-badge-novel { border-color: var(--red); color: var(--red); }
.ledger-badge-true { border-color: var(--green); color: var(--green); }
.ledger-badge-false { border-color: var(--ink); color: var(--ink); }
.ledger-rating { margin: 8px 0 0; font-family: var(--mono); font-size: 0.74rem; color: var(--muted); }
.ledger-text { margin-bottom: 12px; font-family: var(--display); font-size: 1.55rem; font-weight: 700; letter-spacing: -0.04em; line-height: 1.05; }
.ledger-correction { margin-bottom: 9px; color: var(--muted); font-size: 0.94rem; }
.ledger-source { color: var(--blue-deep); font-family: var(--mono); font-size: 0.68rem; text-underline-offset: 3px; }

.aggregate-block { margin-top: 110px; padding: 34px; border: 1px solid var(--ink); background: var(--card); }
.aggregate-heading { display: flex; justify-content: space-between; gap: 30px; align-items: end; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.aggregate-heading h3 { margin: 0; }
.aggregate-heading .eyebrow { margin-bottom: 14px; }
.aggregate-refresh { max-width: 280px; margin: 0; color: var(--muted); font-family: var(--mono); font-size: 0.68rem; text-align: right; }
.aggregate-content { padding-top: 26px; }
.aggregate-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.aggregate-metric { padding: 16px; border-left: 2px solid var(--blue); }
.aggregate-metric strong { display: block; margin-top: 6px; font-family: var(--display); font-size: 2rem; letter-spacing: -0.05em; }
.aggregate-metric span { color: var(--muted); font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.08em; text-transform: uppercase; }
.aggregate-note, .empty-state { color: var(--muted); font-size: 0.92rem; }
.aggregate-note { margin: 24px 0 0; }
.aggregate-table { width: 100%; margin-top: 26px; border-collapse: collapse; font-family: var(--mono); font-size: 0.68rem; }
.aggregate-table th, .aggregate-table td { padding: 10px 8px; border-top: 1px solid var(--line); text-align: left; }
.aggregate-table th { color: var(--muted); font-weight: 400; text-transform: uppercase; }
.empty-state { margin: 0; padding: 20px; border: 1px dashed var(--line); }
.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; }

.method-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.85fr); gap: clamp(50px, 9vw, 130px); }
.method-grid h2 { margin-bottom: 30px; }
.method-grid p { color: var(--muted); }
.note-row { display: grid; grid-template-columns: 32px 1fr; gap: 16px; padding-block: 16px; border-top: 1px solid var(--line); }
.note-number { color: var(--red); font-family: var(--mono); font-size: 0.75rem; }
.note-row strong { font-family: var(--display); font-size: 1.2rem; }
.note-row p { margin: 6px 0 0; font-size: 0.9rem; }
.source-band { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 50px; margin-top: 100px; padding: 28px 0; border-block: 1px solid var(--ink); }
.source-band h3 { margin: 0; }
.source-band .eyebrow { margin-bottom: 14px; }
.source-links { display: grid; gap: 11px; align-content: center; }
.source-links a { color: var(--blue-deep); font-family: var(--mono); font-size: 0.75rem; text-underline-offset: 4px; }
.details-block { margin-top: 32px; border-bottom: 1px solid var(--line); }
.details-block summary { padding: 16px 0; color: var(--blue-deep); cursor: pointer; font-family: var(--display); font-weight: 700; }
.details-block p { max-width: 700px; padding-bottom: 14px; color: var(--muted); font-size: 0.94rem; }

.site-footer { display: flex; justify-content: space-between; gap: 25px; padding-block: 28px 60px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 0.68rem; }
.site-footer > div { display: flex; align-items: center; gap: 10px; }
.site-footer a { color: var(--ink); text-underline-offset: 4px; }
.back-to-top { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); }
.back-to-top.is-enhanced { position: fixed; right: calc(16px + env(safe-area-inset-right, 0px)); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 24; width: 44px; height: 44px; align-items: center; justify-content: center; border: 1px solid var(--ink); background: var(--card); box-shadow: 7px 7px 0 var(--paper-deep); text-decoration: none; opacity: 0; pointer-events: none; transform: translateY(8px); transition: transform 180ms ease; }
.back-to-top.is-enhanced.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top.is-enhanced .back-to-top-label { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.noscript-message { margin-bottom: 40px; padding: 18px; border: 1px solid var(--red); color: var(--red); }

@keyframes settle-pulse { 0%, 100% { transform: scale(0.7); opacity: 0.45; } 50% { transform: scale(1.15); opacity: 1; } }

@media (max-width: 820px) {
  .hero, .start-grid, .method-grid, .source-band, .results-intro { grid-template-columns: 1fr; }
  .hero { min-height: 0; padding-block: 72px 92px; }
  .apparatus { max-width: 560px; }
  .results-intro { gap: 18px; }
  .metric-grid { grid-template-columns: 1fr 1fr; }
  .metric-card-primary { grid-column: 1 / -1; }
  .aggregate-metrics { grid-template-columns: 1fr 1fr; }
  .source-band { gap: 24px; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .wrap { width: min(100% - 32px, 1120px); }
  .site-header { min-height: 64px; }
  .site-nav { gap: 14px; font-size: 0.72rem; }
  .hero { padding-block: 56px 74px; }
  h1 { font-size: clamp(3.1rem, 17vw, 5.3rem); }
  .apparatus { padding: 18px; box-shadow: 7px 7px 0 var(--paper-deep); }
  .tape { height: 170px; }
  .tape-window { left: 37%; height: 112px; top: 28px; }
  .tape-window::before { top: 44px; }
  .tape-window::after { top: 64px; }
  .start-section, .method-section, .results-section { padding-block: 72px; }
  .section-kicker { margin-bottom: 32px; }
  .consent-card { padding: 18px; box-shadow: 5px 5px 0 var(--paper-deep); }
  .experiment-section { padding-block: 46px 64px; }
  .experiment-head { align-items: start; }
  .experiment-head h2 { font-size: 2.7rem; }
  .run-counter { min-width: 75px; }
  .claim-card { min-height: 250px; padding: 28px; box-shadow: 6px 6px 0 rgba(82, 116, 129, 0.16); }
  .claim-text { font-size: clamp(2rem, 10vw, 3.1rem); }
  .instrument-actions { align-items: stretch; }
  .instrument-actions .button { width: 100%; }
  .hint-copy { max-width: none; }
  .settling-panel { padding: 30px 18px; }
  .rating-scale { gap: 4px; }
  .rating-scale span { min-height: 50px; }
  .rating-ends { font-size: 0.58rem; }
  .metric-grid, .aggregate-metrics { grid-template-columns: 1fr; }
  .metric-card-primary { grid-column: auto; }
  .metric-card { min-height: 150px; }
  .debrief-rule { grid-template-columns: 1fr; gap: 6px; }
  .ledger-row { grid-template-columns: 1fr; gap: 18px; }
  .ledger-text { font-size: 1.35rem; }
  .aggregate-block { margin-top: 72px; padding: 20px; }
  .aggregate-heading { display: block; }
  .aggregate-refresh { margin-top: 16px; text-align: left; }
  .aggregate-table { font-size: 0.6rem; }
  .site-footer { display: grid; gap: 16px; padding-bottom: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}