:root {
  --paper: #f3f0e8;
  --paper-bright: #fcfbf7;
  --graphite: #181818;
  --graphite-soft: #4b4a46;
  --rule: #bdb9ae;
  --rule-dark: #4e4e4e;
  --cobalt: #2457ff;
  --cobalt-dark: #173bc0;
  --apricot: #ff9b73;
  --verified: #17855b;
  --question: #a05c00;
  --stop: #bc2f2f;
  --sans: "Aptos", "Segoe UI Variable", "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --page-gutter: clamp(1.25rem, 4vw, 4.5rem);
  --max-width: 92rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  color: var(--graphite);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--paper-bright);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--graphite);
}

input:focus-visible + span {
  outline: 3px solid var(--graphite);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  color: var(--paper-bright);
  background: var(--graphite);
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

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

.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;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 4.5rem;
  padding: 0 var(--page-gutter);
  border-bottom: 1px solid var(--graphite);
  background: var(--paper);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand > span:first-child {
  display: grid;
  place-items: center;
  width: 2.25rem;
  aspect-ratio: 1;
  color: var(--paper-bright);
  background: var(--graphite);
  font-size: 0.66rem;
  letter-spacing: 0;
}

.site-header nav {
  display: flex;
  justify-content: center;
  gap: clamp(1rem, 2.6vw, 2.5rem);
}

.site-header nav a,
.header-download {
  font-size: 0.76rem;
  font-weight: 700;
  text-decoration: none;
}

.site-header nav a[aria-current="location"] {
  text-decoration: underline;
  text-decoration-color: var(--cobalt);
  text-decoration-thickness: 3px;
}

.header-download {
  padding-bottom: 0.15rem;
  border-bottom: 1px solid var(--graphite);
}

.challenge {
  display: grid;
  grid-template-columns: minmax(0, 1.14fr) minmax(25rem, 0.86fr);
  min-height: calc(100svh - 4.5rem);
  border-bottom: 1px solid var(--graphite);
}

.challenge-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(4rem, 8vh, 7rem) var(--page-gutter);
  animation: opening-copy 600ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.kicker,
.section-number,
.dossier-label,
.boundary-note {
  margin: 0;
  font-size: 0.69rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.kicker {
  color: var(--cobalt-dark);
}

.product-name {
  margin: clamp(2.2rem, 6vh, 5rem) 0 1rem;
  color: var(--cobalt);
  font-size: clamp(1rem, 1.8vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.challenge h1 {
  max-width: 12ch;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.2rem, 6.3vw, 7.2rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.92;
}

.challenge-deck {
  max-width: 39rem;
  margin: clamp(1.5rem, 4vh, 2.5rem) 0 0;
  color: var(--graphite-soft);
  font-size: clamp(1.05rem, 1.6vw, 1.38rem);
  line-height: 1.45;
}

.challenge-boundary {
  max-width: 42rem;
  margin: 1.15rem 0 0;
  padding-left: 0.8rem;
  border-left: 3px solid var(--cobalt);
  color: var(--graphite-soft);
  font-size: 0.74rem;
  line-height: 1.45;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  min-height: 3.3rem;
  margin-top: 2.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--graphite);
  color: var(--paper-bright);
  background: var(--graphite);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.primary-action:hover {
  color: var(--graphite);
  background: transparent;
  transform: translateY(-2px);
}

.source-dossier {
  position: relative;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin: 0;
  padding: clamp(3rem, 8vw, 7.5rem) clamp(2rem, 5vw, 5rem);
  color: var(--paper-bright);
  background: var(--cobalt);
  animation: opening-dossier 700ms 100ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.source-dossier::before {
  content: "→";
  position: absolute;
  top: 50%;
  left: 0;
  display: grid;
  place-items: center;
  width: 4.75rem;
  aspect-ratio: 1;
  color: var(--graphite);
  background: var(--apricot);
  font-family: var(--serif);
  font-size: 2.2rem;
  transform: translate(-50%, -50%);
}

.dossier-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: clamp(3rem, 7vh, 6rem);
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.65);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.dossier-header p {
  margin: 0;
}

.dossier-header span {
  padding: 0.15rem 0.4rem;
  color: var(--cobalt);
  background: var(--paper-bright);
}

.dossier-label {
  color: rgba(255, 255, 255, 0.72);
}

.source-dossier h2 {
  max-width: 13ch;
  margin: 0.75rem 0 1.25rem;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 4.2vw, 5rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.dossier-question {
  max-width: 34rem;
  margin: 0;
  font-size: 1.05rem;
}

.source-dossier dl {
  margin: 2.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.45);
}

.source-dossier dl div {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
}

.source-dossier dt {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-dossier dd {
  margin: 0;
  font-size: 0.9rem;
}

.source-dossier > a {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 800;
}

.independence {
  display: grid;
  grid-template-columns: minmax(6rem, 0.25fr) minmax(0, 1.75fr);
  gap: 2rem;
  padding: 1.25rem var(--page-gutter);
  color: var(--paper-bright);
  background: var(--graphite);
}

.independence span {
  color: var(--apricot);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.independence p {
  max-width: 80rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.78rem;
}

.lab-section,
.demonstration,
.ledger-section,
.comparison,
.protocol,
.evidence,
.closing,
.sources {
  padding: clamp(5.5rem, 10vw, 10rem) var(--page-gutter);
}

.lab-heading,
.demonstration > header,
.ledger-section > header,
.comparison > header,
.protocol > header,
.evidence > header {
  display: grid;
  grid-template-columns: minmax(8rem, 0.35fr) minmax(20rem, 0.95fr) minmax(16rem, 0.7fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  max-width: var(--max-width);
  margin: 0 auto clamp(3rem, 7vw, 6rem);
}

.section-number {
  color: var(--cobalt-dark);
}

.lab-heading h2,
.demonstration h2,
.ledger-section h2,
.comparison h2,
.protocol h2,
.evidence h2,
.closing h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.6rem, 5.2vw, 6rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.95;
}

.lab-heading > p:last-child,
.demonstration > header > p:last-child,
.ledger-section > header > p:last-child,
.evidence > header > p:last-child {
  margin: 0;
  color: var(--graphite-soft);
  font-size: 1rem;
}

.lab-workspace {
  display: grid;
  grid-template-columns: minmax(18rem, 0.72fr) minmax(0, 1.28fr);
  align-items: start;
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--graphite);
  border-bottom: 1px solid var(--graphite);
}

.lab-controls {
  position: sticky;
  top: 5.5rem;
  min-width: 0;
  align-self: start;
  padding: 2rem clamp(1.25rem, 3vw, 3rem) 3rem 0;
}

.source-fixed {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 2.5rem;
  padding: 1rem 0 1.2rem 1rem;
  border-left: 4px solid var(--cobalt);
}

.source-fixed span,
.source-fixed small {
  color: var(--graphite-soft);
  font-size: 0.67rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-fixed strong {
  font-family: var(--serif);
  font-size: 1.28rem;
  font-weight: 500;
}

.lab-controls fieldset {
  min-width: 0;
  margin: 0;
  padding: 1.5rem 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

.lab-controls fieldset:last-child {
  border-bottom: 1px solid var(--rule);
}

.lab-controls legend {
  width: 100%;
  margin: 0 0 0.8rem;
  padding: 0;
  color: var(--graphite-soft);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lab-controls legend span {
  display: inline-block;
  width: 2rem;
  color: var(--cobalt);
}

.lab-controls label {
  position: relative;
  display: block;
  cursor: pointer;
}

.lab-controls input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0.001;
  accent-color: var(--cobalt);
}

.lab-controls label > span {
  display: flex;
  align-items: center;
  min-height: 2.7rem;
  padding: 0.45rem 2.2rem 0.45rem 0;
  border-bottom: 1px solid transparent;
  color: var(--graphite-soft);
  font-size: 0.9rem;
  transition: color 140ms ease, padding 140ms ease, border-color 140ms ease;
}

.lab-controls label > span::after {
  content: "";
  position: absolute;
  right: 0.2rem;
  width: 0.7rem;
  aspect-ratio: 1;
  border: 1px solid var(--graphite);
  border-radius: 50%;
  background: transparent;
}

.lab-controls input:checked + span {
  padding-left: 0.65rem;
  border-color: var(--graphite);
  color: var(--graphite);
  font-weight: 800;
}

.lab-controls input:checked + span::after {
  border-color: var(--cobalt);
  background: var(--cobalt);
  box-shadow: inset 0 0 0 2px var(--paper);
}

.story-result {
  min-width: 0;
  margin: 0;
  padding: clamp(2rem, 4vw, 4rem);
  color: var(--paper-bright);
  background: var(--graphite);
}

.story-result.is-updating {
  animation: result-update 380ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.result-topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 3.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule-dark);
}

.result-topline p {
  margin: 0;
}

.result-topline > div > p {
  color: var(--apricot);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.result-topline h3 {
  margin: 0.4rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 4.2rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1;
}

.selection-summary {
  max-width: 18rem;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.7rem;
  text-align: right;
}

.selection-summary span:nth-child(odd) {
  color: var(--paper-bright);
}

.result-sequence {
  counter-reset: result-step;
}

.result-sequence section {
  display: grid;
  grid-template-columns: minmax(8rem, 0.32fr) minmax(0, 1fr);
  gap: 2rem;
  padding: 1.55rem 0;
  border-top: 1px solid var(--rule-dark);
}

.result-sequence section > p:last-child {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.65vw, 1.45rem);
  line-height: 1.42;
}

.result-label {
  margin: 0;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-label span {
  display: inline-block;
  width: 1.7rem;
  color: var(--apricot);
}

.verified-label {
  color: #63d6a8;
}

.question-label {
  color: #f2bd6c;
}

.decision-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 2rem 0;
  background: var(--rule-dark);
}

.decision-footer > div {
  min-width: 0;
  padding: 1.25rem;
  background: #232323;
}

.decision-footer p {
  margin: 0;
}

.decision-footer p:first-child {
  margin-bottom: 0.5rem;
  color: var(--apricot);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.decision-footer p:last-child {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.82rem;
}

.evidence-note {
  margin: 0;
  padding: 1rem 0 0 1rem;
  border-left: 3px solid var(--cobalt);
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.76rem;
}

.noscript-note {
  max-width: var(--max-width);
  margin: 1rem auto 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--question);
  color: var(--question);
  font-size: 0.8rem;
}

.demonstration {
  border-top: 1px solid var(--graphite);
  background: var(--paper-bright);
}

.demonstration > header {
  grid-template-columns: minmax(8rem, 0.35fr) minmax(20rem, 0.95fr) minmax(16rem, 0.7fr);
}

.demonstration > header .boundary-note {
  grid-column: 2;
  color: var(--stop);
}

.demonstration h2 {
  grid-column: 2;
}

.demonstration > header > p:last-child {
  grid-column: 3;
  grid-row: 2;
}

.storyboard-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 0.55fr);
  gap: clamp(2rem, 6vw, 7rem);
  max-width: var(--max-width);
  margin: 0 auto;
}

.storyboard {
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--graphite);
}

.storyboard li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(5rem, 0.2fr) minmax(0, 0.8fr);
  gap: 2rem;
  min-height: 7rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.storyboard li::before {
  content: "";
  position: absolute;
  top: -0.38rem;
  left: 0;
  width: 0.72rem;
  aspect-ratio: 1;
  background: var(--cobalt);
  border-radius: 50%;
}

.storyboard span {
  color: var(--cobalt-dark);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.storyboard p {
  max-width: 44rem;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1rem, 1.55vw, 1.3rem);
}

.format-notes {
  border-top: 2px solid var(--graphite);
}

.format-notes div {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.format-notes span {
  color: var(--cobalt-dark);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.format-notes p {
  margin: 0.5rem 0 0;
  color: var(--graphite-soft);
  font-size: 0.84rem;
}

.ledger-section {
  color: var(--paper-bright);
  background: var(--graphite);
}

.ledger-section .section-number {
  color: var(--apricot);
}

.ledger-section > header > p:last-child {
  color: rgba(255, 255, 255, 0.65);
}

.ledger {
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--rule-dark);
}

.ledger article {
  display: grid;
  grid-template-columns: minmax(9rem, 0.3fr) minmax(15rem, 0.55fr) minmax(20rem, 1.15fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule-dark);
}

.ledger article > p:first-child {
  margin: 0;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ledger article > p:first-child span {
  display: inline-block;
  width: 1.4rem;
}

.ledger article h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.2vw, 2rem);
  font-weight: 500;
}

.ledger article > p:last-child {
  margin: 0;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.9rem;
}

.ledger [data-status="verified"] > p:first-child {
  color: #63d6a8;
}

.ledger [data-status="inference"] > p:first-child {
  color: var(--apricot);
}

.ledger [data-status="question"] > p:first-child {
  color: #f2bd6c;
}

.ledger [data-status="stop"] > p:first-child {
  color: #ff7f7f;
}

.comparison {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(3rem, 8vw, 10rem);
  border-bottom: 1px solid var(--graphite);
  background: var(--apricot);
}

.comparison > header {
  display: block;
  margin: 0;
}

.comparison h2 {
  max-width: 9ch;
  margin-top: 1.5rem;
}

.comparison-lines {
  border-top: 2px solid var(--graphite);
}

.comparison-lines p {
  display: grid;
  grid-template-columns: minmax(9rem, 0.38fr) minmax(0, 0.62fr);
  gap: 2rem;
  margin: 0;
  padding: 1.35rem 0;
  border-bottom: 1px solid rgba(24, 24, 24, 0.4);
}

.comparison-lines span {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comparison-lines strong {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 1.8vw, 1.5rem);
  font-weight: 500;
}

.protocol {
  background: var(--paper);
}

.protocol > header {
  grid-template-columns: minmax(8rem, 0.35fr) minmax(0, 1.65fr);
}

.protocol ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--graphite);
}

.protocol li {
  min-width: 0;
  min-height: 21rem;
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-right: 1px solid var(--rule);
}

.protocol li + li {
  padding-left: 1.5rem;
}

.protocol li:last-child {
  border-right: 0;
}

.protocol li > span {
  color: var(--cobalt-dark);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.protocol h3 {
  margin: 3rem 0 0.8rem;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 500;
  line-height: 1;
}

.protocol li p {
  color: var(--graphite-soft);
  font-size: 0.86rem;
}

.protocol li strong {
  display: block;
  margin-top: 2rem;
  font-size: 0.8rem;
}

.evidence {
  border-top: 1px solid var(--graphite);
  background: var(--paper-bright);
}

.evidence-lines {
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 2px solid var(--graphite);
}

.evidence-lines article {
  display: grid;
  grid-template-columns: minmax(7rem, 0.2fr) minmax(15rem, 0.5fr) minmax(20rem, 1.3fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  padding: 1.55rem 0;
  border-bottom: 1px solid var(--rule);
}

.evidence-lines span {
  color: var(--cobalt-dark);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.evidence-lines h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.9rem);
  font-weight: 500;
}

.evidence-lines p {
  margin: 0;
  color: var(--graphite-soft);
  font-size: 0.9rem;
}

.closing {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(18rem, 0.8fr);
  gap: clamp(3rem, 9vw, 10rem);
  color: var(--paper-bright);
  background: var(--cobalt);
}

.closing .section-number {
  color: rgba(255, 255, 255, 0.75);
}

.closing h2 {
  max-width: 12ch;
  margin-top: 1rem;
}

.closing > div > p:last-child {
  max-width: 42rem;
  color: rgba(255, 255, 255, 0.78);
}

.closing-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1.2rem;
}

.closing-actions > a:not(.primary-action) {
  font-size: 0.82rem;
  font-weight: 800;
}

.dark-action {
  margin-top: 0;
}

.dark-action:hover {
  border-color: var(--paper-bright);
  color: var(--paper-bright);
}

.sources {
  display: grid;
  grid-template-columns: minmax(10rem, 0.4fr) minmax(20rem, 1.1fr) minmax(14rem, 0.5fr);
  gap: clamp(2rem, 6vw, 7rem);
  border-bottom: 1px solid var(--graphite);
}

.sources h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 500;
}

.sources ol {
  margin: 0;
  padding-left: 1.1rem;
}

.sources li {
  margin-bottom: 0.6rem;
  font-size: 0.78rem;
}

.sources > p {
  margin: 0;
  color: var(--graphite-soft);
  font-size: 0.78rem;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.5rem var(--page-gutter);
  color: var(--paper-bright);
  background: var(--graphite);
  font-size: 0.7rem;
}

footer p {
  margin: 0;
}

@keyframes opening-copy {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes opening-dossier {
  from {
    opacity: 0;
    transform: translateX(1.5rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes result-update {
  0% {
    box-shadow: inset 0 0 0 0 var(--cobalt);
  }
  45% {
    box-shadow: inset 0.35rem 0 0 0 var(--cobalt);
  }
  100% {
    box-shadow: inset 0 0 0 0 var(--cobalt);
  }
}

@media (max-width: 1100px) {
  .challenge {
    grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.86fr);
  }

  .challenge h1 {
    font-size: clamp(3rem, 6vw, 5rem);
  }

  .lab-heading,
  .demonstration > header,
  .ledger-section > header,
  .protocol > header,
  .evidence > header {
    grid-template-columns: minmax(7rem, 0.3fr) minmax(0, 1.1fr) minmax(14rem, 0.6fr);
    gap: 2rem;
  }

  .lab-workspace {
    grid-template-columns: minmax(17rem, 0.62fr) minmax(0, 1.38fr);
  }

  .result-sequence section {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 1.3rem;
  }

  .storyboard-shell {
    grid-template-columns: minmax(0, 1.2fr) minmax(16rem, 0.8fr);
    gap: 3rem;
  }
}

@media (max-width: 820px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .challenge {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .challenge-copy {
    min-height: calc(78svh - 4.5rem);
  }

  .source-dossier {
    padding: 4.5rem var(--page-gutter);
  }

  .source-dossier::before {
    top: 0;
    left: var(--page-gutter);
    transform: translateY(-50%) rotate(90deg);
  }

  .dossier-header {
    margin-bottom: 3rem;
  }

  .lab-heading,
  .demonstration > header,
  .ledger-section > header,
  .protocol > header,
  .evidence > header {
    grid-template-columns: 1fr 2.2fr;
  }

  .lab-heading > p:last-child,
  .ledger-section > header > p:last-child,
  .evidence > header > p:last-child {
    grid-column: 2;
  }

  .lab-workspace {
    grid-template-columns: 1fr;
  }

  .lab-controls {
    position: static;
    padding-right: 0;
  }

  .story-result {
    margin-inline: calc(-1 * var(--page-gutter));
  }

  .demonstration > header .boundary-note,
  .demonstration h2 {
    grid-column: 2;
  }

  .demonstration > header > p:last-child {
    grid-column: 2;
    grid-row: auto;
  }

  .storyboard-shell {
    grid-template-columns: 1fr;
  }

  .ledger article,
  .evidence-lines article {
    grid-template-columns: 7rem minmax(12rem, 0.7fr) minmax(0, 1.3fr);
    gap: 1.2rem;
  }

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

  .comparison h2 {
    max-width: 12ch;
  }

  .protocol ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .protocol li:nth-child(2) {
    border-right: 0;
  }

  .protocol li {
    min-height: 18rem;
    border-bottom: 1px solid var(--rule);
  }

  .closing,
  .sources {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --page-gutter: 1.2rem;
  }

  .site-header {
    min-height: 4rem;
  }

  .brand > span:last-child {
    display: none;
  }

  .header-download {
    font-size: 0.7rem;
  }

  .challenge-copy {
    min-height: calc(80svh - 4rem);
    padding-top: 3rem;
    padding-bottom: 4rem;
  }

  .product-name {
    margin-top: 3rem;
  }

  .challenge h1 {
    font-size: clamp(2.9rem, 14.2vw, 4.4rem);
  }

  .challenge-deck {
    font-size: 1rem;
  }

  .source-dossier h2 {
    font-size: 2.65rem;
  }

  .source-dossier dl div {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .independence {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .lab-section,
  .demonstration,
  .ledger-section,
  .comparison,
  .protocol,
  .evidence,
  .closing,
  .sources {
    padding-top: 4.5rem;
    padding-bottom: 4.5rem;
  }

  .lab-heading,
  .demonstration > header,
  .ledger-section > header,
  .protocol > header,
  .evidence > header {
    grid-template-columns: 1fr;
    margin-bottom: 2.5rem;
  }

  .lab-heading > p:last-child,
  .ledger-section > header > p:last-child,
  .evidence > header > p:last-child,
  .demonstration > header .boundary-note,
  .demonstration h2,
  .demonstration > header > p:last-child {
    grid-column: 1;
  }

  .lab-heading h2,
  .demonstration h2,
  .ledger-section h2,
  .comparison h2,
  .protocol h2,
  .evidence h2,
  .closing h2 {
    font-size: clamp(2.55rem, 12.5vw, 4.2rem);
  }

  .lab-controls {
    padding-top: 1rem;
  }

  .story-result {
    margin-inline: calc(-1 * var(--page-gutter));
    padding: 2.2rem var(--page-gutter) 2.5rem;
  }

  .result-topline {
    position: sticky;
    z-index: 4;
    top: 4rem;
    display: block;
    margin: -2.2rem calc(-1 * var(--page-gutter)) 2.5rem;
    padding: 0.9rem var(--page-gutter);
    border-bottom: 1px solid var(--rule-dark);
    background: var(--graphite);
  }

  .result-topline > div {
    display: none;
  }

  .selection-summary {
    max-width: none;
    margin-top: 0 !important;
    text-align: left;
  }

  .result-sequence section {
    grid-template-columns: 1fr;
    gap: 0.55rem;
    padding: 1.3rem 0;
  }

  .decision-footer {
    grid-template-columns: 1fr;
  }

  .storyboard li {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    gap: 1rem;
  }

  .ledger article,
  .evidence-lines article {
    grid-template-columns: 1fr;
    gap: 0.55rem;
    padding: 1.45rem 0;
  }

  .comparison-lines p {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .protocol ol {
    grid-template-columns: 1fr;
  }

  .protocol li,
  .protocol li + li {
    min-height: 0;
    padding: 1.4rem 0 2rem;
    border-right: 0;
  }

  .protocol h3 {
    margin-top: 1.2rem;
  }

  .protocol li strong {
    margin-top: 1rem;
  }

  .closing-actions {
    align-items: stretch;
  }

  .closing-actions .primary-action {
    width: 100%;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
  }
}

@media (max-width: 340px) {
  .challenge h1 {
    font-size: 2.7rem;
  }

  .primary-action {
    width: 100%;
    gap: 1rem;
  }

  .source-dossier {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .challenge-copy,
  .source-dossier,
  .story-result.is-updating {
    animation: none;
  }
}