:root {
  --paper: #ebe7dc;
  --paper-light: #f5f2e9;
  --ink: #171713;
  --muted: #6f6b60;
  --rule: rgba(23, 23, 19, 0.22);
  --rule-strong: rgba(23, 23, 19, 0.62);
  --signal: #e4482d;
  --signal-dark: #a82b1b;
  --specimen: #b8a296;
  --specimen-dark: #705b55;
  --blueprint: #306b75;
  --content: 1480px;
  --gutter: clamp(20px, 4vw, 72px);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, Helvetica, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent calc(var(--gutter) - 1px), rgba(23,23,19,.08) var(--gutter), transparent calc(var(--gutter) + 1px)),
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}
::selection { color: var(--paper-light); background: var(--ink); }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
code, pre { font-family: var(--mono); }

.skip-link {
  position: fixed;
  z-index: 100;
  left: 12px;
  top: 12px;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: 64px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 28px;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--rule-strong);
  background: rgba(235, 231, 220, 0.94);
  backdrop-filter: blur(8px);
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  font-weight: 700;
  letter-spacing: -0.04em;
}
.wordmark-mark {
  width: 19px;
  height: 19px;
  display: inline-block;
  border: 1px solid var(--ink);
  background: repeating-linear-gradient(135deg, transparent 0 3px, var(--ink) 3px 4px);
}
.header-status {
  justify-self: center;
  font: 10px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}
.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--signal);
  animation: status-pulse 2.4s steps(2, end) infinite;
}
@keyframes status-pulse { 50% { opacity: .25; } }
.site-nav {
  justify-self: end;
  display: flex;
  gap: 22px;
  font: 11px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.site-nav a { border-bottom: 1px solid transparent; padding: 4px 0; }
.site-nav a:hover, .site-nav a:focus-visible { border-bottom-color: currentColor; }
.menu-button { display: none; }

.hero {
  position: relative;
  width: min(100%, var(--content));
  min-height: calc(100vh - 64px);
  margin: 0 auto;
  padding: clamp(72px, 9vw, 140px) var(--gutter) 56px;
  display: grid;
  grid-template-columns: minmax(0, 0.93fr) minmax(430px, 1.07fr);
  gap: clamp(46px, 7vw, 110px);
  align-items: center;
  border-bottom: 1px solid var(--rule-strong);
}
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 47%;
  border-left: 1px solid var(--rule);
  pointer-events: none;
}
.hero-index {
  position: absolute;
  top: 24px;
  left: var(--gutter);
  font: 10px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.eyebrow, .section-kicker {
  margin: 0 0 22px;
  font: 11px/1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: .09em;
}
.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(62px, 8.2vw, 132px);
  line-height: .82;
  letter-spacing: -0.07em;
}
.hero h1 span, .hero h1 em { display: block; }
.hero h1 em {
  margin-top: .12em;
  color: var(--signal);
  font-weight: 400;
  transform: translateX(clamp(16px, 4vw, 64px));
}
.hero-intro {
  max-width: 610px;
  margin: clamp(34px, 5vw, 74px) 0 0;
  font-family: var(--serif);
  font-size: clamp(21px, 2vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.025em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 38px; }
.text-action {
  display: inline-flex;
  align-items: baseline;
  gap: 18px;
  padding: 8px 0 5px;
  border-bottom: 1px solid currentColor;
  font: 11px/1 var(--mono);
  letter-spacing: .05em;
  text-transform: uppercase;
}
.text-action span { transition: transform .2s ease; }
.text-action:hover span { transform: translate(3px, -2px); }
.text-action.inverse { color: var(--paper-light); }

.boundary-study { margin: 0; position: relative; min-width: 0; }
.study-meta {
  display: flex;
  justify-content: space-between;
  padding-bottom: 9px;
  font: 9px/1 var(--mono);
  letter-spacing: .08em;
}
.study-svg { width: 100%; height: auto; display: block; overflow: visible; color: var(--ink); }
.study-paper { fill: var(--paper-light); }
.study-frame { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.study-grid { color: var(--blueprint); }
.registration-marks path { fill: none; stroke: var(--ink); stroke-width: 1; }
.specimen-fill > rect { fill: var(--specimen); opacity: .68; }
.specimen-band { fill: none; stroke-width: 86; opacity: .2; }
.specimen-band-a { stroke: var(--signal-dark); }
.specimen-band-b { stroke: var(--blueprint); }
.specimen-speckles circle { fill: var(--ink); opacity: .13; }
.contour, .consensus {
  fill: none;
  vector-effect: non-scaling-stroke;
  transition: opacity .32s ease, stroke-width .32s ease, stroke-dashoffset .8s ease;
}
.contour { stroke-width: 1.35; stroke-dasharray: 7 5; opacity: .62; }
.contour-a { stroke: var(--ink); }
.contour-b { stroke: var(--signal); stroke-dashoffset: 7; }
.contour-c { stroke: var(--blueprint); stroke-dashoffset: 14; }
.contour-d { stroke: var(--signal-dark); stroke-dashoffset: 21; }
.consensus { stroke: var(--ink); stroke-width: 3; opacity: .95; }
.boundary-study[data-gate="1"] .consensus { opacity: .25; stroke-width: 1.2; }
.boundary-study[data-gate="1"] .contour { opacity: .95; }
.boundary-study[data-gate="2"] .consensus { opacity: .48; stroke-width: 1.8; }
.boundary-study[data-gate="2"] .contour { opacity: .8; }
.boundary-study[data-gate="3"] .consensus { opacity: .85; stroke-width: 2.7; }
.boundary-study[data-gate="3"] .contour { opacity: .48; }
.boundary-study[data-gate="4"] .consensus { opacity: 1; stroke-width: 4; }
.boundary-study[data-gate="4"] .contour { opacity: .18; }
.study-labels { font: 9px var(--mono); letter-spacing: .08em; fill: var(--ink); }
.study-labels path { stroke: var(--ink); stroke-width: 2; }
.study-controls {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 8px 18px;
  padding-top: 16px;
}
.study-controls > div:first-child { display: flex; justify-content: space-between; gap: 12px; }
.control-label, .study-controls output, .control-scale {
  font: 9px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: .07em;
}
.study-controls input { grid-column: 2; width: 100%; accent-color: var(--ink); }
.control-scale { grid-column: 2; display: flex; justify-content: space-between; color: var(--muted); }
.hero-note {
  position: absolute;
  bottom: 26px;
  left: var(--gutter);
  width: 190px;
  display: flex;
  align-items: start;
  gap: 12px;
  font: 9px/1.35 var(--mono);
  text-transform: uppercase;
}
.hero-note p { margin: 0; }
.note-number { font-size: 19px; color: var(--signal); }

.statement {
  padding: clamp(80px, 11vw, 180px) var(--gutter);
  border-bottom: 1px solid var(--rule-strong);
  overflow: hidden;
}
.statement p {
  max-width: 1300px;
  margin: 0 auto;
  font-family: var(--serif);
  font-size: clamp(42px, 7vw, 112px);
  line-height: .94;
  letter-spacing: -0.065em;
}
.statement span { text-decoration: line-through; text-decoration-thickness: .05em; color: var(--muted); }

.section-grid {
  width: min(100%, var(--content));
  margin: 0 auto;
  padding: clamp(88px, 10vw, 160px) var(--gutter);
  display: grid;
  grid-template-columns: minmax(250px, .65fr) minmax(0, 1.35fr);
  gap: clamp(54px, 9vw, 150px);
  border-bottom: 1px solid var(--rule-strong);
}
.section-heading { position: relative; }
.section-number {
  display: inline-block;
  min-width: 36px;
  margin-bottom: 44px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--signal);
  font: 11px/1 var(--mono);
}
.section-heading h2, .manuscript h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 5.2vw, 82px);
  font-weight: 400;
  line-height: .98;
  letter-spacing: -0.055em;
}
.section-heading > p:last-child {
  max-width: 520px;
  margin: 32px 0 0;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.35;
}

.apparatus { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.apparatus li {
  position: relative;
  display: grid;
  grid-template-columns: .5fr 1fr;
  gap: 20px 40px;
  min-height: 150px;
  padding: 28px 54px 28px 0;
  border-bottom: 1px solid var(--rule-strong);
}
.apparatus li::after {
  content: attr(data-step);
  position: absolute;
  top: 28px;
  right: 0;
  font: 10px/1 var(--mono);
  color: var(--muted);
}
.apparatus-name {
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1;
}
.apparatus p { margin: 4px 0 0; max-width: 520px; }
.apparatus code { grid-column: 2; color: var(--signal-dark); font-size: 12px; }

.methods { background: var(--paper-light); }
.method-register { min-width: 0; }
.method-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.method-tabs button {
  appearance: none;
  border: 0;
  border-right: 1px solid var(--rule-strong);
  padding: 15px 14px;
  text-align: left;
  background: transparent;
  font: 11px/1 var(--mono);
  text-transform: uppercase;
  cursor: pointer;
}
.method-tabs button:last-child { border-right: 0; }
.method-tabs button span { float: right; color: var(--muted); }
.method-tabs button[aria-selected="true"] { color: var(--paper-light); background: var(--ink); }
.method-list { min-height: 690px; }
.method-row {
  display: grid;
  grid-template-columns: 58px minmax(180px, 1fr) minmax(180px, .8fr) 28px;
  gap: 18px;
  align-items: center;
  min-height: 62px;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  transition: background .15s ease;
}
.method-row:hover, .method-row:focus-within { background: rgba(23,23,19,.045); }
.method-index { padding-left: 8px; font: 10px/1 var(--mono); color: var(--muted); }
.method-name { font-family: var(--serif); font-size: clamp(18px, 2vw, 25px); letter-spacing: -.02em; }
.method-family { font: 10px/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.method-toggle {
  width: 28px;
  height: 28px;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 20px;
  transition: transform .2s ease;
}
.method-row[aria-expanded="true"] .method-toggle { transform: rotate(45deg); }
.method-detail {
  grid-column: 2 / -1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px 30px;
  max-height: 0;
  overflow: hidden;
  padding-right: 12px;
  transition: max-height .35s ease, padding .35s ease;
}
.method-row[aria-expanded="true"] .method-detail { max-height: 180px; padding-bottom: 24px; }
.method-detail p { margin: 0; max-width: 570px; font-size: 14px; }
.method-detail code { align-self: start; font-size: 11px; color: var(--signal-dark); }
.method-footnote { display: flex; justify-content: space-between; gap: 24px; padding-top: 14px; font: 9px/1.4 var(--mono); color: var(--muted); text-transform: uppercase; }

.metric-selector {
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}
.metric-selector button {
  border: 0;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 13px 16px;
  background: transparent;
  font: 10px/1 var(--mono);
  text-transform: uppercase;
  cursor: pointer;
}
.metric-selector button[aria-selected="true"] { background: var(--signal); color: white; }
.metric-display {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  min-height: 440px;
  border-bottom: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
  border-right: 1px solid var(--ink);
}
.metric-diagram { display: grid; place-items: center; min-width: 0; border-right: 1px solid var(--ink); }
.metric-diagram svg { width: 100%; height: auto; }
.metric-ground, .metric-prediction { fill: none; vector-effect: non-scaling-stroke; }
.metric-ground { stroke: var(--ink); stroke-width: 2; stroke-dasharray: 6 5; }
.metric-prediction { stroke: var(--signal); stroke-width: 3; transition: d .4s ease; }
.metric-measure { fill: none; stroke: var(--blueprint); stroke-width: 1.5; stroke-dasharray: 3 4; }
.metric-diagram text { font: 9px var(--mono); fill: var(--muted); text-transform: uppercase; }
.metric-ground-label { fill: var(--ink) !important; }
.metric-prediction-label { fill: var(--signal-dark) !important; }
.metric-hatch line { stroke: var(--signal); stroke-width: .8; opacity: .55; }
.metric-copy { padding: clamp(30px, 4vw, 60px); display: flex; flex-direction: column; justify-content: flex-end; }
.metric-code { font: 10px/1 var(--mono); color: var(--signal-dark); }
.metric-copy h3 { margin: 14px 0 18px; font-family: var(--serif); font-size: clamp(38px, 4vw, 62px); font-weight: 400; line-height: 1; }
.metric-copy p { margin: 0 0 26px; }
.metric-copy code { font-size: 11px; }

.manuscript {
  position: relative;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) minmax(380px, .85fr);
  gap: clamp(40px, 7vw, 110px);
  padding: clamp(92px, 11vw, 170px) var(--gutter);
  color: var(--paper-light);
  background: var(--ink);
  overflow: hidden;
}
.manuscript::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .1;
  background-image: repeating-linear-gradient(0deg, transparent 0 29px, var(--paper-light) 30px);
  pointer-events: none;
}
.manuscript > * { position: relative; z-index: 1; }
.manuscript-margin { writing-mode: vertical-rl; font: 10px/1 var(--mono); letter-spacing: .22em; color: var(--signal); text-transform: uppercase; }
.manuscript-copy p:not(.section-kicker) { max-width: 650px; margin: 34px 0; font-family: var(--serif); font-size: 20px; line-height: 1.4; }
.vault { display: flex; flex-direction: column; justify-content: space-between; gap: 44px; border: 1px solid rgba(245,242,233,.6); padding: clamp(28px, 4vw, 50px); }
.vault-stamp {
  width: 190px;
  height: 190px;
  margin: 0 auto;
  border: 2px solid var(--signal);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: rotate(-7deg);
  color: var(--signal);
  font: 10px/1 var(--mono);
  letter-spacing: .18em;
}
.vault-stamp strong { display: block; margin: 12px 0; font-size: 29px; letter-spacing: .04em; }
.release-ledger { margin: 0; border-top: 1px solid rgba(245,242,233,.3); }
.release-ledger div { display: flex; justify-content: space-between; gap: 24px; padding: 10px 0; border-bottom: 1px solid rgba(245,242,233,.2); font: 10px/1.2 var(--mono); text-transform: uppercase; }
.release-ledger dt, .release-ledger dd { margin: 0; }
.release-ledger dd { color: var(--signal); }

.install { align-items: end; }
.terminal { border: 1px solid var(--ink); background: var(--paper-light); }
.terminal-bar { display: flex; justify-content: space-between; align-items: center; padding: 12px 15px; border-bottom: 1px solid var(--ink); font: 10px/1 var(--mono); text-transform: uppercase; }
.terminal-bar button { border: 0; padding: 0; background: transparent; font: inherit; text-transform: uppercase; cursor: pointer; border-bottom: 1px solid currentColor; }
.terminal pre { margin: 0; padding: clamp(24px, 4vw, 52px); overflow-x: auto; font-size: clamp(11px, 1.2vw, 14px); line-height: 1.8; }

.site-footer {
  display: grid;
  grid-template-columns: .6fr 1fr auto;
  align-items: end;
  gap: 50px;
  padding: 70px var(--gutter);
  background: var(--signal);
  color: #fffaf0;
}
.footer-word { font-family: var(--serif); font-size: clamp(64px, 10vw, 140px); line-height: .62; letter-spacing: -.08em; }
.site-footer p { max-width: 430px; margin: 0; font-family: var(--serif); font-size: 22px; }
.site-footer .footer-small { margin-top: 18px; font-family: var(--mono); font-size: 9px; text-transform: uppercase; }
.footer-links { display: flex; flex-direction: column; gap: 12px; font: 10px/1 var(--mono); text-transform: uppercase; }
.footer-links a { border-bottom: 1px solid currentColor; padding-bottom: 3px; }

.cursor-readout {
  position: fixed;
  z-index: 50;
  right: 14px;
  bottom: 12px;
  padding: 5px 7px;
  color: var(--paper-light);
  background: var(--ink);
  font: 8px/1 var(--mono);
  pointer-events: none;
  mix-blend-mode: multiply;
}

@media (max-width: 1050px) {
  .site-header { grid-template-columns: 1fr auto; }
  .header-status { display: none; }
  .site-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 28px var(--gutter); background: var(--paper); border-bottom: 1px solid var(--ink); flex-direction: column; align-items: flex-end; font-size: 16px; }
  .site-header[data-open="true"] .site-nav { display: flex; }
  .menu-button { display: inline-flex; flex-direction: column; gap: 6px; border: 0; background: transparent; padding: 10px 0 10px 14px; }
  .menu-button span { width: 25px; height: 1px; background: var(--ink); }
  .hero { grid-template-columns: 1fr; padding-top: 90px; }
  .hero::before { display: none; }
  .hero-copy { padding-right: 10vw; }
  .boundary-study { width: min(780px, 100%); margin-left: auto; }
  .hero-note { position: static; margin-top: -10px; }
  .section-grid { grid-template-columns: 1fr; }
  .section-heading { max-width: 760px; }
  .manuscript { grid-template-columns: 30px 1fr; }
  .vault { grid-column: 2; }
  .metric-display { grid-template-columns: 1fr; }
  .metric-diagram { border-right: 0; border-bottom: 1px solid var(--ink); }
}

@media (max-width: 680px) {
  :root { --gutter: 18px; }
  body { background: var(--paper); }
  .site-header { min-height: 56px; }
  .site-nav { top: 56px; }
  .hero { min-height: auto; padding-top: 82px; gap: 62px; }
  .hero-copy { padding-right: 0; }
  .hero h1 { font-size: clamp(58px, 20vw, 88px); }
  .hero h1 em { transform: translateX(12px); }
  .hero-intro { font-size: 21px; }
  .hero-actions { flex-direction: column; align-items: flex-start; gap: 14px; }
  .study-controls { grid-template-columns: 1fr; }
  .study-controls input, .control-scale { grid-column: 1; }
  .statement { padding-top: 84px; padding-bottom: 84px; }
  .section-grid { padding-top: 88px; padding-bottom: 88px; }
  .section-number { margin-bottom: 26px; }
  .apparatus li { grid-template-columns: 1fr; padding-right: 38px; }
  .apparatus code { grid-column: 1; }
  .method-tabs { grid-template-columns: 1fr 1fr; }
  .method-tabs button:nth-child(2) { border-right: 0; }
  .method-tabs button:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .method-list { min-height: 0; }
  .method-row { grid-template-columns: 38px 1fr 28px; gap: 10px; padding: 8px 0; }
  .method-family { grid-column: 2; }
  .method-toggle { grid-row: 1 / span 2; grid-column: 3; }
  .method-detail { grid-column: 2 / -1; grid-template-columns: 1fr; }
  .method-footnote { flex-direction: column; }
  .metric-selector { display: grid; grid-template-columns: 1fr 1fr; }
  .metric-display { min-height: 0; }
  .metric-copy { padding: 28px 22px 36px; }
  .manuscript { grid-template-columns: 1fr; gap: 46px; }
  .manuscript-margin { display: none; }
  .vault { grid-column: 1; }
  .site-footer { grid-template-columns: 1fr; gap: 42px; }
  .footer-word { font-size: 92px; }
  .cursor-readout { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Grid children must be allowed to shrink around long code identifiers. */
.section-grid > *, .section-heading, .terminal, .terminal pre { min-width: 0; }

/* ── Official product-theme alignment ──────────────────────────────── */
:root {
  --paper: #f8fafc;
  --paper-light: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --rule: #e2e8f0;
  --rule-strong: #cbd5e1;
  --signal: #02b0dd;
  --signal-dark: #028caf;
  --specimen: #d9eef4;
  --specimen-dark: #83c9da;
  --blueprint: #2563eb;
  --serif: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}
body {
  background:
    linear-gradient(90deg, transparent calc(var(--gutter) - 1px), rgba(148,163,184,.18) var(--gutter), transparent calc(var(--gutter) + 1px)),
    var(--paper);
  font-size: 15px;
}
::selection { color: #fff; background: var(--signal); }
.site-header {
  min-height: 56px;
  border-bottom-color: var(--rule);
  background: rgba(255,255,255,.92);
  box-shadow: 0 1px 3px rgba(15,23,42,.04);
}
.wordmark { color: var(--signal); font-size: 14px; letter-spacing: -.03em; }
.wordmark-mark {
  width: 18px; height: 18px; border: 0; border-radius: 4px;
  background:
    linear-gradient(145deg, transparent 0 34%, #fff 35% 43%, transparent 44%),
    var(--signal);
  box-shadow: inset 0 0 0 1px rgba(2,176,221,.18);
}
.header-status {
  color: var(--muted); background: #f1f5f9; border: 1px solid var(--rule);
  border-radius: 999px; padding: 5px 10px; letter-spacing: .04em;
}
.status-dot { background: #f59e0b; animation: none; }
.site-nav { color: #475569; text-transform: none; letter-spacing: 0; font-family: var(--sans); font-weight: 500; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--signal-dark); border-bottom-color: var(--signal); }
.hero { border-bottom-color: var(--rule); padding-top: clamp(86px, 9vw, 132px); }
.hero::before { border-color: var(--rule); }
.hero-index, .eyebrow, .section-kicker { color: #64748b; }
.hero h1 { font-weight: 600; letter-spacing: -.065em; line-height: .87; }
.hero h1 em { color: var(--signal); font-style: normal; }
.hero-intro { color: #334155; font-weight: 400; letter-spacing: -.035em; }
.text-action {
  border: 1px solid var(--rule); border-radius: 5px; padding: 10px 13px;
  background: #fff; box-shadow: 0 1px 2px rgba(15,23,42,.04);
  text-transform: none; letter-spacing: 0; font-family: var(--sans); font-weight: 600;
}
.text-action:hover { border-color: #b8dce5; background: #f0fbfe; color: var(--signal-dark); }
.text-action.inverse { background: var(--signal); color: #fff; border-color: var(--signal); }
.text-action.inverse:hover { background: var(--signal-dark); color: #fff; }
.study-meta { color: #64748b; }
.study-paper { fill: #fff; }
.study-frame { stroke: #cbd5e1; }
.study-grid { color: #d9eef4; }
.registration-marks path { stroke: #94a3b8; }
.specimen-fill > rect { fill: #dceff4; opacity: .96; }
.specimen-band-a { stroke: #02b0dd; }
.specimen-band-b { stroke: #2563eb; }
.specimen-speckles circle { fill: #0f172a; opacity: .08; }
.contour-a { stroke: #0f172a; }
.contour-b { stroke: #02b0dd; }
.contour-c { stroke: #2563eb; }
.contour-d { stroke: #10b981; }
.consensus { stroke: #0f172a; }
.study-controls input { accent-color: var(--signal); }
.hero-note { color: #64748b; }
.note-number { color: var(--signal-dark); }
.statement { background: #fff; border-bottom-color: var(--rule); }
.statement p { font-weight: 500; letter-spacing: -.045em; }
.statement p span { color: var(--signal-dark); }
.section-grid { border-bottom-color: var(--rule); }
.section-heading h2 { font-weight: 600; letter-spacing: -.055em; }
.section-heading > p:last-child { color: #475569; }
.section-number { color: var(--signal-dark); }
.apparatus { border-top-color: var(--rule-strong); }
.apparatus li { border-bottom-color: var(--rule); }
.apparatus li:hover { background: #fff; box-shadow: inset 3px 0 0 var(--signal); }
.apparatus-name { font-weight: 600; }
.apparatus code { color: var(--signal-dark); background: #effbfe; border: 1px solid #d4f1f7; border-radius: 4px; padding: 4px 7px; }
.method-register, .metric-instrument, .terminal { border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(15,23,42,.05); }
.method-tabs { border-color: var(--rule); background: #f1f5f9; }
.method-tabs button { border-color: var(--rule) !important; color: #475569; text-transform: none; letter-spacing: 0; font-family: var(--sans); font-weight: 600; }
.method-tabs button[aria-selected="true"] { background: #fff; color: var(--signal-dark); box-shadow: inset 0 -2px 0 var(--signal); }
.method-list { background: #fff; }
.method-row { border-color: var(--rule); }
.method-row:hover, .method-row:focus-within { background: #f8fafc; }
.method-name { font-family: var(--sans); font-weight: 600; }
.method-family { color: #64748b; }
.method-detail code { color: var(--signal-dark); }
.metric-selector { border-color: var(--rule-strong); background: #f1f5f9; }
.metric-selector button { border-color: var(--rule) !important; color: #475569; text-transform: none; letter-spacing: 0; font-family: var(--sans); font-weight: 600; }
.metric-selector button[aria-selected="true"] { background: #fff; color: var(--signal-dark); box-shadow: inset 0 -2px 0 var(--signal); }
.metric-display { background: #fff; border-color: var(--rule-strong); }
.metric-diagram { border-color: var(--rule); background: #fbfdff; }
.metric-ground { stroke: #64748b; }
.metric-prediction { stroke: var(--signal); }
.metric-measure { stroke: #2563eb; }
.metric-prediction-label { fill: var(--signal-dark) !important; }
.metric-copy h3 { font-family: var(--sans); font-weight: 600; letter-spacing: -.045em; }
.metric-code { color: var(--signal-dark); }
.manuscript { color: #e2e8f0; background: #0f172a; }
.manuscript::before { opacity: .06; }
.manuscript-margin { color: var(--signal); }
.manuscript-copy p:not(.section-kicker) { font-family: var(--sans); color: #cbd5e1; }
.vault { border-color: #334155; border-radius: 8px; background: #111c31; }
.vault-stamp { color: var(--signal); border-color: var(--signal); }
.release-ledger { border-color: #334155; }
.release-ledger div { border-color: #26364e; }
.release-ledger dd { color: var(--signal); }
.terminal { border-color: var(--rule-strong); background: #fff; }
.terminal-bar { border-color: var(--rule); background: #f1f5f9; }
.terminal-bar button { color: var(--signal-dark); }
.site-footer { background: #02b0dd; color: #fff; }
.footer-word { font-family: var(--sans); font-weight: 700; letter-spacing: -.075em; }
.site-footer p { font-family: var(--sans); }
.cursor-readout { color: #475569; background: #fff; border: 1px solid var(--rule); box-shadow: 0 1px 3px rgba(15,23,42,.08); mix-blend-mode: normal; }
@media (max-width: 1050px) {
  .site-nav { background: #fff; border-bottom-color: var(--rule); }
}
@media (max-width: 680px) {
  body { background: var(--paper); }
  .hero h1 { font-size: clamp(56px, 18vw, 84px); }
}

/* ── Hard-case gallery ─────────────────────────────────────────────── */
.hard-cases { background: var(--paper-light); }
.hard-case-exhibit { min-width: 0; }
.hard-case-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 12px 0;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule);
}
.hard-case-criterion { display: flex; align-items: baseline; gap: 12px; min-width: 0; }
.hard-case-criterion span {
  font: 9px/1 var(--mono);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .07em;
}
.hard-case-criterion strong { font: 11px/1.35 var(--mono); font-weight: 500; }
.hard-case-controls { display: flex; align-items: center; gap: 12px; }
.hard-case-method-picker { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 4px; }
.hard-case-method-button {
  appearance: none;
  border: 1px solid var(--rule-strong);
  background: transparent;
  padding: 7px 9px;
  font: 10px/1 var(--mono);
  cursor: pointer;
}
.hard-case-method-button[aria-pressed="true"] { color: var(--paper-light); background: var(--ink); }
.reference-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding-left: 10px;
  border-left: 1px solid var(--rule);
  font: 10px/1 var(--mono);
  white-space: nowrap;
}
.reference-toggle input { accent-color: var(--signal); }
.hard-case-summary { margin: 14px 0 20px; color: var(--muted); font: 10px/1.4 var(--mono); }
.hard-case-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.hard-case-card { min-width: 0; border: 1px solid var(--rule-strong); background: var(--paper); }
.hard-case-media, .hard-case-placeholder {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: rgba(23,23,19,.05);
  border-bottom: 1px solid var(--rule);
}
.hard-case-base, .hard-case-overlay { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.hard-case-overlay { pointer-events: none; }
.hard-case-reference[hidden] { display: none; }
.hard-case-legend {
  position: absolute;
  left: 10px;
  bottom: 10px;
  display: flex;
  gap: 8px;
  padding: 5px 7px;
  background: rgba(245,242,233,.92);
  border: 1px solid var(--rule);
  font: 9px/1 var(--mono);
}
.hard-case-legend span::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 2px;
  margin-right: 5px;
  vertical-align: middle;
  background: var(--ink);
}
.hard-case-legend .prediction-key::before { background: var(--signal); }
.hard-case-placeholder {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 7px;
  padding: 22px;
  color: var(--muted);
}
.hard-case-placeholder::before { content: ""; position: absolute; inset: 18px; border: 1px dashed var(--rule-strong); }
.hard-case-placeholder > * { position: relative; z-index: 1; }
.hard-case-placeholder > span { font: 9px/1 var(--mono); text-transform: uppercase; letter-spacing: .07em; }
.hard-case-placeholder strong { color: var(--ink); font-family: var(--serif); font-size: 20px; font-weight: 400; overflow-wrap: anywhere; }
.hard-case-placeholder small { max-width: 330px; font-size: 11px; line-height: 1.45; }
.hard-case-copy { display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; padding: 16px 16px 12px; }
.hard-case-index { font: 9px/1 var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.hard-case-copy h3 { margin: 6px 0 0; font-family: var(--serif); font-size: 18px; font-weight: 400; overflow-wrap: anywhere; }
.hard-case-active-score { min-width: 94px; text-align: right; }
.hard-case-active-score span { display: block; max-width: 150px; color: var(--muted); font: 9px/1.2 var(--mono); }
.hard-case-active-score strong { display: block; margin-top: 5px; font: 500 21px/1 var(--mono); color: var(--signal-dark); }
.hard-case-scores { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--rule); }
.hard-case-scores span { min-width: 0; display: flex; flex-direction: column; gap: 4px; padding: 9px 10px; border-right: 1px solid var(--rule); }
.hard-case-scores span:last-child { border-right: 0; }
.hard-case-scores b { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); font: 9px/1.2 var(--mono); font-weight: 400; }
.hard-case-scores i { font: normal 11px/1 var(--mono); color: var(--ink); }
.hard-case-footnote { margin: 16px 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.hard-case-empty { padding: 22px; border: 1px solid var(--rule); color: var(--muted); }

@media (max-width: 1050px) {
  .hard-case-toolbar { align-items: flex-start; flex-direction: column; }
  .hard-case-controls { width: 100%; justify-content: space-between; }
  .hard-case-method-picker { justify-content: flex-start; }
}
@media (max-width: 680px) {
  .hard-case-controls { align-items: flex-start; flex-direction: column; }
  .reference-toggle { padding-left: 0; border-left: 0; }
  .hard-case-grid { grid-template-columns: 1fr; }
  .hard-case-scores { grid-template-columns: 1fr; }
  .hard-case-scores span { flex-direction: row; justify-content: space-between; border-right: 0; border-bottom: 1px solid var(--rule); }
  .hard-case-scores span:last-child { border-bottom: 0; }
}

/* ── Presentation refinement: quieter type, unified spacing ───────── */
:root {
  --content: 1320px;
  --gutter: clamp(22px, 4vw, 56px);
}
body {
  background: var(--paper);
  font-size: 15px;
  line-height: 1.55;
}
.site-header {
  min-height: 60px;
  display: flex;
  justify-content: space-between;
  gap: 36px;
  padding: 0 max(var(--gutter), calc((100vw - var(--content)) / 2 + var(--gutter)));
  border-bottom-color: var(--rule);
}
.wordmark {
  gap: 0;
  font-size: 16px;
  color: var(--signal-dark);
  letter-spacing: -.045em;
}
.wordmark-mark, .header-status { display: none !important; }
.site-nav { gap: 24px; font-size: 13px; }
.site-nav a { padding: 6px 0; }

.hero {
  min-height: 0;
  padding-top: clamp(72px, 7vw, 96px);
  padding-bottom: clamp(64px, 7vw, 92px);
  grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr);
  gap: clamp(48px, 6vw, 82px);
  border-bottom-color: var(--rule);
}
.hero::before { display: none; }
.hero-copy { align-self: center; }
.eyebrow, .section-kicker { margin-bottom: 16px; font-size: 10px; }
.hero h1 {
  max-width: 680px;
  font-size: clamp(48px, 5.5vw, 78px);
  line-height: .96;
  letter-spacing: -.055em;
}
.hero h1 em {
  display: inline;
  margin: 0;
  transform: none;
  color: var(--signal-dark);
}
.hero-intro {
  max-width: 560px;
  margin-top: 28px;
  font-size: clamp(18px, 1.55vw, 21px);
  line-height: 1.45;
  letter-spacing: -.02em;
}
.hero-actions { margin-top: 28px; gap: 14px; }
.text-action { font-size: 12px; text-transform: none; letter-spacing: 0; }
.boundary-study { max-width: 680px; margin-left: auto; }
.study-meta { padding-bottom: 10px; font-size: 9px; text-transform: uppercase; }
.contour-c, .contour-d, .consensus { display: none; }
.contour-a { stroke: #475569; stroke-width: 2; stroke-dasharray: 6 5; opacity: .9; }
.contour-b { stroke: var(--signal); stroke-width: 3; stroke-dasharray: none; opacity: .95; }
.study-legend {
  display: flex;
  justify-content: flex-end;
  gap: 20px;
  padding-top: 12px;
  color: var(--muted);
  font: 10px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.study-legend span::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 7px;
  vertical-align: middle;
}
.study-legend-reference::before { background: #475569; }
.study-legend-prediction::before { background: var(--signal); }

.statement {
  width: min(100%, var(--content));
  margin: 0 auto;
  padding: clamp(48px, 5vw, 68px) var(--gutter);
  border-bottom-color: var(--rule);
  background: var(--paper-light);
}
.statement p {
  max-width: 980px;
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.12;
  letter-spacing: -.04em;
  font-weight: 500;
}
.section-grid {
  padding-top: clamp(68px, 7vw, 94px);
  padding-bottom: clamp(68px, 7vw, 94px);
  grid-template-columns: minmax(250px, .62fr) minmax(0, 1.38fr);
  gap: clamp(48px, 7vw, 92px);
  border-bottom-color: var(--rule);
}
.section-number { margin-bottom: 28px; }
.section-heading h2, .evaluation h2 {
  font-size: clamp(32px, 3.8vw, 50px);
  line-height: 1.02;
  letter-spacing: -.045em;
}
.section-heading > p:last-child {
  margin-top: 22px;
  font-size: 17px;
  line-height: 1.5;
}
.apparatus { border-top-color: var(--rule-strong); }
.apparatus li {
  grid-template-columns: .42fr 1fr;
  min-height: 112px;
  padding: 22px 44px 22px 0;
  border-bottom-color: var(--rule);
}
.apparatus li:hover { box-shadow: none; background: transparent; }
.apparatus-name { font-size: clamp(27px, 2.5vw, 36px); }
.apparatus p { margin-top: 2px; font-size: 15px; color: #475569; }
.apparatus code { display: none; }

.method-tabs { grid-template-columns: repeat(3, 1fr); }
.method-register { box-shadow: none; border-radius: 0; }
.method-list { min-height: 0; }
.method-row-simple {
  grid-template-columns: 48px 1fr auto;
  min-height: 48px;
  padding: 10px 12px 10px 0;
  cursor: default;
}
.method-row-simple:hover { background: #f8fafc; }
.method-row-simple .method-name { font-size: 15px; }
.method-row-simple .method-family { align-self: center; font-size: 11px; text-transform: capitalize; }
.method-row-simple .method-toggle, .method-row-simple .method-detail { display: none; }

.metric-instrument { box-shadow: none; border-radius: 0; }
.metric-selector { display: grid; grid-template-columns: repeat(4, 1fr); }
.metric-selector button { text-transform: none; font-family: var(--sans); font-size: 12px; font-weight: 600; }
.metric-display { min-height: 360px; grid-template-columns: 1.25fr .75fr; }
.metric-copy { padding: clamp(28px, 3vw, 44px); }
.metric-copy h3 { margin: 10px 0 14px; font-size: clamp(30px, 3vw, 42px); }
.metric-copy p { margin: 0; color: #475569; }
.metric-copy code { display: none; }
.metric-code { font-family: var(--sans); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }

.hard-cases { background: var(--paper-light); }
.hard-case-toolbar { padding: 10px 0; gap: 18px; }
.hard-case-criterion { gap: 9px; }
.hard-case-criterion strong { font-family: var(--sans); font-size: 12px; color: #334155; }
.hard-case-method-button {
  padding: 7px 10px;
  border-radius: 4px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
}
.hard-case-method-button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.reference-toggle { font-family: var(--sans); font-size: 11px; }
.hard-case-summary { margin: 14px 0 18px; font-family: var(--sans); font-size: 12px; }
.hard-case-grid { gap: 20px; }
.hard-case-card { border-color: var(--rule); border-radius: 8px; overflow: hidden; background: #fff; }
.hard-case-media, .hard-case-placeholder { aspect-ratio: 16 / 10; background: #f3f6f8; }
.hard-case-base, .hard-case-overlay { object-fit: contain; }
.hard-case-placeholder {
  position: relative;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 9px;
  padding: 26px;
  text-align: center;
}
.hard-case-placeholder::before { display: none; }
.placeholder-specimen {
  width: min(65%, 250px);
  aspect-ratio: 1.7 / 1;
  border-radius: 46% 54% 48% 52% / 52% 44% 56% 48%;
  background:
    radial-gradient(circle at 34% 42%, rgba(2,176,221,.22), transparent 20%),
    radial-gradient(circle at 65% 58%, rgba(37,99,235,.13), transparent 24%),
    #dceff4;
  border: 2px solid #94a3b8;
  transform: rotate(-2deg);
}
.hard-case-placeholder > span { font: 600 12px/1.2 var(--sans); color: #475569; text-transform: none; letter-spacing: 0; }
.hard-case-placeholder small { color: #94a3b8; font-size: 11px; }
.hard-case-copy { padding: 14px 16px 12px; }
.hard-case-copy h3 { margin-top: 5px; font-family: var(--sans); font-size: 17px; font-weight: 600; }
.hard-case-index { font-family: var(--sans); font-size: 10px; }
.hard-case-active-score strong { font-size: 19px; }
.hard-case-scores span { padding: 9px 10px; }
.hard-case-scores b { font-family: var(--sans); font-size: 10px; }
.hard-case-scores i { font-family: var(--mono); font-size: 10px; }
.hard-case-legend { border-radius: 4px; background: rgba(255,255,255,.92); }

.evaluation { background: var(--paper); }
.evaluation-panel {
  align-self: center;
  max-width: 680px;
  padding: clamp(28px, 4vw, 46px);
  border: 1px solid var(--rule);
  background: #fff;
}
.evaluation-panel p { margin: 0 0 24px; font-size: 17px; line-height: 1.55; color: #475569; }

.site-footer {
  width: min(100%, var(--content));
  margin: 0 auto;
  grid-template-columns: .6fr 1fr auto;
  gap: 42px;
  padding: 46px var(--gutter);
  background: var(--paper-light);
  color: var(--ink);
  border-top: 0;
}
.footer-brand { align-self: start; font-size: 19px; font-weight: 700; letter-spacing: -.045em; color: var(--signal-dark); }
.site-footer p { max-width: 430px; font-size: 14px; line-height: 1.5; color: #64748b; }
.footer-links { font-family: var(--sans); font-size: 12px; text-transform: none; }
.footer-links a { border-bottom-color: var(--rule-strong); }
.footer-word, .footer-small { display: none !important; }

@media (max-width: 1050px) {
  .site-header { padding-left: var(--gutter); padding-right: var(--gutter); }
  .hero { grid-template-columns: 1fr; }
  .hero-copy { padding-right: 0; max-width: 760px; }
  .boundary-study { margin: 0; width: min(760px, 100%); }
  .section-grid { grid-template-columns: 1fr; gap: 38px; }
  .section-heading { max-width: 700px; }
  .hard-case-toolbar { align-items: flex-start; }
}
@media (max-width: 680px) {
  .site-header { min-height: 56px; }
  .site-nav { top: 56px; }
  .hero { padding-top: 62px; gap: 42px; }
  .hero h1 { font-size: clamp(42px, 13vw, 62px); }
  .hero-intro { font-size: 17px; }
  .statement { padding-top: 42px; padding-bottom: 42px; }
  .statement p { font-size: 28px; }
  .section-grid { padding-top: 58px; padding-bottom: 58px; }
  .apparatus li { grid-template-columns: 1fr; gap: 10px; min-height: 0; padding: 20px 34px 20px 0; }
  .method-tabs { grid-template-columns: 1fr 1fr 1fr; }
  .method-tabs button { padding: 12px 8px; font-size: 11px; }
  .method-row-simple { grid-template-columns: 36px 1fr auto; }
  .metric-selector { grid-template-columns: 1fr 1fr; }
  .metric-display { grid-template-columns: 1fr; }
  .hard-case-grid { grid-template-columns: 1fr; }
  .hard-case-scores { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .hard-case-scores span { flex-direction: column; justify-content: flex-start; border-right: 1px solid var(--rule); border-bottom: 0; }
  .hard-case-scores span:last-child { border-right: 0; }
  .site-footer { grid-template-columns: 1fr; gap: 20px; padding-top: 34px; padding-bottom: 34px; }
}

/* final scale adjustments */
.hero h1 { font-size: clamp(44px, 5vw, 68px); }
.section-heading h2, .evaluation h2 { font-size: clamp(30px, 3.4vw, 44px); }
.section-grid { padding-top: clamp(62px, 6vw, 82px); padding-bottom: clamp(62px, 6vw, 82px); }
.placeholder-specimen { width: 58%; min-width: 150px; max-width: 250px; }
@media (max-width: 680px) {
  .hero h1 { font-size: clamp(40px, 12vw, 54px); }
  .section-heading h2, .evaluation h2 { font-size: 30px; }
}
.not-found {
  width: min(100%, var(--content));
  min-height: calc(100vh - 160px);
  margin: 0 auto;
  padding: clamp(96px, 12vw, 170px) var(--gutter);
}
.not-found h1 { margin: 0; font-size: clamp(42px, 5vw, 68px); letter-spacing: -.05em; }
.not-found > p:not(.eyebrow) { max-width: 520px; margin: 20px 0 28px; color: #475569; font-size: 18px; }

/* ── Requested restoration: preserve original brand/footer, enlarge hero study ── */
:root { --content: 1480px; }

.wordmark {
  color: var(--signal);
  font-size: 14px;
  letter-spacing: -.03em;
}

.hero {
  grid-template-columns: minmax(320px, .62fr) minmax(560px, 1.38fr);
  gap: clamp(44px, 5vw, 72px);
  padding-top: clamp(72px, 6vw, 92px);
  padding-bottom: clamp(58px, 6vw, 82px);
}
.hero h1 { font-size: clamp(44px, 4.6vw, 64px); }
.hero-intro { max-width: 520px; font-size: clamp(17px, 1.35vw, 20px); }
.boundary-study {
  width: 100%;
  max-width: 880px;
  margin-left: auto;
}

/* Restore the supplied site's footer rather than redesigning it. */
.site-footer {
  width: 100%;
  margin: 0;
  display: grid;
  grid-template-columns: .6fr 1fr auto;
  align-items: end;
  gap: 50px;
  padding: 70px var(--gutter);
  background: #02b0dd;
  color: #fff;
}
.footer-word {
  display: block !important;
  font-family: var(--sans);
  font-size: clamp(64px, 10vw, 140px);
  font-weight: 700;
  line-height: .62;
  letter-spacing: -.075em;
}
.site-footer p {
  max-width: 430px;
  margin: 0;
  font-family: var(--sans);
  font-size: 22px;
  line-height: 1.5;
  color: inherit;
}
.site-footer .footer-small {
  display: block !important;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.4;
  text-transform: uppercase;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font: 10px/1 var(--mono);
  text-transform: uppercase;
}
.footer-links a { border-bottom: 1px solid currentColor; padding-bottom: 3px; }
.footer-brand { display: none !important; }

@media (max-width: 1180px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { max-width: 720px; }
  .boundary-study { width: min(900px, 100%); max-width: none; margin: 0 auto; }
}
@media (max-width: 680px) {
  .hero { gap: 38px; }
  .hero h1 { font-size: clamp(40px, 12vw, 54px); }
  .boundary-study { width: 100%; }
  .site-footer { grid-template-columns: 1fr; gap: 42px; }
  .footer-word { font-size: 92px; }
}


/* Hard-case gallery: accommodate optional comparison methods. */
.hard-case-scores {
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--rule);
}
.hard-case-scores span,
.hard-case-scores span:last-child {
  border: 0;
  background: #fff;
}
@media (max-width: 680px) {
  .hard-case-scores { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hard-case-scores span,
  .hard-case-scores span:last-child {
    flex-direction: column;
    justify-content: flex-start;
    border: 0;
  }
}

/* v8 — one brand blue for all highlighted text */
.wordmark,
.hero h1 em,
.note-number,
.statement p span,
.section-number,
.apparatus code,
.method-tabs button[aria-selected="true"],
.method-detail code,
.metric-selector button[aria-selected="true"],
.metric-code,
.terminal-bar button,
.hard-case-active-score strong,
.footer-brand {
  color: var(--signal);
}
.metric-prediction-label {
  fill: var(--signal) !important;
}


/* ── Viewer walkthrough ───────────────────────────────────────────── */
.viewer-demo {
  background: #fff;
}
.viewer-video-shell {
  position: relative;
  min-width: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background:
    radial-gradient(circle at 25% 28%, rgba(2,176,221,.09), transparent 24%),
    linear-gradient(145deg, #f8fafc, #eef5f8);
  box-shadow: 0 12px 36px rgba(15,23,42,.07);
}
.viewer-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #0f172a;
}
.statement strong {
  color: var(--signal-dark);
  font-weight: inherit;
}

@media (max-width: 680px) {
  .viewer-video-shell { border-radius: 7px; }
}