:root {
  --cream: #f3ede1;
  --paper: #fffaf1;
  --ink: #2b1b15;
  --desk: #241713;
  --red: #c91010;
  --red-dark: #9e1010;
  --gold: #d2ac55;
  --olive: #72783d;
  --muted: #786a62;
  --line: rgba(43, 27, 21, .17);
  --line-dark: rgba(255, 250, 241, .16);
  --mono: "JetBrains Mono", monospace;
  --sans: "Instrument Sans", sans-serif;
  --serif: "Fraunces", serif;
  --ease-out: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--cream); color: var(--ink); font-family: var(--sans); }
button, a { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }

.project-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 64px;
  padding: 0 clamp(20px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 237, 225, .94);
  backdrop-filter: blur(14px);
  font: 500 11px/1 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
}
.project-nav a { color: inherit; text-decoration: none; }

.hero {
  position: relative;
  min-height: 72svh;
  max-width: 1500px;
  margin: 0 auto;
  padding: clamp(78px, 10vw, 145px) clamp(22px, 7vw, 112px) clamp(64px, 8vw, 110px);
  display: grid;
  align-content: center;
  overflow: hidden;
}
.hero-mark {
  position: absolute;
  right: clamp(10px, 4vw, 60px);
  bottom: -4vw;
  color: rgba(201, 16, 16, .055);
  font: 600 clamp(190px, 32vw, 500px)/.78 var(--serif);
  letter-spacing: -.09em;
  pointer-events: none;
}
.eyebrow, .section-label {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--red);
  font: 500 11px/1.3 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}
h1, h2, h3, h4, p { margin-top: 0; }
h1 {
  position: relative;
  z-index: 1;
  max-width: 1250px;
  margin: 24px 0 42px;
  font: 500 clamp(58px, 8.5vw, 132px)/.86 var(--serif);
  letter-spacing: -.05em;
}
h1 em { color: var(--red); font-weight: 350; }
.hero-footer { position: relative; z-index: 1; max-width: 1050px; display: grid; grid-template-columns: 1fr auto; gap: 54px; align-items: end; }
.lede { margin: 0; max-width: 760px; color: #55443c; font-size: clamp(17px, 1.8vw, 23px); line-height: 1.5; }
.paper-button {
  min-width: 210px;
  padding: 15px 18px;
  display: grid;
  gap: 7px;
  border-radius: 14px;
  background: var(--red);
  color: #fffaf1;
  text-decoration: none;
  transition: transform 150ms var(--ease-out), background-color 160ms ease;
}
.paper-button span { font-weight: 600; }
.paper-button b { font: 500 10px/1 var(--mono); letter-spacing: .08em; }
.paper-button:active { transform: scale(.975); }

.desk { padding: clamp(64px, 8vw, 110px) clamp(16px, 4vw, 64px); background: var(--desk); color: var(--paper); }
.desk-heading { max-width: 1370px; margin: 0 auto 44px; display: grid; grid-template-columns: 1.4fr .6fr; gap: 64px; align-items: end; }
.desk-heading h2, .evidence h2 { margin: 11px 0 0; font: 500 clamp(42px, 5.6vw, 80px)/.95 var(--serif); letter-spacing: -.04em; }
.desk-heading > p { margin: 0; color: rgba(255, 250, 241, .64); font-size: 15px; line-height: 1.6; }

.chain {
  position: sticky;
  top: 78px;
  z-index: 20;
  max-width: 1370px;
  margin: 0 auto 14px;
  padding: 7px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line-dark);
  border-radius: 18px;
  background: rgba(36, 23, 19, .94);
  backdrop-filter: blur(14px);
  box-shadow: 0 16px 50px rgba(0, 0, 0, .18);
}
.chain a {
  position: relative;
  min-height: 68px;
  padding: 11px 13px 10px 43px;
  display: grid;
  align-content: center;
  gap: 3px;
  border-radius: 12px;
  color: rgba(255, 250, 241, .72);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease, transform 150ms var(--ease-out);
}
.chain a + a::before { content: ""; position: absolute; left: -4px; top: 16px; bottom: 16px; width: 1px; background: var(--line-dark); }
.chain a > span { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--gold); font: 500 10px/1 var(--mono); }
.chain a b { font-size: 13px; }
.chain a small { font: 400 9px/1.2 var(--mono); letter-spacing: .05em; text-transform: uppercase; opacity: .54; }
.chain a[aria-current="true"] { background: var(--paper); color: var(--ink); }
.chain a[aria-current="true"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 5px; height: 2px; border-radius: 2px; background: var(--red); }
.chain a:active { transform: scale(.985); }

.desk-surface { max-width: 1370px; margin: 0 auto; overflow: hidden; border-radius: 26px; background: var(--paper); color: var(--ink); box-shadow: 0 36px 100px rgba(0, 0, 0, .24); }
.desk-stage { scroll-margin-top: 168px; position: relative; padding: clamp(34px, 5vw, 70px); }
.desk-stage + .desk-stage { border-top: 1px solid var(--line); }
.desk-stage + .desk-stage::before { content: "↓"; position: absolute; top: -18px; left: clamp(34px, 5vw, 70px); width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); color: var(--red); font: 500 13px/1 var(--mono); }
.stage-heading { display: grid; grid-template-columns: 54px minmax(0, 760px); gap: 19px; align-items: start; }
.stage-number { width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--red); font: 500 11px/1 var(--mono); }
.stage-heading p { margin: 1px 0 8px; color: var(--red); font: 500 10px/1 var(--mono); letter-spacing: .11em; text-transform: uppercase; }
.stage-heading h3 { margin: 0; font: 500 clamp(31px, 4vw, 56px)/.98 var(--serif); letter-spacing: -.035em; }

.stage-controls { margin: 28px 0 24px 73px; }
.segmented { width: max-content; max-width: calc(100% - 73px); padding: 4px; display: flex; flex-wrap: wrap; gap: 4px; border: 1px solid var(--line); border-radius: 15px; background: #eee5d8; }
.segmented button {
  position: relative;
  min-width: 150px;
  padding: 10px 14px;
  display: grid;
  gap: 4px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
  transition: color 150ms ease, background-color 150ms ease, box-shadow 150ms ease, transform 130ms var(--ease-out);
}
.segmented.compact button { min-width: 115px; text-align: center; }
.segmented button span { font-size: 13px; font-weight: 600; }
.segmented button small { font: 400 9px/1 var(--mono); letter-spacing: .04em; text-transform: uppercase; opacity: .68; }
.segmented button[aria-selected="true"] { background: var(--paper); color: var(--ink); box-shadow: 0 4px 14px rgba(43, 27, 21, .1); }
.segmented button[aria-selected="true"]::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px; height: 2px; border-radius: 2px; background: var(--red); }
.segmented button:active, .kappa-switch button:active, .nudge-button:active { transform: scale(.97); }

.input-workbench { display: grid; grid-template-columns: 1.2fr .8fr; gap: 14px; }
.tape-panel, .clock-panel { min-width: 0; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: #f1e9dc; }
.visual-label { display: flex; justify-content: space-between; gap: 20px; color: var(--muted); font: 500 9px/1.2 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.visual-label b { color: var(--red); }
.rank-tape { height: 238px; padding: 24px 10px 0; display: grid; grid-template-columns: repeat(8, 1fr); gap: clamp(7px, 1.2vw, 14px); align-items: end; border-bottom: 1px solid var(--line); }
.rank-tape i { height: var(--h); border-radius: 7px 7px 2px 2px; background: var(--tone); transform: translateY(var(--shift)); transition: height 220ms var(--ease-out), transform 220ms var(--ease-out); }
.schematic-note { margin: 12px 0 0; color: var(--muted); font: 400 10px/1.5 var(--mono); }
.input-copy { padding: 24px; border-radius: 18px; background: var(--ink); color: var(--paper); }
.micro { margin: 0 0 16px; color: var(--gold); font: 500 9px/1 var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.input-copy h4 { margin: 0 0 12px; font: 450 clamp(25px, 3vw, 38px)/1.04 var(--serif); }
.input-copy > p:not(.micro) { color: rgba(255, 250, 241, .67); font-size: 13px; line-height: 1.55; }
.metric-strip { margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line-dark); }
.metric-strip div { padding: 14px 8px 0 0; }
.metric-strip div + div { padding-left: 11px; border-left: 1px solid var(--line-dark); }
dt { color: var(--muted); font: 500 9px/1.25 var(--mono); letter-spacing: .04em; text-transform: uppercase; }
dd { margin: 6px 0 0; font: 500 23px/1 var(--mono); }
.input-copy dt { color: rgba(255, 250, 241, .52); }

.definition-row { margin-top: 14px; padding: 18px 20px; display: grid; grid-template-columns: .35fr .85fr 1fr; gap: 22px; align-items: center; border: 1px solid var(--line); border-radius: 14px; }
.definition-row span { color: var(--red); font: 500 9px/1.3 var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.definition-row b { font: 500 14px/1.5 var(--mono); }
.definition-row p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.55; }
.scope-note { margin: 18px 0 0; padding-top: 14px; display: grid; grid-template-columns: 180px 1fr; gap: 18px; border-top: 1px solid var(--line); color: var(--muted); font: 400 11px/1.55 var(--mono); }
.scope-note b { color: var(--red); font-size: 9px; letter-spacing: .06em; text-transform: uppercase; }

.nudge-lab { display: grid; grid-template-columns: 1fr auto 1fr .7fr; gap: 12px; align-items: center; }
.ranking { min-width: 0; padding: 17px; border: 1px solid var(--line); border-radius: 16px; background: #f1e9dc; }
.ranking > span { color: var(--red); font: 500 9px/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.ranking ol { margin: 14px 0 0; padding: 0; display: grid; gap: 4px; list-style: none; }
.ranking li { padding: 6px 8px; display: flex; justify-content: space-between; border-radius: 7px; background: rgba(43, 27, 21, .055); font: 500 10px/1.25 var(--mono); transition: color 180ms ease, background-color 180ms ease, transform 180ms var(--ease-out); }
.ranking li.moved { background: rgba(201, 16, 16, .1); color: var(--red); }
.nudge-button { width: 82px; height: 82px; padding: 8px; display: grid; place-items: center; gap: 4px; border: 0; border-radius: 50%; background: var(--red); color: #fffaf1; cursor: pointer; transition: transform 150ms var(--ease-out), background-color 160ms ease; }
.nudge-button span { font: 500 9px/1.2 var(--mono); text-align: center; }
.nudge-button i { font-style: normal; }
.measured { align-self: stretch; padding: 20px; display: grid; align-content: center; border-radius: 16px; background: var(--ink); color: var(--paper); }
.measured span { color: var(--gold); font: 500 9px/1.2 var(--mono); text-transform: uppercase; }
.measured strong { margin: 9px 0; color: #fffaf1; font: 500 clamp(40px, 5vw, 66px)/1 var(--serif); }
.measured p { margin: 0; color: rgba(255, 250, 241, .64); font-size: 12px; line-height: 1.5; }

.clock-lab { display: grid; grid-template-columns: 1.35fr .65fr; gap: 14px; }
.clock-plot { height: 286px; padding: 27px 9px 24px; display: grid; grid-template-columns: repeat(9, 1fr); align-items: end; gap: clamp(5px, 1vw, 11px); border-bottom: 1px solid var(--line); }
.clock-plot div { position: relative; height: var(--target); border-radius: 6px 6px 2px 2px; background: rgba(43, 27, 21, .13); }
.clock-plot div::after { content: ""; position: absolute; bottom: 0; left: 20%; width: 60%; height: var(--trade); border-radius: 5px 5px 2px 2px; background: var(--gold); transition: height 240ms var(--ease-out); }
.clock-plot div span { position: absolute; left: 50%; bottom: -20px; transform: translateX(-50%); color: var(--muted); font: 500 8px/1 var(--mono); }
.update-readout { padding: 22px; border-radius: 18px; background: var(--ink); color: var(--paper); }
.update-readout > p { margin: 0 0 20px; font: 450 25px/1.08 var(--serif); }
.update-readout dl { margin: 0; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line-dark); }
.update-readout dl div { padding: 12px 8px 10px 0; border-bottom: 1px solid var(--line-dark); }
.update-readout dl div:nth-child(even) { padding-left: 10px; border-left: 1px solid var(--line-dark); }
.update-readout dt { color: rgba(255, 250, 241, .5); }
.update-readout dd { font-size: 16px; }
.update-readout small { display: block; margin-top: 16px; color: rgba(255, 250, 241, .59); font-size: 11px; line-height: 1.5; }

.cost-layout { display: grid; grid-template-columns: 1.38fr .62fr; gap: 14px; }
.paper-figure { margin: 0; padding: 12px; border: 1px solid var(--line); border-radius: 18px; background: #f1e9dc; }
.paper-figure img { display: block; width: 100%; height: auto; border-radius: 11px; }
.paper-figure figcaption { padding: 10px 5px 2px; color: var(--muted); font-size: 10px; line-height: 1.45; }
.cost-console { padding: 22px; border-radius: 18px; background: var(--ink); color: var(--paper); }
.console-label { color: var(--gold); font: 500 9px/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.kappa-switch { margin-top: 13px; padding: 4px; display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; border: 1px solid var(--line-dark); border-radius: 11px; }
.kappa-switch button { min-width: 0; padding: 8px 3px; border: 0; border-radius: 7px; background: transparent; color: rgba(255, 250, 241, .63); font: 500 10px/1 var(--mono); cursor: pointer; transition: transform 130ms var(--ease-out), color 150ms ease, background-color 150ms ease; }
.kappa-switch button[aria-pressed="true"] { background: var(--gold); color: var(--ink); }
.kappa-readout { margin: 20px 0 16px; padding-bottom: 17px; border-bottom: 1px solid var(--line-dark); }
.kappa-readout span { color: rgba(255, 250, 241, .5); font: 500 9px/1 var(--mono); text-transform: uppercase; }
.kappa-readout strong { display: block; margin: 5px 0; font: 450 48px/1 var(--serif); }
.kappa-readout p { margin: 0; color: rgba(255, 250, 241, .64); font-size: 11px; line-height: 1.5; }
.cost-pipeline { margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; list-style: none; }
.cost-pipeline li { padding: 8px 8px 8px 0; display: grid; grid-template-columns: 20px 1fr; gap: 7px; border-bottom: 1px solid var(--line-dark); }
.cost-pipeline li:nth-child(even) { padding-left: 8px; border-left: 1px solid var(--line-dark); }
.cost-pipeline li > span { width: 19px; height: 19px; display: grid; place-items: center; border: 1px solid rgba(255, 250, 241, .24); border-radius: 50%; color: var(--gold); font: 500 8px/1 var(--mono); }
.cost-pipeline p { margin: 1px 0 0; color: rgba(255, 250, 241, .7); font-size: 10px; line-height: 1.4; }
.buffer { margin: 16px 0 0; padding: 10px; border-radius: 8px; background: rgba(210, 172, 85, .12); color: var(--gold); font: 500 9px/1.4 var(--mono); }
.headline-table { margin-top: 14px; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; }
.headline-table > div { padding: 10px 14px; display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); border-top: 1px solid var(--line); font: 500 11px/1.3 var(--mono); }
.headline-table > div:first-child { border-top: 0; background: #eee5d8; color: var(--red); font-size: 8px; letter-spacing: .06em; text-transform: uppercase; }
.headline-table > div:nth-child(4) { color: var(--red); }

.evidence { max-width: 1500px; margin: 0 auto; padding: clamp(74px, 10vw, 140px) clamp(22px, 7vw, 110px); }
.evidence header { max-width: 1050px; }
.evidence-grid { margin-top: 38px; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.evidence-grid article { min-width: 0; padding: 22px 20px 24px 0; }
.evidence-grid article + article { padding-left: 20px; border-left: 1px solid var(--line); }
.evidence-grid article > span { color: var(--muted); font: 500 8px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.evidence-grid strong { display: block; margin: 14px 0 10px; color: var(--red); font: 500 46px/1 var(--serif); }
.evidence-grid h3 { margin: 0 0 7px; font-size: 14px; }
.evidence-grid p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
details { margin-top: 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
summary { padding: 18px 0; display: flex; justify-content: space-between; align-items: center; cursor: pointer; list-style: none; font-weight: 600; }
summary::-webkit-details-marker { display: none; }
summary i { color: var(--red); font-style: normal; transition: transform 180ms var(--ease-out); }
details[open] summary i { transform: rotate(45deg); }
.limits { padding-bottom: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; }
.limits p { margin: 0; padding: 11px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; line-height: 1.5; }

footer { padding: 24px clamp(20px, 4vw, 64px); display: flex; justify-content: space-between; border-top: 1px solid var(--line); font: 500 9px/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
footer p { margin: 0; }
footer a { color: var(--red); }

@media (hover: hover) and (pointer: fine) {
  .project-nav a:hover { color: var(--red); }
  .paper-button:hover, .nudge-button:hover { background: var(--red-dark); }
  .chain a:hover { color: var(--paper); background: rgba(255, 250, 241, .07); }
  .chain a[aria-current="true"]:hover { color: var(--ink); background: var(--paper); }
  .segmented button:hover:not([aria-selected="true"]) { color: var(--ink); background: rgba(255, 250, 241, .58); }
  .kappa-switch button:hover:not([aria-pressed="true"]) { color: var(--paper); background: rgba(255, 250, 241, .08); }
}

@media (max-width: 1000px) {
  .desk-heading { grid-template-columns: 1fr; gap: 20px; }
  .chain { position: relative; top: auto; }
  .input-workbench, .clock-lab, .cost-layout { grid-template-columns: 1fr; }
  .nudge-lab { grid-template-columns: 1fr auto 1fr; }
  .measured { grid-column: 1 / -1; min-height: 180px; }
  .definition-row { grid-template-columns: 1fr 1fr; }
  .definition-row p { grid-column: 1 / -1; }
  .evidence-grid { grid-template-columns: 1fr 1fr; }
  .evidence-grid article:nth-child(3) { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .evidence-grid article:nth-child(4) { border-top: 1px solid var(--line); }
}

@media (max-width: 680px) {
  .project-nav span { display: none; }
  .hero { min-height: auto; }
  .hero-footer { grid-template-columns: 1fr; gap: 26px; }
  .paper-button { width: 100%; }
  .chain { grid-template-columns: 1fr 1fr; }
  .chain a + a::before { display: none; }
  .desk-surface { border-radius: 18px; }
  .desk-stage { padding: 34px 18px; }
  .desk-stage + .desk-stage::before { left: 18px; }
  .stage-heading { grid-template-columns: 42px 1fr; gap: 12px; }
  .stage-number { width: 38px; height: 38px; }
  .stage-controls { margin-left: 0; }
  .segmented { width: 100%; max-width: none; }
  .segmented button { min-width: 0; flex: 1 1 30%; }
  .definition-row, .scope-note { grid-template-columns: 1fr; gap: 9px; }
  .metric-strip { grid-template-columns: 1fr; }
  .metric-strip div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-dark); }
  .nudge-lab { grid-template-columns: 1fr; }
  .nudge-button { width: 100%; height: auto; min-height: 48px; border-radius: 12px; grid-template-columns: auto auto; }
  .measured { grid-column: auto; }
  .update-readout dl, .cost-pipeline { grid-template-columns: 1fr; }
  .update-readout dl div:nth-child(even), .cost-pipeline li:nth-child(even) { padding-left: 0; border-left: 0; }
  .headline-table > div { grid-template-columns: 1.25fr repeat(3, .75fr); padding: 9px 7px; font-size: 9px; }
  .evidence-grid, .limits { grid-template-columns: 1fr; }
  .evidence-grid article + article, .evidence-grid article:nth-child(4) { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rank-tape i, .clock-plot div::after, summary i { transition-duration: .01ms; }
  .paper-button, .chain a, .segmented button, .kappa-switch button, .nudge-button, .ranking li { transition-property: color, background-color, box-shadow; }
}