:root {
  --paper: #ffffff;
  --surface: #f5f6f7;
  --surface-blue: #f1f5ff;
  --ink: #111111;
  --muted: #5f6368;
  --faint: #777b80;
  --rule: #d7d9dc;
  --rule-dark: #8d9197;
  --blue: #0969da;
  --blue-dark: #064caa;
  --warm: #a74419;
  --max-width: 1120px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 Arial, Helvetica, sans-serif;
}

h1, h2, h3, h4, p { margin-top: 0; }

h1, h2, h3, h4 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  line-height: 1.06;
}

a { color: var(--blue); }

button, input, textarea, select { font: inherit; }

button, summary, input[type="range"] { cursor: pointer; }

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 18px;
  top: -60px;
  z-index: 10;
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
}

.skip-link:focus { top: 12px; }


.page-shell {
  width: min(var(--max-width), calc(100% - 56px));
  margin: 0 auto;
}

.intro-section { padding: 54px 0 48px; }

.kicker,
.section-number,
.control-label {
  color: var(--blue);
  font: 700 12px/1.2 var(--mono);
  letter-spacing: 0;
  text-transform: uppercase;
}

.kicker { margin-bottom: 24px; }

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr);
  gap: 68px;
  align-items: end;
}

.intro-grid h1 {
  margin: 0;
  max-width: 760px;
  font-size: 58px;
}

.intro-copy > p {
  margin-bottom: 28px;
  color: #3f4247;
  font: 19px/1.45 Georgia, "Times New Roman", serif;
}

.run-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  border-top: 1px solid var(--ink);
}

.run-summary div { padding: 11px 10px 0 0; }

.run-summary dt {
  color: var(--faint);
  font: 10px/1.2 var(--mono);
  text-transform: uppercase;
}

.run-summary dd {
  margin: 5px 0 0;
  color: var(--ink);
  font: 12px/1.35 var(--mono);
}

.panel { border-top: 1px solid var(--ink); }

.panel { padding: 34px 0 58px; }

.section-heading {
  display: grid;
  grid-template-columns: minmax(250px, .72fr) minmax(360px, 1.28fr);
  gap: 64px;
  align-items: start;
  margin-bottom: 30px;
}

.section-heading > div {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: baseline;
  gap: 14px;
}

.section-number {
  margin: 0;
  color: var(--blue);
}

.section-heading h2 {
  margin: 0;
  font-size: 34px;
}

.section-heading > p,
.section-intro {
  max-width: 660px;
  color: var(--muted);
}

.section-heading > p { margin: 0; }

.scenario-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding: 28px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}

.scenario-controls { grid-column: 1 / -1; margin-bottom: 28px; }

.control-head,
.range-ends {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
}

.control-head > span,
.range-ends {
  color: var(--faint);
  font: 11px/1.3 var(--mono);
}

#anchorRange {
  width: 100%;
  margin: 14px 0 0;
  accent-color: var(--blue);
}

.range-ends { margin-top: 2px; }

.anchor-readout {
  display: grid;
  grid-template-columns: minmax(180px, .34fr) minmax(0, .66fr);
  gap: 20px;
  min-height: 48px;
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

.anchor-readout-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
}

.moment-stepper {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  padding-top: 8px;
}

.moment-stepper button {
  width: 36px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  background: #fff;
  color: var(--ink);
  font: 16px/1 var(--mono);
}

.moment-stepper button:hover { border-color: var(--blue); color: var(--blue); }

.anchor-readout span {
  display: flex;
  gap: 12px;
  align-items: baseline;
  color: var(--muted);
  font: 12px/1.3 var(--mono);
}

.anchor-readout strong {
  color: var(--ink);
  font: 24px/1 Georgia, "Times New Roman", serif;
}

.anchor-readout em {
  align-self: center;
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.prompt-panel {
  width: min(100%, 820px);
  min-width: 0;
}

#scenarioQuestion {
  width: 100%;
  min-height: 114px;
  margin-top: 9px;
  padding: 14px;
  resize: vertical;
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  background: #fff;
  color: var(--ink);
  font: 18px/1.45 Georgia, "Times New Roman", serif;
}

#scenarioQuestion::placeholder { color: #8a8d91; }
.question-note { margin: 7px 0 0; }

.scenario-run-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
}

.primary-action {
  min-height: 40px;
  padding: 9px 15px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  font: 700 12px/1.2 var(--mono);
}

.primary-action {
  background: var(--ink);
  color: #fff;
}

.primary-action:hover { border-color: var(--blue); background: var(--blue); }
button:disabled { cursor: wait; opacity: .55; }

.scenario-status {
  color: var(--warm);
  font: 11px/1.45 var(--mono);
}

.model-load-status {
  min-height: 16px;
  margin: 0 0 14px;
}

.interpretation-result,
#forecastResult { margin-top: 28px; }

.interpretation-card {
  max-width: 700px;
  margin-bottom: 24px;
  padding: 18px 0 16px 18px;
  border-left: 3px solid var(--blue);
}

.interpretation-card.cannot-interpret { border-left-color: var(--warm); }
.interpretation-card .control-label { margin-bottom: 8px; }
.interpretation-card p { margin: 0 0 10px; color: var(--muted); }
.interpretation-card ul { margin: 10px 0 14px; padding-left: 20px; color: var(--ink); }
.interpretation-card li { margin: 5px 0; }

.frontier-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 12px;
}

.frontier-card {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
}

.frontier-card h4 { margin: 0 0 9px; font-size: 18px; }

.forecast-intro {
  max-width: 720px;
  margin-bottom: 18px;
}

.forecast-intro h3 {
  margin: 0 0 6px;
  font-size: 28px;
}

.forecast-intro p {
  margin: 0;
  color: var(--muted);
}

.cascade-result {
  margin: 34px 0 8px;
  padding-top: 30px;
  border-top: 1px solid var(--ink);
}

.cascade-summary {
  max-width: 850px;
  color: var(--ink) !important;
  font: 22px/1.42 Georgia, "Times New Roman", serif;
}

.cascade-path {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 30px 0 18px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule-dark);
  border-bottom: 1px solid var(--rule-dark);
}

.cascade-step {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 20px;
  min-width: 0;
  padding: 18px 24px 22px 0;
}

.cascade-step + .cascade-step {
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.cascade-time {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 0;
  color: var(--blue);
  font: 700 11px/1.2 var(--mono);
  text-transform: uppercase;
}

.cascade-time span {
  color: var(--faint);
  font-weight: 400;
}

.cascade-step h4 {
  margin: 0 0 10px;
  font-size: 23px;
}

.cascade-step div > p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.cascade-method,
.model-signals {
  margin-top: 18px;
}

.cascade-method summary,
.model-signals summary {
  width: fit-content;
  color: var(--blue);
  font: 12px/1.3 var(--mono);
}

.cascade-method p {
  max-width: 760px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.model-signals {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.model-signals > .tiny {
  margin: 10px 0 0;
}

.effect-row {
  display: grid;
  grid-template-columns: minmax(82px, 1fr) minmax(80px, 1.25fr) 38px;
  gap: 8px;
  align-items: center;
  margin: 10px 0;
}

.effect-label {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.2;
  text-align: right;
}

.effect-track {
  position: relative;
  height: 10px;
  background: linear-gradient(to right, transparent 49.7%, var(--rule-dark) 49.7%, var(--rule-dark) 50.3%, transparent 50.3%);
}

.effect-track i {
  position: absolute;
  top: 1px;
  height: 8px;
}

.effect-track i.positive { background: var(--blue); }
.effect-track i.negative { background: #777d84; }

.effect-row strong {
  color: var(--faint);
  font: 10px/1 var(--mono);
  text-align: right;
}

.pair-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
  color: var(--faint);
  font: 10px/1.2 var(--mono);
}

.pair-legend i,
.pair-legend b {
  display: inline-block;
  margin-right: 4px;
  vertical-align: middle;
}

.pair-legend i { width: 10px; height: 6px; }
.pair-legend i.predicted { background: var(--blue); }
.pair-legend i.realized { background: #9ca2a9; }
.pair-legend b.ghost-key { width: 2px; height: 10px; background: var(--warm); }

.pair-row {
  display: grid;
  grid-template-columns: minmax(88px, 120px) 1fr 54px;
  gap: 9px;
  align-items: center;
  margin: 7px 0;
}

.pair-label {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.15;
  text-align: right;
}

.pair-tracks { display: grid; gap: 3px; }

.pair-track {
  position: relative;
  height: 7px;
  overflow: hidden;
  background: #eaebed;
}

.pair-track i { display: block; height: 100%; }
.pair-track i.predicted { background: var(--blue); }
.pair-track i.realized { background: #9ca2a9; }

.pair-track b.ghost {
  position: absolute;
  top: -1px;
  bottom: -1px;
  width: 2px;
  background: var(--warm);
}

.pair-vals { display: grid; font: 10px/1.15 var(--mono); }
.pair-vals strong { color: var(--ink); }
.pair-vals em { color: var(--faint); font-style: normal; }

.tiny {
  max-width: 780px;
  color: var(--faint);
  font-size: 12px;
}

.context-details { margin-top: 14px; }

.context-details summary {
  width: fit-content;
  color: var(--blue);
  font: 12px/1.3 var(--mono);
}

.context-list {
  max-width: 780px;
  max-height: 220px;
  margin: 10px 0 0;
  padding-left: 22px;
  overflow-y: auto;
  color: var(--muted);
  font-size: 12px;
}

.context-list li { margin: 5px 0; }

.link-action {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--blue);
  font: 12px/1 var(--mono);
  text-decoration: underline;
}

.divergence-strip {
  width: fit-content;
  max-width: 100%;
  display: flex;
  align-items: flex-end;
  gap: 18px;
  margin: 12px 0 20px;
  padding: 14px 18px 10px;
  overflow-x: auto;
  border: 1px solid var(--rule);
  background: #fff;
}

.divergence-bar { display: grid; justify-items: center; gap: 4px; }
.divergence-track { width: 20px; height: 74px; display: flex; align-items: flex-end; background: #eaebed; }
.divergence-track i { display: block; width: 100%; background: var(--blue); }
.divergence-h { color: var(--ink); font: 11px/1 var(--mono); }
.divergence-v { color: var(--faint); font: 10px/1 var(--mono); }

.record-panel { padding-top: 38px; }
#proofChart { overflow-x: auto; }

.stacked-area {
  display: block;
  width: 100%;
  min-width: 760px;
  height: auto;
  margin: 10px 0 8px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: #fff;
}

.share-guide { stroke: #d8dade; stroke-width: 1; }
.era-guide { stroke: #fff; stroke-opacity: .38; stroke-width: 1; }
.share-tick,
.era-tick { fill: var(--faint); font: 10px/1 Arial, Helvetica, sans-serif; }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 18px;
  margin: 10px 0 18px;
  color: var(--muted);
  font-size: 11px;
}

.legend-item i {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 5px;
  vertical-align: -1px;
}

.provenance-details {
  margin-top: 28px;
  padding-top: 15px;
  border-top: 1px solid var(--rule);
}

.provenance-details p {
  max-width: 780px;
  color: var(--muted);
  font-size: 12px;
}

.site-footer {
  width: min(var(--max-width), calc(100% - 56px));
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
  padding: 20px 0 42px;
  border-top: 1px solid var(--ink);
  color: var(--faint);
  font: 11px/1.3 var(--mono);
}

.site-footer a { color: var(--blue); text-decoration: none; }

@media (max-width: 900px) {
  .intro-grid,
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  .intro-grid h1 { font-size: 48px; }
  .intro-copy { max-width: 680px; }
  .frontier-grid { grid-template-columns: 1fr; }
  .cascade-path { grid-template-columns: 1fr; }
  .cascade-step { padding: 18px 0 22px; }
  .cascade-step + .cascade-step {
    padding-left: 0;
    border-top: 1px solid var(--rule);
    border-left: 0;
  }
}

@media (max-width: 640px) {
  .page-shell,
  .site-footer { width: min(100% - 32px, var(--max-width)); }
  .intro-section { padding: 38px 0 34px; }
  .intro-grid h1 { font-size: 38px; }
  .run-summary { grid-template-columns: 1fr; }
  .run-summary div { border-bottom: 1px solid var(--rule); padding: 8px 0; }
  .section-heading h2 { font-size: 29px; }
  .scenario-workspace { padding: 18px; }
  .anchor-readout { grid-template-columns: 1fr; gap: 7px; }
  .anchor-readout-row { grid-template-columns: 1fr; }
  .moment-stepper { margin-top: 0; padding-top: 0; }
  .pair-row { grid-template-columns: 82px 1fr 48px; gap: 7px; }
  .scenario-run-row .primary-action { width: 100%; }
}