:root {
  --ink: #162a33;
  --muted: #62727a;
  --line: #d7e1e3;
  --teal: #087c83;
  --teal-dark: #0b5963;
  --teal-soft: #dceff0;
  --paper: #f5f8f8;
  --white: #ffffff;
  --amber: #8a3b12;
  --amber-soft: #fff2cc;
  --shadow: 0 18px 44px rgba(25, 55, 63, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 95% 5%, rgba(8,124,131,.10), transparent 26rem),
    linear-gradient(180deg, #f9fbfb 0%, var(--paper) 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
}
.shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; padding: 3rem 0 2rem; }
.hero { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1.1rem; margin-bottom: 2rem; text-align: center; }
.eyebrow, .section-kicker { margin: 0 0 .45rem; color: var(--teal); font-size: .76rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: none; margin: 0; font-size: clamp(2.2rem, 5vw, 4.2rem); line-height: 1; letter-spacing: -.045em; text-align: center; white-space: nowrap; }
.lede { max-width: 760px; margin: 1.1rem 0 0; color: var(--muted); line-height: 1.65; font-size: 1.05rem; }
.cohort-badge { display: inline-flex; align-items: baseline; justify-content: center; gap: .55rem; min-width: 205px; padding: .72rem 1.1rem; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.78); box-shadow: var(--shadow); }
.cohort-badge span { display: block; color: var(--teal); font-size: .7rem; font-weight: 800; letter-spacing: .12em; }
.cohort-badge strong { display: block; margin: 0; font-size: 1.35rem; }
.cohort-badge small { color: var(--muted); }
.workspace { display: grid; grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr); gap: 1.25rem; }
.panel { border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.92); box-shadow: var(--shadow); }
.inputs, .results { padding: 1.4rem; }
.panel-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1.1rem; }
.panel-heading h2 { margin: 0; font-size: 1.4rem; letter-spacing: -.025em; }
.text-button { color: var(--teal-dark); border: 0; background: transparent; font-weight: 750; cursor: pointer; }
.model-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin: 0 0 1.1rem; padding: 0; border: 0; }
.model-toggle legend { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.model-toggle label { cursor: pointer; }
.model-toggle input { position: absolute; opacity: 0; }
.model-toggle span { display: block; padding: .85rem; border: 1px solid var(--line); border-radius: 14px; transition: .18s ease; }
.model-toggle b, .model-toggle small { display: block; }
.model-toggle small { margin-top: .18rem; color: var(--muted); font-size: .73rem; }
.model-toggle input:checked + span { border-color: var(--teal); background: var(--teal-soft); box-shadow: inset 0 0 0 1px var(--teal); }
.form-grid { display: grid; gap: .85rem; }
.field > span { display: flex; justify-content: space-between; margin-bottom: .35rem; font-size: .84rem; font-weight: 720; }
.field em { color: var(--muted); font-size: .72rem; font-style: normal; font-weight: 600; }
input[type="number"], select { width: 100%; min-height: 46px; padding: .7rem .78rem; color: var(--ink); border: 1px solid #c7d4d7; border-radius: 11px; background: white; font: inherit; }
input:focus, select:focus, button:focus-visible { outline: 3px solid rgba(8,124,131,.22); outline-offset: 2px; }
.score-control { display: grid; grid-template-columns: 1fr 88px; align-items: center; gap: .8rem; }
input[type="range"] { accent-color: var(--teal); width: 100%; }
.hidden { display: none; }
.primary-button { width: 100%; margin-top: 1.15rem; padding: .88rem 1rem; color: white; border: 0; border-radius: 12px; background: var(--teal-dark); font-weight: 800; cursor: pointer; box-shadow: 0 8px 18px rgba(11,89,99,.18); }
.primary-button:hover { background: #064b53; }
.privacy-note, .result-note { margin: .7rem 0 0; color: var(--muted); font-size: .75rem; line-height: 1.5; }
.risk-chip { padding: .38rem .7rem; border-radius: 999px; background: #edf1f2; color: var(--muted); font-size: .74rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.risk-chip.high { color: #9c2f24; background: #fde9e6; }
.risk-chip.low { color: #116149; background: #e2f3ed; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: .65rem; }
.metrics article { padding: .95rem; border: 1px solid var(--line); border-radius: 16px; background: #fbfdfd; }
.metrics span { display: block; color: var(--muted); font-size: .76rem; }
.metrics strong { display: block; margin-top: .25rem; font-size: 1.65rem; letter-spacing: -.04em; }
.score-line { display: flex; justify-content: space-between; margin: 1rem 0; padding: .75rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: .84rem; }
.score-line span { color: var(--muted); }
.survival-figure { margin: 0; }
.survival-figure figcaption { margin-bottom: .4rem; font-size: .85rem; font-weight: 760; }
#survival-chart { width: 100%; height: auto; overflow: visible; }
.chart-axis { stroke: #9aa9ad; stroke-width: 1; }
.chart-grid { stroke: #e5ecee; stroke-width: 1; }
.chart-line { fill: none; stroke: var(--teal); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.chart-area { fill: rgba(8,124,131,.08); }
.chart-text { fill: var(--muted); font-size: 12px; font-family: inherit; }
.evidence-strip { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; margin-top: 1.25rem; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: var(--line); }
.evidence-strip div { padding: 1rem 1.1rem; background: white; }
.evidence-strip span, .evidence-strip b { display: block; }
.evidence-strip span { margin-bottom: .25rem; color: var(--muted); font-size: .72rem; }
.evidence-strip b { font-size: .9rem; }
.model-specification { margin-top: 1.25rem; }
.model-specification details { overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.84); box-shadow: 0 10px 28px rgba(25,55,63,.045); }
.model-specification summary { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: 1rem 1.15rem; cursor: pointer; list-style: none; font-size: .95rem; font-weight: 820; }
.model-specification summary::-webkit-details-marker { display: none; }
.model-specification summary::after { content: "+"; color: var(--teal); font-size: 1.25rem; font-weight: 500; }
.model-specification details[open] summary { border-bottom: 1px solid var(--line); }
.model-specification details[open] summary::after { content: "-"; }
.model-specification summary small { color: var(--muted); font-size: .75rem; font-weight: 650; }
.spec-content { padding: 1.15rem; }
.spec-intro, .spec-note { margin: 0; color: var(--muted); font-size: .84rem; line-height: 1.6; }
.spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin: 1rem 0; }
.spec-grid article { padding: .9rem; border: 1px solid var(--line); border-radius: 14px; background: #fbfdfd; }
.spec-grid p { margin: 0; font-size: .82rem; line-height: 1.55; }
.spec-label { margin-bottom: .28rem !important; color: var(--teal-dark); font-size: .86rem !important; font-weight: 820; }
.formula-card { margin: 1rem 0; padding: 1rem; border-left: 3px solid var(--teal); border-radius: 0 12px 12px 0; background: #f5faf9; }
.formula-card p { margin: .4rem 0 0; font-family: "Cambria Math", Cambria, Georgia, serif; font-size: .86rem; line-height: 1.65; overflow-wrap: anywhere; }
.formula-card .formula-label { margin: 0; color: var(--teal-dark); font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-size: .72rem; font-weight: 820; letter-spacing: .08em; text-transform: uppercase; }
@media (max-width: 860px) {
  .workspace { grid-template-columns: 1fr; }
  .evidence-strip { grid-template-columns: 1fr; }
  .spec-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .shell { width: min(100% - 1rem, 1180px); padding-top: 1.7rem; }
  h1 { font-size: 2.2rem; white-space: normal; }
  .inputs, .results { padding: 1rem; border-radius: 18px; }
  .metrics { grid-template-columns: 1fr; }
  .model-toggle { grid-template-columns: 1fr; }
}