:root {
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  color: #13233a;
  background: #f4f7f9;
  --ink: #13233a;
  --muted: #526276;
  --blue: #245c88;
  --green: #3c7555;
  --line: #d4dee7;
  --surface: #ffffff;
  --result-surface: #fbfdff;
}
* { box-sizing: border-box; }
body { margin: 0; }
main { width: min(1160px, calc(100% - 40px)); margin: 0 auto; padding: 56px 0 72px; }
header { max-width: 760px; margin-bottom: 36px; }
h1 { margin: 0; font-size: clamp(2.75rem, 6vw, 4.6rem); line-height: .98; letter-spacing: -.045em; }
h2 { margin-top: 0; }
header > p:last-child, .method p { color: #526276; font-size: 1.08rem; }
.eyebrow { margin: 0 0 12px; color: var(--green); font-weight: 800; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }
.calculator { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }
.controls, .result { border-radius: 14px; }
.controls { padding: clamp(18px, 2.5vw, 26px); background: var(--surface); border: 1px solid var(--line); }
.result { padding: clamp(24px, 3vw, 36px); background: var(--result-surface); border: 2px solid var(--blue); box-shadow: 0 20px 48px #1220331a; }
.controls { display: grid; gap: 16px; align-content: start; }
#preset { width: fit-content; max-width: 100%; }
label, fieldset { display: grid; gap: 6px; font-weight: 700; font-size: .92rem; }
.parameters { border-top: 1px solid var(--line); }
.parameters summary { padding: 16px 0 0; color: var(--blue); font-weight: 750; cursor: pointer; }
.parameter-fields { display: grid; gap: 16px; padding-top: 16px; }
input, select { width: 100%; min-height: 42px; padding: 8px 10px; color: inherit; font: inherit; border: 1px solid #b7c5d1; border-radius: 6px; }
label small { color: #526276; font-weight: 400; }
fieldset { padding: 12px; border: 1px solid #d4dee7; border-radius: 6px; }
fieldset label { display: flex; align-items: center; font-weight: 500; }
fieldset input { width: 18px; min-height: 18px; }
.chart-options { margin-top: 24px; }
.chart-options summary { padding: 14px 0; color: var(--blue); font-size: .92rem; font-weight: 750; cursor: pointer; }
.chart-option-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; padding: 0 0 16px; }
.chart-option-fields label { display: grid; align-items: normal; font-weight: 700; }
.result { min-width: 0; max-width: 100%; }
.result .eyebrow { color: var(--blue); }
.result h2 { margin: 0; font-size: clamp(2.5rem, 5vw, 4rem); }
#answerDetail { min-height: 50px; max-width: 70ch; color: var(--muted); font-size: 1.06rem; line-height: 1.55; }
#chart { display: block; width: 100%; max-width: 100%; max-height: 440px; }
.preset-assumptions { color: #526276; font-size: .9rem; }
.preset-assumptions h3 { margin: 0 0 8px; color: #13233a; font-size: 1rem; }
.preset-assumptions ul { margin: 0; padding-left: 20px; }
.preset-assumptions p { margin: 10px 0 0; }
.method { max-width: 820px; margin-top: 56px; padding-top: 22px; border-top: 1px solid #cfd9e1; }
.method summary { color: #13233a; font-size: 1.7rem; font-weight: 800; cursor: pointer; }
.method-content { padding-top: 12px; }
.distribution-assumptions { display: grid; gap: 16px; margin-top: 30px; }
.distribution-assumptions h2 { margin-bottom: 0; }
code { padding: 2px 4px; background: #e8edf1; border-radius: 3px; }
.caveat { color: var(--muted) !important; font-weight: 650; }
a { color: #245c88; }
@media (max-width: 800px) {
  main { width: min(100% - 28px, 1160px); padding: 36px 0; }
  .chart-option-fields { grid-template-columns: 1fr; }
}