:root {
  color-scheme: light;
  --canvas: #fff;
  --worksheet: #f3f5f8;
  --ink: #232b36;
  --muted: #566170;
  --line: #cdd3dc;
  --accent: #493bc3;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-variant-numeric: tabular-nums;
  line-height: 1.55;
}
* { box-sizing: border-box; }
body { margin: 0; }
[hidden] { display: none !important; }
.wrap { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
a { color: inherit; text-underline-offset: 4px; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
.skip-link { position: absolute; left: 12px; top: -100px; padding: 12px 18px; background: var(--ink); color: white; z-index: 2; }
.skip-link:focus { top: 12px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 16px; border-bottom: 1px solid var(--line); }
.wordmark { font-weight: 750; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
nav a, .wordmark { display: inline-flex; align-items: center; min-height: 44px; }
.intro { padding-block: 24px; }
h1 { font-size: clamp(2rem, 5vw, 2.75rem); line-height: 1.1; letter-spacing: -.035em; margin: 0 0 12px; }
h2 { font-size: 1.25rem; line-height: 1.3; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 0 0 12px; }
p { margin: 0 0 12px; max-width: 72ch; }
.worksheet { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); border: 1px solid var(--line); border-radius: 12px; overflow: clip; }
form { background: var(--worksheet); padding: 24px; border-right: 1px solid var(--line); }
.field { display: grid; gap: 6px; margin-top: 16px; }
label, legend { font-weight: 650; }
input, select, button, textarea { font: inherit; color: inherit; max-width: 100%; min-width: 0; }
input:not([type="checkbox"]), select, textarea { width: 100%; border: 1px solid var(--muted); background: var(--canvas); border-radius: 6px; min-height: 44px; padding: 9px 12px; font-variant-numeric: tabular-nums; }
input:disabled { opacity: .65; }
.hint { color: var(--muted); font-size: .875rem; font-weight: 400; }
.error { font-size: .875rem; font-weight: 650; }
.error:empty { display: none; }
[aria-invalid="true"] { border: 2px solid var(--ink) !important; }
.check { display: flex; align-items: center; gap: 12px; min-height: 44px; font-size: .875rem; margin-top: 12px; cursor: pointer; }
.check input { width: 24px; height: 24px; flex: 0 0 24px; accent-color: var(--ink); }
fieldset { border: 1px solid var(--line); min-width: 0; padding: 12px; margin: 16px 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
button { min-height: 44px; padding: 10px 18px; border: 1px solid var(--ink); border-radius: 6px; background: var(--ink); color: var(--canvas); cursor: pointer; font-weight: 650; }
button + button { color: var(--ink); background: var(--canvas); }
button:hover { text-decoration: underline; text-underline-offset: 3px; }
button:disabled { opacity: .6; cursor: not-allowed; }
.privacy-note { margin-top: 12px; }
#copy-status { font-size: .875rem; }
#manual-copy label { display: block; margin-block: 12px 6px; }
.ledger { padding: 24px 32px; min-width: 0; }
.ratio-line { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 16px; padding-block: 8px; }
#ratio { font-size: clamp(3rem, 6vw, 4rem); font-weight: 750; line-height: 1.2; letter-spacing: -.045em; }
#percent { font-size: 1.25rem; color: var(--muted); }
.formula { background: var(--worksheet); border-left: 2px solid var(--line); padding: 12px; font-variant-numeric: tabular-nums; font-size: .9375rem; }
.result-rows { margin: 24px 0 8px; }
.result-rows > div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; border-top: 1px solid var(--line); padding-block: 12px; }
dt { font-size: .9375rem; }
dd { margin: 0; text-align: right; font-weight: 650; }
.margin-results { margin-top: 32px; }
.break-even-marker { color: var(--accent); border-left: 3px solid var(--accent); padding-left: 12px; }
.state { font-weight: 650; }
.model-note { margin-top: 24px; }
.sensitivity { grid-column: 1 / -1; padding: 24px; border-top: 1px solid var(--line); min-width: 0; }
table { border-collapse: collapse; width: 100%; table-layout: fixed; font-size: .9375rem; }
caption { text-align: left; font-size: .875rem; color: var(--muted); padding-bottom: 16px; }
th, td { text-align: right; padding: 12px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th:first-child, td:first-child { text-align: left; width: 18%; }
td .table-state { display: block; font-size: .8125rem; font-weight: 650; }
main, section, form, p, output, dd, td, th, span { overflow-wrap: anywhere; }
.guide { max-width: 76ch; margin: 48px auto; }
.guide section { margin-block: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.guide section > p { margin-bottom: 16px; }
.guide a { display: inline-block; min-height: 44px; padding-block: 10px; }
details { border-top: 1px solid var(--line); }
summary { min-height: 44px; padding: 14px 0; font-weight: 650; cursor: pointer; }
details p { padding-block: 4px 16px; }
footer { border-top: 1px solid var(--line); padding-block: 24px; color: var(--muted); font-size: .875rem; }
footer a { display: inline-flex; align-items: center; min-width: 44px; min-height: 44px; }
.notice { padding: 16px; border: 1px solid var(--ink); }
@media (max-width: 799px) {
  .worksheet { grid-template-columns: minmax(0, 1fr); }
  form { border-right: 0; border-bottom: 1px solid var(--line); }
  .ledger { padding: 24px; }
}
@media (max-width: 480px) {
  .wrap { width: calc(100% - 32px); }
  .topbar { flex-wrap: wrap; gap: 0 16px; }
  .intro { padding-block: 20px; }
  form, .ledger, .sensitivity { padding: 16px; }
  th, td { padding: 12px 4px; font-size: .8125rem; }
  .result-rows > div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  dd { text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}