:root {
  color-scheme: light;
  --ground: #f2f4f7;
  --surface: #ffffff;
  --raised: #eeeeee;
  --border: #e6e6e6;
  --rule: #f0f0f0;
  --control: #888888;
  --text: #0a0a0a;
  --muted: #595959;
  --accent: #141414;
  --negative: #c4242a;
  --data: #1d5fbf;
  --radius: 8px;
  --control-radius: 6px;
  --gap: 12px;
  --pad: 24px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --scroll-thumb: #888888;
  --scroll-track: #eeeeee;
  --scroll-hover: #595959;
}
* { box-sizing: border-box; scrollbar-width: thin; scrollbar-color: var(--scroll-thumb) var(--scroll-track); }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: var(--scroll-track); }
*::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: var(--control-radius); }
*::-webkit-scrollbar-thumb:hover { background: var(--scroll-hover); }
*::-webkit-scrollbar-thumb:active { background: var(--accent); }
html { scrollbar-gutter: stable; }
body { margin: 0; color: var(--text); background: var(--ground); font: 16px/1.5 var(--font); }
a { color: inherit; text-underline-offset: 4px; }
a, button, select, input[type=radio], label:has(input[type=radio]) { cursor: pointer; }
button, input, select { font: inherit; }
:focus-visible { outline: 3px solid var(--data); outline-offset: 3px; }
.skip { position: absolute; left: 12px; top: -80px; background: var(--surface); padding: 12px; z-index: 2; }
.skip:focus { top: 8px; }
/* 216px navigation + 40px gutter + flexible content; all children close on the same outer edges. */
.shell { max-width: 1400px; margin: auto; padding: 36px; display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 40px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-size: 20px; font-weight: 600; min-height: 44px; }
.brand svg { width: 30px; height: 30px; }
.nav-label { color: var(--muted); margin: 40px 10px 12px; font-size: 14px; }
nav { display: grid; gap: 4px; }
nav a { display: flex; align-items: center; min-height: 44px; padding: 8px 10px; text-decoration: none; border-radius: var(--control-radius); }
nav a[aria-current] { background: var(--raised); font-weight: 500; }
nav a:hover { background: var(--surface); }
nav a:active { background: var(--raised); }
.sidebar-note { margin: 40px 10px 0; color: var(--muted); font-size: 14px; max-width: 175px; }
main { min-width: 0; }
h1 { margin: 0 0 24px; font-size: 30px; font-weight: 500; letter-spacing: -0.035em; line-height: 1.15; }
h2 { font-size: 18px; font-weight: 500; margin: 0; }
p { margin: 0; }
.workspace { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: var(--gap); align-items: start; }
.calculator-panel { padding: var(--pad); background: var(--surface); border-radius: var(--radius); min-width: 0; }
.intro { margin-bottom: 24px; }
.intro strong { font-weight: 500; }
fieldset { padding: 0; border: 0; margin: 0 0 24px; }
legend { font-size: 14px; color: var(--muted); margin-bottom: 8px; }
.modes { display: flex; flex-wrap: wrap; gap: 8px; }
.modes label { display: flex; align-items: center; gap: 7px; min-height: 44px; padding: 8px 12px; background: var(--ground); border-radius: var(--control-radius); }
.modes label:has(:checked) { background: var(--raised); }
input[type=radio] { accent-color: var(--accent); width: 16px; height: 16px; margin: 0; }
.inputs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gap); }
.field label { display: block; margin-bottom: 8px; font-size: 14px; }
input[type=text], select { width: 100%; min-width: 0; min-height: 46px; border: 1px solid var(--control); border-radius: var(--control-radius); background: var(--surface); color: var(--text); padding: 10px; font-variant-numeric: tabular-nums; }
input[type=text] { cursor: text; }
input::placeholder { color: var(--muted); font-size: 14px; }
input:disabled { color: var(--muted); background: var(--ground); border-color: var(--border); cursor: not-allowed; }
input[aria-invalid=true] { border-color: var(--negative); }
.field select { margin-top: 8px; font-size: 14px; }
.field-help { font-size: 12px; color: var(--muted); display: block; padding-top: 8px; }
.actions { display: flex; gap: 8px; margin-top: 24px; }
button { border: 0; border-radius: var(--control-radius); padding: 12px 18px; min-height: 46px; background: var(--accent); color: var(--surface); transition: transform 120ms ease, opacity 120ms ease; }
button:hover { opacity: .85; }
button:active { transform: translateY(1px); }
button.secondary { background: var(--raised); color: var(--text); }
#error { min-height: 48px; padding-top: 12px; color: var(--negative); font-size: 14px; }
.result-area { min-height: 164px; padding-top: 20px; }
#empty-result { color: var(--muted); padding-top: 12px; }
#result-label { font-size: 14px; color: var(--muted); }
#result-value { font-size: 36px; font-weight: 500; letter-spacing: -.04em; font-variant-numeric: tabular-nums; margin: 4px 0 12px; overflow-wrap: anywhere; }
#result-summary { font-size: 14px; font-variant-numeric: tabular-nums; }
#result-equation { color: var(--muted); font-size: 12px; margin-top: 12px; }
/* Static answer block: only the race pages with answer tables render an .answer section. */
.answer { margin-bottom: 24px; background: var(--surface); padding: var(--pad); border-radius: var(--radius); overflow-x: auto; }
.answer .lead { max-width: 62ch; margin-bottom: 16px; }
.answer h2 { margin-bottom: 10px; }
.answer h2 + table { margin-top: 0; }
.answer h2:not(:first-of-type) { margin-top: 24px; }
.answer th, .answer td { padding: 9px 8px; }
.answer table { margin-bottom: 8px; }
.answer .answer-more { margin-top: 14px; }
.answer .answer-more a { display: inline-flex; align-items: center; min-height: 44px; }
/* Long-form text on the About, Privacy and Contact pages. */
.prose h2 { margin-top: 26px; }
.prose p { margin-top: 10px; }
.notes { padding: 8px 0 0 12px; font-size: 14px; }.notes h2 { font-size: 16px; margin-bottom: 10px; }
.notes p + h2 { margin-top: 28px; }
.notes p { color: var(--muted); }
.notes a { display: inline-flex; align-items: center; min-height: 44px; }
.splits { margin-top: 12px; background: var(--surface); padding: var(--pad); border-radius: var(--radius); }
.split-heading { display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.split-heading label { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.split-heading select { width: auto; }
#split-summary { margin-top: 12px; font-size: 14px; color: var(--muted); }
.table-wrap { margin-top: 20px; overflow: auto; max-height: 470px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: 14px; }
caption { text-align: left; color: var(--muted); padding-bottom: 12px; font-size: 12px; }
th { font-weight: 400; color: var(--muted); }
th, td { text-align: right; padding: 12px 8px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
.finish td { font-weight: 500; color: var(--data); }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin: 28px 0; font-size: 12px; color: var(--muted); }
[hidden] { display: none !important; }
@media (max-width: 1100px) {
  .shell { padding: 28px; grid-template-columns: 180px minmax(0, 1fr); gap: 28px; }
  .workspace { grid-template-columns: 1fr; }
  .notes { padding: 20px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
}
@media (max-width: 700px) {
  .shell { padding: 16px; display: block; }
  .brand { font-size: 18px; }
  .nav-label, .sidebar-note { display: none; }
  nav { display: flex; gap: 4px; overflow-x: auto; margin: 12px 0 24px; }
  nav a { flex: 0 0 auto; font-size: 14px; padding: 8px 12px; }
  h1 { font-size: 26px; margin-bottom: 20px; }
  .calculator-panel, .splits { padding: 18px; }
  .inputs { grid-template-columns: 1fr; gap: 16px; }
  .field { display: grid; grid-template-columns: minmax(0, 1fr) 120px; column-gap: 8px; align-items: center; }
  .field label { grid-column: 1 / -1; }
  .field select { margin: 0; }
  .field-help { padding: 0 0 0 4px; }
  .notes { gap: 20px; }
  .notes p { font-size: 14px; }
  .modes { gap: 5px; }
  .modes label { padding: 8px 10px; font-size: 14px; }
  .result-area { min-height: 164px; }
  #result-value { font-size: 32px; }
  .split-heading { align-items: start; }
  .split-heading label { flex-direction: column; gap: 4px; align-items: start; }
}
@media (max-width: 360px) { .notes { grid-template-columns: 1fr; } .actions button { padding: 12px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }
@media (forced-colors: active) { * { scrollbar-color: auto; } }