* { box-sizing: border-box; }
html { color-scheme: light; }
body { margin: 0; background: var(--sa-web-bg); color: var(--sa-web-ink); font: 16px/1.6 var(--sa-sans); }
.page { max-width: 1040px; margin: 0 auto; padding: 28px 40px 20px; }
.masthead { min-height: 64px; display: flex; align-items: flex-start; justify-content: space-between; gap: 28px; border-bottom: 1px solid var(--sa-rule); }
.brand { width: 174px; height: auto; display: block; }
.masthead-label { margin-top: 10px; color: var(--sa-web-muted); font: 500 11px/1.5 var(--sa-label); letter-spacing: .14em; text-transform: uppercase; }
.intro { margin: 30px 0 28px; }
.eyebrow { margin: 0; color: var(--sa-web-muted); font: 500 11px/1.5 var(--sa-label); letter-spacing: .15em; text-transform: uppercase; }
.intro .eyebrow { display: flex; align-items: center; gap: 12px; }
.intro .eyebrow > span { width: 24px; height: 2px; background: var(--sa-green); }
h1 { font: 600 clamp(54px, 7vw, 80px)/1.05 var(--sa-serif); font-optical-sizing: auto; letter-spacing: -.035em; margin: 12px 0 8px; }
.lede { margin: 0; color: var(--sa-web-muted); font-size: 16px; }
.experiment { display: grid; grid-template-columns: minmax(396px, 1fr) 320px; background: var(--sa-web-surface); border: 1px solid var(--sa-rule); }
.drawing-panel { padding: 22px 24px 24px; min-width: 0; }
.panel-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; margin-bottom: 16px; }
h2 { font: 500 18px/1.3 var(--sa-serif); margin: 0; }
.drawing-instruction { color: var(--sa-web-muted); font-size: 11px; }
.canvas-frame { overflow-x: auto; }
canvas { display: block; width: 350px; height: 350px; margin: 0 auto; box-sizing: content-box; border: 1px solid var(--sa-rule); background: var(--sa-web-surface); cursor: crosshair; }
.controls { display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 18px; }
button { min-height: 42px; border: 1px solid transparent; border-radius: 0; padding: 10px 18px; font: 500 13px/1.4 var(--sa-label); cursor: pointer; }
.primary { display: inline-flex; align-items: center; gap: 30px; background: var(--sa-green); color: white; }
.primary:hover { background: var(--sa-green-hover); }
.primary > span { font-size: 17px; line-height: 1; }
.secondary { border-color: var(--sa-rule); color: var(--sa-web-muted); background: transparent; }
.secondary:hover { color: var(--sa-web-ink); border-color: var(--sa-web-muted); }
button:focus-visible { outline: 2px solid var(--sa-green-text); outline-offset: 4px; }
.score-panel { display: flex; flex-direction: column; border-left: 1px solid var(--sa-rule); padding: 28px 26px; }
.score-display { display: flex; align-items: baseline; gap: 5px; margin-top: 37px; color: var(--sa-green); font: 400 64px/1.1 var(--sa-mono); letter-spacing: -.06em; }
#accuracy-unit { font-size: 23px; letter-spacing: -.04em; }
.score-label { margin: 9px 0 30px; font: 400 22px/1.2 var(--sa-serif); }
.statistics { border-top: 1px solid var(--sa-rule); }
.statistics > div { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--sa-rule); }
.stat-label { font-size: 12px; color: var(--sa-web-muted); }
.stat-value { font: 400 16px/1.5 var(--sa-mono); letter-spacing: -.03em; }
.result-guidance { margin: auto 0 0; padding-top: 32px; color: var(--sa-web-muted); font: 400 20px/1.4 var(--sa-serif); }
footer { display: flex; align-items: center; gap: 14px; margin-top: 20px; color: var(--sa-web-muted); }
footer > span:first-child { font: 500 9px/1.5 var(--sa-label); text-transform: uppercase; letter-spacing: .1em; }
.brand-line { font: italic 400 15px/1.5 var(--sa-serif); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }
@media (max-width: 820px) {
  .page { max-width: 610px; padding: 22px 24px; }
  .experiment { grid-template-columns: 1fr; }
  .score-panel { border-left: 0; border-top: 1px solid var(--sa-rule); }
  .score-display { margin-top: 22px; }
  .result-guidance { padding-top: 24px; }
}
@media (max-width: 430px) {
  .page { padding: 18px 12px; }
  .brand { width: 152px; }
  .masthead { gap: 14px; min-height: 62px; }
  .masthead-label { max-width: 108px; text-align: right; font-size: 9px; }
  .intro { margin: 26px 0 24px; }
  .intro .eyebrow { font-size: 9px; letter-spacing: .1em; gap: 9px; }
  .intro .eyebrow > span { width: 16px; }
  h1 { font-size: 54px; }
  .lede { font-size: 14px; }
  .drawing-panel { padding: 18px 5px 20px; }
  .panel-heading { padding: 0 12px; }
  .score-panel { padding: 24px; }
  .controls { gap: 8px; }
  button { padding-inline: 15px; }
}