:root {
  color-scheme: light;
  font-family: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: #152637;
  background: #f6f8fa;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { min-height: 100vh; margin: 0; display: flex; flex-direction: column; }
[hidden] { display: none !important; }
a { color: #215185; text-underline-offset: .2em; }
a:focus-visible { outline: 3px solid #316db1; outline-offset: 4px; }
.wrap { width: min(100% - 40px, 880px); margin-inline: auto; }
.topbar { border-bottom: 1px solid #dae2e9; background: #fff; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; }
.brand { color: inherit; font-weight: 700; text-decoration: none; }
.domain { color: #556577; font-size: .85rem; }
main { flex: 1; padding-bottom: 56px; }
.intro { padding: clamp(46px, 9vw, 88px) 0 36px; }
.eyebrow { margin: 0 0 12px; color: #245387; font-size: .76rem; font-weight: 700; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.1rem); letter-spacing: .03em; line-height: 1.2; }
h2 { margin: 0 0 14px; font-size: 1.18rem; }
h3 { margin: 0 0 6px; font-size: 1.16rem; }
p { line-height: 1.7; }
.lede { margin: 16px 0 0; color: #44566a; }
.experiments { margin: 0; padding: 0; list-style: none; }
.experiment { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 16px; padding: 22px; border: 1px solid #ccd9e5; border-radius: 12px; background: #fff; color: inherit; text-decoration: none; }
.experiment:hover { border-color: #4574a6; background: #f9fcff; }
.experiment p { margin: 0; color: #44566a; font-size: .93rem; }
.index { font-variant-numeric: tabular-nums; font-weight: 700; color: #27578b; padding: 10px; border-radius: 7px; background: #e8f0f9; }
.view { color: #215185; white-space: nowrap; font-size: .9rem; font-weight: 600; }
.back { display: inline-block; margin-top: 28px; }
.detail { padding-top: 35px; }
.instructions { background: #fff; border: 1px solid #ccd9e5; border-radius: 12px; padding: 24px; }
.instructions p { margin: 0; color: #44566a; }
.button { display: inline-flex; align-items: center; gap: 12px; margin-top: 20px; padding: 11px 18px; border-radius: 7px; background: #214e80; color: #fff; text-decoration: none; font-weight: 650; }
.button:hover { background: #193e69; }
.instructions .status { margin-top: 18px; font-size: .9rem; }
.footer { display: flex; flex-wrap: wrap; gap: 10px 20px; padding-block: 20px; border-top: 1px solid #dae2e9; color: #536477; font-size: .85rem; }
@media (max-width: 520px) {
  .experiment { grid-template-columns: auto 1fr; gap: 12px; padding: 16px; }
  .view { grid-column: 2; }
  .instructions { padding: 18px; }
}