:root {
  color-scheme: light dark;
  --page: #faf9fc;
  --surface: #ffffff;
  --ink: #24212b;
  --muted: #595561;
  --line: #dad7e0;
  --accent: #593d78;
  --accent-ink: #fff;
  --tint: #f2eef6;
  --track: #dcd3e6;
  --pause: #9775b3;
  --end: #604075;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 100%;
  background: var(--page);
  color: var(--ink);
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #19171d; --surface: #221f27; --ink: #efedf2; --muted: #c0b9c8;
    --line: #423b49; --accent: #d1b6ee; --accent-ink: #271b35; --tint: #2c2535;
    --track: #44394f; --pause: #9372ac; --end: #c2a0dc;
  }
}
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.6; }
h1, h2, h3, p, dl, dd { margin: 0; }
h1, h2, h3 { line-height: 1.22; text-wrap: balance; }
h1 { max-width: 20ch; font-size: clamp(1.9rem, 3.4vw, 2.55rem); font-weight: 650; letter-spacing: -.045em; }
h2 { font-size: clamp(1.4rem, 2.2vw, 1.75rem); font-weight: 610; letter-spacing: -.035em; }
h3 { font-size: 1.06rem; font-weight: 650; }
p { max-width: 66ch; }
a { color: var(--accent); text-underline-offset: .2em; }
a:hover { text-decoration: underline; }
:where(a, select):focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.wrap { max-width: 70rem; margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 3.25rem); }
.skip { position: absolute; top: -5rem; left: 1rem; z-index: 2; background: var(--surface); padding: .5rem 1rem; }
.skip:focus { top: .5rem; }
.top { display: flex; justify-content: space-between; align-items: center; gap: 1.25rem; min-height: 4.75rem; }
header { border-bottom: 1px solid var(--line); }
.brand, nav, .actions, .foot-links { display: flex; align-items: center; }
.brand { gap: .65rem; color: var(--ink); font-size: 1.08rem; font-weight: 650; letter-spacing: -.03em; text-decoration: none; }
.brand img { display: block; width: 2.1rem; height: 2.1rem; }
nav { gap: clamp(1rem, 3vw, 2rem); font-size: .96rem; }
nav a, footer a { color: var(--muted); text-decoration: none; }
.language { border-inline-start: 1px solid var(--line); padding-inline-start: clamp(1rem, 2.5vw, 1.6rem); }
.hero { display: grid; grid-template-columns: 1.08fr 1fr; align-items: center; gap: clamp(2rem, 5vw, 5rem); padding-block: clamp(3.5rem, 7vw, 6rem); }
.eyebrow, .section-tag { color: var(--accent); font-size: .88rem; font-weight: 620; }
.eyebrow { margin-block-end: .85rem; }
.lead { color: var(--muted); font-size: 1.1rem; line-height: 1.65; margin-top: 1.1rem; max-width: 42ch; }
.actions { flex-wrap: wrap; gap: .9rem 1.2rem; margin-top: 1.65rem; }
.button { display: inline-flex; align-items: center; padding: .56rem 1.1rem; border-radius: .55rem; background: var(--accent); color: var(--accent-ink); font-weight: 600; text-decoration: none; }
.button:hover { text-decoration: none; filter: brightness(1.12); }
.text-link { font-weight: 560; }
.preview { min-width: 0; padding: clamp(1.2rem, 3vw, 1.75rem); border: 1px solid var(--line); border-radius: 1.1rem; background: var(--surface); }
.preview h2 { font-size: 1.14rem; letter-spacing: -.02em; }
.capacity { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-top: 1rem; color: var(--muted); font-size: .95rem; }
select { font: inherit; font-weight: 600; color: var(--ink); border: 1px solid var(--line); border-radius: .45rem; background-color: var(--surface); padding: .28rem .45rem; max-width: 100%; }
.track { display: grid; grid-template-columns: 4fr 1fr 3fr; height: .7rem; margin-top: 1.15rem; gap: 2px; border-radius: .35rem; overflow: hidden; }
.track i:nth-child(1) { background: var(--track); }
.track i:nth-child(2) { background: var(--pause); }
.track i:nth-child(3) { background: var(--end); }
.scale { display: flex; justify-content: space-between; color: var(--muted); font-size: .85rem; margin-top: .2rem; }
.readings { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 1.2rem; }
.readings > div + div { border-inline-start: 1px solid var(--line); padding-inline-start: 1.1rem; }
.readings dt { color: var(--muted); font-size: .94rem; }
.readings dd { color: var(--accent); font-variant-numeric: tabular-nums; font-size: 1.5rem; line-height: 1.5; font-weight: 620; letter-spacing: -.035em; }
.readings dd small { font-size: .97rem; font-weight: 480; letter-spacing: 0; }
.section { display: grid; grid-template-columns: minmax(11rem, 1fr) minmax(0, 2.3fr); gap: 2.25rem; padding-block: clamp(2.2rem, 4.8vw, 3.65rem); border-top: 1px solid var(--line); }
.section h2 { margin-top: .4rem; }
.section-tag { font-variant-numeric: tabular-nums; }
.copy { display: grid; gap: .9rem; align-content: start; }
.copy p { color: var(--muted); }
.steps { list-style: none; padding: 0; margin: .25rem 0 0; }
.steps li { display: grid; grid-template-columns: minmax(5rem, auto) 1fr; align-items: baseline; gap: 1rem; padding: .65rem 0; border-top: 1px solid var(--line); }
.steps strong { font-size: .97rem; font-weight: 650; }
.steps span { color: var(--muted); }
.code { margin: .2rem 0; padding: .9rem 1rem; border-radius: .6rem; overflow-x: auto; color: var(--ink); background: var(--tint); font-size: .94rem; line-height: 1.65; }
code { font-family: ui-monospace, monospace; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
.footer-inner, .foot-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem 1.3rem; }
.footer-inner { padding-block: 1.35rem; }
:lang(zh-CN) h1, :lang(zh-CN) h2 { letter-spacing: -.015em; }
@media (max-width: 46rem) {
  .hero { grid-template-columns: 1fr; gap: 2rem; }
  .lead { max-width: 56ch; }
  .section { grid-template-columns: 1fr; gap: 1.1rem; }
  .section-heading { display: flex; align-items: baseline; gap: .8rem; }
  .section h2 { margin: 0; }
}
@media (max-width: 32rem) {
  .top { flex-wrap: wrap; gap: .5rem; padding-block: .8rem; }
  .brand { font-size: 1rem; }
  nav { gap: .75rem; font-size: .9rem; flex-wrap: wrap; }
  .language { padding-inline-start: .75rem; }
  .steps li { grid-template-columns: 1fr; gap: .2rem; }
  .hero { padding-block: 2.6rem; }
}
[hidden] { display: none !important; }
.preview-note { margin-top: .95rem; font-size: .88rem; color: var(--muted); }