:root {
  --paper: #eef2f6;
  --surface: #ffffff;
  --ink: #172a3b;
  --muted: #4f6172;
  --line: #cbd5df;
  --blue: #164fb0;
  --blue-soft: #e1eafa;
  --green: #176456;
  --green-soft: #e3f2ed;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", SimSun, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 1rem/1.8 var(--sans); }
.wrap { width: min(76rem, calc(100% - 5rem)); margin-inline: auto; }
a { color: var(--blue); text-underline-offset: .22em; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline-offset: 4px; }
.skip { position: absolute; top: -8rem; left: 1rem; z-index: 5; padding: .7rem 1rem; background: var(--surface); }
.skip:focus { top: 1rem; }
.masthead { min-height: 6.25rem; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); gap: 1rem; }
.wordmark { font: 600 .8rem/1.5 var(--mono); letter-spacing: .06em; color: var(--ink); text-decoration: none; padding-block: .8rem; }
.wordmark span { color: var(--blue); }
.edition { color: var(--muted); font-size: .8rem; }
.intro { padding: 4.6rem 0 3rem; }
.eyebrow { color: var(--blue); font: 600 .75rem/1.6 var(--mono); letter-spacing: .07em; margin: 0 0 1.2rem; }
h1, h2, h3, p { margin-top: 0; }
h1 { font: 500 clamp(2.8rem, 5.6vw, 5.3rem)/1.32 var(--serif); letter-spacing: -.035em; margin-bottom: 2rem; text-wrap: balance; }
h1 span { color: var(--blue); }
.intro-bottom { display: flex; justify-content: space-between; align-items: end; gap: 2rem; }
.lead { max-width: 32rem; color: var(--muted); margin: 0; font-size: 1.1rem; }
.recording-date { text-align: right; margin: 0; font-size: .8rem; color: var(--muted); }
.recording-date strong { color: var(--ink); font-family: var(--mono); font-weight: 500; }
.takeaway { border-left: 4px solid var(--blue); background: var(--blue-soft); padding: 1.7rem 2rem; border-radius: 0 1rem 1rem 0; }
.takeaway .eyebrow { margin-bottom: .45rem; }
.takeaway h2 { font-size: 1.35rem; margin-bottom: .65rem; line-height: 1.6; }
.takeaway p:last-child { margin-bottom: 0; }
.evidence { font-size: .85rem; color: var(--muted); }
.section-nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; border-bottom: 1px solid var(--line); padding-block: 1.2rem; }
.section-nav a { display: inline-flex; align-items: center; min-height: 2.75rem; padding: .25rem .2rem; font-weight: 600; font-size: .9rem; }
.listening-note { margin-top: 1.4rem; font-size: .85rem; color: var(--muted); max-width: 60rem; }
.listening-note p { margin-bottom: .4rem; }
.chapter { padding: 4rem 0; border-bottom: 1px solid var(--line); }
.chapter-heading { display: grid; grid-template-columns: 1.1fr 1fr; gap: 3rem; margin-bottom: 1.7rem; align-items: end; }
.chapter-heading .eyebrow { margin-bottom: .55rem; }
h2 { font: 500 clamp(1.7rem, 2.5vw, 2.25rem)/1.5 var(--serif); text-wrap: balance; }
.chapter-heading h2 { margin-bottom: 0; }
.chapter-heading > p { color: var(--muted); font-size: .9rem; margin: 0; }
.legend { display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; margin-bottom: 1.8rem; font-size: .8rem; color: var(--muted); }
.legend b { display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; margin-right: .5rem; font-family: var(--mono); border: 1px solid var(--line); border-radius: .35rem; color: var(--ink); }
.listening-group + .listening-group { margin-top: 2.8rem; }
.group-header { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: .5rem 2rem; margin-bottom: 1rem; }
.group-header h3 { font-size: 1.05rem; margin: 0; }
.group-header p { color: var(--muted); font-size: .85rem; margin: 0; }
.audio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr)); gap: 1rem; }
.sample { background: var(--surface); border: 1px solid var(--line); border-radius: 1.1rem; padding: 1.4rem; min-width: 0; display: flex; flex-direction: column; }
.sample[data-system="converted"] { border-top: 3px solid var(--green); }
.sample[data-system="fish"], .sample[data-system="base"] { border-top: 3px solid var(--blue); }
.sample-label { font: 600 .7rem/1.5 var(--mono); color: var(--muted); letter-spacing: .03em; margin-bottom: .55rem; }
.sample h4 { font-size: 1.1rem; line-height: 1.5; margin: 0 0 .7rem; overflow-wrap: anywhere; }
.sample h3 { font-size: 1.1rem; line-height: 1.5; margin: 0 0 .7rem; }
.processing { font-size: .8rem; color: var(--muted); margin-bottom: 1rem; }
audio { width: 100%; min-width: 0; height: 54px; margin-top: auto; }
.sample-actions { display: flex; flex-wrap: wrap; gap: .4rem 1rem; align-items: center; padding-top: .6rem; font-size: .8rem; }
.sample-actions a, .sample-actions button { display: inline-flex; align-items: center; justify-content: center; min-height: 2.75rem; }
.sample-actions button { border: 1px solid var(--line); border-radius: .5rem; background: var(--surface); color: var(--ink); font: inherit; padding: .5rem .7rem; cursor: pointer; }
.transcript { border-top: 1px solid var(--line); margin-top: 1rem; padding-top: 1rem; }
.transcript summary { min-height: 2.75rem; cursor: pointer; font-size: .85rem; color: var(--ink); }
.transcript-text { font-size: .9rem; color: var(--muted); white-space: pre-wrap; overflow-wrap: anywhere; }
.playback-error { color: var(--ink); background: var(--blue-soft); padding: .7rem; border-radius: .5rem; font-size: .85rem; }
.empty { padding: 2rem; border: 1px dashed var(--line); border-radius: 1rem; color: var(--muted); background: var(--surface); }
.empty p { margin-bottom: 0; }
.method { display: grid; grid-template-columns: .9fr 1.4fr; gap: 5rem; }
.method > div > p:not(.eyebrow), .method li { color: var(--muted); font-size: .9rem; }
.method-content h3 { font-size: 1rem; margin-bottom: .7rem; }
.method-content h3:not(:first-child) { margin-top: 2rem; }
.method-content p { font-size: .9rem; color: var(--muted); }
.method-content ul { padding-left: 1.3rem; margin-bottom: 0; }
dl { margin: 0; font-size: .85rem; }
dl > div { display: grid; grid-template-columns: minmax(7rem, .7fr) 1.3fr; gap: 1rem; padding-block: .65rem; border-bottom: 1px solid var(--line); }
dt { color: var(--muted); } dd { margin: 0; overflow-wrap: anywhere; }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 2rem; padding-block: 2rem 3rem; font-size: .75rem; color: var(--muted); }
footer p { margin: 0; }
@media (max-width: 48rem) {
  .wrap { width: calc(100% - 2.5rem); }
  .masthead { min-height: 5rem; flex-wrap: wrap; padding-block: 1rem; gap: .2rem 1rem; }
  .intro { padding-top: 3rem; }
  .intro-bottom { display: block; }
  .recording-date { margin-top: 1.5rem; text-align: left; }
  .recording-date br { display: none; } .recording-date strong { margin-left: .7rem; }
  .takeaway { padding: 1.3rem; }
  .chapter { padding-block: 2.8rem; }
  .chapter-heading, .method { grid-template-columns: 1fr; gap: 1rem; }
  .method { gap: 2rem; }
  .sample { padding: 1.1rem; }
  .section-nav { column-gap: 1rem; }
}
@media (prefers-reduced-motion: no-preference) {
  .sample-actions button { transition: background-color 150ms ease; }
  .sample-actions button:hover { background: var(--blue-soft); }
}
@media (forced-colors: active) {
  .sample, .takeaway { border: 1px solid CanvasText; }
}