:root {
  color-scheme: light;
  --midnight: #0b1633;
  --midnight-soft: #14234a;
  --paper: #f5f4ef;
  --surface: #ffffff;
  --ink: #14203a;
  --body: #3f4b61;
  --muted: #6e7788;
  --line: #dfe2df;
  --mint: #43d6bd;
  --teal: #128c7b;
  --coral: #ff8a68;
  --violet: #8d7ad1;
  --shadow: 0 18px 50px rgba(11, 22, 51, .07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, select { font: inherit; }
button { cursor: pointer; }
a { color: var(--teal); }
a:hover { color: var(--midnight); }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 4px; }
[hidden] { display: none !important; }
.page-shell { max-width: 1440px; margin: auto; }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(20px, 4vw, 60px);
  border-bottom: 1px solid rgba(11, 22, 51, .08);
  background: rgba(245, 244, 239, .9);
  backdrop-filter: blur(18px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--midnight);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -.025em;
  text-decoration: none;
  white-space: nowrap;
}
.brand img { width: 36px; height: 36px; object-fit: contain; }
.chapter-nav { display: flex; justify-content: center; gap: 6px; }
.chapter-nav a {
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: .8rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}
.chapter-nav a:hover { background: rgba(11, 22, 51, .06); color: var(--midnight); }
.header-actions { display: flex; align-items: center; gap: 18px; }
.readme-link { color: var(--midnight); font-size: .82rem; font-weight: 750; text-decoration: none; white-space: nowrap; }
.language-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}
.language-switch button {
  min-width: 50px;
  padding: 5px 10px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 750;
  transition: background-color 160ms ease, color 160ms ease;
}
.language-switch button[aria-pressed="true"] { background: var(--midnight); color: #fff; }

main { padding: 24px clamp(20px, 4vw, 60px) 64px; }
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, .88fr);
  align-items: center;
  gap: clamp(36px, 5vw, 74px);
  margin: 0 0 72px;
  padding: clamp(42px, 5vw, 68px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 28px;
  background:
    radial-gradient(circle at 86% 12%, rgba(67, 214, 189, .18), transparent 34%),
    linear-gradient(125deg, var(--midnight) 0%, #101e41 58%, #152a50 100%);
  box-shadow: 0 26px 70px rgba(11, 22, 51, .16);
}
.hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .025) 1px, transparent 1px);
  background-size: 34px 34px;
  content: "";
  mask-image: linear-gradient(90deg, transparent, #000);
}
.hero-copy { position: relative; z-index: 1; max-width: 720px; }
.eyebrow {
  margin: 0 0 9px;
  color: var(--teal);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.hero .eyebrow { color: var(--mint); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 {
  max-width: 690px;
  margin-bottom: 20px;
  color: #f7faf9;
  font-size: clamp(2.7rem, 4.7vw, 4.65rem);
  line-height: 1.04;
  letter-spacing: -.055em;
}
.hero-lead { max-width: 630px; margin-bottom: 28px; color: #bdc9dc; font-size: 1rem; line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-bottom: 26px; }
.hero-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: .85rem;
  font-weight: 750;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}
.hero-actions a:hover { transform: translateY(-2px); }
.primary-action { background: var(--mint); color: var(--midnight); }
.primary-action:hover { background: #73e4d1; color: var(--midnight); }
.secondary-action { border: 1px solid rgba(255, 255, 255, .25); color: #eef5f4; }
.secondary-action:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.hero-pills { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.hero-pills span {
  position: relative;
  padding-left: 13px;
  color: #9eacc3;
  font: 650 .74rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}
.hero-pills span::before {
  position: absolute;
  top: .48em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--coral);
  content: "";
}
.hero-visual { position: relative; z-index: 1; width: 100%; max-width: 430px; justify-self: end; }
.signal-panel {
  padding: 22px 22px 18px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 20px;
  background: rgba(255, 255, 255, .055);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06);
  backdrop-filter: blur(10px);
}
.signal-topline, .signal-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: #a5b5cc;
  font: 650 .64rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .08em;
}
.signal-topline span:first-child { color: var(--mint); }
.signal-wave {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 126px;
  padding: 16px 0;
}
.signal-wave span { flex: 1; height: 34%; border-radius: 99px; background: var(--mint); opacity: .82; }
.signal-wave span:nth-child(3n) { height: 72%; }
.signal-wave span:nth-child(4n) { height: 94%; background: #8ee9da; }
.signal-wave span:nth-child(5n) { height: 52%; }
.signal-wave span:nth-child(7n) { height: 78%; background: var(--coral); }
.signal-wave span:nth-child(8n) { height: 26%; }
.signal-footer { padding-top: 12px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: .58rem; }
.transform-line { display: flex; align-items: center; gap: 12px; padding: 10px 28px; color: var(--coral); }
.transform-line span { flex: 1; height: 1px; background: rgba(255, 255, 255, .14); }
.transform-line b { font-size: 1.2rem; font-weight: 500; }
.tag-stack {
  display: grid;
  margin: 0 22px;
  padding: 8px 18px;
  border-radius: 16px;
  background: #f7faf9;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .22);
}
.tag-stack div { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 10px 0; border-bottom: 1px solid #e3e9e7; }
.tag-stack div:last-child { border-bottom: 0; }
.tag-stack code { color: #52627a; font-size: .75rem; }
.tag-stack strong { color: var(--midnight); font: 800 .84rem ui-monospace, SFMono-Regular, Consolas, monospace; }

.section { margin-bottom: 72px; scroll-margin-top: 96px; }
.section-title {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 26px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.section-number {
  flex: 0 0 auto;
  padding-top: 5px;
  color: var(--teal);
  font: 750 .76rem ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .08em;
}
.section-title .eyebrow { margin-bottom: 5px; }
.section-title h2 { margin-bottom: 6px; color: var(--ink); font-size: clamp(1.65rem, 2.6vw, 2.35rem); letter-spacing: -.04em; line-height: 1.15; }
.section-title p:last-child { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: .92rem; }

.explorer { display: grid; grid-template-columns: minmax(230px, 280px) minmax(0, 1fr); gap: 20px; }
.sample-rail { display: grid; align-content: start; gap: 8px; }
.sample-group-label {
  grid-column: 1 / -1;
  margin: 14px 2px 3px;
  color: var(--muted);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.sample-group-label:first-child { margin-top: 0; }
.sample-button {
  display: grid;
  grid-template-columns: 28px 1fr;
  column-gap: 10px;
  align-items: center;
  width: 100%;
  padding: 13px 14px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: rgba(255, 255, 255, .58);
  color: var(--body);
  text-align: left;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.sample-button:hover { border-color: #b8c4c0; background: var(--surface); transform: translateX(2px); }
.sample-button[aria-pressed="true"] { border-color: var(--midnight); background: var(--midnight); color: #dbe5f2; }
.sample-index { grid-row: span 2; color: var(--teal); font: 750 .7rem ui-monospace, SFMono-Regular, Consolas, monospace; }
.sample-button[aria-pressed="true"] .sample-index { color: var(--mint); }
.sample-name { min-width: 0; color: var(--ink); font-size: .88rem; font-weight: 750; line-height: 1.35; }
.sample-button[aria-pressed="true"] .sample-name { color: #fff; }
.sample-dataset { color: var(--muted); font-size: .72rem; }
.sample-button[aria-pressed="true"] .sample-dataset { color: #9fb0c8; }
.player-panel, .tag-card, .comparison-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.player-panel { min-width: 0; padding: clamp(22px, 3vw, 32px); box-shadow: var(--shadow); }
.player-heading { display: flex; justify-content: space-between; gap: 18px; align-items: start; }
.player-heading h3 { margin: 0 0 7px; color: var(--ink); font-size: clamp(1.35rem, 2vw, 1.7rem); line-height: 1.2; letter-spacing: -.025em; }
.sample-focus { max-width: 690px; margin-bottom: 20px; color: var(--muted); font-size: .9rem; }
.track-badge { padding: 5px 9px; border-radius: 7px; background: #e2f5ef; color: #106e60; font: 800 .7rem ui-monospace, SFMono-Regular, Consolas, monospace; white-space: nowrap; }
audio { display: block; width: 100%; height: 44px; margin: 4px 0 12px; border-radius: 12px; background: #e9ecf1; }
.player-links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 26px; }
.player-links a { font-size: .78rem; font-weight: 700; text-decoration: none; }
.fact-source { margin: 0 0 10px; color: var(--muted); font-size: .64rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.fact-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.fact { min-width: 0; padding: 14px; border-radius: 12px; background: var(--paper); }
.fact-label { display: block; margin-bottom: 3px; color: var(--muted); font-size: .72rem; }
.fact-value { display: block; overflow-wrap: anywhere; color: var(--midnight); font-size: 1.08rem; line-height: 1.35; }
.transcript-panel { margin-top: 20px; padding: 18px 20px; border-left: 3px solid var(--teal); border-radius: 0 12px 12px 0; background: #eef6f2; }
.transcript-panel .eyebrow { color: #167766; }
.transcript-panel p:last-child { max-height: 126px; margin: 0; overflow: auto; color: #425447; font-size: .88rem; line-height: 1.75; }

.tag-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.tag-card { min-width: 0; padding: 22px; border-top: 3px solid var(--teal); }
.tag-card.blue { border-top-color: #5682c7; }
.tag-card.orange { border-top-color: var(--coral); }
.tag-card.violet { border-top-color: var(--violet); }
.tag-card h3 { margin: 0 0 13px; color: var(--ink); font-size: 1rem; }
.field-list { margin: 0; }
.field-row { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-top: 1px solid #edf0ed; }
.field-row dt { min-width: 0; color: var(--muted); font-size: .78rem; }
.field-row dd { max-width: 46%; margin: 0; overflow-wrap: anywhere; color: var(--midnight); font-size: .84rem; font-weight: 750; text-align: right; }
.field-path { display: block; margin-top: 3px; color: #8b93a1; font: .65rem ui-monospace, SFMono-Regular, Consolas, monospace; overflow-wrap: anywhere; }
.description-strip { margin-top: 16px; padding: 24px 26px; border-radius: 18px; background: var(--midnight); }
.description-heading { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; color: var(--mint); font-size: .75rem; font-weight: 800; letter-spacing: .03em; }
.description-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--coral); }
.description-strip p { max-width: 1040px; margin: 0; color: #d3ddeb; font-size: .93rem; line-height: 1.8; }
.data-details { margin-top: 16px; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: transparent; }
.data-details summary { padding: 13px 16px; color: var(--midnight); font-size: .82rem; font-weight: 750; cursor: pointer; }
.data-details pre { max-height: 480px; margin: 0; padding: 22px; overflow: auto; background: #101a31; color: #cedcf0; font: .74rem/1.6 ui-monospace, SFMono-Regular, Consolas, monospace; }

.query-panel { padding: clamp(22px, 3vw, 30px); border: 1px solid #d8deda; border-radius: 18px; background: #e9edea; }
.query-fields { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.query-fields label { display: grid; gap: 7px; min-width: 0; color: var(--muted); font-size: .72rem; font-weight: 750; }
.query-fields select { width: 100%; min-height: 43px; padding: 9px 32px 9px 12px; border: 1px solid #d4dcd7; border-radius: 9px; background: var(--surface); color: var(--midnight); font-size: .84rem; }
.query-result-header { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin: 26px 0 14px; }
.query-result-header strong { color: var(--midnight); font-size: .88rem; }
.text-button { padding: 4px 0; border: 0; background: transparent; color: var(--teal); font-size: .78rem; font-weight: 750; }
.query-results { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.query-result { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-width: 0; padding: 14px 16px; border: 1px solid transparent; border-radius: 11px; background: rgba(255, 255, 255, .82); text-align: left; transition: border-color 160ms ease, background-color 160ms ease; }
.query-result:hover { border-color: var(--teal); background: #fff; }
.result-name { color: var(--ink); font-size: .84rem; font-weight: 750; }
.result-meta { color: var(--muted); font-size: .7rem; text-align: right; }
.empty-message { margin: 0; padding: 16px; color: var(--muted); }

.comparison-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.comparison-card { min-width: 0; padding: 22px; }
.comparison-card.is-primary { border-top: 3px solid var(--teal); background: #f2f8f5; }
.comparison-card h3 { margin: 0 0 14px; color: var(--midnight); font-size: .94rem; }
.comparison-card.is-primary h3 { color: #0d7565; }
.comparison-caption { max-height: 230px; margin: 0; overflow: auto; color: #46536a; font-size: .85rem; line-height: 1.75; }
.comparison-meta { margin: 20px 0 0; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: .72rem; }
.load-notice { margin: 18px 0 0; color: #ffd0bf; font-size: .82rem; }

.site-footer { display: flex; justify-content: space-between; gap: 30px; padding: 30px clamp(20px, 4vw, 60px) 38px; border-top: 1px solid var(--line); color: var(--muted); font-size: .76rem; }
.site-footer p { max-width: 620px; margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; align-content: start; justify-content: flex-end; }
.footer-links a { font-weight: 650; text-decoration: none; }

@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { max-width: 760px; }
  .hero-visual { display: none; }
  .fact-grid, .query-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chapter-nav { gap: 0; }
  .chapter-nav a { padding-inline: 9px; }
}
@media (max-width: 760px) {
  .site-header { grid-template-columns: 1fr auto; gap: 12px; padding: 12px 18px 0; }
  .chapter-nav { grid-row: 2; grid-column: 1 / -1; justify-content: flex-start; overflow-x: auto; padding: 5px 0 8px; }
  .chapter-nav a { flex: 0 0 auto; padding: 6px 10px; }
  .header-actions { gap: 10px; }
  .readme-link { display: none; }
  main { padding: 16px 16px 40px; }
  .hero { margin-bottom: 54px; padding: 36px 26px; border-radius: 22px; }
  .hero h1 { font-size: clamp(2.4rem, 8vw, 3.6rem); }
  .section { margin-bottom: 54px; scroll-margin-top: 122px; }
  .explorer { grid-template-columns: 1fr; }
  .sample-rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sample-button { min-height: 76px; }
  .tag-grid, .comparison-grid { grid-template-columns: 1fr; }
  .comparison-caption { max-height: none; }
  .site-footer { display: block; padding: 26px 18px; }
  .footer-links { justify-content: flex-start; margin-top: 16px; }
}
@media (max-width: 520px) {
  .brand { gap: 7px; font-size: .98rem; }
  .brand img { width: 31px; height: 31px; }
  .language-switch button { min-width: 45px; }
  .hero { padding: 30px 22px; }
  .hero h1 { font-size: clamp(2.25rem, 11vw, 3rem); }
  .hero-lead { font-size: .92rem; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-pills { display: grid; gap: 8px; }
  .section-title { gap: 11px; padding-bottom: 16px; }
  .section-title h2 { font-size: 1.65rem; }
  .section-title p:last-child { font-size: .85rem; }
  .sample-rail, .fact-grid, .query-fields, .query-results { grid-template-columns: 1fr; }
  .sample-button { min-height: 0; }
  .player-panel, .query-panel { padding: 20px; }
  .player-heading { gap: 10px; }
  .player-heading h3 { font-size: 1.35rem; }
  .field-row { gap: 10px; }
  .field-row dd { max-width: 48%; }
  .description-strip { padding: 22px 20px; }
  .query-result { align-items: flex-start; flex-direction: column; gap: 4px; }
  .result-meta { text-align: left; }
  .footer-links { display: grid; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}