:root {
  color-scheme: light;
  --paper: #f0efeb;
  --paper-2: #e7e6e1;
  --ink: #1c1c1a;
  --muted: #8f8e88;
  --faint: #c6c5bf;
  --rule: rgba(28, 25, 21, 0.88);
  --rule-soft: rgba(28, 25, 21, 0.16);
  --teal: #1c1c1a;
  --teal-soft: #e7e6e1;
  --crimson: #4a4944;
  --crimson-soft: #e7e6e1;
  --amber: #4a4944;
  --amber-soft: #e7e6e1;
  --hero: #f5572f;
  --gap: #5c564e;
  --measure: 40rem;
  --page: 74rem;
  --serif: "Noto Serif SC", "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", "STSong", "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", "Noto Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --num: "Newsreader", "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --shadow: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #121410;
    --paper-2: #1b1e18;
    --ink: #ebe6dc;
    --muted: #b7b0a4;
    --faint: #8d867b;
    --rule: rgba(235, 230, 220, 0.82);
    --rule-soft: rgba(235, 230, 220, 0.16);
    --teal: #7dceB3;
    --teal-soft: #1a2c26;
    --crimson: #f0a8a2;
    --crimson-soft: #2c1c1a;
    --amber: #e4c48a;
    --amber-soft: #2a2418;
    --gap: #b7b0a4;
    --hero: #f5572f;
  }
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #121410;
  --paper-2: #1b1e18;
  --ink: #ebe6dc;
  --muted: #b7b0a4;
  --faint: #8d867b;
  --rule: rgba(235, 230, 220, 0.82);
  --rule-soft: rgba(235, 230, 220, 0.16);
  --teal: #7dceb3;
  --teal-soft: #1a2c26;
  --crimson: #f0a8a2;
  --crimson-soft: #2c1c1a;
  --amber: #e4c48a;
  --amber-soft: #2a2418;
  --gap: #b7b0a4;
  --hero: #f5572f;
}

html[data-theme="light"] {
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--teal-soft); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

a { color: inherit; }

img, svg { max-width: 100%; }

button, input { font: inherit; color: inherit; }

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.35rem 0.6rem;
  z-index: 20;
}
.skip:focus { top: 0.5rem; }

.page {
  width: min(var(--page), calc(100% - 2.4rem));
  margin: 0 auto 5rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  width: min(var(--page), calc(100% - 2.4rem));
  margin: 0 auto;
  padding: 0.7rem 0 0.45rem;
  background: var(--paper);
  border-bottom: 1px solid var(--rule-soft);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.topbar nav, .topbar .tools { display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem; align-items: baseline; }

.topbar button {
  background: none;
  border: 0;
  padding: 0;
  letter-spacing: 0.12em;
  cursor: pointer;
  color: var(--muted);
}
.topbar button[aria-pressed="true"], .topbar a[aria-current="page"] { color: var(--ink); }

.masthead { padding: 2.4rem 0 0.4rem; text-align: center; }

.brand-en {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
}

.double-rule {
  border: 0;
  border-top: 1px solid var(--ink);
  height: 0;
  border-bottom: 1px solid var(--ink);
  margin: 0.85rem auto 1.1rem;
  width: min(100%, 46rem);
  height: 5px;
  background: transparent;
}

.masthead h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 6.4vw, 4.5rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.subtitle {
  margin: 0.45rem 0 0;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 460;
  color: var(--muted);
  font-size: 1.15rem;
}

.thesis {
  max-width: 38rem;
  margin: 1.15rem auto 0;
  font-family: var(--serif);
  font-size: 1.22rem;
  line-height: 1.55;
}

.meta-line {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}
.meta-line time { font-family: var(--num); font-variant-numeric: tabular-nums; }

.ticks {
  display: flex;
  justify-content: center;
  align-items: end;
  gap: 3px;
  height: 36px;
  margin: 1.1rem auto 0.2rem;
}
.ticks i {
  display: block;
  width: 2px;
  height: 18px;
  background: var(--faint);
}
.ticks i.track-real { background: var(--hero); height: 28px; }
.ticks i.track-synthetic { background: var(--crimson); height: 22px; }
.ticks i.layer-report { opacity: 0.55; }
.tick-caption {
  margin: 0;
  text-align: center;
  color: var(--faint);
  font-size: 0.78rem;
}

.legend {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.45rem 0.75rem;
  align-items: baseline;
  margin: 1.4rem auto 0;
  max-width: 44rem;
  text-align: left;
  color: var(--muted);
  font-size: 0.9rem;
}

.readings {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 1.8rem 0 0.4rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.readings article {
  padding: 0.75rem 0.85rem 0.9rem;
  border-right: 1px solid var(--rule-soft);
  min-width: 0;
}
.readings article:nth-child(4n) { border-right: 0; }
.readings article:nth-child(n + 5) { border-top: 1px solid var(--rule-soft); }
.readings .lbl {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.readings strong {
  display: block;
  margin: 0.2rem 0 0.15rem;
  font-family: var(--num);
  font-weight: 560;
  font-size: clamp(1.35rem, 2vw, 1.85rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.readings .reading-gap strong { color: var(--gap); font-family: var(--serif); font-size: 1.25rem; }
.readings .unit { color: var(--faint); font-size: 0.78rem; }
.readings .note {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

.toc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 2.5rem;
  margin: 1.6rem 0 0.5rem;
  border-top: 1px solid var(--ink);
}
.toc a {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 0.4rem 0.8rem;
  padding: 0.85rem 0 0.9rem;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
}
.toc a:hover .toc-title { text-decoration: underline; text-underline-offset: 0.18em; }
.toc .vol-no {
  font-family: var(--num);
  font-style: italic;
  font-size: 1.05rem;
}
.toc-title { font-family: var(--serif); font-size: 1.2rem; line-height: 1.3; }
.toc-dek { grid-column: 2; margin: 0; color: var(--muted); font-size: 0.88rem; }

.volume { margin-top: 3.4rem; scroll-margin-top: 3.4rem; }
.chapter { margin-top: 2.2rem; scroll-margin-top: 3.4rem; }

.kicker {
  margin: 0 0 0.25rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
}
.volume h2, .chapter h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.volume h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); }
.chapter h3 { font-size: 1.45rem; }

.dek {
  max-width: var(--measure);
  margin: 0.55rem 0 0;
  color: var(--ink);
  font-size: 1.02rem;
}

.figure {
  margin: 1.1rem 0 0;
}
.figure-frame {
  background: var(--paper);
  border-top: 1px solid var(--ink);
  padding-top: 0.9rem;
}
.caption {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 48rem;
}
.caption b { color: var(--ink); font-weight: 600; }
.figlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 0.35rem 0 0;
  font-size: 0.86rem;
}
.figlinks a, .sources a, .prose a { color: var(--teal); }

.sources {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  margin: 0.45rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.82rem;
}

.chip {
  display: inline-block;
  padding: 0.02rem 0.38rem 0.08rem;
  border: 1px solid var(--teal);
  color: var(--teal);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
  white-space: nowrap;
  vertical-align: 0.05em;
  background: var(--teal-soft);
}
.chip-report { border-color: var(--amber); color: var(--amber); background: var(--amber-soft); }
.chip-infer { border-style: dashed; border-color: var(--amber); color: var(--amber); background: transparent; }
.chip-gap { border-style: dashed; border-color: var(--gap); color: var(--gap); background: transparent; }

.callout {
  margin: 0.9rem 0;
  padding: 0.15rem 0 0.15rem 0.85rem;
  border-left: 3px solid var(--ink);
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.5;
}
.callout.tone-real { border-left-color: var(--teal); }
.callout.tone-synthetic { border-left-color: var(--crimson); }
.callout.tone-note { border-left-color: var(--amber); }
.callout p { margin: 0.15rem 0 0.35rem; }

.fork { margin-top: 0.4rem; }
.fork-root {
  text-align: center;
  font-family: var(--serif);
  font-size: 1.25rem;
}
.fork-svg {
  display: block;
  width: min(100%, 28rem);
  height: 46px;
  margin: 0 auto;
  color: var(--ink);
}
.fork-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.fork-col { border-top: 2px solid var(--ink); padding-top: 0.7rem; }
.fork-col.real { border-top-color: var(--hero); }
.fork-col.synth { border-top-color: var(--crimson); }
.fork-col h4 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
}
.fork-col .who { margin: 0.15rem 0 0.45rem; color: var(--muted); font-size: 0.88rem; }
.fork-col ul { margin: 0; padding-left: 1.1rem; }
.fork-col li { margin: 0.25rem 0; }

.o-chart {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  align-items: end;
  min-height: 230px;
  padding: 1.4rem 0.25rem 0;
  border-bottom: 1px solid var(--ink);
}
.o-plot {
  height: 180px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.o-bar {
  width: min(4.2rem, 78%);
  background: var(--teal);
  position: relative;
  min-height: 2px;
}
.o-val {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.25rem);
  transform: translateX(-50%);
  font-family: var(--num);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  white-space: nowrap;
}
.plot-hollow .o-bar {
  background: transparent;
  box-shadow: inset 0 0 0 1.5px var(--crimson);
}
.plot-approx .o-bar {
  background: repeating-linear-gradient(
    -55deg,
    var(--teal),
    var(--teal) 5px,
    transparent 5px,
    transparent 8px
  );
  box-shadow: inset 0 0 0 1px var(--teal);
}
.o-date {
  display: block;
  margin-top: 0.35rem;
  text-align: center;
  font-family: var(--num);
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  color: var(--muted);
}
.o-notes { margin: 0.8rem 0 0; padding: 0; list-style: none; }
.o-notes li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.7rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 0.92rem;
}

.count-chart {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.3rem;
}
.count-row { display: grid; grid-template-columns: 7rem 1fr auto; gap: 0.7rem; align-items: center; }
.count-track { height: 0.7rem; background: var(--paper-2); }
.count-track span { display: block; height: 100%; }
.count-track.real span { background: var(--teal); }
.count-track.synthetic span { background: var(--crimson); }
.count-track.infra span { background: var(--ink); }
.count-n { font-family: var(--num); font-variant-numeric: tabular-nums; }

.table-wrap { overflow-x: auto; margin-top: 0.4rem; }
.scroll-hint { margin: 0.2rem 0 0; color: var(--faint); font-size: 0.78rem; }

table.data {
  width: 100%;
  border-collapse: collapse;
  min-width: 68rem;
  font-size: 0.92rem;
  line-height: 1.45;
}
table.data.narrow { min-width: 36rem; }
table.data th {
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  border-bottom: 1px solid var(--ink);
  padding: 0.4rem 0.65rem 0.45rem 0;
  vertical-align: bottom;
}
table.data td {
  border-bottom: 1px solid var(--rule-soft);
  padding: 0.7rem 0.75rem 0.75rem 0;
  vertical-align: top;
}
table.data td.dim, table.data th.dim { font-family: var(--serif); color: var(--ink); }
table.data tr.track-real td.org { box-shadow: inset 2px 0 0 var(--hero); padding-left: 0.55rem; }
table.data tr.track-synthetic td.org { box-shadow: inset 2px 0 0 var(--crimson); padding-left: 0.55rem; }
table.data tr.track-infra td.org { box-shadow: inset 2px 0 0 var(--ink); padding-left: 0.55rem; }
table.data details { margin-top: 0.25rem; }
table.data summary { cursor: pointer; color: var(--teal); }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
  margin: 0.9rem 0 0.3rem;
}
.filters button, .filters label.toggle {
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  padding: 0.1rem 0;
  color: var(--muted);
  cursor: pointer;
}
.filters button[aria-pressed="true"], .filters label.toggle:has(input:checked) {
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
  font-weight: 600;
}
.table-wrap a, .glance a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 0.16em;
}
.filters input[type="search"] {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  padding: 0.15rem 0;
  min-width: 12rem;
}
.filters input[type="checkbox"] { accent-color: var(--teal); }
.filters button.clear-filters {
  border: 1px solid var(--ink);
  padding: 0.05rem 0.5rem;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.facet-n {
  font-family: var(--num);
  font-variant-numeric: tabular-nums;
  color: var(--faint);
}
.filters button[aria-pressed="true"] .facet-n { color: var(--ink); }

.definition {
  margin: 0.75rem 0 0.55rem;
  padding: 0.45rem 0 0.55rem 0.75rem;
  border-left: 3px solid var(--ink);
  background: var(--paper-2);
}
.definition-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  align-items: baseline;
}
.definition p { margin: 0.3rem 0 0; }
.definition details { margin-top: 0.25rem; }
.definition summary { cursor: pointer; color: var(--teal); }

.cite-strip {
  grid-column: 1 / -1;
  margin-top: 0.8rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--rule-soft);
  color: var(--muted);
  font-size: 0.9rem;
}
.cite-strip p { margin: 0.25rem 0; }
.cite-strip time { font-family: var(--num); font-variant-numeric: tabular-nums; }

.glance {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 0.4rem 1.6rem;
  margin-top: 1.5rem;
  padding-top: 0.2rem;
}
.glance h2, .glance h3 {
  margin: 0.2rem 0;
  font-family: var(--serif);
  font-weight: 600;
}
.glance h2 { font-size: 1.7rem; }
.glance h3 { font-size: 1.15rem; margin-top: 0.8rem; }
.glance-fork { margin-top: 0.4rem; }
.glance-counts, .glance-events { list-style: none; margin: 0.3rem 0 0; padding: 0; }
.glance-counts li, .glance-events li {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.glance-events { display: block; }
.glance-events li { display: grid; grid-template-columns: 6.4rem 1fr; }
.glance-events time { font-family: var(--num); font-variant-numeric: tabular-nums; }

.product-mast { text-align: left; padding-top: 0.6rem; }
.product-mast .double-rule { margin-left: 0; }
.product-mast h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
.track-banner {
  margin: 0.8rem 0;
  padding: 0.45rem 0.7rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule-soft);
}
.track-banner.track-real { border-top-color: var(--hero); }
.track-banner.track-synthetic { border-top-color: var(--crimson); }
.product-fields { margin: 0.4rem 0 0; }
.product-fields > div {
  padding: 0.85rem 0;
  border-top: 1px solid var(--rule-soft);
}
.product-fields dt {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.product-fields dd { margin: 0.25rem 0 0; }
.filter-count { margin: 0.2rem 0 0.4rem; color: var(--muted); font-size: 0.86rem; font-variant-numeric: tabular-nums; }

.lanes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 0.6rem;
}
.lane { border-top: 2px solid var(--ink); padding-top: 0.6rem; }
.lane.real { border-top-color: var(--teal); }
.lane.synthetic { border-top-color: var(--crimson); }
.lane h4 { margin: 0 0 0.4rem; font-family: var(--serif); font-size: 1.25rem; }
.step { padding: 0.75rem 0; border-top: 1px solid var(--rule-soft); }
.step .step-no {
  font-family: var(--num);
  font-style: italic;
  color: var(--faint);
  margin-right: 0.4rem;
}
.step h5 { display: inline; margin: 0; font-size: 1rem; font-family: var(--serif); font-weight: 600; }
.step p { margin: 0.3rem 0 0; }

.timeline { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.event {
  display: grid;
  grid-template-columns: 8.2rem 1fr;
  gap: 0.8rem;
  padding: 0.95rem 0;
  border-top: 1px solid var(--rule-soft);
}
.event:last-child { border-bottom: 1px solid var(--rule-soft); }
.event time {
  font-family: var(--num);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
}
.event h4 { margin: 0; font-family: var(--serif); font-size: 1.12rem; font-weight: 600; }
.event p { margin: 0.3rem 0 0; }
.approx-mark { color: var(--amber); font-size: 0.78rem; margin-left: 0.25rem; }

.gap-list { margin: 0.4rem 0 0; padding: 0; list-style: none; counter-reset: gap; }
.gap-list li {
  counter-increment: gap;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.4rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.gap-list li::before {
  content: counter(gap, decimal-leading-zero);
  font-family: var(--num);
  color: var(--faint);
}

.api-list { columns: 2; padding-left: 1.1rem; }
.api-list li { break-inside: avoid; margin: 0.25rem 0; }
.api-list code { font-size: 0.86em; }

.state {
  margin: 2rem 0;
  padding: 1rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.state button {
  margin-top: 0.6rem;
  background: transparent;
  border: 1px solid var(--ink);
  padding: 0.25rem 0.7rem;
  cursor: pointer;
}

.footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
  color: var(--muted);
  font-size: 0.92rem;
}
.footer .colophon {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.4rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.panel-page { padding-top: 1.4rem; }
.panel-page .masthead { padding-top: 0.4rem; text-align: left; }
.panel-page .masthead h1 { font-size: clamp(2rem, 4vw, 3rem); }
.panel-page .double-rule { margin-left: 0; }

@media (max-width: 860px) {
  .readings { grid-template-columns: 1fr 1fr; }
  .readings article:nth-child(4n) { border-right: 1px solid var(--rule-soft); }
  .readings article:nth-child(2n) { border-right: 0; }
  .readings article:nth-child(n + 3) { border-top: 1px solid var(--rule-soft); }
  .toc, .lanes, .fork-cols, .api-list, .glance { grid-template-columns: 1fr; columns: 1; }
  .event { grid-template-columns: 1fr; gap: 0.15rem; }
  .o-notes li { grid-template-columns: 1fr; gap: 0.15rem; }
  .count-row { grid-template-columns: 5.5rem 1fr auto; }
}

@media (max-width: 560px) {
  .page, .topbar { width: min(100% - 1.2rem, var(--page)); }
  .topbar { letter-spacing: 0.06em; }
  .readings { grid-template-columns: 1fr; }
  .readings article { border-right: 0 !important; border-top: 1px solid var(--rule-soft); }
  .readings article:first-child { border-top: 0; }
  .o-chart { gap: 0.3rem; }
  .o-val { font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  .topbar, .filters, .noprint { display: none !important; }
  body { background: white; color: black; }
  .page { width: auto; }
  a { text-decoration: none; }
}