/* ── Tokens ──────────────────────────────────────────────────────────────
   One accent: the paper's "human correction" orange. Everything else is
   ink and warm neutrals so the accent always means "the sentence". */
:root {
  --paper: #ffffff;
  --plane: #f7f6f2;
  --card: #ffffff;
  --ink: #0b0b0b;
  --text: #22211e;
  --text-2: #52514e;
  --muted: #6f6d68;
  --rule: #e6e5df;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --wash: #ecebe5;

  --accent: #eb6834;
  --accent-ink: #b8481c;
  --accent-soft: #fdf0e9;
  --accent-edge: #f3c7b2;
  --accent-mid: #f6b394;
  --neutral: #d4d3cb;
  --base: #898781;
  --good: #0ca30c;
  --good-ink: #0a7a0a;
  --bad: #d03b3b;
  --bad-ink: #b42f2f;
  --dark: #0f1419;

  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 1120px;
  --prose: 720px;
  --radius: 14px;
}

/* ── Base ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video { max-width: 100%; display: block; }
p, li, dt { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
a { color: var(--accent-ink); }
sub, sup { font-size: .72em; line-height: 0; }
code { font-family: var(--mono); font-size: .86em; }
q { quotes: "\201C" "\201D"; }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: #fff; padding: 8px 12px; border-radius: 8px; }

/* ── Hero ──────────────────────────────────────────────────────────────── */
.hero {
  background: radial-gradient(120% 120% at 15% 0%, #26303b 0%, #141a21 55%, #0d1117 100%);
  color: #fff;
  padding: 104px 24px 40px;
}
.hero__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 48px 64px;
}
.hero__text { flex: 1 1 400px; min-width: 0; }
.hero__eyebrow {
  margin: 0 0 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #ffa37d;
}
.hero__title {
  margin: 0 0 18px;
  font: 500 clamp(42px, 6.2vw, 76px)/1.02 var(--serif);
  letter-spacing: -.02em;
}
.hero__subtitle { margin: 0 0 26px; max-width: 34ch; font-size: clamp(17px, 1.8vw, 21px); line-height: 1.45; color: #c9d1d9; }
.hero__authors { margin: 0 0 2px; font-size: 16px; font-weight: 500; color: #e6edf3; }
.hero__affil { margin: 0 0 28px; font-size: 14px; color: #9aa6b2; }
.hero__buttons { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .2);
  background: rgba(255, 255, 255, .08);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}
.btn svg { width: 18px; height: 18px; fill: currentColor; }
.btn.is-disabled { opacity: .55; }

.hero__demo { display: flex; gap: 16px; }
.clip {
  position: relative;
  margin: 0;
  width: 210px;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5);
}
.clip video { width: 100%; aspect-ratio: 406 / 720; object-fit: cover; }
.clip::after { content: ""; position: absolute; inset: 0; border: 2px solid; border-radius: 14px; pointer-events: none; }
.clip.is-fail::after { border-color: #e5534b; }
.clip.is-pass::after { border-color: #3fb950; }
.clip figcaption {
  position: absolute;
  inset: auto 0 0;
  display: flex;
  flex-direction: column;
  padding: 32px 12px 10px;
  background: linear-gradient(transparent, rgba(0, 0, 0, .85));
  font-size: 13px;
}
.clip figcaption span { font-weight: 600; }
.clip figcaption b { font-size: 12px; }
.clip.is-fail b { color: #ff8b85; }
.clip.is-pass b { color: #6be08a; }
.hero__note { max-width: var(--wrap); margin: 48px auto 0; text-align: center; font-size: 15px; color: #8b98a5; }

/* ── Top nav ───────────────────────────────────────────────────────────── */
.topnav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--rule);
  transform: translateY(-100%);
  transition: transform .25s ease;
}
.topnav.is-visible { transform: none; }
.topnav__inner { max-width: var(--wrap); height: 56px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; gap: 24px; }
.topnav__brand { font: 500 19px var(--serif); color: var(--ink); text-decoration: none; white-space: nowrap; }
.topnav__links { display: flex; gap: 2px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.topnav__links::-webkit-scrollbar { display: none; }
.topnav__links a {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  white-space: nowrap;
}
.topnav__links a:hover { color: var(--ink); background: var(--plane); }
.topnav__links a.is-active { color: var(--ink); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent-edge); }

/* ── Layout & type ─────────────────────────────────────────────────────── */
.band { padding: 104px 24px; }
.band--plane { background: var(--plane); }
.wrap { max-width: var(--wrap); margin: 0 auto; }
.prose { max-width: var(--prose); }
.prose p { margin: 0 0 1.1em; }
.kicker { margin: 0 0 12px; font-size: 13px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-ink); }
.statement {
  max-width: 24ch;
  text-wrap: balance;
  margin: 0 0 36px;
  font: 500 clamp(31px, 4vw, 46px)/1.12 var(--serif);
  letter-spacing: -.015em;
  color: var(--ink);
}
.subhead { margin: 72px 0 16px; font-size: 22px; font-weight: 600; letter-spacing: -.01em; color: var(--ink); }
.h-plain { margin: 40px 0 12px; font-size: 21px; font-weight: 600; color: var(--ink); }
.more { font-size: 14px; font-weight: 600; text-decoration: none; }
.more::after { content: " \2192"; }
.sentence { font: italic 400 22px/1.35 var(--serif); color: var(--ink); }
.tuple {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font: 400 14px var(--mono);
}
.tuple span { color: #ffb08c; }

/* ── Cards shared by charts, notes, modes ───────────────────────────── */
.chart-card, .note-card, .mode, .gallery, .pipeline li {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
.chart-card { margin: 32px 0; padding: 24px 24px 16px; }
.chart-card__head { display: flex; flex-direction: column; gap: 2px; margin-bottom: 16px; }
.chart-card__head strong { font-size: 16px; font-weight: 600; color: var(--ink); }
.chart-card__head span { font-size: 14px; color: var(--text-2); }
.chart-card__foot { max-width: 80ch; margin: 16px 0 4px; font-size: 13.5px; color: var(--text-2); }
.legend { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 18px; font-size: 13px; color: var(--text-2); }
.legend > span { display: inline-block; }
.legend .sw, .legend .dot { margin-right: 8px; vertical-align: -1px; }
.sw { display: inline-block; width: 14px; height: 10px; border-radius: 3px; }
.sw--accent { background: var(--accent); }
.sw--neutral { background: var(--neutral); }
.sw--wash { background: var(--wash); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.dot--base { background: var(--base); }
.dot--accent { background: var(--accent); }
.dot--ring { box-shadow: inset 0 0 0 1.5px var(--axis); }

.table-view { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--rule); overflow-x: auto; }
.table-view summary { cursor: pointer; font-size: 13px; font-weight: 600; color: var(--text-2); list-style: none; }
.table-view summary::-webkit-details-marker { display: none; }
.table-view summary::before { content: "\25B8  "; }
.table-view[open] summary::before { content: "\25BE  "; }
.table-view table { width: 100%; margin-top: 12px; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
.table-view th, .table-view td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--rule); }
.table-view th { font-size: 13px; font-weight: 600; color: var(--ink); }


/* ── Taxonomy ──────────────────────────────────────────────────────────── */
.taxbars { display: grid; gap: 14px; }
.taxbar { display: grid; grid-template-columns: 110px minmax(0, 1fr); align-items: center; gap: 16px; }
.taxbar__name { font-size: 14px; font-weight: 600; color: var(--ink); }
.taxbar__track { display: flex; gap: 2px; height: 40px; }
.taxbar__seg { display: flex; align-items: center; min-width: 0; background: var(--neutral); cursor: default; }
.taxbar__seg:first-child { border-radius: 4px 0 0 4px; }
.taxbar__seg:last-child { border-radius: 0 4px 4px 0; }
.taxbar__seg.is-accent { background: var(--accent); }
.taxbar__seg:hover, .taxbar__seg:focus-visible { filter: brightness(1.07); }
.seg-label { width: 100%; padding: 0 10px; font-size: 13px; font-weight: 500; color: var(--ink); white-space: nowrap; }

.modes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 24px 0; }
.mode { display: flex; flex-direction: column; padding: 20px; }
.mode header { display: flex; flex-direction: column; gap: 2px; margin-bottom: 10px; }
.mode h3 { margin: 0; font-size: 16px; font-weight: 600; color: var(--ink); }
.mode .share { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.mode p { margin: 0 0 12px; font-size: 14.5px; line-height: 1.55; color: var(--text-2); }
.mode .ask { margin: auto 0 0; padding-top: 12px; border-top: 1px solid var(--rule); font-size: 13px; }
.ask b { color: var(--ink); }
.mode.is-reachable { background: var(--accent-soft); border-color: var(--accent-edge); }
.mode.is-reachable .ask { border-color: var(--accent-edge); }
.badge { display: table; margin-top: 8px; padding: 2px 8px; border-radius: 999px; background: var(--accent); color: var(--ink); font-size: 11.5px; font-weight: 600; vertical-align: 1px; }

.callout { max-width: var(--prose); margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; background: var(--accent-soft); }
.callout p { margin: 0; font-size: 15.5px; }
.callout--warn { border-color: #c98500; background: #fdf6e3; }

/* ── Paper figures ─────────────────────────────────────────────────────── */
.paper-fig { margin: 40px 0 0; }
.zoom { display: block; width: 100%; padding: 0; overflow: hidden; border: 1px solid var(--rule); border-radius: 12px; background: #fff; cursor: zoom-in; }
.zoom img { width: 100%; height: auto; }
.paper-fig figcaption { max-width: 90ch; margin-top: 10px; font-size: 13.5px; color: var(--text-2); }
.paper-fig.is-tall { max-width: 900px; }
.overview-fig { margin: 0; }
.overview-fig .zoom { box-shadow: 0 12px 32px rgba(15, 20, 25, .08); }
.timeline-fig { max-width: 820px; }

/* ── Method ────────────────────────────────────────────────────────────── */
.pipeline { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 40px 0 20px; padding: 0; list-style: none; }
.pipeline li { position: relative; padding: 20px; }
.pipeline li:not(:last-child)::after {
  content: "\2192";
  position: absolute;
  top: 50%;
  right: -14px;
  z-index: 1;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 14px;
}
.step { display: inline-grid; place-items: center; width: 28px; height: 28px; margin-bottom: 12px; border-radius: 50%; background: var(--ink); color: #fff; font-size: 13px; font-weight: 600; }
.pipeline h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; color: var(--ink); }
.pipeline p { margin: 0; font-size: 14.5px; line-height: 1.55; color: var(--text-2); }
.grounding { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; padding: 4px 2px; }
.grounding .arrow { color: var(--muted); }

.ranges { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 32px; margin: 24px 0 8px; }
.ranges__track { position: relative; height: 34px; border-radius: 4px; background: var(--wash); }
.ranges__track span { position: absolute; top: 0; bottom: 0; display: grid; place-items: center; font-size: 13px; font-weight: 500; color: var(--ink); }
.ranges__track .r1 { background: #f4a07a; border-radius: 4px 0 0 4px; }
.ranges__track .r2 { background: #ee7e4c; border-left: 2px solid var(--card); }
.ranges__track .r3 { background: #d9582a; border-left: 2px solid var(--card); border-radius: 0 4px 4px 0; }
.ranges__axis { position: relative; height: 20px; margin-top: 6px; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.ranges__axis span { position: absolute; transform: translateX(-50%); }
.ranges__axis span:first-child { transform: none; }
.ranges__axis span:last-child { transform: translateX(-100%); }
.ranges__unit { margin: 4px 0 0; font-size: 12.5px; color: var(--text-2); }

.seg { display: inline-flex; flex-wrap: wrap; gap: 4px; max-width: 100%; margin-bottom: 20px; padding: 4px; border: 1px solid var(--rule); border-radius: 999px; background: var(--plane); }
.seg button { padding: 7px 14px; border: 0; border-radius: 999px; background: transparent; color: var(--text-2); font-size: 14px; font-weight: 500; cursor: pointer; }
.seg button:hover { color: var(--ink); }
.seg button[aria-selected="true"] { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.seg .count { margin-left: 6px; font-size: 12px; color: var(--muted); }

.explainer__body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); align-items: center; gap: 36px; }
.explainer__task { margin: 0 0 8px; font-size: 14px; color: var(--text-2); }
.explainer__task b { font-weight: 600; color: var(--ink); }
.explainer .sentence { display: block; margin-bottom: 12px; }
.tuples { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.explainer__stat { margin: 0 0 6px; font-size: 15px; }
.explainer__stat b { font-size: 20px; color: var(--ink); }
.explainer__note { margin: 0 0 12px; font-size: 14px; color: var(--text-2); }

.timeline__track { position: relative; height: 96px; border-radius: 6px; background: var(--wash); cursor: crosshair; touch-action: pan-y; }
.timeline__env { position: absolute; bottom: 0; height: 100%; overflow: visible; background: rgba(235, 104, 52, .1); }
.env-fill { fill: var(--accent); fill-opacity: .22; }
.env-line { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
.timeline__cursor { position: absolute; top: -4px; bottom: -4px; width: 1px; background: var(--ink); pointer-events: none; }
.timeline__axis { position: relative; height: 20px; margin-top: 6px; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.timeline__axis span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.timeline__own { position: absolute; top: 50%; transform: translate(-50%, -50%); font-size: 13px; color: var(--text-2); white-space: nowrap; pointer-events: none; }
.timeline__axis span:first-child { transform: none; }
.timeline__axis span:last-child { transform: translateX(-100%); }
.timeline__key { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 12px; font-size: 12.5px; color: var(--text-2); }
.timeline__key span { display: inline-flex; align-items: center; gap: 8px; }

.eq { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 56px; margin: 8px 0 32px; font: 400 22px var(--serif); color: var(--ink); }
.twocol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 24px 0 8px; }
.note-card { padding: 24px; }
.note-card h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; color: var(--ink); }
.note-card p { margin: 0; font-size: 15px; color: var(--text-2); }
.assume { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; font-size: 15px; color: var(--text-2); }
.assume b { margin-right: 6px; color: var(--ink); }
.assume a { font-size: 13px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.assume a::after { content: " \2192"; }

/* ── Results charts ────────────────────────────────────────────────────── */
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid2 .chart-card { margin: 16px 0 0; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); align-items: center; gap: 32px; }
.split .paper-fig { margin: 0; }

.dumb { display: grid; gap: 22px; padding: 6px 52px 0 0; }
.dumb__row { display: grid; gap: 8px; }
.dumb__name { font-size: 14px; font-weight: 600; color: var(--ink); }
.dumb__track { position: relative; height: 28px; background: linear-gradient(var(--grid), var(--grid)) center / 100% 1px no-repeat; }
.dumb__line { position: absolute; top: 50%; height: 2px; background: var(--axis); transform: translateY(-50%); }
.dumb__dot { position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%; box-shadow: 0 0 0 2px var(--card); transform: translate(-50%, -50%); cursor: default; }
.dumb__dot::before { content: ""; position: absolute; inset: -6px; }
.dumb__val { position: absolute; top: 50%; transform: translateY(-50%); font-size: 13px; font-weight: 600; color: var(--ink); white-space: nowrap; font-variant-numeric: tabular-nums; }
.dumb__val.is-base { font-weight: 500; color: var(--text-2); }
.dumb__axis { position: relative; height: 22px; margin-top: 2px; padding-top: 6px; border-top: 1px solid var(--axis); font-size: 12px; color: var(--muted); }
.dumb__axis span { position: absolute; transform: translateX(-50%); }
.dumb__axis span:first-child { transform: none; }
.dumb__axis span:last-child { transform: translateX(-100%); }

.funnel { display: grid; gap: 22px; }
.funnel__name { margin: 0 0 8px; font-size: 14px; font-weight: 600; color: var(--ink); }
.funnel__stage { margin-bottom: 10px; }
.funnel__label { margin: 0 0 4px; font-size: 13px; line-height: 1.4; color: var(--text-2); }
.funnel__label b { font-size: 15px; color: var(--ink); font-variant-numeric: tabular-nums; }
.funnel__bar { display: block; min-width: 4px; height: 14px; border-radius: 0 4px 4px 0; background: var(--neutral); }
.funnel__bar.is-soft { background: var(--accent-mid); }
.funnel__bar.is-accent { background: var(--accent); }

.dots { display: inline-grid; grid-template-columns: repeat(10, 10px); gap: 4px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--axis); }
.dots i.is-accent { background: var(--accent); box-shadow: none; }
.dots i.is-base { background: var(--base); box-shadow: none; }

.pertask { display: grid; }
.pertask__row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px 24px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.pertask__row:last-child { border-bottom: 0; }
.pertask__task { font: italic 400 17px var(--serif); color: var(--ink); }
.pertask__val { display: inline-flex; align-items: center; gap: 12px; }
.pertask__val b { min-width: 3.2em; font-size: 14px; text-align: right; font-variant-numeric: tabular-nums; }
.pertask__note { max-width: 36ch; font-size: 13.5px; text-align: right; color: var(--text-2); }

.robot__row { display: grid; grid-template-columns: minmax(150px, 1fr) 266px 266px; align-items: center; gap: 12px 32px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.robot__row--head { padding: 0 0 8px; font-size: 13px; font-weight: 600; color: var(--text-2); }
.robot__col { text-align: center; }
.robot__col.is-accent { color: var(--accent-ink); }
.robot__name { margin: 0; font-size: 14.5px; font-weight: 600; color: var(--ink); }
.robot__group { display: flex; gap: 10px; }
.run { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px; border-radius: 8px; cursor: default; }
.run:hover, .run:focus-visible { background: var(--plane); }
.run .dots { grid-template-columns: repeat(5, 10px); }
.run__n { font-size: 12.5px; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.robot__row--time { border-bottom: 0; font-size: 13.5px; color: var(--text-2); }
.robot__row--time .robot__name { font-weight: 500; color: var(--text-2); }
.robot__row--time .robot__group span { width: 82px; text-align: center; }

/* ── Gallery ───────────────────────────────────────────────────────────── */
.gallery { --aspect: 1 / 1; padding: 24px; }
.gallery__body { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 28px; }
.gallery__tasks { position: relative; display: flex; flex-direction: column; gap: 2px; max-height: 600px; overflow: auto; }
.gallery__group { margin: 14px 0 4px 12px; font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.gallery__group:first-child { margin-top: 0; }
.gallery__tasks button {
  position: relative;
  display: grid;
  gap: 2px;
  padding: 10px 26px 10px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}
.gallery__tasks button span { font-size: 14px; font-weight: 500; line-height: 1.35; }
.gallery__tasks button small { font-size: 12px; color: var(--muted); }
.gallery__tasks button:hover { background: var(--plane); }
.gallery__tasks button[aria-current="true"] { background: var(--plane); border-color: var(--rule); box-shadow: inset 3px 0 0 var(--accent); }
.has-corr { position: absolute; top: 14px; right: 12px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.gallery__title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin: 0 0 14px; }
.gallery__title b { font-size: 17px; font-weight: 600; color: var(--ink); }
.gallery__title span { font-size: 13px; color: var(--muted); }
.gallery__pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; max-width: 660px; }
.player { margin: 0; }
.player__frame { position: relative; aspect-ratio: var(--aspect); overflow: hidden; border-radius: 12px; background: #111; }
.player__frame video { width: 100%; height: 100%; object-fit: cover; }
.player__frame::after { content: ""; position: absolute; inset: 0; border: 2px solid; border-radius: 12px; pointer-events: none; }
.player.is-fail .player__frame::after { border-color: var(--bad); }
.player.is-pass .player__frame::after { border-color: var(--good); }
.player figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 8px; margin-top: 8px; font-size: 13px; }
.player figcaption b { white-space: nowrap; }
.player__who { color: var(--text-2); }
.player.is-fail figcaption b { color: var(--bad-ink); }
.player.is-pass figcaption b { color: var(--good-ink); }
.player__bar { position: relative; height: 4px; margin-top: 8px; border-radius: 2px; background: var(--grid); }
.player__bar i { position: absolute; inset: 0 auto 0 0; border-radius: 2px; background: var(--ink); opacity: .5; }
.player__window { position: absolute; top: -3px; bottom: -3px; min-width: 3px; border-radius: 2px; background: var(--accent); }
.player__live { position: absolute; top: 10px; left: 10px; padding: 4px 10px; border-radius: 999px; background: var(--accent); color: var(--ink); font-size: 12px; font-weight: 600; }
.gallery__controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 18px; }
.ctl { display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--rule); border-radius: 50%; background: #fff; cursor: pointer; }
.ctl:hover { background: var(--plane); }
.ctl svg { width: 18px; height: 18px; fill: var(--ink); }
.ctl .i-play, .ctl.is-paused .i-pause { display: none; }
.ctl.is-paused .i-play { display: block; }
.gallery__correction { margin: 0 0 0 8px; font-size: 14px; color: var(--text-2); }
.gallery__correction::before { content: ""; display: inline-block; width: 10px; height: 10px; margin-right: 8px; border-radius: 2px; background: var(--accent); }
.gallery__correction q { font: italic 400 17px var(--serif); color: var(--ink); }

/* ── Discussion ────────────────────────────────────────────────────────── */
.limits { margin: 0 0 8px; padding-left: 1.2em; color: var(--text-2); }
.limits li { margin: 4px 0; }

/* ── Footer, lightbox, tooltip ─────────────────────────────────────────── */
.footer { padding: 40px 24px; background: var(--dark); color: #9aa6b2; font-size: 14px; }
.footer p { margin: 4px 0; }
.footer a { color: #ffb08c; }

.lightbox { max-width: 96vw; max-height: 94vh; padding: 0; overflow: visible; border: 0; background: transparent; }
.lightbox::backdrop { background: rgba(10, 12, 16, .84); }
.lightbox img { width: auto; height: auto; max-width: 96vw; max-height: 90vh; border-radius: 8px; background: #fff; cursor: zoom-out; }
.lightbox__close { position: fixed; top: 16px; right: 20px; width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(255, 255, 255, .15); color: #fff; font-size: 28px; line-height: 1; cursor: pointer; }

.tip {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  max-width: 280px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  line-height: 1.35;
  pointer-events: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .2);
}
.tip b { font-size: 15px; }
.tip span { color: #c3c2b7; }

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 1040px) {
  .modes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pipeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pipeline li::after { display: none; }
}
@media (max-width: 900px) {
  .explainer__body, .grid2, .split, .gallery__body, .ranges { grid-template-columns: minmax(0, 1fr); }
  .gallery__tasks { flex-direction: row; max-height: none; overflow-x: auto; padding-bottom: 6px; }
  .gallery__tasks button { flex: 0 0 220px; }
  .gallery__group { display: none; }
  .robot__row { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .robot__row--head { display: none; }
  .robot__group::before { content: attr(data-label); width: 128px; flex: none; align-self: center; font-size: 12.5px; color: var(--text-2); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .band { padding: 72px 16px; }
  .hero { padding: 76px 16px 32px; }
  .hero__text { text-align: center; }
  .hero__subtitle { margin-inline: auto; }
  .hero__buttons { justify-content: center; }
  .clip { width: min(44vw, 200px); }
  .topnav__inner { padding: 0 12px; }
  .topnav__brand { display: none; }
  .topnav__links { margin-left: 0; }
  .modes, .pipeline, .twocol { grid-template-columns: minmax(0, 1fr); }
  .chart-card { padding: 18px 16px 12px; }
  .gallery { padding: 16px; }
  .gallery__groups { display: grid; width: 100%; border-radius: 12px; }
  .gallery__groups button { border-radius: 9px; text-align: left; }
  .taxbar { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .pertask__row { grid-template-columns: minmax(0, 1fr); }
  .pertask__note { text-align: left; }
  .robot__group::before { width: 100%; }
  .robot__group { flex-wrap: wrap; gap: 4px; }
  .sentence { font-size: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .topnav { transition: none; }
}