/* Upbringing: tokens follow the validated reference palette (light + dark), one accent per act. */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f3f2ee;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --a1: #2a78d6;
  --a2: #eb6834;
  --a3: #1baf7a;
  --s1: #2a78d6;
  --s2: #eb6834;
  --s3: #1baf7a;
  --s4: #eda100;
  --gray-mark: #c3c2b7;
  --good: #0ca30c;
  --critical: #d03b3b;
  --good-text: #006300;
  --shade: 42, 120, 214;   /* token heat: blue, as rgb for alpha washes */
  --shade-neg: 227, 73, 72;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 10px;
  --col: 720px;
  --wide: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --surface-2: #222221; --ink: #ffffff; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --border: rgba(255, 255, 255, 0.10);
    --a1: #3987e5; --a2: #d95926; --a3: #199e70; --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
    --gray-mark: #4a4a47; --good-text: #0ca30c; --shade: 57, 135, 229; --shade-neg: 230, 103, 103;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --surface-2: #222221; --ink: #ffffff; --ink-2: #c3c2b7; --muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255, 255, 255, 0.10);
  --a1: #3987e5; --a2: #d95926; --a3: #199e70; --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
  --gray-mark: #4a4a47; --good-text: #0ca30c; --shade: 57, 135, 229; --shade-neg: 230, 103, 103;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--page); color: var(--ink); font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration-color: var(--axis); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
.mono, .trace-text, .tok-shown { font-family: var(--mono); font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
.muted { color: var(--muted); }
strong { font-weight: 600; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--a1); outline-offset: 2px; border-radius: 4px; }

/* ---------------------------------------------------------------- top bar */
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px;
  padding: 10px max(16px, calc((100vw - var(--wide)) / 2)); background: color-mix(in srgb, var(--page) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { font: 600 19px/1 var(--serif); text-decoration: none; letter-spacing: 0.01em; }
.chapters { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.chapters a {
  display: flex; align-items: baseline; gap: 6px; padding: 6px 10px; border-radius: 999px; text-decoration: none;
  color: var(--ink-2); font-size: 14px; white-space: nowrap; transition: background .2s, color .2s;
}
.chapters a .num { font: 600 13px var(--serif); color: var(--muted); }
.chapters a:hover { background: var(--surface-2); color: var(--ink); }
.chapters a.active { color: var(--ink); background: var(--surface-2); }
.chapters a.active[data-act="1"] .num { color: var(--a1); }
.chapters a.active[data-act="2"] .num { color: var(--a2); }
.chapters a.active[data-act="3"] .num { color: var(--a3); }
.theme-toggle {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px; width: 34px; height: 34px;
  display: grid; place-items: center; cursor: pointer; color: var(--ink-2); flex: none;
}

/* ---------------------------------------------------------------- layout */
main { padding: 0 16px; }
.hero, .act { max-width: var(--wide); margin: 0 auto; }
.hero { padding: 72px 0 40px; }
.act { padding: 72px 0 24px; border-top: 1px solid var(--border); }
.act-head, .body-text, .sub-head, .note { max-width: var(--col); }
.kicker, .act-label {
  font: 600 12px/1 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px;
}
.act1 .act-label { color: var(--a1); }
.act2 .act-label { color: var(--a2); }
.act3 .act-label { color: var(--a3); }
h1 { font: 500 clamp(56px, 9vw, 104px)/1.08 var(--serif); letter-spacing: -0.02em; margin: 0 0 16px; }
.hero .kicker { margin-bottom: 18px; }
h2 { font: 500 clamp(34px, 5vw, 48px)/1.05 var(--serif); letter-spacing: -0.01em; margin: 0 0 16px; }
.deck { font: 400 clamp(19px, 2.2vw, 23px)/1.5 var(--serif); color: var(--ink-2); max-width: 760px; margin: 0 0 40px; }
.lede { font: 400 19px/1.6 var(--serif); color: var(--ink-2); margin: 0 0 28px; }
.lede strong { color: var(--ink); font-weight: 600; }
.sub-head { font: 500 26px/1.2 var(--serif); margin: 56px 0 8px; }
.body-text { color: var(--ink-2); margin: 0 0 20px; }
.note { color: var(--muted); font-size: 14px; margin: 20px 0 0; }
.byline { color: var(--muted); font-size: 14px; margin: 28px 0 0; }
.byline strong { color: var(--ink-2); }

/* ---------------------------------------------------------------- hero clock */
.hero-clock {
  margin: 0 0 32px; background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  padding: 22px 24px 18px; max-width: 860px; box-shadow: 0 1px 0 var(--border), 0 18px 40px -28px rgba(0,0,0,.25);
}
.clock-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 10px; }
.clock-q { font: 500 20px var(--serif); }
.clock-step { font: 500 13px var(--mono); color: var(--a1); white-space: nowrap; }
.clock-answer {
  min-height: 6.6em; font-size: 15px; line-height: 1.65; white-space: pre-wrap; overflow-wrap: anywhere;
  color: var(--ink); transition: opacity .35s ease;
}
.clock-answer.fade { opacity: 0; }
.clock-answer .cursor { display: inline-block; width: 8px; height: 1.1em; vertical-align: -2px; background: var(--a1); animation: blink 1s steps(1) infinite; margin-left: 1px; }
@keyframes blink { 50% { opacity: 0; } }
.clock-track { display: flex; gap: 3px; margin: 14px 0 10px; height: 6px; }
.clock-track i { flex: 1; border-radius: 3px; background: var(--grid); transition: background .3s; }
.clock-track i.on { background: var(--a1); }
.clock-track i.dpo.on { background: var(--a2); }
.hero-clock figcaption { font-size: 13px; color: var(--muted); }

.act-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 1080px; }
.act-card {
  display: grid; gap: 4px; padding: 16px 18px; text-decoration: none; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); border-top: 3px solid var(--a1);
  transition: transform .2s ease, box-shadow .2s ease;
}
.act-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -18px rgba(0,0,0,.35); }
.act-card.a2 { border-top-color: var(--a2); }
.act-card.a3 { border-top-color: var(--a3); }
.act-num { font: 600 13px var(--serif); color: var(--muted); }
.act-title { font: 500 20px/1.2 var(--serif); }
.act-sub { font-size: 14px; color: var(--ink-2); line-height: 1.45; }

/* ---------------------------------------------------------------- scrubber */
.scrubber {
  position: sticky; top: 56px; z-index: 10; background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); padding: 12px 0 8px; margin: 0 0 12px;
}
.scrubber.compact { position: static; background: none; backdrop-filter: none; padding: 4px 0 4px; }
.scrub-row { display: flex; align-items: center; gap: 14px; }
.play {
  flex: none; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface);
  display: grid; place-items: center; cursor: pointer; color: var(--ink);
}
.play .i-pause { display: none; }
.play.playing .i-play { display: none; }
.play.playing .i-pause { display: inline; }
.scrub-track-wrap { position: relative; flex: 1; height: 44px; }
.scrub-track-wrap input[type=range] {
  position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; background: none; -webkit-appearance: none; appearance: none;
  z-index: 2;
}
.scrub-track-wrap input[type=range]::-webkit-slider-runnable-track { height: 2px; background: var(--axis); border-radius: 1px; }
.scrub-track-wrap input[type=range]::-moz-range-track { height: 2px; background: var(--axis); border-radius: 1px; }
.scrub-track-wrap input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; margin-top: -8px; border-radius: 50%; background: var(--accent, var(--a1));
  border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--border), 0 2px 6px rgba(0,0,0,.25);
}
.scrub-track-wrap input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%; background: var(--accent, var(--a1)); border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--border);
}
.act1 { --accent: var(--a1); }
.act2 { --accent: var(--a2); }
.act3 { --accent: var(--a3); }
.scrub-ticks { position: absolute; left: 9px; right: 9px; top: 10px; height: 8px; pointer-events: none; }
.scrub-ticks i { position: absolute; width: 1px; height: 6px; background: var(--axis); transform: translateX(-0.5px); }
.scrub-ticks i.mk { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); top: 8px; transform: translateX(-4px); box-shadow: 0 0 0 2px var(--page); }
.scrub-ticks i.passed:not(.mk) { background: var(--accent); }
.scrub-stages { position: absolute; left: 9px; right: 9px; bottom: 0; height: 14px; pointer-events: none; font-size: 11px; color: var(--muted); }
.scrub-stages span { position: absolute; transform: translateX(-50%); white-space: nowrap; letter-spacing: 0.04em; }
.scrub-stages b { position: absolute; top: 2px; width: 1px; height: 10px; background: var(--axis); }
.scrub-readout { display: flex; gap: 12px; align-items: baseline; padding-left: 52px; min-height: 22px; font-size: 14px; }
.scrub-readout > span:first-child { font: 500 14px var(--mono); color: var(--ink); }

/* ---------------------------------------------------------------- chips & tabs */
.prompt-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 14px; }
.prompt-chips button, .chips button, .persona-tabs button {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 6px 12px; cursor: pointer;
  font-size: 14px; color: var(--ink-2); transition: background .15s, border-color .15s, color .15s;
}
.prompt-chips.small button { font-size: 13px; padding: 4px 10px; }
.prompt-chips button:hover, .chips button:hover, .persona-tabs button:hover { color: var(--ink); border-color: var(--axis); }
.prompt-chips button[aria-selected=true], .chips button[aria-pressed=true], .persona-tabs button[aria-selected=true] {
  background: var(--ink); color: var(--surface); border-color: var(--ink);
}
.persona-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 6px; }
.persona-tabs button { display: grid; text-align: left; border-radius: 12px; padding: 10px 14px; gap: 2px; }
.persona-tabs button small { font-size: 12px; opacity: .75; }

/* ---------------------------------------------------------------- panels */
.panel {
  margin: 0 0 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px;
}
figure.panel { margin: 0 0 16px; }
.fig-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.fig-grid > .panel { margin: 0; }
.fig-grid + .panel, .fig-grid + figure { margin-top: 16px; }
.fig-title { font: 500 19px/1.3 var(--serif); margin: 0 0 2px; }
.fig-sub { font-size: 14px; color: var(--muted); margin: 0 0 12px; }
figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; }
.stat-line { font-size: 14px; color: var(--ink-2); margin: 8px 0 0; }
.stat-line b { font-weight: 600; color: var(--ink); }

/* time-lapse answer */
.answer-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; margin-bottom: 10px; flex-wrap: wrap; }
.answer-prompt { font: 500 18px var(--serif); }
.answer-meta { font-size: 13px; }
.answer {
  font-size: 14px; line-height: 1.75; white-space: pre-wrap; overflow-wrap: anywhere; min-height: 9em; max-height: 26em;
  overflow-y: auto; padding: 2px 2px 2px 0;
}
.answer .tok { border-radius: 3px; transition: background-color .25s ease; }
.answer .tok:hover, .answer .tok.pinned { outline: 1.5px solid var(--ink-2); outline-offset: 0; }
.answer .trunc { color: var(--muted); font-style: italic; }
.answer .empty { color: var(--muted); font-style: italic; font-family: var(--sans); }
.shade-key { display: inline-flex; gap: 2px; vertical-align: -2px; margin-right: 6px; }
.shade-key i { width: 14px; height: 12px; border-radius: 2px; }
.shade-key .s0 { background: rgba(var(--shade), 0.0); box-shadow: inset 0 0 0 1px var(--border); }
.shade-key .s1 { background: rgba(var(--shade), 0.12); }
.shade-key .s2 { background: rgba(var(--shade), 0.24); }
.shade-key .s3 { background: rgba(var(--shade), 0.38); }
.shade-key .s4 { background: rgba(var(--shade), 0.55); }
.moment {
  margin: 12px 0 0; padding: 10px 12px; border-left: 3px solid var(--accent); background: var(--surface-2);
  border-radius: 0 6px 6px 0; font-size: 14px; color: var(--ink-2);
}

/* charts */
.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart text { font-family: var(--sans); fill: var(--muted); font-size: 11px; }
.chart .grid line { stroke: var(--grid); stroke-width: 1; }
.chart .axis line, .chart .axis path { stroke: var(--axis); stroke-width: 1; }
.chart .label-ink { fill: var(--ink-2); }
.chart .label-strong { fill: var(--ink); font-weight: 600; }
.chart .series-line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .series-faint { fill: none; stroke-width: 1; opacity: .35; }
.chart .cursor-line { stroke: var(--ink-2); stroke-width: 1; }
.chart .hover-line { stroke: var(--muted); stroke-width: 1; }
.chart .region { fill: var(--surface-2); }
.chart .dot { stroke: var(--surface); stroke-width: 2; }
.legend { display: flex; flex-wrap: wrap; gap: 2px 14px; font-size: 13px; color: var(--ink-2); margin: 0 0 6px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 14px; height: 2px; border-radius: 1px; display: inline-block; }
.legend i.box { height: 10px; width: 10px; border-radius: 2px; }
.table-toggle { border: 0; background: none; padding: 0; color: var(--muted); font-size: 12px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; margin-top: 8px; }
table.data { border-collapse: collapse; font-size: 12px; margin-top: 8px; width: 100%; font-variant-numeric: tabular-nums; }
table.data th, table.data td { text-align: right; padding: 3px 8px; border-bottom: 1px solid var(--grid); }
table.data th:first-child, table.data td:first-child { text-align: left; }
.table-wrap { max-height: 260px; overflow: auto; }

.multiples { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px 18px; }
.multiples.wide { grid-template-columns: repeat(3, 1fr); }
.multiple h4 { font: 600 12px var(--sans); color: var(--ink-2); margin: 0 0 2px; display: flex; justify-content: space-between; gap: 8px; }
.multiple h4 .val { font-weight: 500; color: var(--ink); font-variant-numeric: tabular-nums; }
.multiple.target h4 { color: var(--ink); }

/* jokes */
.joke-list { display: grid; gap: 8px; }
.joke { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; font-size: 14px; }
.joke .jt { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--ink); }
.joke .jt::first-letter { text-transform: uppercase; }
.joke .jn { font-variant-numeric: tabular-nums; color: var(--ink-2); font-size: 13px; }
.joke .jb { grid-column: 1 / -1; height: 6px; background: var(--surface-2); border-radius: 3px; overflow: hidden; }
.joke .jb i { display: block; height: 100%; background: var(--accent); border-radius: 0 3px 3px 0; transition: width .4s ease; }
.joke-summary { font-size: 14px; color: var(--ink-2); margin: 10px 0 0; }

/* weights (Bradley-Terry) */
.weights { display: grid; gap: 10px; }
.weight { display: grid; grid-template-columns: 112px 1fr 52px; gap: 10px; align-items: center; font-size: 14px; }
.weight .wn { color: var(--ink-2); }
.weight .wv { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink); }
.weight .wbar { position: relative; height: 18px; }
.weight .wbar::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: var(--axis); }
.weight .wbar i { position: absolute; top: 4px; height: 10px; border-radius: 3px; transition: left .35s ease, width .35s ease; }
.weight .wbar i.pos { background: var(--s1); }
.weight .wbar i.neg { background: var(--s2); }
.weight.stated .wn::after { content: " ★"; color: var(--a2); }

/* judge */
.judge { padding: 22px; }
.judge-q { font: 500 18px var(--serif); margin: 0 0 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.btn {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 9px 18px; cursor: pointer;
  font-size: 15px; font-weight: 500;
}
.btn.primary { background: var(--a2); border-color: var(--a2); color: #fff; }
.btn:hover { filter: brightness(1.05); }
.judge-progress { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.dots { display: flex; gap: 4px; }
.dots i { width: 8px; height: 8px; border-radius: 50%; background: var(--grid); }
.dots i.done { background: var(--a2); }
.judge-prompt { font: 500 21px/1.3 var(--serif); margin: 0 0 14px; }
.pair-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.answer-card {
  text-align: left; border: 1px solid var(--border); background: var(--page); border-radius: var(--radius); padding: 14px 16px;
  cursor: pointer; display: grid; gap: 8px; align-content: start; transition: border-color .15s, transform .15s, box-shadow .15s;
  max-height: 420px; overflow-y: auto;
}
.answer-card:hover { border-color: var(--a2); box-shadow: 0 0 0 1px var(--a2); }
.answer-card.picked { transform: scale(0.99); box-shadow: 0 0 0 2px var(--a2); }
.ac-label { font: 600 12px var(--sans); letter-spacing: .1em; color: var(--muted); }
.ac-text { font-size: 13px; line-height: 1.65; white-space: pre-wrap; overflow-wrap: anywhere; }
.hint { font-size: 13px; margin: 12px 0 0; }
.linkish { border: 0; background: none; padding: 0; color: var(--a2); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; font-size: 13px; margin-left: 8px; }
.reveal-text { font: 400 17px/1.6 var(--serif); color: var(--ink-2); margin: 16px 0 18px; max-width: 640px; }
.reveal-text strong { color: var(--ink); }

/* RLVR */
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 0 0 16px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.kpi .kl { font-size: 13px; color: var(--muted); }
.kpi .kv { font: 600 30px/1.2 var(--sans); }
.kpi .kd { font-size: 13px; color: var(--ink-2); }
.behavior-key { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 13px; color: var(--ink-2); margin: 6px 0 10px; }
.behavior-key span { display: inline-flex; align-items: center; gap: 6px; }
.behavior-key i { width: 14px; height: 3px; border-radius: 2px; }
.traces { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.trace { border: 1px solid var(--border); border-radius: var(--radius); background: var(--page); padding: 12px 14px; display: grid; gap: 8px; align-content: start; }
.trace-head { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }
.verdict { font-weight: 600; display: inline-flex; gap: 4px; align-items: center; }
.verdict.ok { color: var(--good-text); }
.verdict.bad { color: var(--critical); }
.trace-text { font: 12.5px/1.65 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; max-height: 300px; overflow-y: auto; }
.trace-text mark { background: none; color: inherit; border-bottom: 2px solid var(--b, var(--axis)); padding-bottom: 1px; }
.trace-text .ans { background: var(--surface-2); border-radius: 3px; padding: 0 3px; }
.exhibit .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; }
.exhibit .after { color: var(--muted); }
.exhibit .after .user { color: var(--critical); font-weight: 500; }
.exhibit .trace-text { max-height: 340px; }

/* methods */
table.spec { width: 100%; border-collapse: collapse; font-size: 14px; margin: 0 0 24px; }
table.spec th { text-align: left; font: 600 12px var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding: 8px 10px; border-bottom: 1px solid var(--axis); }
table.spec td { padding: 10px; border-bottom: 1px solid var(--grid); vertical-align: top; color: var(--ink-2); }
table.spec td:first-child { color: var(--ink); font-weight: 500; white-space: nowrap; }
table.spec td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.methods h3 { font: 500 22px var(--serif); margin: 32px 0 10px; }
.methods ul { color: var(--ink-2); padding-left: 20px; max-width: var(--col); }
.methods li { margin: 6px 0; }
.meter { height: 10px; border-radius: 5px; background: color-mix(in srgb, var(--a1) 18%, var(--surface-2)); overflow: hidden; max-width: 420px; }
.meter i { display: block; height: 100%; background: var(--a1); border-radius: 0 5px 5px 0; }
.budget { display: grid; gap: 6px; margin: 8px 0 24px; }
.budget .big { font: 600 34px/1.1 var(--sans); }
.scroll-x { overflow-x: auto; }

.under-hood { margin: 8px 0 0; max-width: var(--col); color: var(--ink-2); font-size: 15px; }
.under-hood summary { cursor: pointer; color: var(--ink); font-weight: 500; padding: 8px 0; }
.under-hood ul { padding-left: 20px; }

/* tooltip */
.tooltip {
  position: fixed; z-index: 50; pointer-events: none; background: var(--surface); color: var(--ink); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; font-size: 12px; line-height: 1.45; box-shadow: 0 8px 24px -10px rgba(0,0,0,.35);
  max-width: 280px; font-variant-numeric: tabular-nums;
}
.tooltip .tv { font-weight: 600; font-size: 13px; }
.tooltip .tl { color: var(--ink-2); }
.tooltip .row { display: flex; align-items: center; gap: 6px; }
.tooltip .key { width: 12px; height: 2px; border-radius: 1px; display: inline-block; }
.tooltip .tok-shown { font-family: var(--mono); background: var(--surface-2); padding: 0 4px; border-radius: 3px; }

.site-foot { max-width: var(--wide); margin: 56px auto 0; padding: 24px 16px 48px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .fig-grid, .pair-cols, .traces, .exhibit .cols { grid-template-columns: 1fr; }
  .act-cards { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .multiples.wide { grid-template-columns: 1fr; }
  .chapters .lbl { display: none; }
  .chapters a[data-act="m"] .lbl { display: inline; }
  .chapters a .num { font-size: 15px; }
}
@media (max-width: 560px) {
  .prompt-chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin-left: -16px; margin-right: -16px; padding: 0 16px 4px; }
  .prompt-chips button { flex: none; }
  .hero { padding-top: 40px; }
  .act { padding-top: 48px; }
  .hero-clock { padding: 16px; }
  .panel { padding: 14px; }
  .weight { grid-template-columns: 90px 1fr 44px; font-size: 13px; }
  .scrub-readout { padding-left: 0; flex-direction: column; gap: 0; }
  .topbar { gap: 10px; }
  .chapters a { padding: 6px 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

.multiples.wide .legend { min-height: 44px; align-content: flex-start; }
.trace-text .pre { color: var(--muted); }
.kpis.three { grid-template-columns: repeat(3, 1fr); margin: 14px 0; }
.kpis.three .kv { font-size: 24px; }
table.spec.cmp td.ok { color: var(--good-text); font-weight: 600; white-space: nowrap; }
table.spec.cmp td.bad { color: var(--critical); font-weight: 600; white-space: nowrap; }
table.spec.cmp td.mono { font-size: 13px; }
@media (max-width: 900px) { .kpis.three { grid-template-columns: 1fr; } }
.fig-grid.inner { gap: 24px; }
.mini-title { font: 600 12px var(--sans); color: var(--ink-2); margin: 0 0 4px; }
.chart .ci { stroke-width: 2; stroke-linecap: round; }

/* ================================================================ simplification pass */
.howto { font-size: 15px; color: var(--ink); font-weight: 500; margin: -12px 0 8px; }
.howto::before { content: "→ "; color: var(--accent); }

/* glossary terms */
.term { border-bottom: 1.5px dotted var(--muted); cursor: help; }
.term:hover, .term:focus-visible { border-bottom-color: var(--accent, var(--a1)); outline: none; }

/* chat bubbles: clearly a transcript, not an input */
.chat { display: grid; gap: 10px; }
.bubble { display: grid; gap: 4px; max-width: 92%; padding: 12px 16px; border-radius: 16px; font-size: 16px; line-height: 1.55; }
.bubble .who { font: 600 11px var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.bubble.user { justify-self: end; background: var(--surface-2); border-bottom-right-radius: 4px; }
.bubble.model { justify-self: start; background: color-mix(in srgb, var(--a1) 9%, var(--surface)); border: 1px solid color-mix(in srgb, var(--a1) 22%, transparent); border-bottom-left-radius: 4px; }
.act2 .bubble.model { background: color-mix(in srgb, var(--a2) 8%, var(--surface)); border-color: color-mix(in srgb, var(--a2) 22%, transparent); }
.bubble .said { white-space: pre-wrap; overflow-wrap: anywhere; }
.bubble.model .said { font-family: var(--mono); font-size: 14px; font-variant-ligatures: none; }
.chat.compact .bubble { font-size: 15px; }
.chat.compact .bubble.model { max-width: 100%; justify-self: stretch; }
.bubble .answer { min-height: 3em; max-height: 24em; }
.swap { animation: swapin .35s ease; }
@keyframes swapin { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }

/* hero demo */
.demo { max-width: 860px; margin: 0 0 32px; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 18px 20px 14px; box-shadow: 0 18px 40px -30px rgba(0,0,0,.3); }
.demo .chat { min-height: 210px; align-content: start; margin: 12px 0 10px; }
.demo-qs { display: flex; flex-wrap: wrap; gap: 6px; }
.demo-qs button { border: 1px solid var(--border); background: var(--page); border-radius: 999px; padding: 5px 12px; cursor: pointer; font-size: 13px; color: var(--ink-2); }
.demo-qs button[aria-selected=true] { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.train { padding-top: 6px; border-top: 1px solid var(--border); }
.train-track-wrap { position: relative; height: 40px; margin-top: 6px; }
.train-track-wrap input[type=range] { position: absolute; inset: 0; width: 100%; margin: 0; background: none; -webkit-appearance: none; appearance: none; z-index: 2; }
.train-track-wrap::before { content: ""; position: absolute; left: 0; right: 0; top: 16px; height: 8px; border-radius: 4px; background: var(--surface-2); box-shadow: inset 0 0 0 1px var(--border); }
.train-track-wrap input[type=range]::-webkit-slider-runnable-track { height: 8px; background: transparent; }
.train-track-wrap input[type=range]::-moz-range-track { height: 8px; background: transparent; }
.train-track-wrap input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 28px; height: 28px; margin-top: -10px; border-radius: 50%; background: var(--a1); border: 4px solid var(--surface); box-shadow: 0 0 0 1px var(--border), 0 4px 12px rgba(0,0,0,.25); }
.train-track-wrap input[type=range]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: var(--a1); border: 4px solid var(--surface); box-shadow: 0 0 0 1px var(--border); }
.train-fill { position: absolute; left: 0; top: 16px; max-width: 100%; height: 8px; border-radius: 4px; background: var(--a1); pointer-events: none; z-index: 1; transition: width .25s ease; }
.train-labels { display: flex; font-size: 12px; color: var(--muted); }
.train-labels span { border-left: 1px solid var(--axis); padding-left: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.train-labels span:first-child { border-left: 0; padding-left: 0; }
.drag-hint { margin: 8px 0 0; text-align: center; font-size: 13px; font-weight: 600; color: var(--a1); letter-spacing: .02em; animation: nudge 1.6s ease-in-out infinite; transition: opacity .4s; }
.drag-hint.quiet { opacity: 0; animation: none; }
@keyframes nudge { 0%, 100% { transform: translateX(-4px); } 50% { transform: translateX(4px); } }

/* scorecard */
.scorecard { display: grid; gap: 22px; margin-top: 6px; }
.score-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 8px; }
.score-name { font-size: 15px; color: var(--ink); }
.score-name .term { font-size: 12px; color: var(--muted); }
.score-val { font: 600 22px var(--sans); color: var(--ink); }
.score-track { position: relative; height: 12px; border-radius: 6px; background: var(--surface-2); margin-bottom: 26px; }
.score-fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 6px; background: var(--accent); transition: width .35s ease; }
.score-mark { position: absolute; top: -4px; width: 2px; height: 20px; transform: translateX(-1px); background: var(--muted); }
.score-mark.ref { background: var(--ink); }
.score-mark-label { position: absolute; top: 22px; left: 50%; transform: translateX(-50%); font-size: 11px; color: var(--muted); white-space: nowrap; }
.score-mark.ref .score-mark-label { color: var(--ink-2); }
.spark { height: 34px; }
.spark svg { display: block; width: 100%; height: 34px; }

/* ask buttons */
.ask-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 6px 0 10px; }
.btn.ask { font-size: 14px; padding: 8px 14px; border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.btn.ask:hover { background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }
.ask-out { font-size: 30px; font-weight: 500; color: var(--accent); }
.ask-joke { min-height: 1.6em; font: 400 17px/1.5 var(--serif); color: var(--ink); margin: 0 0 12px; white-space: pre-wrap; }
.pop { animation: pop .35s ease; }
@keyframes pop { 0% { transform: scale(.9); opacity: 0; } 100% { transform: none; opacity: 1; } }

/* try-it */
.tryit-puzzle { font: 500 22px var(--serif); margin: 10px 0 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.tryit-puzzle b { font: 600 26px var(--sans); color: var(--a3); }
.num-chip { display: inline-grid; place-items: center; min-width: 40px; height: 36px; padding: 0 10px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--border); font: 600 18px var(--mono); }
.tryit-row { display: flex; gap: 8px; flex-wrap: wrap; }
.tryit-row input { flex: 1 1 240px; font-size: 16px; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--axis); background: var(--page); color: var(--ink); }
.tryit-row input:focus { outline: 2px solid var(--a3); outline-offset: 1px; }
.tryit .btn.primary { background: var(--a3); border-color: var(--a3); }
.tryit-result { margin: 12px 0 0; font-size: 15px; color: var(--ink-2); min-height: 1.5em; }
.tryit-result .verdict { margin-right: 4px; }
.tryit-result .linkish { color: var(--a3); margin: 8px 0 0; font-size: 14px; }

/* section 2 training controls */
.train-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 8px 0 14px; }
.train-controls .btn.primary:disabled { opacity: .55; cursor: default; filter: none; }
.round-dots { display: flex; gap: 5px; }
.round-dots button { width: 26px; height: 26px; padding: 0; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--muted); font: 600 12px var(--sans); cursor: pointer; }
.round-dots button.done { background: color-mix(in srgb, var(--a2) 22%, var(--surface)); color: var(--ink); border-color: transparent; }
.round-dots button.on { background: var(--a2); color: #fff; }
.weights-axis { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); padding: 0 52px 0 122px; margin-bottom: 4px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; padding: 3px; gap: 2px; margin: 0 0 12px; background: var(--page); }
.seg button { border: 0; background: none; border-radius: 999px; padding: 5px 12px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.seg button[aria-selected=true] { background: var(--ink); color: var(--surface); }
@media (max-width: 560px) {
  .weights-axis { padding: 0 44px 0 100px; }
  .bubble { max-width: 100%; }
  .demo { padding: 14px; }
  .tryit-puzzle { font-size: 18px; }
}

/* stepper: a slider whose every stop is labeled */
.stepper-host { flex: 1; min-width: 0; }
.stepper { overflow-x: auto; scrollbar-width: thin; padding: 2px 0 2px; }
.st-inner { position: relative; height: 70px; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.st-groups { position: absolute; left: 0; right: 0; top: 0; height: 17px; }
.st-group { position: absolute; top: 0; height: 17px; border-bottom: 1px solid var(--axis); text-align: center; font-size: 11px; line-height: 13px; color: var(--muted); white-space: nowrap; padding: 0 4px; }
.st-group.first { border-bottom: 0; text-align: left; padding-left: 0; }
.st-rail { position: absolute; top: 33px; height: 4px; border-radius: 2px; background: var(--surface-2); box-shadow: inset 0 0 0 1px var(--border); }
.st-fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 2px; background: var(--accent, var(--a1)); transition: width .2s ease; }
.st-stops { position: absolute; inset: 20px 0 0 0; }
.st-stop { position: absolute; top: 0; transform: translateX(-50%); width: 30px; height: 46px; padding: 0; border: 0; background: none; display: grid; justify-items: center; align-content: start; gap: 3px; }
.st-dot { width: 12px; height: 12px; margin-top: 9px; border-radius: 50%; background: var(--surface); border: 2px solid var(--axis); transition: transform .15s, background .15s, border-color .15s; }
.st-stop.past .st-dot { background: var(--accent, var(--a1)); border-color: var(--accent, var(--a1)); }
.st-stop.on .st-dot { width: 18px; height: 18px; margin-top: 6px; background: var(--accent, var(--a1)); border: 3px solid var(--surface); box-shadow: 0 0 0 2px var(--accent, var(--a1)); }
.st-stop:hover .st-dot { border-color: var(--accent, var(--a1)); }
.st-stop.mark .st-label::after { content: "•"; color: var(--accent, var(--a1)); margin-left: 1px; }
.st-label { font: 500 11px var(--sans); color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.st-stop.on .st-label { color: var(--ink); font-weight: 700; }
.st-stop:focus-visible { outline: none; }
.st-stop:focus-visible .st-dot { box-shadow: 0 0 0 3px var(--accent, var(--a1)); }
.demo .st-inner { height: 72px; }
.demo .st-stop .st-label { font-size: 12px; }
.train { --accent: var(--a1); }

.cards-intro { font-size: 15px; color: var(--ink-2); margin: 0 0 12px; max-width: var(--col); }
.act-tag { justify-self: start; margin-top: 6px; font: 600 11px var(--sans); letter-spacing: .04em; color: var(--ink-2); background: var(--surface-2); border-radius: 999px; padding: 3px 9px; }