:root {
  color-scheme: light;
  --ink: #303033;
  --muted: #747178;
  --soft-ink: #605d64;
  --label: #82788d;
  --accent: #6a4791;
  --accent-wash: #f6f2fa;
  --line: #eae7ee;
  --panel: #faf9fc;
  --panel-line: #eeebf2;
  --warn: #c26a3d;
  --ball: #f08a3a;
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
body { margin: 0; background: #fff; color: var(--ink); font-size: 16px; line-height: 1.75; }
a { color: var(--accent); text-underline-offset: 3px; }
button { font: inherit; }
button, a, video, pre { outline-offset: 5px; }
:focus-visible { outline: 3px solid #9579b0; }
h1, h2, h3, h4, p, figure { margin: 0; }
h1, h2, h3, h4 { font-family: "Montserrat", sans-serif; }
.container { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.text-container { width: min(800px, calc(100% - 48px)); margin-inline: auto; }

/* Hero */
.hero { padding: 54px 0 46px; text-align: center; }
h1 { max-width: 1120px; margin: 0 auto; font-size: 44px; font-weight: 600; letter-spacing: -1.4px; line-height: 1.2; text-wrap: balance; }
.project-name { color: var(--accent); white-space: nowrap; }
.authors { display: flex; justify-content: center; flex-wrap: wrap; gap: 4px 23px; margin-top: 29px; color: #626064; font-size: 18px; }
.authors span, .authors a { white-space: nowrap; }
.authors a { color: var(--accent); text-decoration: none; }
.authors a:hover, .authors a:focus-visible { text-decoration: underline; }
.affiliation { display: flex; justify-content: center; margin-top: 21px; }
.affiliation a { display: inline-flex; align-items: center; justify-content: center; gap: 10px; color: #626064; font-size: 16px; line-height: 1.6; text-decoration: none; }
.affiliation a:hover span { color: var(--accent); }
.affiliation-break { display: none; }
.affiliation img { display: block; flex: 0 0 auto; width: 38px; height: auto; }
.paper-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 19px; }
.pill { display: inline-flex; align-items: center; justify-content: center; gap: 9px; border-radius: 999px; background: #343437; color: white; text-decoration: none; padding: 8px 23px; min-height: 43px; font-size: 15px; font-weight: 500; transition: background .15s; }
.pill:hover { background: #505055; }
.pill svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tldr { max-width: 700px; margin: 30px auto 0; color: #55525a; font-size: 17px; line-height: 1.75; text-wrap: pretty; }

/* Shared section pieces */
h2 { font-size: 29px; font-weight: 600; letter-spacing: -.8px; line-height: 1.35; text-align: center; }
h3 { font-size: 17px; font-weight: 600; letter-spacing: -.3px; }
h4 { font-size: 15px; font-weight: 600; letter-spacing: -.3px; }
.section-intro { margin-bottom: 23px; text-align: center; }
.section-intro p { max-width: 640px; margin: 6px auto 0; font-size: 14px; color: var(--muted); text-wrap: pretty; }
.abstract, .motivation, .method, .worlds, .results, .examples, .citation { margin-top: 72px; }
.video-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.video-wrap { position: relative; aspect-ratio: 16 / 9; border-radius: 9px; overflow: hidden; background: #f7f7f6; border: 1px solid #0000000c; }
.video-wrap video { display: block; width: 100%; height: 100%; object-fit: contain; }
.video-error { position: absolute; bottom: 0; left: 0; right: 0; background: white; padding: 10px; font-size: 13px; }
.scene figcaption { padding: 12px 1px 0; }
.scene figcaption p { color: var(--muted); font-size: 13px; line-height: 1.65; margin-top: 3px; }
.scene-note { font-size: 11px; color: var(--muted); text-align: center; margin-top: 19px; }
.opt-letter { display: inline-grid; place-items: center; flex: none; width: 24px; height: 24px; border-radius: 50%; background: #f1eef5; color: #6c6474; font: 600 11.5px/1 "Montserrat", sans-serif; }

/* Counterfactual comparison */
.cf-stage { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.cf-run .video-wrap video { position: absolute; inset: 0; }
.cf-run video[data-run="edit"]:not(.is-active) { visibility: hidden; }
.cf-run figcaption { display: flex; align-items: center; justify-content: center; gap: 9px; padding-top: 12px; font-size: 14px; color: #55525a; }
.cf-run figcaption strong { color: var(--ink); font-weight: 600; }
.ball-dot { flex: none; width: 10px; height: 10px; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #f6ad72, var(--ball) 60%, #d9732a); }
.run-tag { position: absolute; z-index: 1; bottom: 11px; left: 11px; padding: 2px 11px; border: 1px solid #0000000f; border-radius: 999px; background: #ffffffe0; color: #4b4850; font-size: 12px; font-weight: 500; line-height: 1.7; }
.run-tag.is-edit { color: var(--accent); }
.cf-toggle { position: absolute; z-index: 1; right: 10px; bottom: 10px; display: grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 0; border-radius: 50%; background: #2d2b30b8; cursor: pointer; transition: background .15s; }
.cf-toggle:hover { background: #2d2b30; }
.cf-toggle::before { content: ""; width: 10px; height: 11px; border-inline: 3px solid #fff; }
.cf-toggle[data-action="play"]::before { width: 10px; height: 12px; margin-left: 2px; border: 0; background: #fff; clip-path: polygon(10% 0, 100% 50%, 10% 100%); }
.task-card { max-width: 800px; margin: 26px auto 0; padding: 22px 24px 18px; border: 1px solid var(--panel-line); border-radius: 12px; background: var(--panel); }
.task-head { display: flex; justify-content: space-between; gap: 12px; color: var(--label); font-size: 11.5px; font-weight: 500; }
.task-question { margin-top: 6px; font: 600 18px/1.45 "Montserrat", sans-serif; letter-spacing: -.3px; text-wrap: balance; }
.task-options { display: grid; gap: 8px; margin-top: 16px; }
.task-option { display: grid; grid-template-columns: 24px minmax(0, 1fr) auto; align-items: center; gap: 12px; width: 100%; min-height: 46px; padding: 9px 14px; border: 1px solid #e6e2ec; border-radius: 9px; background: #fff; color: var(--ink); font-size: 14.5px; line-height: 1.5; text-align: left; cursor: pointer; transition: border-color .15s, box-shadow .15s; }
.task-option:hover { border-color: #cdc3d9; }
.task-option[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 3px #6a479117; }
.task-option.is-static { cursor: default; border-style: dashed; background: transparent; color: #77727d; }
.task-option.is-answer .opt-letter { background: var(--accent); color: #fff; }
.opt-result { display: inline-flex; align-items: center; gap: 4px; color: #7d7586; font-size: 12.5px; white-space: nowrap; }
.opt-result svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.is-answer .opt-result { color: var(--accent); font-weight: 600; }
.task-foot { margin-top: 14px; color: #706977; font-size: 12.5px; line-height: 1.7; }

/* Abstract */
.abstract > p { margin-top: 20px; line-height: 1.9; font-size: 16px; }

/* Why naive self-play fails */
.wide-figure img { display: block; width: 100%; height: auto; }
.failure-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 36px; max-width: 920px; margin: 34px auto 0; }
.failure { position: relative; padding-left: 42px; }
.failure-index { position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid #e1dce7; border-radius: 50%; color: var(--accent); font: 600 12.5px/1 "Montserrat", sans-serif; }
.failure h3 { font-size: 16px; line-height: 1.75; }
.failure p { margin-top: 4px; color: var(--soft-ink); font-size: 15px; line-height: 1.75; }
.audit { max-width: 920px; margin: 32px auto 0; }
.audit h3 { color: var(--label); font: 500 12px/1.6 "Noto Sans", sans-serif; letter-spacing: 0; text-align: center; }
.audit-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 10px; }
.audit-cell { padding: 16px 18px 14px; border: 1px solid var(--panel-line); border-radius: 10px; background: var(--panel); }
.audit-task { font: 600 15px/1.4 "Montserrat", sans-serif; letter-spacing: -.3px; }
.audit-cell dl { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 10px 0 0; }
.audit-cell dt { color: var(--label); font-size: 11px; line-height: 1.4; }
.audit-cell dd { margin: 3px 0 0; color: #8f8996; font: 600 24px/1.2 "Montserrat", sans-serif; font-variant-numeric: tabular-nums; }
.audit-cell dd.is-low { color: var(--warn); }
.audit-cell p { margin-top: 9px; color: #706977; font-size: 12px; line-height: 1.5; }

/* Method */
.method figure { margin-top: 26px; }
.method-link { display: block; border-radius: 8px; }
.method img { display: block; width: 100%; height: auto; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px 36px; max-width: 1000px; margin: 34px auto 0; padding: 0; list-style: none; }
.steps li { padding-top: 15px; border-top: 1px solid var(--line); }
.step-index { color: var(--accent); font: 600 12px/1 "Montserrat", sans-serif; letter-spacing: .08em; }
.steps h3 { margin-top: 9px; }
.steps p { margin-top: 5px; color: var(--soft-ink); font-size: 14.5px; line-height: 1.75; }

/* Results */
.results .section-intro { margin-bottom: 15px; }
.chart-legend { display: flex; justify-content: center; gap: 22px; font-size: 12px; color: #69636f; margin-bottom: 20px; }
.chart-legend span { display: inline-flex; align-items: center; gap: 7px; }
.chart-legend i { display: inline-block; height: 9px; width: 16px; border-radius: 2px; }
.base-key { background: #aaa5b3; }
.ours-key { background: var(--accent); }
.results-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.result-panel { background: var(--panel); border: 1px solid var(--panel-line); border-radius: 10px; padding: 20px 18px 15px; }
.benchmark-name { color: var(--label); font-size: 11px; font-weight: 500; }
.result-panel h3 { margin-top: 4px; font-size: 15px; letter-spacing: -.4px; }
.result-gain { font-variant-numeric: tabular-nums; color: var(--accent); font-family: "Montserrat", sans-serif; font-weight: 600; font-size: 26px; margin-top: 8px; }
.result-gain span { font-family: "Noto Sans", sans-serif; font-size: 12px; font-weight: 400; }
.result-panel img { display: block; width: 100%; height: auto; margin-top: 2px; }
.result-sample { color: #706977; font-size: 11px; text-align: center; }
.subsection { max-width: 920px; margin: 52px auto 0; }
.subsection-head { margin-bottom: 18px; text-align: center; }
.subsection-head p { margin-top: 4px; color: var(--muted); font-size: 13px; }

/* Task-level transfer dot plot */
.dp-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 22px; margin-bottom: 14px; color: #69636f; font-size: 12px; }
.dp-legend span { display: inline-flex; align-items: center; gap: 8px; }
.dp-legend .dp-mark { position: static; transform: none; }
.dp-n-key { color: #9a94a1; }
.dp { --task: 196px; --n: 40px; --grid: #efedf2; }
.dp-group + .dp-group { margin-top: 8px; }
.dp-group-name { width: var(--task); padding-right: 14px; color: var(--label); font: 600 11.5px/2.2 "Montserrat", sans-serif; letter-spacing: -.1px; text-align: right; }
.dp-row { display: grid; grid-template-columns: var(--task) minmax(0, 1fr) var(--n); align-items: center; height: 28px; }
.dp-task { padding-right: 14px; color: #4b4850; font-size: 13px; line-height: 1.25; text-align: right; }
.dp-n { color: #9a94a1; font-size: 12px; text-align: right; font-variant-numeric: tabular-nums; }
.dp-track { position: relative; height: 100%; background:
  linear-gradient(#cfc8d8, #cfc8d8) calc(100% / 6) 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) 0 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) calc(200% / 6) 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) 50% 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) calc(400% / 6) 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) calc(500% / 6) 0 / 1px 100% no-repeat,
  linear-gradient(var(--grid), var(--grid)) 100% 0 / 1px 100% no-repeat; }
.dp-mark { position: absolute; top: 50%; left: var(--x); display: inline-block; width: 9px; height: 9px; transform: translate(-50%, calc(-50% + var(--dy, 0px))); }
.dp-mark.base { --dy: -5px; border-radius: 50%; background: #8f8996; }
.dp-mark.naive { width: 8px; height: 8px; border-radius: 1.5px; background: #d08a45; }
.dp-mark.nobranch { --dy: 5px; width: 10px; background: #3b8a9a; clip-path: polygon(50% 0, 100% 100%, 0 100%); }
.dp-axis { height: 26px; margin-top: 2px; border-top: 1px solid #dcd7e2; }
.dp-axis > span:nth-child(2) { align-self: start; }
.dp-ticks { position: relative; display: block; height: 100%; color: #8a8490; font-size: 11px; font-variant-numeric: tabular-nums; }
.dp-ticks span { position: absolute; top: 4px; left: var(--x); transform: translateX(-50%); }

/* Ablations */
.ablation-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.ablation { padding: 20px 22px 20px; border: 1px solid var(--panel-line); border-radius: 10px; background: var(--panel); }
.ablation > p { margin-top: 4px; color: #706977; font-size: 13px; line-height: 1.65; }
.metric { margin-top: 18px; }
.metric-name { display: flex; justify-content: space-between; gap: 12px; color: #4b4850; font-size: 12.5px; font-weight: 500; }
.metric-drop { color: var(--warn); font-variant-numeric: tabular-nums; }
.bar { display: grid; grid-template-columns: 78px minmax(0, 1fr) 44px; align-items: center; gap: 10px; margin-top: 6px; color: #706977; font-size: 11.5px; }
.bar-track { height: 8px; overflow: hidden; border-radius: 4px; background: #ece8f1; }
.bar-fill { display: block; width: var(--v); height: 100%; border-radius: 4px; background: var(--accent); }
.bar.is-ablated .bar-fill { background: #b9b3c1; }
.bar-value { color: var(--ink); font-weight: 500; text-align: right; font-variant-numeric: tabular-nums; }

/* Overall table */
.overall-results { margin: 52px auto 0; max-width: 800px; }
.overall-results h3 { margin-bottom: 12px; font-size: 16px; }
.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { padding: 12px 17px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
th:first-child { text-align: left; }
thead th { font-size: 12px; color: #7d7586; font-weight: 500; background: var(--panel); }
tbody th { font-weight: 500; }
.ours { font-weight: 600; color: var(--accent); }
.delta { color: var(--accent); }
.results-note { max-width: 800px; margin: 15px auto 0; font-size: 12px; line-height: 1.8; color: #706977; }

/* Transfer examples */
.example { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: center; padding: 26px 0; border-top: 1px solid var(--line); }
.example:last-child { border-bottom: 1px solid var(--line); }
.example-frames { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px; padding: 5px; border-radius: 12px; background: #1c1c1f; box-shadow: 0 1px 2px #0000000f, 0 6px 18px -10px #00000033; }
.example-frames img { display: block; width: 100%; height: auto; border-radius: 7px; }
.example-media figcaption { margin-top: 9px; color: #9a94a1; font-size: 11px; text-align: center; }
.example-meta { color: var(--label); font-size: 11.5px; font-weight: 500; }
.example-q { margin-top: 5px; font: 600 16px/1.5 "Montserrat", sans-serif; letter-spacing: -.25px; text-wrap: pretty; }
.example-options { display: grid; gap: 6px; margin: 12px 0 0; padding: 0; list-style: none; color: var(--soft-ink); font-size: 14px; line-height: 1.5; }
.example-options li { display: flex; align-items: center; gap: 10px; }
.example-options .opt-letter { width: 22px; height: 22px; font-size: 11px; }
.example-options .is-gold { color: var(--ink); font-weight: 500; }
.example-options .is-gold .opt-letter { background: var(--accent); color: #fff; }
.example-answers { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 0; padding: 0; list-style: none; }
.answer { display: inline-flex; align-items: center; gap: 6px; padding: 3px 11px; border: 1px solid #e6e2ec; border-radius: 999px; background: #fff; color: #7d7586; font-size: 12px; line-height: 1.7; }
.answer b { color: #4b4850; font-weight: 600; }
.answer.is-correct { border-color: #cbb9de; background: var(--accent-wash); color: var(--accent); }
.answer.is-correct b { color: var(--accent); }

/* Citation */
.citation-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.citation-heading h2 { text-align: left; }
.copy-button { border: 1px solid #e1dce7; border-radius: 7px; background: white; padding: 7px 16px; min-height: 44px; cursor: pointer; font-size: 13px; }
.copy-button:hover { background: #f7f5fa; }
pre { margin: 0; background: #f8f7fa; border: 1px solid var(--line); border-radius: 10px; padding: 24px; overflow-x: auto; font-size: 12px; line-height: 1.8; tab-size: 2; }
code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.copy-status { height: 26px; font-size: 12px; color: var(--muted); margin-top: 6px; }
footer { display: flex; justify-content: space-between; gap: 16px; border-top: 1px solid var(--line); padding: 24px 0 30px; margin-top: 45px; font-size: 11px; color: var(--muted); }
footer > span:first-child { font-weight: 600; }
.skip-link { position: absolute; left: 12px; top: -80px; background: white; padding: 10px; z-index: 5; }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 1000px) {
  h1 { font-size: 38px; letter-spacing: -1.2px; }
  .authors { gap: 4px 18px; font-size: 17px; }
  .results-grid, .video-grid { gap: 14px; }
  .result-panel { padding: 17px 12px 14px; }
  .result-panel h3 { min-height: 44px; }
  .example { grid-template-columns: 1fr; gap: 16px; }
}
@media (max-width: 700px) {
  .container, .text-container { width: calc(100% - 36px); }
  .hero { padding: 36px 0 34px; }
  h1 { font-size: 28px; letter-spacing: -.9px; line-height: 1.22; }
  .authors { font-size: 15px; margin-top: 22px; gap: 4px 16px; }
  .affiliation { margin-top: 20px; }
  .affiliation a { font-size: 13px; gap: 8px; }
  .affiliation img { width: 32px; }
  .affiliation-break { display: inline; }
  .paper-links { margin-top: 17px; gap: 8px; }
  .pill { padding: 7px 17px; min-height: 40px; font-size: 14px; gap: 8px; }
  .tldr { margin-top: 24px; font-size: 15.5px; }
  .abstract, .motivation, .method, .worlds, .results, .examples, .citation { margin-top: 52px; }
  .cf-stage { grid-template-columns: 1fr; gap: 14px; }
  .cf-run figcaption { padding-top: 9px; font-size: 13px; }
  .task-card { margin-top: 20px; padding: 18px 16px 14px; }
  .task-hint { display: none; }
  .task-question { font-size: 16px; }
  .task-option { grid-template-columns: 24px minmax(0, 1fr); gap: 4px 12px; font-size: 14px; }
  .opt-result { grid-column: 2; }
  .opt-result:empty { display: none; }
  .video-grid, .results-grid { grid-template-columns: 1fr; max-width: 500px; margin-inline: auto; gap: 24px; }
  .results-grid { gap: 14px; }
  .result-panel { padding: 20px 22px 15px; }
  .result-panel h3 { min-height: 0; font-size: 17px; }
  .result-panel img { max-width: 400px; margin-inline: auto; }
  .result-gain { font-size: 26px; }
  .section-intro { margin-bottom: 19px; }
  h2 { font-size: 25px; }
  .section-intro p { font-size: 13px; }
  .abstract > p { font-size: 15px; line-height: 1.85; }
  .failure-grid, .audit-grid, .steps, .ablation-grid { grid-template-columns: 1fr; }
  .failure p, .steps p { font-size: 14px; }
  .audit-grid { gap: 10px; }
  .method figure { margin-top: 20px; }
  .subsection { margin-top: 40px; }
  .dp { --task: 128px; --n: 28px; }
  .dp-group-name { width: auto; padding: 0; text-align: left; }
  .dp-task { padding-right: 10px; font-size: 11.5px; }
  .dp-n { font-size: 11px; }
  .dp-legend { gap: 4px 14px; font-size: 11px; }
  .bar { grid-template-columns: 70px minmax(0, 1fr) 40px; }
  .example { padding: 22px 0; }
  .example-q { font-size: 15px; }
  .scene-note { font-size: 10px; }
  table { font-size: 12px; }
  th, td { padding: 10px 8px; }
  thead th { font-size: 10px; }
  .results-note { font-size: 11px; }
  pre { padding: 18px; font-size: 11px; }
  footer { flex-direction: column; gap: 4px; margin-top: 30px; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}