/* EmbodiedSWE — one continuous night-sky palette from introduction to research. */

:root {
  color-scheme:dark;
  --bg:#060E12; --panel:#0C181DEB; --panel2:#14242A;
  --ink:#F3F1E9; --mut:#B5C5C4; --faint:#8EA6A8; --line:#26393E;
  --acc:#9ED9D6; --acc-ink:#B2E3DE; --acc-bg:#153337; --on-acc:#07191B;
  --solve:#9ED9D6; --solve-bg:#153337;
  --teach:#D1B790; --teach-bg:#30291F;
  --learn:#A4BED5; --learn-bg:#1D2A39;
  --good:#A0C9AB; --warn:#D6C18E; --warn-bg:#302B1C;
  --code-bg:#0C191F;
  --shadow:none;
  --shadow-lg:0 14px 40px #00000026;
  --sans:system-ui,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Code",Consolas,monospace;
  --rad:14px;
  --nav-h:56px;
}
:root[data-theme="light"] {
  color-scheme:light;
  --bg:#F0F5F3; --panel:#FFFFFFED; --panel2:#E5EEEB;
  --ink:#172B30; --mut:#34474B; --faint:#465A5E; --line:#CADBD7;
  --acc:#286D6A; --acc-ink:#245F5D; --acc-bg:#DEEEEA; --on-acc:#FFFFFF;
  --solve:#286D6A; --solve-bg:#DEEEEA;
  --teach:#7F5A36; --teach-bg:#F2E9DB;
  --learn:#46627F; --learn-bg:#E1EAF3;
  --good:#3D724B; --warn:#6E5826; --warn-bg:#F1EAD8;
  --code-bg:#E7EFEC;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{margin:0;padding-top:var(--nav-h);isolation:isolate;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16.5px;line-height:1.68;-webkit-font-smoothing:antialiased}
img,video{max-width:100%;display:block}
a{color:var(--acc-ink);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{text-decoration-color:var(--acc)}
code,.mono{font-family:var(--mono)}
code{font-size:.85em;background:var(--code-bg);padding:.14em .42em;border-radius:5px}
h1,h2,h3,h4{text-wrap:balance;line-height:1.22;margin:0;letter-spacing:-.02em}
:focus-visible{outline:2px solid var(--acc);outline-offset:3px;border-radius:6px}
.wrap{max-width:1160px;margin:0 auto;padding:0 32px}
.narrow{max-width:800px;margin:0 auto}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.17em;text-transform:uppercase;
  color:var(--acc-ink);margin:0 0 14px}

/* ---------------- nav ----------------
   Fixed, opaque top bar in the page theme: brand left, Paper / arXiv / Blog / Code dead-centre, Task gallery as a
   filled pill on the right. The page starts below it (body padding-top) and the bulb / title stages pin beneath it,
   so nothing ever slides under the bar. */
nav.top{position:fixed;top:0;left:0;right:0;z-index:40;color:var(--ink);background:var(--bg);
  border-bottom:1px solid var(--line)}
nav.top .row{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;height:var(--nav-h);max-width:1440px}
nav.top .brand{justify-self:start;font-weight:700;font-size:16px;letter-spacing:.01em;text-decoration:none;color:var(--ink);
  white-space:nowrap}
nav.top .brand b{color:var(--acc)}
nav.top .nav-links{display:flex;align-items:center;justify-content:center;gap:6px;min-width:0;
  overflow-x:auto;scrollbar-width:none}
nav.top .nav-links::-webkit-scrollbar{display:none}
nav.top .nav-tools{justify-self:end;display:flex;align-items:center;gap:10px}
nav.top .lnk{position:relative;flex:none;display:inline-flex;align-items:center;gap:7px;
  text-decoration:none;color:var(--ink);font-size:14.5px;font-weight:550;letter-spacing:.01em;
  padding:8px 14px;border-radius:999px;white-space:nowrap;transition:color .25s ease,background .25s ease}
nav.top .lnk::after{content:"";position:absolute;left:50%;bottom:0;width:0;height:2px;border-radius:1px;
  background:var(--acc);transform:translateX(-50%);transition:width .3s ease}
nav.top a.lnk:hover{background:var(--panel2)}
nav.top a.lnk:hover::after,nav.top a.lnk.on::after{width:calc(100% - 28px)}
nav.top .lnk.soon{cursor:default;color:var(--mut)}
nav.top .lnk.soon small{font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  padding:2px 6px;border-radius:999px;border:1px solid var(--line);color:var(--faint);line-height:1.3}
/* the one live destination: a filled accent pill */
nav.top .gallery-cta{display:inline-flex;align-items:center;gap:8px;text-decoration:none;white-space:nowrap;
  font-size:14px;font-weight:650;letter-spacing:.01em;padding:9px 18px;border-radius:999px;
  background:var(--acc);color:var(--on-acc);border:1px solid transparent;
  box-shadow:0 4px 16px color-mix(in srgb,var(--acc) 25%,transparent);
  transition:transform .2s ease,box-shadow .25s ease,filter .25s ease}
nav.top .gallery-cta .ic{font-size:11px}
nav.top .gallery-cta .cta-short{display:none}
nav.top .gallery-cta:hover{filter:brightness(1.08);transform:translateY(-1px);
  box-shadow:0 8px 24px color-mix(in srgb,var(--acc) 40%,transparent)}
.spacer{flex:1}
button.theme{flex:none;border:1px solid var(--line);background:var(--panel);color:var(--ink);
  width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:15px;line-height:1;
  display:grid;place-items:center;transition:border-color .25s ease,background .25s ease}
button.theme:hover{border-color:var(--acc);background:var(--panel2)}

/* ---------------- hero ---------------- */
.authors{margin:26px auto 0;max-width:60ch;font-size:15px;color:var(--mut)}
.authors .pending{display:inline-block;font-family:var(--mono);font-size:12.5px;
  padding:7px 12px;color:var(--faint)}
.badges{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:26px 0 0}
.badge{display:inline-flex;align-items:center;gap:7px;text-decoration:none;font-size:14px;
  font-weight:450;padding:10px 18px;border-radius:999px;border:1px solid var(--line);
  background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}
.badge:hover{border-color:var(--acc);color:var(--acc-ink)}
.badge.primary{background:var(--acc);border-color:var(--acc);color:var(--on-acc)}
.badge.primary:hover{filter:brightness(1.08);color:var(--on-acc)}
.badge .ic{font-size:15px;line-height:1}
.badge.soon{opacity:.6;cursor:default;box-shadow:none}
.badge.soon:hover{filter:none;border-color:var(--line);color:inherit}
.badge.primary.soon{background:var(--panel);border-color:var(--line);color:var(--mut)}

/* ---------------- sections ---------------- */
section{padding:88px 0 12px;scroll-margin-top:36px}
#tasks{padding-top:8px}#tasks h3.sub:first-child{margin-top:16px}   /* continues the benchmark section: the gallery sits right under its intro */

/* ---------- side menu: a fixed card listing the sections as a timeline, placed 48px outside the right edge of the
   content container (not the viewport edge) and centred vertically. Shown from the Overview down (site.js). ---------- */
.side-menu{display:none}
@media (min-width:1560px){
  /* .wrap is max-width 1160px incl. 32px side padding, centred: its content edge is at 50% + 548px */
  .side-menu{display:block;position:fixed;left:min(calc(50% + 548px + 48px),calc(100% - 216px));top:50%;   /* min(): the longer Acknowledgements label would run off the viewport at the breakpoint */transform:translateY(-50%) translateX(8px);z-index:30;
    opacity:0;pointer-events:none;transition:opacity .35s,transform .35s;
    padding:14px 14px 10px;border:1px solid color-mix(in srgb,var(--acc) 38%,var(--line));border-radius:12px;
    background:radial-gradient(120% 90% at 0 0,color-mix(in srgb,var(--acc) 12%,transparent),transparent 60%),color-mix(in srgb,var(--panel) 94%,transparent);
    box-shadow:0 0 0 1px color-mix(in srgb,var(--acc) 14%,transparent),0 0 36px color-mix(in srgb,var(--acc) 16%,transparent),0 14px 40px #0007;
    backdrop-filter:blur(8px)}
  .side-menu.show{opacity:1;pointer-events:auto;transform:translateY(-50%)}
  .side-menu a{text-decoration:none;color:var(--faint);transition:color .2s}
  .side-menu a:hover,.side-menu a.on{color:var(--ink)}
  .side-menu-head{display:block;font:13px var(--sans);color:var(--mut);padding:0 0 10px 22px}
  .side-menu ul{list-style:none;margin:0;padding:0;position:relative}
  .side-menu ul::before{content:"";position:absolute;left:3px;top:14px;bottom:14px;width:1px;background:var(--line)}     /* timeline track */
  .side-menu ul::after{content:"";position:absolute;left:3px;top:14px;height:var(--fill,0px);width:1px;background:var(--acc);
    box-shadow:0 0 8px var(--acc);transition:height .45s cubic-bezier(.4,0,.2,1)}                                             /* lit segment */
  .side-menu li a{position:relative;display:grid;grid-template-columns:2ch auto;column-gap:8px;align-items:baseline;padding:7px 2px 7px 22px}
  .side-menu li a::before{content:"";position:absolute;left:0;top:50%;width:7px;height:7px;border-radius:50%;background:var(--line);
    transform:translateY(-50%);transition:background .2s,box-shadow .2s}
  .side-menu li a b{font:11.5px var(--mono);color:var(--acc);opacity:.7}
  .side-menu li a span{font:13.5px var(--sans);white-space:nowrap}
  .side-menu li a.on span{font-weight:600}
  .side-menu li a.on b{opacity:1}
  .side-menu li a.past::before{background:color-mix(in srgb,var(--acc) 60%,var(--line))}
  .side-menu li a.on::before{background:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 22%,transparent),0 0 10px var(--acc);
    animation:side-menu-pulse 2.6s ease-in-out infinite}
  .side-menu li a.on span{color:var(--acc-ink)}
  .side-menu li a.on b{text-shadow:0 0 8px color-mix(in srgb,var(--acc) 60%,transparent)}
  @keyframes side-menu-pulse{0%,100%{box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 22%,transparent),0 0 10px var(--acc)}
    50%{box-shadow:0 0 0 5px color-mix(in srgb,var(--acc) 14%,transparent),0 0 18px var(--acc)}}
  @media (prefers-reduced-motion:reduce){.side-menu li a.on::before{animation:none}.side-menu ul::after{transition:none}}
  .side-menu-cite{display:flex;align-items:center;gap:9px;margin-top:8px;padding:12px 4px 4px 0;border-top:1px solid var(--line);font:13.5px var(--sans)}
  .side-menu-cite svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linejoin:round;flex:none;margin-left:-3px}
}
#overview{padding-top:36px}                                      /* follows the title page closely */
#overview .sec-head h2{font-size:clamp(38px,5vw,58px)}                    /* the opening section heading, a step larger */
#overview .sec-head p.lede,#acknowledgements .sec-head p.lede{max-width:none}   /* full column, not the 68ch measure */
#overview .sec-head p.lede b{color:var(--ink);font-weight:550}
.sec-head{margin-bottom:34px}
.sec-head h2{font-size:clamp(29px,3.8vw,44px);font-weight:500;letter-spacing:-.04em}
.sec-head h2 .sec-no{color:var(--acc);font-variant-numeric:tabular-nums;margin-right:.15em}   /* section number */
.sec-head p.lede, p.lede{color:var(--mut);margin:22px 0 0;font-size:17px;max-width:68ch;line-height:1.85}   /* also the lede under an h3.sub */
h3.sub{font-size:22px;font-weight:500;margin:46px 0 18px;letter-spacing:-.025em}
p{margin:0 0 16px}
hr.rule{border:0;border-top:1px solid var(--line);margin:76px auto 0;max-width:1096px}

/* figure */
figure{margin:0}
.fig{background:var(--panel);border:1px solid var(--line);border-radius:var(--rad);
  padding:14px;box-shadow:var(--shadow)}
.fig img,.fig video{border-radius:7px;width:100%;height:auto;display:block}
.task-film{margin:0 0 34px}
.fig.plain{background:transparent;border:0;box-shadow:none;padding:0}
figcaption{font-size:14px;color:var(--mut);margin-top:13px;line-height:1.6}
figcaption b{color:var(--ink);font-weight:650}

/* stat strip */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:12px;margin:4px 0 30px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--rad);padding:24px 20px}
.stat .n{font-size:38px;font-weight:450;letter-spacing:-.045em;color:var(--acc-ink);
  font-variant-numeric:tabular-nums}
.stat .l{font-size:13.5px;color:var(--mut);margin-top:2px;line-height:1.4}

/* three-lane loop */

/* Four contributions, drawn as a connected and inspectable research loop. */
.pipeline{--stage-color:var(--solve);border:1px solid var(--line);border-radius:18px;
  background:color-mix(in srgb,var(--panel) 94%,transparent);padding:28px;position:relative}
.pipeline [hidden]{display:none}
.pipeline-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:28px}
.pipeline-heading .eyebrow{font-size:10.5px;margin-bottom:10px;color:var(--faint)}
.pipeline-heading h3{font-size:29px;font-weight:450;letter-spacing:-.04em}
.pipeline-map{position:relative;padding-bottom:4px}
.pipeline-stages{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;position:relative}
.pipeline-connections{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.pipeline-paths path{fill:none;stroke:var(--flow-color);stroke-width:1.5;opacity:.55}
.pipeline-paths path.pipeline-path-active{opacity:1}
.pipeline-paths .pipeline-return{stroke-dasharray:4 6;opacity:.65}
.pipeline-particle{fill:var(--flow-color);filter:drop-shadow(0 0 4px var(--flow-color));pointer-events:none}
.pipeline-card{--card-color:var(--solve);display:flex;flex-direction:column;position:relative;text-align:left;
  font-family:var(--sans);background:var(--bg);border:1px solid var(--line);border-radius:12px;
  padding:18px 14px;color:var(--ink);min-width:0;cursor:pointer;transition:border-color .3s,box-shadow .3s,transform .3s}
.pipeline-card:nth-child(2){--card-color:var(--learn)}
.pipeline-card:nth-child(3){--card-color:var(--teach)}
.pipeline-card:nth-child(4){--card-color:var(--solve)}
.pipeline-card:disabled{cursor:default;opacity:1}
.pipeline-card:hover{border-color:var(--card-color)}
/* selected card: lifted, ringed in its stage color, deep tinted shadow and a colored wash fading from the top */
.pipeline-card[aria-pressed="true"]{border-color:var(--card-color);transform:translateY(-4px);
  box-shadow:0 0 0 1.5px var(--card-color),0 18px 44px color-mix(in srgb,var(--card-color) 24%,transparent);
  background:linear-gradient(180deg,color-mix(in srgb,var(--card-color) 12%,var(--bg)),var(--bg) 55%)}
.pipeline-card-top{display:flex;justify-content:space-between;gap:10px;font:10.5px var(--mono);
  text-transform:uppercase;letter-spacing:.1em;color:var(--card-color);margin-bottom:16px}
.pipeline-card-title{font-size:20px;line-height:1.25;font-weight:500;letter-spacing:-.035em;min-height:50px}  /* room for a 2-line title */
.pipeline-visual{height:170px;width:100%;display:flex;align-items:center;justify-content:center;margin:6px 0 18px;
  position:relative;color:var(--card-color)}
.pipeline-visual svg{display:block;width:100%;height:auto;max-height:100%;aspect-ratio:24/17;overflow:visible}
.pipeline-benchmark{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:repeat(3,minmax(0,1fr));align-items:stretch;gap:5px;overflow:hidden;
  /* size the photo grid to the footprint the sibling SVG drawings actually occupy: ~3px in from the sides and
     about 0.61x the card width tall, centred in the 170px visual box (measured against cards 02-04) */
  padding-inline:3px;padding-block:max(0px,calc((170px - 100% * 0.61) / 2))}
.pipeline-benchmark>span:not(.pipeline-scan){position:relative;min-width:0;min-height:0;overflow:hidden;border-radius:4px}
.pipeline-benchmark>span>span{position:absolute;inset:auto 0 0;padding:5px 3px 2px;background:linear-gradient(transparent,#000e);color:#fff;font:9.5px/1.3 var(--sans)}
.pipeline-benchmark img{width:100%;height:100%;min-height:0;object-fit:cover;border:1px solid var(--line);border-radius:4px;opacity:.8}
.pipeline-scan{position:absolute;left:0;right:0;top:0;height:1px;background:var(--card-color);opacity:0;
  box-shadow:0 0 10px var(--card-color)}
.pipeline-shape{fill:var(--panel2);stroke:var(--line);stroke-width:1.5}
.pipeline-svg-label{fill:var(--mut);font:10px var(--mono)}
.pipeline-dimension-labels{font-size:8px;letter-spacing:-.3px}
.pipeline-agent{fill:none;stroke:var(--card-color);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.pipeline-brain{fill:none;stroke:var(--card-color);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;
  animation:pipeline-brain 3s ease-in-out infinite}
.pipeline-card:nth-child(4) .pipeline-brain{animation-delay:-1.5s}
.pipeline-brand-mark{fill:var(--card-color)}
.pipeline-brand-divider{fill:none;stroke:var(--card-color);stroke-width:.7;opacity:.3}
.pipeline-code-lines path{stroke:var(--card-color);stroke-width:2.5;stroke-linecap:round}
.pipeline-flow,.pipeline-arm{fill:none;stroke:var(--card-color);stroke-width:2;stroke-linecap:round}
.pipeline-arm{stroke-width:5}
.pipeline-joint{fill:var(--bg);stroke:var(--card-color);stroke-width:2}
.pipeline-feedback{fill:none;stroke:var(--card-color);stroke-width:1.5;stroke-dasharray:5 4}
.pipeline-branches{fill:none;stroke:var(--card-color);stroke-width:1.5;opacity:.55}
.pipeline-datasets rect{fill:var(--panel2);stroke:var(--card-color);stroke-width:1.5}
.pipeline-policy{fill:var(--teach-bg);stroke:var(--card-color);stroke-width:1.5}
.pipeline-rewards rect{fill:var(--card-color);opacity:.8;transform-box:fill-box;transform-origin:bottom}
.pipeline-card-copy{font-size:13.5px;line-height:1.7;color:var(--mut);min-height:84px}
.pipeline-card-foot{display:flex;justify-content:space-between;gap:8px;font:10.5px/1.6 var(--mono);color:var(--card-color);
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line)}
.pipeline-card-foot>span{font-size:13px}
.pipeline-return-label{position:relative;width:fit-content;padding:0 12px;margin:46px auto 10px;text-align:center;
  font:10.5px/1.6 var(--mono);letter-spacing:.02em;color:var(--faint);background:var(--bg);border-radius:10px}
.pipeline-detail{display:grid;grid-template-columns:minmax(200px,.8fr) minmax(0,1.6fr);gap:35px;
  padding:27px 0 20px;margin-top:15px;border-top:1px solid var(--line);min-height:200px}
.pipeline-detail-kicker{font:11px var(--mono);color:var(--stage-color);text-transform:uppercase;letter-spacing:.1em}
.pipeline-detail h4{font-size:24px;font-weight:450;letter-spacing:-.035em;margin:10px 0 15px}
.pipeline-detail-link{font-size:13.5px;color:var(--stage-color)}
.pipeline-detail-description{font-size:15px;line-height:1.85;color:var(--mut);margin:0}
.pipeline-next{font:13px var(--sans);color:var(--mut);background:transparent;border:1px solid var(--line);
  padding:10px 14px;border-radius:24px;cursor:pointer;flex:none;min-height:40px}
.pipeline-next:hover{color:var(--ink);border-color:var(--acc)}
.pipeline-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.pipeline-scan{animation:pipeline-scan 3.4s ease-in-out infinite}
.pipeline-code-lines{animation:pipeline-code 2.8s ease-in-out infinite}
.pipeline-feedback{animation:pipeline-flow 2s linear infinite}
.pipeline-datasets rect{animation:pipeline-glow 3s ease-in-out infinite}
.pipeline-datasets rect:nth-child(2){animation-delay:-2.4s}
.pipeline-datasets rect:nth-child(3){animation-delay:-1.8s}
.pipeline-datasets rect:nth-child(4){animation-delay:-1.2s}
.pipeline-datasets rect:nth-child(5){animation-delay:-.6s}
.pipeline-datasets rect:nth-child(6){animation-delay:-.3s}
.pipeline:not(.pipeline-running) .pipeline-card *{animation-play-state:paused}
@keyframes pipeline-scan{0%,100%{transform:translateY(8px);opacity:0}15%,85%{opacity:.75}90%{transform:translateY(160px)}}
@keyframes pipeline-code{0%,100%{opacity:1}45%{opacity:.25}}
@keyframes pipeline-brain{0%,100%{opacity:.8;filter:drop-shadow(0 0 0 transparent)}50%{opacity:1;filter:drop-shadow(0 0 2px var(--card-color))}}
@keyframes pipeline-flow{to{stroke-dashoffset:-36}}
@keyframes pipeline-glow{0%,100%{fill:var(--panel2)}50%{fill:var(--teach-bg);stroke-width:3}}
@keyframes pipeline-reward{0%,100%{transform:scaleY(1)}40%{transform:scaleY(.35)}}
@media (max-width:1000px) and (min-width:901px){.pipeline{padding:20px}.pipeline-stages{gap:16px}.pipeline-card{padding:15px 10px}.pipeline-card-title{font-size:18px}}
@media (max-width:900px){
  .pipeline-stages{grid-template-columns:1fr;gap:24px;margin-left:20px}
  .pipeline-card{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:0 24px;padding:20px}
  .pipeline-card-top,.pipeline-card-title,.pipeline-card-copy,.pipeline-card-foot{grid-column:1}
  .pipeline-visual{grid-column:2;grid-row:1/5;align-self:center;margin:0}
  .pipeline-card-title{min-height:0}.pipeline-card-copy{min-height:0;margin-top:14px}
  .pipeline-detail{grid-template-columns:1fr;gap:20px;min-height:0}.pipeline-return-label{margin-top:24px}
}
@media (max-width:520px){
  .pipeline{padding:18px 14px}.pipeline-heading h3{font-size:23px}.pipeline-heading .eyebrow{font-size:9.5px}
  .pipeline-card{grid-template-columns:minmax(0,1fr);gap:0;padding:16px 12px}
  .pipeline-card-title{font-size:18px;overflow-wrap:anywhere}.pipeline-card-top{font-size:9.5px}
  .pipeline-visual{grid-column:1;grid-row:auto;height:auto;aspect-ratio:24/17;max-width:300px;margin:18px auto}
  .pipeline-benchmark{padding-block:4.9%}.pipeline-benchmark>span>span{font-size:10px}  /* visual box is 24:17 here, not 170px */
  .pipeline-card-copy{font-size:12.5px;margin-top:0;margin-bottom:16px}
  .pipeline-card-foot{grid-column:1/-1;font-size:10px}.pipeline-detail h4{font-size:22px}
  .pipeline-return-label{font-size:9.5px}
}
@media (prefers-reduced-motion:reduce){
  .pipeline-card{transition:none}.pipeline .pipeline-card *{animation:none!important}
}

/* task gallery */
.filters{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 20px}
.filters button{border:1px solid var(--line);background:var(--panel);color:var(--mut);
  font-size:13px;font-weight:600;padding:6px 13px;border-radius:999px;cursor:pointer;
  font-family:inherit}
.filters button:hover{color:var(--ink);border-color:var(--acc)}
.filters button[aria-pressed="true"]{background:var(--acc-bg);color:var(--acc-ink);
  border-color:var(--acc);font-weight:680}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--rad);
  overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .2s,transform .2s}
@media (prefers-reduced-motion: reduce){.card{transition:none}}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card[hidden]{display:none}
.shot{position:relative;aspect-ratio:16/9;background:var(--panel2);cursor:pointer}
.shot video{width:100%;height:100%;object-fit:cover;background:var(--panel2)}
.shot img.thumb{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:var(--panel2);
  transition:opacity .25s ease;pointer-events:none}   /* shown until the clip has frames (.live) */
.shot.live img.thumb{opacity:0}
.shot .play{position:absolute;inset:auto 9px 9px auto;background:rgba(8,20,24,.72);
  color:#fff;font-size:12px;font-weight:650;padding:4px 9px;border-radius:999px;
  font-family:var(--mono);letter-spacing:.04em;pointer-events:none;
  transition:opacity .18s}
.shot.playing .play{opacity:0}
/* buffering ring: shown while a hovered clip is still fetching its first frames, or stalls mid-clip; the
   short delay keeps it from flashing on clips that start instantly */
.shot .spin{position:absolute;left:50%;top:50%;width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;
  border:2.5px solid rgba(255,255,255,.28);border-top-color:#fff;opacity:0;pointer-events:none;
  background:rgba(8,20,24,.45);box-shadow:0 0 0 7px rgba(8,20,24,.45);   /* legible over light posters too */
  transition:opacity .2s .3s}
.shot.playing:not(.live) .spin,.shot.buffering .spin{opacity:1;animation:spin .8s linear infinite}
@media (prefers-reduced-motion: reduce){.shot .spin{animation:none!important;border-top-color:rgba(255,255,255,.28);border-right-color:#fff}}
.card .meta{padding:20px}
.card .meta h4{font-size:18px;font-weight:500;margin:0 0 10px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.card .meta h4 .tag{flex:none}   /* difficulty sits on the title line, right-aligned */
.card .meta .tags{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 8px}
.tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;
  padding:3px 7px;border-radius:5px;background:var(--panel2);color:var(--mut);font-weight:650}
.tag.d-easy{background:var(--acc-bg);color:var(--acc-ink)}
.tag.d-medium{background:var(--warn-bg);color:var(--warn)}
.tag.d-hard{background:var(--teach-bg);color:var(--teach)}
.card .meta p{font-size:14.5px;color:var(--mut);margin:0;line-height:1.55}

/* table */
.tbl-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--rad);
  background:var(--panel);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;font-size:14.4px}
th,td{text-align:left;padding:15px 18px;border-bottom:1px solid var(--line);white-space:nowrap}
thead th{font-size:12.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--faint);
  font-weight:700;background:var(--panel2);position:sticky;top:0}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover td{background:var(--panel2)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;font-family:var(--mono);
  font-size:14px}
td.wrap-ok{white-space:normal;min-width:270px;color:var(--mut)}
.best{color:var(--acc-ink);font-weight:730}
.mark{color:var(--good);font-weight:700}

details.catalog{margin-top:36px;border:1px solid var(--line);border-radius:var(--rad);
  background:var(--panel);box-shadow:var(--shadow);overflow:hidden}
details.catalog>summary{cursor:pointer;padding:14px 18px;font-weight:650;font-size:15px;
  list-style:none;display:flex;align-items:center;gap:9px}
details.catalog>summary::-webkit-details-marker{display:none}
details.catalog>summary::before{content:"▸";color:var(--acc);font-size:12px;
  transition:transform .18s}
details.catalog[open]>summary::before{transform:rotate(90deg)}
details.catalog>summary:hover{background:var(--panel2)}
details.catalog .tbl-scroll{border:0;border-top:1px solid var(--line);border-radius:0;
  box-shadow:none;max-height:520px;overflow-y:auto}

/* cards / notes */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:860px){.grid2,.grid3{grid-template-columns:1fr}}
.box{background:var(--panel);border:1px solid var(--line);border-radius:var(--rad);
  padding:26px;box-shadow:var(--shadow)}
.box h3,.box h4{font-size:18px;font-weight:500;margin:0 0 14px;display:flex;gap:9px;align-items:baseline}
.box h3 .idx,.box h4 .idx{font-family:var(--mono);font-size:12px;color:var(--faint);font-weight:650;
  flex:none}
.box p{font-size:15px;color:var(--mut);margin:0}
.box p+p{margin-top:9px}
.note{border-left:3px solid var(--acc);background:var(--acc-bg);border-radius:0 9px 9px 0;
  padding:14px 18px;font-size:14.6px;color:var(--ink)}
.note b{font-weight:700}


/* diversification player, notes and yield chart */

/* Task timeline: full-resolution viewer with a compact, selectable filmstrip. */
.task-timeline{padding:28px;--task-progress:0}
.task-timeline [hidden]{display:none}
.task-timeline-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}
.task-timeline-heading .eyebrow{font-size:10px;margin-bottom:10px}
.task-timeline-heading h3{font-size:30px;font-weight:450;letter-spacing:-.04em}
.task-timeline-count{font:10px var(--mono);color:var(--faint);white-space:nowrap}
.task-timeline-layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:28px}
.task-timeline-list{display:flex;flex-direction:column;gap:4px;border-right:1px solid var(--line);padding-right:18px}
.task-timeline-list button{display:flex;align-items:center;gap:12px;text-align:left;width:100%;
  padding:10px;border:1px solid transparent;border-radius:8px;background:transparent;
  color:var(--mut);cursor:pointer;font:13px var(--sans);line-height:1.3}
.task-list-number{font:9px var(--mono);color:var(--faint)}
.task-timeline-list small{display:block;font:9px var(--mono);color:var(--faint);margin-top:5px}
.task-list-arrow{margin-left:auto;opacity:0}
.task-timeline-list button[aria-pressed="true"]{background:var(--acc-bg);color:var(--acc-ink);border-color:var(--line)}
.task-timeline-list button[aria-pressed="true"] .task-list-arrow{opacity:1}
.task-timeline-list button:hover{color:var(--ink);background:var(--panel2)}
.task-timeline-picker{display:none}
.task-timeline-title{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:8px}
.task-timeline-title h4{font-size:24px;font-weight:450;letter-spacing:-.035em}
.task-timeline-robot{font-size:9px;flex:none}
.task-timeline-objective{font-size:14px;color:var(--mut);line-height:1.7;min-height:48px;margin-bottom:16px}
.task-timeline-screen{position:relative;aspect-ratio:16/9;overflow:hidden;border:1px solid var(--line);
  border-radius:10px;background:var(--panel2)}
.task-timeline-screen .task-timeline-image{width:100%;height:100%;object-fit:contain;border-radius:0}
.task-timeline-screen[aria-busy="true"] .task-timeline-image{opacity:.2}
.task-timeline-screen[aria-busy="true"] .task-timeline-stamp{visibility:hidden}
.task-timeline-loading{display:none;position:absolute;inset:0;padding:24px;align-items:center;justify-content:center;
  text-align:center;color:var(--mut);font:13px/1.7 var(--sans)}
.task-timeline-screen[aria-busy="true"] .task-timeline-loading,.task-frame-error .task-timeline-loading{display:flex}
.task-frame-error .task-timeline-image,.task-frame-error .task-timeline-stamp{visibility:hidden}
.task-timeline-stamp{position:absolute;right:12px;bottom:12px;font:10px var(--mono);color:#f3f1e9;
  border:1px solid #a5c6bf40;background:#060e12d9;padding:7px 10px;border-radius:5px}
.task-timeline-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:79px}
.task-timeline-position{font:9px var(--mono);letter-spacing:.14em;color:var(--acc)}
.task-timeline-caption{font-size:14px;color:var(--ink);margin:5px 0 0;line-height:1.5}
.task-timeline-play{flex:none;background:transparent;border:1px solid var(--line);border-radius:24px;
  color:var(--mut);font:12px var(--sans);padding:10px 15px;min-height:40px;cursor:pointer}
.task-timeline-play:hover{color:var(--acc);border-color:var(--acc)}
.task-timeline-frames{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.task-timeline-frames button{min-width:0;cursor:pointer;padding:0;background:transparent;border:0;text-align:left;color:var(--mut)}
.task-thumb-image{position:relative;display:block;border:2px solid transparent;border-radius:7px;padding:2px}
.task-thumb-image img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:3px;opacity:.55}
.task-timeline-frames button[aria-pressed="true"] .task-thumb-image{border-color:var(--acc)}
.task-timeline-frames button[aria-pressed="true"] img,.task-timeline-frames button:hover img{opacity:1}
.task-timeline-frames button[aria-pressed="true"] .task-thumb-image::after{content:"";position:absolute;bottom:4px;left:4px;right:4px;
  height:2px;background:var(--acc);transform:scaleX(var(--task-progress));transform-origin:left}
.task-thumb-label{display:flex;justify-content:space-between;gap:4px;font:9px var(--mono);padding:8px 4px;color:var(--faint)}
.task-thumb-label>span{color:var(--mut)}
.task-timeline-frames button[aria-pressed="true"] .task-thumb-label>span{color:var(--acc)}
.task-timeline-footer{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-top:14px}
.task-timeline-note{font-size:11px;line-height:1.6;color:var(--faint);margin:0}
.task-timeline-full{flex:none;font-size:11px;padding:5px 0}
.task-timeline-full:not([href]){visibility:hidden}
.task-timeline>figcaption{border-top:1px solid var(--line);padding-top:18px;margin-top:24px;font-size:12px}
.task-timeline-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip-path:inset(50%);white-space:nowrap}
@media (max-width:860px){
  .task-timeline{padding:22px}.task-timeline-layout{grid-template-columns:1fr;gap:22px}
  .task-timeline-list{display:none}.task-timeline-picker{display:flex;align-items:center;gap:16px;
    font:10px var(--mono);color:var(--faint)}
  .task-timeline-picker select{flex:1;min-width:0;padding:12px;border:1px solid var(--line);border-radius:7px;
    background:var(--panel2);color:var(--ink);font:14px var(--sans)}
  .task-timeline-objective{min-height:0}.task-timeline-heading{margin-bottom:24px}
}
@media (max-width:520px){
  .task-timeline{padding:16px 12px}.task-timeline-heading{align-items:flex-start;gap:12px}
  .task-timeline-heading h3{font-size:24px}.task-timeline-count{font-size:8px;max-width:65px;white-space:normal;text-align:right;line-height:1.8}
  .task-timeline-title{flex-wrap:wrap;gap:8px}.task-timeline-title h4{font-size:22px}
  .task-timeline-objective{font-size:13px}.task-timeline-picker{gap:12px;font-size:9px}
  .task-timeline-frames{gap:3px}.task-thumb-image{padding:1px;border-radius:5px}
  .task-thumb-label{font-size:8px;padding:6px 2px;flex-direction:column}
  .task-timeline-caption{font-size:13px}.task-timeline-stamp{font-size:8px;bottom:7px;right:7px}
  .task-timeline-footer{flex-wrap:wrap;gap:6px}.task-timeline-play{padding:9px 12px}
}

/* Five-level walkthrough: real render crops, animated within the page. */
.diversification{--level-color:var(--solve);padding:24px;min-width:0;margin-top:26px}
/* below the player: the two notes on the left, the yield chart on the right */
.gen-notes-text{max-width:70ch;color:var(--mut);margin-top:26px}
.gen-notes-text p+p{margin-top:14px}
.gen-charts{margin-top:22px}
.diversification [hidden]{display:none}
.diversification-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}
.diversification-heading .eyebrow{font-size:10.5px;margin-bottom:8px;color:var(--faint)}
.diversification-heading h3{font-size:22px;font-weight:500;letter-spacing:-.035em}
.diversification button{font:13px var(--sans);color:var(--mut);cursor:pointer}
/* level tabs: each carries its own level colour; the active one fills with its tint */
.diversification-levels{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:26px 0}
.diversification-levels button{display:flex;align-items:center;justify-content:center;gap:9px;
  background:transparent;border:1px solid var(--line);border-radius:10px;padding:10px 8px;
  font:600 13.5px/1.3 var(--sans);color:var(--mut);letter-spacing:-.01em;
  transition:background .25s,border-color .25s,color .25s,transform .25s}
.diversification-levels button span{display:inline-flex;align-items:center;justify-content:center;
  width:24px;height:24px;border-radius:7px;flex:none;font:700 11px var(--mono);
  background:var(--tab-bg);color:var(--tab-color);transition:background .25s,color .25s}
.diversification-levels button:hover{border-color:var(--tab-color);color:var(--ink)}
.diversification-levels button[aria-pressed="true"]{background:var(--tab-bg);border-color:var(--tab-color);
  color:var(--ink);box-shadow:0 0 0 3px color-mix(in srgb,var(--tab-color) 22%,transparent)}
.diversification-levels button[aria-pressed="true"] span{background:var(--tab-color);color:var(--bg)}
.diversification-stage{min-height:365px}
.diversification-summary{margin-bottom:22px;max-width:78ch}
.diversification-number{font:10.5px var(--mono);letter-spacing:.14em;color:var(--level-color)}
.diversification-summary h4{font-size:24px;font-weight:450;letter-spacing:-.03em;margin-top:10px;line-height:1.25}
.diversification-summary h4 mark{background:none;color:var(--level-color);font-weight:650;
  box-shadow:inset 0 -.38em 0 color-mix(in srgb,var(--level-color) 22%,transparent)}
.diversification-frames{display:grid;grid-template-columns:repeat(var(--tiles,3),minmax(0,1fr));gap:10px}
.diversification-frame{min-width:0;animation:diversification-enter .7s both;animation-delay:var(--frame-delay)}
.diversification-frame>svg,.diversification-frame>video{display:block;width:100%;aspect-ratio:1.5;border-radius:7px;
  overflow:hidden;background:var(--panel2);border:1px solid var(--line)}
.diversification-frame>video{object-fit:cover}
.diversification-frame figcaption{font-size:11.5px;line-height:1.45;margin-top:9px;min-height:30px}
.diversification-caption{font-size:13.5px;line-height:1.6;color:var(--faint);margin:12px 0 0}
.diversification-description b,.diversification-caption b{color:var(--ink);font-weight:600}
.diversification-description{font-size:15px;line-height:1.7;color:var(--mut);margin:12px 0 0}
.diversification-timeline{height:2px;background:var(--line);margin-top:22px;overflow:hidden}
.diversification-timeline span{display:block;height:100%;background:var(--level-color);
  transform:scaleX(0);transform-origin:left}
.diversification-paused .diversification-frame{animation:none}
@keyframes diversification-enter{from{opacity:0;transform:translateY(12px) scale(.97)}to{opacity:1;transform:none}}
@media (max-width:1000px){.diversification-stage{min-height:0}}
@media (max-width:520px){
  .diversification{padding:18px 14px}.diversification-heading h3{font-size:20px}
  .diversification-levels{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}.diversification-levels button{flex-direction:column;gap:5px;padding:8px 2px;font-size:11px}.diversification-levels button span{width:20px;height:20px;font-size:9.5px}
  .diversification-summary h4{font-size:20px}
  .diversification-frames{gap:6px}.diversification-frame figcaption{font-size:10px}
  .diversification-description{font-size:13.5px}
}
@media (prefers-reduced-motion:reduce){.diversification-frame{animation:none}}

/* code */
pre.code{background:var(--code-bg);border:1px solid var(--line);border-radius:var(--rad);
  padding:16px 18px;overflow-x:auto;font-family:var(--mono);font-size:13.5px;line-height:1.62;
  margin:0;color:var(--ink)}
pre.code .c{color:var(--faint)}
pre.code .k{color:var(--acc-ink);font-weight:650}
pre.code .s{color:var(--teach)}
.cap{font-size:14px;color:var(--faint);margin-top:10px}

/* bibtex */
.bib{position:relative}
.bib button{position:absolute;top:11px;right:11px;border:1px solid var(--line);
  background:var(--panel);color:var(--mut);font-size:12.5px;font-weight:600;padding:5px 11px;
  border-radius:7px;cursor:pointer;font-family:inherit}
.bib button:hover{color:var(--acc-ink);border-color:var(--acc)}

footer{margin-top:64px;border-top:1px solid var(--line);padding:30px 0 56px;
  font-size:14px;color:var(--faint)}
footer a{color:var(--mut)}
footer .frow{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:space-between}

/* ---------------- animated result charts ---------------- */
/* Keep the paper's series identities, with enough contrast for the night sky. */
:root{
  --m-fable51:#D6A17E; --m-opus5:#CF796B; --m-opus48:#E4CBA4;
  --m-sol:#83A7CF; --m-terra:#B5CDE3; --m-astra:#7CC4C9;
}
:root[data-theme="light"]{
  --m-fable51:#A05F3F; --m-opus5:#8C2D1C; --m-opus48:#986824;
  --m-sol:#2B4C7E; --m-terra:#476A92; --m-astra:#1F6E78;
}

.chart-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--rad);
  padding:24px 24px 16px;box-shadow:var(--shadow)}
.chart-card h3,.chart-card h4{font-size:18px;font-weight:500;margin:0 0 8px}
.chart-card .sub{font-size:14px;color:var(--faint);margin:0 0 8px}
/* side-by-side cards stretch to one height; the shorter chart centres in the spare room */
.chart-pair .chart-card{display:flex;flex-direction:column}
.chart-pair .chart-card svg{margin:auto 0}
svg.chart{width:100%;height:auto;display:block;overflow:visible}

svg.chart .grid{stroke:var(--line);stroke-width:1}
svg.chart .axis{stroke:var(--faint);stroke-width:1}
svg.chart .tick{fill:var(--faint);font-family:var(--mono);font-size:12px}
svg.chart .axis-title{fill:var(--mut);font-family:var(--sans);font-size:12.5px;font-weight:550}
svg.chart .row-label{fill:var(--ink);font-family:var(--sans);font-size:13px;font-weight:620}
svg.chart .legend-t{fill:var(--mut);font-family:var(--sans);font-size:12.5px;font-weight:550}

.s-fable51{--c:var(--m-fable51)} .s-opus5{--c:var(--m-opus5)}
.s-opus48{--c:var(--m-opus48)}   .s-sol{--c:var(--m-sol)}
.s-terra{--c:var(--m-terra)}   .s-astra{--c:var(--m-astra)}
.legend-i .series-stroke{stroke-width:2.4;stroke-linecap:round}
svg.chart .series-stroke{stroke:var(--c);fill:none}
svg.chart .series-line{stroke-width:2.1;stroke-linejoin:round;stroke-linecap:round;
  transition:stroke-dashoffset 1.1s cubic-bezier(.4,0,.2,1)}
svg.chart .series-dot{fill:var(--c);opacity:0;transition:opacity .5s cubic-bezier(.4,0,.2,1) 1.05s}
svg.chart .series-end{fill:var(--c);font-family:var(--mono);font-size:12px;font-weight:700;
  opacity:0;transform:translateY(6px);
  transition:opacity .5s cubic-bezier(.4,0,.2,1) 1.05s,
             transform .5s cubic-bezier(.4,0,.2,1) 1.05s}
svg.chart .series.animate .series-dot,
svg.chart .series.animate .series-end{opacity:1;transform:translateY(0)}

.s-fill-fable51{fill:var(--m-fable51)} .s-fill-opus5{fill:var(--m-opus5)}
.s-fill-opus48{fill:var(--m-opus48)}   .s-fill-sol{fill:var(--m-sol)}
.s-fill-terra{fill:var(--m-terra)}   .s-fill-astra{fill:var(--m-astra)}
svg.chart .bar{transform-box:fill-box;transform-origin:left center;transform:scaleX(0);transition:transform .8s cubic-bezier(.4,0,.2,1)}
svg.chart .bar.animate{transform:scaleX(1)}
svg.chart .value-label{fill:var(--ink);font-family:var(--mono);font-size:13px;font-weight:700;
  opacity:0;transform:translateY(10px);
  transition:opacity .8s cubic-bezier(.4,0,.2,1),transform .8s cubic-bezier(.4,0,.2,1)}
svg.chart .value-label.animate{opacity:1;transform:translateY(0)}

@media (prefers-reduced-motion: reduce){
  svg.chart .series-line,svg.chart .series-dot,svg.chart .series-end,
  svg.chart .bar,svg.chart .value-label{transition:none}
  svg.chart .bar{transform:scaleX(1)}
  svg.chart .series-dot,svg.chart .series-end,svg.chart .value-label{opacity:1;
    transform:translateY(0)}
}

/* yield chart (data engine) */
svg.chart .vbar{fill:var(--m-astra);transform-box:fill-box;transform-origin:bottom center;
  transform:scaleY(0);transition:transform .8s cubic-bezier(.4,0,.2,1)}
svg.chart .vbar.animate{transform:scaleY(1)}
svg.chart .cat-label{fill:var(--mut);font-family:var(--sans);font-size:12.5px;font-weight:600}
@media (prefers-reduced-motion: reduce){
  svg.chart .vbar{transform:scaleY(1);transition:none}
}

/* ---- additional series colours: transfer, RL ---- */
:root{
  --m-nohint:#94A7AB;
  --r-task:#86B8D7; --r-total:#DD8C86; --r-pen:#97A5AD;
  --r-nonzero:#DFB47C; --r-partial:#CECD8C; --r-success:#99C9A4;
}
:root[data-theme="light"]{
  --m-nohint:#5A6C70;
  --r-task:#1F77B4; --r-total:#BC4646; --r-pen:#5A6C70;
  --r-nonzero:#A9671B; --r-partial:#7A791D; --r-success:#35783D;
}
.s-nohint{--c:var(--m-nohint)}
/* Fig. 8 token lines: warm for the cumulative spend, cool for the per-trajectory cost,
   both distinct from the tan level bars beside them */
.s-tok-cum{--c:var(--r-total)}     .s-tok-per{--c:var(--r-task)}
svg.chart .t-cum{fill:var(--r-total)} svg.chart .t-per{fill:var(--r-task)}
.s-rl-task{--c:var(--r-task)}       .s-rl-total{--c:var(--r-total)}
.s-rl-pen{--c:var(--r-pen)}         .s-rl-trend{--c:var(--r-task)}
.s-rl-nonzero{--c:var(--r-nonzero)} .s-rl-partial{--c:var(--r-partial)}
.s-rl-success{--c:var(--r-success)}
svg.chart .vla-b{fill:var(--m-fable51)}
svg.chart .vla-b0{opacity:.22} svg.chart .vla-b1{opacity:.4} svg.chart .vla-b2{opacity:.58}
svg.chart .vla-b3{opacity:.78} svg.chart .vla-b4{opacity:1}
svg.chart .zero{stroke:var(--mut);stroke-width:1;opacity:.55}
svg.chart .series.s-rl-trend .series-line{stroke-width:1.4}
svg.chart .series.s-rl-pen .series-line,
svg.chart .series.s-rl-partial .series-line{stroke-width:1.7}

/* ================= scroll motion =================
   The hidden state is gated on html.reveal, which only JS adds — so with
   JavaScript off nothing is hidden and the page reads as plain static HTML. */

/* reveal-on-scroll */
html.reveal [data-rv]{opacity:0;transform:translateY(18px);
  transition:opacity .72s cubic-bezier(.22,.61,.36,1),
             transform .72s cubic-bezier(.22,.61,.36,1)}
html.reveal [data-rv].rv-in{opacity:1;transform:none}

/* hero entrance: same curve, a touch further travel */
html.reveal [data-rv-hero]{opacity:0;transform:translateY(26px);
  transition:opacity .82s cubic-bezier(.22,.61,.36,1),
             transform .82s cubic-bezier(.22,.61,.36,1)}
html.reveal [data-rv-hero].rv-in{opacity:1;transform:none}

/* section rules draw themselves out from the left */
html.reveal hr.rule{transform:scaleX(0);transform-origin:left center;
  transition:transform 1s cubic-bezier(.22,.61,.36,1)}
html.reveal hr.rule.rv-in{transform:scaleX(1)}

@media (prefers-reduced-motion: reduce){
  html.reveal [data-rv],
  html.reveal [data-rv-hero]{opacity:1;transform:none;transition:none}
  html.reveal hr.rule{transform:none;transition:none}
}

/* ---------- Title stage: the paper title, authors and organizations pop in on scroll, then hold as a full page.
   header.hero is a tall scroll track; .title-sticky pins one viewport inside it. assets/js/title.js sets
   .is-live and drives --t (0..1) on every [data-pop]; without JS or with reduced motion everything is simply shown. */
header.hero{position:relative;isolation:isolate;z-index:2;height:var(--title-track,175vh);color:#f3f1e9;scroll-margin-top:0;
  margin-top:-108vh;margin-top:-108svh}      /* pins as the lit bulb's last wisps dissolve: the wordmark blooms out of the dark */
header.hero:not(.is-live){height:auto}
.title-sticky{position:sticky;top:var(--nav-h);height:calc(100vh - var(--nav-h));height:calc(100svh - var(--nav-h));min-height:540px;overflow:hidden;
  transform:translateY(var(--hero-shift,0px));opacity:var(--hero-opacity,1);will-change:transform,opacity}
header.hero:not(.is-live) .title-sticky{position:relative}
.site-universe{position:fixed;inset:var(--nav-h) 0 0 0;z-index:-1;overflow:hidden;pointer-events:none;
  background:#060e12;opacity:var(--universe-opacity,1)}
/* Light theme: the night sky belongs to the bulb and title pages only. hero.js fades it to .32 as the title page
   scrolls off (a faint field under the dark research sections); here that .32 is remapped to 0, so the research
   sits on the real light background instead of a grey-tinted one. */
:root[data-theme="light"] .site-universe{opacity:calc((var(--universe-opacity,1) - .32) / .68)}
.hero-atmosphere{position:absolute;inset:0;z-index:-2;pointer-events:none;
  background:radial-gradient(ellipse at 25% 52%,#0b343e66,transparent 55%),
    radial-gradient(ellipse at 80% 48%,#593d242f,transparent 50%)}
.hero-atmosphere::before{content:"";position:absolute;width:78%;height:65%;left:11%;top:17%;
  border:1px solid #6ea4a526;border-radius:50%;transform:rotate(-22deg);
  box-shadow:0 0 90px #67c4c00b,inset 0 0 90px #67c4c00b}
.hero-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}
.hero a{color:inherit;text-decoration:none}
.hero a:hover{color:#9ed9d6}
.hero :focus-visible{outline-color:#a8e0dc}

/* the pop: rise, un-blur and settle to full size. --t is eased in JS; the hidden state exists only while live */
header.hero.is-live [data-pop]{opacity:calc(var(--t,0) * (1 - var(--x,0)));
  transform:translate3d(0,calc((1 - var(--t,0)) * var(--pop-y,26px) - var(--x,0) * var(--exit-y,18px)),0)
    scale(calc(1 - var(--pop-scale,.06) * (1 - var(--t,0))));
  filter:blur(calc((1 - var(--t,0)) * var(--pop-blur,9px) + var(--x,0) * var(--pop-blur,9px)))}
header.hero.is-live [data-pop]:not(.is-set){will-change:opacity,transform,filter}
header.hero.is-live [data-pop].is-set{filter:none}

.title-copy{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:56px 24px;pointer-events:none}
.title-copy>*{pointer-events:auto}
header.hero h1{display:flex;flex-direction:column;align-items:center;gap:clamp(8px,1.2vw,16px);margin:0;
  color:#f3f1e9;text-shadow:0 2px 35px #060e12b3;line-height:1.05}
header.hero h1 .w{display:inline-block;white-space:nowrap}
.title-mark{font-size:clamp(44px,7.8vw,112px);font-weight:560;letter-spacing:-.065em}
.title-mark b{font-weight:330;color:#d8e4df}
.title-line{font-size:clamp(17px,2.2vw,32px);font-weight:430;letter-spacing:-.03em;color:#dbe6e2;
  white-space:nowrap;line-height:1.2}                                       /* one line down to ~760px; wraps on phones */
.title-line .w{margin:0 .04em}

.title-people{display:flex;flex-direction:column;align-items:center;gap:clamp(10px,1.6vh,16px);
  margin:clamp(40px,7vh,72px) auto 0;max-width:min(960px,92vw)}
.title-tier{display:flex;flex-wrap:wrap;justify-content:center;align-items:baseline;column-gap:clamp(14px,2vw,24px);row-gap:4px;
  font-size:clamp(14px,1.1vw,15.5px);font-weight:450;letter-spacing:-.01em;line-height:1.45;color:#e2eae7}
.title-tier .au{white-space:nowrap}
.title-tier.wide{max-width:min(690px,88vw)}                                    /* contributors: two balanced rows, not 7 + 2 */
.title-tier sup{font:11px var(--mono);color:#9ed9d6;margin-left:3px;vertical-align:.55em;line-height:0}
.title-tier a:hover{color:#9ed9d6;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.tier-label{flex-basis:100%;font:11px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:#8ea6a8;margin-bottom:-3px}
.tier-label sup{margin-left:2px;vertical-align:.4em}
.title-tier:first-child{font-size:clamp(15.5px,1.3vw,18px);font-weight:500;color:#f3f1e9}
.title-tier:first-child .tier-label{color:#9ed9d6}
.title-orgs{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:clamp(12px,1.6vw,22px);
  margin:clamp(30px,4.5vh,48px) 0 0;font:clamp(11.5px,.95vw,13px) var(--sans);font-weight:500;letter-spacing:.16em;
  text-transform:uppercase;color:#bccbc8}
.title-orgs sup{font:10.5px var(--mono);color:#9ed9d6;letter-spacing:0;margin-right:7px;vertical-align:.5em;line-height:0}
.title-orgs .org{display:inline-flex;align-items:center}
.title-orgs img{height:clamp(18px,1.7vw,24px);width:auto;display:inline-block;opacity:.88;
  filter:brightness(0) invert(1)}                                            /* every mark in one light tint */
.title-orgs img[alt="ByteDance Seed"]{height:clamp(16px,1.5vw,21px)}
.title-orgs img[alt="CMU"]{height:clamp(16px,1.5vw,21px)}
.title-orgs img[alt="Princeton"]{height:clamp(20px,1.9vw,27px)}
.title-orgs img[alt="Yale"]{height:clamp(19px,1.8vw,26px)}
.title-orgs img[alt="UCLA"]{height:clamp(15px,1.4vw,20px)}
.title-orgs i{width:1px;height:18px;background:#76979666}
.title-notes{margin:clamp(10px,1.6vh,16px) auto 0;max-width:62ch;font:12.5px var(--mono);letter-spacing:.04em;color:#8ea6a8;text-wrap:balance}
@media (min-width:1080px){.title-notes{max-width:none;white-space:nowrap}}   /* one line where it fits; wraps below */
.title-notes sup{color:#9ed9d6;font-size:10.5px;vertical-align:.4em;line-height:0}

.hero-bottomline{display:flex;align-items:center;justify-content:center;margin-top:clamp(36px,5.5vh,60px);--pop-y:14px}   /* in the flow, just under the logos */
.hero-scroll{display:flex;align-items:center;gap:15px;font-size:12.5px;letter-spacing:.03em;white-space:nowrap;color:inherit;text-decoration:none}
.hero-scroll-arrow{width:30px;height:42px;display:grid;place-items:center;font-size:20px;
  border:1px solid #b8ccc64a;border-radius:20px;transition:background .2s}
.hero-scroll:hover .hero-scroll-arrow{background:#b8ccc617}
@media (max-width:700px){
  .wrap{padding:0 20px}section{padding-top:64px}#tasks{padding-top:6px}#overview{padding-top:28px}
  :root{--nav-h:52px}nav.top .row{grid-template-columns:auto 1fr auto;gap:8px}nav.top .brand{font-size:14px}
  nav.top .nav-links{justify-content:flex-start;gap:0}nav.top .lnk{font-size:13px;padding:8px 8px;gap:4px}nav.top .lnk.soon small{display:none}
  nav.top .gallery-cta{font-size:12.5px;padding:8px 11px}nav.top .gallery-cta .ic{display:none}
  nav.top .gallery-cta .cta-long{display:none}nav.top .gallery-cta .cta-short{display:inline}nav.top .nav-tools{gap:6px}
  nav.top .lnk{font-size:12.5px;padding:8px 6px}button.theme{width:30px;height:30px;font-size:13px}
  .box{padding:22px}.chart-card{padding:18px 14px 12px}
  .sec-head p.lede, p.lede{font-size:16px}
  header.hero{--title-track:170vh}
  .title-copy{padding:80px 18px}
  .title-mark{font-size:clamp(44px,13vw,64px)}.title-line{font-size:clamp(19px,5.4vw,26px);white-space:normal;max-width:20ch;text-wrap:balance}
  .title-people{margin-top:30px;gap:10px}.title-tier{column-gap:12px;row-gap:3px;font-size:13.5px}
  .title-tier:first-child{font-size:14.5px}
  .title-orgs{gap:12px 18px;font-size:11px;margin-top:26px}.title-orgs i{display:none}
  .title-notes{font-size:12px;margin-top:10px}
  .hero-bottomline{margin-top:30px}
}
@media (max-height:540px) and (min-width:701px){
  .title-sticky{min-height:400px}.hero-bottomline{margin-top:22px}
  .title-mark{font-size:clamp(42px,8vw,88px)}
  .title-line{font-size:clamp(18px,2.6vw,30px)}.title-people{margin-top:18px;gap:10px}.title-tier{font-size:14px}
}
@media (prefers-reduced-motion: reduce){
  header.hero{height:auto;margin-top:0}.title-sticky{position:relative;transform:none;opacity:1;will-change:auto}   /* no track: the page follows the bulb */
  header.hero.is-live [data-pop]{opacity:1;transform:none;filter:none;will-change:auto}
  .hero-scroll-arrow{transition:none}
}

/* ---------- Bulb intro (scroll-scrubbed frames before the hero) ---------- */
.bulb-stage{position:relative;height:400vh;z-index:1}                 /* longer = slower scrub */
.bulb-sticky{position:sticky;top:var(--nav-h);height:calc(100vh - var(--nav-h));height:calc(100svh - var(--nav-h));overflow:hidden}
.bulb-sticky canvas{position:absolute;inset:0;width:100%;height:100%;display:block;background:#060e12;
  opacity:calc(1 - var(--fade,0))}                                      /* the lit bulb dissolves into the starfield */
.bulb-hint{position:absolute;left:0;right:0;bottom:30px;display:flex;flex-direction:column;align-items:center;gap:6px;
  font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:#b5c5c4;transition:opacity .3s}
.bulb-hint span:last-child{animation:bulb-bob 1.6s ease-in-out infinite}
.bulb-stage.is-scrolled .bulb-hint{opacity:0}
@keyframes bulb-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}
/* full-screen "Loading Experience..." screen until every frame is in (assets/js/bulb.js; text + three spinning rings,
   after doorman-humanoid.github.io). html.bulb-loading locks the scroll; .hidden fades it out before it is removed. */
html.bulb-loading{overflow:hidden}
.loading-screen{position:fixed;inset:0;z-index:9999;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:#000;opacity:1;transition:opacity .8s ease}
.loading-screen.hidden{opacity:0;pointer-events:none}
.loading-text{font:500 1.5rem/1 var(--sans);letter-spacing:2px;color:#9ED9D6;margin-bottom:2rem}
.loading-spinner{position:relative;width:60px;height:60px}
.loading-spinner i{position:absolute;inset:0;border:3px solid transparent;border-top-color:#9ED9D6;border-radius:50%;
  animation:spin 1.5s cubic-bezier(.68,-.55,.265,1.55) infinite}
.loading-spinner i:nth-child(2){border-top-color:#C5EDEA;animation-duration:2s;animation-delay:-.3s}
.loading-spinner i:nth-child(3){border-top-color:#5FA7A3;animation-duration:2.5s;animation-delay:-.6s}
@keyframes spin{to{transform:rotate(360deg)}}
@media (max-width:640px){.loading-text{font-size:1.2rem;letter-spacing:1px}.loading-spinner{width:50px;height:50px}}
@media (prefers-reduced-motion: reduce){.loading-spinner i{animation-duration:4s}}
@media (prefers-reduced-motion: reduce){.bulb-hint span:last-child{animation:none}}