:root{--bg:#faf9f5;--surface:#fffefa;--text:#242321;--accent:#315f50;--rule:#deddd5;--wash:#f0f1ea;color-scheme:light;font-family:Georgia,'Times New Roman','Songti SC','SimSun',serif;font-size:18px;line-height:1.65;scroll-behavior:smooth}
:root[data-theme=dark]{--bg:#181d1a;--surface:#232a25;--text:#e7ece5;--accent:#afd0ba;--rule:#435147;--wash:#29362d;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;color:var(--text);background:var(--bg);isolation:isolate}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration:underline}button,input,select{font:inherit;color:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}[hidden]{display:none!important}html[lang=en] .i18n[lang=zh],html[lang=zh] .i18n[lang=en]{display:none}h1,h2,h3,h4{font-weight:400;line-height:1.25;letter-spacing:-.025em}h1{font-size:clamp(42px,6vw,70px)}h2{font-size:clamp(30px,4vw,42px);text-align:center;margin:0 0 38px}h3{font-size:25px;margin:30px 0 14px}h4{font-size:21px;margin:0 0 12px}p{margin:0 0 22px}figure{margin:0}img{display:block;max-width:100%;height:auto}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:5px}main:focus{outline:none}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:fixed;left:12px;top:-100px;background:var(--surface);padding:12px;z-index:100}.skip-link:focus{top:12px}
.site-header{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--rule)}.header-inner{max-width:1210px;min-height:84px;margin:auto;padding:18px 34px;display:flex;gap:30px;align-items:center}.brand{font-size:20px;font-weight:600;color:var(--text);text-decoration:none;white-space:nowrap}.header-inner nav{display:flex;gap:23px;margin-left:auto;font-size:16px}.header-inner nav a{text-decoration:none;padding:4px 0;border-bottom:1px solid transparent;white-space:nowrap}.header-inner nav a[aria-current],.header-inner nav a:hover{border-color:var(--accent)}.preferences{display:flex;gap:14px}.preferences button{border:0;background:none;padding:6px 0;font-size:15px;white-space:nowrap}
main{max-width:1160px;margin:auto;padding:0 42px}.intro{text-align:center;padding:76px 0 72px}.intro h1{margin:0 0 22px}.intro .subtitle{font-size:27px;max-width:780px;margin:0 auto 20px;line-height:1.4}.intro>p:not(.subtitle){max-width:690px;margin:0 auto}.intro-links{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:30px}.button{display:inline-block;border:1px solid var(--rule);background:var(--surface);padding:9px 18px;border-radius:4px;text-decoration:none;font-size:17px;min-height:44px}.button:hover{border-color:var(--accent);text-decoration:none}.primary{background:var(--accent);color:var(--bg);border-color:var(--accent)}.chapter{padding:64px 0;border-top:1px solid var(--rule);scroll-margin-top:100px}.prose{max-width:920px;margin:30px auto 0}.prose p{line-height:1.8}.framework-figure{background:#fff;max-width:1040px;margin:auto}.metric-equation{font-size:26px;text-align:center;border-block:1px solid var(--rule);padding:18px;margin-block:24px}.distribution-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:48px;align-items:start;margin-bottom:36px}table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}caption{text-align:left;font-size:23px;padding-bottom:16px}th,td{padding:10px 12px;border-bottom:1px solid var(--rule);text-align:right;font-weight:400;vertical-align:middle}th:first-child,td:first-child{text-align:left}thead th{font-weight:600;font-size:16px}tbody th{ text-align:left}tfoot{background:var(--wash)}.distribution-grid th:first-child{padding-left:0}.distribution-grid td{width:54px}.source-distribution th,.source-distribution td{padding-inline:8px}.source-distribution tfoot th{padding-left:8px}.source-distribution tbody th{white-space:nowrap}.text-link{display:inline-block;font-size:20px;margin-top:4px}
.board-tabs{display:flex;justify-content:center;gap:34px;border-bottom:1px solid var(--rule);margin-bottom:30px}.board-tabs button{border:0;border-bottom:2px solid transparent;background:none;padding:13px 4px;font-size:21px}.board-tabs button[aria-selected=true]{border-color:var(--accent);color:var(--accent)}.table-scroll{overflow-x:auto;scrollbar-width:thin}.paper-table{min-width:920px}.paper-table thead{background:var(--wash)}.paper-table thead th:nth-child(2){text-align:left}.paper-table tr[data-paper-record] th{font-size:23px;min-width:230px}.paper-table tr[data-paper-record] td{font-size:21px;padding-top:22px;padding-bottom:18px}.paper-table tr[data-paper-record] td:first-child{font-size:17px;width:45px}.paper-table tr[data-paper-record] td:nth-child(3){color:var(--accent);font-size:28px}.paper-table .scenario-row td{padding:14px 12px 22px 57px}.scenario-row dl{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:14px;margin:0}.scenario-row dt{font-size:15px;line-height:1.3;min-height:40px}.scenario-row dd{font-size:17px;margin:8px 0 0;white-space:nowrap}.scenario-row dd span{font-size:15px}.paper-table tr[data-paper-record]>*{border-bottom:0}.results-explanation{margin-top:26px}.experiment-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:30px;align-items:start;margin-top:20px}.experiment-image{background:#fff;height:290px;display:flex;align-items:center;justify-content:center}.experiment-image img{width:100%;height:100%;object-fit:contain}.experiment-grid h4{min-height:30px}.repository-table{overflow:auto}.repository-table strong,.repository-table span{display:block}.repository-table th{text-align:left}.repository-empty{padding:40px 0}.section-intro{max-width:780px;margin:0 auto 30px;text-align:center}.submission-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;list-style:none;counter-reset:steps;padding:0;margin:40px 0}.submission-steps li{border-top:1px solid var(--rule);padding-top:20px;counter-increment:steps}.submission-steps li:before{content:'0' counter(steps);color:var(--accent);font-size:22px}.submission-steps h3{font-size:23px;margin:12px 0}.submission-steps p{font-size:18px}.submission-status{padding:18px 0;border-top:1px solid var(--rule)}.submission-status a{margin-left:14px}.citation-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:25px}.citation-heading h2{margin:0}.copy-status{min-height:30px;margin:12px 0 0}pre{background:var(--wash);padding:24px;margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.8 Consolas,monospace;border:1px solid var(--rule);border-radius:3px}code{font:15px/1.6 Consolas,monospace;overflow-wrap:anywhere}footer{max-width:1160px;margin:auto;padding:28px 42px 40px;border-top:1px solid var(--rule);display:flex;flex-wrap:wrap;gap:28px;font-size:16px}footer button{margin-left:auto;background:none;border:0;font:inherit;color:var(--accent)}
.browser-heading{border-top:0;padding-top:48px}.browser-heading h1{font-size:42px;margin:0 0 22px}.task-filters{display:flex;gap:18px;align-items:end;margin:30px 0 22px}.task-filters label:first-child{flex:1}label>span{display:block;margin-bottom:6px}input,select{max-width:100%;min-height:44px;background:var(--surface);border:1px solid var(--rule);padding:8px 10px;border-radius:3px;font-size:17px}.task-filters input{width:100%}.task-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 36px}.task-entry{padding:22px 0;border-top:1px solid var(--rule);min-width:0}.task-entry h3{font-size:22px;margin:8px 0 13px}.task-entry h3 a{color:var(--text);text-decoration:none}.task-entry h3 a:hover{text-decoration:underline}.task-meta{font-size:16px;margin:0}.task-pager{display:flex;gap:24px;justify-content:center;align-items:center;margin-top:26px}.record-controls{display:flex;gap:20px;margin:25px 0}.record-controls label{flex:1;min-width:0}.record-controls select{width:100%}#records{scroll-margin-top:100px}#record-detail{margin-bottom:25px}#record-detail h3{margin-top:20px}.record-meta{overflow-wrap:anywhere;font-size:16px}.record-raw{max-height:440px;overflow:auto}.no-js-title{margin-top:40px}.js-ready .no-js-title{display:none}
.margin-motion{position:fixed;inset:84px 0 0;z-index:-1;pointer-events:none;overflow:hidden;mask-image:linear-gradient(to right,#000 0,#000 calc(50% - 630px),transparent calc(50% - 505px),transparent calc(50% + 505px),#000 calc(50% + 630px),#000 100%)}.margin-motion:after{content:'';position:absolute;inset:0;background:linear-gradient(var(--bg),transparent 12%,transparent 88%,var(--bg))}.margin-lane{position:absolute;inset-block:0;width:clamp(270px,25vw,500px)}.margin-left{left:-32px;transform:rotate(-6deg)}.margin-right{right:-32px;transform:rotate(6deg)}.margin-reel{animation:margin-drift 72s linear infinite;animation-play-state:paused}.margin-right .margin-reel{animation-duration:84s;animation-direction:reverse}.margin-motion[data-moving=true] .margin-reel{animation-play-state:running}.margin-group{display:grid;gap:70px;padding-bottom:70px}.margin-group img{width:100%;opacity:.26;filter:blur(1.7px);mix-blend-mode:multiply}:root[data-theme=dark] .margin-group img{filter:invert(1) hue-rotate(180deg) blur(1.7px);mix-blend-mode:screen}@keyframes margin-drift{to{transform:translateY(-50%)}}
@media(max-width:950px){.header-inner{flex-wrap:wrap;gap:10px 22px;padding:12px 22px}.header-inner nav{order:3;width:100%;margin:0;overflow:auto;gap:25px}.preferences{margin-left:auto}main{padding:0 24px}.chapter{padding:44px 0;scroll-margin-top:125px}.intro{padding:50px 0}.distribution-grid{gap:30px}.margin-motion{display:none}.experiment-image{height:230px}.task-filters{flex-wrap:wrap}.task-filters label:first-child{flex-basis:100%}}
@media(max-width:620px){:root{font-size:17px}.intro .subtitle{font-size:23px}.distribution-grid,.submission-steps,.task-grid,.experiment-grid{grid-template-columns:1fr;gap:28px}.experiment-image{height:auto;min-height:210px}.experiment-image img{height:auto}.prose{margin-top:24px}.task-filters{gap:12px}.task-filters label{flex:1;min-width:125px}.record-controls{flex-direction:column}.board-tabs{gap:22px}.board-tabs button{font-size:19px}.citation-heading{align-items:start}.citation-heading h2{font-size:32px}footer{padding-inline:24px}.submission-status a{display:block;margin:8px 0 0}.task-pager{gap:12px}.task-pager .button{padding-inline:12px}.metric-equation{font-size:23px}h2{margin-bottom:28px}.distribution-grid{grid-template-columns:minmax(0,1fr)}.source-distribution{table-layout:fixed}.source-distribution th,.source-distribution td{padding-inline:4px}.source-distribution th:first-child{width:38%}.source-distribution thead th:nth-child(2){width:18%}.source-distribution thead th:nth-child(3){width:26%}.source-distribution thead th:nth-child(4){width:18%}.source-distribution td{width:auto}.source-distribution tbody th{white-space:normal;overflow-wrap:anywhere}.source-distribution thead th{font-size:14px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}.margin-reel{animation:none!important}}@media print{.site-header,.margin-motion,.preferences,.board-tabs,footer button{display:none}main{padding:0;max-width:none}.chapter{break-inside:avoid}.table-scroll{overflow:visible}.paper-table{min-width:0}.intro{padding-top:0}}
.task-entry h3{overflow-wrap:anywhere}
.task-chart-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;margin-bottom:38px;--chart-soft:#bccfc5;--chart-ink:#315f50}.task-chart figcaption{font-size:21px;line-height:1.4;margin-bottom:24px}.difficulty-body{display:flex;align-items:center;gap:32px;min-height:218px}.difficulty-ring{width:180px;height:180px;flex-shrink:0;border-radius:50%;background:conic-gradient(var(--chart-ink) 0 var(--medium-share),var(--chart-soft) var(--medium-share) 100%);display:grid;place-items:center}.difficulty-ring>div{width:134px;height:134px;border-radius:50%;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:30px;line-height:1.3;font-variant-numeric:tabular-nums}.difficulty-ring>div span{font-size:16px}.difficulty-legend{flex:1;margin:0;font-variant-numeric:tabular-nums}.difficulty-legend>div+div{margin-top:24px}.difficulty-legend dt{display:flex;gap:10px;align-items:center}.difficulty-key{display:inline-block;width:10px;height:10px;background:var(--chart-ink)}.difficulty-key.hard{background:var(--chart-soft)}.difficulty-legend dd{margin:3px 0 0 20px;font-size:22px}.difficulty-legend dd span{font-size:17px}.subtask-axis{font-size:16px;margin-bottom:6px}.subtask-bars{list-style:none;display:grid;grid-auto-columns:1fr;grid-auto-flow:column;gap:22px;margin:0;padding:0;font-variant-numeric:tabular-nums}.subtask-bars li{min-width:0;text-align:center}.subtask-column{height:156px;display:flex;flex-direction:column;justify-content:end;position:relative;border-bottom:1px solid var(--rule)}.subtask-bar{height:calc(var(--bar-height) * .82);background:var(--chart-ink);width:62%;max-width:46px;align-self:center;flex-shrink:0}.subtask-value{font-size:17px;line-height:24px}.subtask-bin{display:block;font-size:17px;padding-top:7px}.scenario-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px}.scenario-heading h3{font-size:21px;margin:0 0 12px}.scenario-heading>span{font-size:16px}.scenario-summary dl{display:grid;grid-template-columns:1fr 1fr;column-gap:64px;margin:0 0 30px}.scenario-summary dl>div{display:flex;align-items:baseline;justify-content:space-between;gap:18px;padding:9px 0;border-bottom:1px solid var(--rule);font-size:17px}.scenario-summary dd{margin:0;color:var(--accent);font-variant-numeric:tabular-nums}.task-viewer-link{padding-top:8px}.task-viewer-link a{font-size:18px}:root[data-theme=dark] .task-chart-grid{--chart-soft:#456858;--chart-ink:#afd0ba}
@media(max-width:950px){.task-chart-grid{gap:32px}.difficulty-body{gap:22px}.difficulty-ring{width:150px;height:150px}.difficulty-ring>div{width:112px;height:112px}.scenario-summary dl{column-gap:32px}.subtask-bars{gap:14px}}
@media(max-width:620px){.task-chart-grid{grid-template-columns:1fr;gap:30px;margin-bottom:32px}.task-chart figcaption{font-size:20px;margin-bottom:16px}.difficulty-body{min-height:160px;gap:22px}.difficulty-ring{width:clamp(120px,35vw,150px);height:clamp(120px,35vw,150px)}.difficulty-ring>div{width:75%;height:75%}.difficulty-legend{max-width:160px}.scenario-summary dl{grid-template-columns:1fr}.scenario-heading h3{font-size:20px}.scenario-summary dl>div{font-size:16px}}
.submission-guide{max-width:1040px}.submission-guide .browser-heading{text-align:center}.submission-guide .browser-heading>p{max-width:720px;margin-inline:auto}.submission-guide .hero-links{display:flex;justify-content:center;align-items:center;gap:24px;flex-wrap:wrap;margin:30px 0 20px}.submission-guide .prose{margin-top:0}.guide-steps{padding:0;margin:0;list-style:none;counter-reset:guide}.guide-steps li{position:relative;padding:24px 0 24px 52px;border-top:1px solid var(--rule);counter-increment:guide}.guide-steps li:first-child{border-top:0;padding-top:0}.guide-steps li:before{content:counter(guide,decimal-leading-zero);position:absolute;left:0;color:var(--accent);font-size:22px;line-height:1.4}.guide-steps h3{margin:0 0 12px}.guide-steps p{line-height:1.8;margin:0}.guide-steps strong{font-weight:600}
@media(max-width:950px){#records{scroll-margin-top:125px}}
/* Blend the diagram's white canvas into the page without changing its source. */
.framework-figure{background:var(--bg);isolation:isolate}
.framework-figure>img{mix-blend-mode:multiply}
:root[data-theme=dark] .framework-figure>img{filter:invert(1) hue-rotate(180deg);mix-blend-mode:screen}
/* Desktop editorial rhythm shared by the overview and submission guide. */
@media(min-width:951px){
  /* Match the paper's experiment-figure fills; keep text in the site ink. */
  .task-chart-grid,:root[data-theme=dark] .task-chart-grid{--chart-ink:#79b7a6;--chart-soft:#e89575;--chart-bar:#a1acc9}
  .subtask-bar{background:var(--chart-bar)}
  #framework-explanation h3,.task-chart figcaption,.scenario-heading h3,.guide-steps h3{font-size:23px;line-height:1.4;letter-spacing:-.025em}
  #framework-explanation h3{margin:0 0 16px}
  #framework-explanation p:last-child,.submission-guide .prose p:last-child{margin-bottom:0}
  .difficulty-body{min-height:224px}
  .difficulty-legend dd,.subtask-value{font-size:20px;line-height:1.4}
  .submission-guide{max-width:1160px}
  .submission-guide .guide-steps{max-width:920px;margin-inline:auto}
  .submission-guide .prose{padding-left:52px}
  .submission-guide .prose+.guide-steps{margin-top:24px}
  .submission-guide #submission-controls>p{max-width:720px;margin:0 auto;line-height:1.8}
  .guide-steps li:before{font-size:23px;line-height:1.4;font-variant-numeric:tabular-nums}
}
/* One participant entry; setup actions belong beside their guide steps. */
.submission-entry{text-align:center;margin-top:28px}
.submission-entry>.button{font-size:19px;min-width:230px;padding:12px 24px}
.guide-action{margin-top:18px}
.submission-guide #submission-controls:empty{display:none}
.submission-guide .guide-start{font-size:18px;margin-bottom:0}
.guide-steps>li[id]{scroll-margin-top:110px}
@media(min-width:951px){
  #participate>.section-intro{max-width:710px;margin-bottom:0;font-size:19px}
  #participate .submission-steps{gap:36px;margin:36px 0 32px}
  #participate .submission-steps li{display:grid;grid-template-columns:28px 1fr;gap:12px;align-content:start;border-top:2px solid #79b7a6;padding-top:20px}
  #participate .submission-steps li:nth-child(2){border-color:#e89575}
  #participate .submission-steps li:nth-child(3){border-color:#a1acc9}
  #participate .submission-steps li:before{font-size:18px;line-height:32.2px;font-variant-numeric:tabular-nums}
  #participate .submission-steps h3{margin:0;font-size:23px;line-height:1.4}
  #participate .submission-steps p{grid-column:1/-1;margin:0;font-size:18px;line-height:1.7}
  #participate .step-link{grid-column:1/-1;justify-self:start;font-size:17px}
  #participate>.submission-status{margin:0;padding:0;border:0}
  #participate>.text-link{margin-top:16px;font-size:18px}
}