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@keyframes flow-dash{to{stroke-dashoffset:-24}}
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/* Editorial refinement: readable type, explicit pairs, aligned comparisons. */
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h1,h2,h3{text-wrap:balance}
body{font-size:18px;line-height:1.55}
.hero{padding:32px 0 26px}.hero h1>span{font-size:54px}.hero h1{font-size:33px}
.authors{margin-top:18px}.hero-actions{margin-top:18px}.author-note{font-size:12px}
.idea{padding:25px 0 28px}.idea-copy{gap:48px}.idea h2{font-size:30px;max-width:480px}.idea-copy p:not(.eyebrow){font-size:17px;line-height:1.55;margin-top:12px}.eyebrow{font-size:12px;letter-spacing:.11em}
.concept-strip{padding:17px 22px}.concept-agent strong{font-size:20px}.concept-exchange{font-size:14px;max-width:275px}.concept-agent span:not(.node-icon){font-size:14px}
.hero-evidence{margin-top:19px}.hero-evidence strong{font-size:30px}.hero-evidence small{font-size:12px}
.section{padding:44px 0}.section-heading{align-items:start;margin-bottom:24px;gap:42px}.section-heading h2{font-size:36px;max-width:710px}.section-heading>p{font-size:17px;line-height:1.55;max-width:380px;padding-top:26px}.method-section .section-heading>p{max-width:400px}
.walkthrough-top{padding:10px 18px}.motion-controls label,.motion-controls button,#play-status{font-size:13px}.motion-controls input{width:16px;height:16px}.motion-controls button{min-height:34px}.step-nav button{padding:11px 15px 14px}.step-nav button>span{font-size:12px;margin-bottom:4px}.step-nav strong{font-size:16px}.step-nav small{font-size:12px;line-height:1.4}
.stage-heading{padding:22px 25px 8px;min-height:154px;grid-template-columns:minmax(0,1fr) 274px;gap:28px}.stage-heading h3{font-size:26px;text-wrap:pretty;letter-spacing:-.025em}.stage-heading p:not(.eyebrow){font-size:16px;line-height:1.5;margin-top:8px}.io-summary{padding-left:20px}.io-summary b{font-size:11px;letter-spacing:.08em}.io-summary p{font-size:14px!important;margin-bottom:8px!important}
.method-scene{height:415px;aspect-ratio:auto}.agent-unit{font-size:16px;left:1.8%;width:13%}.agent-unit small{font-size:12px;white-space:normal;max-width:130px;line-height:1.35}.agent-glyph{width:56px;height:53px}.target-agent{top:11%}.failure-agent{top:66%}.environment{left:1.8%;width:13%;top:43%;font-size:14px}.environment small{font-size:11px;white-space:normal}.trajectory{left:17.5%;width:21%;padding:15px 12px}.trajectory-a{top:10.5%}.trajectory-b{top:65%}.trajectory-title{gap:7px}.trajectory-title strong{font-size:14px;line-height:1.25}.sample-id{font-size:12px;color:#fff;background:var(--blue);width:22px;height:23px}.red .sample-id{background:var(--red)}.sample-id:after{content:none!important}.trajectory>small{font-size:13px;line-height:1.3}.trace{margin:14px 0 10px}.hard-tag{top:-15px;right:10px;font-size:13px;padding:3px 8px}.pair-panel{left:49%;width:46%;padding:15px 20px}.pair-heading{font-size:17px}.loss-tag{font-size:12px;padding:3px 7px}.target-pair{top:6%;height:39%}.failure-pair{top:65%;height:31%}.pair-panel>p{font-size:12px;margin-top:9px}.pair-panel .sample-token{font-size:14px}.sample-token>b{width:27px;height:27px;font-size:14px}.sample-token small{font-size:12px}.preference{margin-top:16px}.prefer-sign{font-size:29px}
.expert-pairs{display:grid;gap:6px;margin-top:11px}.expert-pair-row{display:grid;grid-template-columns:minmax(0,1fr) 45px minmax(0,1fr);gap:10px;align-items:center;min-height:30px}.expert-label{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600}.expert-label .icon{width:21px;height:23px}.expert-pair-row .prefer-sign{text-align:center}.expert-pair-row .sample-token{justify-self:center}.target-pair .pair-panel>p{margin-top:6px}.loop-label{top:44%;height:20%}.loop-symbol{font-size:45px}.loop-label strong{font-size:20px}.loop-label small{font-size:13px}.walkthrough-bottom{padding:11px 19px;min-height:57px}.walkthrough-bottom p{font-size:15px}.transport button{height:34px;width:34px}.method-note{font-size:12px;line-height:1.55;margin-top:11px}.inference-note{padding-top:17px;margin-top:18px}.inference-note strong{font-size:18px}.inference-note span{font-size:16px}.update-badge{font-size:11px;letter-spacing:0;top:-21px}
.case-study h3{font-size:28px}.case-header{margin-bottom:12px}.case-kicker{font-size:14px}.case-meta{font-size:13px}.instruction p{font-size:17px}.instruction{margin:16px 0 20px}.case-columns{grid-template-rows:auto repeat(3,auto);gap:0 40px}.case-column{display:grid;grid-template-rows:subgrid;grid-row:span 4}.case-path{display:contents}.case-column-heading{margin-bottom:18px}.case-path li{min-height:0;margin-left:12px;padding:0 0 20px 32px}.case-path b{font-size:17px}.case-path p{font-size:16px;line-height:1.5;margin-top:6px}.case-path li:before{font-size:12px}.case-path blockquote{font-size:14px}.outcome{font-size:13px}.case-lesson{font-size:17px;margin-top:5px;padding-top:14px}.case-lesson strong{color:var(--ink)}.source-note{font-size:12px;line-height:1.6}.training-case{margin-top:38px}
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@media(max-width:750px){
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}
@media(max-width:370px){.site-header{padding:0 11px}.brand{font-size:12px}.brand-symbol{font-size:23px}nav{font-size:12px;gap:10px}.hero h1>span{font-size:29px}.hero h1{font-size:23px}.hero-actions{gap:10px 12px}.hero-actions .text-link{width:100%;padding:1px}.motion-controls{gap:6px}.motion-controls label{font-size:11px}.walkthrough-top>span{font-size:12px;max-width:95px}.step-nav strong{font-size:12px}.stage-heading h3{font-size:22px}.stage-heading{min-height:254px}.trajectory-title strong{font-size:12px}.pair-panel{padding:14px 12px}.expert-label{font-size:13px}.pair-heading{font-size:14px}.pair-panel .sample-token{font-size:12px}.small-bar{grid-template-columns:136px minmax(0,1fr) 43px;font-size:13px}.chart-model{font-size:14px;grid-template-columns:22px minmax(0,1fr) 120px}.chart-cell{gap:12px}.mobile-metric{font-size:13px}}

html{scroll-behavior:auto}.button:disabled{color:var(--muted);opacity:1}.button:disabled .button-detail{opacity:1}

/* Problem → idea → hard-negative explainer. */
.idea-stack{display:grid;gap:20px}.idea-block{display:grid;grid-template-columns:160px minmax(0,1fr);gap:30px;align-items:start}.idea-block .eyebrow{padding-top:7px}.idea-block h2{font-size:31px;max-width:none}.idea-block p:not(.eyebrow){font-size:17px;line-height:1.5;margin-top:8px;max-width:760px}.idea-block em{font-style:normal;color:var(--red)}.solution-block{border-top:1px solid var(--line);padding-top:20px}.hard-negative-figure{margin-top:24px;border:1px solid var(--line);border-radius:8px;background:#fff;overflow:hidden}.failure-comparison{display:grid;grid-template-columns:minmax(0,1fr) 46px minmax(0,1fr);align-items:stretch;padding:23px 26px 18px;background:var(--soft)}.failure-card{position:relative;border:1px solid var(--line);border-radius:7px;background:#fff;padding:17px 18px 15px;min-height:165px}.failure-card-head{display:flex;justify-content:space-between;gap:18px;align-items:center;font-size:13px}.failure-card-head span{font-weight:700}.failure-card-head b{font-size:11px;padding:3px 7px;border:1px solid var(--line);border-radius:4px;color:var(--muted);white-space:nowrap}.hard-card{border-color:#c98577;box-shadow:0 0 0 3px #b455420d}.hard-card .failure-card-head span,.hard-card>strong{color:var(--red)}.hard-card .failure-card-head b{color:#8d4637;border-color:#d5a79e;background:var(--red-soft)}.hard-negative-label{position:absolute;right:15px;top:-12px;background:#e6bb61;color:#4a3519;border:1px solid #ba8d37;border-radius:4px;padding:3px 8px;font-size:11px;font-weight:700}.mini-trajectory{position:relative;height:26px;display:flex;align-items:center;justify-content:space-between;margin:24px 3px 15px}.mini-trajectory:before{content:'';position:absolute;left:0;right:0;top:12px;height:2px;background:#d6dde1}.mini-trajectory i{position:relative;z-index:1;width:10px;height:10px;border-radius:50%;background:#d6dde1;border:2px solid #fff;box-shadow:0 0 0 1px #c6d0d6}.mini-trajectory i.done{background:var(--blue);box-shadow:0 0 0 1px var(--blue)}.hard-card .mini-trajectory i.done{background:var(--red);box-shadow:0 0 0 1px var(--red)}.mini-trajectory i.fail{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:#fff;color:var(--red);border:1.5px solid var(--red);box-shadow:none;font:700 16px/1 Arial}.failure-card>strong{display:block;font-size:17px}.failure-card>p{font-size:14px;color:var(--muted);margin-top:3px}.versus-mark{display:grid;place-items:center;color:var(--muted);font-size:13px;font-weight:700}.hard-negative-definition{font-size:15px;line-height:1.5;text-align:center;padding:14px 22px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.hard-negative-definition b{color:var(--red)}.agent-exchange{display:grid;grid-template-columns:220px minmax(260px,1fr) 250px;gap:24px;align-items:center;padding:20px 26px}.exchange-agent{display:flex;align-items:center;gap:12px}.exchange-agent>div{display:flex;flex-direction:column}.exchange-agent strong{font-size:17px}.exchange-agent span:not(.node-icon){font-size:13px;color:var(--muted)}.target-exchange{color:var(--blue)}.failure-exchange{color:var(--red)}.exchange-arrows{display:grid;gap:13px}.exchange-row{display:grid;align-items:center;gap:10px;font-size:12px;font-weight:600}.exchange-row i{position:relative;height:2px;background:currentColor}.exchange-row i:after{content:'';position:absolute;right:-1px;top:-4px;border:5px solid transparent;border-left-color:currentColor}.blue-row{grid-template-columns:auto minmax(60px,1fr);color:var(--blue)}.red-row{grid-template-columns:minmax(60px,1fr) auto;color:var(--red)}.red-row i:after{right:auto;left:-1px;border-left-color:transparent;border-right-color:currentColor}.blue-row i:before,.red-row i:before{content:'';position:absolute;inset:-2px 0;background:repeating-linear-gradient(90deg,currentColor 0 12px,transparent 12px 20px);animation:exchange-flow 1.6s linear infinite}.blue-row i,.red-row i{background:#dbe2e6}.blue-row i:after,.red-row i:after{z-index:2}.hero-evidence{margin-top:18px}@keyframes exchange-flow{to{background-position:20px 0}}
@media(max-width:750px){.idea-stack{gap:16px}.idea-block{grid-template-columns:1fr;gap:0}.idea-block .eyebrow{padding-top:0}.solution-block{padding-top:16px}.idea-block h2{font-size:26px}.failure-comparison{grid-template-columns:1fr;padding:18px 14px;gap:12px}.versus-mark{height:20px}.failure-card{min-height:154px}.agent-exchange{grid-template-columns:1fr 1fr;gap:15px;padding:18px 14px}.exchange-agent{flex-direction:column;text-align:center}.exchange-arrows{grid-column:1/-1;grid-row:2}.blue-row{grid-template-columns:auto 1fr}.red-row{grid-template-columns:1fr auto}.exchange-agent strong{font-size:15px}.exchange-agent span:not(.node-icon){font-size:12px}.hard-negative-definition{text-align:left;font-size:14px;padding:13px 15px}}

/* Clear evidence and compact qualitative examples. */
.domain-evidence{grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:13px 0;margin-top:20px}.domain-evidence>p{justify-content:center;padding:0 22px;border-right:1px solid var(--line)}.domain-evidence>p:last-child{border-right:0}.domain-evidence strong{font-size:31px}.domain-evidence span{font-weight:700}.domain-evidence small{font-weight:400}.evidence-note{text-align:center;font-size:12px;color:var(--muted);margin-top:7px}.example-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.simple-case{border-top:2px solid var(--ink);padding-top:15px}.simple-case h3{font-size:25px;margin-top:8px}.simple-goal{font-size:15px;color:var(--muted);margin-top:6px}.before-after{display:grid;grid-template-columns:minmax(0,1fr) 34px minmax(0,1fr);align-items:stretch;margin-top:18px}.before-after>div{background:var(--soft);border:1px solid var(--line);border-radius:6px;padding:14px 14px 13px;min-height:142px}.before-after>.after{background:var(--blue-soft);border-color:#adc2d0}.negative-case .before-after>.after{background:var(--red-soft);border-color:#d3aaa2}.simple-label{display:block;text-transform:uppercase;letter-spacing:.08em;font-size:10px;font-weight:700;color:var(--muted);margin-bottom:8px}.before-after b{font-size:16px;line-height:1.3;display:block}.before-after p{font-size:13px;line-height:1.4;color:var(--muted);margin-top:5px;min-height:36px}.before-after em{font-style:normal;display:inline-block;margin-top:9px}.case-arrow{font-style:normal;display:grid;place-items:center;font-size:21px;color:var(--muted)}.reward-chip{font-size:11px;font-weight:700;padding:3px 7px;background:#fff;border:1px solid var(--line);border-radius:4px}.hard-chip{color:var(--red);border-color:#c99084}.domain-gains{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:7px;overflow:hidden;margin:2px 0 22px}.domain-gains article{display:flex;align-items:center;gap:12px;padding:16px 17px;border-right:1px solid var(--line);background:#fff}.domain-gains article:last-child{border-right:0}.domain-gains strong{font-size:28px;line-height:1;color:var(--blue);letter-spacing:-.04em}.domain-gains span{font-size:14px;font-weight:700;line-height:1.25}.domain-gains small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:3px}.domain-gains .overall-gain{background:var(--blue-soft)}.chart-cell{position:relative;padding-bottom:32px!important}.gain-badge{position:absolute;right:0;bottom:8px;color:var(--blue);font-size:13px;line-height:1;background:var(--blue-soft);border-radius:3px;padding:3px 5px}.result-takeaway{background:var(--blue-soft);border:0;border-radius:6px;padding:16px 18px;margin-top:20px}.result-takeaway>strong{color:var(--blue)}
@media(max-width:750px){.domain-evidence{grid-template-columns:1fr;gap:0}.domain-evidence>p{justify-content:flex-start;border-right:0;border-bottom:1px solid var(--line);padding:10px 2px}.domain-evidence>p:last-child{border-bottom:0}.example-grid{grid-template-columns:1fr;gap:26px}.before-after{grid-template-columns:1fr;gap:8px}.case-arrow{height:20px;transform:rotate(90deg)}.domain-gains{grid-template-columns:1fr 1fr}.domain-gains article{border-bottom:1px solid var(--line)}.domain-gains article:nth-child(2){border-right:0}.domain-gains article:nth-child(3),.domain-gains article:nth-child(4){border-bottom:0}.chart-cell{padding-bottom:12px!important}.gain-badge{position:static;justify-self:end;grid-column:3;margin-top:3px}}

@media(min-width:751px){.method-scene{height:380px}.stage-heading{min-height:139px;padding-top:18px}.target-pair{height:43%;top:4.5%}.failure-pair{height:33%;top:65%}.pair-panel{padding-top:13px;padding-bottom:12px}.pair-panel>p{margin-top:6px}.loop-label{top:46%;height:17%}.agent-unit small{font-size:12px}.trajectory-a{top:10%}.trajectory-b{top:65%}.method-section .section-heading{margin-bottom:21px}.method-section .section-heading h2{font-size:34px}}
.method-scene[data-stage="4"][data-beat="1"] .trajectory-a,.method-scene[data-stage="4"][data-beat="2"] .trajectory-b{box-shadow:0 0 0 5px #285d8510}.method-scene[data-stage="4"] .trajectory-b{box-shadow:0 0 0 5px #b4554210}
.environment small{display:none}
@media(min-width:751px){.method-scene[data-stage="3"] .pair-panel{opacity:1}.method-scene[data-stage="3"] .trajectory{opacity:.85}}

.authors>span{white-space:nowrap}@media(max-width:500px){.hero-actions .text-link{display:none}.authors br{display:none}}
/* Only the routes used by the current stage are emphasized. */
.method-scene .edge{opacity:0}
.method-scene .collect-edge{opacity:.25}
.method-scene[data-stage="0"] .collect-edge,.method-scene[data-stage="0"] .environment-edge{opacity:.8}
.method-scene[data-stage="1"] .pair-edge,.method-scene[data-stage="2"] .expert-edge{opacity:.85}
.method-scene[data-stage="3"] .update-edge,.method-scene[data-stage="4"] .update-edge{opacity:1}
.method-scene[data-stage="4"] .collect-edge{opacity:.8}
.method-scene[data-stage="4"] .pair-edge,.method-scene[data-stage="4"] .expert-edge{opacity:0}
@media(max-width:750px){.trajectory-title{min-height:34px}.trajectory{min-height:140px}.method-scene[data-stage="3"] .target-pair{top:49%}.method-scene[data-stage="3"] .failure-pair{top:77%}}
@media(min-width:751px){.trajectory-b,.failure-pair{top:62%}.environment{top:41%}}
.walkthrough{overflow:clip}.walkthrough-top{position:sticky;top:64px;z-index:8;background:#fff}
@media(max-width:750px){.walkthrough-top{top:55px}}

/* Keep citation compact after removing the repeated paper introduction. */
.citation-section .citation{max-width:780px;margin:0 auto}