*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);background:var(--canvas);font:var(--body-size)/1.65 var(--font-body)}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{min-height:var(--control-height);border:1px solid var(--line);border-radius:var(--radius-sm);padding:9px 16px;background:var(--paper);color:var(--ink);cursor:pointer;font-weight:600}button:hover:not(:disabled){border-color:var(--brand);background:var(--soft)}button:disabled{cursor:not-allowed;opacity:.52}button.primary{background:var(--brand);color:var(--on-ink);border-color:var(--brand)}button.primary:hover:not(:disabled){background:var(--ink)}button.quiet{border-color:transparent;background:transparent}button.danger-outline{color:var(--danger)}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--font-title);line-height:1.35}h1{font-size:var(--title-size);letter-spacing:-.025em}h2{font-size:var(--h2-size)}h3{font-size:18px}p{margin-bottom:var(--space-3)}small,.small{font-size:var(--small-size)}[hidden]{display:none!important}.skip-link{position:absolute;top:-100px;left:12px;padding:12px;background:var(--paper);z-index:20}.skip-link:focus{top:8px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px var(--page-pad);background:var(--paper);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;border:0;padding:0;text-align:left;font-size:20px}.brand small{display:block;font-size:12px;font-weight:400;color:var(--muted);letter-spacing:.2em}.brand-mark{display:grid;place-items:center;width:46px;height:46px;border-radius:12px;background:var(--ink);color:var(--on-ink);font-size:23px}.top-actions,.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.pill{border-radius:30px;padding:5px 12px;font-size:12px;background:var(--soft);color:var(--ink);white-space:nowrap}.utility-bar{display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px;max-width:var(--page-width);margin:auto;padding:16px var(--page-pad)}.utility-bar label{display:flex;align-items:center;gap:10px;font-size:13px;margin:0}.utility-bar input{width:78px}.utility-bar select,.utility-bar input{padding:7px 9px;min-height:36px}.utility-bar small{color:var(--muted)}input,select,textarea{max-width:100%;border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px;background:var(--paper);color:var(--text);min-height:var(--control-height)}textarea{width:100%;resize:vertical;min-height:110px}input[type=checkbox],input[type=radio]{accent-color:var(--brand);min-height:18px;width:18px;height:18px;flex:none}label{display:block;margin:0 0 14px;font-weight:500}label>input:not([type=checkbox]):not([type=radio]),label>select,label>textarea{display:block;width:100%;margin-top:6px}.utility-bar label>input,.utility-bar label>select{margin:0;width:auto}.utility-bar label>input{width:78px}.check{display:flex;align-items:flex-start;gap:9px;font-weight:400;font-size:14px}.mode-banner{padding:10px var(--page-pad);background:var(--soft);color:var(--ink);text-align:center;font-size:13px;border-block:1px solid var(--line)}.mode-banner.live{background:var(--risk-bg);color:var(--danger)}.module-nav{display:flex;gap:8px;padding:14px var(--page-pad);max-width:var(--page-width);margin:auto}.module-nav button{border:0;background:transparent;font-weight:500}.module-nav button.active{background:var(--ink);color:var(--on-ink)}main{max-width:var(--page-width);margin:auto;padding:12px var(--page-pad) 56px;outline:none}.notice{padding:12px 16px;background:var(--soft);border-left:3px solid var(--brand);border-radius:5px;font-size:14px;white-space:pre-line;overflow-wrap:anywhere;margin-bottom:18px}.notice.error{background:var(--risk-bg);border-color:var(--danger);color:var(--danger)}.hero{display:grid;grid-template-columns:1.55fr 1fr;gap:40px;align-items:center;padding:38px 0 40px}.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--brand);font-weight:700;margin-bottom:12px}.hero p.lead{font-size:18px;color:var(--muted);max-width:620px}.hero-aside{padding:25px 28px;border-left:3px solid var(--brand);background:var(--paper)}.hero-aside h3{margin-bottom:12px}.hero-aside p{font-size:14px;color:var(--muted);margin-bottom:0}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.module-card{display:flex;flex-direction:column;position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);overflow:hidden}.module-card .number{font:600 48px/1 var(--font-title);color:var(--brand);margin-bottom:25px}.module-card h2{font-size:23px}.module-card p{color:var(--muted);font-size:15px}.module-card .card-bottom{margin-top:auto;padding-top:18px}.module-card.core{border-top:4px solid var(--danger)}.module-card .tag{position:absolute;right:22px;top:24px;font-size:12px;color:var(--danger)}.home-note{margin-top:26px;font-size:13px;color:var(--muted)}.module-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:15px 0}.module-heading h1{font-size:32px;margin-bottom:10px}.module-heading p{max-width:760px}.muted{color:var(--muted);font-size:14px}.stepper{display:flex;list-style:none;gap:0;margin:0 0 24px;padding:0;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;background:var(--paper)}.stepper li{flex:1;padding:12px 16px;border-right:1px solid var(--line);font-size:14px}.stepper li:last-child{border:0}.stepper li.current{color:var(--brand);font-weight:700;background:var(--soft)}.stepper .step-num{font-size:12px;margin-right:7px}.work-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,1fr);gap:24px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);min-width:0}.panel h2{font-size:21px}.context-card{padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);margin-bottom:22px}.context-card p:last-child{margin:0}.simulation{display:inline-flex;padding:2px 8px;border-radius:4px;background:var(--soft);color:var(--brand);font-size:12px;margin-bottom:12px}.claim{padding:20px;border-left:3px solid var(--danger);background:var(--risk-bg);font-size:18px;line-height:1.8;margin:16px 0 24px}.choices{display:grid;gap:9px;margin-bottom:20px}.choice{display:flex;gap:12px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);margin:0;cursor:pointer}.choice:has(input:checked){border-color:var(--brand);background:var(--soft)}.source{border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px;margin-bottom:12px}.source summary{cursor:pointer;font-weight:600;color:var(--ink)}.source p{font-size:14px;margin:12px 0}.source small{display:block;color:var(--muted);margin-bottom:8px}.source .check{margin:8px 0 0}.field-review{border-bottom:1px solid var(--line);padding:8px 0 18px;margin-bottom:16px}.field-review textarea{min-height:70px}.review-step{padding:20px;background:var(--soft);border-radius:var(--radius-sm);margin:18px 0}.review-step h3{margin-bottom:10px}.review-step .counter{font-size:12px;color:var(--brand)}.step-dots{display:flex;gap:6px;margin:16px 0}.step-dots span{height:5px;flex:1;background:var(--line);border-radius:3px}.step-dots span.filled{background:var(--brand)}.fact-list{margin:12px 0;padding:0;list-style:none}.fact-list li{border-bottom:1px solid var(--line);padding:12px 0;font-size:14px}.fact-list li:last-child{border:0}.fact-list strong{color:var(--ink)}.chain-overview{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);margin-bottom:18px}.chain-overview svg{width:100%;min-width:800px;height:auto;display:block}.chain-edge{stroke:var(--line);stroke-width:3;fill:none}.chain-arrow{fill:var(--line)}.chain-node rect{fill:var(--paper);stroke:var(--line);stroke-width:2}.chain-node.has-actor rect{fill:var(--soft);stroke:var(--brand)}.chain-node.has-risk rect{stroke:var(--danger)}.chain-node text{fill:var(--ink);font-family:var(--font-body);font-size:17px}.chain-node .node-status{font-size:13px;fill:var(--muted)}.actor-bank{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.actor{font-size:13px;border:1px dashed var(--brand);background:var(--soft);padding:8px 12px;border-radius:6px;cursor:grab}.chain-stages{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}.stage-card{border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px;background:var(--paper);min-width:0}.stage-card.drag-over{border-color:var(--brand);background:var(--soft)}.stage-card.affected{background:var(--soft)}.stage-card h3{margin-bottom:8px}.stage-card .inline-select{display:flex;gap:6px;align-items:end}.inline-select label{margin:0;flex:1;min-width:0;font-size:12px}.inline-select select{font-size:13px;padding:8px}.inline-select button{font-size:12px;padding:8px}.assigned{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0;min-height:10px}.remove-actor{font-size:12px;min-height:32px;padding:4px 8px;background:var(--soft)}.stage-card textarea{min-height:75px;font-size:14px}.stage-card label{font-size:13px}.stage-card .check{margin-top:12px}.work-navigation{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.chat-shell{display:flex;flex-direction:column;gap:15px}.chat-log{min-height:180px;max-height:520px;overflow:auto;padding:2px}.chat-message{padding:14px 16px;border-radius:10px;background:var(--soft);margin-bottom:14px;white-space:pre-wrap;overflow-wrap:anywhere}.chat-message.student{background:var(--canvas);border:1px solid var(--line)}.chat-message small{display:block;color:var(--muted);font-size:11px;margin-bottom:7px}.chat-empty{padding:22px 0;color:var(--muted);font-size:14px}.snapshot-review{font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere;padding:15px;background:var(--canvas);border-radius:8px}.principle{padding:18px 20px;border-left:3px solid var(--danger);background:var(--risk-bg);color:var(--ink);font-weight:600;margin:18px 0}.result-card{margin-top:24px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:30px}.result-card .result-title{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:2px solid var(--ink);padding-bottom:16px}.result-body{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.9}.result-body h3{margin:24px 0 12px}.export-actions{margin:20px 0}.learning-note{font-size:12px;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:var(--radius);padding:28px;color:var(--text);background:var(--paper);width:min(600px,calc(100% - 28px));max-height:90vh;overflow:auto;box-shadow:var(--shadow)}dialog::backdrop{background:rgb(20 30 40 / 48%)}.dialog-heading{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:18px}.dialog-heading h2{margin:0}.security-note{font-size:12px;color:var(--muted);padding:12px;background:var(--canvas);border-radius:6px}#connection-status{margin-top:18px;margin-bottom:0}.alignment-item{padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}.alignment-item strong{display:block;color:var(--brand);margin-bottom:8px}footer{max-width:var(--page-width);margin:auto;padding:20px var(--page-pad);border-top:1px solid var(--line);color:var(--muted);font-size:12px}footer span{display:block}.loading{padding:40px;text-align:center}
@media(min-width:1500px){:root{--page-width:1440px;--body-size:18px;--h2-size:26px}.panel{padding:30px}}
@media(max-width:900px){.topbar{flex-wrap:wrap}.hero{grid-template-columns:1fr;gap:12px}.hero-aside{max-width:none}.work-grid{grid-template-columns:1fr}.module-card{padding:20px}.module-card h2{font-size:20px}.module-nav{overflow-x:auto}.module-nav button{white-space:nowrap;flex:1}.top-actions{margin-left:auto}.utility-bar{gap:12px}.module-heading{padding-top:8px}.module-heading h1{font-size:29px}}
@media(max-width:620px){.topbar{padding:14px 18px}.brand{font-size:18px}.top-actions{margin-left:0;width:100%;justify-content:space-between}.top-actions button{font-size:13px;padding:8px}.utility-bar{padding:12px 18px}.utility-bar small{width:100%}.module-nav{padding:12px 10px;gap:2px}.module-nav button{padding:8px;font-size:12px}.module-grid{grid-template-columns:1fr}.hero{padding:20px 0}.module-card .number{font-size:34px;margin-bottom:16px}.module-card .tag{top:20px}.hero h1{font-size:31px}.hero p.lead{font-size:16px}.module-heading{flex-wrap:wrap}.module-heading button{min-height:36px;padding:6px 10px;font-size:13px}.panel{padding:18px}.stepper li{padding:10px 8px;font-size:12px}.step-num{display:none}.chain-stages{grid-template-columns:1fr}.claim{font-size:16px;padding:15px}.button-row{gap:8px}.button-row button{font-size:13px;padding:9px 12px}.result-card{padding:20px}.result-title{flex-wrap:wrap}dialog{padding:22px}.mode-banner{font-size:12px;padding:9px 15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{@page{size:A4;margin:15mm}body{background:white;color:black;font-size:11pt}.topbar,.utility-bar,.mode-banner,.module-nav,footer,dialog,.skip-link,.work-navigation,.export-actions,.module-heading,.stepper,.context-card,.final-editor,#global-message,.print-hide{display:none!important}main,#experiment,#view{max-width:none;margin:0;padding:0}.result-card{border:0;box-shadow:none;margin:0;padding:0;border-radius:0}.result-body{font-size:10.5pt}.result-title{break-after:avoid}.result-body p{orphans:3;widows:3}button{display:none!important}}
/* Compact anonymous group code; avoid splitting the label on narrow flex rows. */
.utility-bar label{white-space:nowrap}.utility-bar #anonymous-code{width:96px;flex-shrink:0}
/* Presentation-only guided view; existing task state is retained. */
[hidden]{display:none!important}
.competition-home{display:block;padding-block:32px}.competition-home h1{font-size:var(--title-size)}
.extension-strip{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-top:28px;padding:20px 24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper)}
.extension-strip h2{font-size:20px;margin:0 0 8px}.extension-strip p{margin-bottom:0}
.classroom-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 20px;scroll-margin-top:20px}
.classroom-toolbar button[aria-pressed="true"]{background:var(--soft);border-color:var(--brand);color:var(--ink)}
.classroom-toolbar p{margin:0}.guided-grid{display:block;max-width:880px;margin-inline:auto}
.guided-grid .chain-stages{display:block}.guided-grid .stage-card{padding:18px 0;border:0}
.guided-facts{margin:16px 0}.guided-facts p,.guided-facts li{font-size:var(--small-size)}
.chain-summary p{padding:10px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}
.use-editor{max-width:880px;margin-inline:auto}.use-item{padding-block:14px;border-bottom:1px solid var(--line);margin-bottom:20px}.use-item textarea{min-height:62px}
@media(max-width:620px){.extension-strip,.classroom-toolbar{flex-direction:column;align-items:stretch;gap:12px}.classroom-toolbar .button-row{display:flex}.classroom-toolbar button{flex:1}.guided-grid .inline-select select{font-size:15px}.guided-grid .stage-card label{font-size:15px}.guided-grid .stage-card textarea{font-size:16px}}
/* Four peer classroom tasks, three agents. */
.module-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.module-card .task-kind{display:block;color:var(--muted);font-size:13px;margin:8px 0 16px}
.method-strip{display:flex;flex-wrap:wrap;gap:8px 22px;padding:14px 24px 14px 40px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);font-size:14px;margin:0 0 22px}
.use-initial{max-width:880px;margin:0 auto 22px}.use-snapshot{white-space:pre-wrap;overflow-wrap:anywhere}
@media(max-width:1050px){.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.module-grid{grid-template-columns:1fr}.module-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:visible}.module-nav button{white-space:normal;text-align:left;min-width:0}.module-nav button span{display:none}.method-strip{font-size:13px}.use-initial{padding:18px}.brand small{font-size:10px}}
/* Review access reuses existing panels and tokens. */
.inquiry-hint{font-size:.95em;border-left:3px solid var(--accent, #0078d4);padding-left:.75rem;margin:.8rem 0 0;}
#review-access-panel .security-note{margin-block:1rem;}