.lab-page{background:var(--paper)}
.lab-top{background:#07111e;border-bottom:1px solid rgba(255,255,255,.09)}
.lab-top-inner{height:64px;display:flex;align-items:center;gap:16px;padding:0 24px}
.lab-name{color:var(--blue);font-weight:800;letter-spacing:.14em;text-transform:uppercase;font-size:12px;border-left:1px solid #2b4357;padding-left:16px}
.lab-back{margin-left:auto;color:#c9d5df;font-size:14px;text-decoration:none}.lab-back:hover{color:#fff}
.lab-shell{display:grid;grid-template-columns:270px minmax(0,1fr);overflow-x:clip;min-height:calc(100vh - 64px)}
.lab-list{background:#fff;border-right:1px solid var(--line);padding:26px 18px;position:sticky;top:0;height:100vh;overflow-y:auto}
.lab-part{font-size:11px;letter-spacing:.14em;text-transform:uppercase;font-weight:800;color:var(--blue2);margin:22px 0 8px}.lab-part:first-child{margin-top:0}
.lab-list nav a{display:block;padding:10px 12px;border-radius:6px;color:var(--ink);text-decoration:none;font-size:14px;line-height:1.35}
.lab-list nav a small{display:block;font:11px var(--mono);color:#7c8994;margin-bottom:2px}
.lab-list nav a:hover{background:#eef5fa}.lab-list nav a.active{background:#0c2234;color:#fff}.lab-list nav a.active small{color:#8fd3ff}
.lab-more{font-size:13px;color:var(--muted);margin-top:22px}.lab-more a{color:var(--blue2)}
.lab-select{display:none}
.lab-main{padding:34px 40px 70px;max-width:1180px;min-width:0}
.lab-kicker{font:12px var(--mono);color:#6b7a87;margin:0 0 8px}
.lab-intro h1{font-size:clamp(32px,4vw,46px);letter-spacing:-.035em;margin-bottom:10px}
.lab-question{font-family:var(--serif);font-size:22px;color:#28455c;margin:0 0 12px}
.lab-text{max-width:820px;color:#44525f;margin:0}
.lab-setup{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;margin:26px 0 8px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:8px}
.lab-controls{display:flex;flex-wrap:wrap;gap:14px 22px}
.lab-control{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.lab-control>span{font-size:13px;font-weight:700;color:#3d4c59}
.lab-seg{display:inline-flex;border:1px solid #b9c9d6;border-radius:6px;overflow:hidden}
.lab-seg button{border:0;background:#fff;padding:8px 12px;font:inherit;font-size:13px;cursor:pointer;color:#2b3a47}
.lab-seg button+button{border-left:1px solid #b9c9d6}.lab-seg button.on{background:#0c2234;color:#fff}
.lab-break{display:flex;align-items:center;gap:10px;font-size:14px;cursor:pointer;color:#5b2a14}
.lab-break input{position:absolute;opacity:0;width:1px;height:1px}
.lab-switch{width:40px;height:22px;border-radius:11px;background:#c9d3db;position:relative;flex:none;transition:.2s}
.lab-switch:after{content:"";position:absolute;width:16px;height:16px;border-radius:50%;background:#fff;top:3px;left:3px;transition:.2s}
.lab-break input:checked+.lab-switch{background:#d9572b}.lab-break input:checked+.lab-switch:after{left:21px}
.lab-break input:focus-visible+.lab-switch{outline:3px solid #167fb9;outline-offset:2px}
.lab-run{margin-left:auto;border:0;cursor:pointer;font-family:inherit}
.lab-status{min-height:22px;font-size:14px;color:var(--muted);margin:4px 0 14px}
.lab-transport{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.lab-transport button{width:38px;height:36px;border:1px solid #b9c9d6;background:#fff;border-radius:6px;cursor:pointer;font-size:14px;color:#0c2234}
.lab-transport button:hover{background:#eef5fa}
.lab-transport input[type=range]{flex:1;min-width:140px;accent-color:#1a83c6}
.lab-counter{font:12px var(--mono);color:#53616e;min-width:92px;text-align:right}
.lab-transport select{border:1px solid #b9c9d6;border-radius:6px;padding:7px;font:inherit;font-size:13px;background:#fff}
.lab-stage{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:16px}
.lab-diagram{position:relative;display:grid;grid-template-columns:1fr 34px 1fr 34px 1fr 34px 1fr;align-items:center;padding:46px 18px 56px;background:#07111e;border-radius:10px;min-height:250px}
.lab-loop{position:absolute;left:calc(25% - 4px);right:10px;top:16px;bottom:16px;border:1px dashed #33536b;border-radius:10px;pointer-events:none}
.lab-loop span{position:absolute;top:-9px;left:14px;background:#07111e;padding:0 8px;font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:#6f8ba1}
.node{position:relative;z-index:1;background:#0f2436;border:1px solid #2b4a62;border-radius:8px;padding:12px 10px;min-height:118px;color:#dce8f1;transition:.25s}
.node b{display:block;font-size:15px}.node small{display:block;font-size:11px;color:#86a0b4;margin-bottom:8px}
.node em{display:block;font:11px/1.45 var(--mono);font-style:normal;color:#a9c3d6;word-break:break-word;max-height:80px;overflow:hidden}
.node.active{border-color:#62c8ff;box-shadow:0 0 0 3px rgba(98,200,255,.25),0 10px 30px rgba(0,0,0,.35);transform:translateY(-3px);background:#12314a}
.node.active[data-role=model]{border-color:#ffbf64;box-shadow:0 0 0 3px rgba(255,191,100,.25),0 10px 30px rgba(0,0,0,.35)}
.node.fail{border-color:#ff7a59;box-shadow:0 0 0 3px rgba(255,122,89,.3)}
.arrow{height:2px;background:#2b4a62;position:relative}
.arrow:after{content:"";position:absolute;right:-1px;top:-4px;border:5px solid transparent;border-left-color:#2b4a62;border-right:0}
.arrow.on{background:#62c8ff}.arrow.on:after{border-left-color:#62c8ff}
.arrow.back:after{right:auto;left:-1px;border-left:0;border-right:5px solid #62c8ff}
.lab-tally{position:absolute;left:18px;right:18px;bottom:14px;font:11px var(--mono);color:#86a0b4;text-align:right}
.lab-caption{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 22px}
.lab-step-kind{font-size:11px;letter-spacing:.14em;text-transform:uppercase;font-weight:800;color:var(--blue2);margin:0 0 8px}
.lab-caption #caption{font-size:18px;line-height:1.5;margin:0;color:#14222f}
.lab-note{font-family:var(--serif);font-size:16px;color:#5a4a1e;background:#fff7e8;border-left:3px solid var(--gold);padding:10px 12px;margin:14px 0 0}
.lab-note:empty{display:none}
.lab-panels{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.panel{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 18px;min-width:0}
.panel h2,.lab-lesson h2{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:#53616e;margin:0 0 12px}
.lab-context{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.lab-context li{border-radius:8px;padding:8px 10px;font-size:14px;border:1px solid var(--line);word-break:break-word}
.lab-context li b{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:2px}
.lab-context li.user{background:#eef7fc}.lab-context li.user b{color:#1a83c6}
.lab-context li.tool{background:#eefaf0}.lab-context li.tool b{color:#2e8a43}
.lab-context li.assistant{background:#fff7e8}.lab-context li.assistant b{color:#a86a10}
.lab-context .empty{color:var(--muted);border-style:dashed}
.lab-output{margin:0;min-height:60px;max-height:260px;overflow:auto;background:#07111e;color:#cfe0eb;border-radius:8px;padding:12px 14px;font:13px/1.6 var(--mono);white-space:pre-wrap}
.lab-lesson{margin-top:16px;background:#0c2234;color:#e4eef5;border-radius:10px;padding:20px 24px}
.lab-lesson h2{color:#8fd3ff}.lab-lesson p{margin:0;font-family:var(--serif);font-size:18px}
.lab-break-explain{margin-top:12px!important;color:#ffc9b5}.lab-break-explain:empty{display:none}
.lab-code{margin-top:16px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px}
.lab-code summary{cursor:pointer;font-weight:700;color:#1a5f8c}
.lab-code p{font-size:13px;color:var(--muted)}
.lab-code pre{margin:0;max-height:440px;overflow:auto;background:#07111e;color:#cfe0eb;border-radius:8px;padding:10px 0;font:12.5px/1.6 var(--mono)}
.lab-code .ln{display:block;padding:0 14px;white-space:pre}.lab-code .ln i{display:inline-block;width:34px;color:#4f6577;font-style:normal;user-select:none}
.lab-code .ln.hot{background:rgba(255,191,100,.18);box-shadow:inset 3px 0 #ffbf64}
@media(max-width:1000px){.lab-stage{grid-template-columns:1fr}}
@media(max-width:820px){
  .lab-shell{grid-template-columns:minmax(0,1fr)}.lab-list{border-right:0;border-bottom:1px solid var(--line);padding:14px 16px;position:static;height:auto}
  .lab-list nav,.lab-more{display:none}.lab-select{display:block;width:100%;padding:10px;border:1px solid #b9c9d6;border-radius:6px;font:inherit;background:#fff}
  .lab-main{padding:22px 16px 50px}.lab-panels{grid-template-columns:1fr}.lab-run{margin-left:0;width:100%}
  .lab-diagram{grid-template-columns:1fr;gap:0;padding:30px 14px 46px}.arrow{width:2px;height:18px;margin:0 auto}
  .arrow:after{right:-4px;top:auto;bottom:-1px;border:5px solid transparent;border-top-color:inherit;border-bottom:0}
  .arrow:after{border-top-color:#2b4a62}.arrow.on:after{border-top-color:#62c8ff}
  .arrow.back:after{bottom:auto;top:-1px;left:-4px;border:5px solid transparent;border-bottom:5px solid #62c8ff;border-top:0}
  .lab-loop{left:6px;right:6px;top:150px}.node{min-height:0}
  .lab-top-inner{padding:0 16px}.lab-top .brand span:last-child{display:none}
}
.lab-panels.solo{grid-template-columns:1fr}
.node b{overflow-wrap:break-word;hyphens:auto}
.lab-diagram.many{padding-left:10px;padding-right:10px}.lab-diagram.many .node{padding:10px 8px}.lab-diagram.many .node b{font-size:13px}.lab-diagram.many .node small{font-size:10px}
.lab-video{display:inline-flex;align-items:center;gap:10px;margin-top:14px;padding:9px 14px 9px 10px;border:1px solid #f1c3c3;border-radius:6px;background:#fff;color:#a3221b;font-size:14px;font-weight:700;text-decoration:none}.lab-video[hidden]{display:none}.lab-video span:first-child{display:grid;place-items:center;width:26px;height:20px;border-radius:5px;background:#e62117;color:#fff;font-size:10px}.lab-video:hover{background:#fff5f5}