:root{color-scheme:light;--bg:oklch(1 0 0);--surface:oklch(.978 .003 140);--ink:oklch(.25 .018 140);--muted:oklch(.49 .016 140);--line:oklch(.9 .01 140);--primary:oklch(.43 .08 140);--primary-soft:oklch(.95 .025 140);--accent:oklch(.62 .18 32);--red:oklch(.56 .19 25);--blue:oklch(.5 .17 255);--radius:8px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid oklch(.65 .12 140);outline-offset:3px}button{color:inherit}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,p{margin:0}h1,h2,h3{text-wrap:balance}p{text-wrap:pretty}button{transition:background .16s ease-out,color .16s ease-out}button:hover{background:var(--primary-soft)}[hidden]{display:none!important}
.topbar{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 34px;gap:20px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}.brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--primary);color:white;font-size:34px;line-height:1;overflow:hidden}.brand strong{font-size:23px;letter-spacing:.06em}.brand-detail{color:var(--muted);font-size:14px;margin-left:5px;padding-left:17px;border-left:1px solid var(--line)}.top-right{display:flex;align-items:center;gap:26px}.course{color:var(--muted);font-size:12px}.text-button{padding:5px 0;border:0;background:transparent;color:var(--primary);font-size:12px}.text-button:hover{text-decoration:underline;background:transparent}.text-button span{margin-left:7px}
.workspace{display:grid;grid-template-columns:226px minmax(440px,1fr) 270px;max-width:1700px;margin:auto;min-height:calc(100vh - 125px)}.library{border-right:1px solid var(--line);padding:32px 18px 20px 26px;display:flex;flex-direction:column}.library-heading h1{font-size:20px;line-height:1.6;font-weight:650;letter-spacing:.02em}.library-heading p{font-size:12px;color:var(--muted);margin-top:8px}.search{display:flex;align-items:center;border:1px solid var(--line);border-radius:6px;margin-top:26px;padding:7px 8px;gap:6px;background:var(--bg)}.search>span{font-size:23px;color:var(--muted);line-height:20px}.search input{min-width:0;width:100%;border:0;outline:none;font-size:12px;background:transparent;color:var(--ink)}.search input::placeholder{color:var(--muted);opacity:1}.search kbd{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:1px 4px}.model-group{margin-top:23px}.model-group h3{font-size:11px;font-weight:500;color:var(--muted);margin:0 0 8px 10px}.model-button{border:0;background:transparent;width:100%;display:flex;gap:10px;align-items:center;text-align:left;padding:9px 10px;border-radius:6px;font-size:13px;margin:2px 0;min-height:36px}.model-icon{width:20px;text-align:center;font-family:Georgia,serif;font-size:18px;line-height:1;color:var(--muted)}.model-button.active{background:var(--primary-soft);color:var(--primary);font-weight:650}.model-button.active .model-icon{color:var(--primary)}.model-button.active::after{content:"";width:5px;height:5px;border-radius:50%;background:var(--primary);margin-left:auto}.library-foot{font-size:11px;line-height:1.9;color:var(--muted);margin-top:auto;padding:28px 10px 0}.library-foot span{font-size:10px}.empty-search{color:var(--muted);font-size:12px;line-height:1.8;padding:20px 10px}
.experiment{padding:30px 28px 20px;min-width:0}.experiment-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.chapter-label{font-size:11px;color:var(--primary);margin-bottom:8px}.experiment-heading h2{font-size:25px;font-weight:650;letter-spacing:.01em}.subtitle{font-size:12px;color:var(--muted);margin-top:9px;line-height:1.7}.button{background:var(--primary);color:var(--bg);border:1px solid var(--primary);padding:9px 13px;border-radius:6px;font-size:12px;white-space:nowrap;min-height:36px}.button:hover{background:oklch(.35 .08 140)}.button.secondary{background:var(--bg);color:var(--ink);border-color:var(--line)}.button.secondary:hover{background:var(--surface)}.button.secondary span{margin-right:6px;font-size:16px}.button.compact{padding:5px 11px;min-height:32px}.stage{height:clamp(400px,51vh,680px);min-height:400px;background:var(--surface);border:1px solid var(--line);border-radius:10px;position:relative;overflow:hidden}.stage:fullscreen{height:100vh;border:0;border-radius:0}.stage:fullscreen #canvas-host{height:100vh}#canvas-host{width:100%;height:100%;touch-action:none}#canvas-host canvas{display:block;width:100%;height:100%}.stage-top{position:absolute;top:17px;left:18px;right:18px;display:flex;justify-content:space-between;pointer-events:none;gap:10px}.model-tag{font-size:10px;color:var(--muted);border:1px solid var(--line);background:var(--bg);border-radius:4px;padding:5px 7px;align-self:start}.legend{display:flex;gap:12px;align-items:start;font-size:10px;flex-wrap:wrap}.legend span{display:flex;align-items:center;gap:5px;background:oklch(1 0 0 / .9);padding:4px;border-radius:3px}.legend i{width:15px;height:2px;background:var(--red)}.legend i.blue{background:var(--blue)}.stage-tools{position:absolute;right:14px;top:65px;display:flex;flex-direction:column;gap:7px}.icon-button{height:31px;width:31px;background:var(--bg);border:1px solid var(--line);border-radius:5px;display:grid;place-items:center;font-size:20px}.stage-bottom{position:absolute;bottom:14px;left:18px;right:14px;display:flex;align-items:center;justify-content:space-between;gap:10px}.drag-hint{font-size:10px;color:var(--muted);background:oklch(1 0 0 / .88);border-radius:4px;padding:4px 6px}.view-switch{display:flex;padding:3px;gap:2px;border:1px solid var(--line);border-radius:6px;background:var(--bg)}.view-switch button{border:0;background:transparent;color:var(--muted);border-radius:4px;padding:5px 9px;font-size:11px}.view-switch button.active{background:var(--primary-soft);color:var(--primary);font-weight:600}.display-bar{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:15px 1px;border-bottom:1px solid var(--line);font-size:11px;color:var(--muted)}.display-checks{display:flex;gap:17px;flex-wrap:wrap}.display-bar label{display:flex;align-items:center;gap:4px;cursor:pointer}input[type=checkbox]{accent-color:var(--primary);width:13px;height:13px;cursor:pointer}input[type=range]{accent-color:var(--primary);width:100%;cursor:pointer}.playback{display:flex;align-items:center;gap:18px;padding:14px 0;border-bottom:1px solid var(--line);font-size:11px}.playback label{display:flex;align-items:center;gap:9px}.playback input{width:85px}.playback>span{color:var(--muted);margin-left:auto;font-size:10px}
.explanation{display:grid;grid-template-columns:145px 1fr;padding:26px 0;gap:18px}.explanation-title{display:flex;align-items:start;gap:8px;padding-top:2px}.small-symbol{color:var(--primary);font-size:20px;line-height:18px}.explanation h3{font-size:13px;font-weight:650}.explanation-body{min-width:0}.explanation-body>p:first-child{font-size:13px;line-height:1.9;max-width:70ch}.formula{font:13px/1.8 ui-monospace,"SFMono-Regular",Consolas,monospace;letter-spacing:0;margin:14px 0 10px;padding:10px 13px;background:var(--surface);border-radius:5px;overflow-wrap:anywhere}.model-note{font-size:11px;color:var(--muted);line-height:1.8}.explanation a{display:inline-block;font-size:11px;margin-top:10px}.resources{border-top:1px solid var(--line);padding:16px 0 5px}.resources>summary{list-style:none;font-size:12px;cursor:pointer;display:flex;justify-content:space-between;color:var(--muted)}.resources>summary::-webkit-details-marker{display:none}.resource-links{display:flex;gap:28px;margin:20px 0 12px;flex-wrap:wrap}.resource-links a{display:flex;flex-direction:column;gap:5px}.resource-links strong{font-size:12px;font-weight:600}.resource-links span,.resources>p{font-size:10px;color:var(--muted);line-height:1.7}.help-panel{background:var(--primary-soft);padding:20px;margin-bottom:20px;border-radius:8px;display:flex;gap:22px}.help-panel>div{flex:1}.help-panel strong{font-size:12px}.help-panel p{font-size:11px;line-height:1.9;margin-top:8px}.render-error{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;background:var(--surface);padding:40px}.render-error p{font-size:13px;line-height:1.8;max-width:36ch;margin:18px 0}
.inspector{border-left:1px solid var(--line);padding:32px 23px 20px;background:var(--bg);min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-heading h3{font-size:14px;font-weight:650}.panel-hint{font-size:11px;line-height:1.8;color:var(--muted);margin-top:8px}.parameter{margin-top:23px}.parameter label{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;margin-bottom:10px}.parameter output{font:12px ui-monospace,"SFMono-Regular",Consolas,monospace;color:var(--primary)}.parameter .range-endpoints{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);margin-top:4px}.parameter select{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:5px;color:var(--ink);padding:7px 9px;font-size:12px}.probe-section{margin-top:30px;padding-top:26px;border-top:1px solid var(--line)}.probe-dot{border:2px solid var(--primary);width:10px;height:10px;border-radius:50%}.probe-inputs{display:flex;gap:8px;margin-top:18px}.probe-inputs label{width:calc(100% / 3);font-size:11px;color:var(--muted)}.probe-inputs input{width:100%;margin-top:6px;background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:7px 5px;color:var(--ink);font:12px ui-monospace,"SFMono-Regular",Consolas,monospace}.probe-readout{background:var(--surface);padding:13px;margin-top:14px;border-radius:6px}.probe-readout>span{display:block;font-size:10px;color:var(--muted)}.probe-readout strong{font:21px/1.5 ui-monospace,"SFMono-Regular",Consolas,monospace;display:block;margin-top:4px}.probe-readout p{font:10px/1.8 ui-monospace,"SFMono-Regular",Consolas,monospace;overflow-wrap:anywhere;color:var(--muted)}.probe-note{font-size:10px;line-height:1.8;color:var(--muted);margin-top:9px}.experiment-idea{margin-top:28px;padding:18px 0;border-top:1px solid var(--line)}.experiment-idea>span{color:var(--primary);font-size:19px;float:left;margin-right:8px;line-height:19px}.experiment-idea h3{font-size:12px;font-weight:600}.experiment-idea p{font-size:12px;line-height:1.9;color:var(--muted);margin-top:10px}.copy-link{margin-top:7px}#custom-editor>label{display:block;font-size:11px;margin-top:13px}#custom-editor input{width:100%;display:block;background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:8px;font:12px ui-monospace,monospace;color:var(--ink);margin-top:5px}.custom-presets{display:flex;gap:5px;margin:12px 0}.custom-presets button{font-size:10px;padding:5px;background:var(--bg);border:1px solid var(--line);border-radius:4px}#custom-editor>.button{width:100%}#custom-editor details{margin-top:12px;font-size:10px;color:var(--muted);line-height:1.9}#custom-editor details summary{cursor:pointer}#custom-editor details p{margin-top:8px}#formula-error{color:var(--red);font-size:11px;line-height:1.8;margin-top:9px}.guide-status{font-size:11px;line-height:1.9;margin-top:20px;padding:11px;background:var(--primary-soft);border-radius:5px}.guide-status.warning{background:oklch(.97 .025 75);color:oklch(.4 .09 65)}footer{border-top:1px solid var(--line);padding:17px 33px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:10px;line-height:1.8}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,15px);background:var(--ink);color:var(--bg);padding:11px 18px;border-radius:6px;font-size:12px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:20;max-width:90vw}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(min-width:1500px){.workspace{grid-template-columns:245px minmax(440px,1fr) 292px}.experiment{padding:34px 38px}.inspector{padding:36px 28px}.library{padding-left:33px}}
@media(max-width:1150px){.workspace{grid-template-columns:195px minmax(0,1fr) 235px}.library{padding-left:17px;padding-right:12px}.library-heading h1{font-size:18px}.experiment{padding:26px 20px}.inspector{padding:29px 17px}.explanation{grid-template-columns:1fr;gap:13px}.experiment-heading h2{font-size:22px}.display-checks{gap:10px}.brand-detail{display:none}.stage{min-height:390px}.playback{gap:10px}.playback>span{display:none}}
@media(max-width:980px){.workspace{grid-template-columns:195px minmax(0,1fr)}.inspector{grid-column:2;border-top:1px solid var(--line);border-left:0;display:grid;grid-template-columns:1fr 1fr;gap:28px;padding:25px}.probe-section{margin:0;padding:0;border:0}.experiment-idea{grid-column:1 / -1;margin:0;padding:18px 0 0}.copy-link{justify-self:start;margin:0}.library{grid-row:1 / 3}.stage{height:460px}.parameter{margin-top:18px}.experiment-idea p{margin-top:8px}.topbar{padding:0 24px;height:65px}}
@media(max-width:700px){.topbar{padding:0 17px;height:60px}.brand strong{font-size:20px}.brand-mark{width:30px;height:30px}.course{display:none}.workspace{display:block}.library{padding:18px 17px 0;border:0;border-bottom:1px solid var(--line)}.library-heading{display:none}.search{margin:0 0 12px;padding:5px 9px}#model-list{display:flex;gap:15px;overflow-x:auto;margin:0 -17px;padding:0 17px 12px;align-items:start}.model-group{margin:0;flex-shrink:0}.model-group h3{font-size:10px;margin:0 0 5px 6px}.model-group>div{display:flex;gap:4px}.model-button{width:auto;white-space:nowrap;padding:7px 9px;font-size:12px;border:1px solid var(--line);margin:0}.model-button.active::after{display:none}.model-icon{font-size:15px;width:16px}.library-foot{display:none}.experiment{padding:22px 16px 14px}.experiment-heading{margin-bottom:16px;align-items:center}.experiment-heading h2{font-size:22px}.subtitle{font-size:11px}.chapter-label{font-size:10px;margin-bottom:6px}.experiment-heading .secondary{font-size:11px;padding:7px 10px}.stage{height:420px;min-height:350px}.stage-top{left:12px;right:12px;top:12px}.stage-bottom{left:10px;right:10px;bottom:10px}.drag-hint{font-size:9px}.view-switch button{font-size:10px;padding:5px 7px}.legend{gap:5px;font-size:9px}.display-bar{font-size:10px;gap:6px}.display-checks{gap:7px}.display-bar input{width:12px;height:12px}.explanation{padding:22px 0}.explanation-body>p:first-child{font-size:12px}.help-panel{flex-direction:column;padding:16px;gap:16px}.inspector{padding:23px 17px;gap:23px 18px}.parameter label{font-size:11px}.panel-heading h3{font-size:13px}.parameter output{font-size:11px}.probe-inputs{gap:5px}.probe-readout{padding:10px}.probe-readout strong{font-size:18px}.resources>summary{font-size:11px}footer{padding:14px 17px;flex-wrap:wrap;gap:4px;font-size:9px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}