:root{--ink:#213b45;--muted:#778b91;--accent:#197e70;--line:#dce5e6;--paper:#f6f9f8}*{box-sizing:border-box}body{margin:0;font:13px/1.5 system-ui,-apple-system,'Segoe UI',sans-serif;color:var(--ink);background:#edf2f1}button,input,select{font:inherit}button{border:1px solid var(--line);border-radius:7px;padding:9px 12px;background:white;color:var(--ink);cursor:pointer;transition:background .15s}button:hover{background:#edf4f1}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--accent);color:white;border-color:var(--accent)}button.primary:hover{background:#12685d}.wide{width:100%;margin-top:14px}.two{display:grid;grid-template-columns:1fr 1fr;gap:10px}.three{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}header{height:72px;background:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center}.brand b{font-size:19px}.brand small{display:block;font-size:10px;letter-spacing:1px;color:var(--muted)}.brandMark{font-size:36px;line-height:1;color:var(--accent)}.projectName{font-size:14px}.projectName span{font-size:10px;background:#eff4f2;color:var(--muted);padding:4px 8px;border-radius:20px;margin-left:10px}.headerActions{display:flex;gap:8px}#steps{height:64px;background:#fff;display:flex;align-items:center;justify-content:center;gap:20px;border-bottom:1px solid var(--line)}#steps button{border:0;color:var(--muted);background:transparent;padding:8px 12px}#steps button.active{color:var(--accent);background:#edf5f1}#steps em{display:inline-grid;place-items:center;width:22px;height:22px;border:1px solid #b6cac5;border-radius:50%;font:11px system-ui;margin-right:8px}#steps .active em{background:var(--accent);border-color:var(--accent);color:white}#steps i{font:20px serif;color:#c1cfcc}main{display:grid;grid-template-columns:230px minmax(260px,1fr) 365px;height:calc(100dvh - 136px)}aside{background:#fff;overflow:auto;min-width:0}.left{border-right:1px solid var(--line);position:relative;display:flex;flex-direction:column}.right{border-left:1px solid var(--line);padding:24px}.right section[hidden]{display:none}.panelHead{display:flex;align-items:center;justify-content:space-between;padding:18px 14px}.panelHead h2{font-size:13px}.panelHead button{font-size:11px;padding:6px 8px}.treeRoot{padding:12px 18px;background:#f4f8f6;font-weight:600;border-block:1px solid #edf2f0}.treeItem{display:block;width:100%;text-align:left;border:0;border-radius:0;padding:10px 14px 10px 26px;background:transparent}.treeItem.active{background:#e9f4ee;color:#176d5a;border-right:3px solid #228570}.treeItem small{display:block;margin-left:18px;color:var(--muted);font-size:10px}.treeHint{padding:20px;font-size:11px;color:var(--muted);line-height:1.9}.leftFoot{margin-top:auto;padding:18px;background:#f9fbfa;border-top:1px solid var(--line);font-size:11px}.leftFoot small{display:block;color:var(--muted);margin-top:4px}h2{font-size:20px;margin:5px 0 12px}h3{font-size:13px;margin:18px 0 12px}.eyebrow{font-size:10px;color:var(--accent);letter-spacing:1.8px;font-weight:600}.intro{color:var(--muted);font-size:12px;line-height:1.9;margin-bottom:20px}.note{display:block;color:var(--muted);font-size:10px;line-height:1.8;margin:9px 0 14px}.sectionHead{display:flex;align-items:center;justify-content:space-between;margin-top:16px}.sectionHead button{font-size:10px;padding:6px 8px}.sectionHead h3{margin:8px 0}input:not([type=checkbox]):not([type=range]),select{width:100%;padding:9px 10px;border:1px solid var(--line);background:#fbfcfc;border-radius:6px;color:var(--ink);outline:none}input:focus,select:focus{border-color:var(--accent)!important}label{display:block;font-size:11px;margin:12px 0}label input,label select{display:block;margin-top:5px}input[type=color]{height:37px;padding:3px!important}input[type=range]{width:100%;accent-color:var(--accent)}.assetCard{display:grid;grid-template-columns:50px 1fr 58px;gap:12px;align-items:center;padding:14px 0;border-bottom:1px solid #edf1f0}.assetCard input[type=checkbox]{accent-color:var(--accent)}.assetThumb{width:50px;height:50px;border-radius:9px;display:grid;place-items:center;overflow:hidden;background:#edf3f0;font-size:25px}.assetCard b{font-size:12px}.assetCard small{display:block;color:var(--muted);font-size:10px}.assetCard label{margin:0;display:flex;gap:8px;align-items:center}.assetCard button{font-size:10px;padding:5px 7px;margin-top:6px}.assetCard input[type=number]{font-size:12px;padding:6px!important}.stickyAction{position:sticky;bottom:-24px;background:#fffffff5;padding:16px 0 4px;display:flex;flex-direction:column;gap:8px;font-size:11px;color:var(--muted)}.basketRow{padding:12px;border:1px solid var(--line);border-radius:7px;display:flex;justify-content:space-between;margin:8px 0}.empty{padding:24px;background:#f5f8f6;color:var(--muted);line-height:1.8}fieldset{border:0;padding:0;margin:0;min-width:0}details{border-bottom:1px solid var(--line);padding-bottom:16px}summary{cursor:pointer;font-weight:600;padding:6px 0}.partButton{display:flex;width:100%;justify-content:space-between;border:0;background:#f7f9f8;border-radius:5px;margin:5px 0;text-align:left;padding:8px 10px;font-size:11px}.partButton.selected{background:#fff1d7;box-shadow:inset 3px 0 #e4a337}.partButton small{color:var(--muted)}#positionEditor{padding:12px;background:#f5f8f6;margin-top:10px;border-radius:7px}.connectBox{padding-bottom:18px;border-bottom:1px solid var(--line)}.connectBox .primary{width:100%}.subtle{font-size:11px;color:var(--accent);background:#eff7f1;width:100%;margin-top:8px}.relationRow{display:flex;gap:5px;margin:7px 0;align-items:stretch}.relationRow .selectRelation{flex:1;min-width:0;text-align:left;font-size:11px;background:#f7faf8}.relationRow .removeRelation{font-size:11px;color:#ac6253}.relationRow small{display:block;color:var(--muted);font-size:10px}#viewport{position:relative;overflow:hidden;min-height:440px}#viewport canvas{display:block;touch-action:none}#viewLabel{position:absolute;left:24px;top:24px;pointer-events:none;background:#fffffff0;border-radius:8px;padding:10px 14px;box-shadow:0 3px 14px #243c4710}#viewLabel small{display:block;font-size:10px;color:var(--muted);margin-top:4px}.dot{display:inline-block;width:6px;height:6px;background:var(--accent);border-radius:50%;margin-right:8px}#viewTools{position:absolute;right:16px;top:24px;display:flex;gap:5px}#viewTools button{font-size:10px;background:#ffffffdb}#viewBottom{position:absolute;bottom:0;left:0;right:0;padding:12px 20px;background:#ffffffd9;display:flex;justify-content:space-between;gap:12px;font-size:10px;color:#6f8389}#selectionInfo{position:absolute;bottom:55px;left:22px;max-width:calc(100% - 44px);background:#fff7e1;border-left:3px solid #e4a337;padding:12px 18px;font-size:12px;pointer-events:none}#drivePad{position:absolute;right:18px;bottom:55px;display:flex;gap:5px}#drivePad button{touch-action:none;background:#fff;font-size:11px}.helpCard{padding:15px;background:#f2f7f4;border-radius:7px;margin:20px 0;font-size:11px}.helpCard p{color:var(--muted);line-height:1.8}.oldDemo{display:block;text-align:center;color:var(--accent);font-size:11px;margin-top:20px}#simulationSummary{padding:14px;background:#f5f8f6;font-size:12px;line-height:2;border-radius:7px}#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);z-index:20;background:#203f36;color:#fff;padding:12px 22px;border-radius:9px;box-shadow:0 4px 30px #122a2422;max-width:90vw;font-size:12px;pointer-events:none;opacity:0;transition:opacity .15s}#toast.visible{opacity:1}dialog{border:0;border-radius:16px;width:820px;max-width:95vw;padding:24px;color:var(--ink);box-shadow:0 25px 100px #152c3940}dialog::backdrop{background:#183b4259;backdrop-filter:blur(4px)}.modalHead{display:flex;justify-content:space-between;align-items:center}.modalHead h2{margin-top:6px}.modalHead button{border:0;font-size:18px}.modelBody{display:grid;grid-template-columns:1fr 1fr;gap:28px}#modelPreview{min-height:350px;background:#edf4ef;border-radius:12px;overflow:hidden}#modelForm label{margin:9px 0}#modelForm .note{font-size:10px}body.modeling #viewport{filter:saturate(.7)}@media(max-width:1150px){main{grid-template-columns:175px minmax(240px,1fr) 325px}.right{padding:18px}#steps{gap:6px}#viewTools{top:90px}#viewBottom span:last-child{display:none}.panelHead{padding:16px 10px;flex-wrap:wrap;gap:6px}}@media(max-width:800px){header{padding:0 12px;height:64px}.projectName{display:none}.brand b{font-size:16px}.headerActions button{font-size:11px;padding:7px}#steps{height:auto;min-height:58px;gap:0;justify-content:space-around;padding:6px}#steps button{font-size:10px;padding:6px}#steps em{display:block;margin:0 auto 3px;width:18px;height:18px}#steps i{display:none}main{height:auto;display:flex;flex-wrap:wrap}.left{width:100%;max-height:160px;order:2}.leftFoot,.treeHint{display:none}.left .panelHead{padding:8px 12px}.left .panelHead h2{margin:0}.treeRoot{display:none}#sceneTree{display:flex;flex-wrap:wrap}.treeItem{width:auto;border-radius:0;padding:8px 14px}.treeItem small{margin:0}.right{width:100%;order:3;border-left:0;padding:20px}#viewport{width:100%;height:49dvh;min-height:330px;order:1}#viewLabel{top:12px;left:12px;font-size:11px}#viewTools{right:10px;top:12px;flex-direction:column}#viewTools button{padding:5px;font-size:9px}#viewLabel small{max-width:150px}#viewBottom{font-size:9px;padding:9px 12px}.modelBody{grid-template-columns:1fr;gap:12px}#modelPreview{min-height:190px;height:190px}dialog{padding:16px;max-height:92dvh}.stickyAction{bottom:-20px}}
[hidden]{display:none!important}#objectInspector{padding-bottom:18px;margin-bottom:24px;border-bottom:1px solid var(--line)}

/* Compact workbench: reserve vertical space for the scene and its properties. */
body{overflow:hidden}
header{height:48px;padding:0 16px;gap:18px}
.brand{gap:8px;flex-shrink:0}
.brand b{font-size:16px;white-space:nowrap}
.brandMark{font-size:26px}
.headerActions{flex-shrink:0;gap:6px}
.headerActions button{font-size:11px;padding:6px 10px}
#steps{height:100%;min-height:0;flex:1;gap:6px;border:0;padding:0;background:transparent}
#steps button{height:30px;padding:4px 12px;display:flex;align-items:center;gap:7px;font-size:12px;white-space:nowrap}
#steps em{width:17px;height:17px;font-size:10px;margin:0;flex-shrink:0}
main{height:calc(100dvh - 48px);grid-template-columns:210px minmax(260px,1fr) 350px;min-height:0}
.right{padding:16px}
.right h2{font-size:17px;margin:0 0 9px}
.right .eyebrow{display:none}
.intro{font-size:11px;line-height:1.7;margin:0 0 12px}
.right h3{margin:13px 0 9px}
.right label{margin:8px 0}
button{padding:7px 10px}
input:not([type=checkbox]):not([type=range]),select{padding:7px 9px}
.note{font-size:10px;line-height:1.6;margin:7px 0 10px}
.panelHead{padding:12px}
.panelHead h2{margin:0;font-size:12px}
.panelHead button{padding:5px 7px}
.treeRoot{padding:9px 14px;font-size:12px}
.treeItem{padding:9px 12px 9px 20px;font-size:12px}
.treeHint{padding:14px;font-size:10px;line-height:1.7}
.leftFoot{padding:12px;font-size:10px}
.sectionHead{margin-top:12px}
.sectionHead h3{margin:6px 0}
.assetCard{padding:10px 0;grid-template-columns:40px 1fr 54px;gap:10px}
.assetThumb{width:40px;height:40px;border-radius:7px;font-size:22px}
.assetCard input[type=number]{padding:5px!important}
.assetCard button{padding:3px 6px;margin-top:4px}
.stickyAction{bottom:-16px;padding:10px 0 0;gap:6px}
.stickyAction .primary{min-height:34px}
.connectBox{padding-bottom:12px}
details{padding-bottom:10px}
#positionEditor{padding:10px}
.wide{margin-top:10px}
#objectInspector{padding-bottom:12px;margin-bottom:16px}
#objectInspector h3{margin:0 0 7px;font-size:13px}
#objectInspector .note{margin-bottom:0}
#viewLabel{top:12px;left:12px;padding:7px 10px;font-size:11px;border-radius:6px;box-shadow:0 2px 8px #243c4708}
#viewLabel small{display:none}
#viewTools{top:12px;right:12px;gap:5px;flex-direction:row}
#viewTools button{padding:6px 8px;font-size:10px}
#viewBottom{padding:8px 12px;font-size:10px;min-height:30px}



#selectionInfo{bottom:44px;left:14px;padding:9px 12px;font-size:11px}
#drivePad{bottom:44px}

@media(min-width:801px) and (max-width:1150px){
 main{grid-template-columns:165px minmax(260px,1fr) 315px}
 header{gap:10px;padding:0 12px}
 #steps{gap:2px}
 #steps button{padding:4px 8px;font-size:11px}
 .right{padding:14px}
 .panelHead{padding:10px;gap:5px}
 .stickyAction{bottom:-14px}
}
@media(min-width:801px){#viewport{min-height:0}}
@media(max-width:800px){
 body{overflow:auto}
 header{height:80px;padding:0 12px;gap:0;flex-wrap:wrap;align-content:start;justify-content:space-between}
 .brand,.headerActions{height:44px;align-items:center}
 .brand b{font-size:15px}
 .headerActions button{font-size:10px;padding:5px 8px}
 #steps{order:3;flex:0 0 100%;height:36px;gap:0;justify-content:space-between;align-items:center}
 #steps button{height:28px;font-size:10px;padding:4px 7px;gap:5px}
 #steps em{display:inline-grid;width:16px;height:16px;margin:0;font-size:9px}
 main{height:auto;display:flex}
 #viewport{height:52dvh;min-height:320px}
 .right{padding:16px}
 .left{max-height:145px}
 .treeItem{padding:7px 12px}
 #viewTools{top:12px;right:10px;flex-direction:row}
 #viewTools button{padding:5px 6px;font-size:9px}
 
 .stickyAction{bottom:-16px}
}
@media(max-width:360px){
 #steps button{padding:4px;font-size:9px;gap:3px}
 .brand b{font-size:14px}
 .headerActions button{padding:5px 6px}
}
.assetThumb img{display:block;width:100%;height:100%;object-fit:contain}.libraryFilters{display:grid;grid-template-columns:104px minmax(0,1fr);gap:6px}.libraryFilters select{font-size:11px}.sectionHead{gap:6px}.sectionHead h3{margin-right:auto}.sectionHead button{white-space:nowrap;padding:5px 7px;font-size:10px}
.jointTypeCards{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin:10px 0}
.jointTypeCard{min-width:0;padding:6px 8px;text-align:left;background:#f8faf9;border:1px solid #e1e9e5}
.jointTypeCard[aria-pressed=true]{border-color:#218674;background:#eaf5ef;box-shadow:inset 0 0 0 1px #218674}
.jointTypeCard svg{display:block;width:100%;height:65px;overflow:visible}
.jointTypeCard b{font-size:12px;display:block}.jointTypeCard small{display:block;font-size:9px;color:#738b8c;line-height:1.5;min-height:27px}
.jointTypeHelp{font-size:11px;background:#f1f6f3;padding:10px;border-radius:6px;color:#53706d;line-height:1.7}
.jointSettings{margin:10px 0;font-size:11px}#driveDiagram svg{width:100%;height:52px;display:block}
#drivePad{flex-wrap:wrap;max-width:calc(100% - 30px)}
.exampleTemplates{margin:10px 0 12px;padding:9px 10px;background:#f5f8f6;border:1px solid #e6ece8;border-radius:6px;font-size:11px}
.exampleTemplates summary{padding:0;font-weight:400;color:#55736b}.exampleButtons{display:flex;gap:6px;margin-top:10px}.exampleButtons button{font-size:10px;padding:6px;flex:1}.exampleTemplates .note{margin-bottom:0}
#viewTools select{width:auto;font-size:10px;padding:5px 6px;background:#fffffff0}
.diagram-fixed{animation:diagramFixed 3s ease-in-out infinite;transform-origin:65px 37px}
.diagram-hinge{animation:diagramHinge 3s ease-in-out infinite;transform-origin:67px 37px}
.diagram-slider{animation:diagramSlide 3s ease-in-out infinite}
.diagram-ball{animation:diagramBall 4s ease-in-out infinite;transform-origin:66px 37px}
@keyframes diagramFixed{0%,100%{transform:translateX(0)}50%{transform:translateX(14px)}}
@keyframes diagramHinge{0%,100%{transform:rotate(-38deg)}50%{transform:rotate(38deg)}}
@keyframes diagramSlide{0%,100%{transform:translateX(0)}50%{transform:translateX(33px)}}
@keyframes diagramBall{0%,100%{transform:rotate(-35deg) scaleY(.8)}33%{transform:rotate(35deg) scaleY(1)}66%{transform:rotate(5deg) scaleY(.65)}}
@media(prefers-reduced-motion:reduce){.diagram-fixed,.diagram-hinge,.diagram-slider,.diagram-ball{animation:none}}
@media(max-width:800px){#viewTools{top:48px}.jointTypeCard svg{height:64px}}
.libraryFilters{grid-template-columns:minmax(0,1fr)}