/* Classroom workbench: one workspace, contextual actions, progressive disclosure. */
.cShelfTabs{display:flex;gap:6px;padding:12px 14px;border-bottom:1px solid #dde6df;background:#fff;flex-shrink:0}.cShelfTabs button{flex:1;border:0;background:#f2f5f1;padding:10px;font-size:14px;color:#718579}.cShelfTabs button[aria-selected=true]{background:#e4f0e8;color:#237f69;font-weight:600}.cShelfPane{overflow:auto;flex:1;min-height:0;padding:16px}.cShelfPane[hidden]{display:none!important}
body.classroom-pending>header,body.classroom-pending>main{visibility:hidden}
body.classroom-pending:before{content:'正在准备搭建工作台…';position:fixed;inset:0;display:grid;place-items:center;background:#eff4f0;color:#487c6c;font:14px system-ui;z-index:100}
body.classroom{--accent:#237f69;background:#edf3ef;overflow:hidden;font-size:13px}
#classroom{height:100dvh;display:flex;flex-direction:column}
#classroom .cHeader{height:50px;min-height:50px;display:flex;align-items:center;gap:16px;padding:0 18px;background:#fff;border-bottom:1px solid #dce6df}
.cBrand{display:flex;align-items:center;gap:8px;white-space:nowrap;font-size:16px}.cBrand span{display:grid;place-items:center;width:28px;height:28px;background:#237f69;color:#fff;border-radius:8px;font-size:20px}
.cHeader .cWorkName{width:170px!important;border:0!important;background:transparent!important;font-weight:600;color:#55756a;font-size:12px}
.cModes{display:flex;gap:3px;background:#eef3ef;border-radius:8px;padding:3px;margin:auto}.cModes button{border:0;background:transparent;color:#718279;min-width:88px;font-size:12px;padding:6px 12px}.cModes button.active{background:white;color:#237f69;box-shadow:0 1px 5px #24473815;font-weight:600}
.cSaveState{font-size:10px;color:#809187;white-space:nowrap}.cHeaderActions{display:flex;gap:6px}.cHeaderActions button{font-size:11px;padding:6px 9px}
.cBody{display:grid;grid-template-columns:222px minmax(250px,1fr) 330px;min-height:0;flex:1}
.cShelf,.cInspector{background:#fff;overflow:auto;min-width:0;overscroll-behavior:contain}.cShelf{border-right:1px solid #dde6df;padding:16px 12px}.cInspector{border-left:1px solid #dde6df;padding:18px 16px}
#classroom .cShelf h2{font-size:14px;margin:0}.cLabelRow{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.cLabelRow small{font-size:10px;color:#87978d}
.cLibraryActions{display:flex;gap:5px;margin:10px 0}.cLibraryActions button{font-size:10px;flex:1;padding:5px}
.cShelf #assetSearch{padding:6px 8px;font-size:11px;margin-bottom:6px}.cShelf #assetList .assetCard{display:block;padding:0;border:0;margin:5px 0}
.cMaterial{display:flex;align-items:center;width:100%;gap:9px;padding:7px;background:#f6f8f5;border:1px solid transparent;text-align:left;min-height:57px}.cMaterial:hover{background:#edf5ee;border-color:#a8c7b8}.cMaterial img{width:42px;height:42px;object-fit:contain;border-radius:7px}.cMaterialInfo{flex:1;min-width:0}.cMaterial b{display:block;font-size:12px}.cMaterial small{display:block;font-size:9px;color:#84958b}.cMaterial .cAdd{font-size:19px;color:#55947b}.cKit{width:100%;background:#edf5ec;border:1px dashed #acc8ac;color:#39794e;font-size:11px;padding:9px;margin:8px 0 13px}.cShelf #carSelection{width:100%;font-size:11px;background:#edf5ec;color:#35764d;border:1px dashed #abc8af;margin:9px 0 12px;padding:9px}
.cShelf details{border:0;padding:8px 0;font-size:11px}.cShelf details summary{font-weight:400;color:#7d9286;padding:0}.cShelf .exampleButtons{flex-wrap:wrap}.cShelf .exampleButtons button{font-size:9px;padding:5px}
.cWorks{border-top:1px solid #e6ece7;margin-top:13px;padding-top:14px}.cWorks .cLabelRow{margin-bottom:7px}.cWorks button#newAssembly{font-size:10px;padding:4px 7px}.cWorks #sceneTree .treeItem{padding:7px 8px;border-radius:5px;font-size:11px;margin:3px 0}.cWorks #sceneTree .treeItem small{display:none}.cWorks #partList{margin:8px 0 0 8px;border-left:1px solid #e0e9e1;padding-left:8px}.cWorks .partButton{padding:6px;font-size:10px;background:transparent}.cWorks .partButton small{display:none}.cWorks .partButton.selected{background:#fff2d8}.cWorks #sceneCounts{font-size:9px;color:#8fa094;display:block;margin-top:10px}
.cStage{position:relative;min-width:0;min-height:0;background:#edf3ef}.cCanvasTools{position:absolute;left:12px;top:12px;z-index:3;display:flex;gap:4px;background:#ffffffed;padding:4px;border:1px solid #e0e8e1;border-radius:8px;box-shadow:0 2px 8px #3b594008}.cCanvasTools button{border:0;padding:5px 8px;background:transparent;font-size:10px}.cCanvasTools button.active{background:#e4f0e6;color:#27734c}.cCanvasTools .cDivider{border-left:1px solid #dfe7de;margin:3px 2px}
#classroom #viewport{height:100%;min-height:0;width:100%}#classroom #viewLabel{display:none}#classroom #viewTools{top:12px;right:12px}#classroom #viewTools button{padding:6px;font-size:10px}#classroom #viewBottom{font-size:9px;padding:8px 12px}#classroom #selectionInfo{bottom:42px;left:12px;font-size:10px;max-width:calc(100% - 24px)}
.cStageNote{position:absolute;top:55px;left:16px;pointer-events:none;font-size:10px;color:#7d9287;max-width:65%;background:#edf3efaa;padding:3px 5px;border-radius:4px}
.cInspector h2{font-size:18px;margin:0 0 8px}.cIntro{font-size:11px;line-height:1.8;color:#829488;margin:0 0 18px}.cEmptyIcon{font-size:28px;color:#76a88b;background:#f0f6ee;width:56px;height:56px;display:grid;place-items:center;border-radius:16px;margin:15px 0}.cTask{border:1px solid #e4ebe2;border-radius:9px;padding:12px;margin:12px 0;font-size:11px;line-height:1.9;color:#7a8d80}.cTask b{display:block;color:#4e6f56;font-size:12px}.cEmptySteps{display:flex;gap:8px;margin:18px 0}.cEmptySteps span{flex:1;background:#f3f7f1;border-radius:7px;text-align:center;padding:9px 5px;font-size:11px;color:#5b7a62}
.cInspector label{font-size:11px;margin:9px 0}.cInspector input,.cInspector select{font-size:12px;padding:7px 8px}.cInspector .cPartName{font-size:17px;font-weight:600;padding:8px 0!important;background:white!important;border:0!important;border-bottom:1px solid #e4ebe3!important;border-radius:0!important}.cPartTag{font-size:10px;color:#8b9a8d;margin:7px 0 16px}.cInspector .cToggle{display:flex;align-items:center;gap:8px;padding:11px;background:#f4f7f1;border-radius:7px;font-size:11px}.cToggle input{accent-color:#237f69}.cInspector details{font-size:11px;border-color:#e5ece4;padding:12px 0}.cInspector summary{font-size:11px;font-weight:500;color:#6e8572}.cInspector .three{gap:6px}.cPairTitle{display:flex;gap:6px;align-items:center;margin:0 0 12px}.cPairChip{padding:6px 9px;background:#eaf5f5;border-left:3px solid #2cabb7;border-radius:4px;font-size:11px;max-width:45%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cPairChip.b{background:#fff4df;border-color:#e5ae48}.cPairTitle .cPairLink{color:#9eaea2;font-size:13px}
#classroom .jointTypeCards{gap:7px;margin:12px 0}#classroom .jointTypeCard{background:#f8faf6;border-color:#e2e9df;border-radius:8px;padding:5px 9px}#classroom .jointTypeCard[aria-pressed=true]{border-color:#39856b;background:#eef6ed;box-shadow:inset 0 0 0 1px #39856b}#classroom .jointTypeCard svg{height:57px}#classroom .jointTypeCard b{font-size:12px}#classroom .jointTypeCard small{font-size:9px;min-height:25px}
.cInspector .cJointSentence{font-size:11px;color:#69836f;line-height:1.7;background:#f4f8f0;border-radius:6px;padding:9px 10px}.cPairOptions{display:grid;grid-template-columns:1.4fr 1fr;gap:8px}.cPairOptions label{margin:7px 0}.cPairOptions select{font-size:10px;padding:7px 5px}.cInspector #anchorPreview{font-size:9px;line-height:1.7;margin:5px 0 10px;color:#8b9a8d}.cDriveSettings{padding:4px 10px 10px;background:#f6f8f3;border-radius:7px}.cAction{width:100%;margin:14px 0 6px;background:#237f69!important;color:white!important;border-color:#237f69!important;padding:10px!important;font-size:12px!important}.cMinor{font-size:10px;color:#8a9a8d;line-height:1.7}.cInspector .cDanger{color:#a46e5d;font-size:10px;background:white;border-color:#e4ded7}.cInspector .cSmallActions{display:flex;gap:6px;margin:12px 0}.cSmallActions button{font-size:10px;padding:6px 9px;flex:1}
.cConnections{border-top:1px solid #e2e9e0;margin-top:18px;padding-top:12px}.cConnections summary{display:flex;align-items:center;gap:7px}.cCount{display:inline-grid;place-items:center;background:#edf4e8;color:#6a8a61;border-radius:20px;min-width:20px;padding:0 6px;font-size:10px}.cConnections .relationRow{margin:6px 0;gap:4px}.cConnections .selectRelation{font-size:10px;padding:8px;background:#f6f9f3;line-height:1.5}.cConnections .selectRelation small{font-size:9px;margin-top:3px}.cConnections .removeRelation{font-size:9px;padding:5px;background:white}.cRelationDrive{color:#43815c!important}.cRunPanel .cRunKeys{padding:14px;background:#f3f7ee;border:1px solid #e2ebd8;border-radius:8px;margin:16px 0;font-size:12px;color:#557347;line-height:2}.cRunPanel #simulationSummary{background:transparent;padding:0;font-size:11px;color:#7a8e7c}.cRunPanel #playSimulation{width:100%;margin-top:12px;padding:9px;background:#237f69;color:white;border-color:#237f69}.cRunPanel #resetSimulation{width:100%;margin:8px 0;font-size:11px}.cRunPanel .cBack{width:100%;margin:8px 0;padding:10px;font-size:12px}
body.classroom #modelDialog .eyebrow{display:none}body.classroom #toast{font-size:11px;padding:10px 18px;bottom:20px}#legacyControls{display:none!important}
@media(max-width:1150px) and (min-width:801px){.cBody{grid-template-columns:190px minmax(250px,1fr) 300px}.cInspector{padding:16px 12px}.cShelf{padding:14px 10px}.cHeader .cWorkName{width:120px!important}.cSaveState{display:none}.cStageNote{max-width:60%}.cCanvasTools button{padding:5px 6px}}
@media(max-width:800px){body.classroom{overflow:auto}#classroom{height:auto;min-height:100dvh}.cBody{display:flex;flex-wrap:wrap}.cStage{width:100%;height:48dvh;min-height:330px;order:1}.cShelf{width:100%;order:2;padding:14px;border-right:0;border-bottom:1px solid #dfe8dd}.cInspector{width:100%;order:3;padding:18px;border:0}.cShelf #assetList{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.cShelf #assetList .assetCard{margin:0}.cMaterial{padding:6px;min-height:53px;gap:6px}.cMaterial img{width:34px;height:34px}.cMaterial b{font-size:11px}.cMaterial small{font-size:9px}.cShelf .cLibraryActions{max-width:300px}.cWorks #partList{display:flex;flex-wrap:wrap;gap:5px}.cWorks .partButton{width:auto;font-size:10px;border:1px solid #e1e9de}.cWorks #sceneTree{display:flex;flex-wrap:wrap;gap:4px}.cWorks #sceneTree .treeItem{width:auto;font-size:10px}.cWorks{padding-top:10px}.cWorks #sceneCounts{display:none}.cShelf details{display:none}.cHeader .cWorkName,.cSaveState{display:none}.cHeaderActions button{font-size:10px;padding:5px}.cHeaderActions{gap:4px}.cHeader .cModes{gap:0;margin-left:auto;margin-right:auto}.cModes button{min-width:54px;padding:5px;font-size:11px}#classroom .cHeader{height:48px;min-height:48px;padding:0 10px;gap:8px}.cBrand{font-size:13px;gap:5px}.cBrand span{width:24px;height:24px;font-size:17px}#classroom #viewTools{top:50px;right:10px}#classroom .cCanvasTools{top:10px;left:10px}.cStageNote{top:51px;left:10px;max-width:50%;font-size:9px}#classroom .cConnections{margin-top:16px}}
/* One project, one relationship graph; full-height tabbed sidebar. */
#classroom .cShelfTabs{gap:24px;padding:0 16px;background:transparent}
#classroom .cShelfTabs [role=tab]{position:relative;flex:0 0 auto;margin:0;padding:14px 2px 12px;border:0;border-radius:0;background:transparent;box-shadow:none;color:#819087;font-size:13px;font-weight:400;cursor:pointer}
#classroom .cShelfTabs [role=tab]:hover{background:transparent;color:#237f69}
#classroom .cShelfTabs [role=tab][aria-selected=true]{background:transparent;color:#237f69;font-weight:600}
#classroom .cShelfTabs [role=tab][aria-selected=true]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:#237f69;border-radius:2px 2px 0 0}
#classroom .cShelfTabs [role=tab]:focus-visible{outline:2px solid #237f69;outline-offset:-4px}
#classroom .cCanvasTools #cDelete{color:#a46e5d}
#classroom .cCanvasTools button:disabled{opacity:.4;cursor:default}
#classroom #cSingle>.cSmallActions:empty{display:none}
#classroom .cShelf #assetList{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
#classroom .cShelf #assetList .assetCard{margin:0;min-width:0}
#classroom .cMaterial{position:relative;flex-direction:column;gap:4px;padding:8px 6px 7px;text-align:center;height:100%;min-width:0}
#classroom .cMaterial img{width:48px;height:44px}
#classroom .cMaterialInfo{width:100%;flex:1}
#classroom .cMaterial b{font-size:12px;overflow-wrap:anywhere}
#classroom .cMaterial small{font-size:9px;margin-top:3px}
#classroom .cMaterial .cAdd{position:absolute;right:7px;top:4px;font-size:16px}
#classroom .cBody{grid-template-columns:300px minmax(250px,1fr) 300px}
#classroom .cShelf{display:flex;flex-direction:column;padding:0;overflow:hidden}
#classroom .cInspector{border:0;border-left:1px solid #dde6df;padding:18px 16px;overflow:auto;background:#fff}
#classroom .cWorks{margin:0;padding:0;border:0}
#classroom .cWorks #partList{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin:0;padding:0;border:0}
#classroom .cWorks .partButton{font-size:12px;padding:9px;border:1px solid #e3ebe4;text-align:left}
#classroom .cConnections{margin-top:14px}
@media(max-width:1150px) and (min-width:801px){#classroom .cBody{grid-template-columns:300px minmax(200px,1fr) 280px}}
@media(max-width:800px){#classroom .cShelf{height:620px;order:2}#classroom .cStage{order:1}#classroom .cInspector{width:100%;padding:18px;border:0;order:3}#classroom .cShelfPane{width:100%}#classroom .cShelf .cConnections{display:block}}