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button:hover{background:var(--panel-2)}.main{flex:1;min-height:0;display:flex}.toolbar{z-index:5;pointer-events:none;flex-direction:column;gap:4px;display:flex;position:absolute;top:10px;right:10px}.toolbar button{pointer-events:auto;background:var(--toolbar-bg);border-radius:4px;min-width:44px;padding:6px 8px;font-size:12px;line-height:1.2}.scene-panel{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:240px;min-height:0;display:flex}.scene-search{border-bottom:1px solid var(--border);flex-shrink:0;padding:8px}.scene-search input{background:var(--input);border:1px solid var(--border);border-radius:4px;width:100%;padding:6px 8px}.scene-search input::placeholder{color:var(--muted)}.scene-tree{flex:1;padding:4px 0;overflow:auto}.tree-node{-webkit-user-select:none;user-select:none}.tree-row{cursor:pointer;height:26px;color:var(--text);align-items:center;gap:2px;padding-right:4px;display:flex}.tree-row:hover{background:var(--row-hover)}.tree-row:hover .tree-vis{opacity:1}.tree-row.selected{background:var(--accent);color:#fff}.tree-row.hidden .tree-label{color:var(--muted);opacity:.7}.tree-toggle{width:18px;height:18px;color:inherit;cursor:pointer;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;padding:0;font-size:10px;line-height:1;display:inline-flex}.tree-toggle.invisible{visibility:hidden;pointer-events:none}.tree-toggle:hover{background:0 0;border:none}.tree-label{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:13px;overflow:hidden}.tree-vis{width:22px;height:22px;color:inherit;opacity:.55;cursor:pointer;background:0 0;border:none;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:inline-flex}.tree-vis:hover{opacity:1;background:var(--icon-hover);border:none}.tree-vis.off{opacity:.9;color:var(--muted)}.tree-row.selected .tree-vis.off{color:#ffffffbf}.viewport-wrap{background:var(--viewport);flex:1;min-width:0;position:relative}.viewport{width:100%;height:100%}.viewport canvas{display:block;width:100%!important;height:100%!important}.drop-overlay{background:var(--overlay);z-index:5;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.drop-card{text-align:center;border:1px dashed var(--drop-border);background:var(--drop-card);border-radius:12px;padding:32px 40px}.drop-card h2{margin:0 0 8px;font-size:20px;font-weight:600}.drop-card p{color:var(--muted);margin:0 0 16px}.upload-btn{background:var(--accent);color:#fff;cursor:pointer;border-radius:6px;padding:8px 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