:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#141418;--panel:#1c1c22;--panel-2:#24242c;--border:#2e2e38;--text:#e8e8ef;--muted:#9a9aa8;--accent:#4c8dff;--danger:#e85d5d;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:13px;line-height:1.4}*{box-sizing:border-box}html,body,#app{background:var(--bg);width:100%;height:100%;color:var(--text);margin:0;overflow:hidden}button,input,select,textarea{font:inherit;color:inherit}button{background:var(--panel-2);border:1px solid var(--border);cursor:pointer;border-radius:4px;padding:4px 10px}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.4;cursor:not-allowed}button.active{border-color:var(--accent);color:#fff;background:#2a3a5c}input[type=text],input[type=number],select,textarea{border:1px solid var(--border);background:#121216;border-radius:4px;width:100%;padding:4px 6px}input[type=color]{border:1px solid var(--border);cursor:pointer;background:0 0;width:42px;height:28px;padding:0}.app-shell{flex-direction:column;width:100%;height:100%;display:flex}.topbar{background:var(--panel);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;height:44px;padding:0 12px;display:flex}.topbar-brand{letter-spacing:.02em;font-weight:600}.topbar-actions{align-items:center;gap:8px;margin-left:auto;display:flex}.file-btn{background:var(--panel-2);border:1px solid var(--border);cursor:pointer;border-radius:4px;align-items:center;padding:4px 10px;display:inline-flex}.export-menu{position:relative}.export-dropdown{background:var(--panel);border:1px solid var(--border);z-index:20;border-radius:6px;flex-direction:column;gap:2px;min-width:120px;padding:4px;display:flex;position:absolute;top:calc(100% + 4px);right:0}.export-dropdown button{text-align:left;background:0 0;border:none}.export-dropdown 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:#1c1c22eb;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{border:1px solid var(--border);background:#121216;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:#4c8dff1f}.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:#ffffff14;border:none}.tree-vis.off{opacity:.9;color:var(--muted)}.tree-row.selected .tree-vis.off{color:#ffffffbf}.viewport-wrap{background:#1a1a1e;flex:1;min-width:0;position:relative}.viewport{width:100%;height:100%}.viewport canvas{display:block;width:100%!important;height:100%!important}.drop-overlay{z-index:5;background:#0a0a0eb8;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.drop-card{text-align:center;background:#1c1c22e6;border:1px dashed #4a4a5a;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 16px;display:inline-block}.error{color:var(--danger)!important;margin-top:12px!important}.loading{z-index:6;background:#000000a6;border-radius:8px;padding:10px 16px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.viewport-stats{color:var(--muted);pointer-events:none;z-index:4;gap:14px;font-size:12px;display:flex;position:absolute;top:12px;left:12px}.hint{color:var(--muted);pointer-events:none;font-size:12px;position:absolute;bottom:12px;left:12px}.inspector{background:var(--panel);border-left:1px solid var(--border);flex-shrink:0;width:300px;overflow:auto}.inspector-empty{color:var(--muted);text-align:center;padding:24px 16px}.panel{border-bottom:1px solid var(--border)}.panel-head{cursor:pointer;-webkit-user-select:none;user-select:none;background:var(--panel-2);justify-content:space-between;align-items:center;padding:10px 12px;font-weight:600;display:flex}.panel-head:hover{background:#2a2a34}.chev{color:var(--muted);font-size:12px}.panel-body{flex-direction:column;gap:8px;padding:10px 12px 14px;display:flex}.row{grid-template-columns:72px 1fr;align-items:center;gap:8px;display:grid}.readonly{color:var(--muted)}.axis-head,.axis-row{grid-template-columns:40px 1fr 1fr 1fr;align-items:center;gap:4px;display:grid}.axis-head{color:var(--muted);text-align:center;font-size:11px}.axis-row span{color:var(--muted)}.axis-row input{min-width:0}.full-btn{width:100%;margin-top:4px}.mat-name{color:var(--accent);margin-bottom:4px}.map-row{grid-template-columns:auto 1fr auto;align-items:center;gap:6px;display:grid}.map-label{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:11px;overflow:hidden}.muted{color:var(--muted)}textarea{resize:vertical;min-height:80px}