:root{--bg-base:#0f172a;--bg-surface:#1e293b;--bg-hover:#334155;--bg-active:#312e81;--border:#334155;--text-primary:#e2e8f0;--text-muted:#64748b;--text-dim:#94a3b8;--accent:#7c3aed;--accent-light:#a78bfa;--accent-bg:#1e1b4b}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg-base);width:100%;height:100%;color:var(--text-primary);font-family:system-ui,-apple-system,sans-serif;font-size:13px;overflow:hidden}#root{flex-direction:column;width:100vw;height:100vh;display:flex}#main-layout{flex:1;display:flex;overflow:hidden}#toolbar{background:var(--bg-surface);border-bottom:1px solid var(--border);z-index:10;flex-shrink:0;align-items:center;gap:2px;height:48px;padding:0 8px;display:flex}.tb-group{align-items:center;gap:2px;display:flex}.tb-spacer{flex:1}.tb-sep{background:var(--border);flex-shrink:0;width:1px;height:24px;margin:0 6px}.tb-btn{width:36px;height:36px;color:var(--text-dim);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex;position:relative}.tb-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.tb-btn.active{background:var(--accent);color:#fff}.tb-btn .material-symbols-rounded{font-size:20px;line-height:1}.tb-mode-toggle{border:1px solid var(--border);width:74px;height:32px;color:var(--text-dim);cursor:pointer;background:#0b1222;border-radius:999px;align-items:center;padding:2px;transition:border-color .15s,background .15s;display:flex;position:relative}.tb-mode-toggle:hover{border-color:#4b5a75}.tb-mode-option{z-index:2;text-align:center;letter-spacing:.02em;color:var(--text-muted);-webkit-user-select:none;user-select:none;flex:1;font-size:11px;font-weight:700;transition:color .15s;position:relative}.tb-mode-thumb{background:var(--accent);border-radius:999px;width:34px;height:26px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 2px 8px #7c3aed59}.tb-mode-toggle.is-2d .tb-mode-thumb{transform:translate(36px)}.tb-mode-toggle:not(.is-2d) .tb-mode-option-3d,.tb-mode-toggle.is-2d .tb-mode-option-2d{color:#fff}.tb-mode-toggle:after{content:attr(data-tooltip);background:var(--bg-base);color:var(--text-primary);border:1px solid var(--border);white-space:nowrap;opacity:0;pointer-events:none;z-index:200;border-radius:4px;padding:4px 8px;font-size:11px;transition:opacity .15s;position:absolute;top:calc(100% + 6px);left:50%;transform:translate(-50%)}.tb-mode-toggle:hover:after{opacity:1}.tb-btn:after{content:attr(data-tooltip);background:var(--bg-base);color:var(--text-primary);border:1px solid var(--border);white-space:nowrap;opacity:0;pointer-events:none;z-index:200;border-radius:4px;padding:4px 8px;font-size:11px;transition:opacity .15s;position:absolute;top:calc(100% + 6px);left:50%;transform:translate(-50%)}.tb-btn:hover:after{opacity:1}.tb-badge{color:var(--text-muted);background:0 0;border-radius:6px;align-items:center;gap:4px;padding:4px 10px;font-size:12px;font-weight:600;display:flex}.tb-badge .material-symbols-rounded{font-size:16px}.tb-badge.has-sections{background:var(--accent-bg);color:var(--accent-light)}#sidebar{background:var(--bg-surface);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:280px;transition:width .25s;display:flex;overflow:hidden}#sidebar.hidden{width:0}.sidebar-tabs{border-bottom:1px solid var(--border);flex-shrink:0;display:flex}.sidebar-tab{text-align:center;color:var(--text-muted);cursor:pointer;white-space:nowrap;text-overflow:ellipsis;background:0 0;border:none;border-bottom:2px solid #0000;flex:1;padding:10px 4px;font-size:11px;font-weight:500;transition:color .15s,border-color .15s;overflow:hidden}.sidebar-tab:hover{color:var(--text-dim)}.sidebar-tab.active{color:var(--accent-light);border-bottom-color:var(--accent-light)}.tab-panels{flex-direction:column;flex:1;display:flex;overflow:hidden}.tab-panel{flex-direction:column;flex:1;display:none;overflow:hidden}.tab-panel.active{display:flex}.panel-actions{border-bottom:1px solid var(--border);flex-shrink:0;gap:6px;padding:8px;display:flex}.btn-sm{border:1px solid var(--border);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:6px;flex:1;padding:5px 10px;font-size:11px;transition:all .15s}.btn-sm:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-scroll{flex:1;padding:4px 6px;overflow-y:auto}.sidebar-scroll::-webkit-scrollbar{width:4px}.sidebar-scroll::-webkit-scrollbar-track{background:0 0}.sidebar-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.tree-section-label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);padding:6px 6px 2px;font-size:10px;font-weight:600}.tree-item{border-radius:6px;align-items:center;gap:6px;min-width:0;padding:5px 6px;transition:background .1s;display:flex}.tree-item:hover{background:var(--bg-hover)}.tree-item.is-loaded{opacity:.6}.tree-item-icon{color:var(--text-muted);flex-shrink:0;font-size:16px}.tree-item-info{flex-direction:column;flex:1;gap:1px;min-width:0;display:flex}.tree-item-name{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.file-size{color:var(--text-muted);font-size:10px}.file-size--loading{opacity:.4}.file-size--warn{color:#f59e0b}.visibility-toggle{cursor:pointer;flex-shrink:0;align-items:center;display:flex}.visibility-toggle input{display:none}.visibility-toggle .material-symbols-rounded{color:var(--text-muted);font-size:16px;transition:color .15s}.visibility-toggle:hover .material-symbols-rounded{color:var(--text-primary)}.badge-source{background:var(--accent-bg);color:var(--accent-light);border-radius:3px;flex-shrink:0;padding:1px 5px;font-size:10px}.badge-loaded{color:#86efac;background:#14532d;border-radius:3px;flex-shrink:0;padding:1px 5px;font-size:10px}.btn-load{border:1px solid var(--accent);color:var(--accent-light);cursor:pointer;background:0 0;border-radius:4px;flex-shrink:0;padding:3px 8px;font-size:11px;transition:background .15s}.btn-load:hover{background:var(--accent-bg)}.btn-load:disabled{opacity:.5;cursor:not-allowed}.upload-zone{border:2px dashed var(--border);text-align:center;cursor:pointer;border-radius:8px;flex-shrink:0;margin:8px;padding:16px 12px;transition:border-color .2s,background .2s}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--accent);background:var(--accent-bg)}.upload-zone .material-symbols-rounded{color:var(--text-muted);margin-bottom:4px;font-size:28px;display:block}.upload-zone p{color:var(--text-muted);font-size:11px}.empty-state{color:var(--text-muted);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:32px 16px;display:flex}.empty-state .material-symbols-rounded{opacity:.4;font-size:36px}.empty-state p{font-size:12px;line-height:1.5}.section-item{border-radius:4px;align-items:center;gap:6px;padding:6px 8px;transition:background .15s;display:flex}.section-item:hover{background:var(--bg-hover)}.section-item-icon{color:var(--accent);flex-shrink:0;font-size:14px}.section-item-name{color:var(--text-primary);flex:1;font-size:12px}.section-item-actions{flex-shrink:0;gap:2px;display:flex}.icon-btn{width:24px;height:24px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.icon-btn .material-symbols-rounded{font-size:15px}.icon-btn--danger:hover{color:#ef4444;background:#ef444426}.btn-sm--danger{color:#ef4444;border-color:#ef444466}.btn-sm--danger:hover{color:#ef4444;background:#ef444426}#viewport{background:#e8eaed;flex:1;position:relative;overflow:hidden}#viewport canvas{display:block;width:100%!important;height:100%!important}#loading-overlay{z-index:50;opacity:0;pointer-events:none;background:#0f172abf;flex-direction:column;justify-content:center;align-items:center;gap:14px;transition:opacity .2s;display:flex;position:absolute;inset:0}#loading-overlay.visible{opacity:1;pointer-events:all}.loading-spinner{border:3px solid var(--border);border-top-color:var(--accent-light);border-radius:50%;width:40px;height:40px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}#loading-text{color:var(--text-dim);font-size:13px}.tree-mount{flex-direction:column;display:flex}.tree-loading{color:var(--text-dim);padding:8px 4px;font-size:12px}.tnode{flex-direction:column;display:flex}.tnode-row{border-radius:6px;align-items:center;gap:6px;min-height:26px;padding:4px 6px 4px 0;display:flex}.tnode-row:hover{background:var(--bg-hover,#ffffff0d)}.tnode-arrow{text-align:center;width:14px;color:var(--text-dim);cursor:pointer;-webkit-user-select:none;user-select:none;flex-shrink:0;font-size:10px}.tnode-icon{color:var(--text-dim);flex-shrink:0;font-size:16px}.tnode-label{white-space:nowrap;text-overflow:ellipsis;cursor:pointer;flex:1;min-width:0;font-size:12px;overflow:hidden}.tnode-count{color:var(--text-dim);background:var(--bg-hover,#ffffff0f);border-radius:10px;flex-shrink:0;padding:1px 6px;font-size:10px}.tnode-vis{cursor:pointer;flex-shrink:0;align-items:center;display:flex}.tnode-vis input{display:none}.tnode-vis .material-symbols-rounded{color:var(--text-dim);font-size:16px}.tnode-vis input:checked+.material-symbols-rounded{color:var(--accent-light)}.hidden-section-label{justify-content:space-between;align-items:center;display:flex}.btn-link{color:var(--accent-light);cursor:pointer;background:0 0;border:none;padding:0;font-size:11px}.btn-link:hover{text-decoration:underline}.hidden-item{border-radius:6px;align-items:center;gap:8px;padding:5px 8px;display:flex}.hidden-item:hover{background:var(--bg-hover,#ffffff0d)}.hidden-item-icon{color:var(--text-dim);flex-shrink:0;font-size:16px}.hidden-item-info{flex-direction:column;flex:1;min-width:0;display:flex}.hidden-item-label{white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.hidden-item-model{color:var(--text-dim);font-size:10px}#root.is-loading #toolbar,#root.is-loading #sidebar{pointer-events:none;opacity:.45;filter:grayscale(.4);transition:opacity .2s}.loading-progress-track{background:var(--border);border-radius:2px;width:220px;height:4px;overflow:hidden}#loading-bar{background:var(--accent-light);border-radius:2px;width:0%;height:100%;transition:width .3s}#viewport[data-tool=none] canvas{cursor:grab}#viewport[data-tool=select] canvas{cursor:default}#viewport[data-tool=hide] canvas{cursor:cell}#viewport[data-tool=section] canvas{cursor:crosshair}#viewport[data-tool=measure] canvas{cursor:copy}#viewport[data-tool=box] canvas{cursor:crosshair}.measure-label-overlay{color:#fbbf24;pointer-events:none;white-space:nowrap;z-index:45;background:#0f172ad9;border:1px solid #fbbf24;border-radius:4px;padding:3px 8px;font-size:12px;font-weight:600;display:none;position:absolute;transform:translate(-50%)}.class-item{border-radius:6px;align-items:center;gap:6px;padding:4px 6px;transition:background .1s;display:flex}.class-item:hover{background:var(--bg-hover)}.class-item-icon{color:var(--text-muted);flex-shrink:0;font-size:14px}.class-item-name{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:12px;overflow:hidden}.class-item-count{color:var(--text-muted);background:var(--bg-base);border-radius:10px;flex-shrink:0;padding:1px 5px;font-size:10px}.sel-summary{background:var(--accent-bg);border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:10px 12px;display:flex}.sel-summary-icon{color:var(--accent-light);font-size:18px}.sel-summary-text{color:var(--text-dim);font-size:12px}.sel-summary-text strong{color:var(--accent-light)}.box-select-overlay{border:1.5px dashed var(--accent-light);pointer-events:none;z-index:40;background:#7c3aed14;display:none;position:absolute}.tb-views-popup{background:var(--bg-surface);border:1px solid var(--border);z-index:200;border-radius:8px;min-width:160px;padding:4px;display:none;position:absolute;top:calc(100% + 6px);left:0;box-shadow:0 8px 24px #0006}.tb-views-popup.open{flex-direction:column;gap:2px;display:flex}.tb-views-btn{color:var(--text-dim);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:6px;align-items:center;gap:8px;padding:6px 10px;font-size:12px;transition:background .15s,color .15s;display:flex}.tb-views-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.tb-views-btn .material-symbols-rounded{flex-shrink:0;font-size:18px}#status-bar{height:24px;color:var(--text-muted);pointer-events:none;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f172a99;align-items:center;gap:6px;padding:0 12px;font-size:11px;display:flex;position:absolute;bottom:0;left:0;right:0}.settings-backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:500;opacity:0;background:#00000073;transition:opacity .2s;position:fixed;inset:0}.settings-backdrop.open{opacity:1}.settings-panel{background:var(--bg-surface);border:1px solid var(--border);z-index:510;opacity:0;border-radius:12px;flex-direction:column;width:min(460px,92vw);max-height:80vh;transition:opacity .2s,transform .2s;display:flex;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%)scale(.95);box-shadow:0 20px 60px #0000008c}.settings-panel.open{opacity:1;transform:translate(-50%,-50%)scale(1)}.settings-header{border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:8px;padding:14px 16px;display:flex}.settings-header .material-symbols-rounded{color:var(--accent-light);font-size:20px}.settings-header h3{color:var(--text-primary);flex:1;font-size:14px;font-weight:600}.settings-close{width:28px;height:28px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.settings-close:hover{background:var(--bg-hover);color:var(--text-primary)}.settings-body{flex:1;padding:8px 16px 16px;overflow-y:auto}.settings-body::-webkit-scrollbar{width:4px}.settings-body::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.settings-group{margin-bottom:16px}.settings-group-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);border-bottom:1px solid #33415580;align-items:center;gap:6px;margin-bottom:6px;padding:8px 0 6px;font-size:11px;font-weight:600;display:flex}.settings-group-title .material-symbols-rounded{color:var(--accent-light);font-size:16px}.settings-row{align-items:center;gap:12px;min-height:40px;padding:8px 0;display:flex}.settings-label{flex-direction:column;flex:1;gap:1px;min-width:0;display:flex}.settings-label-text{color:var(--text-primary);font-size:12px}.settings-desc{color:var(--text-muted);font-size:10px;line-height:1.3}.settings-toggle{cursor:pointer;flex-shrink:0;display:inline-flex;position:relative}.settings-toggle input{display:none}.settings-toggle-track{background:#334155;border-radius:10px;width:36px;height:20px;transition:background .2s;position:relative}.settings-toggle-track:after{content:"";background:#94a3b8;border-radius:50%;width:16px;height:16px;transition:transform .2s,background .2s;position:absolute;top:2px;left:2px}.settings-toggle input:checked+.settings-toggle-track{background:var(--accent)}.settings-toggle input:checked+.settings-toggle-track:after{background:#fff;transform:translate(16px)}.settings-slider-wrap{flex-shrink:0;align-items:center;gap:8px;width:160px;display:flex}.settings-slider-wrap input[type=range]{appearance:none;cursor:pointer;background:#334155;border-radius:2px;outline:none;flex:1;height:4px}.settings-slider-wrap input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent-light);border:2px solid var(--bg-surface);cursor:pointer;border-radius:50%;width:14px;height:14px;box-shadow:0 1px 4px #0000004d}.settings-slider-value{color:var(--accent-light);text-align:right;font-variant-numeric:tabular-nums;min-width:32px;font-size:11px;font-weight:600}.settings-select{border:1px solid var(--border);background:var(--bg-base);color:var(--text-primary);cursor:pointer;border-radius:6px;outline:none;flex-shrink:0;padding:4px 8px;font-size:12px}.settings-select:hover{border-color:var(--accent)}.settings-color{border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:6px;flex-shrink:0;width:36px;height:28px;padding:2px}.settings-color::-webkit-color-swatch-wrapper{padding:0}.settings-color::-webkit-color-swatch{border:none;border-radius:4px}.settings-footer{border-top:1px solid var(--border);flex-shrink:0;justify-content:center;padding:12px 16px;display:flex}.settings-reset-btn{color:#ef4444;cursor:pointer;background:0 0;border:1px solid #ef444466;border-radius:6px;align-items:center;gap:6px;padding:6px 14px;font-size:12px;transition:background .15s;display:flex}.settings-reset-btn:hover{background:#ef44441a}.settings-reset-btn .material-symbols-rounded{font-size:16px}