*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--ink:#333;--ink-light:#666;--ink-muted:#888;--rule:#ddd;--rule-light:#eee;--bg:#f5f5f5;--bg-panel:#fff;--bg-toolbar:#222;--bg-canvas:#fff;--accent:#333;--accent-inv:#fff;--red:#a63d2f;--blue:#2d70b3;--toolbar-h:52px;--timeline-h:44px;--tool-bar-w:44px;--props-w:220px;--status-h:28px;--radius:3px;--font-serif:"Source Serif 4", "Libre Baskerville", Georgia, "Times New Roman", serif;--font-sans:"DM Sans", "Segoe UI", system-ui, sans-serif;--font-math:KaTeX_Main, "Latin Modern Roman", "Times New Roman", Times, serif}html,body,#app{height:100%;font-family:var(--font-sans);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;font-size:13px;line-height:1.45;overflow:hidden}#app{position:relative}#toolbar{height:var(--toolbar-h);background:var(--bg-toolbar);color:var(--accent-inv);-webkit-user-select:none;user-select:none;z-index:100;border-bottom:1px solid #0000002e;flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:0 16px;display:flex;position:relative;box-shadow:inset 0 1px #ffffff0f}#app-title{font-family:var(--font-sans);letter-spacing:.02em;color:#fff;font-size:18px;font-weight:500}#toolbar-center{flex:1;justify-content:center;align-items:center;gap:10px;display:flex}#toolbar-right{align-items:center;gap:4px;display:flex}.control-group{align-items:center;gap:6px;display:flex}.divider{background:#ffffff24;width:1px;height:22px}#toolbar button:not(.menu-item){border-radius:var(--radius);color:#ffffffe6;cursor:pointer;font-size:12px;font-family:var(--font-sans);background:#ffffff12;border:1px solid #ffffff24;align-items:center;gap:6px;height:32px;padding:5px 10px;font-weight:500;transition:background .15s,color .15s,border-color .15s;display:flex}#toolbar button:not(.menu-item) svg{fill:currentColor;flex-shrink:0;width:16px;height:16px}#toolbar button:not(.menu-item):hover{color:#fff;background:#ffffff24;border-color:#ffffff38}#toolbar button.primary:not(.menu-item){background:var(--blue);color:#fff;border-color:#0000;font-weight:600}#toolbar button.primary:not(.menu-item):hover{background:#245a8f}#toolbar button.primary:not(.menu-item).recording{background:var(--red);color:#fff;border-color:#0000}#toolbar button.primary:not(.menu-item).recording:hover{background:#8f3428}#toolbar button:not(.menu-item).active{color:#fff;background:#ffffff2e;border-color:#ffffff40}#toolbar button:not(.menu-item):disabled{opacity:.35;cursor:not-allowed}#toolbar button:not(.menu-item).danger:hover:not(:disabled){color:#fff;background:#a63d2fd9;border-color:#0000}#toolbar button:not(.menu-item).recording{background:var(--red);color:#fff;border-color:#0000}.rec-dot{background:var(--red);border-radius:50%;width:8px;height:8px;display:inline-block}#toolbar-toast{top:calc(var(--toolbar-h) + 10px);z-index:250;pointer-events:none;color:#fff;font-family:var(--font-sans);letter-spacing:.01em;opacity:0;background:#2c3345;border-radius:4px;padding:7px 14px;font-size:12px;font-weight:500;transition:opacity .22s,transform .22s;position:absolute;left:50%;transform:translate(-50%)translateY(-4px);box-shadow:0 6px 18px #2c334538}#toolbar-toast.visible{opacity:1;transform:translate(-50%)translateY(0)}#toolbar-toast.hidden{display:none}button.recording .rec-dot{background:#fff}#toolbar button.icon-only{gap:0;padding:5px 8px}.menu-chevron{opacity:.75;width:14px!important;height:14px!important}.menu-wrap{position:relative}.menu-trigger[aria-expanded=true]{background:#ffffff2e;border-color:#ffffff40}.menu-dropdown{background:var(--bg-canvas);border:1px solid var(--rule);border-radius:var(--radius);z-index:200;min-width:240px;padding:4px;position:absolute;top:calc(100% + 6px);left:0;box-shadow:0 8px 24px #2c334524}.menu-item{text-align:left;width:100%;height:auto;font-family:var(--font-sans);color:var(--ink);cursor:pointer;background:0 0;border:none;border-radius:2px;padding:7px 10px;font-size:12px;font-weight:400;transition:background .12s,color .12s;display:block}.menu-item:hover{background:var(--accent);color:#fff}.menu-item.active{background:var(--bg-panel);color:var(--ink);font-weight:600}.menu-item.active:hover{background:var(--accent);color:#fff}.menu-section-label{font-family:var(--font-sans);letter-spacing:.04em;text-transform:uppercase;color:var(--ink-muted);pointer-events:none;padding:6px 10px 4px;font-size:10px;font-weight:600}.menu-divider{background:var(--rule);height:1px;margin:4px 6px}.menu-item:disabled{opacity:.4;cursor:not-allowed}.menu-item:disabled:hover{color:var(--ink);background:0 0}.menu-item-danger{color:var(--red)}.menu-item-danger:hover:not(:disabled){background:var(--red);color:#fff}.menu-speed{pointer-events:auto;padding:8px 10px 10px}.menu-speed-label{font-family:var(--font-sans);color:var(--ink-light);margin-bottom:6px;font-size:11px;font-weight:500;display:block}.menu-speed-row{align-items:center;gap:8px;display:flex}.menu-speed-row input[type=range]{appearance:none;background:var(--rule);cursor:pointer;border-radius:2px;outline:none;flex:1;min-width:0;height:3px}.menu-speed-row input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);border:2px solid var(--bg-canvas);width:12px;height:12px;box-shadow:0 0 0 1px var(--accent);cursor:pointer;border-radius:50%}.menu-speed-row input[type=range]::-moz-range-thumb{background:var(--accent);border:2px solid var(--bg-canvas);width:12px;height:12px;box-shadow:0 0 0 1px var(--accent);cursor:pointer;border-radius:50%}.menu-speed-value{font-family:var(--font-sans);font-variant-numeric:tabular-nums;color:var(--ink);text-align:right;min-width:28px;font-size:12px}#main-layout{height:calc(100% - var(--toolbar-h) - var(--status-h));display:flex;overflow:hidden}#workspace{flex-direction:column;flex:1;min-width:0;min-height:0;display:flex;position:relative;overflow:hidden}#tool-bar{background:var(--bg-panel);border-right:1px solid var(--rule);flex-shrink:0}#sidebar-wrap{background:var(--bg-panel);border-left:1px solid var(--rule);flex-shrink:0;height:100%;display:flex}.sidebar-toggle{background:var(--bg-panel);border:none;border-right:1px solid var(--rule-light);cursor:pointer;width:22px;color:var(--ink-muted);flex-shrink:0;justify-content:center;align-self:stretch;align-items:center;padding:0;transition:background .12s,color .12s;display:flex}.sidebar-toggle:hover{color:var(--ink);background:#2c33450f}.sidebar-toggle svg{width:14px;height:14px;transition:transform .18s}#sidebar-wrap:not(.collapsed) .sidebar-toggle svg{transform:rotate(180deg)}#sidebar-panel{width:var(--props-w);flex-direction:column;min-height:0;transition:width .2s,opacity .15s;display:flex;overflow:hidden}#sidebar-wrap.collapsed #sidebar-panel{opacity:0;pointer-events:none;width:0}.sidebar-section{flex-direction:column;flex:50%;min-height:0;display:flex;overflow:hidden}.sidebar-section-properties{border-top:1px solid var(--rule)}#object-browser-panel,#properties-panel{flex:1;min-height:0;padding:12px 10px;overflow:hidden auto}#tool-bar{width:var(--tool-bar-w);border-right:1px solid var(--rule);flex-direction:column;align-items:center;gap:4px;padding:8px 4px;display:flex}#object-browser-panel h3,#properties-panel h3{font-family:var(--font-sans);letter-spacing:.05em;color:var(--ink-muted);border-bottom:1px solid var(--rule-light);flex-shrink:0;margin-bottom:8px;padding-bottom:5px;font-size:11px;font-weight:600}.ob-fs{border-radius:var(--radius);min-height:48px;transition:background .12s,outline-color .12s}.ob-fs.ob-drop-over{outline:1px dashed var(--blue);outline-offset:2px;background:#2d70b30a}.ob-list{flex-direction:column;gap:0;display:flex}.ob-empty,.ob-hint{color:var(--ink-muted);margin:8px 0 0;font-size:10px;line-height:1.4}.ob-node{position:relative}.ob-children{border-left:1px solid var(--rule-light);flex-direction:column;margin:0 0 2px 11px;padding-left:12px;display:flex}.ob-row{text-align:left;border-radius:var(--radius);width:100%;color:var(--ink);font-family:var(--font-sans);cursor:default;background:0 0;border:1px solid #0000;align-items:center;gap:2px;padding:3px 4px 3px 2px;font-size:12px;display:flex}.ob-row:hover{background:#2c33450f}.ob-row.selected{background:#2d70b314;border-color:#2d70b359}.ob-row.ob-dragging{opacity:.45}.ob-row.ob-drop-over{border-color:var(--blue);background:#2d70b31a}.ob-drop-reject{animation:.35s ob-shake}@keyframes ob-shake{0%,to{transform:translate(0)}25%{transform:translate(-3px)}75%{transform:translate(3px)}}.ob-row-main{cursor:pointer;min-width:0;color:inherit;font:inherit;text-align:left;background:0 0;border:none;flex:1;align-items:center;gap:6px;margin:0;padding:0;display:flex}.ob-icon{width:14px;height:14px;color:var(--ink-muted);flex-shrink:0;justify-content:center;align-items:center;display:inline-flex}.ob-ico{width:14px;height:14px;display:block}.ob-ico-meta{color:var(--ink-muted);font-size:12px;line-height:1}.ob-parameter-icon{color:var(--ink-muted);font-family:Georgia,Times New Roman,serif;font-size:15px;font-style:italic;line-height:1}.ob-row[data-kind=aggregate] .ob-icon,.ob-row[data-kind=weld] .ob-icon,.ob-row[data-kind=rope] .ob-icon{color:#888}.ob-row[data-kind=constraint] .ob-icon{color:var(--blue)}.ob-name{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.ob-meta{color:var(--ink-muted);text-transform:lowercase;letter-spacing:.02em;text-overflow:ellipsis;flex-shrink:0;max-width:56px;font-size:9px;overflow:hidden}.ob-twist,.ob-twist-spacer{flex-shrink:0;justify-content:center;align-items:center;width:16px;height:18px;display:inline-flex}.ob-twist{cursor:pointer;color:var(--ink-muted);background:0 0;border:none;border-radius:2px;padding:0;font-size:10px}.ob-twist:hover{color:var(--ink);background:#2c334514}.ob-rename{width:100%;font:inherit;border:1px solid var(--rule);border-radius:var(--radius);color:var(--ink);background:#fff;padding:1px 3px;font-size:12px}.tool-btn{border-radius:var(--radius);cursor:pointer;width:32px;height:32px;color:var(--accent);background:0 0;border:1px solid #0000;justify-content:center;align-items:center;padding:0;transition:background .12s,border-color .12s;display:flex;position:relative}.tool-btn svg{width:20px;height:20px}.tool-btn:hover{border-color:var(--rule);background:#2c33450f}.tool-btn.active{background:var(--accent);color:#fff;border-color:#0000}.tool-btn.active svg{color:#fff;stroke:#fff}.tool-btn:after{content:attr(data-tip);background:var(--accent);color:#fff;font-family:var(--font-sans);white-space:nowrap;border-radius:var(--radius);pointer-events:none;opacity:0;visibility:hidden;z-index:50;padding:4px 8px;font-size:11px;transition:opacity .12s,visibility .12s;position:absolute;top:50%;left:calc(100% + 8px);transform:translateY(-50%);box-shadow:0 2px 8px #0000001f}.tool-btn:hover:after,.tool-btn:focus-visible:after{opacity:1;visibility:visible}body.shift-pan-preview .tool-btn.active:not([data-tool=pan]),body.shift-pan-preview .obj-btn.active{color:var(--ink-muted);opacity:.45;background:#2c33450f;border-color:#0000}body.shift-pan-preview .tool-btn.active:not([data-tool=pan]) svg{color:inherit;stroke:currentColor;fill:currentColor}body.shift-pan-preview .obj-btn.active svg{stroke:currentColor}body.shift-pan-preview .tool-btn[data-tool=pan]{background:var(--accent);color:#fff;box-shadow:0 0 0 2px var(--bg-panel), 0 0 0 4px var(--accent);border-color:#0000}body.shift-pan-preview .tool-btn[data-tool=pan] svg{color:#fff;stroke:#fff}body.shift-pan-preview .tool-btn[data-tool=pan]:after{content:"Pan (Shift)";opacity:1;visibility:visible}#object-bar{background:var(--bg-panel);border-left:1px solid var(--rule);border-right:1px solid var(--rule);flex-direction:column;flex-shrink:0;align-items:center;gap:6px;width:46px;padding:10px 4px;display:flex}.obj-bar-section{flex-direction:column;align-items:center;gap:4px;display:flex}.obj-bar-section+.obj-bar-section{border-top:1px solid var(--rule);padding-top:6px}.obj-btn{border-radius:var(--radius);cursor:pointer;width:32px;height:32px;color:var(--accent);background:0 0;border:1px solid #0000;justify-content:center;align-items:center;padding:0;transition:background .12s,border-color .12s;display:flex}.obj-btn svg{width:20px;height:20px}.obj-btn:hover{border-color:var(--rule);background:#2c33450f}.obj-btn.active{background:var(--accent);color:#fff;border-color:#0000}.obj-btn.active svg{stroke:#fff}.obj-btn{touch-action:none;-webkit-user-select:none;user-select:none}#palette-drag-ghost{pointer-events:none;z-index:9999;background:var(--bg-canvas);border:1px solid var(--rule);border-radius:var(--radius);opacity:.9;justify-content:center;align-items:center;width:36px;height:36px;display:flex;position:fixed;transform:translate(-50%,-50%);box-shadow:0 2px 10px #2c33451f}#palette-drag-ghost svg{width:20px;height:20px}#sandbox-svg.palette-drop-target{outline:2px solid var(--blue);outline-offset:-2px}.hint{color:var(--ink-light);font-size:11px;font-style:italic;line-height:1.5}.prop-row{border-bottom:1px solid var(--rule-light);justify-content:space-between;align-items:center;gap:6px;padding:4px 0;display:flex}.prop-label{font-family:var(--font-sans);color:var(--ink-light);font-size:11px}.math{font-family:var(--font-math);letter-spacing:0;font-style:italic;font-weight:400}.math sub{vertical-align:baseline;font-size:.72em;font-style:italic;position:relative;bottom:-.22em}.prop-label .math,.prop-section-title .math{color:inherit}.prop-section-title .math{font-weight:400}.prop-value{font-family:var(--font-sans);font-variant-numeric:tabular-nums;color:var(--ink);text-align:right;background:0 0;border:none;border-radius:2px;width:84px;padding:2px 4px;font-size:11px}.prop-value:focus{outline:1px solid var(--accent);background:var(--bg-canvas)}.prop-parameter-expression{color:var(--ink);font-family:var(--font-math);text-overflow:ellipsis;white-space:nowrap;max-width:150px;font-size:11px;overflow:hidden}select.prop-value{cursor:pointer;width:auto;min-width:84px;max-width:118px}.prop-section-title{font-family:var(--font-sans);letter-spacing:.04em;color:var(--ink-muted);margin:10px 0 4px;font-size:10px;font-weight:600}.prop-expr-input{box-sizing:border-box;width:100%;font-family:var(--font-mono,ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace);font-variant-numeric:tabular-nums;color:var(--ink);background:var(--bg-canvas);border:1px solid var(--rule);border-radius:var(--radius);text-align:left;margin:4px 0 6px;padding:5px 8px;font-size:11px;display:block}.prop-expr-input:focus{outline:1px solid var(--accent);border-color:var(--accent)}.prop-math-expr-wrap{box-sizing:border-box;width:100%;min-height:34px;margin:4px 0 6px;display:block}.prop-math-expr-wrap math-field{box-sizing:border-box;width:100%;min-height:2rem;color:var(--ink);background:var(--bg-canvas);border:1px solid var(--rule);border-radius:var(--radius);--contains-highlight-background-color:color-mix(in srgb, var(--accent) 18%, transparent);--selection-background-color:color-mix(in srgb, var(--accent) 28%, transparent);--primary:var(--accent);padding:4px 6px;font-size:16px;display:block}.prop-math-expr-wrap math-field:focus-within{outline:1px solid var(--accent);border-color:var(--accent)}.prop-parameter-row{border-bottom:1px solid var(--rule-light);padding:4px 0 2px}.prop-parameter-row .prop-label{display:block}.prop-parameter-unit{color:var(--ink-muted);font-style:normal}.prop-driven-parameter-wrap{margin:3px 0 2px}math-field.prop-math-expr-field::part(virtual-keyboard-toggle),math-field.prop-math-expr-field::part(menu-toggle){display:none}.prop-expr-error{color:var(--red);margin:0 0 4px;font-size:10px;line-height:1.35}.prop-delete-btn{border:1px solid var(--red);border-radius:var(--radius);width:100%;color:var(--red);cursor:pointer;font-family:var(--font-sans);background:0 0;margin-top:12px;padding:6px;font-size:11px;font-weight:500;transition:background .12s,color .12s;display:block}.prop-delete-btn:hover{background:var(--red);color:#fff}.prop-back-btn{color:var(--blue);cursor:pointer;font-family:var(--font-sans);background:0 0;border:none;align-items:center;margin:0 0 4px;padding:2px 0;font-size:11px;font-weight:500;display:inline-flex}.prop-back-btn:hover{text-decoration:underline}.prop-action-btn{font:inherit;border:1px solid var(--rule);background:var(--surface,#fff);color:var(--ink);cursor:pointer;border-radius:4px;padding:5px 10px;font-size:12px}.prop-action-btn:hover{background:#2c33450f}.prop-component-list{flex-direction:column;gap:4px;margin:0 0 4px;display:flex}.prop-component-row{background:var(--bg-canvas);border:1px solid var(--rule-light);border-radius:var(--radius);width:100%;color:var(--ink);cursor:pointer;text-align:left;font-family:var(--font-sans);flex-direction:column;align-items:flex-start;gap:1px;padding:6px 8px;display:flex}.prop-component-row:hover{border-color:var(--blue);background:#f0f6fc}.prop-component-name{font-size:12px;font-weight:600}.prop-component-meta{color:var(--ink-light);font-size:10px}.prop-optional-bar{width:100%;margin:0 0 10px}.prop-optional-add{box-sizing:border-box;text-align:center;width:100%;display:block}.prop-optional-list{flex-direction:column;gap:4px;margin:8px 0 4px;display:flex}.prop-optional-row{background:var(--bg-canvas);border:1px solid var(--rule-light);border-radius:var(--radius);width:100%;color:var(--ink);cursor:pointer;text-align:left;font-family:var(--font-sans);flex-direction:column;align-items:flex-start;gap:2px;padding:6px 8px;display:flex}.prop-optional-row:hover{border-color:var(--blue);background:#f0f6fc}.prop-optional-name{font-size:11px;font-weight:600}.prop-optional-meta{color:var(--ink-light);font-size:10px;line-height:1.3}.prop-optional-header{justify-content:space-between;align-items:center;gap:8px;display:flex}.prop-optional-remove{border:1px solid var(--rule-light);border-radius:var(--radius);color:var(--ink-muted);cursor:pointer;font-size:10px;font-family:var(--font-sans);background:0 0;padding:2px 6px}.prop-optional-remove:hover{color:#c44;border-color:#c44}.prop-optional-hint{color:var(--ink-muted)}#camera-overlay{pointer-events:none;z-index:4;width:100%;height:100%;display:none;position:absolute;inset:0;overflow:visible}#canvas-container{background:var(--bg-canvas);min-height:0;box-shadow:inset 0 0 0 1px var(--rule-light);-webkit-user-select:none;user-select:none;-webkit-user-drag:none;flex:1;position:relative;overflow:hidden}#canvas-container *{-webkit-user-select:none;user-select:none}#sandbox-svg{cursor:crosshair;touch-action:none;width:100%;height:100%;display:block}#sandbox-svg.mode-select{cursor:default}#sandbox-svg.mode-pan{cursor:grab}#sandbox-svg.mode-pan:active{cursor:grabbing}#sandbox-svg.mode-rotate{cursor:crosshair}#sandbox-svg.mode-scale{cursor:default}#sandbox-svg.mode-measure{cursor:crosshair}#sandbox-svg.mode-camera{cursor:default;pointer-events:none}#camera-overlay.camera-pan-ready{cursor:grab}#camera-overlay.camera-pan-active{cursor:grabbing}#camera-overlay [data-cam-handle=origin],#camera-overlay [data-cam-handle=move]{cursor:move}.export-size-readout{font-variant-numeric:tabular-nums;color:var(--ink)}#canvas-overlay{pointer-events:none;position:absolute;top:10px;right:14px}#basis-indicator{pointer-events:none;opacity:.6;position:absolute;top:10px;left:10px}#sim-time{font-family:var(--font-sans);font-variant-numeric:tabular-nums;color:var(--ink-light);border-radius:var(--radius);border:1px solid var(--rule);background:#ffffffeb;padding:3px 8px;font-size:12px}#status-bar{height:var(--status-h);background:var(--bg-panel);border-top:1px solid var(--rule);font-family:var(--font-sans);color:var(--ink-light);flex-shrink:0;align-items:center;gap:20px;padding:0 14px;font-size:11px;display:flex}#status-bar strong{font-family:var(--font-sans);color:var(--ink);font-weight:600}#status-record{color:var(--red);font-weight:600}.hidden{display:none!important}.toggle-label{cursor:pointer;flex-shrink:0;align-items:center;gap:0;display:flex}.toggle-label input[type=checkbox]{display:none}.toggle-track{background:var(--rule);border-radius:8px;width:30px;height:16px;transition:background .15s;position:relative}.toggle-label input:checked+.toggle-track{background:var(--accent)}.toggle-thumb{background:#fff;border-radius:50%;width:12px;height:12px;transition:transform .15s;position:absolute;top:2px;left:2px;box-shadow:0 1px 2px #0003}.toggle-label input:checked+.toggle-track .toggle-thumb{transform:translate(14px)}#env-section .prop-row{padding:4px 0}#env-section .prop-row-slider{align-items:center;gap:10px}#env-section .prop-slider-wrap{flex:1;justify-content:flex-end;align-items:center;gap:8px;min-width:0;display:flex}#env-section .prop-slider-wrap input[type=range]{appearance:none;background:var(--rule);cursor:pointer;border-radius:2px;outline:none;flex:1;min-width:72px;max-width:140px;height:3px}#env-section .prop-slider-wrap input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);border:2px solid 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