.stage{position:relative;flex:1;min-width:0;background:var(--chrome)}
#grid,#main,#cursorCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}
#cursorCanvas{pointer-events:none}
.collapseBtn{position:absolute;top:12px;left:12px;z-index:11;width:34px;height:34px;border-radius:8px;background:var(--surface);border:1px solid var(--border);color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center}
.collapseBtn:hover{border-color:var(--accent-2)}