.cmgb-wrapper{display:flex;gap:20px;max-width:1000px;margin:20px auto;font-family:Arial}
.cmgb-controls{width:260px;padding:15px;background:#fafafa;border:1px solid #ddd}
.cmgb-controls label{display:block;margin-bottom:10px}
.cmgb-controls input,.cmgb-controls select,.cmgb-controls button{width:100%;padding:6px}
.cmgb-hint{font-size:12px;color:#555}
.cmgb-cell{border:2px solid #000;position:relative;width:600px;height:400px;box-sizing:border-box}
.grid{display:grid}
.cmgb-cell.selected{outline:3px solid #007cba}
.cmgb-dim{position:absolute;bottom:4px;right:4px;font-size:11px;background:rgba(255,255,255,.8);padding:2px 4px;pointer-events:none}