.bi-wrap { position: relative; display: inline-block; max-width: 100%; line-height: 0; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-top: 4px; user-select: none; }
.bi-wrap canvas { max-width: 100%; max-height: 600px; cursor: crosshair; touch-action: none; }
.bi-sel { position: absolute; border: 2px dashed #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.7); background: rgba(2,96,162,.15); pointer-events: none; }