.app{max-width:960px;margin:2rem auto;padding:1rem}h1{text-align:center}.toolbar{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}.board{display:flex;flex-direction:column;align-items:flex-start;gap:.75rem}canvas{width:512px;height:512px;border:2px solid #000;border-radius:10px;background:#fff;filter:drop-shadow(4px 4px 8px #00000030);cursor:crosshair}.sticker-bar{display:flex;gap:.5rem;flex-wrap:wrap}button{padding:.5rem .75rem;border:1px solid #cfcfcf;border-radius:10px;background:#fff;cursor:pointer}button.selected{outline:2px solid #4f46e5}button:disabled{opacity:.5;cursor:not-allowed}