.app,#app{max-width:850px;margin:0 auto;padding:.5rem;text-align:center;font-family:Arial,sans-serif}.canvas-container{margin-bottom:2rem;border:2px solid #ccc;border-radius:8px;overflow:hidden}canvas{width:100%;height:auto;display:block}.controls{margin:1rem 0;padding:1rem;background:#f5f5f5;border-radius:8px}input[type=file]{padding:.5rem;background:#fff;border:1px solid #ccc;border-radius:4px;cursor:pointer;margin-bottom:1rem}.gpu-controls{display:flex;gap:1rem;justify-content:center;margin-top:1rem}.gpu-controls button{padding:.5rem 1rem;background:#4a90e2;color:#fff;border:none;border-radius:4px;cursor:pointer;transition:background .2s}.gpu-controls button:hover{background:#357abd}.gpu-controls button:active{background:#2a5f96}