*{box-sizing:border-box}body{color:#fff;background:#111;margin:0;font-family:Arial,sans-serif}.app{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.card{text-align:center;width:min(960px,100%)}button{cursor:pointer;border:0;border-radius:999px;margin:16px 0;padding:12px 24px;font-size:16px}button:disabled{opacity:.6;cursor:not-allowed}#status{color:#ccc;margin:12px 0 20px}#cameraCanvas{aspect-ratio:9/16;background:#222;border-radius:20px;width:100%;overflow:hidden}@media (width>=768px){#cameraCanvas{aspect-ratio:auto;width:min(100%,960px);height:min(70vh,540px)}}