body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin: 24px; }
.muted { opacity: .75; }
.preview video { width: 100%; max-width: 520px; border: 1px solid #ddd; border-radius: 12px; }
.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
button { padding: 8px 12px; }

#qr-reader { border: 1px solid #ddd; border-radius: 12px; padding: 8px; }
pre { margin: 6px 0 0; background: rgba(0,0,0,.04); padding: 10px; border-radius: 10px; }