body{
 background:#0f1115;
 color:#e5e7eb;
 font-family:monospace;
 margin:0;
 display:flex;
 justify-content:center;
}

#app{
 padding:30px;
 max-width:420px;
 width:100%;
}

input,select,button{
 width:100%;
 padding:14px;
 margin-bottom:12px;
 font-size:15px;
 background:#111827;
 color:white;
 border:1px solid #374151;
}

button{
 background:#16a34a;
 cursor:pointer;
}

#syncBtn{
 background:#2563eb;
}

#stopScan{
 background:#ef4444;
}

#salesStats{
 margin-bottom:20px;
 padding:15px;
 background:#111827;
 border:1px solid #374151;
}

.stat{
 font-size:13px;
 margin-bottom:4px;
}

#scanner{
 margin-bottom:10px;
}

#message{
 padding:10px;
 background:#111827;
 border:1px solid #374151;
}