body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;margin:0;background:#f6f7f7}
header{background:#1e1e1e;color:#fff;padding:10px 16px;display:flex;justify-content:space-between;align-items:center}
main{padding:16px}
.panel{background:#fff;border:1px solid #ccd0d4;padding:12px;margin-bottom:12px;border-radius:6px}
.scan-input{margin-top:8px}
input#code{width:70%;padding:8px}
button{padding:8px 12px}
pre#result{background:#f1f5f9;padding:8px;border-radius:6px;max-height:240px;overflow:auto}
.msg.hidden{display:none}
.msg{color:#cc1818;margin-left:8px}
.muted{color:#555}
.dropdown{display:none;position:absolute;z-index:5;max-width:480px}