.code-input { letter-spacing: .3em; font-variant-numeric: tabular-nums; }
#qr img { display: block; width: 200px; height: 200px; image-rendering: pixelated; }
@media print {
    nav, .btn, form { display: none !important; }
}
.code-box { width: 7.5rem; }
details > summary { cursor: pointer; }
.print-page { max-width: 820px; }
.sign-row td { height: 3.2rem; }
@media print {
    .no-print { display: none !important; }
    .print-page { max-width: none; padding: 0 !important; }
    @page { size: A4; margin: 20mm; }
}