.ppn-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.ppn-preview { max-width: 100%; background: #e9edf1; padding: 12px; margin: 1rem 0; text-align: center; }
.ppn-preview canvas { display: block; max-width: 100%; height: auto; margin: auto; background: white; box-shadow: 0 1px 5px #0002; }
#ppn-tool .qr-field { min-width: 0; }
#ppn-tool input:not([type=checkbox]), #ppn-tool select { max-width: 100%; }
#ppn-tool [hidden] { display: none !important; }
@media (max-width: 600px) { .ppn-grid { grid-template-columns: 1fr; } }