body { background-color: #f4f6f9; }
.qr-card { text-align: center; }
.qr-card img { max-width: 260px; border: 6px solid #fff; box-shadow: 0 2px 10px rgba(0,0,0,.1); }
.countdown { font-variant-numeric: tabular-nums; font-weight: 600; }
.scan-confirm { max-width: 480px; margin: 40px auto; }