.serial-checker-form { display:flex; gap:.5rem; margin: .5rem 0 1rem }
.serial-checker-form input[type=text]{ flex:1; padding:.5rem }
.serial-card{ padding:1rem; border:1px solid #e5e7eb; border-radius:.5rem; background:#fff }
.serial-card ul{ list-style:none; margin:0; padding:0 }
.serial-card li{ padding:.15rem 0; }