:root { color-scheme: light; font-family: system-ui, sans-serif; color: #213b39; background: #f2f5f3; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 650px; margin: auto; padding: 18px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
h1 { font-size: 19px; letter-spacing: -.5px; margin: 0; }
h1 span { margin-left: 8px; font-size: 10px; letter-spacing: 1px; color: #60736c; vertical-align: middle; }
.intro { font-size: 13px; color: #536762; margin: 12px 0 16px; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.card { padding: 16px; border: 1px solid #d6e2dc; border-radius: 14px; background: #fff; }
label { font-size: 14px; font-weight: 700; }
.hint { color: #61736d; font-size: 11px; margin: 5px 0 14px; }
input { width: 100%; min-width: 0; padding: 10px 8px; border: 1px solid #b6c9c0; border-radius: 7px; color: #163c32; background: #fafcfb; font-family: ui-monospace, monospace; font-size: clamp(15px, 3.5vw, 21px); }
input::placeholder { color: #7b8983; }
input[aria-invalid="true"] { border-color: #b14431; }
button { cursor: pointer; font: inherit; font-size: 13px; font-weight: 650; border: 0; border-radius: 7px; padding: 11px 12px; }
[data-copy] { width: 100%; margin-top: 12px; display: flex; justify-content: space-between; background: #1e6651; color: white; }
.domestic [data-copy] { background: #365c83; }
button:disabled { opacity: .4; cursor: default; }
button:not(:disabled):hover { filter: brightness(.92); }
.quiet { background: transparent; color: #4b655b; padding: 7px; font-size: 12px; }
:focus-visible { outline: 3px solid #c88623; outline-offset: 3px; }
#status { font-size: 12px; min-height: 30px; margin: 12px 0 0; color: #536762; }
#status.error { color: #9e3526; }
footer { font-size: 10px; color: #61736d; }
@media (max-width: 430px) { main { padding: 12px; } .fields { gap: 8px; } .card { padding: 10px; } .hint { min-height: 27px; } label { font-size: 12px; } }
@media (max-width: 300px) { .fields { grid-template-columns: 1fr; } .hint { min-height: 0; } }