:root { color-scheme: light; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #19202c; background: #f5f7fb; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; padding: 48px 24px 72px; }
main { width: min(100%, 760px); margin: 0 auto; }
h1 { margin: 0 0 32px; font-size: clamp(2rem, 8vw, 3rem); letter-spacing: -0.04em; }
.generator, .card, .info article, .faq { background: #fff; border: 1px solid #e1e5ed; border-radius: 18px; box-shadow: 0 12px 35px rgba(25, 32, 44, 0.06); }
.generator { padding: clamp(22px, 5vw, 32px); }
.controls { display: grid; grid-template-columns: minmax(0, 1fr) 160px; gap: 16px; }
label { display: block; margin-bottom: 9px; color: #566174; font-size: .875rem; font-weight: 700; }
select, input { width: 100%; min-height: 46px; padding: 0 12px; border: 1px solid #d6dce7; border-radius: 10px; background: #fff; color: #19202c; font: inherit; }
select:focus-visible, input:focus-visible, button:focus-visible { outline: 3px solid #9ca9ff; outline-offset: 3px; }
button { min-height: 44px; padding: 0 16px; border: 1px solid #d6dce7; border-radius: 10px; background: #fff; color: #19202c; cursor: pointer; font: inherit; font-weight: 750; }
button:hover { filter: brightness(.96); }
.generate { width: 100%; margin-top: 20px; border-color: #354bd3; background: #354bd3; color: #fff; }
.feedback { min-height: 1.35rem; margin: 12px 0 0; color: #247043; font-size: .9rem; }
.results { display: grid; gap: 14px; margin-top: 24px; }
.results:empty { display: none; }
.card { padding: 22px; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: #566174; font-size: .875rem; font-weight: 750; }
.number-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px; margin: 18px 0 20px; }
.number { margin: 0; overflow-wrap: anywhere; color: #18213a; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: clamp(1.35rem, 5vw, 1.9rem); font-weight: 750; letter-spacing: .04em; }
.card-details { display: flex; flex-wrap: wrap; gap: 22px; }
.card-details .cardholder { flex: 1 1 220px; }
.card-details p { margin: 0; }
.card-details span { display: block; color: #657083; font-size: .75rem; font-weight: 700; }
.card-details strong { display: block; margin-top: 4px; color: #27324a; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 1rem; }
.copy { min-height: 38px; padding: 0 13px; }
.batch-actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.batch-actions[hidden] { display: none; }
.info { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 34px; }
.info article { padding: 22px; box-shadow: none; }
.info h2 { margin: 0 0 10px; font-size: 1rem; letter-spacing: -.01em; }
.info p, .info ol { margin: 0; color: #566174; font-size: .92rem; line-height: 1.6; }
.info ol { padding-left: 20px; }
.faq { margin-top: 14px; padding: 22px; box-shadow: none; }
.faq > h2 { margin: 0 0 8px; font-size: 1.15rem; }
.faq details { border-top: 1px solid #e1e5ed; }
.faq summary { padding: 16px 0; cursor: pointer; font-weight: 750; }
.faq p { margin: -4px 0 17px; color: #566174; font-size: .92rem; line-height: 1.6; }
.site-footer { padding: 20px 4px 0; text-align: center; }
.site-footer p { margin: 0; color: #657083; font-size: .82rem; line-height: 1.55; }
.site-footer a { color: #354bd3; font-weight: 700; }
@media (max-width: 560px) { body { padding: 28px 16px 52px; } .controls, .info { grid-template-columns: 1fr; } .card-top { align-items: flex-start; flex-direction: column; } .number-row { grid-template-columns: minmax(0, 1fr) auto; gap: 8px; } }