:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#182230;background:#f5f7fb}body{margin:0;min-height:100vh;display:grid;place-items:center}main{box-sizing:border-box;width:min(92vw,440px);padding:32px;background:white;border:1px solid #e5e9f0;border-radius:18px;box-shadow:0 12px 32px #17203312}h1{margin-top:0;font-size:1.5rem}label,input,button{display:block;width:100%;box-sizing:border-box}input{margin:8px 0 14px;padding:12px;border:1px solid #b8c1ce;border-radius:9px;font-size:16px}button{padding:12px;border:0;border-radius:9px;background:#1769e0;color:#fff;font-weight:600;font-size:16px}.plain{margin-top:14px;background:transparent;color:#455468}.code{font-variant-numeric:tabular-nums;letter-spacing:.08em;font-size:clamp(2.5rem,13vw,4.8rem);font-weight:750;text-align:center;margin:22px 0}#source,#time,#ttl{text-align:center;color:#526174}@media(max-width:380px){main{padding:24px 18px}}