:root{color-scheme:light dark;font-family:system-ui,-apple-system,Hiragino Sans,sans-serif;line-height:1.6}body{margin:0}main{max-width:480px;margin:0 auto;padding:24px 16px}h1{font-size:22px}label{display:block;margin:16px 0 8px;font-size:14px}input{display:block;width:100%;box-sizing:border-box;margin-top:6px;padding:10px;font-size:16px}button{padding:10px 20px;font-size:16px;margin-top:8px}pre{white-space:pre-wrap;word-break:break-all;font-size:12px;padding:8px;background:#7f7f7f26}.amount{font-size:32px;font-weight:700;margin:8px 0}.message{font-size:18px}.muted{opacity:.7}.error{color:#d33}.done{color:#2a2;font-weight:700}.card{border:1px solid rgba(127,127,127,.35);border-radius:8px;padding:4px 12px 12px;margin:12px 0}.amount-small{font-size:18px;font-weight:700}details{margin:4px 0}