:root{font-family:system-ui,-apple-system,'PingFang SC',sans-serif;color:#172a40;background:#f3f6fa;font-size:15px}*{box-sizing:border-box}body{margin:0}main{max-width:1040px;margin:0 auto;padding:30px 24px 60px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:44px}.brand{font-size:24px;font-weight:750}.brand small{font-size:12px;letter-spacing:2px;margin-left:8px;color:#788ba3}.badge{background:#e7edf6;color:#4c6485;padding:8px 12px;border-radius:20px;font-size:12px}h1{font-size:36px;letter-spacing:-1px;margin:0 0 12px}.lead{color:#526780;font-size:17px;line-height:1.6}.steps{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;padding:0;gap:10px;margin:28px 0}.steps li{border:1px solid #dae3ee;border-radius:10px;padding:16px;color:#596e88;background:white;font-weight:600}.steps span{display:block;font-weight:400;font-size:12px;margin-top:8px}.steps .done{border-color:#76b6a1;background:#edf9f2;color:#276247}#message{padding:16px 18px;border:1px solid #cbdbee;background:#edf4ff;border-radius:10px;margin-bottom:22px;line-height:1.6}#message.error{border-color:#e7b5a7;background:#fff3ef;color:#87452c}.columns{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{background:white;border:1px solid #dde5ef;border-radius:14px;padding:25px;margin-bottom:20px}h2{font-size:19px;margin:0 0 20px}h3{font-size:16px;margin:24px 0 12px}label{display:block;font-size:13px;margin:16px 0 8px}input{display:block;width:100%;padding:12px;border:1px solid #c9d5e4;border-radius:7px;font:inherit}button{border:0;border-radius:7px;padding:11px 16px;background:#285bc5;color:white;font:inherit;font-weight:550;cursor:pointer;margin-top:12px}button.secondary{color:#284f84;background:#eef3fa}button:disabled{opacity:.5;cursor:not-allowed}button:hover:enabled{filter:brightness(.95)}p{line-height:1.65}.hint,#connections,#breakdown,footer{font-size:12px;color:#63768e}.balance{display:flex;align-items:baseline;gap:12px}.balance strong{font-size:48px;font-weight:650}.balance span{color:#718096}.plan{border:1px solid #d5dfed;padding:15px;border-radius:9px;margin-top:12px}.plan strong{display:block}.plan button{width:100%}.plan p{margin:8px 0;color:#60758e;font-size:13px}.checkout{display:flex;justify-content:space-between;gap:25px}.price{font-size:30px}#qr{object-fit:contain;border:1px solid #ddd;align-self:center}.mono,pre{font-family:ui-monospace,monospace;overflow-wrap:anywhere}pre{white-space:pre-wrap;font-size:12px;line-height:1.9;color:#516880}#receipt{background:#eef9f2;border-radius:8px;padding:2px 18px 12px;margin-top:22px}footer{text-align:center}[hidden]{display:none!important}@media(max-width:650px){main{padding:20px 16px}header{align-items:start;gap:10px}.columns{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr}h1{font-size:28px}.checkout{flex-direction:column}.card{padding:20px}}