:root{font-family:Inter,"Microsoft YaHei",sans-serif;color:#172033;background:#f4f7fb}body{margin:0;padding:32px}.card{max-width:720px;margin:auto;background:#fff;border-radius:18px;padding:28px;box-shadow:0 12px 40px #10204018}h1{margin-top:0;color:#3145c5}section{display:grid;gap:12px}input,button{font:inherit;padding:12px;border:1px solid #d8dfef;border-radius:9px}button{background:#4355d6;color:#fff;border:0;cursor:pointer}.balance{display:grid;gap:8px;background:#eef1ff;padding:20px;border-radius:12px}.balance strong{font-size:42px;color:#3145c5}.tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.qr{display:block;width:280px;margin:18px auto}.row{padding:10px 0;border-bottom:1px solid #e7ebf3;color:#516079}.message{color:#bd3d35}