*{box-sizing:border-box;margin:0;padding:0}body{color:#111;background:#f4f3f1;min-height:100vh;font-family:-apple-system,Segoe UI,Microsoft YaHei,sans-serif}.card{background:#fff;border:1px solid #e5e3df;border-radius:14px;padding:20px}.btn{cursor:pointer;background:#fff;border:1px solid #d5d4cf;border-radius:10px;align-items:center;gap:6px;padding:8px 14px;font-size:14px;transition:background .15s;display:inline-flex}.btn:hover{background:#f0efec}.btn.primary{color:#fff;background:#111;border-color:#111}.btn.primary:hover{background:#333}.btn:disabled{opacity:.5;cursor:not-allowed}.input{border:1px solid #d5d4cf;border-radius:10px;outline:none;width:100%;padding:9px 12px;font-size:14px}.input:focus{border-color:#111}.label{color:#52514e;margin-bottom:5px;font-size:12px}.code{letter-spacing:1px;font-family:ui-monospace,Consolas,monospace;font-weight:600}.badge{border-radius:999px;padding:2px 9px;font-size:11px;font-weight:600;display:inline-block}.badge.unused{color:#1a7f37;background:#e8f5ec}.badge.used{color:#6e6a63;background:#f0efec}