:root{color:#111827;background:#fff;font-family:system-ui,sans-serif}*,:before,:after{box-sizing:border-box}body{min-width:320px;margin:0}#root{min-height:100vh}.backend-test{max-width:40rem;margin:0 auto;padding:2rem 1rem}button{min-height:44px;font:inherit;cursor:pointer;padding:.625rem 1rem}button:disabled{cursor:wait}pre{background:#f3f4f6;padding:1rem;overflow-x:auto}[role=alert]{color:#b91c1c}