*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:#fafafa;color:#111}input,button{font-size:16px}button{cursor:pointer;background:#2563eb;color:#fff;border:none;border-radius:6px}button:hover{background:#1d4ed8}button:disabled{opacity:.6;cursor:not-allowed}