*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:#1b1b1f;color:#f0f0f0}.app{max-width:48rem;margin:0 auto;padding:1rem}button,input{font:inherit}button{background:#3b82f6;color:#fff;border:none;border-radius:.375rem;padding:.5rem .875rem;cursor:pointer}button:hover:not(:disabled){background:#2563eb}button:disabled{opacity:.5;cursor:not-allowed}input{background:#27272a;color:#f0f0f0;border:1px solid #4b5563;border-radius:.375rem;padding:.5rem .75rem}