body{font-family:system-ui,-apple-system,sans-serif;background:#fafafa;margin:0}.container{max-width:600px;margin:40px auto;padding:24px}input{display:block;width:100%;box-sizing:border-box;padding:10px;margin-bottom:12px;border:1px solid #ccc;border-radius:6px;font-size:1em}button{padding:10px 20px;border:none;border-radius:6px;background:#4caf50;color:#fff;font-size:1em;cursor:pointer}button:disabled{background:#aaa;cursor:not-allowed}