body {
  margin: 0;
  padding: 0;
  background: #f2f2f2;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: Arial, sans-serif;
}

.container {
  background: #fff;
  padding: 2em;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 90%;
  max-width: 400px;
  text-align: center;
}

h2 {
  margin-bottom: 1em;
}

.radio-group {
  text-align: left;
  margin-bottom: 1em;
}

.radio-group label {
  display: block;
  margin-bottom: 0.5em;
}

input[type="text"],
input[type="password"] {
  width: 90%;
  padding: 0.5em;
  margin-bottom: 1em;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.hidden-field {
  display: none;
}

button {
  width: 100%;
  padding: 0.75em;
  background-color: #007BFF;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 1em;
}

button:hover {
  background-color: #0056b3;
}

.success-message {
  background-color: #d4edda;
  color: #155724;
  padding: 0.75em;
  margin-bottom: 1em;
  border: 1px solid #c3e6cb;
  border-radius: 5px;
}

@media (max-width: 400px) {
  .container {
    padding: 1em;
  }
}