body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f5f5f5;
  color: #333;
  text-align: center;
  padding: 40px;
}

.container {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input {
  padding: 10px;
  font-size: 16px;
  margin-top: 10px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  margin-top: 10px;
  cursor: pointer;
}

.error {
  color: red;
  margin-top: 10px;
}

.hidden {
  display: none;
}