body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
}

.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.login-form {
  background-color: #fff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  width: 400px;
}

.login-form h2 {
  text-align: center;
  margin-bottom: 16px;
  color: #333;
}

.login-hint {
  font-size: 13px;
  color: #666;
  line-height: 1.5;
  margin: 0 0 20px;
  text-align: center;
}

.login-hint code {
  font-size: 12px;
  background: #f0f0f0;
  padding: 2px 6px;
  border-radius: 4px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #666;
  font-weight: bold;
}

.form-group input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

#login-btn {
  width: 100%;
  padding: 12px;
  background-color: #009D9A;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  margin-top: 20px;
}

#login-btn:hover {
  background-color: #008B88;
}

.error-message {
  margin-top: 15px;
  color: #ff4d4f;
  text-align: center;
}