.login-container {
  max-width: 300px;
  margin: 50px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  text-align: center;
}

.login-logo {
  width: 150px;
  margin-bottom: 10px;
}

.login-form input {
  width: calc(100% - 22px);
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  font-size: 14px;
}

.login-form button {
  width: 100%;
  padding: 10px;
  background-color: #3498db;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.login-form button:hover {
  background-color: #2980b9;
}

.error-message {
  color: #dc3545;
  background: #f8d7da;
  border: 1px solid #f5c6cb;
  padding: 10px;
  border-radius: 4px;
  margin-bottom: 20px;
  text-align: center;
}

.info-message {
  color: #0c5460;
  background: #d1ecf1;
  border: 1px solid #bee5eb;
  padding: 10px;
  border-radius: 4px;
  margin-bottom: 20px;
  text-align: center;
}

.ontology-title {
  font-size: 1.2em;
  color: #2c3e50;
  margin-bottom: 10px;
}

h1 {
  font-size: 1.5em;
  color: #2c3e50;
  margin-bottom: 20px;
}

.demo-link {
  text-align: center;
  margin-top: 20px;
}

.demo-link a {
  color: #007bff;
  text-decoration: none;
}

.demo-link a:hover {
  text-decoration: underline;
}

.visitor-access {
  text-align: center;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid #e0e0e0;
}

.visitor-access p {
  margin: 10px 0;
  color: #666;
  font-size: 0.9em;
}

.visitor-button {
  background: #007bff;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 1em;
  cursor: pointer;
  transition: background 0.3s ease;
  width: 100%;
  margin: 10px 0;
}

.visitor-button:hover {
  background: #0056b3;
}

.visitor-note {
  font-size: 0.8em;
  color: #888;
  font-style: italic;
  margin-top: 8px;
}