html, body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  height: 100%;
  width: 100%;
}

.btn-primary {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  font-weight: 500;
  color: #ffffff;
  background-color: #3498db;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s;
  margin-top: 0.5rem;
}
.btn-primary:hover:not(:disabled) {
  background-color: #0292a3;
}
.btn-primary:disabled {
  background-color: #95a5a6;
  cursor: not-allowed;
}

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background-color: #f4f6f9;
  padding: 1rem;
}
.login-container .login-card {
  width: 100%;
  max-width: 400px;
  background: #ffffff;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.login-container .login-card .login-logo {
  display: block;
  width: 96px;
  height: 96px;
  margin: 0 auto 1rem;
  object-fit: contain;
}
.login-container .login-card h2 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: #2c3e50;
  text-align: center;
}
.login-container .login-card .alert-danger {
  background-color: #f8d7da;
  color: #721c24;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  border: 1px solid #f5c6cb;
}
.login-container .login-card .form-group {
  margin-bottom: 1.25rem;
}
.login-container .login-card .form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #495057;
}
.login-container .login-card .form-group .form-control {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid #ced4da;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
}
.login-container .login-card .form-group .form-control:focus {
  border-color: #3498db;
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}
.login-container .login-card .form-group .form-control:disabled {
  background-color: #e9ecef;
  cursor: not-allowed;
}