.rb-btn {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.5em 1.2em;
  border-radius: 4px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border 0.2s;
  outline: none;
  display: inline-block;
}

.rb-btn-primary {
  background: #007bff;
  color: #fff;
  border-color: #007bff;
}
.rb-btn-primary:hover:not(:disabled) {
  background: #0056b3;
  border-color: #0056b3;
}

.rb-btn-secondary {
  background: #6c757d;
  color: #fff;
  border-color: #6c757d;
}
.rb-btn-secondary:hover:not(:disabled) {
  background: #565e64;
  border-color: #565e64;
}

.rb-btn-outline {
  background: #fff;
  color: #007bff;
  border-color: #007bff;
}
.rb-btn-outline:hover:not(:disabled) {
  background: #e7f1ff;
}

.rb-btn-danger {
  background: #dc3545;
  color: #fff;
  border-color: #dc3545;
}
.rb-btn-danger:hover:not(:disabled) {
  background: #a71d2a;
  border-color: #a71d2a;
}

.rb-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}