.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
}

.btn-primary {
  background: #2563eb;
  color: white;
}

.btn-secondary {
  background: #e5e7eb;
  color: #111827;
}

.btn-answer {
  background: #f8fafc;
  color: #111827;
  margin: 6px 6px 0 0;
  border: 1px solid #cbd5e1;
}

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