.painel-titulo {
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.painel-titulo::after {
  content: '▸';
  font-size: 0.75em;
  transition: transform 0.3s ease;
  display: inline-block;
}

.painel-titulo.aberto::after {
  transform: rotate(90deg);
}

.painel-principal {
  display: none;
  overflow: hidden;
}

.painel-principal.aberto {
  display: block;
}