.accordion {
  position: relative;
  background-color: #f3f3f3;
  color: #222;
  cursor: pointer;
  padding: 12px 16px;
  border: 0;
  text-align: left;
  font-size: 15px;
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
  transition: background-color 0.18s;
  width: 100%;
  font-weight: 700;
}

.accordion::after {
  content: '+';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-weight: 700;
  transition: transform 0.3s ease;
}

.accordion.active {
  background-color: #e9eef6;
}

.accordion.active::after {
  content: '-';
  transform: rotate(180deg);
}

.accordion:hover {
  background-color: #eaeaea;
}

.panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  background-color: #fff;
  padding: 0 14px;
  border-left: 3px solid #d0d0d0;
  border-radius: 0 0 6px 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.panel.active {
  padding: 10px 20px;
  max-height: 500px; /* ou um valor alto suficiente para o conteúdo */
}

h3 {
  color: #000000; /* só um azul bonitão pra exemplo */
}