.faq {
  max-width: 700px;
  margin: 40px auto;
  font-family: sans-serif;
}

.faq-item {
  border-bottom: 1px solid #ddd;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 15px 0;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon {
  font-size: 20px;
  transition: transform 0.3s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

/* 開いた状態 */
.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 15px;
}

.faq-item.open .faq-icon {
  content: "−";
}