.approach-accordion .approach-header {
  cursor: pointer;
  font-weight: bold;
  padding: 10px;
  border: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: background-color 0.3s ease;
}

.approach-accordion .approach-header.active {
  background-color: #f5faff;
}

.approach-accordion .approach-header::after {
  content: "▼";
  display: inline-block;
  margin-left: 8px;
  transition: transform 0.3s ease;
}

.approach-accordion .approach-header.active::after {
  transform: rotate(180deg);
}

.approach-accordion .approach-content {
  overflow: hidden;
  height: 0;
  transition: height 0.45s ease;
  border-left: 1px solid #ccc;
  border-right: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
  transition: height 0.4s ease;
  will-change: height;
}

/* JSが動く前から開いてる状態 */
.approach-content.open[data-instant="true"] {
  transition: none !important; /* ← 初回だけアニメーションを殺す */
}

.approach-accordion .approach-content-inner {
  padding: 10px;
}

.approach-accordion .approach-content-inner > * {
  margin: 10px 0;
}