:root {
  --radius: 12px;
}


.accordion {
  max-width: 100%;
  margin: auto;
    padding:10px 30px;
    background:#ffffff;
}

.acc-item {
  border: 1px solid #ddd;
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}

.acc-item + .acc-item {
  margin-top: 12px;
}

/* タイトルボタン */
.acc-trigger {
  width: 100%;
  text-align: left;
  background: #f8f9fb;
  border: 0;
  padding: 16px 18px;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
}

.acc-trigger:focus {
  outline: 3px solid #a7c7ff;
  outline-offset: 2px;
}

/* アイコン */
.acc-icon {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border: 1.5px solid #666;
  border-radius: 4px;
  font-size: 14px;
  line-height: 1;
}

.acc-trigger[aria-expanded="true"] .acc-icon {
  background: #eef4ff;
}

/* パネル */
.acc-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height 260ms ease;
  will-change: max-height;
  background: #fff;
}

@media (prefers-reduced-motion: reduce) {
  .acc-panel {
    transition: none;
  }
}

.acc-inner {
  padding: 14px 18px 18px;
  border-top: 1px solid #eee;
}