/* 全体 */
body {
  font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  background: #fafafa;
  color: #222;
  margin: 0;
}

.faq-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 20px;
  background: #fff;
}

/* タイトル */
.faq-main-title {
  font-size: 28px;
  text-align: center;
  margin: 0 0 24px;
  border-bottom: 3px solid #ddd;
  padding-bottom: 10px;
}

/* 目次 */
.faq-nav {
  list-style: none;
  padding: 12px 0 18px;
  margin: 0 0 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  border-bottom: 1px solid #eee;
}

.faq-nav li a {
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  color: #333;
}

.faq-nav li a:hover {
  background: #f5f5f5;
}

/* セクション */
.faq-section {
  margin-top: 30px;
}

.faq-section-title {
  font-size: 22px;
  margin-bottom: 12px;
  color: #444;
  border-bottom: 1px solid #ddd;
  padding-bottom: 6px;
}

/* アコーディオン */
.faq-item {
  border-bottom: 1px solid #eee;
  padding: 8px 0;
}

.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 10px 0;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  position: relative;
}

.faq-q::after {
  content: "＋";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
}

.faq-item.open .faq-q::after {
  content: "－";
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
  color: #333;
  line-height: 1.7;
}

/* SP */
@media (max-width: 640px) {
  .faq-main-title { font-size: 24px; }
  .faq-section-title { font-size: 20px; }
  .faq-q { font-size: 15px; }
  .faq-a { font-size: 14px; }
}