/* ===== FAQ page ===== */
.faq-section {
  padding: 100px 28px;
  background: var(--bg-0);
}
.faq-section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

/* Category nav */
.faq-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-bottom: 100px;
  border: 1px solid var(--line);
  background: var(--bg-1);
}
.faq-nav-item {
  position: relative;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: transparent;
  border-right: 1px solid var(--line);
  text-align: center;
  transition: background 0.3s, color 0.3s;
}
.faq-nav-item:last-child { border-right: none; }
.faq-nav-item::after {
  content: "";
  position: absolute;
  bottom: 0; left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s, left 0.3s;
}
.faq-nav-item:hover { background: var(--bg-2); }
.faq-nav-item.active::after { width: 60%; left: 20%; }
.faq-nav-en {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--accent);
}
.faq-nav-en i { font-style: italic; }
.faq-nav-jp {
  font-family: var(--serif-jp);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-1);
}
.faq-nav-item.active .faq-nav-jp { color: var(--ink-0); }
.faq-nav-count {
  font-family: var(--serif-en);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

/* Categories */
.faq-categories {
  display: flex;
  flex-direction: column;
  gap: 80px;
  margin-bottom: 100px;
}
.faq-category {
  scroll-margin-top: 100px;
}
.faq-category-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.faq-category-en {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--accent);
}
.faq-category-en i { font-style: italic; }
.faq-category-title {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: 0.04em;
  color: var(--ink-0);
  margin: 0;
}

/* Items */
.faq-items {
  list-style: none;
  margin: 0;
  padding: 0;
}
.faq-item {
  border-bottom: 1px solid var(--line);
}
.faq-item button {
  width: 100%;
  display: grid;
  grid-template-columns: 60px 1fr 24px;
  gap: 18px;
  align-items: flex-start;
  padding: 24px 0;
  text-align: left;
  background: transparent;
  transition: padding 0.3s;
}
.faq-item button:hover .faq-item-q { color: var(--accent); }

.faq-item-no {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  padding-top: 4px;
}
.faq-item-no i { font-style: italic; }

.faq-item-q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--serif-jp);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--ink-0);
  line-height: 1.65;
  min-width: 0;
  transition: color 0.3s;
  text-wrap: pretty;
}
.faq-item-mark {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--accent);
  flex-shrink: 0;
}
.faq-item-mark i { font-style: italic; }
.faq-item-mark.a { color: var(--ink-3); }

.faq-item-toggle {
  width: 18px;
  height: 18px;
  position: relative;
  margin-top: 6px;
}
.faq-item-toggle::before, .faq-item-toggle::after {
  content: "";
  position: absolute;
  background: var(--accent);
  transition: transform 0.3s;
}
.faq-item-toggle::before { top: 50%; left: 0; right: 0; height: 1px; transform: translateY(-50%); }
.faq-item-toggle::after { left: 50%; top: 0; bottom: 0; width: 1px; transform: translateX(-50%); }
.faq-item.open .faq-item-toggle::after { transform: translateX(-50%) rotate(90deg); }

.faq-item-a {
  display: grid;
  /* Q行の「番号列」と揃え、本文は十分な幅で折り返す（PCで文字が縦に伸びない） */
  grid-template-columns: 60px minmax(0, 1fr);
  column-gap: 18px;
  row-gap: 0;
  align-items: start;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease), padding 0.45s var(--ease);
}
.faq-item.open .faq-item-a {
  max-height: 3200px;
  padding: 0 0 28px;
}
.faq-item-a .faq-item-mark.a {
  grid-column: 1;
  padding-top: 2px;
}
.faq-item-a p {
  grid-column: 2;
  font-family: var(--serif-jp);
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-2);
  letter-spacing: 0.02em;
  margin: 0;
  display: block;
  max-width: 52em;
  text-wrap: pretty;
}

/* CTA */
.faq-contact { margin-top: 60px; }
.faq-contact-card {
  text-align: center;
  padding: 64px 32px;
  background: var(--bg-1);
  border: 1px solid var(--line);
  position: relative;
}
.faq-contact-card::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  width: 60px; height: 1px;
  background: var(--accent);
  transform: translateX(-50%);
}
.faq-contact-title {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--ink-0);
  margin: 20px 0 24px;
}
.faq-contact-title em {
  font-style: normal;
  color: var(--accent);
}
.faq-contact-lead {
  font-family: var(--serif-jp);
  font-size: 14px;
  line-height: 2;
  color: var(--ink-2);
  letter-spacing: 0.04em;
  margin: 0 0 36px;
}
.faq-contact-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .faq-section { padding: 64px 20px; }
  .faq-nav {
    grid-template-columns: repeat(2, 1fr);
    margin-bottom: 60px;
  }
  .faq-nav-item {
    padding: 16px 8px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .faq-nav-item:nth-child(2n) { border-right: none; }
  .faq-nav-item:nth-last-child(-n+2) { border-bottom: none; }
  .faq-nav-item:nth-child(5):last-child {
    grid-column: span 2;
    border-right: none;
    border-bottom: none;
  }
  .faq-categories { gap: 60px; }
  .faq-category-head {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .faq-item button {
    grid-template-columns: 1fr 24px;
    gap: 12px;
  }
  .faq-item-no { display: none; }
  .faq-item-a {
    grid-template-columns: 1fr;
    padding: 0 32px 0 0;
  }
  .faq-item-a p {
    grid-column: 1;
    max-width: none;
  }
  .faq-item.open .faq-item-a { padding: 0 32px 24px 0; }
  .faq-contact-card { padding: 48px 24px; }
}