/* ---------- よくある質問（FAQ）: テーマは CSS 変数で上書き可能 ---------- */
.grain-faq {
  --grain-faq-primary: #0553dd;
  --grain-faq-primary-light: #0553dd;
  --grain-faq-accent: #0b0a0a;
  --grain-faq-page-bg: #fff;
  --grain-faq-border: #ddd;
  --grain-faq-bg-expanded: #f4f4f5;
  --grain-faq-text: #1d2327;
  --grain-faq-muted: #6b7280;
  padding: min(4.8611111111vw, 70px) min(5.5555555556vw, 80px) min(6.9444444444vw, 100px);
  background: var(--grain-faq-page-bg);
}
.grain-faq__inner {
  max-width: 1280px;
  margin: 0 auto;
}
.grain-faq__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: min(1.3888888889vw, 12px);
  justify-content: center;
  margin-bottom: min(5.5555555556vw, 72px);
}
.grain-faq__tab {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1.2rem 2.7rem;
  font-size: clamp(0.8125rem, 0.35vw + 0.7rem, 0.9375rem);
  font-weight: 600;
  color: var(--grain-faq-text);
  background: #fff;
  border: 1px solid var(--grain-faq-border);
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s;
}
.grain-faq__tab:hover {
  border-color: #c5cedd;
}
.grain-faq__tab-chevron {
  flex-shrink: 0;
  width: 0.55rem;
  height: 0.55rem;
  border-right: 2px solid var(--grain-faq-primary-light);
  border-bottom: 2px solid var(--grain-faq-primary-light);
  transform: rotate(45deg);
  margin-top: -0.15em;
  transition: transform 0.2s;
}
.grain-faq__cat-title {
  text-align: center;
  font-size: clamp(1.375rem, 1.2vw + 1rem, 1.75rem);
  font-weight: 700;
  color: var(--grain-faq-primary);
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}
.grain-faq__cat-title::after {
  content: "";
  display: block;
  width: 3rem;
  height: 4px;
  margin: 0.75rem auto 0;
  background: var(--grain-faq-primary);
  border-radius: 2px;
}
.grain-faq__panels {
  margin-top: min(2.7777777778vw, 36px);
  display: flex;
  flex-direction: column;
  gap: min(8.3333333333vw, 96px);
}
.grain-faq__panel {
  display: block;
}
.grain-faq__list {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 80%;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
}
.grain-faq__item {
  border-radius: 8px;
  overflow: visible;
}
.grain-faq__item .grain-faq__trigger {
  padding: min(1.3888888889vw, 18px) min(1.7361111111vw, 20px);
  background: #fff;
}
.grain-faq__item:not(.is-open) .grain-faq__trigger {
  padding: min(0.5555555556vw, 8px) min(1.7361111111vw, 20px);
}
.grain-faq__item.is-open {
  background: transparent;
  padding: 0;
}
.grain-faq__trigger {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  align-items: center;
  column-gap: min(1.0416666667vw, 14px);
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
  font: inherit;
  color: var(--grain-faq-text);
}
.grain-faq__q-badge,
.grain-faq__a-badge {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.grain-faq__q-badge {
  background: var(--grain-faq-primary);
}
.grain-faq__a-badge {
  background: var(--grain-faq-accent);
}
.grain-faq__question-text {
  flex: 1;
  font-weight: 700;
  font-size: clamp(0.9375rem, 0.25vw + 0.85rem, 1.0625rem);
  line-height: 1.55;
  padding-right: 0.5rem;
}
.grain-faq__chevron {
  flex-shrink: 0;
  width: 0.65rem;
  height: 0.65rem;
  border-right: 2px solid var(--grain-faq-muted);
  border-bottom: 2px solid var(--grain-faq-muted);
  transform: rotate(45deg);
  transition: transform 0.25s ease;
  margin-top: -0.35rem;
}
.grain-faq__item.is-open .grain-faq__chevron {
  transform: rotate(-135deg);
  margin-top: 0.15rem;
}
.grain-faq__answer {
  /* JS で scrollHeight を測って max-height をアニメーションさせる方式は、
     ブラウザが毎フレーム レイアウト再計算を強いられるため本質的にカクつきやすく、
     さらに高さの目標値がズレて終了時に補正ジャンプが起きる問題があった。
     grid-template-rows を 0fr/1fr で切り替える方式に変更し、JS 側の高さ計測を撤廃。
     ブラウザ自身が正確な高さを補間するため、ジャンプもカクつきも発生しない。 */
  display: grid;
  grid-template-columns: 2rem 1fr;
  grid-template-rows: 0fr;
  column-gap: min(1.0416666667vw, 14px);
  align-items: flex-start;
  background: var(--grain-faq-bg-expanded);
  border-radius: 8px;
  margin: 0;
  padding: 0 min(1.7361111111vw, 20px);
  box-sizing: border-box;
  overflow: hidden;
  opacity: 0;
  transition: grid-template-rows 0.5s ease, opacity 0.4s ease, padding 0.5s ease;
}
.grain-faq__item.is-open .grain-faq__answer {
  grid-template-rows: 1fr;
  padding-top: min(1.25vw, 16px);
  padding-bottom: min(1.25vw, 16px);
  opacity: 1;
}
.grain-faq__answer .grain-faq__a-badge,
.grain-faq__answer .grain-faq__answer-body {
  /* grid item の自動最小サイズ（min-height: auto）を解除しないと
     grid-template-rows: 0fr にしても行が 0 まで縮まらないため必須 */
  min-height: 0;
  overflow: hidden;
}
.grain-faq__answer-body {
  flex: 1;
  min-width: 0;
  font-size: clamp(0.875rem, 0.2vw + 0.8rem, 1rem);
  font-weight: 400;
  line-height: 1.75;
  color: var(--grain-faq-text);
  padding-top: 0.15rem;
}
.grain-faq__answer-body a {
  color: #0553dd;
}
@media screen and (min-width: 769px) {
  .grain-faq .grain-faq__trigger {
    margin-top: 0;
  }
  .grain-faq__list {
    gap: min(2.0833333333vw, 26px);
  }
  .grain-faq__cat-title + .grain-faq__list {
    margin-top: min(1.5277777778vw, 22px);
  }
}
@media screen and (max-width: 768px) {
  .grain-faq {
    padding-bottom: min(13vw, 72px);
  }
  .grain-faq .grain-faq__trigger {
    margin-top: 0;
  }
  .grain-faq__panels {
    gap: 19.3333333333vw;
    margin-top: min(17.0666666667vw, 56px);
  }
  .grain-faq__list {
    width: 100%;
    margin-top: min(10.1333333333vw, 38px);
    gap: min(8vw, 28px);
  }
  .grain-faq__tabs {
    flex-direction: column;
    align-items: stretch;
    gap: min(6.9333333333vw, 24px);
  }
  .grain-faq__tab {
    justify-content: flex-start;
  }
  .grain-faq__trigger,
  .grain-faq__answer {
    column-gap: clamp(7px, 2.4vw, 10px);
  }
  .grain-faq__item.is-open .grain-faq__answer {
    grid-template-columns: 2rem 1fr;
    padding-top: min(2.0833333333vw, 12px);
  }
  .grain-faq__item.is-open .grain-faq__answer .grain-faq__a-badge {
    align-self: start;
  }
}


/* ---------- faq.html <head> 内のインラインstyleから移植（カテゴリボタン グリッド） ---------- */
.grain-faq .category {
  padding-top: 0;
}
.grain-faq .category__inner {
  width: min(76.3888888889vw, 1100px);
}
.grain-faq .category__list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  justify-content: start;
}
.grain-faq .category__item {
  width: 100%;
}
.grain-faq .grain-faq__panels {
  margin-top: 70px;
}
@media screen and (width < 768px) {
  .grain-faq .category__inner {
    width: 89.3333333333vw;
  }
  .grain-faq .category__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 15px;
  }
}

/* カテゴリボタン: FAQの長文ラベル対応（折り返し時にチェブロンと重ならないよう
   アイコンを通常フローに変更。.grain-faq 配下限定なので /aboutus/ には影響しない） */
.grain-faq .category__item {
  height: auto;
  min-height: 50px;
  padding: 10px 14px;
}
.grain-faq .category__item i {
  position: static;
  margin-right: 10px;
  flex-shrink: 0;
}
.grain-faq .category__item p {
  margin: 0;
  line-height: 1.5;
  text-align: left;
}
@media screen and (width < 375px) {
  .grain-faq .category__item {
    padding: 8px 10px;
  }
  .grain-faq .category__item i {
    margin-right: 6px;
  }
}