/* ------------------------------
  研究開発・品質管理ページ専用スタイル
  （共通ヘッダー／フッター／SubPageHero／CTAは style.css を参照）
------------------------------ */

.section-heading {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: max(1.75rem, 24px);
  font-weight: 700;
  text-align: center;
  color: var(--color-primary-dark);
}

.section-heading::after {
  width: 2.75rem;
  height: 0.1875rem;
  margin-top: 1rem;
  border-radius: 0.125rem;
  background-color: var(--color-primary);
  content: "";
}

.section-heading--left {
  align-items: flex-start;
  text-align: left;
}

.section-heading--left::after {
  margin-left: 0;
}

/* ページ内ナビゲーション */
.page-nav {
  position: sticky;
  top: 6.25rem;
  z-index: 40;
  margin-top: 1.5rem;
  background-color: #fff;
  border-bottom: 1px solid #dbe5ee;
}

.page-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  max-width: 84rem;
  margin: 0 auto;
  padding: 0 3rem;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.page-nav__list::-webkit-scrollbar {
  display: none;
}

.page-nav__list li {
  flex-shrink: 0;
}

.page-nav__list a {
  display: flex;
  align-items: center;
  height: 3.5rem;
  padding: 0 0.125rem;
  border-bottom: 2px solid transparent;
  font-size: max(0.875rem, 12px);
  font-weight: 600;
  color: var(--color-text-light);
  transition: color 0.3s, border-color 0.3s;
}

@media (any-hover: hover) {
  .page-nav__list a:hover {
    color: var(--color-primary);
    opacity: 1;
  }
}

/* 冒頭リード文 */
.page-intro {
  max-width: 84rem;
  margin: 3rem auto 0;
  padding: 0 3rem;
  font-size: max(0.875rem, 12px);
  font-weight: 500;
  line-height: 1.9;
  color: var(--color-text-light);
}

/* セクション共通 */
.page-section {
  padding: 5rem 3rem;
  scroll-margin-top: 9.75rem;
}

.page-section--research {
  background-color: #fff;
}

.page-section--quality {
  background-color: #f2f7fc;
}

.page-section__label {
  display: block;
  text-align: center;
  font-size: max(0.8125rem, 11px);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-primary);
}

.page-section__text {
  max-width: 42rem;
  margin: 1rem auto 0;
  text-align: center;
  font-size: max(0.9375rem, 13px);
  font-weight: 500;
  line-height: 1.9;
  color: var(--color-text-light);
}

/* 特長カード */
.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  max-width: 84rem;
  margin: 3rem auto 0;
}

.feature-card {
  padding: 2.25rem 1.75rem;
  border: 1px solid #dbe5ee;
  border-radius: 0.75rem;
  background-color: #fff;
  text-align: center;
}

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto;
  border-radius: 50%;
  background-color: #eef4fb;
}

.feature-card__icon svg {
  width: 1.75rem;
  height: 1.75rem;
}

.feature-card__title {
  margin-top: 1.25rem;
  font-size: max(1.0625rem, 15px);
  font-weight: 700;
  color: var(--color-primary-dark);
}

.feature-card__text {
  margin-top: 0.875rem;
  font-size: max(0.8125rem, 12px);
  font-weight: 500;
  line-height: 1.85;
  color: var(--color-text-light);
}

/* ------------------------------
  レスポンシブ
------------------------------ */
@media screen and (max-width: 1199px) {
  .page-nav__list {
    justify-content: center;
    gap: 1.75rem;
    padding: 0 2rem;
  }

  .page-intro,
  .page-section {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media screen and (max-width: 959px) {
  .page-nav {
    top: 74px;
  }

  .page-section {
    scroll-margin-top: 130px;
  }
}

@media screen and (max-width: 767px) {
  .page-section {
    scroll-margin-top: 118px;
  }

  .page-intro {
    padding: 0 1.25rem;
    font-size: 0.8125rem;
  }

  .page-section {
    padding: 3rem 1.25rem;
  }

  .section-heading {
    font-size: 1.375rem;
  }

  .page-nav__list {
    justify-content: flex-start;
    gap: 1.25rem;
    padding: 0 1.25rem;
  }

  .page-nav__list a {
    height: 2.75rem;
    font-size: 0.8125rem;
  }

  .feature-list {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-top: 2rem;
  }

  .feature-card {
    padding: 1.75rem 1.25rem;
  }
}