/* ============================================
   s-nav-04 - Section Nav (セクションナビ・自動生成)
   ============================================ */
.s-nav-04 {
  container-type: inline-size;
  background-color: var(--color-bg);
  border-bottom: 1px solid transparent;
  position: sticky;
  top: var(--site-header-current-bottom, 0);
  /* 固定フッターCTA（70）より下、通常コンテンツより上に置く。 */
  z-index: 60;
  width: 100vw;
  max-width: none;
  margin-inline: calc(50% - 50vw);
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  padding-block: var(--space-5-xl);
  opacity: 1;
  visibility: visible;
  transition:
    opacity var(--transition-normal),
    visibility var(--transition-normal),
    padding var(--transition-normal),
    background-color var(--transition-normal),
    border-color var(--transition-normal);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.s-nav-04.is-section-nav-stuck {
  padding-block: 0;
  background: color-mix(in srgb, var(--color-white) 82%, transparent);
  border-bottom-color: color-mix(in srgb, var(--color-border) 70%, transparent);
  -webkit-backdrop-filter: blur(var(--space-lg)) saturate(1.15);
  backdrop-filter: blur(var(--space-lg)) saturate(1.15);
}

.s-nav-04.is-section-nav-hidden {
  display: none;
}

.s-nav-04::-webkit-scrollbar {
  display: none;
}

/* s-layout-04 の本文直下幅制限より詳細度を上げ、画面端まで広げる。 */
.s-base-02 .entry-content > .s-nav-04 {
  width: 100vw;
  max-width: none;
  margin-inline: calc(50% - 50vw);
  padding-inline: 0;
}

.s-nav-04__wrap {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 0;
  width: var(--width-inner);
  min-width: max-content;
  max-width: 100%;
  box-sizing: border-box;
  margin: 0 auto;
  padding-inline: var(--container-padding);
}

.s-nav-04__item {
  display: inline-flex;
  flex: 1 0 max-content;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-width: var(--content-width-xs);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-family-body);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid var(--color-primary-light);
  transition:
    opacity var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal);
  line-height: var(--line-height-compact);
}

.s-nav-04__item::after {
  content: "";
  flex-shrink: 0;
  display: inline-block;
  width: var(--font-size-3-xs);
  height: var(--font-size-3-xs);
  background-color: currentColor;
  -webkit-mask: url("../../images/icon/icon--arrow-nav-01.svg") no-repeat center / contain;
  mask: url("../../images/icon/icon--arrow-nav-01.svg") no-repeat center / contain;
}

.s-nav-04__item:hover {
  opacity: 0.7;
}

.s-nav-04.is-section-nav-stuck .s-nav-04__wrap {
  justify-content: center;
  width: max-content;
  min-width: 100%;
  max-width: none;
}

.s-nav-04.is-section-nav-stuck .s-nav-04__item {
  flex: 0 0 auto;
  min-width: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  border-bottom-color: transparent;
}

.s-nav-04.is-section-nav-stuck .s-nav-04__item::after {
  display: none;
}

.s-nav-04.is-section-nav-stuck .s-nav-04__item:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-border);
}

.s-nav-04.is-section-nav-stuck .s-nav-04__item--active {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* --- Responsive --- */
@media (min-width: 768px) {
  .s-nav-04:not(.is-section-nav-stuck) .s-nav-04__wrap {
    display: grid;
    grid-template-columns: repeat(
      auto-fit,
      minmax(min(100%, var(--card-md)), 1fr)
    );
    width: var(--width-inner);
    min-width: 0;
    max-width: 100%;
  }

  .s-nav-04:not(.is-section-nav-stuck) .s-nav-04__item {
    min-width: 0;
  }
}

@media (max-width: 599px) {
  .s-nav-04 {
    padding-block: var(--space-xl);
  }

  .s-nav-04__item {
    flex: 0 0 auto;
    min-width: 0;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-xs);
  }

  .s-nav-04.is-section-nav-stuck {
    padding-block: 0;
  }
}