/* 画面幅ごとのレイアウト最適化 */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 > :last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-body {
    padding-left: 24px;
    text-align: left;
    border-left: none;
  }

  .nav-header {
    flex-wrap: wrap;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav-list {
    flex-wrap: wrap;
    gap: 16px 24px;
    padding-bottom: 16px;
  }

  .js-enabled .nav-header {
    flex-wrap: nowrap;
  }

  .js-enabled .nav-toggle {
    display: inline-flex;
  }

  .js-enabled .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    height: calc(100dvh - var(--header-height));
    z-index: 19;
    width: min(60vw, 280px);
    padding: 32px var(--padding-mobile);
    overflow-y: auto;
    background: var(--color-white);
    box-shadow: -4px 0 24px var(--color-shadow-soft);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate3d(100%, 0, 0);
    transition:
      opacity var(--transition-base),
      transform var(--transition-base),
      visibility var(--transition-base);
  }

  .js-enabled .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate3d(0, 0, 0);
  }

  .js-enabled .site-nav-list {
    width: min(100%, var(--container-width));
    margin-inline: auto;
    padding-block: 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-3 > :last-child:nth-child(odd) {
    grid-column: auto;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .section-intro {
    margin-bottom: 40px;
  }

  .section-intro p {
    margin-top: 20px;
  }

  #hero {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 80px;
  }

  .hero-content {
    gap: 20px;
  }

  /* ヒーロータイトル：モバイルで見切れないよう調整 */
  .scroll-video-section .hero-content h1 {
    font-size: clamp(1.75rem, 8.5vw, 2.5rem);
    word-break: normal;
    overflow-wrap: break-word;
    line-break: strict;
    line-height: 1.25;
  }

  /* 見出し全般：禁則処理（句読点の行頭禁止）を守って折り返す */
  h1, h2 {
    word-break: normal;
    overflow-wrap: break-word;
    line-break: strict;
  }

  /* モバイル専用改行を有効化 */
  .br-mobile {
    display: inline;
  }

  .scroll-video-sticky .container {
    padding-inline: var(--padding-mobile);
    box-sizing: border-box;
  }

  .scroll-indicator {
    display: none;
  }

  .philosophy-body {
    padding-left: 0;
    text-align: left;
  }

  .footer-layout {
    grid-template-columns: 1fr;
  }

  .news-item {
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 12px;
  }

  .news-item a {
    width: 100%;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-outline {
    width: 100%;
    min-width: 0;
  }

  .site-footer {
    padding-block: 64px;
  }

  .contact-info-grid {
    grid-template-columns: 1fr;
  }

  .contact-hero {
    padding-top: calc(var(--header-height) + 48px);
  }

  .contact-lead br {
    display: none;
  }
}