.mobile-menu-toggle {
  display: none;
}

.mobile-header-links {
  display: contents;
}

@media (max-width: 768px) {
  html.mobile-header-ready [data-mobile-header] {
    position: relative;
    z-index: 2000;
    align-items: center;
    flex-wrap: nowrap !important;
  }

  html.mobile-header-ready [data-mobile-menu] {
    display: none !important;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 2001;
    width: min(320px, 100%);
    max-width: 100%;
    box-sizing: border-box;
    padding: 10px;
    gap: 6px !important;
    background: var(--paper, #fff);
    border: 1px solid var(--line, var(--mist, #d9e4eb));
    border-radius: var(--r-lg, 16px);
    box-shadow: 0 18px 42px rgba(10, 35, 57, 0.2);
  }

  html.mobile-header-ready [data-mobile-menu].is-open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
  }

  html.mobile-header-ready [data-mobile-menu] a {
    display: flex !important;
    align-items: center;
    justify-content: flex-start !important;
    width: 100% !important;
    min-height: 44px;
    box-sizing: border-box;
    margin: 0 !important;
    padding: 11px 14px !important;
    color: var(--navy, var(--deep, #153754)) !important;
    background: rgba(217, 228, 235, 0.25);
    border: 0 !important;
    border-radius: var(--r-md, 10px) !important;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    text-align: left !important;
    text-decoration: none;
  }

  html.mobile-header-ready [data-mobile-menu] a:hover,
  html.mobile-header-ready [data-mobile-menu] a:focus-visible {
    background: rgba(63, 182, 230, 0.14);
  }

  html.mobile-header-ready [data-mobile-menu] a.pill,
  html.mobile-header-ready [data-mobile-menu] a.solid {
    color: #fff !important;
    background: var(--orange, var(--accent, #3e9a80)) !important;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    flex: 0 0 44px;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 0;
    color: var(--navy, var(--deep, #153754));
    background: var(--paper, #fff);
    border: 1px solid var(--line, var(--mist, #d9e4eb));
    border-radius: var(--r-md, 12px);
    box-shadow: 0 4px 14px rgba(10, 35, 57, 0.1);
    font: inherit;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
  }

  .mobile-menu-toggle:hover {
    background: var(--foam, #f2f7fa);
  }

  .mobile-menu-toggle:focus-visible {
    outline: 3px solid var(--orange, var(--accent, #3e9a80));
    outline-offset: 2px;
  }

  .mobile-menu-toggle[aria-expanded="true"] {
    color: #fff;
    background: var(--orange, var(--accent, #3e9a80));
    border-color: transparent;
  }

  html.mobile-header-ready [data-mobile-header="chapter"] .mobile-menu-toggle {
    color: #f6f1e7;
    background: rgba(246, 241, 231, 0.08);
    border-color: rgba(246, 241, 231, 0.22);
    box-shadow: none;
  }

  html.mobile-header-ready [data-mobile-header="chapter"] .mobile-menu-toggle[aria-expanded="true"] {
    color: #0a0e1c;
    background: #f6f1e7;
  }

  /* 3Dの回転が未表示セクションを約1px横へ膨らませるため、
     モバイルだけ同じ縦リビールを2D移動で行う。 */
  [data-page] {
    transform: translateY(46px);
  }

  [data-page].is-in {
    transform: none;
  }
}