html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  background-color: #efebe7;
  font-family:
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic",
    "YuGothic", "Meiryo", "Helvetica Neue", Arial, sans-serif;
  /* Disable pull-to-refresh on mobile browsers */
  overscroll-behavior-y: none;
}

body {
  overflow: hidden;
}

#zoomWrapper {
  flex: 1;
  width: 100%;
  height: 100%;
  overflow: auto;
  touch-action: pan-x pan-y;
}

#zoomRoot {
  width: 100%;
  height: 100%;
  position: relative;
}

#zoomContent {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  transform-origin: top center;
  margin-left: auto;
  margin-right: auto;
}

:root {
  /* 画像のズーム幅（連続・単一どちらもこれを参照） */
  --img-zoom: 90%;
  /* ページ左右の余白量（px）。JSで1200px→4%、1600px→38%の割合から計算して代入 */
  --page-side-gap: 0px;
  --header-height: 56px;
  --footer-height: 48px;
  --single-bottom-space: 5px;
  --single-text-min: 130px;
  --single-grid-height: calc(
    100vh - var(--header-height) - var(--footer-height)
  );
  --single-inline-gap: clamp(24px, 5vw, 160px);
  --single-page-padding-inline: clamp(16px, 3vw, 64px);
  --single-page-padding-block: clamp(32px, 5vh, 100px);
  --single-page-gap: clamp(16px, 2vw, 32px);
  --single-page-max-width: calc(100% - (var(--single-inline-gap) * 2));
  --mobile-modal-scale: 1.55;
  --mobile-share-scale: 1;
  --banner-gap: 108px;
  --banner-margin-vertical: 59px;
}

h1 {
  font-size: 1em;
}

.header,
.footer {
  height: 50px;
  background: #333;
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 1rem;
  flex-shrink: 0;
  z-index: 2000;
}

.layout {
  flex: 1;
  display: flex;
  overflow: hidden;
  margin-top: 56px;
  /* ヘッダーの高さぶんずらす */
}

/* sidebar のアニメーションだけで閉開を制御 */
:root {
  --sidebar-width: clamp(190px, 14vw, 420px);
}

.sidebar {
  position: relative;
  width: var(--sidebar-width);
  background: #e8e4e0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform 0.3s ease;
  will-change: transform;
}

.sidebar.collapsed {
  transform: translateX(calc(-1 * (var(--sidebar-width) + 20px)));
}

body.help-open #sidebar,
body.help-open #sidebarCollapsedBtn {
  display: none !important;
}

body.help-open .layout {
  justify-content: center;
}

body.help-open .snap-viewer {
  width: 100%;
  max-width: none;
  padding-left: clamp(16px, 5vw, 64px);
  padding-right: clamp(16px, 5vw, 64px);
  margin-left: 0;
}

body.help-open .page {
  width: min(1200px, 100%);
  margin-left: auto;
  margin-right: auto;
}

body.help-open .footer {
  left: 0 !important;
  width: 100% !important;
}

body.help-open .footer-toc-btn.mode-toggle {
  visibility: hidden;
}

body.help-open .footer-toc-btn[data-footer-action="display"] {
  visibility: hidden;
}

/* サイドバーが閉じたときにメインを拡張 */
.layout.sidebar-hidden .snap-viewer {
  flex: 1;
  width: 100%;
  transition: width 0.3s ease;
}

.snap-viewer {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  background: #fafafa;
}

.snap-viewer:not(.content-page) {
  scrollbar-width: none;      /* Firefox */
  -ms-overflow-style: none;   /* IE/old Edge */
}

.snap-viewer:not(.content-page)::‑webkit‑scrollbar {
  display: none;              /* Chrome, Safari, Opera */
}

.snap-viewer.content-page {
  scrollbar-width: auto;      /* Firefox */
  -ms-overflow-style: auto;   /* IE/old Edge */
}

.snap-viewer.content-page::‑webkit‑scrollbar {
  width: 8px;
}

.snap-viewer.content-page::‑webkit‑scrollbar-track {
  background: #f0f0f0;
}

.snap-viewer.content-page::‑webkit‑scrollbar-thumb {
  background: #bbb;
  border-radius: 4px;
}

.snap-viewer:not(.continuous) {
  overflow-y: hidden;
}

.snap-viewer.content-page,
.thumbnail-page {
  overflow-y: auto;
}

.page {
  margin-bottom: calc(2rem + 8px);
}

/* ===== スライド画像下に追従する半円（chevron） ===== */
.page img {
  position: relative;
  width: var(--img-zoom);
  /* ズームは幅%で管理（レイアウトに反映） */
  display: block;
  margin: 0 auto;
  box-shadow: 5px 7px 12px rgba(0, 0, 0, 0.2);
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* ===== OCRテキストボックス（左右分割レイアウト） ===== */
/* 展開前は半透明に */
.ocr-container {
  display: flex;
  align-items: flex-start;
  width: 80%;
  background: #fff;
  border-radius: 8px;
  margin-top: 16px;
  overflow: hidden;
  opacity: 0.5;
  transition: opacity 0.3s ease;
  position: relative;
}

/* 展開時に不透明に */
.ocr-container.open {
  opacity: 1;
}

#viewer:not(.continuous) .ocr-container.open {
  margin-bottom: 2px;
}

.ocr-left {
  flex-shrink: 0;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  padding: 10px 12px;
  position: relative;
}

.ocr-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 10px 10px 10px 0px;
  overflow: hidden;
  transition:
    max-height 0.4s ease,
    color 0.3s ease;
  min-height: 2.4em;
  max-height: 4em;
}

.ocr-container.open .ocr-right {
  max-height: 800px; /* 展開時は可変 */
  min-height: unset;

}

.ocr-header {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
}

.ocr-container.open .ocr-header {
	padding-top: 8px;
	line-height: 1.8;
}

.ocr-chevron {
  width: 12px;
  height: 12px;
  background: url("assets/chevron.svg") no-repeat center;
  background-size: contain;
  transition: transform 0.3s ease;
  margin-left: 5px;
}

.ocr-container.open .ocr-chevron {
  transform: rotate(90deg);
}
.ocr-tooltip-trigger {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: rgba(104, 104, 104, 0.77);
  color: #fff;
  font-size: 12px;
  padding: 6px 10px;
  border: 0;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  cursor: pointer;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 20;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.25));
}

.ocr-container:not(.open):hover .ocr-tooltip-trigger,
.ocr-container:not(.open):focus-within .ocr-tooltip-trigger {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%);
}

#viewer.continuous .ocr-tooltip-trigger {
  display: none;
}

.ocr-box {
  font-size: 12px;
  color: #888;
  line-height: 1.6;
  transition:
    color 0.3s ease,
    font-size 0.3s ease;
  max-height: var(--ocr-collapsed-height);
  overflow: hidden;
}

.ocr-container.open .ocr-box {
  font-size: 14px;
  line-height: 2.1;
  padding: 8px 10px 0px 4px;
  color: #000;
  max-height: var(--ocr-expanded-height);
  overflow-y: auto;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
}

.ocr-box p {
  margin: 0;
}

.ocr-note {
  display: none;
  text-align: right;
  color: #a8a8a8;
  font-size: 12px;
  line-height: 1.6;
}

.ocr-note::before {
  content: "\A";
  white-space: pre;
  display: block;
}

.ocr-container.open .ocr-note {
  display: block;
  margin: 11px 0 3px 0;
}

.sidebar-toggle,
.sidebar-collapsed-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.sidebar-toggle img,
.sidebar-collapsed-btn img {
  width: 28px;
  height: 28px;
  display: block;
}

.thumb {
  display: flex;
  align-items: flex-start;
  /* 上揃え */
  gap: 6px;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.thumb-number {
  width: 24px;
  text-align: right;
  font-size: 12px;
  color: #555;
  flex-shrink: 0;
}

.thumb img {
  width: 80%;
  display: block;
  margin: 0 auto;
}

/* サイドバーが閉じたときだけ開くアイコンを表示 */
.sidebar-collapsed-btn {
  display: none;
}

.sidebar.collapsed ~ .sidebar-collapsed-btn {
  display: block !important;
}

/* ===== メインビューア：1ページずつ表示する設定 ===== */
.snap-viewer {
  flex: 1;
  overflow-y: auto;
  scroll-snap-type: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #efebe7;
  padding: 40px 0;
}

.page {
  scroll-snap-align: unset;
  max-width: none;
  width: min(100%, calc(100vw - var(--page-side-gap)));
  margin: 40px 2%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: #fbfbfb;
  display: flex;
  align-items: center;
  padding: 0 20px;
  font-size: 14px;
  color: #555;
  z-index: 4000;
  border-bottom: 1px solid #eeeeee;
}

.header-desktop {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 24px;
  height: 100%;
}

.header-mobile {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
}

.mobile-menu-toggle {
  position: absolute;
  top: 6px;
  right: 12px;
  z-index: 5000;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: rgba(255, 255, 255, 0.96);
  border-radius: 10px;
  padding: 0;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
  transition:
    box-shadow 0.2s ease,
    transform 0.2s ease;
}

.mobile-menu-toggle:hover {
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  transform: translateY(-1px);
}

.mobile-menu-toggle:active {
  transform: translateY(0);
}

.mobile-menu-toggle.position-top-right {
  position: absolute;
  top: 6px;
  right: 12px;
  bottom: auto;
}

.mobile-menu-toggle.position-bottom-right {
  position: fixed;
  top: auto;
  bottom: 24px;
  right: 16px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.25);
}

.mobile-menu-line {
  width: 24px;
  height: 3px;
  background: #333;
  border-radius: 2px;
  transition:
    transform 0.3s ease,
    opacity 0.3s ease;
}

.mobile-menu-line + .mobile-menu-line {
  margin-top: 5px;
}

.mobile-menu-toggle.open .mobile-menu-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.open .mobile-menu-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.open .mobile-menu-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-slide-title {
  margin: 0;
  flex: 1;
  text-align: center;
  font-size: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.slide-title {
  font-weight: 600;
  max-width: 320px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: pointer;
}

.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-total {
  display: inline-flex;
  min-width: 48px;
  justify-content: flex-start;
  white-space: nowrap;
}

.page-input {
  width: 32px;
  text-align: center;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 17px;
  padding: 2px;
  color: #686868;
}

.page-dropdown {
  position: relative;
  display: inline-block;
  --page-label-area: 56px;
  cursor: pointer;
}

.page-dropdown:hover .page-label {
  background: #f5f5f5;
}

.page-label {
  display: flex;
  align-items: center;
  gap: 4px;
  color: #555;
  font-size: 13px;
  white-space: nowrap;
  padding: 10px 20px;
}

.page-label::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: url("assets/chevron.svg") no-repeat center;
  background-size: contain;
  transform: rotate(90deg);
  transition: transform 0.2s ease;
}

.page-dropdown.active .page-label::after {
  transform: rotate(-90deg);
}

.page-menu {
  position: absolute;
  top: 120%;
  left: 0;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 8px 0;
  display: none;
  min-width: 80px;
  max-height: 300px;
  overflow-y: auto;
  z-index: 4100;
}

.page-dropdown.active .page-menu {
  display: block;
}

.page-option {
  padding: 8px 16px;
  font-size: 13px;
  color: #333;
  cursor: pointer;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.page-option:hover {
  background: #f2f2f2;
  color: #000;
}

.page-select option {
  color: #333;
  /* 展開時のリスト内の数字を表示 */
}

.page-select:focus,
.page-select:hover {
  color: transparent;
  /* 展開時もセレクトボックス部分は透明 */
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.mobile-menu-overlay {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 3998;
}

.mobile-menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu {
  position: fixed;
  top: 56px;
  right: 0;
  bottom: 0;
  width: 280px;
  background: #fff;
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.15);
  transform: translateX(110%);
  transition: transform 0.3s ease;
  z-index: 3999;
  overflow-y: auto;
  padding: 32px 20px;
  display: none;
}

.mobile-menu.open {
  display: block;
  transform: translateX(0);
}

.mobile-menu-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-menu-list > li {
  border-bottom: 1px solid #f0f0f0;
  padding-bottom: 12px;
}

.mobile-menu-list > li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.mobile-menu-link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  width: 100%;
  background: none;
  border: none;
  padding: 0;
  color: #333;
  font-size: 16px;
  text-decoration: none;
  cursor: pointer;
}

.mobile-menu-link span {
  flex: 1;
  text-align: left;
}

.mobile-menu button.mobile-menu-link {
  font-family: inherit;
}

.mobile-menu-link:hover {
  color: #000;
}

.mobile-menu-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.mobile-menu-footer {
	margin-top: 36px;
}

.mobile-submenu {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-submenu-toggle {
  position: relative;
  padding-right: 28px;
}

.mobile-submenu-toggle::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  background: url("assets/chevron.svg") no-repeat center;
  background-size: contain;
  transition: transform 0.2s ease;
}

.mobile-submenu.open .mobile-submenu-toggle::after {
  transform: translateY(-50%) rotate(-90deg);
}

.mobile-submenu-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 12px;
  display: none;
  gap: 8px;
  flex-direction: column;
}

.mobile-submenu.open .mobile-submenu-list {
  display: flex;
}

.mobile-submenu-list li:first-child {
  margin-top: 10px;
}

.mobile-submenu-list a {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  font-size: 14px;
  color: #555;
  gap: 8px;
  padding: 6px 0;
  text-decoration: none;
}

.mobile-submenu-list a img {
  width: 14px;
  height: 14px;
  margin-right: 6px;
}

body.mobile-menu-open {
  overflow: hidden;
}

.header-item img {
  width: 25px;
  height: 25px;
}

.header-item[data-tooltip]::after,
.header-item[data-tooltip]::before {
  content: none;
}

.header-menu {
  position: absolute;
  top: 120%;
  right: 0;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 12px 21px;
  display: none;
  min-width: 220px;
  z-index: 4100;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.header-item.active .header-menu {
  display: block;
}

@media (max-width: 1112px) {
  .header-desktop .header-item {
    gap: 0;
    padding: 6px;
  }

  .header-desktop .header-item > span {
    display: none;
  }

  .header-item[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translate(-50%, -6px);
    background: rgba(80, 80, 80, 0.95);
    color: #fff;
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition:
      opacity 0.2s ease,
      transform 0.2s ease;
    z-index: 4050;
  }

  .header-item[data-tooltip]::before {
    content: "";
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translate(-50%, -6px);
    border: 6px solid transparent;
    border-bottom-color: rgba(80, 80, 80, 0.95);
    opacity: 0;
    transition:
      opacity 0.2s ease,
      transform 0.2s ease;
    z-index: 4049;
  }

  .header-item[data-tooltip]:hover::after,
  .header-item[data-tooltip]:hover::before,
  .header-item[data-tooltip]:focus-within::after,
  .header-item[data-tooltip]:focus-within::before {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* ===== サイドバーサムネイルのハイライト＆レイアウト修正 ===== */
/* ===== サイドバーのサムネイル配置修正（ページ番号を下に） ===== */
.thumbnail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 4px;
  cursor: pointer;
  padding: 6px 0;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.thumbnail img {
  width: 80%;
  height: auto;
  display: block;
  border-radius: 3px;
  border: 1px solid #ccc;
  transition: transform 0.2s ease;
}

.thumbnail.active {
  background: #fbfaf9;
}

.thumb-number {
  font-size: 12px;
  color: #333;
  text-align: center;
  width: 100%;
}

.thumbs {
  margin-left: 5px;
}

/* ===== フッター ===== */
.footer {
  position: fixed;
  bottom: 0;
  left: var(--sidebar-width);
  right: 0;
  height: 48px;
  background: #fbfbfb;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2100;
  transition:
    left 0.3s ease,
    width 0.3s ease; /* アニメーション追加 */
}

.footer-inner {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  column-gap: clamp(12px, 2vw, 32px);
  position: relative;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: center;
  /* コンテンツを中央寄せ */
}

.footer-icon img {
  width: 25px;
  height: 25px;
  cursor: pointer;
}

.footer-right {
  grid-column: 3;
  position: relative;
  justify-self: end;
  font-size: 13px;
  font-weight: 600;
  color: #777;
  white-space: nowrap;
  padding-left: clamp(12px, 2vw, 32px);
}

.footer-brand {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
  opacity: 0.5;
}

.footer-brand:hover,
.footer-brand:focus-visible,
.footer-brand:active {
  color: inherit;
  outline: none;
  opacity: 1;
}

.footer-toc-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(4px, 1.5vw, 12px);
  flex-wrap: nowrap;
  grid-column: 2;
  justify-self: center;
  position: static;
  top: auto;
  left: auto;
  transform: none;
  width: fit-content;
  max-width: 100%;
}

.footer-toc-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 6px;
  border: none;
  background: #fbfbfb;
  font-size: 13px;
  color: #555;
  cursor: pointer;
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  white-space: nowrap;
}

.footer-toc-btn img {
  width: 21px;
  height: 21px;
}

.footer-toc-btn[data-footer-action="home"] img {
  width: 25px;
  height: 25px;
}

.footer-toc-btn[data-footer-action="thumb"] img {
  width: 23px;
  height: 23px;
}

.footer-toc-btn span {
  line-height: 1;
}

@media (max-width: 1180px) {
  .footer-inner {
    width: calc(100% - 24px);
    column-gap: clamp(10px, 1.6vw, 24px);
  }

  .footer-toc-links {
    gap: clamp(4px, 1.2vw, 10px);
  }

  .footer-toc-btn {
    padding: 5px 9px;
    gap: 4px;
  }
}

@media (max-width: 980px) {
  .footer-toc-btn {
    padding: 4px 7px;
    font-size: 11px;
    gap: 4px;
  }

  .footer-toc-btn img {
    width: 20px;
    height: 20px;
  }

  .footer-toc-btn span {
	  display: none;
  }

  .footer-right {
    font-size: 12px;
    padding-left: 10px;
  }
}

.footer-toc-btn:hover,
.footer-toc-btn:focus-visible {
  background: #f6f6f6;
  outline: none;
}

body.toc-open .footer-toc-btn[data-footer-action="toc"] {
  background: #e8e8e8;
  color: #222;
  pointer-events: none;
  cursor: default;
}

body.toc-open .footer-toc-btn[data-footer-action="toc"] span {
  color: #222;
}

body.thumb-open .footer-toc-btn[data-footer-action="thumb"] {
  background: #e8e8e8;
  color: #222;
  pointer-events: none;
  cursor: default;
}

body.thumb-open .footer-toc-btn[data-footer-action="thumb"] span {
  color: #222;
}

body.toc-open .footer-toc-btn[data-footer-action="display"],
body.thumb-open .footer-toc-btn[data-footer-action="display"] {
  visibility: hidden;
  pointer-events: none;
}

/* ===== サイドバー調整 ===== */

.sidebar-header {
  padding: 10px;
}

/* サイドバータイトル */
.sidebar-header span,
.sidebar-title {
  font-size: 12px;
  color: #555;
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* サイドバー開閉アイコン */
#toggleSidebar {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 24px;
  height: 24px;
  transform: scale(0.8);
  /* サイズ80% */
  cursor: pointer;
  transition: opacity 0.2s ease;
}

#toggleSidebar:hover {
  opacity: 0.7;
}

/* サイドバーのスクロールバー */
#sidebar::-webkit-scrollbar {
  width: 6px;
}

#sidebar::-webkit-scrollbar-track {
  background: transparent;
}

#sidebar::-webkit-scrollbar-thumb {
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 3px;
}

#sidebar {
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

/* ===== サイドバー閉じたときの再表示ボタン ===== */
#sidebarCollapsedBtn {
  position: fixed;
  top: 64px;
  left: 10px;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

#sidebarCollapsedBtn img {
  width: 23px;
  height: 23px;
  display: block;
}

/* # ===== フッター細部調整 ===== */
.footer-divider {
  width: 1px;
  height: 20px;
  background: #ddd;
  margin: 0 10px;
  z-index: 1000;
}

.footer-mode {
  display: flex;
  align-items: center;
  gap: 4px;
}

.footer-label {
  font-size: 13px;
  color: #555;
  margin-left: 5px;
}

.snap-viewer.continuous {
  scroll-snap-type: none;
  /* スナップスクロール無効化 */
}

.snap-viewer.continuous .page {
  margin-bottom: 20px; /* スライド間を詰める */
  max-width: none; /* ビューポート拡大時も伸び続けるよう制限を解除 */
  width: min(
    100%,
    calc(100vw - var(--page-side-gap))
  ); /* ビューポート基準で可変 */
}

.page-btns {
  display: inline-flex;
  border: 1px solid #ccc;
  border-radius: 4px;
  overflow: hidden;
  margin-left: 10px;
}

.page-btn {
  background: #fbfbfb;
  border: none;
  width: 36px;
  height: 28px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition:
    background 0.2s ease,
    opacity 0.2s ease;
  position: relative;
}

.page-btn:hover {
  background: #f5f5f5;
  opacity: 0.8;
}

/* 仕切り線 */
.page-btn + .page-btn::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: #ccc;
}

/* アイコン画像 */
.page-btn img {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

/* ===== ヘッダー上下ボタン矢印の角度調整 ===== */
.page-btn.down img {
  transform: rotate(90deg);
}

.page-btn.up img {
  transform: rotate(-90deg) !important;
}

/* ===== サイドバー閉じたときのフッター幅調整 ===== */
.sidebar.collapsed ~ .footer {
  left: 0;
  width: 100%;
}

/* ===== サイドバー閉じたときのフッター全幅化 ===== */
.footer.expanded {
  left: 0 !important;
  width: 100% !important;
  transition:
    left 0.3s ease,
    width 0.3s ease;
}

/* ===== フッターアイコンホバー ===== */
.footer-icon:hover {
  opacity: 0.5;
  transition: opacity 0.2s ease;
}

/* ===== モーダル共通 ===== */
.modal {
  position: fixed;
  top: 56px;
  /* ヘッダー下から開始 */
  left: 0;
  right: 0;
  bottom: 0;
  background: #efebe7;
  display: none;
  z-index: 2000;
  overflow-y: auto;
}

@media (max-width: 768px) {
  #helpModal .modal-content {
    padding: 40px 24px 32px;
    max-width: 95vw;
  }

  #helpModal .modal-close {
    top: 16px;
    right: 16px;
    font-size: 36px;
  }
}

.modal.active {
  display: block;
}

.modal-content {
  padding: 60px;
  max-width: 1000px;
  margin: 0 auto;
  color: #333;
}

.modal-close {
  position: absolute;
  top: 50px;
  right: 100px;
  font-size: 50px;
  border: none;
  background: none;
  cursor: pointer;
  color: #666;
}

.modal-close:hover {
  color: #000;
}

.mobile-modal .search-options {
  display: flex;
  gap: 16px;
  font-size: 14px;
}

.mobile-modal .search-options label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mobile-modal {
  --mobile-modal-effective-scale: calc(
    var(--mobile-modal-scale, 1) * var(--mobile-share-scale, 1)
  );
}

.mobile-modal .modal-content {
  max-width: min(600px, 100vw);
  padding: calc(32px * var(--mobile-modal-effective-scale))
    clamp(
      calc(16px * var(--mobile-modal-effective-scale)),
      calc(5vw * var(--mobile-modal-effective-scale)),
      calc(24px * var(--mobile-modal-effective-scale))
    );
}

.mobile-modal .modal-content h2 {
  font-size: calc(24px * var(--mobile-modal-effective-scale));
  margin-bottom: calc(20px * var(--mobile-modal-effective-scale));
}

.mobile-modal .modal-close {
  top: calc(16px * var(--mobile-modal-effective-scale));
  right: calc(24px * var(--mobile-modal-effective-scale));
  font-size: calc(32px * var(--mobile-modal-effective-scale));
}

.mobile-search-group {
  display: flex;
  flex-direction: column;
  gap: calc(12px * var(--mobile-modal-effective-scale));
  margin-bottom: calc(20px * var(--mobile-modal-effective-scale));
  width: 100%;
}

.mobile-search-group .search-input {
  width: calc(100% - (50px * var(--mobile-modal-effective-scale)));
  align-self: center;
  padding: calc(12px * var(--mobile-modal-effective-scale))
    calc(25px * var(--mobile-modal-effective-scale));
  border: calc(1px * var(--mobile-modal-effective-scale)) solid #cfcfcf;
  border-radius: calc(8px * var(--mobile-modal-effective-scale));
  font-size: calc(16px * var(--mobile-modal-effective-scale));
  background: #fff;
  box-shadow: inset 0 calc(1px * var(--mobile-modal-effective-scale))
    calc(2px * var(--mobile-modal-effective-scale)) rgba(0, 0, 0, 0.05);
}

.mobile-search-group .search-btn {
  align-self: flex-end;
  margin-right: calc(1px * var(--mobile-modal-effective-scale));
  margin-top: calc(13px * var(--mobile-modal-effective-scale));
  min-width: calc(112px * var(--mobile-modal-effective-scale));
  padding: calc(12px * var(--mobile-modal-effective-scale))
    calc(22px * var(--mobile-modal-effective-scale));
  border-radius: calc(8px * var(--mobile-modal-effective-scale));
  background: #444;
  color: #fff;
  font-size: calc(15px * var(--mobile-modal-effective-scale));
  font-weight: 600;
  border: calc(1px * var(--mobile-modal-effective-scale)) solid #3a3a3a;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 calc(6px * var(--mobile-modal-effective-scale))
    calc(12px * var(--mobile-modal-effective-scale)) rgba(0, 0, 0, 0.15);
  transition:
    transform 0.12s ease,
    box-shadow 0.12s ease,
    background 0.12s ease;
}

.mobile-search-group .search-btn:hover {
  background: #565656;
  box-shadow: 0 calc(8px * var(--mobile-modal-effective-scale))
    calc(16px * var(--mobile-modal-effective-scale)) rgba(0, 0, 0, 0.2);
}

.mobile-search-group .search-btn:active {
  transform: translateY(1px);
  box-shadow: 0 calc(4px * var(--mobile-modal-effective-scale))
    calc(9px * var(--mobile-modal-effective-scale)) rgba(0, 0, 0, 0.18);
}

.mobile-modal .share-section {
  margin-bottom: calc(10px * var(--mobile-modal-effective-scale));
}

.mobile-modal .share-section h4 {
  font-size: calc(13px * var(--mobile-modal-effective-scale));
  margin-bottom: calc(6px * var(--mobile-modal-effective-scale));
  color: #333;
}

.mobile-modal .share-icons {
  display: flex;
  align-items: center;
  gap: calc(10px * var(--mobile-modal-effective-scale));
}

.mobile-modal .share-link {
  display: flex;
  align-items: center;
  gap: calc(4px * var(--mobile-modal-effective-scale));
  font-size: calc(12px * var(--mobile-modal-effective-scale));
  color: #333;
  cursor: pointer;
  padding: calc(4px * var(--mobile-modal-effective-scale))
    calc(6px * var(--mobile-modal-effective-scale));
  border-radius: calc(6px * var(--mobile-modal-effective-scale));
  transition: background 0.2s ease;
}

.mobile-modal .share-link:hover,
.mobile-modal .share-icons img:hover {
  background: #e6e6e6;
  cursor: pointer;
}

.mobile-modal .share-link img {
  width: calc(14px * var(--mobile-modal-effective-scale));
  height: calc(14px * var(--mobile-modal-effective-scale));
}

.mobile-modal .share-link span {
  font-size: calc(14px * var(--mobile-modal-effective-scale));
}

.mobile-modal .share-icons > img {
  width: calc(25px * var(--mobile-modal-effective-scale));
  height: calc(25px * var(--mobile-modal-effective-scale));
}

.mobile-modal hr {
  border: none;
  border-top: calc(1px * var(--mobile-modal-effective-scale)) solid #e0e0e0;
  margin: calc(24px * var(--mobile-modal-effective-scale)) 0;
}

#mobileShareModal {
  --mobile-share-scale: calc(1.55 / var(--mobile-modal-scale, 1));
}

/* ===== 検索結果モーダル ===== */
.search-modal {
  overflow: hidden;
}

.search-modal .modal-content {
  width: min(720px, 100%);
  padding: 32px 40px;
  height: calc(100vh - 94px);
  max-height: none;
  display: flex;
  flex-direction: column;
  margin: 0 auto;
  box-sizing: border-box;
}

.search-modal .modal-close {
  top: 18px;
  right: 24px;
  color: #a2a2a2;
}

.search-modal-header h2 {
  margin: 0;
  font-size: 20px;
  color: #222;
}

.search-modal-summary {
  margin: 4px 0 24px;
  font-size: 15px;
  color: #333;
}

.search-results-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding-right: 6px;
}

.search-result-card {
  border: 1px solid #e1dfdb;
  border-radius: 10px;
  padding: 16px;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  transition:
    border 0.2s ease,
    box-shadow 0.2s ease;
}

.search-result-card:hover {
  border-color: #bdaf9d;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.search-result-head {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  flex-wrap: nowrap;
}

.search-result-page {
  font-size: 15px;
  font-weight: 600;
  color: #2c2c2c;
  width: 100px;
  min-width: 100px;
  height: 56px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  text-align: center;
}

.search-result-thumb {
  width: auto;
  max-width: 160px;
  height: 56px;
  object-fit: contain;
  border-radius: 4px;
  flex-shrink: 0;
  border: 1px solid #c5c5c5;
  background: #fff;
}

.search-result-text {
  font-size: 14px;
  line-height: 1.8;
  color: #444;
  margin: 0;
}

.search-results-empty {
  margin-top: 16px;
  font-size: 14px;
  color: #666;
}

.search-highlight {
  background: #ffe571;
  color: #000;
  padding: 0 2px;
  border-radius: 2px;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: inline-flex;
    box-shadow: none;
  }

  .header {
    padding: 0 16px;
  }

  .header-desktop {
    display: none !important;
  }

  .header-mobile {
    display: flex !important;
  }

  .mobile-slide-title {
    font-size: 15px;
    text-align: left;
  }

  .slide-title {
    max-width: none;
  }

  .mobile-menu {
    top: 56px;
    bottom: 0;
    width: min(320px, 85vw);
  }

  .sidebar,
  #sidebarCollapsedBtn {
    display: none !important;
  }

  .footer {
    display: none !important;
  }

  .snap-viewer {
    padding: 20px 0;
  }

  .mobile-menu-toggle.position-bottom-right {
    width: 56px;
    height: 56px;
    box-shadow: none;
    background: rgba(255, 255, 255, 0.98);
  }

  .mobile-menu-toggle.position-bottom-right .mobile-menu-line {
    width: 26px;
  }
}

body.ua-mobile .mobile-menu-toggle {
  display: inline-flex;
  box-shadow: none;
}

body.ua-mobile .header {
  padding: 0 16px;
}

body.ua-mobile .header-desktop {
  display: none !important;
}

body.ua-mobile .header-mobile {
  display: flex !important;
}

body.ua-mobile .mobile-slide-title {
  font-size: 15px;
  text-align: left;
}

body.ua-mobile .slide-title {
  max-width: none;
}

body.ua-mobile .mobile-menu {
  top: 56px;
  bottom: 0;
  width: min(320px, 85vw);
}

body.ua-mobile .sidebar,
body.ua-mobile #sidebarCollapsedBtn {
  display: none !important;
}

body.ua-mobile .footer {
  display: none !important;
}

body.ua-mobile .snap-viewer {
  padding: 20px 0;
}

body.ua-mobile .mobile-menu-toggle.position-bottom-right {
  width: 56px;
  height: 56px;
  box-shadow: none;
  background: rgba(255, 255, 255, 0.98);
}

body.ua-mobile .mobile-menu-toggle.position-bottom-right .mobile-menu-line {
  width: 26px;
}

body.ua-mobile.ua-landscape .header {
  height: 0;
  padding: 0;
  border: none;
}

body.ua-mobile.ua-landscape .header-desktop,
body.ua-mobile.ua-landscape .header-mobile .mobile-slide-title {
  display: none !important;
}

body.ua-mobile.ua-landscape .layout {
  margin-top: 0;
}

body.ua-mobile.ua-landscape .mobile-menu-toggle {
  display: inline-flex;
  position: fixed;
  bottom: 24px;
  right: 16px;
}

body.ua-mobile.ua-landscape #viewer {
  height: 100vh;
  padding: 10px 0;
}

body.ua-mobile.ua-landscape #viewer:not(.continuous) {
  transform: translateY(-15vh);
  padding-bottom: 25vh;
}

body.ua-mobile.ua-landscape .snap-viewer {
  padding: 10px 0;
}

body.ua-mobile.ua-landscape .page {
  margin: 0 auto 16px;
  display: flex;
  justify-content: center;
}

body.ua-mobile.ua-landscape .page img {
  max-height: calc(100vh - 200px);
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

/* ===== サムネイルモーダル用グリッド ===== */
.thumbnail-page  {
  margin-top: var(--header-height);
  margin-bottom: var(--footer-height);
}

@media (max-width: 768px) {
  .thumbnail-page {
    margin-bottom: 0;
  }
}

.thumbnail-page .thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  column-gap: 38px;
  row-gap: 39px;
  padding: 0 12% clamp(80px, 12vh, 160px);
  overflow: visible;
  align-items: start;
}

@media (max-width: 1000px) {
  .thumbnail-page .thumbnail-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 38px;
    row-gap: 39px;
    padding: 0 6% 20px;
  }
}

@media (max-width: 1000px) and (orientation: landscape) {
  .thumbnail-page .thumbnail-grid {
    padding: 0 8% 20px;
  }
}

.thumbnail-page .thumbnail-grid img {
  width: 100%;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.thumbnail-page .thumbnail-grid img:hover {
  opacity: 0.7;
}

/* ===== トースト通知 ===== */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 3000;
}

.toast.show {
  opacity: 1;
}

/* ===== サムネイルモーダルヘッダー ===== */
.thumbnail-page .thumbnail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 12.2% 0;
  margin: 56px 0;
}

.thumbnail-page .thumbnail-title {
  font-size: 18px;
  font-weight: 600;
  color: #636363;
}

.thumbnail-page .thumbnail-pagecount {
  font-size: 14px;
  color: #555;
}

/* ===== サムネイルモーダルグリッドとページ番号 ===== */
.thumbnail-page-content {
  max-width: none;
  width: 100%;
  padding: 40px 0 60px;
}

.thumbnail-page .thumbnail-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.thumbnail-page .thumbnail-thumb a {
  display: block;
  text-decoration: none;
  color: inherit;
}

.thumbnail-page .thumbnail-thumb img {
  width: 100%;
  height: auto;
  max-width: none;
  margin-bottom: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  display: block;
}

.thumbnail-page .thumbnail-thumb:hover {
  opacity: 0.8;
}

.thumbnail-page .thumbnail-thumb-number {
  display: block;
  font-size: 13px;
  color: #707070;
  margin-top: 4px;
}

.ocr-container {
  align-items: stretch;
}

/* hoverでふわっと表示 */
.footer-toc-btn:hover::after,
.footer-toc-btn:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}

/* ===== フッターのツールチップ位置修正版 ===== */
.footer-toc-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* テキストボックス部分 */
.footer-toc-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 130%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(80, 80, 80, 0.95);
  color: #fff;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
  z-index: 1000;
}

/* 下の三角部分 */
.footer-toc-btn[data-tooltip]::before {
  content: "";
  position: absolute;
  bottom: 122%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: rgba(80, 80, 80, 0.95);
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 999;
}

/* === 専用フッターツールチップ === */
.footer-tooltip {
  position: absolute;
  left: 0;
  top: 0;
  transform: translate(-50%, calc(-100% - 10px));
  background: #696969;
  color: #fff;
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.18s ease,
    transform 0.18s ease;
  z-index: 2000;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.25));
}

.footer-tooltip::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #696969;
}

.footer-tooltip.visible {
  opacity: 1;
  transform: translate(-50%, calc(-100% - 14px));
}

/* ===== スライド画像の上下ナビゲーションゾーン ===== */
/* ===== スライド画像の上下ナビゲーションゾーン修正版 ===== */
.page {
  position: relative;
}

/* スライド画像の上・下部分にだけ反応領域を作る */
.nav-zone {
  position: absolute;
  top: 0;
  height: 100%;
  width: 50%;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
  z-index: 5;
  /* OCRより背面に配置 */
}

.nav-zone.left {
  left: 0;
}

.nav-zone.right {
  right: 0;
}

/* 1枚ずつ表示モードのときだけ有効 */
#viewer:not(.continuous) .nav-zone {
  pointer-events: auto;
}

/* ホバー時にその領域だけアイコン表示 */
#viewer:not(.continuous) .nav-zone:hover {
  opacity: 1;
}

#viewer.first-page .page.active .slide-chevron-prev,
#viewer.first-page .page.active .nav-zone.left,
#viewer.last-page .page.active .slide-chevron-next,
#viewer.last-page .page.active .nav-zone.right {
  display: none !important;
  pointer-events: none !important;
}

.sidebar-resizer {
  position: absolute;
  top: 0;
  right: 0;
  width: 6px;
  height: 100%;
  cursor: ew-resize;
  background: transparent;
  z-index: 30;
}

/* ===== サイドバー幅に応じてサムネイル画像を可変 ===== */
.sidebar .thumb img,
.sidebar .thumbnail img {
  width: calc(100% - 20px);
  max-width: 100%;
  transition: width 0.1s ease;
}

/* ===== サムネイルモーダル：ページ番号表示 ===== */
.modal-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.modal-thumb img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s ease;
}

/* # ===== ヘッダー右側メニュー（アコーディオン風ドロップダウン） ===== */
.header-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 4px;
}

.header-item:hover {
  background: #f6f6f6;
  outline: none;
}

.header-item span {
  font-size: 13px;
  color: #555;
}

/* 目次メニュー */
.header-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.header-menu ul li {
  margin: 4px 0;
}

.header-menu ul li a {
  color: #333;
  text-decoration: none;
  font-size: 13px;
}

.header-menu ul li a:hover {
  text-decoration: underline;
}

/* TOC menu items (index-h, index-sh) */
.header-menu .index-h,
.header-menu .index-sh {
  margin: 0;
  padding: 6px 0;
  line-height: 1.5;
}

.header-menu .index-h a,
.header-menu .index-sh a {
  display: block;
  color: #333;
  text-decoration: none;
  font-size: 13px;
  padding: 2px 0;
  transition: color 0.2s ease;
}

.header-menu .index-h a:hover,
.header-menu .index-sh a:hover {
  color: #0066cc;
  text-decoration: underline;
}

.header-menu .index-sh {
  padding-left: 16px;
  font-size: 12px;
}

/* 表示設定メニュー */
.header-menu label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin: 4px 0;
  cursor: pointer;
}

/* ===== 検索メニュー ===== */
.header-menu .search-input {
  width: 260px;
  max-width: 100%;
  padding: 6px 6px 6px 0;
  border: none;
  border-bottom: 1px solid #a4a4a4;
  background: transparent;
  font-size: 15px;
  color: #333;
  margin-bottom: 10px;
}

.header-menu .search-input:focus {
  outline: none;
  border-bottom-color: #7d7d7d;
}

.header-item[data-menu="search"] .header-menu {
  display: none;
  flex-direction: column;
  align-items: flex-start;
}

.header-item[data-menu="search"].active .header-menu {
  display: flex;
}

.header-menu .search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: #555;
  font-size: 13px;
  cursor: pointer;
  padding: 4px 10px;
  margin-top: 6px;
  margin-bottom: 3px;
  border-radius: 6px;
  transition:
    background 0.2s ease,
    color 0.2s ease;
  align-self: flex-end;
}

.header-menu .search-btn:hover,
.header-menu .search-btn:focus-visible {
  background: #e5e5e5;
  color: #333;
}

.header-menu .search-options {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  color: #333;
}

.header-menu .search-options label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.header-menu .search-options input[type="radio"] {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid #ccc;
  border-radius: 50%;
  position: relative;
  cursor: pointer;
  transition: border 0.2s ease;
}

.header-menu .search-options input[type="radio"]:checked {
  border: 5px solid #333;
}

/* シェアメニュー */
.header-menu .share-section {
  margin-bottom: 10px;
}

.header-menu .share-section h4 {
  font-size: 13px;
  margin-bottom: 6px;
  color: #333;
}

.header-menu .share-icons {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-menu .share-link {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: #333;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.header-menu .share-link:hover {
  background: #e6e6e6;
}

.header-menu .share-link img {
  width: 14px;
  height: 14px;
}

.header-menu .share-icons img {
  padding: 4px;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.header-menu .share-icons img:hover {
  background: #e6e6e6;
}

/* 関連リンクメニュー */
.header-menu .related-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.header-menu .related-links li {
  margin: 6px 0;
}

.header-menu .related-links a {
  color: #333;
  text-decoration: none;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.header-menu .related-links a:hover,
.header-menu .related-links a:focus-visible {
  text-decoration: none;
  background: rgba(0, 0, 0, 0.05);
}

.header-menu .related-links img {
  width: 11px;
  height: 11px;
}

/* === ヘッダー右側メニューの位置調整（左寄せ3種） === */
.header-item[data-menu="toc"] .header-menu,
.header-item[data-menu="display"] .header-menu,
.header-item[data-menu="search"] .header-menu {
  left: 0;
  right: auto;
  transform: translateX(var(--header-menu-offset, 10px));
  /* ← 少し右に寄せる */
}

/* ===== 表示モーダルのチェック・アイコン・テキスト整列 ===== */
.display-option {
  display: flex;
  align-items: center;
  gap: 10px;
  /* アイコンとテキストの間隔 */
  padding: 6px 8px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.display-option:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* チェックマークの位置を左端に固定＆幅を揃える */
.display-option .checkmark {
  width: 18px;
  text-align: center;
  color: #333;
  font-weight: 600;
}

/* アイコンのサイズを統一 */
.display-option img {
  width: 20px;
  height: 20px;
  opacity: 0.8;
}

/* テキストのスタイル */
.display-option span:last-child {
  font-size: 13px;
  color: #333;
}

#viewer {
  transition: margin-left 0.3s ease;
  /* Disable pull-to-refresh on mobile browsers */
  overscroll-behavior-y: none;
}

#viewer:not(.continuous) {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: var(--single-grid-height);
  min-height: var(--single-grid-height);
  overflow: hidden;
  background: #efebe7;
  padding: clamp(16px, 3vw, 32px) 0;
  transition:
    padding 0.3s ease,
    margin-left 0.3s ease;
}

/* ===== サイドバー開閉時のsnap-viewer調整（最終安定版・JS制御型） ===== */
.snap-viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow-y: auto;
  background: #efebe7;
  padding: 40px 0;
  transition: all 0.3s ease;
}

/* サイドバー閉じたときに中央寄せ（CSSは補助的） */
.layout.sidebar-hidden .snap-viewer {
  align-items: center;
  justify-content: flex-start;
  transition: all 0.3s ease;
}

/* ページも中央寄せ */
.layout.sidebar-hidden .page {
  margin-left: auto;
  margin-right: auto;
}

.page-grid {
  width: 100%;
  margin: 0 auto;
  display: block;
}

.page-grid__slide,
.page-grid__text,
.page-grid__spacer {
  width: 100%;
  display: block;
}

.page-grid__spacer {
  display: none;
}

#viewer:not(.continuous) .page {
  position: relative;
  width: min(100%, var(--single-page-max-width));
  max-width: none;
  height: var(--single-grid-height);
  min-height: var(--single-grid-height);
  overflow-y: auto;
  overflow-x: hidden;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: var(--single-page-padding-inline);
  margin: 0 auto;
  gap: var(--single-page-gap);
  background: transparent;
  border-radius: 8px;
  scrollbar-width: none;
}

#viewer:not(.continuous) .page::-webkit-scrollbar {
  display: none;
}

#viewer:not(.continuous) .page.active {
  display: flex;
}

#viewer:not(.continuous) .page-grid {
  display: grid;
  grid-template-rows: auto minmax(0, auto) minmax(
      var(--single-bottom-space),
      1fr
    );
  row-gap: var(--single-page-gap);
  align-content: start;
}

#viewer:not(.continuous) .page.portrait-slide:not(.portrait-actual) {
  height: auto;
  min-height: auto;
}

#viewer:not(.continuous)
  .page.portrait-slide:not(.portrait-actual)
  .page-grid__slide {
  height: auto;
  align-items: flex-start;
}

#viewer:not(.continuous) .page.portrait-slide.ratio-four-thirds {
  height: var(--single-grid-height);
  min-height: var(--single-grid-height);
}

#viewer:not(.continuous) .page.portrait-slide.ratio-four-thirds .page-grid {
  grid-template-rows: auto minmax(0, auto) minmax(
      var(--single-bottom-space),
      1fr
    );
}

#viewer:not(.continuous)
  .page.portrait-slide.ratio-four-thirds
  .page-grid__slide {
  height: auto;
  align-items: flex-start;
}

#viewer:not(.continuous)
  .page.portrait-slide.ratio-four-thirds
  .page-grid__slide
  img {
  height: auto;
  max-height: max(
    280px,
    calc(
      var(--single-grid-height) - var(--single-text-min) -
        var(--single-bottom-space) - var(--single-page-padding-block) -
        var(--single-page-padding-block) - 32px
    )
  );
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual:not(.ocr-open)
  .page-grid {
  height: 100%;
  align-content: stretch;
  grid-template-rows: minmax(0, 1fr) auto var(--single-bottom-space);
}

#viewer:not(.continuous) .page.portrait-slide.portrait-actual {
  padding-top: clamp(2px, 0.4vh, 6px);
  padding-bottom: calc(clamp(2px, 0.4vh, 6px) + 30px);
  --single-bottom-space: 0px;
  --single-text-min: 90px;
}

#viewer:not(.continuous) .page.portrait-slide.portrait-actual .page-grid {
  row-gap: clamp(8px, 1.2vh, 16px);
}

@media (min-width: 769px) {
  #viewer:not(.continuous) .page.portrait-slide.portrait-actual .page-grid__text {
    padding-bottom: 0;
  }
}

#viewer:not(.continuous) .page-grid__slide,
#viewer:not(.continuous) .page-grid__text,
#viewer:not(.continuous) .page-grid__spacer {
  width: 100%;
  display: flex;
  justify-content: center;
}

#viewer:not(.continuous) .page-grid__slide {
  align-items: flex-start;
  min-height: 0;
}

/* Footer page slide styling */
.footer-page .page-grid__slide {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center !important;
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual:not(.ocr-open)
  .page-grid__slide {
  height: 100%;
  align-items: center;
}

#viewer:not(.continuous) .page-grid__text {
  align-items: flex-start;
  min-height: auto;
}

@media (min-width: 769px) {
  #viewer:not(.continuous) .page-grid__text {
    padding-bottom: var(--footer-height);
  }
}

#viewer:not(.continuous) .page-grid__text .ocr-container {
  width: min(780px, 88%);
  margin: 0 auto;
  min-height: 0;
}

#viewer:not(.continuous) .page-grid__text .ocr-container.open {
  margin-bottom: 2px;
}

#viewer:not(.continuous) .page-grid__spacer {
  display: flex;
  align-items: stretch;
  pointer-events: none;
  min-height: var(--single-bottom-space);
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual:not(.ocr-open)
  .page-grid__spacer {
  height: var(--single-bottom-space);
}

#viewer:not(.continuous) .page-grid__slide img {
  width: auto;
  max-width: min(clamp(472px, 70.8vw, 100%), 100%);
  height: auto;
  max-height: calc(
    var(--single-grid-height)
    - var(--single-text-min)
    - var(--single-bottom-space)
    - var(--single-page-padding-inline) * 2
    - clamp(16px, 2vw, 32px)
  );
  min-height: 135px;
  object-fit: contain;
  object-position: center;
  box-shadow: none; /* box-shadowを無効化 */
  filter: drop-shadow(0px 18px 10px rgba(0, 0, 0, 0.12));
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual:not(.ocr-open)
  .page-grid__slide
  img {
  height: 100%;
  max-height: 100%;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

body.ua-mobile #viewer:not(.continuous) .page-grid__slide img {
  width: auto;
  max-width: 100%;
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual.ocr-open
  .page-grid {
  height: auto;
  align-content: start;
  grid-template-rows: auto auto var(--single-bottom-space);
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual.ocr-open
  .page-grid__slide {
  height: auto;
  align-items: flex-start;
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual.ocr-open
  .page-grid__spacer {
  height: var(--single-bottom-space);
}

#viewer:not(.continuous)
  .page.portrait-slide.portrait-actual.ocr-open
  .page-grid__slide
  img {
  height: auto;
  max-height: max(
    280px,
    calc(
      var(--single-grid-height) - var(--single-text-min) -
        var(--single-bottom-space)
    )
  );
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

body.ua-mobile #viewer:not(.continuous) .page.portrait-slide.portrait-actual {
  height: auto;
  min-height: auto;
}

body.ua-mobile
  #viewer:not(.continuous)
  .page.portrait-slide.portrait-actual
  .page-grid {
  grid-template-rows: auto auto var(--single-bottom-space);
}

body.ua-mobile
  #viewer:not(.continuous)
  .page.portrait-slide.portrait-actual
  .page-grid__slide {
  height: auto;
  min-height: auto;
  align-items: flex-start;
}

body.ua-mobile
  #viewer:not(.continuous)
  .page.portrait-slide.portrait-actual
  .page-grid__slide
  img {
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: none;
  object-fit: contain;
}

body.ua-mobile
  #viewer:not(.continuous)
  .page.portrait-slide.portrait-actual
  .page-grid__spacer {
  height: var(--single-bottom-space);
}

@media (max-width: 768px) {
  #viewer:not(.continuous) .page-grid__slide img {
    width: auto;
    max-width: 100%;
  }

  #viewer:not(.continuous) .page.portrait-slide.portrait-actual {
    height: auto;
    min-height: auto;
  }

  #viewer:not(.continuous) .page.portrait-slide.portrait-actual .page-grid {
    grid-template-rows: auto auto var(--single-bottom-space);
  }

  #viewer:not(.continuous)
    .page.portrait-slide.portrait-actual
    .page-grid__slide {
    height: auto;
    min-height: auto;
    align-items: flex-start;
  }

  #viewer:not(.continuous)
    .page.portrait-slide.portrait-actual
    .page-grid__slide
    img {
    width: auto;
    max-width: 100%;
    height: auto;
    max-height: none;
    object-fit: contain;
  }

  #viewer:not(.continuous)
    .page.portrait-slide.portrait-actual
    .page-grid__spacer {
    height: var(--single-bottom-space);
  }
}

.snap-viewer.continuous .page-grid {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 24px);
}

.snap-viewer.continuous .page-grid__slide,
.snap-viewer.continuous .page-grid__text {
  display: flex;
  justify-content: center;
  width: 100%;
}

.snap-viewer.continuous .page-grid__text {
  margin-bottom: 9px;
}

.snap-viewer.continuous .page-grid__spacer {
  display: none;
}

.snap-viewer.continuous .page-grid__text .ocr-container {
  width: 80%;
  margin: 0 auto;
}

/* ===== もくじメニューのリンクデザイン（表示メニューと統一） ===== */
.header-item[data-menu="toc"] .header-menu p {
  margin: 0;
  padding: 0 12px;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.header-item[data-menu="toc"] .header-menu p a {
  text-decoration: none;
  color: #333;
  display: block;
}

.header-item[data-menu="toc"] .header-menu p:hover {
  background: #f2f2f2;
  /* 背景が薄いグレーに */
}

.header-item[data-menu="toc"] .header-menu p:hover a {
  color: #000;
  /* テキストも濃く */
}

.header-item[data-menu="toc"] .header-menu p.index-sh {
  padding-left: 20px;
  font-size: 0.95em;
}

/* ===== スライド画像下に追従する半円（修正版） ===== */
/* ===== スライド画像下に追従する半円（修正版・クリック対応） ===== */
.slide-chevron-next,
.slide-chevron-prev {
  position: absolute;
  width: 80px !important;
  height: 80px !important;
  background: none;
  background-color: #c6c5c4;
  mask: url("assets/circle_chevron.svg") no-repeat center center / contain;
  -webkit-mask: url("assets/circle_chevron.svg") no-repeat center center /
    contain;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0;
  pointer-events: auto;
  cursor: pointer;
  z-index: 5;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.slide-chevron-next {
  transform: translate(-50%, -50%) rotate(-90deg);
}

.slide-chevron-prev {
  transform: translate(-50%, -50%) rotate(90deg);
}

#viewer:not(.continuous) .page:hover .slide-chevron-next,
#viewer:not(.continuous) .page:hover .slide-chevron-prev,
#viewer:not(.continuous) .nav-zone:hover ~ .slide-chevron-next,
#viewer:not(.continuous) .nav-zone:hover ~ .slide-chevron-prev {
  opacity: 1;
}

/* 不要な旧chevronを無効化 */
.page img::after,
.nav-zone::before {
  content: none !important;
  display: none !important;
}

.page img {
  position: relative;
  z-index: 2;
}

/* === サムネイルモーダル中はズームUIを無効化してグレーアウト（JSで aria-disabled を切替） === */
.footer-zoom[aria-disabled="true"],
.footer-zoom[aria-disabled="true"] * {
  pointer-events: none !important;
  opacity: 0.35 !important;
  filter: grayscale(60%);
}

/* === File section for virtual infinite scroll === */
.file-section {
  width: 100%;
  display: contents;
}

/* === ページ数プルダウンの視認性と前面化 === */
.page-select {
  display: none;
  background-color: #ffffff;
}

/* フォーカス中に size>0 でリストボックス化したときの見た目を補強 */
.page-select.open-sizing {
  position: relative;
  /* スタッキングコンテキストを作る */
  z-index: 2000;
  /* モーダル等より手前に出す */
  transform: translateY(110px);
  /* ドロップダウンの基点を少し下げてはみ出しを回避 */
  transform-origin: top left;
}

body[data-hide-share="true"] .header-item[data-menu="share"],
body[data-hide-share="true"] li:has([data-mobile-action="share"]),
body[data-hide-share="true"] #mobileShareModal {
  display: none !important;
}

body[data-hide-links="true"] .header-item[data-menu="links"],
body[data-hide-links="true"] #mobile-related-links {
  display: none !important;
}

.thumbnail-page-footer.footer {
  left: 0 !important;
}

/* ===== 目次ページ (Contents Page) ===== */
.contents-page-content {
  display: flex;
  flex-direction: column;
  width: min(100%, calc(100% - 40px));
  max-width: 1100px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 3px 7px 18px rgba(0, 0, 0, 0.22);
  padding: 52px 72px;
  box-sizing: border-box;
  margin-bottom: var(--footer-height);
  color: #333;
}

.contents-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0 34px 0;
  margin-bottom: 0;
}

.contents-header h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  color: #535353;
}

.contents-title {
  font-size: 24px;
  font-weight: 600;
  color: #535353;
}

.contents-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contents-list p {
  margin: 0;
  padding: 8px 8px 8px 0;
  border-radius: 4px;
}

.contents-list a {
  color: #1f1f1f;
  text-decoration: none;
  display: block;
  transition: text-decoration 0.15s ease;
}

.contents-list a:hover {
  text-decoration: underline;
}

.contents-pagecount {
  font-size: 14px;
  color: #555;
}

.contents-page-num {
  font-size: 13px;
  color: #707070;
  margin-left: 12px;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .contents-page-content {
    padding: 44px 38px;
  }
}

@media (max-width: 520px) {
  .contents-page {
    padding: 98px 0px;
  }

  .contents-page-content {
    padding: 36px 30px;
  }
}

.banner-text-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--banner-gap);
  margin-bottom: var(--banner-margin-vertical);
  margin-top: calc(var(--banner-margin-vertical) - var(--single-page-gap));
}

/* ===== Mobile Continuous Mode: Scroll Speed Control ===== */
body.ua-mobile .snap-viewer.continuous {
  scroll-snap-type: y proximity;
  scroll-padding-top: 20px;
  
  /* Smooth scrolling */
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  
  /* Touch controls */
  touch-action: pan-x pan-y;
  overscroll-behavior-y: contain;
}

body.ua-mobile .snap-viewer.continuous .page {
  /* Snap points at the start of each slide */
  scroll-snap-align: start;
  scroll-snap-stop: normal;
}

/* ===== モバイル表示でのOCRボックス高さ修正 ===== */
@media (max-width: 768px) {
	.ocr-container.open .ocr-right {
		max-height: 40vh;
		min-height: 100px;
	}
}

body.ua-mobile .ocr-container.open .ocr-right {
	max-height: 40vh;
	min-height: 100px;
}

/* ===== 全画面ボタン ===== */
.fullscreen-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px;
  background: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}

.fullscreen-btn:hover {
  background: #f6f6f6;
}

.fullscreen-btn img {
  width: 25px;
  height: 25px;
}

.fullscreen-btn span {
  font-size: 13px;
  color: #555;
}

.fullscreen-btn[data-tooltip]::after,
.fullscreen-btn[data-tooltip]::before {
  content: none;
}

@media (max-width: 1112px) {
  .fullscreen-btn {
    gap: 0;
    padding: 6px;
  }

  .fullscreen-btn > span {
    display: none;
  }

  .fullscreen-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translate(-50%, -6px);
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    z-index: 4050;
  }

  .fullscreen-btn[data-tooltip]::before {
    content: "";
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translate(-50%, -6px);
    border: 6px solid transparent;
    border-bottom-color: rgba(0, 0, 0, 0.75);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    z-index: 4049;
  }

  .fullscreen-btn[data-tooltip]:hover::after,
  .fullscreen-btn[data-tooltip]:hover::before {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* ===== フルスクリーン時の非表示要素 ===== */
:fullscreen .header-item[data-menu="toc"],
:fullscreen .display-option[data-mode="thumbnail"],
:fullscreen .header-item[data-menu="share"],
:fullscreen .header-item[data-menu="links"],
:fullscreen .sidebar,
:fullscreen .footer {
  display: none !important;
}

:-webkit-full-screen .header-item[data-menu="toc"],
:-webkit-full-screen .display-option[data-mode="thumbnail"],
:-webkit-full-screen .header-item[data-menu="share"],
:-webkit-full-screen .header-item[data-menu="links"],
:-webkit-full-screen .sidebar,
:-webkit-full-screen .footer {
  display: none !important;
}
/* =============================================================
   ZOOM SCREEN / CINEMA VIEWER OVERLAY
   ============================================================= */

.zoom-screen {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: #EFF3F7;
}
.zoom-screen[hidden] { display: none; }

.zoom-screen-viewer {
  position: absolute;
  inset: 0;
  outline: none;
  cursor: default;
  background: #EFF3F7;
}

/* 16:9 centered slide frame — same min() trick as mockup */
.zoom-screen-frame {
  --zs-ar-w: 16;
  --zs-ar-h: 9;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width:  min(100vw, calc(100vh * var(--zs-ar-w) / var(--zs-ar-h)));
  height: min(100vh, calc(100vw * var(--zs-ar-h) / var(--zs-ar-w)));
}

.zoom-screen-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none; /* clicks pass through to nav zones */
}

/* Left/right nav zones (full-height clickable areas) */
.zoom-nav-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  z-index: 10;
  cursor: pointer;
  background: transparent;
  border: none;
  outline: none;
  padding: 0;
}
.zoom-nav-zone.zoom-nav-prev { left: 0; }
.zoom-nav-zone.zoom-nav-next { right: 0; }
.zoom-nav-zone:disabled { cursor: default; }

/* Bottom control bar:
   width = slide width; top = slide bottom, clamped to viewport bottom */
.zoom-controls {
  --zs-bar-h: 52px;
  --zs-ar-w: 16;
  --zs-ar-h: 9;
  position: fixed;
  height: var(--zs-bar-h);
  width: min(100vw, calc(100vh * var(--zs-ar-w) / var(--zs-ar-h)));
  left: 50%;
  transform: translateX(-50%);
  top: min(
    calc(50vh + (50vw * var(--zs-ar-h) / var(--zs-ar-w))),
    calc(100vh - var(--zs-bar-h))
  );
  z-index: 20;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

/* Visibility is driven entirely by the JS idle-timer via .controls-visible:
   shown on pointer movement, hidden after 3s of inactivity. Pure CSS :hover /
   :focus-within are intentionally NOT used — in (in-frame) fullscreen the
   pointer always sits over the viewer, so :hover would pin the bar over the
   slide text and never let it fade. */
.zoom-controls.controls-visible {
  opacity: 1;
}

/* Subtle gradient halves background */
.zoom-bg-half {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.06)  0%,
    rgba(255, 255, 255, 0.03) 40%,
    rgba(255, 255, 255, 0)   100%
  );
  transition: background 0.22s ease;
  pointer-events: none;
}
.zoom-bg-left  { left: 0; }
.zoom-bg-right { right: 0; }

.zoom-controls.hover-left  .zoom-bg-left,
.zoom-controls.hover-right .zoom-bg-right {
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.24)  0%,
    rgba(255, 255, 255, 0.14) 25%,
    rgba(255, 255, 255, 0.05) 60%,
    rgba(255, 255, 255, 0)   100%
  );
}

/* Center prev/next arrow group */
.zoom-center-arrows {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 56px;
  z-index: 2;
  pointer-events: none;
}

/* Fullscreen button — right edge of controls bar */
.zoom-ctrl-fs {
  position: absolute;
  right: 50px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  opacity: 0.2;
}
.zoom-ctrl-fs:hover {
  opacity: 1;
}

/* Shared button style */
.zoom-ctrl-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.78);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
  padding: 0;
  pointer-events: auto;
}
.zoom-ctrl-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}
.zoom-ctrl-btn:active { transform: scale(0.94); }
.zoom-ctrl-fs:active  { transform: translateY(-50%) scale(0.94); }
.zoom-ctrl-btn:disabled {
  color: rgba(255, 255, 255, 0.28);
  cursor: not-allowed;
  pointer-events: none;
}
.zoom-ctrl-btn svg,
.zoom-ctrl-btn img {
  width: 22px;
  height: 22px;
  display: block;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.45));
}


/* Native fullscreen state */
.zoom-screen:fullscreen         { background: #EFF3F7; }
.zoom-screen:-webkit-full-screen { background: #EFF3F7; }