:root {
  --bg-color: #161616; --text-color: #eeeeee; --border-color: #555555;
  --grid-thin: #333333; --grid-medium: #666666; --grid-thick: #aaaaaa;
  --panel-bg: #101010; --hover-bg: #2a2a2a;
  
  --book-line: #4dd0e1; 
  --book-bg: #004d40; 
  
  --cell-icon-color: #fff59d; 
  --cell-icon-bg: rgba(255, 245, 157, 0.15);

  --highlight: #222222;
  --select-bg: rgba(66, 133, 244, 0.2); --select-border: #4285f4;
  --range-bg: rgba(66, 133, 244, 0.15);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #ffffff; --text-color: #111111; --border-color: #aaaaaa;
    --grid-thin: #dddddd; --grid-medium: #aaaaaa; --grid-thick: #555555;
    --panel-bg: #ffffff; --hover-bg: #f2f6ff;
    
    --book-line: #00bcd4; 
    --book-bg: #e0f7fa; 
    --cell-icon-color: #fbc02d; 
    --cell-icon-bg: rgba(253, 216, 53, 0.2);

    --highlight: #f0f0f0;
    --select-bg: rgba(26, 115, 232, 0.2); --select-border: #1a73e8;
    --range-bg: rgba(26, 115, 232, 0.1);
  }
}

:root[data-theme="dark"] {
  --bg-color: #161616; --text-color: #eeeeee; --border-color: #555555;
  --grid-thin: #333333; --grid-medium: #666666; --grid-thick: #aaaaaa;
  --panel-bg: #101010; --hover-bg: #2a2a2a;
  --book-line: #4dd0e1;
  --book-bg: #004d40;
  --cell-icon-color: #fff59d;
  --cell-icon-bg: rgba(255, 245, 157, 0.15);
  --highlight: #222222;
  --select-bg: rgba(66, 133, 244, 0.2); --select-border: #4285f4;
  --range-bg: rgba(66, 133, 244, 0.15);
}

:root[data-theme="light"] {
  --bg-color: #ffffff; --text-color: #111111; --border-color: #aaaaaa;
  --grid-thin: #dddddd; --grid-medium: #aaaaaa; --grid-thick: #555555;
  --panel-bg: #ffffff; --hover-bg: #f2f6ff;
  --book-line: #00bcd4;
  --book-bg: #e0f7fa;
  --cell-icon-color: #fbc02d;
  --cell-icon-bg: rgba(253, 216, 53, 0.2);
  --highlight: #f0f0f0;
  --select-bg: rgba(26, 115, 232, 0.2); --select-border: #1a73e8;
  --range-bg: rgba(26, 115, 232, 0.1);
}

body { background-color: var(--bg-color); color: var(--text-color); font-family: sans-serif; margin: 0; height: 100vh; display: flex; flex-direction: column; overflow: hidden; -webkit-user-select: none; user-select: none; }
input, textarea { -webkit-user-select: text; user-select: text; }
button, select { background: var(--bg-color); color: var(--text-color); border: 1px solid var(--border-color); padding: 6px 16px; cursor: pointer; border-radius: 4px; font-size: 12px; }
button:hover { background: var(--border-color); }

/* === モード切替タブ === */
#mode-tabs {
  flex: 0 0 auto;
  display: flex;
  align-items: stretch;
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  height: 32px;
  padding: 0;
}
.mode-tab {
  padding: 0 24px;
  display: flex;
  align-items: center;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  border-right: 1px solid var(--border-color);
  background: var(--highlight);
  color: var(--grid-medium);
  letter-spacing: 1px;
  transition: background 0.1s, color 0.1s;
}
.mode-tab:hover { background: var(--border-color); color: var(--text-color); }
.mode-tab.active {
  background: var(--bg-color);
  color: var(--select-border);
  border-bottom: 2px solid var(--select-border);
  margin-bottom: -1px;
}
.mode-tabs-spacer { flex: 1; }

.document-tabs {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-end;
  min-height: 30px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
}
.document-tab {
  height: 28px;
  max-width: 220px;
  min-width: 96px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px 0 10px;
  border-right: 1px solid var(--border-color);
  border-top: 1px solid transparent;
  background: var(--highlight);
  color: var(--grid-medium);
  font-size: 11px;
  cursor: pointer;
  user-select: none;
}
.document-tab.active {
  background: var(--bg-color);
  color: var(--text-color);
  border-top-color: var(--select-border);
}
.document-tab.dragging {
  opacity: 0.55;
}
.document-tab.dirty .document-tab-title::after {
  content: " *";
  color: #ff6b6b;
  font-weight: bold;
}
.document-tab-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}
.document-tab-close {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  opacity: 0.8;
  font-size: 14px;
  line-height: 18px;
  cursor: pointer;
  position: relative;
  z-index: 10;
}
.document-tab-close:hover {
  background: var(--hover-bg);
  opacity: 1;
}

/* === ページ送り === */
.page-nav {
  display: none;  /* デフォルト非表示、Previewで表示 */
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  border-left: 1px solid var(--border-color);
}
.page-nav.visible {
  display: flex;
}
.page-nav button {
  padding: 2px 8px;
  font-size: 10px;
  min-width: 24px;
}
.page-nav button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
#page-indicator {
  font-size: 11px;
  min-width: 50px;
  text-align: center;
}
.preview-cut-select {
  max-width: 96px;
  height: 22px;
  padding: 1px 5px;
  color: var(--text-color);
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
  color-scheme: dark;
}
:root[data-theme="light"] .preview-cut-select {
  color-scheme: light;
}
.preview-cut-select:focus {
  outline: 1px solid var(--select-border);
  outline-offset: 1px;
}
.preview-cut-select option {
  color: var(--text-color);
  background-color: var(--panel-bg);
}
:root[data-theme="dark"] .preview-cut-select,
:root[data-theme="dark"] .preview-cut-select option {
  color: #eeeeee;
  background-color: #101010;
}
.mode-status {
  padding: 0 16px;
  display: flex;
  align-items: center;
  font-size: 11px;
  color: var(--grid-medium);
}
.mode-status.dirty { color: #e57373; }

.current-file-label {
  max-width: 280px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 11px;
  color: var(--text-color);
  border-left: 1px solid var(--border-color);
}

/* === プレビューサイドバー === */
.preview-sidebar {
  position: fixed;
  top: 96px;  /* モードタブ + ドキュメントタブ + メニューバー分 */
  width: 180px;
  height: calc(100vh - 96px);
  background: var(--bg-color);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 8px;
  box-sizing: border-box;
  z-index: 100;
  overflow-y: auto;
}
.preview-sidebar.left {
  left: 0;
  border-left: none;
  border-right: 1px solid var(--border-color);
}
.preview-sidebar.right {
  right: 0;
}

.sidebar-section {
  margin-bottom: 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}
.sidebar-section.no-border {
  border: none;
}
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  background: var(--highlight);
  cursor: pointer;
  user-select: none;
}
.sidebar-header:hover {
  background: var(--border-color);
}
.sidebar-label {
  font-size: 10px;
  color: var(--text-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.sidebar-toggle {
  font-size: 10px;
  color: var(--grid-medium);
}
.sidebar-content {
  padding: 6px 8px;
}
.sidebar-content.collapsed {
  display: none;
}
.sidebar-row {
  display: flex;
  gap: 4px;
}
.sidebar-select {
  flex: 1;
  padding: 4px 6px;
  font-size: 11px;
  background: var(--highlight);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 3px;
}
.sidebar-select.small {
  flex: 1;
}
.sidebar-btn {
  padding: 6px 10px;
  font-size: 11px;
  background: var(--highlight);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  cursor: pointer;
}
.sidebar-btn:hover {
  background: var(--border-color);
}
.sidebar-btn.full-width {
  width: 100%;
}
.sidebar-btn.small {
  padding: 4px 8px;
  flex: 1;
}
.sidebar-btn.disabled, .sidebar-tool.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.sidebar-tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3px;
}
.sidebar-tool {
  padding: 5px 4px;
  font-size: 10px;
  background: var(--highlight);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}
.sidebar-tool:hover:not(.disabled) {
  background: var(--border-color);
}
.sidebar-tool.active {
  background: var(--select-bg);
  border-color: var(--select-border);
}

.zoom-row {
  align-items: center;
}
.zoom-display {
  min-width: 45px;
  text-align: center;
  font-size: 11px;
}

.sidebar-spacer {
  flex: 1;
}

.collapse-btn {
  margin-top: auto;
}

.sidebar-expand-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 60px;
  background: var(--highlight);
  border: 1px solid var(--border-color);
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  z-index: 101;
}
.sidebar-expand-btn.left {
  left: 0;
  border-radius: 0 4px 4px 0;
}
.sidebar-expand-btn.right {
  right: 0;
  border-radius: 4px 0 0 4px;
}

/* サイドバー順序設定 */
.sidebar-order-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-order-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--highlight);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: grab;
  font-size: 12px;
}
.sidebar-order-item:active {
  cursor: grabbing;
}
.sidebar-order-item.dragging {
  opacity: 0.5;
}
.drag-handle {
  color: var(--grid-medium);
}

/* === プレビューコンテナ === */
#preview-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: auto;
  background: #666;
  padding: 20px;
  position: relative;
}
#preview-stage {
  position: relative;
  flex: 0 0 auto;
  transform-origin: 0 0;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  touch-action: none;
}
#preview-image {
  max-width: 100%;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  display: block;
  pointer-events: none;
}
#handwriting-canvas,
#handwriting-ui-canvas {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
#handwriting-canvas {
  z-index: 1;
  touch-action: none;
}
#handwriting-ui-canvas {
  z-index: 2;
  touch-action: none;
}
.handwriting-action-popover {
  position: absolute;
  z-index: 3;
  display: none;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: rgba(28, 28, 28, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
  transform: translateX(-50%);
  pointer-events: auto;
}
.handwriting-action-popover button {
  padding: 4px 8px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 4px;
  background: #222;
  color: #fff;
  font-size: 11px;
  white-space: nowrap;
}
.handwriting-action-popover button:hover {
  background: #333;
}

/* === メニューバー === */
#menubar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  background: var(--highlight);
  border-bottom: 1px solid var(--border-color);
  height: 30px;
  padding: 0 8px;
  z-index: 500;
  position: relative;
}
#menubar .menu-item {
  padding: 0 12px;
  height: 100%;
  display: flex;
  align-items: center;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  color: var(--text-color);
  border-radius: 2px;
  transition: background 0.1s;
}
#menubar .menu-item:hover, #menubar .menu-item.open { background: var(--select-bg); color: #fff; }
#menubar .menu-item.mode-only.hidden { display: none; }

.menubar-spacer { flex: 1; }
.menubar-inline {
  font-size: 11px;
  color: var(--text-color);
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 8px;
}
.menubar-inline input[type="number"] {
  width: 40px;
  padding: 2px 4px;
  font-size: 11px;
  background: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 3px;
}
.menubar-tool-sizes {
  gap: 6px;
}
.tool-size-label {
  font-size: 10px;
  color: var(--grid-medium);
  white-space: nowrap;
}
.tool-size-group {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}
.tool-size-btn {
  min-width: 24px;
  height: 20px;
  padding: 0 6px;
  border: 0;
  border-right: 1px solid var(--border-color);
  border-radius: 0;
  background: var(--bg-color);
  color: var(--text-color);
  font-size: 11px;
  line-height: 20px;
}
.tool-size-btn:last-child {
  border-right: 0;
}
.tool-size-btn:hover:not(:disabled) {
  background: var(--highlight);
}
.tool-size-btn.active {
  background: var(--select-bg);
  color: #fff;
  font-weight: bold;
}
.menubar-tool-sizes.is-disabled {
  opacity: 0.45;
}
.menubar-tool-sizes.is-disabled .tool-size-btn {
  cursor: default;
}
.tool-size-btn:disabled {
  color: var(--grid-medium);
}
.qp-swatch {
  width: 16px; height: 16px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  padding: 0;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s;
}
.qp-swatch:hover { transform: scale(1.15); }
.qp-swatch.active {
  border-color: var(--text-color);
  box-shadow: 0 0 0 2px var(--select-border);
}

/* === ドロップダウンメニュー === */
.menu-dropdown {
  display: none;
  position: absolute;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 4px 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  min-width: 220px;
  z-index: 1000;
  font-size: 12px;
  user-select: none;
}
.menu-dropdown.open { display: block; }
.menu-row {
  padding: 6px 14px 6px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-color);
  position: relative;
  white-space: nowrap;
}
.menu-row:hover { background: var(--select-bg); color: #fff; }
.menu-row.menu-disabled { color: var(--grid-medium); cursor: default; opacity: 0.55; }
.menu-row.menu-disabled:hover { background: transparent; color: var(--grid-medium); }
.menu-label {
  padding: 5px 12px 3px;
  color: var(--grid-medium);
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 0.4px;
  cursor: default;
}
.menu-key {
  margin-left: 24px;
  font-size: 10px;
  color: var(--grid-medium);
  font-family: monospace;
}
.menu-row:hover .menu-key { color: #ddd; }
.menu-sep {
  height: 1px;
  background: var(--border-color);
  margin: 4px 0;
  opacity: 0.5;
}
.menu-submenu .submenu-arrow {
  margin-left: 12px;
  font-size: 9px;
  color: var(--grid-medium);
}
.menu-submenu:hover > .menu-sub { display: block; }
.menu-sub {
  position: absolute;
  left: 100%;
  top: -5px;
  margin-left: 0;
}

/* === 設定モーダル汎用 === */
.settings-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
}
.settings-modal-inner {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
  padding: 20px 24px;
  min-width: 360px;
  max-width: 600px;
  color: var(--text-color);
}
.settings-modal-inner h3 {
  margin: 0 0 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}
.camera-kind-meta {
  min-height: 16px;
  margin-top: 4px;
  font-size: 10px;
  color: var(--grid-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.camera-recent-kinds {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.camera-recent-kind {
  max-width: 100%;
  padding: 2px 7px;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  background: var(--highlight);
  color: var(--text-color);
  font-size: 10px;
  line-height: 1.4;
  cursor: pointer;
}
.camera-recent-kind:hover {
  border-color: var(--select-bg);
}
.settings-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 12px;
  flex-wrap: wrap;
}
.settings-row label {
  min-width: 140px;
}
.settings-row input[type="number"], .settings-row input[type="text"] {
  width: 60px;
  padding: 4px 6px;
  background: var(--highlight);
  color: var(--text-color);
  border: 1px solid var(--grid-thick);
  border-radius: 3px;
  font-size: 12px;
}
.settings-hint {
  font-size: 11px;
  color: var(--grid-medium);
  flex-basis: 100%;
  margin-left: 148px;
}
.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}
.settings-actions button {
  padding: 6px 16px;
}
.settings-actions button.primary {
  background: var(--select-bg);
  color: #fff;
  border-color: var(--select-border);
}

.settings-hub-inner {
  width: min(720px, calc(100vw - 48px));
  max-width: 720px;
}
.settings-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.settings-hub-card {
  min-height: 74px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 5px;
  text-align: left;
  background: var(--highlight);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}
.settings-hub-card:hover:not(:disabled) {
  border-color: var(--select-border);
  background: var(--hover-bg);
}
.settings-hub-card strong {
  font-size: 13px;
}
.settings-hub-card span {
  color: var(--grid-medium);
  font-size: 11px;
  line-height: 1.4;
}
.settings-hub-card.disabled {
  opacity: 0.55;
  cursor: default;
}
.settings-hub-backup {
  margin-top: 14px;
  padding-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border-color);
}

/* 画像書き出し */
.image-export-modal-inner {
  width: min(920px, calc(100vw - 48px));
  max-width: 920px;
  max-height: calc(100vh - 60px);
  overflow: auto;
}
.image-export-destination {
  flex: 1;
  min-width: 240px;
  color: var(--grid-medium);
  font-size: 12px;
}
.image-export-check-label {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  cursor: pointer;
}
.image-export-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 12px;
}
.image-export-page-count {
  flex: 1;
  color: var(--grid-medium);
  font-size: 11px;
}
.image-export-pages {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
  width: 100%;
  max-height: 360px;
  overflow: auto;
  padding: 8px;
  box-sizing: border-box;
  border: 1px solid var(--border-color);
  background: rgba(255,255,255,0.03);
}
.image-export-page {
  border: 1px solid var(--border-color);
  background: var(--highlight);
  color: var(--text-color);
  border-radius: 6px;
  padding: 6px;
  cursor: pointer;
  text-align: left;
}
.image-export-page.selected {
  border-color: var(--select-border);
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.35);
}
.image-export-page img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1.414;
  object-fit: contain;
  background: #d8edf8;
  border: 1px solid rgba(0,0,0,0.25);
  box-sizing: border-box;
  margin-bottom: 6px;
}
.image-export-page-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
}
.image-export-filename-preview {
  width: 100%;
  max-height: 96px;
  overflow: auto;
  box-sizing: border-box;
  border: 1px solid var(--border-color);
  background: rgba(0,0,0,0.18);
  padding: 8px;
  color: var(--grid-medium);
  font-family: monospace;
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-wrap;
}
.image-export-progress-row {
  margin-top: 12px;
  padding: 10px;
  border: 1px solid var(--border-color);
  background: rgba(0,0,0,0.18);
  border-radius: 4px;
}
.image-export-progress-label {
  color: var(--text-color);
  font-size: 12px;
  margin-bottom: 8px;
}
.image-export-progress-row progress {
  width: 100%;
  height: 12px;
}

/* I/O モーダル特有 */
.io-checks, .io-radios {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 8px;
  font-size: 12px;
}
.io-checks label, .io-radios label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.io-warn {
  background: rgba(255, 152, 0, 0.15);
  border: 1px solid rgba(255, 152, 0, 0.5);
  color: #ffb74d;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 11px;
  margin-bottom: 12px;
  white-space: pre-wrap;
  line-height: 1.5;
}
.io-note, .io-hint {
  background: rgba(80, 150, 220, 0.12);
  border: 1px solid rgba(80, 150, 220, 0.35);
  color: var(--text-color);
  padding: 8px 10px;
  border-radius: 4px;
  font-size: 11px;
  margin-bottom: 10px;
  white-space: pre-wrap;
  line-height: 1.5;
}
.io-hint {
  margin: 0 0 6px 0;
  opacity: 0.85;
}

#main-wrapper { flex: 1; display: flex; width: 100%; overflow: hidden; position: relative; }

#editor-container { flex: 1; display: flex; flex-direction: column; align-items: center; overflow: hidden; position: relative; width: 100%; }
#header-static { flex: 0 0 auto; width: 100%; display: flex; justify-content: center; z-index: 60; background: var(--bg-color); border-bottom: 1px solid var(--border-color); }
#meta-wrapper { position: relative; width: 100%; max-width: 100%; cursor: text; }

#scroll-viewport { flex: 1; width: 100%; overflow-y: scroll; overflow-x: auto; position: relative; background: var(--bg-color); }
#canvas-wrapper { position: relative; margin: 0; }

.shared-cut-switcher {
  position: fixed;
  z-index: 10050;
  min-width: 132px;
  padding: 6px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
}

.shared-cut-switcher-title {
  padding: 2px 6px 6px;
  color: var(--grid-medium);
  font-size: 11px;
  font-weight: 700;
}

.shared-cut-switcher button {
  display: block;
  width: 100%;
  margin: 2px 0;
  padding: 5px 8px;
  color: var(--text-color);
  background: transparent;
  border: 1px solid transparent;
  text-align: left;
  font-weight: 700;
  cursor: pointer;
}

.shared-cut-switcher button:hover,
.shared-cut-switcher button.active {
  border-color: var(--select-border);
  background: var(--hover-bg);
}

.shared-cut-switcher button.add {
  margin-top: 6px;
  border-top-color: var(--border-color);
  color: var(--select-border);
}
#columnHeaderCanvas { position: sticky; top: 0; z-index: 50; background: var(--bg-color); display: block; }
#gridCanvas { display: block; z-index: 10; }

#floating-panel {
  position: absolute; right: 25px; top: 25px; width: 220px;
  background: var(--bg-color); border: 1px solid var(--border-color);
  border-radius: 6px; box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  display: flex; flex-direction: column; z-index: 200;
  transition: background-color 0.2s; overflow: hidden;
}
@media (prefers-color-scheme: light) { #floating-panel { box-shadow: 0 4px 12px rgba(0,0,0,0.15); } }

.panel-header {
  padding: 10px 12px; background: var(--highlight); border-bottom: 1px solid var(--border-color);
  font-weight: bold; font-size: 13px; display: flex; justify-content: space-between; align-items: center;
  cursor: grab; user-select: none; letter-spacing: 1px;
}
.panel-header:active { cursor: grabbing; }
.panel-header:hover { background: var(--border-color); }

.panel-content { flex: 1; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 4px; max-height: 400px; }

.panel-footer {
  padding: 8px; background: var(--highlight); border-top: 1px solid var(--border-color);
  display: flex; gap: 5px; justify-content: space-around;
}
.panel-footer button { flex: 1; padding: 6px 0; font-size: 11px; font-weight: bold; }

#floating-panel.collapsed .panel-content { display: none; }
#floating-panel.collapsed .panel-footer { display: none; }
#floating-panel.collapsed .panel-header { border-bottom: none; }

.config-item { display: flex; align-items: center; padding: 6px 10px; background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 4px; font-size: 12px; font-weight: bold; cursor: grab; user-select: none; }
.config-item:active { cursor: grabbing; }
.config-item:hover { background: #333; }
@media (prefers-color-scheme: light) { .config-item:hover { background: #f5f5f5; } }

.book-item { border-left: 4px solid var(--book-line); }
.cell-item { border-left: 4px solid var(--cell-icon-color); margin-left: 15px; }

.item-icon { font-size: 9px; padding: 2px 4px; border-radius: 3px; margin-right: 8px; display: inline-block; }
.icon-book { background: var(--book-bg); color: var(--book-line); border: 1px solid var(--book-line); }
.icon-cell { background: var(--cell-icon-bg); color: var(--cell-icon-color); border: 1px solid var(--cell-icon-color); }

.item-name { flex: 1; margin: 0 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: pointer; }
.delete-btn { cursor: pointer; opacity: 0.4; font-size: 14px; padding: 0 4px; transition: 0.1s; }
.delete-btn:hover { opacity: 1; color: #ff5555; }

#cellInput, #bookInput {
  position: absolute; display: none; box-sizing: border-box; text-align: center;
  font-weight: bold; color: var(--text-color); outline: none; padding: 0; margin: 0; 
}
#cellInput { background: var(--select-bg); border: 2px solid var(--select-border); z-index: 30; }
#bookInput { background: var(--book-bg); border: 2px solid var(--book-line); border-radius: 4px; font-size: 10px; z-index: 80; }

#metaInput, #metaTextArea {
  position: absolute; display: none; box-sizing: border-box;
  font-weight: bold; color: var(--text-color);
  background: var(--bg-color); border: 2px solid var(--select-border);
  outline: none; padding: 4px 8px; margin: 0; z-index: 70;
}
#metaInput { font-size: 14px; }
#metaTextArea { font-size: 13px; padding: 8px; resize: none; line-height: 1.4; }

.menu-item { padding: 6px 12px; font-size: 12px; font-weight: bold; cursor: pointer; color: var(--text-color); border-radius: 2px; transition: 0.1s; }
.menu-item:hover { background: var(--select-bg); color: #fff; }

/* === Undo/Redoボタン（タブレット用） === */
.undo-redo-float {
  position: fixed;
  bottom: 20px;
  left: 20px;
  display: flex;
  gap: 8px;
  z-index: 1000;
}
.undo-redo-float button {
  width: 48px;
  height: 48px;
  font-size: 24px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: var(--panel-bg);
  color: var(--text-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
  cursor: pointer;
  touch-action: manipulation;
}
.undo-redo-float button:active {
  background: var(--select-bg);
}
.undo-redo-float .drag-handle {
  width: 32px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--grid-medium);
  cursor: move;
  touch-action: none;
}
.tablet-draggable {
  touch-action: none;
}
body:not(.tablet-mode) .undo-redo-float { display: none !important; }

/* === 数字パッド（タブレット用） === */
.numpad-panel {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  z-index: 1000;
  touch-action: none;
}
.numpad-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--highlight);
  border-bottom: 1px solid var(--border-color);
  border-radius: 8px 8px 0 0;
  cursor: move;
  font-size: 12px;
  font-weight: bold;
  touch-action: none;
}
.numpad-header button {
  padding: 4px 10px;
  font-size: 16px;
  border: none;
  background: transparent;
  color: var(--text-color);
  cursor: pointer;
}
.numpad-header button:active {
  background: var(--hover-bg);
  border-radius: 4px;
}
.numpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 52px);
  gap: 6px;
  padding: 8px;
}
.numpad-grid button {
  height: 48px;
  font-size: 20px;
  font-weight: bold;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-color);
  color: var(--text-color);
  cursor: pointer;
  touch-action: manipulation;
}
.numpad-grid button:active {
  background: var(--select-bg);
}
.numpad-grid button.symbol {
  background: var(--highlight);
  font-size: 14px;
  height: 40px;
}
.numpad-grid button.wide {
  grid-column: span 2;
}
.numpad-grid .enter-btn {
  grid-column: span 3;
  background: var(--select-bg);
  font-size: 16px;
}
/* タブレットモードのみ表示 */
body:not(.tablet-mode) .numpad-panel { display: none !important; }