:root {
  --bg: #f9f9f9;
  --workspace: #f9f9f9;
  --surface: #ffffff;
  --panel: #ffffff;
  --panel-bg: #eeeeee;
  --border: #dddddd;
  --text: #2a2a2a;
  --text-dim: #888888;
  --accent: #4a9eff;
  --accent-hover: #5ab0ff;
  --danger: #f44747;
  --header-h: 40px;
  --panel-w: 240px;
  --panel-left-w: 300px;
  --panel-right-w: 240px;
  --radius: 4px;
  --block-hover: #e8f4ff;
  --block-selected: #e8f0fe;
  --block-focus: #fffff5;
  --canvas-bg: #3a3a3a;
}

[data-theme="dark"] {
  --bg: #1e1e1e;
  --workspace: #1a1a1a;
  --surface: #2a2a2a;
  --panel: #252525;
  --panel-bg: #1a1a1a;
  --border: #3a3a3a;
  --text: #cccccc;
  --text-dim: #888888;
  --accent: #4a9eff;
  --accent-hover: #5ab0ff;
  --danger: #f44747;
  --block-hover: #2a3a4a;
  --block-selected: #1e3a5f;
  --block-focus: #2a2a1e;
  --canvas-bg: #111111;
}
[data-theme="dark"] .canvas-page {
  background: #fff;
  color: #1a1a1a;
  border-color: #444;
  box-shadow: 0 2px 8px #0005, 0 8px 32px #0004;
}
[data-theme="dark"] .block:hover { border-color: #4a9eff; }
[data-theme="dark"] .nd-btn:hover { background: #444; border-color: #666; }
[data-theme="dark"] .welcome-hint-text { color: #666; }
[data-theme="dark"] .structural-label { color: #888; border-color: #555; }
[data-theme="dark"] .block-page-break .structural-label { border-color: #666; color: #888; }
[data-theme="dark"] .canvas-scroll-top { background: #333; color: #888; }
[data-theme="dark"] .canvas-scroll-top:hover { background: #444; color: var(--text); }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; overflow: hidden; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
}

/* ─── App Grid ──────────────────────────────────────────────────── */
#app {
  display: grid;
  width: 100%; height: 100%;
  grid-template:
    "header  header   header"  var(--header-h)
    "left    workspace right"  1fr
    / var(--panel-left-w) 1fr var(--panel-right-w);
}

/* ─── Header / Menu Bar ─────────────────────────────────────────── */
#header {
  grid-area: header;
  display: flex;
  align-items: center;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0 8px;
  user-select: none;
  -webkit-app-region: drag;
  gap: 10px;
}

.menu-btn {
  position: relative;
  padding: 4px 10px;
  cursor: pointer;
  border-radius: var(--radius);
  -webkit-app-region: no-drag;
}
.menu-btn:hover, .menu-btn.open { background: var(--workspace); }

/* ─── Theme Toggle ─────────────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-dim);
  margin-right: 8px;
  -webkit-app-region: no-drag;
}
.theme-toggle:hover { background: var(--workspace); color: var(--text); }
.theme-icon-light { display: none; }
.theme-icon-dark { display: block; }
[data-theme="dark"] .theme-icon-light { display: block; }
[data-theme="dark"] .theme-icon-dark { display: none; }

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px #0004;
  padding: 4px 0;
  z-index: 1000;
}
.dropdown.open { display: block; }

.dropdown-item {
  padding: 6px 24px 6px 12px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.dropdown-item:hover { background: var(--accent); color: #fff; }
.dropdown-item.disabled { opacity: 0.4; pointer-events: none; }

.dropdown-sep { height: 1px; background: var(--border); margin: 4px 0; }

.dropdown-item.has-submenu { position: relative; }
.dropdown-item.has-submenu::after { content: '\25B8'; margin-left: auto; font-size: 10px; opacity: 0.6; }
.dropdown-submenu {
  display: none;
  position: absolute;
  left: 100%;
  top: -4px;
  min-width: 170px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px #0004;
  padding: 4px 0;
  z-index: 1001;
  color: var(--text);
}
.dropdown-item.has-submenu:hover > .dropdown-submenu { display: block; }

.shortcut { font-size: 11px; opacity: 0.6; margin-left: 16px; }

/* ─── Panels ────────────────────────────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow: hidden;
}
#panel-left { grid-area: left; position: relative; }
#panel-left .panel-resize-handle {
  position: absolute;
  top: 0;
  right: -3px;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 10;
}
#panel-left .panel-resize-handle::after {
  content: '';
  position: absolute;
  top: 0;
  left: 2px;
  width: 2px;
  height: 100%;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.15s;
}
#panel-left .panel-resize-handle:hover::after,
#panel-left.is-resizing .panel-resize-handle::after { opacity: 1; }
body.panel-resizing { cursor: col-resize !important; user-select: none !important; }
body.panel-resizing * { cursor: col-resize !important; user-select: none !important; }
#panel-right { grid-area: right; border-right: none; border: 1px solid var(--panel-bg); container-type: inline-size; position: relative;}
#panel-right .panel-resize-handle {
  position: absolute;
  top: 0;
  left: -3px;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 10;
}
#panel-right .panel-resize-handle::after {
  content: '';
  position: absolute;
  top: 0;
  right: 2px;
  width: 2px;
  height: 100%;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.15s;
}
#panel-right .panel-resize-handle:hover::after,
#panel-right.is-resizing .panel-resize-handle::after { opacity: 1; }
.panel.hidden { display: none; }

.panel-header {
  padding: 8px 12px;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-tabs {
  display: flex;
  flex-shrink: 0;
  background: var(--panel-bg);
}
.panel-tab {
  flex: 1;
  justify-items: center;
  align-items: center;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 8px;
  font-size: 12px;
  font-weight: 500;
  text-transform: Titlecase;
  letter-spacing: 0.6px;
  color: var(--text);
  background: none;
  border: none;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  text-align: left;
  padding-left: 10px;
  padding-top: 8px;
}
.panel-tab:hover { color: var(--text); }
.panel-tab.active { background: var(--panel); 
  border-bottom: 1px solid var(--panel); border-top: 1px solid var(--border);}

.panel-tab-content { display: none; flex: 1; overflow-y: auto; padding: 8px; min-height: 0; }
.panel-tab-content.active { display: block; }

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  background: var(--panel);
}
#panel-right .panel-body { padding: 6px 8px; }

.panel-empty { color: var(--text-dim); font-style: italic; text-align: center; padding: 16px; }

/* Pages panel */
.chapter-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: var(--radius);
  cursor: grab;
  margin-bottom: 2px;
  user-select: none;
}
.chapter-item:hover { background: var(--border); }
.page-icon { font-size: 14px; flex-shrink: 0; width: 18px; text-align: center; }
.page-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; }

.page-type-select {
  flex-shrink: 0;
  margin-left: auto;
  width: 20px;
  height: 20px;
  background: transparent;
  border: none;
  border-radius: 3px;
  color: transparent;
  font-size: 0;
  padding: 0;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23888' stroke-width='1.3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0;
  transition: opacity 0.15s;
}
.chapter-item:hover .page-type-select,
.chapter-item.selected .page-type-select,
.chapter-item.active .page-type-select { opacity: 1; }
.page-type-select:hover { background-color: rgba(255,255,255,0.08); }
.chapter-item.active .page-type-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23fff' stroke-width='1.3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.chapter-item.selected { background: rgba(74, 158, 255, 0.15); }
.chapter-item.active { background: var(--accent); color: #fff; }

.chapter-item.page-entering {
  animation: page-slide-in 200ms ease-out;
}
.chapter-item.page-removing {
  animation: page-slide-out 150ms ease-in forwards;
}
@keyframes page-slide-in {
  from { opacity: 0; transform: translateY(-8px); max-height: 0; }
  to { opacity: 1; transform: translateY(0); max-height: 40px; }
}
@keyframes page-slide-out {
  from { opacity: 1; transform: translateX(0); max-height: 40px; }
  to { opacity: 0; transform: translateX(-20px); max-height: 0; }
}

/* Drag and drop */
.pages-dragging { cursor: grabbing; }
.pages-dragging .chapter-item { transition: transform 150ms ease, opacity 150ms ease; cursor: grabbing; }
.pages-dragging .page-drag-source { opacity: 0.35; transform: scale(0.96); }
.page-drop-indicator {
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  margin: 2px 10px;
  position: relative;
  pointer-events: none;
  box-shadow: 0 0 4px var(--accent);
}
.page-drag-ghost {
  position: fixed;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px #0006;
  font-size: 13px;
  color: var(--text);
  pointer-events: none;
  z-index: 3000;
  white-space: nowrap;
}
.page-drag-ghost .page-icon { font-size: 14px; }

/* Panel toolbar (bottom) */
.panel-toolbar {
  display: none;
  align-items: center;
  gap: 2px;
  padding: 4px 8px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.panel-toolbar.active {
  display: flex;
  justify-content: flex-end;
}
.panel-toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-dim);
  border-radius: var(--radius);
  cursor: pointer;
}
.panel-toolbar-btn:hover { background: var(--border); color: var(--text); }
.panel-toolbar-btn--danger:hover { color: var(--danger); }
.panel-toolbar-btn:disabled { opacity: 0.3; pointer-events: none; }
.panel-toolbar-sep { width: 1px; height: 16px; background: var(--panel); margin: 0 2px; }

/* Page type picker popup */
.page-type-picker {
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px #0006;
  padding: 4px 0;
  z-index: 2000;
  max-height: 320px;
  overflow-y: auto;
  min-width: 180px;
}
.page-type-picker-group {
  padding: 4px 12px 2px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}
.page-type-picker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  cursor: pointer;
  font-size: 12px;
}
.page-type-picker-item:hover { background: var(--accent); color: #fff; }
.page-type-picker-item .ptp-icon { width: 18px; text-align: center; flex-shrink: 0; }

/* ToC panel */
.toc-toolbar {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.toc-refresh-btn {
  font-size: 11px;
  padding: 3px 10px;
  width: 100%;
}
.toc-item {
  padding: 4px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  margin-bottom: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toc-item:hover { background: var(--border); }
.toc-item.active { background: var(--accent); color: #fff; }
.toc-item[data-level="1"] { font-weight: 600; }
.toc-item[data-level="2"] { padding-left: 20px; }
.toc-item[data-level="3"] { padding-left: 32px; font-size: 12px; color: var(--text-dim); }
.toc-item[data-level="3"]:hover { color: var(--text); }

/* Inspector — Figma-style compact grid */
.ip-style-picker {
  padding: 6px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.ip-select--style {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 6px 8px;
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
}
.ip-select--style:focus { outline: none; border-color: var(--accent); }

.ip-format-row {
  display: flex;
  gap: 4px;
  padding: 2px 0;
}
.ip-format-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
}
.ip-format-btn:hover { background: var(--border); }
.ip-format-btn:active { background: var(--accent); }

.ip-section { margin-bottom: 2px; }
.ip-section-header {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  padding: 8px 0 4px;
  cursor: pointer;
  user-select: none;
  padding-bottom: 5px;
}
.ip-section-header:hover { color: var(--text); }
.ip-section.collapsed .ip-section-body { display: none; }

.ip-section-body { padding: 0 0 4px; }

.ip-row {
  display: grid;
  gap: 6px;
  margin-bottom: 6px;
}
.ip-row--half { grid-template-columns: 1fr 1fr; }
.ip-row--full { grid-template-columns: 1fr; }

.ip-cell { min-width: 0; padding-bottom: 5px;}

.ip-label {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ip-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 4px 6px;
  font-size: 11px;
  font-family: inherit;
  min-width: 0;
}
.ip-input:focus { outline: none; border-color: var(--accent); }
select.ip-input { padding: 4px 4px; }

.ip-color {
  display: flex;
  gap: 4px;
  align-items: center;
}
.ip-color-swatch {
  width: 22px;
  height: 22px;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
  background: none;
}
.ip-color-swatch::-webkit-color-swatch-wrapper { padding: 1px; }
.ip-color-swatch::-webkit-color-swatch { border: none; border-radius: 2px; }
.ip-color-text { flex: 1; min-width: 0; }

.ip-inherit-note {
  font-size: 11px;
  color: var(--text-dim);
  font-style: italic;
  padding: 4px 0 8px;
  margin: 0;
}
.ip-structural-type {
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  padding: 8px 0;
}
.ip-structural-remove {
  width: 100%;
  padding: 6px 0;
  margin-top: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--danger);
  font-size: 12px;
  cursor: pointer;
}
.ip-structural-remove:hover { background: var(--border); }

@container (max-width: 180px) {
  .ip-row--half { grid-template-columns: 1fr; }
}

/* ─── Workspace / Canvas ────────────────────────────────────────── */
#workspace-container {
  grid-area: workspace;
  position: relative;
  overflow: hidden;
  background: var(--workspace);
}

.canvas-scroll-top {
  position: absolute;
  bottom: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, color 0.15s, background 0.15s;
  z-index: 10;
}
.canvas-scroll-top.visible { opacity: 1; pointer-events: auto; }
.canvas-scroll-top:hover { background: var(--border); color: var(--text); }

#workspace {
  display: none;
  width: 100%;
  height: 100%;
}
body.has-doc #workspace { display: flex; }

.canvas-workspace {
  width: 100%;
  height: 100%;
  overflow: auto;
}

.canvas-pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 20px 80px;
  gap: 40px;
  min-width: 100%;
  min-height: 100%;
}

.canvas-page {
  background: var(--surface);
  color: #1a1a1a;
  border: 1px solid var(--border); 
  padding: 5%;
  flex-shrink: 0;
  font-family: 'Georgia', 'Times New Roman', serif;
  font-size: 100%;
  line-height: 1.5;
  animation: page-appear 0.35s ease-out;
}

@keyframes page-appear {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Welcome ───────────────────────────────────────────────────── */
body:not(.has-doc) #panel-left,
body:not(.has-doc) #panel-right { display: none !important; }
body:not(.has-doc) #app {
  grid-template-columns: 0 1fr 0;
}

#welcome-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
  z-index: 10;
}
.welcome-hint-logo {
  width: 300px;
  height: 300px;
  object-fit: contain;
  opacity: 0.2;
  margin-bottom: 24px;
}
.welcome-hint-text {
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
  user-select: none;
}
body.has-doc #welcome-hint { display: none; }

#welcome-panel {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  background: var(--panel);
  border-radius: 50px;
  box-shadow: 0 8px 32px #0006, 0 1px 0 #ffffff10 inset;
  z-index: 100;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
#welcome-panel.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
  pointer-events: none;
}
body.has-doc #welcome-panel { display: none; }

.welcome-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  opacity: 0.9;
}
.welcome-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  white-space: nowrap;
}
.welcome-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
}
.nd-btn {
  padding: 7px 22px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text);
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.nd-btn:hover {
  background: var(--panel);
  border-color: var(--border);
}
.nd-btn-primary {
  background: #0078d4;
  border-color: #0078d4;
  color: #fff;
}
.nd-btn-primary:hover {
  background: #1a8ae6;
  border-color: #1a8ae6;
}

/* ─── Page Blocks ───────────────────────────────────────────────── */
.block {
  padding: 4px 6px;
  margin-bottom: 0;
  border-radius: 3px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: border-color 0.1s, background 0.1s;
}
.block:hover { border-color: var(--accent); }
.block.selected { border-color: var(--accent); }

.block .block-inner {
  min-height: 1.4em;
  margin: 0;
  outline: none;
}
.block .block-inner:empty::before { content: '\00a0'; }
.block .block-inner:focus { border-radius: 2px; }

.block h1, .block h2, .block h3 { margin: 0; }
.block hr { border: none; border-top: 1px solid #ccc; margin: 12px 0; }
.block ul, .block ol { margin: 0; padding-left: 1.5em; list-style-position: outside; }
.block li {
  margin-bottom: 0.4em;
  outline: none;
  min-height: 1.4em;
}
.block li:focus { background: var(--block-focus); border-radius: 2px; }
.block li:empty::before { content: 'New item…'; color: #999; font-style: italic; }
.block .block-list { list-style-position: outside; }

.block-structural {
  user-select: none;
  padding: 8px;
  margin: 12px 0;
}
.block-structural hr { border: none; border-top: 1px solid #ccc; margin: 0; }
.structural-label {
  text-align: center;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #999;
  padding: 8px 0;
  border-top: 1px dashed #ccc;
  border-bottom: 1px dashed #ccc;
}
.block-page-break .structural-label { border-color: #aaa; color: #777; }
.block-chapter-break .structural-label { border-color: #4a9eff; color: #4a9eff; font-weight: 600; }

.block-image img { max-width: 100%; height: auto; display: block; cursor: pointer; }
.block-image img:hover { opacity: 0.85; }
.image-placeholder {
  background: var(--panel-bg);
  border: 2px dashed var(--border);
  padding: 32px;
  text-align: center;
  color: #999;
  border-radius: 3px;
  cursor: pointer;
}

.page-empty {
  color: #999;
  font-style: italic;
  text-align: center;
  padding: 48px 0;
}

/* ─── Block Handles ────────────────────────────────────────────── */
.block-handle {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 30px;
  background: var(--accent);
  border: none;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, background 0.15s;
  z-index: 50;
}
.block-handle.visible {
  opacity: 1;
  pointer-events: auto;
}
.block-handle:hover,
.block-handle.active {
  background: var(--accent-hover);
}
.drag-handle {
  cursor: grab;
  color: var(--text-dim);
  background-color: transparent;
  border-radius: 0px;
}
.drag-handle:hover,
.drag-handle:active {
  cursor: grabbing;
  background-color: transparent;
}
.delete-handle {
  color: var(--text-dim);
  background-color: transparent;
  border-radius: 0px;
}
.delete-handle:hover,
.delete-handle:active {
  color: #e55;
  background-color: transparent;
}

.block-drag-indicator {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  pointer-events: none;
  z-index: 60;
}

.block.dragging {
  opacity: 0.4;
}

/* ─── Insert Menu ──────────────────────────────────────────────── */
.insert-menu {
  position: fixed;
  display: none;
  width: 180px;
  max-height: 320px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 20px #0005, 0 1px 4px #0003;
  padding: 4px 0;
  z-index: 100;
  outline: none;
}
.insert-menu.open { display: block; }

.insert-menu-section {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  padding: 8px 12px 4px;
  user-select: none;
}

.insert-menu-item {
  padding: 6px 12px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  border-radius: 4px;
  margin: 0 4px;
  transition: background 0.1s;
}
.insert-menu-item:hover,
.insert-menu-item.focused {
  background: var(--accent);
  color: #fff;
}

/* ─── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}
.btn:hover { background: var(--panel-bg); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

/* ─── Dialog Overlay ────────────────────────────────────────────── */
#dialog-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: #000a;
  z-index: 2000;
  align-items: center;
  justify-content: center;
}
#dialog-overlay.open { display: flex; }

.dialog {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-width: 340px;
  max-width: 420px;
  box-shadow: 0 8px 32px #0006;
}
.dialog-header {
  padding: 14px 20px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.dialog-body {
  padding: 20px;
}
.dialog-body label {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--text-dim);
}
.dialog-body input,
.dialog-body select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 7px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 13px;
}
.dialog-body input:focus,
.dialog-body select:focus { outline: none; border-color: var(--accent); }
.dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

/* ─── No-doc state ──────────────────────────────────────────────── */
body:not(.has-doc) #panel-left,
body:not(.has-doc) #panel-right { display: none; }
body:not(.has-doc) #app {
  grid-template-columns: 0 1fr 0;
}

/* ─── Book Metadata Panel ──────────────────────────────────────── */
.bm-field { margin-bottom: 10px; }
.bm-textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 4px 6px;
  font-size: 11px;
  font-family: inherit;
  resize: vertical;
  min-height: 48px;
}
.bm-textarea:focus { outline: none; border-color: var(--accent); }
.bm-required::after { content: ' *'; color: var(--accent); }
.bm-warning { border-color: #e5a530 !important; }
.bm-cover-preview {
  width: 100%;
  max-height: 160px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 8px;
}
.bm-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-size: 11px;
}
.bm-checkbox input[type="checkbox"] { accent-color: var(--accent); }
.bm-cover-actions { display: flex; gap: 6px; }
.bm-cover-btn { font-size: 11px; padding: 4px 10px; }
.bm-cover-remove { color: var(--danger); }

/* ─── EPUB Export Dialog ───────────────────────────────────────── */
.epub-export-dialog {
  min-width: 640px;
  max-width: 780px;
  width: 90vw;
}
.epub-export-body {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 20px;
  padding: 20px;
  max-height: 70vh;
  overflow-y: auto;
}
.epub-export-left, .epub-export-right { min-width: 0; }
.epub-export-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  margin-bottom: 8px;
  margin-top: 12px;
}
.epub-export-section-title:first-child { margin-top: 0; }
.epub-export-field { margin-bottom: 10px; }
.epub-export-label {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 3px;
}
.epub-export-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 5px 8px;
  font-size: 12px;
  font-family: inherit;
}
textarea.epub-export-input { resize: vertical; min-height: 40px; }
.epub-export-input:focus { outline: none; border-color: var(--accent); }
.epub-export-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-size: 12px;
}
.epub-export-checkbox input[type="checkbox"] { accent-color: var(--accent); }
.epub-export-validation { margin-bottom: 12px; }
.epub-export-check { font-size: 12px; margin-bottom: 3px; }
.check-ok { color: #4caf50; }
.check-warn { color: #e5a530; }
.check-error { color: var(--danger); }
.epub-export-info-row { font-size: 12px; color: var(--text-dim); margin-bottom: 2px; }
.epub-export-file {
  font-size: 12px;
  color: var(--text);
  background: var(--bg);
  padding: 6px 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: monospace;
}
.epub-export-cover { margin-bottom: 8px; }
.epub-export-cover-preview {
  width: 100%;
  max-height: 120px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 8px;
}
.epub-export-cover-actions { display: flex; gap: 6px; }
.epub-export-score {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.score-label { font-size: 11px; color: var(--text-dim); font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px; }
.score-value { font-size: 14px; font-weight: 700; color: var(--accent); }
.epub-export-remember {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-dim);
  margin-right: auto;
  cursor: pointer;
}
.epub-export-remember input[type="checkbox"] { accent-color: var(--accent); }

/* ─── HTML Export Dialog ───────────────────────────────────────── */
.html-export-dialog {
  min-width: 380px;
  max-width: 440px;
  width: 90vw;
}
.html-export-body {
  padding: 20px;
}
.html-export-section {
  margin-bottom: 16px;
}
.html-export-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.html-export-info-row {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 2px;
}
.html-export-info-row strong {
  color: var(--text);
  font-size: 13px;
}
.html-export-preview {
  font-size: 11px;
  font-family: monospace;
  color: var(--text);
  background: var(--bg);
  padding: 8px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  white-space: pre;
  line-height: 1.6;
}
.html-export-warning {
  font-size: 12px;
  color: #e5a530;
  margin-bottom: 3px;
}
.html-export-check-ok {
  font-size: 12px;
  color: #4caf50;
  margin-bottom: 3px;
}
.html-export-label {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 3px;
}
.html-export-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 5px 8px;
  font-size: 12px;
  font-family: inherit;
}
.html-export-input:focus { outline: none; border-color: var(--accent); }
.html-export-hint {
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 3px;
}

/* ─── Code Panel ───────────────────────────────────────────────── */
.code-panel {
  display: none;
  position: fixed;
  bottom: 32px;
  right: 8px;
  width: 480px;
  height: 340px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 32px #0006;
  z-index: 200;
  flex-direction: column;
  overflow: hidden;
}
.code-panel.open { display: flex; }

.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}

.code-panel-tabs {
  display: flex;
  gap: 2px;
  
}

.code-panel-tab {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.code-panel-tab:hover { color: var(--text); background: var(--hover); }
.code-panel-tab.active { color: var(--accent); background: rgba(99,102,241,0.12); }

.code-panel-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}
.code-panel-close:hover { color: var(--text); background: var(--hover); }

.code-panel-body {
  flex: 1;
  overflow: hidden;
}

.code-panel-editor {
  width: 100%;
  height: 100%;
  background: #1a1a2e;
  color: #d4d4d4;
  border: none;
  padding: 12px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.5;
  resize: none;
  outline: none;
  tab-size: 2;
}
.code-panel-editor[readonly] { opacity: 0.85; }

.code-panel-resize {
  position: absolute;
  z-index: 1;
}
.code-panel-resize--top {
  top: -3px; left: 8px; right: 0;
  height: 6px;
  cursor: ns-resize;
}
.code-panel-resize--left {
  top: 8px; left: -3px; bottom: 0;
  width: 6px;
  cursor: ew-resize;
}
.code-panel-resize--top-left {
  top: -3px; left: -3px;
  width: 12px; height: 12px;
  cursor: nwse-resize;
}

/* ─── Scrollbar ─────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border); }

/* ─── Print ────────────────────────────────────────────────────── */
@media print {
  #header, #panel-left, #panel-right, #welcome-panel,
  .panel-resize-handle, .code-panel, .block-handle,
  .insert-menu, .canvas-scroll-top, .page-type-picker { display: none !important; }

  #app {
    display: block !important;
    width: auto !important;
    height: auto !important;
  }

  #workspace-container, #workspace, .canvas-workspace {
    display: block !important;
    width: auto !important;
    height: auto !important;
    overflow: visible !important;
    position: static !important;
  }

  .canvas-pages {
    padding: 0 !important;
    gap: 0 !important;
    min-width: 0 !important;
    min-height: 0 !important;
  }

  .canvas-page {
    border: none !important;
    box-shadow: none !important;
    padding: 0.75in !important;
    margin: 0 !important;
    width: 100% !important;
    max-width: none !important;
    page-break-after: always;
    animation: none !important;
  }
  .canvas-page:last-child { page-break-after: auto; }

  body, html { height: auto; overflow: visible; }
  body { background: var(--bg); color: black; }
}

.book-scene {
  pointer-events: auto;
}

.book-scene {
  --book-w: 240px;
  --book-h: 360px;
  --book-d: 37px;

  perspective: 1280px;
  width: var(--book-w);
  height: var(--book-h);
  cursor: grab;
}
.book-scene.dragging { cursor: grabbing; }

.book-scene.dragging { cursor: grabbing; }
 
  /* while open, take the book out of the page layout entirely and
     center it in the viewport — its position no longer depends on
     where it sits inside any panel, so it can never end up clipped
     or pushed off-screen by a surrounding container */
  .book-scene.overlay-open {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
  }
  .overlay-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(20, 18, 14, 0.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
    z-index: 9998;
  }
  .overlay-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
  }
 
  .book {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transform: rotateX(-14deg) rotateY(-32deg);
    transition: transform 0.15s ease-out;
    will-change: transform;
  }
  .book.no-transition { transition: none; }
 
  .book-face {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--book-w);
    height: var(--book-h);
    backface-visibility: hidden;
    overflow: hidden;
  }
  .book-face img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
    -webkit-user-drag: none;
  }
 
  /* page revealed once the cover swings open — fades out so it
     doesn't visually block the open cover (CSS 3D has no real
     depth-testing between overlapping same-size flat panels) */
  .book-inside-front {
    transform: translateZ(calc(var(--book-d) / 2 - 1px));
    background: #f2ede2;
    transition: opacity 0.4s ease;
  }
  .book.is-open .book-inside-front {
    opacity: 1;
  }
  .page-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 0 24px;
    text-align: center;
    color: #a89f8c;
    font-size: 13px;
    letter-spacing: 0.05em;
  }
 
  /* front cover — hinges open on the spine edge */
  .book-cover {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--book-w);
    height: var(--book-h);
    transform-style: preserve-3d;
    transform-origin: left center;
    transform: translateZ(calc(var(--book-d) / 2)) rotateY(0deg);
    transition: transform 0.9s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .book.is-open .book-cover {
    transform: translateZ(calc(var(--book-d) / 2)) rotateY(-120deg);
  }
 
  .cover-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    overflow: hidden;
    border-radius: 0 3px 3px 0;
    background: #f2ede2;
  }
  .cover-face img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
    -webkit-user-drag: none;
  }
  .cover-outer { transform: rotateY(0deg); }
 
  /* back face is mirrored by rotateY(180deg) by definition —
     flip the image back so it reads correctly once visible */
  .cover-inner { transform: rotateY(180deg); }
  .cover-inner img { transform: scaleX(-1); }
 
  .book-back {
    transform: rotateY(180deg) translateZ(calc(var(--book-d) / 2));
    border-radius: 3px 0 0 3px;
    background: #f2ede2;
  }
  .book-spine {
    width: var(--book-d);
    left: calc((var(--book-w) - var(--book-d)) / 2);
    transform: rotateY(-90deg) translateZ(calc(var(--book-w) / 2));
    background: #8a6b4f;
  }
  .book-pages {
    width: var(--book-d);
    left: calc((var(--book-w) - var(--book-d)) / 2);
    transform: rotateY(90deg) translateZ(calc(var(--book-w) / 2));
    background: repeating-linear-gradient(
      90deg,
      #fbf9f2 0px, #fbf9f2 1px,
      #e9e4d6 1px, #e9e4d6 2px
    );
  }
  .book-top {
    height: var(--book-d);
    top: calc((var(--book-h) - var(--book-d)) / 2);
    transform: rotateX(90deg) translateZ(calc(var(--book-h) / 2));
    background: repeating-linear-gradient(
      0deg,
      #fbf9f2 0px, #fbf9f2 1px,
      #e9e4d6 1px, #e9e4d6 2px
    );
  }
  .book-bottom {
    height: var(--book-d);
    top: calc((var(--book-h) - var(--book-d)) / 2);
    transform: rotateX(-90deg) translateZ(calc(var(--book-h) / 2));
    background: #d9d3c4;
  }
 
  /* ============ placeholder art (swap for real <img> sources) ============ */
  .ph-front {
    background:
      linear-gradient(135deg, rgba(255,255,255,0.15), transparent 40%),
      linear-gradient(160deg, #4a5c46, #b9c98c 55%, #e8e2c8 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #1c1c18;
    text-align: center;
  }
  .ph-front .title { font-size: 24px; font-weight: bold; line-height: 1.15; }
  .ph-front .sub { font-size: 10px; letter-spacing: 0.1em; margin-top: 10px; opacity: 0.7; }
 
  .ph-inner {
    height: 100%;
    background: repeating-linear-gradient(45deg, #efe9da, #efe9da 8px, #e6ddc8 8px, #e6ddc8 16px);
  }
 
  .ph-back {
    height: 100%;
    background: linear-gradient(160deg, #3f4d3c, #90a06a 100%);
  }
 
  .ph-spine {
    height: 100%;
    background: #8a6b4f;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .ph-spine span {
    writing-mode: vertical-rl;
    color: #f2ede2;
    font-size: 11px;
    letter-spacing: 0.08em;
  }