@font-face {
  font-family: 'CMU Serif';
  src: url('../fonts/cmu-serif/cmunrm.ttf') format('truetype');
  font-style: normal;
  font-weight: 400;
  font-display: block;
}

@font-face {
  font-family: 'CMU Serif';
  src: url('../fonts/cmu-serif/cmunbx.ttf') format('truetype');
  font-style: normal;
  font-weight: 700;
  font-display: block;
}

@font-face {
  font-family: 'CMU Serif';
  src: url('../fonts/cmu-serif/cmunti.ttf') format('truetype');
  font-style: italic;
  font-weight: 400;
  font-display: block;
}

@font-face {
  font-family: 'CMU Serif';
  src: url('../fonts/cmu-serif/cmunbi.ttf') format('truetype');
  font-style: italic;
  font-weight: 700;
  font-display: block;
}

.opening-map-repertoire-document {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  outline: none;
  border-radius: 0;
  box-sizing: border-box;
  overflow: hidden;
  color: var(--map-text);
  background: var(--map-bg);
  font: 400 15px/1.5 var(--map-ui-font);
}

.opening-map-repertoire-document[open] {
  display: flex;
  flex-direction: column;
}

.opening-map-repertoire-document::backdrop {
  background: var(--map-bg);
}

/* The editing controls occupy the page's existing top row, without a header. */
.opening-map-document-toolbar {
  --document-toolbar-section-gap: 16px;
  position: sticky;
  z-index: 3;
  top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  width: max-content;
  max-width: 100%;
  height: 36px;
  margin: -50px auto 14px;
  background: var(--map-panel-solid);
  font: 400 15px/1.5 var(--map-ui-font);
}

.opening-map-document-toolbar > button,
.opening-map-document-symbol-control > button {
  min-height: 36px;
  color: var(--map-muted);
  font: inherit;
  border: 0;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}

.opening-map-document-toolbar button:enabled:hover {
  color: var(--map-text);
  background: var(--map-control-hover);
}

.opening-map-document-toolbar button:disabled {
  opacity: 0.45;
  cursor: default;
}

@media (min-width: 821px) {
  .opening-map-document-toolbar {
    position: absolute;
    box-sizing: border-box;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    justify-content: flex-start;
    gap: 2px;
    width: max-content;
    min-height: 44px;
    margin: 0;
    padding: 3px;
    border: 1px solid var(--map-border);
    background: var(--map-bg);
  }
  .opening-map-document-toolbar .opening-map-document-format-menu,
  .opening-map-document-toolbar .opening-map-document-layout-popover,
  .opening-map-document-toolbar .opening-map-document-zoom-popover {
    top: calc(100% + 12px);
  }
}

/* Paper commands act locally; saved papers live in the sidebar. */
.opening-map-document-paper-actions {
  display: contents;
}
.opening-map-document-toolbar .opening-map-document-layout-control {
  order: 1;
}
.opening-map-document-toolbar .opening-map-document-zoom {
  order: 2;
  margin-inline-start: 0;
}
.opening-map-document-toolbar .opening-map-document-export-pdf {
  position: relative;
  order: 3;
}
.opening-map-document-toolbar .opening-map-document-layout-control,
.opening-map-document-toolbar .opening-map-document-export-pdf {
  margin-inline-start: var(--document-toolbar-section-gap);
}
.opening-map-document-toolbar .opening-map-document-layout-control::before,
.opening-map-document-toolbar .opening-map-document-export-pdf::before {
  content: '';
  position: absolute;
  inset: 6px auto 6px calc(-1px - var(--document-toolbar-section-gap) / 2);
  width: 1px;
  background: var(--map-border);
  pointer-events: none;
}
.opening-map-repertoire-document:not([data-paper-mode='edit']) .opening-map-document-toolbar > :is(.opening-map-document-format-control, .opening-map-document-insert-game, .opening-map-document-insert-diagram, .opening-map-document-symbol-control),
.opening-map-repertoire-document[data-editable='false'] .opening-map-document-toolbar > :is(.opening-map-document-format-control, .opening-map-document-insert-game, .opening-map-document-insert-diagram, .opening-map-document-symbol-control),
.opening-map-repertoire-document:not([data-paper-mode='edit']) .opening-map-document-layout-control,
.opening-map-repertoire-document[data-editable='false'] .opening-map-document-layout-control {
  display: none;
}
.opening-map-document-study-shortcut {
  order: 4;
}
.opening-map-document-layout-control { position: relative; }
.opening-map-document-layout-button,
.opening-map-document-paper-actions > .opening-map-document-export-pdf,
.opening-map-document-layout-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-muted);
  font: 400 15px/1.5 var(--map-ui-font);
  cursor: pointer;
}
.opening-map-document-paper-actions img { display: block; filter: var(--map-icon-filter); }
.opening-map-document-layout-button[aria-expanded='true'] { background: var(--map-control-hover); color: var(--map-text); }
.opening-map-document-layout-popover:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-layout-popover {
  position: absolute;
  z-index: 5;
  inset: calc(100% + 8px) 0 auto auto;
  width: 320px;
  max-width: calc(100vw - 48px);
  max-height: calc(100dvh - 80px);
  overflow: auto;
  padding: 12px 16px 16px;
  box-sizing: border-box;
  border: 1px solid var(--map-border-strong);
  background: var(--map-panel-solid);
  color: var(--map-text);
  font: 400 15px/1.5 var(--map-ui-font);
}
.opening-map-document-layout-popover[hidden] { display: none; }
.opening-map-document-layout-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  font-weight: 500;
}

.opening-map-document-format-control { position: relative; display: flex; }
.opening-map-document-format-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-muted);
  cursor: pointer;
}
.opening-map-document-format-button img { filter: var(--map-icon-filter); }
.opening-map-document-format-button[aria-expanded='true'] { background: var(--map-control-hover); }
.opening-map-document-format-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  display: grid;
  width: 184px;
  padding: 4px;
  border: 1px solid var(--map-border-strong);
  background: var(--map-panel-solid);
}
.opening-map-document-format-menu[hidden] { display: none; }
.opening-map-document-format-option {
  min-height: 40px;
  padding: 8px 12px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.opening-map-document-format-option[aria-checked='true'] { background: var(--map-control-hover); }
.opening-map-document-toolbar button:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-toolbar :is(.opening-map-document-insert-game, .opening-map-document-insert-diagram, .opening-map-document-insert-symbol) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  padding: 0;
}
.opening-map-document-toolbar-icon {
  font: 400 22px/1 Georgia, 'Times New Roman', serif;
}

.opening-map-document-zoom { position: relative; margin-left: 8px; }
.opening-map-document-zoom[hidden] { display: none; }
.opening-map-document-zoom button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--map-muted);
  font: 400 15px/1.5 var(--map-ui-font);
  cursor: pointer;
}
.opening-map-document-zoom button[aria-pressed='true'],
.opening-map-document-zoom-trigger[aria-expanded='true'] { background: var(--map-control-hover); color: var(--map-text); }
.opening-map-document-zoom img { display: block; width: 20px; height: 20px; filter: var(--map-icon-filter); }
.opening-map-document-zoom-value { min-width: 4ch; text-align: right; font-variant-numeric: tabular-nums; }
.opening-map-document-zoom-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 280px;
  padding: 12px;
  border: 1px solid var(--map-border-strong);
  background: var(--map-panel-solid);
  box-sizing: border-box;
}
.opening-map-document-zoom-popover[hidden] { display: none; }
.opening-map-document-zoom-slider-row { display: flex; align-items: center; gap: 8px; }
.opening-map-document-zoom-step { flex: 0 0 36px; width: 36px; }
.opening-map-document-zoom-slider { min-width: 0; width: 100%; height: 36px; margin: 0; accent-color: var(--map-accent); }
.opening-map-document-zoom-slider:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-zoom-presets { display: flex; justify-content: space-between; gap: 8px; margin-top: 8px; }
.opening-map-document-zoom-presets button { flex: 1; }
.opening-map-document-zoom-presets button[hidden] { display: none; }

.opening-map-document-settings { display: grid; gap: 12px; }
.opening-map-document-setting {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 120px;
  align-items: center;
  gap: 12px;
  font: 400 15px/1.5 var(--map-ui-font);
}
.opening-map-document-setting[hidden] { display: none; }
.opening-map-document-setting > span { color: var(--map-muted); }
.opening-map-document-setting select {
  width: 100%;
  min-width: 0;
  min-height: 36px;
  padding: 5px 8px;
  border: 1px solid var(--map-border);
  border-radius: 0;
  background: var(--map-panel-solid);
  color: var(--map-text);
  font: inherit;
  cursor: pointer;
}
.opening-map-document-setting select:disabled { opacity: 0.45; cursor: default; }
.opening-map-document-setting select:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-setting output { padding: 6px 9px; }
.opening-map-document-range-setting { grid-template-columns: minmax(0, 1fr) auto; row-gap: 0; }
.opening-map-document-setting-range { display: contents; }
.opening-map-document-setting-range input { grid-column: 1 / -1; grid-row: 2; min-width: 0; width: 100%; margin: 0; height: 36px; accent-color: var(--map-accent); }
.opening-map-document-setting-range input:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-setting-range output { grid-column: 2; grid-row: 1; padding: 0; text-align: right; font-variant-numeric: tabular-nums; }
.opening-map-document-settings-error { margin: 0; color: var(--map-bad); font: 400 15px/1.5 var(--map-ui-font); }

.opening-map-document-symbol-control { position: relative; display: flex; }
.opening-map-document-insert-symbol[aria-expanded='true'] { background: var(--map-control-hover); }

.opening-map-repertoire-document-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 7px 12px;
  border: 1px solid var(--map-border);
  border-radius: 0;
  background: transparent;
  color: var(--map-text);
  font: 400 15px/20px var(--map-ui-font);
  white-space: nowrap;
  cursor: pointer;
}

.opening-map-repertoire-document-action:enabled:hover {
  background: var(--map-control-hover);
  border-color: var(--map-border-strong);
}

.opening-map-repertoire-document-action:disabled {
  cursor: default;
  opacity: 0.45;
}

.opening-map-repertoire-document button:focus-visible {
  outline: var(--document-focus-outline, 2px solid var(--map-accent));
  outline-offset: 2px;
}

.opening-map-repertoire-document-workspace {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 0;
  box-sizing: border-box;
  background: var(--map-panel-solid);
}

.opening-map-repertoire-document-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 348px;
  align-items: stretch;
  min-height: 100%;
}

.opening-map-repertoire-document-content {
  position: relative;
  width: 100%;
  max-width: 816px;
  min-width: 0;
  margin: 0 auto;
  padding: 64px 48px;
  box-sizing: border-box;
}

.opening-map-repertoire-document-delete-confirmation {
  position: absolute;
  z-index: 2;
  left: 48px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: max-content;
  max-width: calc(100% - 96px);
  box-sizing: border-box;
  padding: 8px 12px;
  border: 1px solid var(--map-border-strong);
  background: var(--map-panel-solid);
  color: var(--map-text);
  font: 400 15px/1.4 var(--map-ui-font);
}

.opening-map-repertoire-document-delete-action {
  padding: 3px 6px;
  border: 0;
  background: transparent;
  color: var(--map-accent);
  font: inherit;
  cursor: pointer;
}

.opening-map-repertoire-document-delete-action:enabled:hover {
  background: var(--map-control-hover);
}

.opening-map-repertoire-document-delete-action:disabled {
  opacity: 0.45;
  cursor: default;
}

.opening-map-repertoire-document-editor {
  min-height: 180px;
  outline: none;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 400 var(--document-font-size)/1.85 Georgia, 'Times New Roman', serif;
  caret-color: var(--map-text);
}

.opening-map-repertoire-document-editor:is([data-document-root-selected], [data-document-placeholder-selected], [data-document-move-selected], [data-document-diagram-selected]) {
  caret-color: transparent;
}

.opening-map-repertoire-document-editor .opening-map-document-diagram[data-document-diagram-source] {
  display: none;
}
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-diagram[data-document-diagram-source] {
  display: inline;
}
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-diagram[data-document-diagram-presentation] {
  display: none;
}

.opening-map-repertoire-document-editor [data-document-move-caret]:empty {
  display: inline-block;
  min-height: 1em;
}

/* Keep presentation-only blocks out of native paragraph splitting during edits. */
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-diagram,
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-repertoire-document-variation {
  display: inline;
}

.opening-map-repertoire-document-editor [data-document-line] {
  min-height: 1.85em;
  margin: 0;
}

.opening-map-repertoire-document-editor [data-document-flow-boundary] {
  display: none;
}

.opening-map-repertoire-document-editor [data-document-line='title'] {
  position: relative;
  min-height: 1.3em;
  margin-bottom: 4px;
  font: 500 1.777778em/1.3 Georgia, 'Times New Roman', serif;
}

.opening-map-repertoire-document-editor [data-document-line='description'] {
  margin-bottom: 16px;
  color: var(--map-muted);
}

.opening-map-repertoire-document-editor :is([data-document-byline-source], [data-document-youtube-link])[href] {
  color: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

.opening-map-repertoire-document-editor[contenteditable='true']:not([data-document-link-navigation]) :is([data-document-byline-source], [data-document-youtube-link])[href] {
  cursor: text;
}

.opening-map-repertoire-document-editor :is([data-document-byline-source], [data-document-youtube-link])[href]:focus-visible {
  outline: var(--document-focus-outline, 1px solid var(--map-accent));
  outline-offset: 2px;
}

.opening-map-repertoire-document-editor [data-document-youtube-link] {
  hyphens: none;
}

.opening-map-repertoire-document-editor [data-document-line='body'][data-document-heading-level] {
  min-height: 1.4em;
  margin: 28px 0 12px;
  font-family: Georgia, 'Times New Roman', serif;
  font-weight: 500;
  line-height: 1.4;
  scroll-margin-top: 76px;
}
.opening-map-repertoire-document-editor [data-document-heading-level='1'] { font-size: 1.444444em; }
.opening-map-repertoire-document-editor [data-document-heading-level='2'] { font-size: 1.222222em; }
.opening-map-repertoire-document-editor [data-document-heading-level='3'] { font-size: 1.055556em; }

.opening-map-repertoire-document-editor [data-document-title-placeholder]::before {
  content: attr(data-document-title-placeholder);
  position: absolute;
  inset: 0;
  color: var(--map-muted);
  pointer-events: none;
  user-select: none;
}

.opening-map-repertoire-document-move {
  --document-move-hanging-padding: 0px;
  display: inline-block;
  margin: 0 4px 2px 0;
  padding: 2px 4px;
  color: inherit;
  background: transparent;
  font: inherit;
  white-space: nowrap;
  cursor: pointer;
}

.opening-map-document-move-placeholder {
  display: inline-block;
  margin: 0 4px 2px 0;
  padding: 1px 7px;
  border: 1px dashed var(--map-border);
  color: var(--map-muted);
  font: inherit;
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
}

.opening-map-document-move-placeholder[aria-current='step'] {
  border-style: solid;
  border-color: var(--map-accent);
  background: var(--map-control-hover);
  color: var(--map-accent);
}

.opening-map-repertoire-document-editor [data-document-line='body']:not([data-document-paragraph-style='moves'])
  :is(.opening-map-repertoire-document-move, .opening-map-document-move-placeholder) {
  line-height: 1.2;
  margin-bottom: 0;
}

.opening-map-repertoire-document-variation {
  display: block;
  margin: 8px 0 8px 20px;
  padding-left: 12px;
  border-left: 1px solid var(--map-border);
  color: var(--map-muted);
}

.opening-map-repertoire-document-notation-delimiter {
  display: none;
}

@media screen {
  /* Boards keep their square layout box while offscreen SVGs skip rendering. */
  .opening-map-repertoire-document-editor .opening-map-document-diagram-board {
    content-visibility: auto;
  }
  .opening-map-repertoire-document-editor .opening-map-document-diagram.is-selected .opening-map-document-diagram-board {
    content-visibility: visible;
  }
}

@media (min-width: 821px), print {
  .opening-map-repertoire-document-editor[data-document-move-layout='paired'] .opening-map-repertoire-document-variation {
    margin-inline: 0;
    padding-left: 0;
    border-left: 0;
    color: inherit;
  }

  .opening-map-repertoire-document-editor[data-document-move-layout='paired'] .opening-map-repertoire-document-variation .opening-map-repertoire-document-variation {
    margin-inline-start: 1em;
    margin-block: 0.4em 0.5em;
  }

  /* Nesting guides share the existing gutter; their border and padding replace
     indentation rather than taking width from the move text. */
  .opening-map-repertoire-document-editor[data-document-move-layout='paired']:not([data-document-atom-editing])
    .opening-map-repertoire-document-variation
    .opening-map-repertoire-document-variation:not([data-document-variation-inline]):not([data-document-diagram-continuation-before]):not([data-document-diagram-continuation-after]) {
    --document-variation-guide-inset: max(2px, 0.75em / (var(--document-variation-depth) - 1));
    margin-inline-start: calc(1em - var(--document-variation-guide-inset));
    padding-inline-start: calc(var(--document-variation-guide-inset) - 1px);
    border-inline-start: 1px solid var(--map-border);
  }

  .opening-map-repertoire-document-editor[data-document-move-layout] .opening-map-repertoire-document-variation[data-document-variation-inline] {
    display: inline;
    margin: 0;
    padding: 0;
    border: 0;
    color: inherit;
  }

  .opening-map-document-move-row {
    position: relative;
    display: grid;
    grid-template-columns: 2em repeat(2, minmax(0, 1fr));
    column-gap: 0.35em;
    align-items: baseline;
    justify-items: center;
    width: min(100%, 15em);
    margin-inline: auto;
    text-align: start;
    text-align-last: start;
    break-inside: avoid;
  }

  /* A move's own side diagram shares its row and following explanation. */
  .opening-map-document-move-row[data-document-diagram-beside] {
    width: auto;
    max-width: 15em;
  }
  .opening-map-repertoire-document-editor[data-document-columns]
    [data-document-line='body']:has(> .opening-map-document-move-row[data-document-diagram-beside]) {
    display: flow-root;
  }

  .opening-map-document-move-row::before {
    content: attr(data-document-row-number) '.';
    grid-column: 1;
    grid-row: 1;
    justify-self: end;
  }

  .opening-map-document-move-row > [data-document-move-cell='white'] { grid-column: 2; grid-row: 1; }
  .opening-map-document-move-row > [data-document-move-cell='black'] { grid-column: 3; grid-row: 1; }
  .opening-map-document-move-row [data-document-move-number] { display: none; }
  .opening-map-document-move-cell { min-width: 0; text-align: center; text-align-last: center; }

  /* Missing moves are presentation only, outside editable and saved text. */
  .opening-map-document-move-row::after {
    grid-row: 1;
    margin-right: 4px;
    user-select: none;
    pointer-events: none;
  }
  .opening-map-document-move-row:not(:has(> [data-document-move-cell='white']))::after {
    content: '...';
    grid-column: 2;
  }
  .opening-map-document-move-row:not(:has(> [data-document-move-cell='black']))::after {
    content: '...';
    grid-column: 3;
  }
}

/* Native editing needs inline atoms at every viewport width. An editable
   inline-block can be cloned when the browser splits its paragraph. */
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-move-row { display: inline; }
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-move-row::before,
.opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-move-row::after { content: none; }
.opening-map-repertoire-document-editor[data-document-atom-editing] [data-document-move-number] { display: inline; }

.opening-map-repertoire-document-editor[data-document-paragraph-editing]
  :is(.opening-map-document-move-row, .opening-map-document-move-cell) {
  text-align: inherit;
  text-align-last: inherit;
}
.opening-map-repertoire-document-editor[data-document-paragraph-editing] .opening-map-repertoire-document-move {
  display: inline;
}

.opening-map-repertoire-document-move:hover {
  color: var(--map-accent);
  background: var(--map-control-hover);
}

@media (min-width: 821px) {
  .opening-map-repertoire-document-move[data-document-diagram-linked] {
    color: var(--map-accent);
    background: var(--map-control-hover);
    outline: 1px solid var(--map-accent);
    outline-offset: 2px;
  }
}

.opening-map-repertoire-document-move[aria-current='step']::selection {
  color: inherit;
  background: transparent;
}

.opening-map-repertoire-document-companion {
  position: relative;
  min-width: 0;
  padding: 0;
  box-sizing: border-box;
  border-left: 1px solid var(--map-border);
  background: var(--map-bg);
}

.opening-map-document-sidebar-resize {
  display: none;
}

@media (min-width: 821px), print {
  .opening-map-document-toolbar {
    flex-wrap: nowrap;
    height: auto;
    min-height: 36px;
  }

  .opening-map-repertoire-document-content[data-document-columns] { padding-inline: clamp(40px, 5vw, 80px); }
  .opening-map-repertoire-document-content:is([data-document-page-layout='a4'], [data-document-page-layout='a5']) {
    max-width: 1120px;
    padding-inline: 24px;
  }

  .opening-map-repertoire-document-editor[data-document-columns] {
    font: 400 var(--document-font-size)/1.3 'CMU Serif';
    font-kerning: normal;
    font-variant-ligatures: common-ligatures;
    orphans: 3;
    widows: 3;
  }

  /* Use the text's baseline for both empty carets and the text entered into them. */
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-move-caret]:empty {
    display: inline;
    min-height: 0;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='title'],
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='description'] {
    column-span: all;
    text-align: center;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='title'] {
    font: 700 1.666667em/1.2 'CMU Serif';
    margin-bottom: 0.15em;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='description'] {
    min-height: 1.3em;
    margin-bottom: 1.5em;
    font-style: italic;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body'] {
    min-height: 1.3em;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:not([data-document-heading-level]) {
    text-align: justify;
    text-align-last: start;
    hyphens: auto;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-paragraph-style='moves']:has([data-repertoire-node-id]) {
    text-align: start;
    hyphens: manual;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:not([data-document-heading-level]):not(:empty):not(:has(> br:only-child)) {
    margin-bottom: 0.5em;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:not([data-document-heading-level]):not(:empty):not(:has(> br:only-child))[data-document-move-continuation-before],
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-repertoire-document-variation[data-document-move-continuation-before] {
    margin-block-end: 0;
  }

  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-repertoire-document-variation[data-document-move-continuation-after] {
    margin-block-start: 0;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-heading-level] {
    margin: calc(var(--document-heading-spacing) * var(--document-font-size) * 1.3) 0 0.75em;
    font-family: inherit;
    font-weight: 700;
    line-height: 1.3;
    text-align: center;
    break-after: avoid-column;
  }

  /* The title and byline already space the first column set. Only add a
     heading gap when authored body content precedes it. Later column and
     page breaks discard heading margins through native fragmentation. */
  .opening-map-repertoire-document-editor[data-document-columns] > [data-document-heading-level]:nth-child(1 of [data-document-line='body']) {
    margin-block-start: 0;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-heading-level='1'] { font-size: 1.111111em; }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-heading-level='2'] { font-size: 1.055556em; }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-heading-level='3'] { font-size: 1em; }

  .opening-map-repertoire-document-editor[data-document-columns] :is(.opening-map-repertoire-document-move, .opening-map-document-move-placeholder) {
    margin: 0 0.12em 0 0;
    padding: 0 4px;
    line-height: 1.1;
  }

  /* Hang the commentary control's padding outside its text edge. Compensate
     at the end so move spacing and line wrapping retain their existing width. */
  .opening-map-repertoire-document-editor[data-document-columns]
    .opening-map-repertoire-document-move:not([data-document-move-side]):not([data-document-branch-move]) {
    --document-move-hanging-padding: 4px;
    margin-inline-start: calc(-1 * var(--document-move-hanging-padding));
    margin-inline-end: calc(0.12em + var(--document-move-hanging-padding));
  }

  /* An insertion slot must not increase its move row's line height. */
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-move-placeholder {
    border: 0;
    outline: 1px dashed var(--map-border);
    outline-offset: -1px;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-move-placeholder[aria-current='step'] {
    outline-style: solid;
    outline-color: var(--map-accent);
  }

  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-move-annotations {
    font-size: max(15px, 0.833333em);
  }

  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram {
    width: min(100%, calc(88% * var(--document-main-diagram-scale)), calc(320px * var(--document-main-diagram-scale)));
    margin-block: 1em;
    text-align: start;
    break-inside: avoid;
  }

  .opening-map-repertoire-document-editor[data-document-columns]:is([data-document-page-layout='a4'], [data-document-page-layout='a5']) .opening-map-document-diagram[data-diagram-placement='center'] {
    width: clamp(min(52%, 224px), min(calc(66% * var(--document-main-diagram-scale)), calc(240px * var(--document-main-diagram-scale))), 100%);
  }

  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram-controls {
    font-family: var(--map-ui-font);
  }

  .opening-map-repertoire-document-editor {
    margin-left: -8px;
    padding-left: 8px;
  }

  .opening-map-repertoire-document-layout {
    grid-template-columns: minmax(0, 1fr) var(--document-sidebar-width, 348px);
  }

  .opening-map-document-sidebar-resize {
    position: absolute;
    z-index: 2;
    inset: 0 auto 0 -5px;
    display: block;
    width: 10px;
    cursor: ew-resize;
    touch-action: none;
    user-select: none;
  }

  .opening-map-document-sidebar-resize::after {
    position: absolute;
    inset: 0 auto 0 4px;
    width: 2px;
    background: var(--map-accent);
    opacity: 0;
    content: '';
  }

  .opening-map-document-sidebar-resize:is(:hover, :focus-visible, [data-resizing='true'])::after {
    opacity: 1;
  }

  .opening-map-document-sidebar-resize:focus-visible {
    outline: var(--document-focus-outline, 2px solid var(--map-accent));
    outline-offset: -2px;
  }
}

@media screen and (min-width: 821px) {
  .opening-map-repertoire-document-content[data-document-page-layout='pageless'] {
    max-width: none;
    padding-inline: 24px;
  }

  .opening-map-repertoire-document-workspace:has(.opening-map-document-pages[data-document-paged='true']) {
    background-color: var(--map-bg);
    background-image:
      linear-gradient(var(--map-grid-strong) 1px, transparent 1px),
      linear-gradient(90deg, var(--map-grid-strong) 1px, transparent 1px);
    background-position: 0 0;
    background-size: 48px 48px;
  }

  /* A temporary White row continues the move section before its comment gap. */
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired']
    :is([data-document-comment-before], [data-document-diagram-following]):has(+ [data-document-move-row][data-document-placeholder-container]) {
    margin-block-end: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired']
    :is([data-document-comment-before], [data-document-diagram-following]) + [data-document-move-row][data-document-placeholder-container] {
    margin-block-end: 1em;
  }
}

@media (min-width: 821px) {
  /* Focus remains functional without drawing frames around paper controls. */
  .opening-map-repertoire-document {
    --document-focus-outline: none;
  }
  :where(.opening-map-repertoire-document:focus, .opening-map-repertoire-document :focus) {
    outline: var(--document-focus-outline);
  }
  .opening-map-repertoire-document .cm-chessboard:focus,
  .opening-map-repertoire-document :is(.opening-map-explorer-database-action, .opening-map-explorer-database-score, .opening-map-settings-select, .opening-map-explorer-move-label):focus-visible,
  .opening-map-repertoire-document :is(.opening-map-explorer-strip, .opening-map-explorer-tabbed, .opening-map-document-engine) .opening-map-position-footer-row .opening-map-analysis-pane-stockfish > .opening-map-card-engine-disclosure:focus-visible {
    outline: var(--document-focus-outline);
  }

  .opening-map-repertoire-document-editor[data-document-page-layout='pageless']:is([data-document-ending-diagram], [data-document-ending-section]) {
    padding-bottom: 1.3em;
  }
  .opening-map-repertoire-document-content {
    --document-scroll-inset-top: 64px;
    --document-scroll-inset-bottom: 24px;
    display: flex;
    flex-direction: column;
    height: 100dvh;
    padding-block: 0;
  }
  .opening-map-document-toolbar { flex: none; }
  .opening-map-document-pages {
    flex: 1;
    min-height: 0;
    box-sizing: border-box;
    /* The initial gutter scrolls away; pages pass behind the floating toolbar. */
    padding-block: var(--document-scroll-inset-top) var(--document-scroll-inset-bottom);
    scroll-padding-block: var(--document-scroll-inset-top) var(--document-scroll-inset-bottom);
    overflow: auto;
    overscroll-behavior: contain;
  }
}

@media (min-width: 821px), print {
  .opening-map-repertoire-document-editor[data-document-columns] {
    --document-side-diagram-gap: 0.75em;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-trailing-caret] {
    clear: both;
    min-height: 1.3em;
  }

  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:has(.opening-map-document-game-start) {
    clear: both;
  }
  /* End the previous section's floats independently of the next section's
     margins, which the browser can discard at page and column boundaries. */
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-flow-boundary] {
    display: block;
    clear: both;
    height: 0;
    line-height: 0;
  }
  .opening-map-repertoire-document-editor:is([data-document-atom-editing], [data-document-paragraph-editing]) [data-document-flow-boundary] {
    display: none;
  }

  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram {
    clear: both;
    break-inside: avoid;
  }
  /* Keep a deferred float with its prose, without moving a whole main line.
     Paired move rows retain their own column-breaking boundaries. */
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:has(> .opening-map-document-diagram:is([data-diagram-placement='left'], [data-diagram-placement='right'])):not(:has([data-document-move-row])) {
    break-inside: avoid;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram:is([data-diagram-placement='left'], [data-diagram-placement='right']) {
    margin-block: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram:is([data-diagram-placement='left'], [data-diagram-placement='right'])[data-document-diagram-before-side] {
    margin-block-end: var(--document-side-diagram-gap);
  }
  /* The next diagram-led paragraph clears together with its accompanying text. */
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:has(> [data-document-diagram-flow~='start']) {
    clear: both;
  }
  .opening-map-repertoire-document-editor[data-document-columns] :is([data-document-caret-break='diagram-flow'], [data-document-caret-break='comment-flow']) {
    display: block;
    clear: both;
    height: 0;
    line-height: 0;
  }
  .opening-map-repertoire-document-editor[data-document-atom-editing] :is([data-document-caret-break='diagram-flow'], [data-document-caret-break='comment-flow']) {
    display: none;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='flowing'] [data-document-line='body']:has(> [data-document-diagram-flow~='start']) {
    padding-block-start: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-diagram-following] {
    margin-block-end: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram[data-document-diagram-flow] {
    margin-block-start: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:not([data-document-heading-level]):not(:empty):has(> .opening-map-document-diagram[data-document-diagram-flow~='end']) {
    margin-block-end: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-line='body']:has(> [data-document-diagram-flow~='start'][data-document-diagram-flow~='end']) {
    min-height: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-diagram-adjacent] {
    margin-block-start: 0;
  }

  /* Consecutive illustrated positions can share one continuous variation.
     The authored paragraph boxes stay in place for native editing. */
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram-run {
    display: block;
    clear: both;
    break-inside: avoid;
    margin: var(--document-side-diagram-gap) 0 0;
    padding: 0;
  }
  .opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-diagram-run {
    display: inline;
  }
  .opening-map-repertoire-document-editor[data-document-columns]
    :is([data-document-line='body'], .opening-map-repertoire-document-variation):is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after]) {
    clear: none;
    min-height: 0;
    margin-block: 0;
    padding-block: 0;
    break-inside: auto;
  }
  .opening-map-repertoire-document-editor[data-document-columns]
    .opening-map-repertoire-document-variation:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after]) {
    display: inline;
  }
  /* Keep authored paragraph seams continuous without an inline paragraph box
     that lets text flow above its board after the clearing boundary. */
  .opening-map-repertoire-document-editor[data-document-columns]
    [data-document-line='body']:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after]) {
    display: contents;
  }
  /* A leading illustrated run owns its clearing and spacing boundary. Its
     variation ancestors must not add an empty line before that boundary. */
  .opening-map-repertoire-document-editor[data-document-columns]:not([data-document-atom-editing]):not([data-document-paragraph-editing])
    .opening-map-repertoire-document-variation[data-document-diagram-run-start]:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after]) {
    display: contents;
  }
  .opening-map-repertoire-document-editor[data-document-columns]
    .opening-map-repertoire-document-variation[data-document-diagram-continuation-after] {
    margin-inline-start: 0;
    padding-inline-start: 0;
    border-inline-start: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns]
    [data-document-line='body'][data-document-diagram-continuation-before]:not([data-document-diagram-continuation-after]):not([data-document-diagram-run-start])::before,
  .opening-map-repertoire-document-editor[data-document-columns]
    [data-document-line='body'][data-document-diagram-continuation-after]:not([data-document-diagram-continuation-before])::after {
    content: '';
    display: block;
    clear: both;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-paragraph-editing]
    [data-document-line='body']:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after]) {
    display: block;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-paragraph-editing]
    [data-document-line='body']:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after])::before,
  .opening-map-repertoire-document-editor[data-document-columns][data-document-paragraph-editing]
    [data-document-line='body']:is([data-document-diagram-continuation-before], [data-document-diagram-continuation-after])::after {
    content: none;
  }

  /* Space the complete commentary section, including its floated board. */
  .opening-map-repertoire-document-editor[data-document-columns] [data-document-comment-resume] {
    clear: both;
    padding-block-start: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-repertoire-document-variation[data-document-comment-resume] {
    margin-block-start: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-comment-before] {
    margin-block-end: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-comment-after] {
    clear: both;
    padding-block-start: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-line='body']:not([data-document-heading-level]):not(:empty)[data-document-comment-leading] {
    margin-block-end: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-line='body']:not([data-document-heading-level]):not(:empty)[data-document-comment-trailing] {
    margin-block-end: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-comment-first] {
    margin-block-start: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-comment-last] {
    margin-block-end: 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-line='body']:not([data-document-heading-level]):not(:empty)[data-document-comment-ending] {
    margin-block-end: 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns][data-document-move-layout='paired'] [data-document-comment-ending]::after {
    content: '';
    display: block;
    clear: both;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram[data-diagram-placement='left'] {
    float: left;
    margin-inline: 0 1em;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram[data-diagram-placement='right'] {
    float: right;
    margin-inline: 1em 0;
  }
  .opening-map-repertoire-document-editor[data-document-columns] .opening-map-document-diagram:is([data-diagram-placement='left'], [data-diagram-placement='right']) {
    width: min(48%, 208px);
  }

  .opening-map-repertoire-document-editor[data-document-columns]::after {
    content: '';
    display: block;
    clear: both;
  }

  /* Paragraph and passage end spacing separates following content. At the
     document end it can otherwise push the float-clearer into an empty page.
     Authored empty paragraphs retain their own line height. */
  .opening-map-repertoire-document-editor[data-document-columns] > [data-document-line]:last-child {
    margin-block-end: 0 !important;
  }

  /* Native atom replacement needs inline flow while its edit boundaries exist. */
  .opening-map-repertoire-document-editor[data-document-atom-editing] .opening-map-document-diagram[data-diagram-placement] {
    float: none;
    clear: none;
  }
}

.opening-map-document-pages { position: relative; min-width: 0; }
.opening-map-document-page-canvas { position: relative; margin-inline: auto; }
.opening-map-document-page-paper, .opening-map-document-page-numbers { pointer-events: none; }

@media (min-width: 821px) {
  .opening-map-document-pages[data-document-paged='true'] .opening-map-document-page-canvas {
    padding-block: var(--document-page-margin);
    box-sizing: border-box;
    display: flow-root;
  }

  .opening-map-document-page-paper { position: absolute; inset: 0; }
  .opening-map-document-page-sheet {
    position: absolute;
    left: 0;
    width: var(--document-page-width);
    height: var(--document-page-height);
    box-sizing: border-box;
    border: 1px solid var(--map-border);
    background: var(--map-bg);
  }
  .opening-map-document-page-numbers { position: absolute; inset: var(--document-scroll-inset-top) 0 0; }
  .opening-map-document-page-number {
    position: absolute;
    left: 0;
    right: 0;
    text-align: center;
    color: var(--map-muted);
    font: 400 15px/18px var(--map-ui-font);
  }
  .opening-map-document-pages[data-document-paged='true'] .opening-map-repertoire-document-editor {
    position: relative;
    margin-inline: var(--document-page-margin);
    padding: 0;
    min-height: var(--document-content-height);
    column-count: var(--document-columns);
    column-gap: var(--document-column-gap);
    column-height: var(--document-content-height);
    column-wrap: wrap;
    column-fill: auto;
    row-gap: var(--document-row-gap);
  }
  .opening-map-document-pages .opening-map-document-diagram-controls {
    zoom: calc(1 / var(--document-page-scale));
  }
}

@media print {
  html:has(.opening-map-repertoire-document[open]),
  body:has(.opening-map-repertoire-document[open]) {
    height: auto !important;
    overflow: visible !important;
    background: white;
  }
  body:has(.opening-map-repertoire-document[open]) > :not(.opening-map-repertoire-document[open]) { display: none !important; }
  .opening-map-repertoire-document[open] {
    position: static;
    display: block;
    width: auto;
    height: auto;
    overflow: visible;
    color: black;
    background: white;
    page: notebook;
    --map-text: black;
    --map-muted: #444;
    --map-border: #999;
  }
  .opening-map-repertoire-document::backdrop { display: none; }
  .opening-map-document-toolbar,
  .opening-map-repertoire-document-companion,
  .opening-map-repertoire-document-delete-confirmation,
  .opening-map-repertoire-document-error,
  .opening-map-document-page-paper,
  .opening-map-document-page-numbers,
  .opening-map-document-diagram-controls,
  .opening-map-document-annotation-panel,
  .opening-map-repertoire-document-move-tray,
  .opening-map-document-move-placeholder,
  [data-document-placeholder-container] { display: none !important; }
  .opening-map-document-move-row:has(> [data-document-placeholder-container][data-document-move-cell='black'])::after {
    content: '...';
    grid-column: 3;
  }
  .opening-map-repertoire-document-workspace,
  .opening-map-repertoire-document-layout,
  .opening-map-repertoire-document-content[data-document-columns],
  .opening-map-document-pages,
  .opening-map-document-page-canvas {
    display: block;
    position: static;
    width: auto !important;
    max-width: none;
    height: auto;
    min-height: 0 !important;
    margin: 0;
    padding: 0 !important;
    overflow: visible;
    zoom: 1 !important;
    background: white;
  }
  .opening-map-document-page-canvas .opening-map-repertoire-document-editor[data-document-columns] {
    position: static;
    margin: 0;
    padding: 0;
    min-height: 0;
    column-count: var(--document-columns);
    column-gap: 32.4px;
    column-height: auto;
    column-wrap: nowrap;
    column-fill: auto;
    row-gap: 0;
  }
  .opening-map-repertoire-document-editor [data-document-title-placeholder]::before { content: none; }
  .opening-map-repertoire-document-move[aria-current='step'] { color: inherit; background: transparent; }
  .opening-map-repertoire-document-move[data-document-diagram-linked] { color: inherit; background: transparent; outline: none; }
  .opening-map-document-diagram.is-selected .opening-map-document-diagram-board { outline: none; }
}

.opening-map-repertoire-document-companion-content {
  position: sticky;
  top: 0;
  display: grid;
  gap: 0;
  min-width: 0;
}

.opening-map-document-sidebar { min-width: 0; }

.opening-map-document-flip-board {
  position: absolute;
  top: 14px;
  right: 24px;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-muted);
  cursor: pointer;
}

.opening-map-document-flip-board:hover { background: var(--map-control-hover); }
.opening-map-document-flip-board:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-toolbar-icon img { display: block; }
.opening-map-document-toolbar-icon img,
.opening-map-document-flip-board img,
.opening-map-document-sidebar-tab img { filter: var(--map-icon-filter); }
.opening-map-document-toolbar button:hover img,
.opening-map-document-flip-board:hover img,
.opening-map-document-sidebar-tab:hover img { filter: var(--map-icon-hover-filter); }

.opening-map-document-sidebar-tabs {
  display: flex;
  gap: 20px;
  margin: 14px 24px 0;
  border-bottom: 1px solid var(--map-border);
}

@media (min-width: 821px) {
  .opening-map-document-sidebar-tabs { flex-wrap: nowrap; column-gap: 16px; row-gap: 0; }
}

@media screen and (min-width: 821px) {
  .opening-map-repertoire-document-companion-content {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    min-height: 0;
    padding-top: 65px;
    box-sizing: border-box;
    overflow: hidden;
  }

  .opening-map-repertoire-document-companion-content::before {
    content: '';
    position: absolute;
    top: 50px;
    inset-inline: 24px;
    border-top: 1px solid var(--map-border);
    pointer-events: none;
  }

  .opening-map-document-sidebar-actions {
    position: absolute;
    top: 14px;
    left: 24px;
    right: 104px;
    display: flex;
    align-items: center;
    gap: 4px;
    height: 32px;
  }

  .opening-map-document-sidebar-actions > :is(button, a),
  .opening-map-document-sidebar-actions .opening-map-document-study-shortcut .opening-map-document-study-button {
    display: inline-flex;
    flex: 0 0 32px;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    width: 32px;
    height: 32px;
    min-height: 32px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--map-muted);
    font: inherit;
    text-decoration: none;
    cursor: pointer;
  }

  .opening-map-document-sidebar-actions > .opening-map-document-study-shortcut {
    order: 0;
    height: 32px;
  }

  .opening-map-document-sidebar-actions img {
    display: block;
    filter: var(--map-icon-filter);
  }

  .opening-map-document-sidebar-actions :is(button:enabled, a):hover {
    color: var(--map-text);
    background: var(--map-control-hover);
  }

  .opening-map-document-sidebar-actions :is(button:enabled, a):hover img {
    filter: var(--map-icon-hover-filter);
  }

  .opening-map-document-sidebar-actions button:disabled {
    opacity: .45;
    cursor: default;
  }

  .opening-map-document-shared-board {
    flex: none;
    align-self: center;
    width: calc(100% - 48px);
    /* Reserve the tab strip and useful content beneath a square board. */
    max-width: max(160px, calc(100dvh - 285px));
  }

  .opening-map-document-shared-board > .opening-map-document-game-board {
    width: 100%;
    margin: 0;
  }

  .opening-map-repertoire-document-companion-content > .opening-map-document-sidebar {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow: hidden;
  }

  .opening-map-document-sidebar > .opening-map-document-sidebar-tabs {
    flex: none;
    padding-inline-end: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .opening-map-document-sidebar > .opening-map-document-sidebar-auxiliary-header {
    flex: none;
  }

  .opening-map-document-sidebar > .opening-map-document-sidebar-panel {
    flex: 1;
    min-height: 0;
    max-height: none;
    overflow: auto;
    overscroll-behavior: contain;
  }
}

.opening-map-document-sidebar-auxiliary-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 12px 24px 0;
}
.opening-map-document-sidebar-auxiliary-header[hidden] { display: none; }
.opening-map-document-sidebar-auxiliary-title {
  margin: 0;
  font: 500 15px/1.5 var(--map-ui-font);
}
.opening-map-document-sidebar-auxiliary-close,
.opening-map-document-edit-position {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-muted);
  cursor: pointer;
}
.opening-map-document-sidebar-auxiliary-close img,
.opening-map-document-edit-position img { display: block; filter: var(--map-icon-filter); }
.opening-map-document-sidebar-auxiliary-close:hover,
.opening-map-document-edit-position:enabled:hover { background: var(--map-control-hover); }
.opening-map-document-sidebar-auxiliary-close:focus-visible,
.opening-map-document-edit-position:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-edit-position { position: absolute; top: 14px; right: 60px; }
.opening-map-document-edit-position[hidden] { display: none; }
.opening-map-document-edit-position:disabled { opacity: .45; cursor: default; }

.opening-map-document-sidebar-tab {
  min-height: 36px;
  padding: 0 0 7px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--map-muted);
  font: 400 15px/1.5 var(--map-ui-font);
  cursor: pointer;
}

#notebook-sidebar-edit-tab { min-width: 32px; }
.opening-map-document-sidebar-tab img { display: block; margin-inline: auto; }
.opening-map-document-sidebar-tab:disabled { opacity: 0.45; cursor: default; }
.opening-map-document-sidebar-tab:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 2px; }
.opening-map-document-sidebar-tab:hover { color: var(--map-text); }
.opening-map-document-sidebar-tab[aria-selected='true'] {
  border-bottom-color: var(--map-accent);
  color: var(--map-text);
}

.opening-map-document-position-panel[hidden],
.opening-map-document-outline-panel[hidden],
.opening-map-document-papers-panel[hidden],
.opening-map-document-settings-panel[hidden],
.opening-map-document-edit-panel[hidden] { display: none; }

.opening-map-document-outline-panel,
.opening-map-document-papers-panel,
.opening-map-document-settings-panel {
  max-height: calc(100dvh - 51px);
  overflow: auto;
  padding: 14px 24px 24px;
  box-sizing: border-box;
}

.opening-map-document-outline-heading {
  display: block;
  width: 100%;
  min-height: 36px;
  padding: 7px 8px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--map-text);
  font: 400 15px/1.5 var(--map-ui-font);
  text-align: left;
  overflow-wrap: anywhere;
  cursor: pointer;
}
.opening-map-document-outline-heading:enabled:hover { background: var(--map-control-hover); }
.opening-map-document-outline-heading:disabled { opacity: 0.45; cursor: default; }
.opening-map-document-outline-heading[data-depth='1'] { padding-left: 24px; }
.opening-map-document-outline-heading[data-depth='2'] { padding-left: 40px; }
.opening-map-document-outline-empty { margin: 7px 8px; color: var(--map-muted); }

.opening-map-repertoire-document-diagram {
  width: calc(100% - 48px);
  margin: 14px 24px;
  aspect-ratio: 1;
  overflow: hidden;
  box-sizing: border-box;
}

.opening-map-repertoire-document-diagram .cm-chessboard {
  width: 100%;
  height: 100%;
}

.opening-map-document-engine.opening-map-position-footer {
  width: auto;
  min-width: 0;
  margin: 0 24px 8px;
  border: 0;
  background: transparent;
  font: 400 15px/1.5 var(--map-ui-font);
}

.opening-map-document-engine .opening-map-position-footer-row {
  min-height: 40px;
  padding: 0;
}

@media (min-width: 821px) {
  .opening-map-document-position-board > .opening-map-document-game-board {
    margin-bottom: 0;
  }

  .opening-map-document-engine.opening-map-position-footer {
    margin-bottom: 0;
  }
}

.opening-map-document-engine .opening-map-analysis-pane-stockfish-drawer {
  padding: 0;
  background: transparent;
}

.opening-map-document-engine .opening-map-analysis-pane-stockfish-drawer[data-card-engine-drawer-state='expanded'] {
  padding: 0 0 12px;
}

.opening-map-document-engine .opening-map-analysis-pane-stockfish-drawer .inspector-review-engine-lines {
  min-height: 0;
  max-height: none;
}

.opening-map-document-engine .opening-map-engine-move:focus-visible {
  box-shadow: none;
  outline: var(--document-focus-outline, 1px solid var(--map-accent));
  outline-offset: -1px;
}

.opening-map-document-engine-error {
  margin: 0 24px 12px;
  color: var(--map-bad);
  font: 400 15px/1.5 var(--map-ui-font);
}

.opening-map-document-move-stats {
  margin: 0 24px;
  min-width: 0;
  border-top: 1px solid var(--map-border);
  color: var(--map-muted);
  font: 400 15px/1.4 var(--map-ui-font);
}

.opening-map-document-insights {
  margin-inline: 24px;
  margin-bottom: 24px;
  min-width: 0;
}

.opening-map-document-move-stats-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) minmax(0, 1fr);
  min-height: 40px;
  border-bottom: 1px solid var(--map-border);
}

.opening-map-document-move-stats-source {
  display: flex;
  align-items: center;
  padding-right: 8px;
}

.opening-map-document-move-stats .opening-map-card-branch-line-metric {
  gap: 6px;
  font-size: 15px;
  cursor: help;
}

.opening-map-document-annotation-panel {
  position: fixed;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 2px;
  width: 264px;
  margin: 0;
  padding: 8px;
  overflow: auto;
  box-sizing: border-box;
  border: 1px solid var(--map-border-strong);
  background: var(--map-panel-solid);
  color: var(--map-text);
}

.opening-map-document-annotation-panel[hidden] { display: none; }

.opening-map-document-annotation-group {
  display: contents;
}

.opening-map-document-annotation {
  min-width: 0;
  min-height: 32px;
  padding: 2px 4px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  color: var(--map-text);
  font: 500 18px/1.4 var(--map-ui-font);
  cursor: pointer;
}

.opening-map-document-annotation:enabled:hover { background: var(--map-control-hover); }
.opening-map-document-annotation[aria-pressed='true'] {
  border-color: var(--map-border-strong);
  background: var(--map-control-hover);
}
.opening-map-document-annotation:focus-visible { outline: var(--document-focus-outline, 2px solid var(--map-accent)); outline-offset: 1px; }
.opening-map-document-annotation:disabled { opacity: 0.45; cursor: default; }
.opening-map-document-move-annotations { font-family: var(--map-ui-font); }

.opening-map-document-move-stats .opening-map-card-branch-line-metric-icon {
  width: 16px;
  height: 16px;
}

.opening-map-document-move-stats [data-metric='score'] {
  grid-column: 3;
}

.opening-map-document-move-stats [tabindex]:focus-visible {
  outline: var(--document-focus-outline, 2px solid var(--map-accent));
  outline-offset: -2px;
}

.opening-map-repertoire-document-sources:empty { display: none; }

.opening-map-repertoire-document-sources {
  display: grid;
  gap: 4px;
  padding: 12px 24px 24px;
  font: 400 15px/1.4 var(--map-ui-font);
}

.opening-map-repertoire-document-continuations-error {
  margin: 0;
  padding: 12px 24px;
  color: var(--map-bad);
  font: 400 15px/1.5 var(--map-ui-font);
}

.opening-map-repertoire-document-error {
  flex: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--map-border);
  background: var(--map-panel-solid);
  color: var(--map-bad);
}

.opening-map-repertoire-document-error-message {
  flex: 1 1 320px;
}

.opening-map-repertoire-document [hidden] {
  display: none;
}

/* Game roots remain structural atoms while their controls are editor-only. */
.opening-map-document-game-start {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 28px;
  margin-inline: -8px 4px;
  vertical-align: middle;
  user-select: none;
}

.opening-map-document-game-start button {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--map-muted);
  font: 400 15px/1 var(--map-ui-font);
  cursor: pointer;
}

.opening-map-document-game-point > span {
  width: 7px;
  height: 7px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.opening-map-document-game-start[aria-current] .opening-map-document-game-point,
.opening-map-document-game-start button:hover {
  color: var(--map-accent);
  background: var(--map-control-hover);
}

.opening-map-document-game-start button:focus-visible {
  outline: var(--document-focus-outline, 1px solid var(--map-accent));
  outline-offset: 1px;
}

@media (min-width: 821px) {
  .opening-map-repertoire-document-editor:not([data-document-atom-editing])
    .opening-map-document-move-row > .opening-map-document-game-start {
    position: absolute;
    inset-inline-end: 100%;
    top: 0;
    width: 28px;
    height: 100%;
    margin: 0;
  }

}

[contenteditable='false'] > [data-document-line] .opening-map-document-game-start {
  display: none;
}

@media print {
  .opening-map-document-game-start { display: none; }
}

.opening-map-document-mobile-header { display: none; }

@media screen and (max-width: 820px) {
  .opening-map-repertoire-document {
    --document-mobile-toolbar-start: 54px;
  }
  .opening-map-repertoire-document[data-editable='false'] {
    --document-mobile-toolbar-start: 12px;
  }
  .opening-map-document-mobile-header:not([hidden]) {
    display: flex;
    flex: none;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    min-height: 64px;
    box-sizing: border-box;
    padding: 14px 8px 14px 64px;
    border-bottom: 1px solid var(--map-border);
    background: var(--map-panel-solid);
  }

  .opening-map-document-mobile-header button {
    min-height: 36px;
    padding: 7px 12px;
    border: 1px solid var(--map-border);
    border-radius: 0;
    background: transparent;
    color: var(--map-text);
    font: 400 15px/20px var(--map-ui-font);
    cursor: pointer;
  }

  .opening-map-document-mobile-header button:enabled:hover {
    border-color: var(--map-border-strong);
    background: var(--map-control-hover);
  }

  .opening-map-document-mobile-header .opening-map-document-mobile-open,
  .opening-map-document-mobile-header .opening-map-document-mobile-back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    padding: 0;
    border: 0;
  }

  .opening-map-document-mobile-header .opening-map-document-mobile-open[hidden],
  .opening-map-document-mobile-header .opening-map-document-mobile-back[hidden] { display: none; }
  .opening-map-document-mobile-header img { filter: var(--map-icon-filter); }

  .opening-map-repertoire-document-workspace {
    overflow: hidden;
  }

  .opening-map-repertoire-document-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr);
    width: 100%;
    height: 100%;
    min-height: 0;
  }

  /* Both surfaces keep their measured size and scroll state while inactive. */
  .opening-map-repertoire-document-content,
  .opening-map-repertoire-document-companion {
    grid-area: 1 / 1 / 2 / 2;
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
  }

  .opening-map-repertoire-document[data-mobile-panel='sidebar']:not([data-mobile-paper-editing]) .opening-map-repertoire-document-content,
  .opening-map-repertoire-document[data-mobile-panel='paper'] .opening-map-repertoire-document-companion {
    visibility: hidden;
    pointer-events: none;
  }

  .opening-map-repertoire-document-content {
    display: flex;
    flex-direction: column;
    max-width: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
  }

  .opening-map-document-toolbar {
    --document-toolbar-section-gap: 4px;
    position: fixed;
    top: 14px;
    left: var(--document-mobile-toolbar-start);
    right: 46px;
    flex-wrap: nowrap;
    justify-content: safe center;
    gap: 0;
    width: auto;
    height: 36px;
    min-height: 36px;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border: 0;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
  }

  .opening-map-document-toolbar > *,
  .opening-map-document-paper-actions > * {
    flex-shrink: 0;
  }

  .opening-map-document-toolbar button:focus-visible { outline-offset: -2px; }

  /* Popovers stay outside the scrolling action row without moving their DOM. */
  .opening-map-document-format-menu {
    position: fixed;
    top: 58px;
    left: var(--document-mobile-toolbar-start);
    max-height: calc(100dvh - 70px);
    overflow-y: auto;
  }
  .opening-map-document-layout-popover,
  .opening-map-document-zoom-popover {
    position: fixed;
    inset: 58px 12px auto auto;
    max-width: calc(100vw - 24px);
    max-height: calc(100dvh - 70px);
    overflow-y: auto;
  }

  .opening-map-document-toolbar .opening-map-document-insert-export-pdf {
    width: 36px;
    padding: 0;
  }

  .opening-map-document-insert-export-pdf > span:not(.opening-map-document-toolbar-icon) { display: none; }
  .opening-map-document-toolbar .opening-map-document-read-button { width: 40px; padding: 0; }

  .opening-map-document-pages {
    flex: 1;
    min-height: 0;
    padding: 16px 12px 24px;
    box-sizing: border-box;
    overflow: auto;
    overscroll-behavior: contain;
  }

  .opening-map-repertoire-document-delete-confirmation {
    left: 12px;
    max-width: calc(100% - 24px);
  }

  .opening-map-repertoire-document-companion {
    border: 0;
    background: var(--map-panel-solid);
    overflow: auto;
    overscroll-behavior: contain;
  }

  .opening-map-repertoire-document-companion-content {
    position: relative;
    top: auto;
    min-height: 100%;
  }

  .opening-map-document-sidebar-tabs {
    position: fixed;
    z-index: 3;
    top: 14px;
    left: var(--document-mobile-toolbar-start);
    right: 46px;
    height: 36px;
    flex-wrap: nowrap;
    justify-content: safe center;
    gap: 4px;
    margin: 0;
    padding: 0;
    border: 0;
    overflow-x: auto;
    scrollbar-width: none;
    background: var(--map-panel-solid);
  }

  .opening-map-document-sidebar { display: flow-root; }
  .opening-map-document-sidebar-tab { flex: 0 0 auto; padding-bottom: 0; }
  .opening-map-document-sidebar-tab:focus-visible { outline-offset: -2px; }

  .opening-map-document-engine .opening-map-position-footer-row,
  .opening-map-document-game-setup h3 {
    padding-inline-end: 44px;
  }

  .opening-map-document-flip-board {
    top: 0;
    /* The square board and its two 12px margins occupy the sidebar width. */
    margin-top: calc(100% + 6px);
    right: 12px;
  }

  .opening-map-document-outline-panel,
  .opening-map-document-papers-panel,
  .opening-map-document-settings-panel {
    max-height: none;
    overflow: visible;
    padding: 16px 12px 24px;
  }

  .opening-map-repertoire-document .opening-map-document-game-board {
    margin: 12px;
  }

  .opening-map-document-engine.opening-map-position-footer,
  .opening-map-document-engine-error,
  .opening-map-document-move-stats,
  .opening-map-document-insights {
    margin-inline: 12px;
  }

  .opening-map-repertoire-document .opening-map-document-game-setup,
  .opening-map-repertoire-document .opening-map-document-recall-controls,
  .opening-map-repertoire-document-sources,
  .opening-map-repertoire-document-continuations-error {
    padding-inline: 12px;
  }
}