.app {
  display: grid;
  grid-template-rows: var(--titlebar-h) auto 1fr;
  height: 100dvh;
  background: var(--bg-chrome);
}

/* ---------- title bar ---------- */
.titlebar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  padding: 0 10px 0 8px;
  min-width: 0;
  user-select: none;
}
.titlebar-start,
.titlebar-end {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
}
.titlebar-end {
  justify-content: flex-end;
  gap: 6px;
}
.app-mark {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 8px;
  padding: 0 4px;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
}
.app-mark img {
  width: 20px;
  height: 20px;
}
.titlebar .icon-btn {
  width: 28px;
  height: 28px;
}
.titlebar-title {
  min-width: 0;
  max-width: 50vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
  font-size: 13px;
  color: var(--text-2);
}
.sync-btn {
  width: auto !important;
  padding: 0 6px !important;
  gap: 4px;
  display: inline-flex !important;
  align-items: center;
}
.sync-btn[data-status="error"] {
  color: var(--danger);
}
.sync-btn[data-status="saving"] .icon,
.sync-btn[data-status="pending"] .icon {
  opacity: 0.7;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--text);
}
.share-btn:hover {
  background: var(--bg-hover);
}
.mobile-only {
  display: none !important;
}

/* ---------- ribbon ---------- */
.ribbon {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 0 8px 6px;
}
.ribbon-tabs-row {
  display: flex;
  align-items: center;
  gap: 4px;
  height: var(--tabs-h);
  padding: 0 4px;
  min-width: 0;
}
.ribbon-tabs {
  display: flex;
  align-items: stretch;
  height: 100%;
  gap: 2px;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.ribbon-tabs::-webkit-scrollbar {
  display: none;
}
.ribbon-tab {
  position: relative;
  padding: 0 10px;
  border: 0;
  border-radius: var(--radius-s);
  background: transparent;
  color: var(--text-2);
  font-size: 13px;
  white-space: nowrap;
}
.ribbon-tab:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.ribbon-tab[aria-selected="true"] {
  color: var(--accent-text);
  font-weight: 600;
}
.ribbon-tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 3px;
  border-radius: 2px;
  background: var(--accent);
}
.ribbon-tab.contextual {
  color: var(--accent-text);
  /* Keeps the tint below from painting behind the chrome's background. */
  isolation: isolate;
}
.ribbon-tab.contextual::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  top: 3px;
  bottom: 3px;
  border-radius: var(--radius-s);
  background: var(--accent-soft);
  z-index: -1;
}
.tell-me {
  position: relative;
  display: flex;
  align-items: center;
  margin-left: 6px;
}
.tell-me .icon {
  position: absolute;
  left: 8px;
  color: var(--text-3);
  pointer-events: none;
}
.tell-me input {
  width: 160px;
  height: 24px;
  padding: 0 8px 0 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--text);
  font-size: 13px;
}
.tell-me input::placeholder {
  color: var(--text-2);
}
.tell-me input:hover {
  background: var(--bg-hover);
}
.tell-me input:focus {
  outline: none;
  width: 240px;
  background: var(--bg-input);
  border-color: var(--focus);
}
.ribbon-spacer {
  flex: 1;
}
.ribbon-collapse {
  width: 26px !important;
  height: 24px !important;
}
/* Expanded is this button's resting state, not an open menu. */
.ribbon-collapse[aria-expanded="true"] {
  background: transparent;
  color: var(--text-2);
}
.ribbon-collapse:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.ribbon-collapse:active {
  background: var(--bg-active);
}

.ribbon-panel {
  display: flex;
  align-items: stretch;
  /* One height for every tab so the page never jumps when switching. */
  height: 78px;
  padding: 4px 6px;
  border: 1px solid var(--card-line);
  border-radius: var(--radius-l);
  /*
   * Edge shadows show when commands are scrolled out of view. The covers
   * scroll with the content and hide each shadow once that edge is reached.
   */
  background:
    linear-gradient(to right, var(--bg-card) 50%, transparent) left / 32px 100% no-repeat local,
    linear-gradient(to left, var(--bg-card) 50%, transparent) right / 32px 100% no-repeat local,
    radial-gradient(farthest-side at 0 50%, var(--scroll-shadow), transparent) left / 12px 100% no-repeat scroll,
    radial-gradient(farthest-side at 100% 50%, var(--scroll-shadow), transparent) right / 12px 100% no-repeat scroll,
    var(--bg-card);
  overflow: hidden;
}
.ribbon[data-collapsed="true"] .ribbon-panel {
  display: none;
}
.ribbon[data-collapsed="true"].peek .ribbon-panel {
  display: flex;
  position: absolute;
  z-index: 50;
  left: 8px;
  right: 8px;
  top: calc(var(--titlebar-h) + var(--tabs-h));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}
.ribbon-toolbar {
  display: flex;
  align-items: stretch;
  gap: 0;
  min-width: 0;
  flex: 1;
}
.rb-group {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 0 6px;
  position: relative;
  flex: none;
}
.rb-group + .rb-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}
.rb-group:first-child {
  padding-left: 0;
}
.rb-stack {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}
.rb-row {
  display: flex;
  align-items: center;
  gap: 1px;
}
@media (min-width: 761px) {
  .rb-stack.dense {
    gap: 1px;
  }
  .rb-stack.dense .rb-btn {
    height: 22px;
  }
}
.rb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 28px;
  height: 28px;
  padding: 0 5px;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  background: transparent;
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
}
.rb-btn .icon:not(.ico) {
  color: var(--text-2);
}
.rb-btn:hover {
  background: var(--bg-hover);
}
.rb-btn:active,
.rb-btn[aria-pressed="true"],
.rb-btn[aria-expanded="true"] {
  background: var(--bg-active);
}
.rb-btn[aria-pressed="true"] {
  border-color: var(--line-strong);
}
.rb-btn[aria-pressed="true"] .icon:not(.ico) {
  color: var(--accent-text);
}
.rb-btn:disabled,
.rb-btn[aria-disabled="true"] {
  color: var(--text-disabled);
  pointer-events: none;
}
.rb-btn:disabled .icon:not(.ico),
.rb-btn[aria-disabled="true"] .icon:not(.ico) {
  color: var(--text-disabled);
}
.rb-btn.big {
  flex-direction: column;
  justify-content: flex-start;
  gap: 3px;
  min-width: 44px;
  height: 64px;
  padding: 6px 4px 2px;
  font-size: 11px;
  line-height: 1.15;
  text-align: center;
  white-space: normal;
}
.rb-btn.big .icon {
  width: 26px;
  height: 26px;
}
.rb-btn.big .rb-label {
  max-width: 64px;
}
.rb-btn .rb-caret {
  margin-left: -2px;
  color: var(--text-3);
}
.rb-btn.big .rb-caret {
  margin: -2px 0 0;
}
.rb-split {
  display: inline-flex;
  align-items: stretch;
  border-radius: var(--radius-s);
}
.rb-split > .rb-btn:first-child {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  padding-right: 3px;
}
.rb-split > .rb-btn + .rb-btn {
  min-width: 14px;
  padding: 0 1px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}
.rb-split:hover > .rb-btn {
  border-color: var(--line);
}
.rb-split.big {
  flex-direction: column;
}
/* The halves split where a big button's label starts, so labels line up. */
.rb-split.big > .rb-btn:first-child {
  height: 35px;
  border-radius: var(--radius-s) var(--radius-s) 0 0;
  padding: 6px 4px 0;
}
.rb-split.big > .rb-btn + .rb-btn {
  align-items: flex-start;
  height: 29px;
  min-width: 44px;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  font-size: 11px;
  line-height: 1.15;
  gap: 0;
}
.rb-color-bar {
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 4px;
  height: 3px;
  border-radius: 1px;
  background: var(--bar);
}
.rb-btn.colored {
  position: relative;
}
.rb-combo {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  background: var(--bg-input);
}
.rb-combo input {
  width: 100%;
  height: 100%;
  min-width: 0;
  padding: 0 4px 0 7px;
  border: 0;
  background: transparent;
  font-size: 12px;
}
.rb-combo input:focus {
  outline: none;
}
.rb-combo:focus-within {
  border-color: var(--focus);
}
.rb-combo button {
  display: grid;
  place-items: center;
  width: 18px;
  height: 100%;
  padding: 0;
  border: 0;
  border-left: 1px solid transparent;
  background: transparent;
  color: var(--text-3);
}
.rb-combo button:hover {
  background: var(--bg-hover);
}

/* In-ribbon galleries (styles, tags, pens, shapes) */
.rb-gallery {
  display: flex;
  align-items: stretch;
  margin: 2px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--bg-input);
  overflow: hidden;
}
.rb-gallery-items {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(var(--rows, 1), 1fr);
  gap: 1px;
  padding: 2px;
  overflow: hidden;
}
.rb-gallery-item {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  padding: 2px 8px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  color: var(--text);
  white-space: nowrap;
  text-align: left;
}
.rb-gallery-item:hover {
  background: var(--bg-hover);
}
.rb-gallery-item[aria-pressed="true"],
.rb-gallery-item[aria-checked="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.rb-gallery-more {
  display: grid;
  place-items: center;
  width: 18px;
  padding: 0;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--text-3);
}
.rb-gallery-more:hover {
  background: var(--bg-hover);
}
.styles-gallery .rb-gallery-items {
  grid-template-columns: repeat(3, 104px);
  grid-auto-flow: row;
  grid-template-rows: none;
}
.styles-gallery .rb-gallery-item {
  height: 30px;
  overflow: hidden;
}
.style-preview {
  overflow: hidden;
  text-overflow: ellipsis;
}
.style-preview.h1 { font-size: 15px; font-weight: 600; color: #1e4e8c; }
.style-preview.h2 { font-size: 14px; font-weight: 600; color: #2e75b6; }
.style-preview.h3 { font-size: 13px; font-weight: 600; color: #2e75b6; }
.style-preview.h4 { font-size: 12px; font-style: italic; font-weight: 600; color: #2e75b6; }
.style-preview.h5 { font-size: 12px; font-weight: 600; color: #3b6e2f; }
.style-preview.h6 { font-size: 12px; font-style: italic; color: #3b6e2f; }
.style-preview.title { font-size: 14px; font-weight: 300; }
.style-preview.cite { font-size: 11px; color: var(--text-3); }
.style-preview.quote { font-style: italic; color: var(--text-2); }
.style-preview.code { font-family: var(--font-mono); font-size: 11px; }
:root[data-theme-resolved="dark"] .style-preview.h1,
:root[data-theme-resolved="dark"] .style-preview.h2,
:root[data-theme-resolved="dark"] .style-preview.h3,
:root[data-theme-resolved="dark"] .style-preview.h4 { color: #8fbaf0; }
:root[data-theme-resolved="dark"] .style-preview.h5,
:root[data-theme-resolved="dark"] .style-preview.h6 { color: #9fd18f; }
.tags-gallery .rb-gallery-items {
  grid-template-columns: repeat(2, 150px);
  grid-auto-flow: row;
  grid-template-rows: none;
}
.tags-gallery .rb-gallery-item {
  height: 21px;
  font-size: 12px;
}
.tag-glyph {
  display: inline-block;
  width: 16px;
  height: 16px;
  flex: none;
  background: var(--tag-color);
  mask: var(--tag-icon) center / 16px 16px no-repeat;
  -webkit-mask: var(--tag-icon) center / 16px 16px no-repeat;
}
.pens-gallery .rb-gallery-items {
  grid-auto-flow: column;
  grid-template-rows: repeat(2, 1fr);
}
.pens-gallery .rb-gallery-item {
  width: 32px;
  height: 30px;
  padding: 0;
  justify-content: center;
}
.pen-glyph {
  width: 22px;
  height: 22px;
}
.shapes-gallery .rb-gallery-items {
  /* Two rows fill the gallery's height instead of leaving it half empty. */
  grid-template-columns: repeat(4, 26px);
  grid-auto-flow: row;
  grid-template-rows: none;
  align-content: center;
  gap: 2px;
  padding: 4px;
}
.shapes-gallery .rb-gallery-item {
  width: 26px;
  height: 26px;
  padding: 0;
  justify-content: center;
}
.shapes-gallery .icon:not(.ico) {
  color: var(--accent-text);
}

/* ---------- workspace ---------- */
.workspace {
  display: flex;
  min-height: 0;
  min-width: 0;
  border-top: 1px solid var(--line);
  background: var(--bg-pane);
}
.rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex: none;
  width: var(--rail-w);
  padding: 4px 0 10px;
  border-right: 1px solid var(--line);
  background: var(--bg-rail);
}
.rail-btn {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--rail-w);
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-2);
}
.rail-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.rail-btn[aria-pressed="true"],
.rail-btn[aria-current="true"] {
  background: var(--bg-selected-strong);
  color: var(--accent-text);
}
.rail-btn[aria-pressed="true"]::before,
.rail-btn[aria-current="true"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--accent);
}
.rail-spacer {
  flex: 1;
}
.avatar-btn {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: #0f6c6c;
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  overflow: hidden;
}
.avatar-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.avatar-btn:hover {
  outline: 2px solid var(--line-strong);
}

.nav {
  display: flex;
  flex: none;
  min-width: 0;
}
.nav[hidden] {
  display: none;
}
.pane {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border-right: 1px solid var(--line-2);
  background: var(--bg-pane);
}
.sections-pane {
  width: var(--sections-w);
}
.pages-pane {
  width: var(--pages-w);
}
.pane-head {
  display: flex;
  align-items: center;
  height: 44px;
  flex: none;
  padding: 0 6px 0 8px;
}
.pane-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding-bottom: 8px;
}
.pane-foot {
  display: flex;
  align-items: center;
  flex: none;
  height: 44px;
  padding: 0 8px;
  border-top: 1px solid var(--line);
}
.pane-add {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 10px;
  border: 0;
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--accent-text);
  font-size: 14px;
  font-weight: 600;
}
.pane-add:hover {
  background: var(--bg-hover);
}
.pane-resizer {
  position: absolute;
  top: 0;
  bottom: 0;
  right: -4px;
  width: 8px;
  z-index: 5;
  cursor: col-resize;
}
.pane-resizer:hover,
.pane-resizer.dragging {
  background: var(--focus);
  opacity: 0.35;
}
.nb-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
  height: 34px;
  padding: 0 6px;
  border: 0;
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
}
.nb-picker:hover {
  background: var(--bg-hover);
}
.nb-picker .nb-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.nb-glyph {
  display: block;
  flex: none;
  width: 14px;
  height: 18px;
  border-radius: 2px;
  background: var(--nb-color, var(--accent));
  position: relative;
}
.nb-glyph::after {
  content: "";
  position: absolute;
  right: 2px;
  top: 3px;
  width: 2px;
  height: 4px;
  border-radius: 1px;
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 6px 0 rgba(255, 255, 255, 0.85);
}

/* tree rows (sections and pages) */
.tree {
  list-style: none;
  margin: 0;
  padding: 0;
}
.tree .tree {
  padding-left: 0;
}
.row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 0 8px 0 calc(12px + var(--depth, 0) * 14px);
  color: var(--text);
  font-size: 14px;
  user-select: none;
  outline: none;
}
.row:hover {
  background: var(--bg-hover);
}
.row[aria-selected="true"] {
  background: var(--bg-selected);
}
.row:focus-visible {
  box-shadow: inset 0 0 0 2px var(--focus);
}
.row-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.row-label.untitled {
  color: var(--text-3);
  font-style: italic;
}
.row-meta {
  color: var(--text-3);
  font-size: 11px;
}
.section-tab {
  flex: none;
  width: 6px;
  height: 22px;
  margin-left: -4px;
  border-radius: 3px;
  background: var(--sec-color);
}
.row .lock {
  color: var(--text-3);
}
.row-twisty {
  display: grid;
  place-items: center;
  flex: none;
  width: 18px;
  height: 18px;
  margin-left: -4px;
  padding: 0;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: var(--text-3);
}
.row-twisty:hover {
  background: var(--bg-active);
}
.row-twisty[aria-expanded="false"] .icon {
  transform: rotate(-90deg);
}
.group-icon {
  color: var(--text-3);
}
.page-row {
  padding-left: calc(14px + var(--level, 0) * 16px);
  min-height: 36px;
}
.page-row .row-twisty {
  margin-left: -16px;
}
.page-row[data-level="0"] .row-label {
  font-weight: 400;
}
.row.drop-before::after,
.row.drop-after::after {
  content: "";
  position: absolute;
  left: calc(8px + var(--drop-indent, 0px));
  right: 6px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
}
.row.drop-before::after {
  top: -1px;
}
.row.drop-after::after {
  bottom: -1px;
}
.row.drop-into {
  box-shadow: inset 0 0 0 2px var(--accent);
}
.row.dragging {
  opacity: 0.45;
}
.row-rename {
  flex: 1;
  min-width: 0;
  height: 26px;
  padding: 0 6px;
  border: 1px solid var(--focus);
  border-radius: var(--radius-s);
  background: var(--bg-input);
  font-size: 14px;
}
.row-rename:focus {
  outline: none;
}
.pane-empty {
  padding: 16px 14px;
  color: var(--text-3);
  font-size: 13px;
  line-height: 1.5;
}

/* side panels in the nav column (search, recent) */
.side-panel {
  display: flex;
  flex-direction: column;
  width: calc(var(--sections-w) + var(--pages-w));
  min-width: 0;
  border-right: 1px solid var(--line-2);
  background: var(--bg-pane);
}
.side-head {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 8px 0 14px;
  flex: none;
}
.side-title {
  flex: 1;
  margin: 0;
  font-size: 15px;
  font-weight: 600;
}
.side-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}
.search-box {
  position: relative;
  margin: 0 10px 8px;
}
.search-box .icon {
  position: absolute;
  left: 9px;
  top: 8px;
  color: var(--text-3);
  pointer-events: none;
}
.search-box .input {
  padding-left: 30px;
}
.search-scope {
  display: flex;
  gap: 6px;
  align-items: center;
  margin: 0 10px 8px;
  color: var(--text-3);
  font-size: 12px;
}
.search-scope select {
  flex: 1;
  min-width: 0;
  height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  background: var(--bg-input);
  font-size: 12px;
}
.result {
  display: block;
  width: 100%;
  padding: 8px 14px;
  border: 0;
  border-bottom: 1px solid var(--line-2);
  background: transparent;
  color: var(--text);
  text-align: left;
}
.result:hover {
  background: var(--bg-hover);
}
.result:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--focus);
}
.result[aria-current="true"] {
  background: var(--bg-selected);
}
.result-title {
  font-weight: 600;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.result-path {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 2px;
  color: var(--text-3);
  font-size: 11px;
}
.result-path .dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--sec-color);
}
.result-snippet {
  margin-top: 3px;
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.result-snippet mark {
  background: var(--find-hit);
  color: inherit;
  border-radius: 2px;
}
.group-label {
  padding: 10px 14px 4px;
  color: var(--text-3);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------- canvas column ---------- */
.main {
  position: relative;
  display: flex;
  flex: 1;
  min-width: 0;
  min-height: 0;
  background: var(--bg-page);
}
.canvas-col {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}
.task-pane {
  display: flex;
  flex-direction: column;
  width: 300px;
  flex: none;
  border-left: 1px solid var(--line);
  background: var(--bg-pane);
  min-height: 0;
}
.task-pane[hidden] {
  display: none;
}

/* ---------- full page view ---------- */
.app.full-page .ribbon-panel,
.app.full-page .rail,
.app.full-page .nav {
  display: none;
}

/* ---------- tablet ---------- */
@media (max-width: 1100px) {
  :root {
    --sections-w: 150px;
    --pages-w: 150px;
  }
  .tell-me input {
    width: 110px;
  }
  .task-pane {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 40;
    box-shadow: -8px 0 24px rgba(0, 0, 0, 0.12);
  }
}

/* ---------- phone ---------- */
@media (max-width: 760px) {
  :root {
    --titlebar-h: 48px;
  }
  .app {
    grid-template-rows: var(--titlebar-h) auto 1fr auto;
  }
  .titlebar {
    grid-template-columns: auto 1fr auto;
    padding: 0 4px;
    padding-top: env(safe-area-inset-top);
  }
  .titlebar .icon-btn {
    width: 40px;
    height: 40px;
  }
  .titlebar-title {
    max-width: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
  }
  .app-mark,
  .desktop-only,
  .tell-me,
  .ribbon-collapse {
    display: none !important;
  }
  .mobile-only {
    display: inline-grid !important;
  }
  .share-btn span {
    display: none;
  }
  .ribbon {
    padding: 0 0 4px;
  }
  .ribbon-tabs-row {
    padding: 0 6px;
  }
  .ribbon-panel {
    height: auto;
    min-height: 0;
    margin: 0 6px;
    padding: 2px 4px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .ribbon-toolbar {
    flex-wrap: nowrap;
  }
  .rb-group {
    padding: 0 3px;
  }
  .rb-btn.big {
    flex-direction: row;
    height: 40px;
    min-width: 40px;
    padding: 0 6px;
  }
  .rb-btn.big .icon {
    width: 20px;
    height: 20px;
  }
  .rb-btn.big .rb-label,
  .rb-btn .rb-label.hide-phone {
    display: none;
  }
  /* Without its label, a menu button still shows its caret. */
  .rb-btn.big.dropdown .rb-label {
    display: inline-flex;
    font-size: 0;
  }
  .rb-btn {
    min-width: 40px;
    height: 40px;
  }
  .rb-split.big {
    flex-direction: row;
  }
  .rb-split.big > .rb-btn:first-child,
  .rb-split.big > .rb-btn + .rb-btn {
    align-items: center;
    height: 40px;
    min-width: 20px;
    border-radius: var(--radius-s);
  }
  .rb-stack {
    flex-direction: row;
  }
  .rb-gallery {
    display: none;
  }
  .rb-gallery-fallback {
    display: inline-flex !important;
  }
  .workspace {
    position: relative;
  }
  .rail {
    display: none;
  }
  .nav {
    position: absolute;
    inset: 0;
    z-index: 30;
    width: 100%;
  }
  .nav .pane,
  .side-panel {
    width: 100% !important;
    border-right: 0;
  }
  .app[data-mobile-view="sections"] .pages-pane,
  .app[data-mobile-view="pages"] .sections-pane {
    display: none;
  }
  .app[data-mobile-view="page"] .nav {
    display: none;
  }
  .app:not([data-mobile-view="page"]) .ribbon {
    display: none;
  }
  .app:not([data-mobile-view="page"]) .main {
    visibility: hidden;
  }
  .pane-resizer {
    display: none;
  }
  .row {
    min-height: 48px;
    font-size: 16px;
  }
  .pane-head {
    height: 52px;
  }
  .app .bottom-bar {
    display: flex !important;
  }
  .app[data-mobile-view="sections"] .mobile-back {
    display: none !important;
  }
  .rb-stack .rb-label {
    display: none;
  }
  .app[data-mobile-view="page"] .bottom-bar {
    display: none !important;
  }
  .task-pane {
    width: 100%;
    box-shadow: none;
  }
}

.rb-gallery-fallback {
  display: none !important;
}

.bottom-bar {
  display: none !important;
  justify-content: space-around;
  align-items: stretch;
  height: calc(56px + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  border-top: 1px solid var(--line);
  background: var(--bg-rail);
}
.bottom-bar button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font-size: 11px;
}
.bottom-bar button[aria-pressed="true"] {
  color: var(--accent-text);
  font-weight: 600;
}

/* ---------- ribbon density steps (set by Ribbon.fit) ---------- */
.rb-gallery-wrap.collapsed .rb-gallery,
.ribbon-panel[data-fit="1"] .rb-gallery,
.ribbon-panel[data-fit="2"] .rb-gallery,
.ribbon-panel[data-fit="3"] .rb-gallery {
  display: none;
}
.ribbon-panel .rb-gallery-wrap.collapsed .rb-gallery-fallback,
.ribbon-panel[data-fit="1"] .rb-gallery-fallback,
.ribbon-panel[data-fit="2"] .rb-gallery-fallback,
.ribbon-panel[data-fit="3"] .rb-gallery-fallback {
  display: inline-flex !important;
  align-self: center;
}
.ribbon-panel[data-fit="2"] .rb-btn.big,
.ribbon-panel[data-fit="3"] .rb-btn.big {
  min-width: 36px;
  height: 56px;
  padding: 4px 2px;
}
.ribbon-panel[data-fit="2"] .rb-split.big > .rb-btn:first-child {
  height: 29px;
  padding: 4px 2px 0;
}
.ribbon-panel[data-fit="2"] .rb-split.big > .rb-btn + .rb-btn {
  height: 27px;
}
.ribbon-panel[data-fit="2"] .rb-btn.big .icon,
.ribbon-panel[data-fit="3"] .rb-btn.big .icon {
  width: 22px;
  height: 22px;
}
.ribbon-panel[data-fit="3"] .rb-btn.big .rb-label,
.ribbon-panel[data-fit="3"] .rb-btn .rb-label.hide-phone {
  display: none;
}
.ribbon-panel[data-fit="3"] .rb-btn.big.dropdown {
  flex-direction: row;
  gap: 1px;
}
.ribbon-panel[data-fit="3"] .rb-btn.big.dropdown .rb-label {
  display: inline-flex;
  font-size: 0;
}
.ribbon-panel[data-fit="3"] {
  overflow-x: auto;
  scrollbar-width: thin;
}
.ribbon-panel[data-fit="3"] .rb-btn.big {
  height: 40px;
  justify-content: center;
}
/* The compact ribbon is one row of icons, centered in the panel. */
.ribbon-panel[data-fit="3"] .rb-group {
  align-items: center;
}
.ribbon-panel[data-fit="3"] .rb-split.big {
  flex-direction: row;
}
.ribbon-panel[data-fit="3"] .rb-split.big > .rb-btn:first-child {
  border-radius: var(--radius-s) 0 0 var(--radius-s);
}
.ribbon-panel[data-fit="3"] .rb-split.big > .rb-btn + .rb-btn {
  height: 40px;
  min-width: 14px;
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}
.ribbon-panel[data-fit="3"] .rb-split.big > .rb-btn + .rb-btn > span {
  display: none;
}
.mobile-only-text {
  display: none;
}
.rb-nowrap {
  white-space: nowrap;
}
.rb-caret.inline {
  display: inline-block;
  margin-left: 2px;
  vertical-align: middle;
}
.rb-caret.inline .icon {
  display: inline-block;
  width: 10px !important;
  height: 10px !important;
}

/* Glass ribbon commands, as in the Spreadsheet app: hover and pressed states are frosted pills, lit
   along the top edge, that the glass icons (icons.css) sit in; large commands lift their icon with a
   soft shadow. */
:root {
  --ribbon-glass: linear-gradient(rgba(255, 255, 255, 0.95), rgba(243, 245, 249, 0.8));
  --ribbon-glass-pressed: linear-gradient(rgba(0, 122, 255, 0.1), rgba(0, 122, 255, 0.16));
  --ribbon-glass-edge: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 0 0 0.5px rgba(0, 0, 0, 0.12), 0 1px 3px rgba(0, 0, 0, 0.08);
  --ribbon-glass-pressed-edge: inset 0 1px 0 rgba(255, 255, 255, 0.6), inset 0 0 0 0.5px rgba(0, 122, 255, 0.3);
  --ribbon-icon-lift: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.1));
}
:root[data-theme-resolved="dark"] {
  --ribbon-glass: linear-gradient(rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.07));
  --ribbon-glass-pressed: linear-gradient(rgba(10, 132, 255, 0.24), rgba(10, 132, 255, 0.16));
  --ribbon-glass-edge: inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 0 0 0.5px rgba(255, 255, 255, 0.12), 0 1px 3px rgba(0, 0, 0, 0.4);
  --ribbon-glass-pressed-edge: inset 0 1px 0 rgba(255, 255, 255, 0.12), inset 0 0 0 0.5px rgba(10, 132, 255, 0.45);
  --ribbon-icon-lift: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.45));
}
.ribbon-panel .rb-btn { border-radius: 7px; transition: background-color 0.12s, box-shadow 0.12s; }
.ribbon-panel .rb-btn.big { border-radius: 10px; }
.ribbon-panel .rb-split { border-radius: 7px; }
.ribbon-panel .rb-split.big { border-radius: 10px; }
.ribbon-panel .rb-split > .rb-btn:first-child { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.ribbon-panel .rb-split > .rb-btn + .rb-btn { border-top-left-radius: 0; border-bottom-left-radius: 0; }
.ribbon-panel .rb-split.big > .rb-btn:first-child { border-radius: 10px 10px 0 0; }
.ribbon-panel .rb-split.big > .rb-btn + .rb-btn { border-radius: 0 0 10px 10px; }
.ribbon-panel .rb-btn[aria-pressed="true"],
.ribbon-panel .rb-btn[aria-expanded="true"] { border-color: transparent; background: var(--ribbon-glass-pressed); box-shadow: var(--ribbon-glass-pressed-edge); }
@media (hover: hover) {
  .ribbon-panel .rb-btn:hover:not(:disabled) { background: var(--ribbon-glass); box-shadow: var(--ribbon-glass-edge); }
  .ribbon-panel .rb-btn[aria-pressed="true"]:hover:not(:disabled),
  .ribbon-panel .rb-btn[aria-expanded="true"]:hover:not(:disabled) { background: var(--ribbon-glass-pressed); box-shadow: var(--ribbon-glass-pressed-edge), 0 1px 3px rgba(0, 0, 0, 0.08); }
  .ribbon-panel .rb-split:hover { box-shadow: var(--ribbon-glass-edge); }
  .ribbon-panel .rb-split:hover > .rb-btn { border-color: transparent; }
  .ribbon-panel .rb-split:hover > .rb-btn:hover:not(:disabled) { box-shadow: none; }
}
.ribbon-panel .rb-btn:active:not(:disabled) { background: var(--ribbon-glass-pressed); box-shadow: var(--ribbon-glass-pressed-edge); }
.ribbon-panel .rb-btn.big > svg.ico { filter: var(--ribbon-icon-lift); }
@media (prefers-reduced-motion: reduce) { .ribbon-panel .rb-btn { transition: none; } }
@media (forced-colors: active) {
  .ribbon-panel .rb-btn,
  .ribbon-panel .rb-btn:hover,
  .ribbon-panel .rb-btn[aria-pressed="true"],
  .ribbon-panel .rb-split:hover { box-shadow: none; }
  .ribbon-panel .rb-btn[aria-pressed="true"] { border-color: Highlight; }
  .ribbon-panel .rb-btn.big > svg.ico { filter: none; }
}