:root {
  color-scheme: light;
  --chrome: #f5f6f8;
  --chrome-2: #eceff3;
  --surface: #ffffff;
  --ink: #111318;
  --muted: #66707d;
  --line: #cfd5dd;
  --line-strong: #aeb7c2;
  --active: #2f6fed;
  --active-soft: #e8f0ff;
  --hover: #eef3f8;
  --danger: #b44747;
  --canvas: #ffffff;
  --chrome-font-size: 16px;
  --editor-topbar-height: 94px;
  --selection-status-bar-height: 26px;
  --toolbar-primary-height: 52px;
  --toolbar-secondary-height: 42px;
  --toolbar-row-padding-y: 3px;
  --toolbar-row-padding-x: 8px;
  --toolbar-primary-gap: 7px;
  --toolbar-secondary-gap: 4px;
  --toolbar-group-gap: 3px;
  --toolbar-divider-height: 24px;
  --toolbar-divider-margin: 4px;
  --icon-button-size: 43px;
  --icon-svg-size: 30px;
  --toolbar-control-height: 36px;
  --zoom-input-width: 74px;
  --style-button-min-width: 92px;
  --tool-rail-width: 52px;
  --tool-rail-padding-y: 6px;
  --tool-rail-padding-x: 3px;
  --tool-rail-gap: 4px;
  --tool-button-width: 44px;
  --tool-button-height: 40px;
  --tool-icon-size: var(--icon-svg-size);
  --secondary-button-width: 41px;
  --secondary-button-height: 37px;
  --secondary-arrow-endpoint-width: 46px;
  --secondary-script-width: 44px;
  --secondary-field-height: 25px;
  --secondary-divider-height: 22px;
  --secondary-divider-margin: 4px;
  --cc-icon-stroke-thin: 1.65;
  --cc-icon-stroke-thick: 4.6px;
  --chrome-svg-stroke-width: var(--cc-icon-stroke-thin);
  --cc-bond-stroke-width: var(--cc-icon-stroke-thin);
  --cc-bond-hash-stroke-width: var(--cc-icon-stroke-thick);
  --cc-arrow-stroke-width: var(--cc-icon-stroke-thin);
  --cc-arrow-bold-stroke-width: var(--cc-icon-stroke-thick);
  --cc-main-stroke-width: var(--cc-icon-stroke-thin);
  --cc-soft-stroke-width: var(--cc-icon-stroke-thin);
  --cc-text-stroke-width: var(--cc-icon-stroke-thick);
  --cc-select-stroke-width: var(--cc-icon-stroke-thin);
  --cc-shadow-stroke-width: var(--cc-icon-stroke-thin);
  --cc-shadow-edge-stroke-width: var(--cc-icon-stroke-thin);
  --cc-distribute-stroke-width: var(--cc-icon-stroke-thick);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}

body.desktop-shell {
  display: grid;
  grid-template-rows: 42px minmax(0, 1fr);
}

body.browser-shell {
  display: block;
}

button,
input,
select {
  font: inherit;
}

button {
  color: inherit;
}

#viewer-svg [data-layer="document-content"],
#viewer-svg [data-layer="document-content"] * {
  pointer-events: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.editor-shell {
  display: grid;
  grid-template-columns: var(--tool-rail-width) minmax(0, 1fr);
  grid-template-rows: var(--editor-topbar-height) minmax(0, 1fr) var(--selection-status-bar-height);
  width: 100vw;
  height: 100vh;
  background: var(--canvas);
}

body.desktop-shell .editor-shell {
  height: auto;
  min-height: 0;
  grid-template-rows: var(--editor-topbar-height) minmax(0, 1fr) var(--selection-status-bar-height);
}

.editor-topbar {
  grid-column: 1 / -1;
  grid-row: 1;
  display: grid;
  grid-template-rows: var(--toolbar-primary-height) var(--toolbar-secondary-height);
  border-bottom: 1px solid var(--line-strong);
  background: var(--chrome);
  font-size: var(--chrome-font-size);
  user-select: none;
}

body.desktop-shell .editor-topbar {
  grid-template-rows: var(--toolbar-primary-height) var(--toolbar-secondary-height);
}

.desktop-titlebar {
  display: none;
  min-width: 0;
  height: 42px;
  background: #d6e5ee;
  border-bottom: 1px solid #b7c7d3;
  color: #111318;
  user-select: none;
}

body.desktop-shell .desktop-titlebar {
  display: flex;
  align-items: end;
}

.titlebar-brand {
  flex: 0 0 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  padding: 6px;
}

.titlebar-brand img {
  width: 24px;
  height: 24px;
  display: block;
  object-fit: contain;
  pointer-events: none;
  user-select: none;
}

.titlebar-drag-region {
  flex: 1 1 auto;
  align-self: stretch;
  min-width: 24px;
}

.canvas-pointer-shield {
  position: fixed;
  inset: 0;
  display: none;
  cursor: inherit;
  pointer-events: auto;
  z-index: 1000;
}

.canvas-pointer-shield.is-active {
  display: block;
}

.canvas-drag-preview-svg {
  position: fixed;
  display: block;
  overflow: visible;
  pointer-events: none;
}

#viewer-svg.is-pointer-capture-disabled {
  pointer-events: none;
}

.desktop-modal-window-drag-strip,
.desktop-dialog-panel-drag-strip {
  display: none;
}

body.desktop-shell .desktop-modal-window-drag-strip {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  display: block;
  height: 42px;
}

body.desktop-shell .desktop-dialog-panel-drag-strip {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: block;
  height: 14px;
}

.window-controls {
  flex: 0 0 138px;
  display: grid;
  grid-template-columns: repeat(3, 46px);
  align-self: stretch;
  justify-self: end;
}

.window-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 38px;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #111318;
  cursor: default;
}

.window-control:hover {
  background: rgba(17, 19, 24, 0.1);
}

.window-control-close:hover {
  background: #c42b1c;
  color: #ffffff;
}

.window-control svg {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.25;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.window-icon-restore {
  display: none;
}

body.is-window-maximized .window-icon-maximize {
  display: none;
}

body.is-window-maximized .window-icon-restore {
  display: block;
}

.document-tabbar {
  box-sizing: border-box;
  flex: 0 1 auto;
  display: flex;
  align-items: end;
  min-width: 0;
  max-width: calc(100% - 220px);
  align-self: stretch;
  padding: 5px 4px 0 0;
  gap: 4px;
  background: transparent;
}

body.browser-shell .document-tabbar {
  display: none;
}

.document-tabs {
  display: flex;
  align-items: end;
  min-width: 0;
  max-width: none;
  flex: 0 1 auto;
  gap: 2px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.document-tabs::-webkit-scrollbar {
  display: none;
}

.document-tab {
  flex: 0 1 auto;
  width: clamp(155px, 22vw, 360px);
  min-width: 155px;
  max-width: 360px;
  height: 31px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 6px 0 14px;
  border: 1px solid transparent;
  border-bottom-color: #b7c7d3;
  border-radius: 9px 9px 0 0;
  background: transparent;
  color: #43505c;
  cursor: default;
  position: relative;
}

.document-tab:hover {
  background: rgba(255, 255, 255, 0.45);
}

.document-tab.is-active {
  height: 37px;
  background: var(--chrome);
  border-color: #b8c8d4;
  border-bottom-color: var(--chrome);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(17, 19, 24, 0.08);
  z-index: 1;
}

.document-tab.is-dragging {
  opacity: 0.55;
}

.document-tab-title {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

.document-tab.is-active .document-tab-title {
  font-weight: 700;
}

.document-tab-close,
.document-tab-new {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  background: transparent;
  color: currentColor;
  cursor: pointer;
}

.document-tab-close {
  flex: 0 0 auto;
  width: 27px;
  height: 27px;
  margin-left: auto;
  border-radius: 5px;
  opacity: 0;
  pointer-events: none;
}

.document-tab.is-active .document-tab-close,
.document-tab:hover .document-tab-close,
.document-tab:focus-within .document-tab-close {
  opacity: 1;
  pointer-events: auto;
}

.document-tab-close:hover,
.document-tab-new:hover {
  background: rgba(17, 19, 24, 0.08);
}

.document-tab-new {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  margin: 0 4px 3px 3px;
  border-radius: 7px;
  color: var(--ink);
  font-size: 23px;
  font-weight: 400;
  line-height: 1;
}

.document-tab-close svg {
  width: 19px;
  height: 19px;
}

.document-tab-close svg path {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.toolbar-row {
  display: flex;
  align-items: center;
  min-width: 0;
  padding: var(--toolbar-row-padding-y) var(--toolbar-row-padding-x);
}

.toolbar-row-primary {
  gap: var(--toolbar-primary-gap);
}

.toolbar-row-secondary {
  gap: var(--toolbar-secondary-gap);
  overflow-x: auto;
  overflow-y: hidden;
  border-top: 1px solid var(--line);
  background: var(--chrome-2);
}

.toolbar-group {
  display: inline-flex;
  align-items: center;
  gap: var(--toolbar-group-gap);
}

.toolbar-divider {
  width: 1px;
  height: var(--toolbar-divider-height);
  margin: 0 var(--toolbar-divider-margin);
  background: var(--line-strong);
}

.icon-button,
.tool-button,
.secondary-button,
.color-button,
.color-picker-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.icon-button {
  width: var(--icon-button-size);
  height: var(--icon-button-size);
}

.icon-button:hover,
.tool-button:hover,
.secondary-button:hover,
.color-button:hover,
.color-picker-button:hover {
  border-color: var(--line-strong);
  background: var(--hover);
}

.icon-button:disabled {
  cursor: default;
  opacity: 0.35;
}

.icon-button:disabled:hover {
  border-color: transparent;
  background: transparent;
}

.icon-button.is-active {
  border-color: var(--line-strong);
  background: var(--active);
}

.icon-button:active,
.tool-button:active,
.secondary-button:active,
.color-button:active,
.color-picker-button:active {
  transform: translateY(1px);
}

.icon-button svg,
.tool-button svg,
.secondary-button svg {
  width: var(--icon-svg-size);
  height: var(--icon-svg-size);
  overflow: visible;
}

.editor-topbar svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) path,
.editor-topbar svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) rect,
.editor-topbar svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) circle,
.tool-rail svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) path,
.tool-rail svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) rect,
.tool-rail svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) circle,
.tool-rail svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) polygon,
.quick-palette svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) path,
.quick-palette svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) rect,
.quick-palette svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) circle,
.quick-palette svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) polygon,
.toolbar-row-secondary svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) path,
.toolbar-row-secondary svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) rect,
.toolbar-row-secondary svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) circle,
.toolbar-row-secondary svg:not(.cc-bond-icon):not(.cc-kernel-arrow-icon):not(.cc-kernel-shape-icon):not(.cc-kernel-symbol-icon):not(.cc-kernel-orbital-icon):not(.cc-kernel-chain-icon) polygon {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--chrome-svg-stroke-width);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool-rail svg text,
.quick-palette svg text,
.toolbar-row-secondary svg text {
  fill: currentColor;
  stroke: none;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}

.cc-element-icon-text {
  font-size: 10pt;
  font-weight: 400;
}

.cc-element-tick {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
}

.editor-topbar svg .filled,
.tool-rail svg .filled,
.quick-palette svg .filled,
.toolbar-row-secondary svg .filled {
  fill: currentColor;
  stroke: currentColor;
}

.toolbar-row-secondary svg .soft-fill {
  fill: rgba(47, 111, 237, 0.14);
}

.chemcore-icon {
  color: currentColor;
}

.chemcore-icon.cc-bond-icon polygon {
  stroke: none;
  stroke-width: 0;
}

.chemcore-icon.cc-bond-icon polygon[fill="currentColor"],
.chemcore-icon.cc-bond-icon path[fill="currentColor"] {
  fill: currentColor;
  stroke: none;
}

.chemcore-icon.cc-bond-icon polygon[fill="#ffffff"],
.chemcore-icon.cc-bond-icon path[fill="#ffffff"] {
  fill: #ffffff;
  stroke: none;
}

.chemcore-icon.cc-bond-icon path[fill="none"] {
  fill: none;
  stroke: currentColor;
}

.chemcore-icon .cc-stroke,
.chemcore-icon .cc-stroke-strong,
.chemcore-icon .cc-bond-strong,
.chemcore-icon .cc-bond,
.chemcore-icon .cc-bond-hash,
.chemcore-icon .cc-arrow,
.chemcore-icon .cc-shape,
.chemcore-icon .cc-ring {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.chemcore-icon .cc-bond {
  stroke-width: var(--cc-bond-stroke-width);
  stroke-linecap: butt;
}

.chemcore-icon .cc-bond-strong {
  stroke-width: var(--cc-icon-stroke-thick);
  stroke-linecap: butt;
}

.chemcore-icon .cc-bond-hash {
  stroke-width: var(--cc-bond-hash-stroke-width);
  stroke-linecap: butt;
}

.chemcore-icon .cc-arrow {
  stroke-width: var(--cc-arrow-stroke-width);
}

.chemcore-icon .cc-arrow-butt {
  stroke-linecap: butt;
}

.chemcore-icon .cc-arrow-bold {
  stroke-width: var(--cc-arrow-bold-stroke-width);
}

.chemcore-icon .cc-shape,
.chemcore-icon .cc-ring,
.chemcore-icon .cc-stroke,
.chemcore-icon .cc-guide {
  stroke-width: var(--cc-main-stroke-width);
}

.chemcore-icon .cc-stroke-strong {
  stroke-width: var(--cc-icon-stroke-thick);
}

.chemcore-icon .cc-stroke-soft {
  stroke-width: var(--cc-soft-stroke-width);
}

.chemcore-icon .cc-delete-stroke,
.chemcore-icon .cc-delete-soft {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.chemcore-icon .cc-delete-stroke {
  stroke-width: var(--cc-main-stroke-width);
}

.chemcore-icon .cc-delete-soft {
  stroke-width: var(--cc-soft-stroke-width);
}

.chemcore-icon .cc-guide {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  opacity: 0.74;
}

.chemcore-icon .cc-fill,
.chemcore-icon .cc-bond-fill,
.chemcore-icon .cc-arrow-fill,
.chemcore-icon .cc-dot {
  fill: currentColor;
  stroke: none;
}

.chemcore-icon .cc-fill-outline {
  fill: currentColor;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.chemcore-icon .cc-blue-dot {
  fill: var(--active);
}

.chemcore-icon .cc-shape-fill {
  fill: currentColor;
  stroke: currentColor;
}

.chemcore-icon .cc-shape-soft-fill {
  fill: rgba(47, 111, 237, 0.16);
  stroke: currentColor;
}

.chemcore-icon .cc-shadow-fill {
  fill: rgba(17, 19, 24, 0.14);
  stroke: currentColor;
  stroke-width: var(--cc-shadow-stroke-width);
  stroke-linejoin: round;
}

.chemcore-icon .cc-shadow-edge {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-shadow-edge-stroke-width);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chemcore-icon .cc-distribute-fill {
  fill: currentColor;
  stroke: currentColor;
  stroke-width: var(--cc-distribute-stroke-width);
}

.chemcore-icon .cc-empty-fill {
  fill: none;
}

.chemcore-icon .cc-select-fill {
  stroke: currentColor;
  stroke-width: var(--cc-select-stroke-width);
  stroke-linejoin: round;
}

.chemcore-icon .cc-icon-label {
  fill: currentColor;
  stroke: none;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 5.75px;
  font-weight: 700;
  letter-spacing: 0;
}

.chemcore-icon .cc-icon-label-small {
  font-size: 4.8px;
}

.chemcore-icon .cc-text-stroke,
.chemcore-icon .cc-text-underline {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.chemcore-icon .cc-text-stroke {
  stroke-width: var(--cc-text-stroke-width);
}

.chemcore-icon .cc-text-underline {
  stroke-width: var(--cc-main-stroke-width);
}

.chemcore-icon .cc-chemical-main,
.chemcore-icon .cc-chemical-sub,
.chemcore-icon .cc-chemical-sup,
.chemcore-icon .cc-script-main,
.chemcore-icon .cc-script-sub,
.chemcore-icon .cc-script-sup {
  fill: currentColor;
  stroke: none;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-weight: 700;
  letter-spacing: 0;
}

.chemcore-icon .cc-italic-glyph {
  fill: currentColor;
  stroke: none;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 18.5px;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
}

.chemcore-icon .cc-chemical-main {
  font-size: 10.8px;
}

.chemcore-icon .cc-chemical-sub {
  font-size: 6.25px;
}

.chemcore-icon .cc-chemical-sup {
  font-size: 6px;
}

.chemcore-icon .cc-script-main {
  font-size: 12.4px;
  font-style: italic;
}

.chemcore-icon .cc-script-sub,
.chemcore-icon .cc-script-sup {
  font-size: 6.9px;
}

.secondary-button:has(.cc-arrow-endpoint-icon) {
  width: var(--secondary-arrow-endpoint-width);
}

.secondary-button:has(.cc-script-icon) {
  width: var(--secondary-script-width);
}

.zoom-group {
  gap: var(--toolbar-secondary-gap);
}

.zoom-input {
  width: var(--zoom-input-width);
  height: var(--toolbar-control-height);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0 7px;
  background: var(--surface);
  color: var(--ink);
  outline: none;
}

.document-style-group {
  position: relative;
}

.style-preset-button {
  height: var(--toolbar-control-height);
  min-width: var(--style-button-min-width);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0 10px 0 12px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.style-preset-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.style-preset-button:focus {
  border-color: var(--active);
  box-shadow: 0 0 0 2px var(--active-soft);
}

.style-preset-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 138px;
  padding: 4px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.14);
  z-index: 30;
}

.style-preset-menu button {
  width: 100%;
  height: 30px;
  border: 0;
  border-radius: 4px;
  padding: 0 10px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
}

.style-preset-menu button:hover,
.style-preset-menu button:focus {
  background: var(--active-soft);
  outline: none;
}

.zoom-input:focus {
  border-color: var(--active);
  box-shadow: 0 0 0 2px var(--active-soft);
}

.tool-rail {
  grid-column: 1;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--tool-rail-gap);
  padding: var(--tool-rail-padding-y) var(--tool-rail-padding-x);
  background: var(--chrome);
  font-size: var(--chrome-font-size);
  user-select: none;
  z-index: 4;
}

.tool-button {
  width: var(--tool-button-width);
  height: var(--tool-button-height);
}

.tool-button svg {
  width: var(--tool-icon-size);
  height: var(--tool-icon-size);
}

.tool-button.is-active {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.quick-palette {
  --quick-palette-open-width: min(424px, calc(100vw - 104px));
  --quick-palette-open-height: min(268px, calc(100vh - 92px));
  position: fixed;
  right: 18px;
  bottom: calc(var(--selection-status-bar-height) + 18px);
  z-index: 13;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  pointer-events: none;
}

.quick-palette-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 0 0 auto;
}

.quick-palette-toggle,
.quick-palette-pin,
.text-symbol-cell {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  pointer-events: auto;
}

.quick-palette-toggle {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  box-shadow: 0 3px 10px rgba(17, 19, 24, 0.14);
}

.quick-palette-toggle:hover,
.quick-palette-toggle.is-selected,
.quick-palette-pin:hover,
.text-symbol-cell:hover {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.quick-palette-toggle svg {
  width: 22px;
  height: 22px;
}

.quick-palette-panel {
  width: 0;
  height: var(--quick-palette-open-height);
  max-width: calc(100vw - 8px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--surface);
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  transform: translateX(8px);
  transition: width 140ms ease, opacity 120ms ease, transform 140ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.quick-palette.is-open .quick-palette-panel {
  width: var(--quick-palette-open-width);
  border-color: var(--line-strong);
  box-shadow: 0 8px 26px rgba(17, 19, 24, 0.18);
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

.quick-palette-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 34px;
  gap: 10px;
  padding: 4px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--chrome);
}

.quick-palette-title {
  color: var(--ink);
  font-size: 8pt;
  font-weight: 700;
  white-space: nowrap;
}

.quick-palette-pin {
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 5px;
}

.quick-palette-pin svg {
  width: 16px;
  height: 16px;
  display: block;
}

.quick-palette-pin svg path {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.quick-palette-pin.is-selected {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.quick-palette-content {
  display: none;
  flex: 1 1 auto;
  min-height: 0;
}

.quick-palette[data-mode="symbol"] .text-symbol-content,
.quick-palette[data-mode="element"] .periodic-table-content {
  display: block;
}

.quick-palette[data-mode="element"] .periodic-table-content {
  display: flex;
  align-items: center;
  justify-content: center;
}

.secondary-button {
  width: var(--secondary-button-width);
  height: var(--secondary-button-height);
  flex: 0 0 auto;
  color: var(--ink);
}

.secondary-button.is-selected,
.color-button.is-selected {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.periodic-table-content {
  overflow: hidden;
  padding: 12px 14px;
}

.periodic-element-button {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  pointer-events: auto;
}

.periodic-element-button:hover {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.periodic-element-button.is-selected {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.periodic-element-button.has-element-color:hover,
.periodic-element-button.has-element-color.is-selected {
  outline: 2px solid #2f6fed;
  outline-offset: -2px;
}

.periodic-element-button.has-element-color {
  background: var(--element-bg);
  color: var(--element-fg);
}

.periodic-element-symbol {
  white-space: nowrap;
}

.periodic-table-grid {
  display: grid;
  grid-template-columns: repeat(18, 20px);
  grid-template-rows: repeat(7, 20px) 10px repeat(2, 20px);
  gap: 2px;
  width: max-content;
}

.periodic-element-button {
  width: 20px;
  height: 20px;
  min-width: 20px;
  padding: 0;
  border-radius: 4px;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 8pt;
  line-height: 1;
  text-align: center;
}

.secondary-divider {
  width: 1px;
  height: var(--secondary-divider-height);
  margin: 0 var(--secondary-divider-margin);
  flex: 0 0 auto;
  background: var(--line-strong);
}

.secondary-select,
.secondary-input {
  height: var(--secondary-field-height);
  flex: 0 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--surface);
  color: var(--ink);
  outline: none;
}

.secondary-select {
  min-width: 118px;
  padding: 0 22px 0 7px;
}

.secondary-select[data-text-control="font"] {
  min-width: 144px;
}

.secondary-select[data-text-control="size"] {
  min-width: 60px;
}

.secondary-input {
  width: 52px;
  padding: 0 6px;
  text-align: right;
}

.secondary-input[data-text-control="size"] {
  width: 64px;
}

.color-picker {
  position: relative;
  flex: 0 0 auto;
}

.color-picker-button {
  position: relative;
  width: 33px;
  height: 27px;
  padding: 2px;
}

.color-picker-swatch {
  width: 21px;
  height: 21px;
  border: 1px solid #7f8793;
  border-radius: 50%;
  background: var(--swatch, #000000);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.32);
}

.color-picker-arrow {
  position: absolute;
  right: 2px;
  bottom: 2px;
  width: 11px;
  height: 11px;
}

.color-picker-arrow::after {
  position: absolute;
  right: 0;
  bottom: 0;
  content: "";
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-top: 5px solid #111318;
  filter: drop-shadow(0 0 1px #ffffff) drop-shadow(0 0 1px #ffffff);
}

.color-picker-panel {
  position: fixed;
  top: var(--color-panel-top, 93px);
  left: var(--color-panel-left, 8px);
  z-index: 30;
  display: none;
  width: 132px;
  min-height: 145px;
  padding: 9px 5px 5px;
  border: 1px solid #bfc6d0;
  border-radius: 9px;
  background: #eeeeee;
  box-shadow: 0 2px 6px rgba(17, 19, 24, 0.18);
}

.color-picker.is-open .color-picker-panel {
  display: flex;
  flex-direction: column;
}

.color-panel-grid {
  display: grid;
  grid-template-columns: repeat(4, 21px);
  grid-auto-rows: 21px;
  align-content: start;
  gap: 7px 12px;
  min-height: 52px;
}

.color-panel-swatch {
  width: 21px;
  height: 21px;
  padding: 0;
  border: 1px solid #b6bbc3;
  border-radius: 50%;
  background: var(--swatch, #000000);
  cursor: pointer;
}

.color-panel-swatch.is-selected,
.color-panel-swatch.is-hovered {
  outline: 2px solid #2f6fed;
  outline-offset: 1px;
}

.color-panel-other {
  width: 100%;
  height: 28px;
  margin-top: auto;
  border: 1px solid #c9ced6;
  border-radius: 6px;
  background: #ffffff;
  color: #000000;
  font-family: "Courier New", monospace;
  font-size: 13px;
  cursor: pointer;
}

.color-panel-other.is-hovered,
.color-panel-other:hover {
  border-color: #2f6fed;
  background: #f7fbff;
}

.color-dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(17, 19, 24, 0.18);
}

.color-dialog {
  position: relative;
  z-index: 3;
  width: min(828px, calc(100vw - 24px));
  max-height: calc(100vh - 24px);
  overflow: auto;
  border: 1px solid #c8d0d8;
  border-radius: 6px;
  background: #f3f6f8;
  box-shadow: 0 14px 34px rgba(17, 19, 24, 0.22);
  color: #000000;
}

.color-dialog-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 34px;
  padding: 0 8px 0 14px;
  background: #edf8fb;
  font-size: 15px;
}

.color-dialog-close {
  width: 25px;
  height: 25px;
  border: 0;
  border-radius: 3px;
  background: transparent;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.color-dialog-close:hover {
  background: #e0ebf0;
}

.color-dialog-body {
  display: grid;
  grid-template-columns: 382px 1fr;
  gap: 22px;
  padding: 12px 16px 14px;
}

.color-dialog-label {
  margin: 0 0 7px;
  font-size: 15px;
}

.color-dialog-basic-grid,
.color-dialog-custom-grid {
  display: grid;
  grid-template-columns: repeat(8, 36px);
  grid-auto-rows: 26px;
  gap: 7px 9px;
}

.color-dialog-chip {
  width: 36px;
  height: 26px;
  border: 1px solid #9ca4ad;
  border-radius: 0;
  background: var(--swatch, #000000);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
  cursor: pointer;
}

.color-dialog-chip.is-selected {
  outline: 2px solid #000000;
  outline-offset: 2px;
}

.color-dialog-custom {
  margin-top: 22px;
}

.color-dialog-main {
  display: grid;
  grid-template-rows: auto auto auto auto;
  align-content: start;
  gap: 10px;
}

.color-dialog-picker {
  display: grid;
  grid-template-columns: 324px 24px;
  gap: 12px;
  align-items: stretch;
}

.color-dialog-spectrum {
  position: relative;
  width: 324px;
  height: 314px;
  border: 1px solid #aeb5be;
  background:
    linear-gradient(to top, rgba(128, 128, 128, 0.82), rgba(255, 255, 255, 0)),
    linear-gradient(to right, red, yellow, lime, cyan, blue, magenta, red);
  cursor: crosshair;
}

.color-dialog-spectrum-cursor {
  position: absolute;
  left: var(--dialog-hue-position, 0%);
  top: calc(100% - var(--dialog-saturation, 0%));
  width: 12px;
  height: 12px;
  border: 2px solid #000000;
  border-radius: 50%;
  box-shadow: 0 0 0 1px #ffffff;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.color-dialog-value-slider {
  position: relative;
  width: 22px;
  height: 314px;
  border: 1px solid #aeb5be;
  background: linear-gradient(to bottom, #ffffff, #000000);
  cursor: ns-resize;
}

.color-dialog-value-cursor {
  position: absolute;
  left: 100%;
  top: calc(100% - var(--dialog-value, 0%));
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 8px solid #000000;
  transform: translate(2px, -50%);
  pointer-events: none;
}

.color-dialog-bottom {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 12px;
  align-items: start;
}

.color-dialog-preview-block {
  display: grid;
  gap: 6px;
  align-content: start;
  font-size: 14px;
}

.color-dialog-preview {
  width: 108px;
  height: 76px;
  border: 1px solid #000000;
  background: var(--swatch, #000000);
}

.color-dialog-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
}

.color-dialog-field {
  display: grid;
  grid-template-columns: 68px 50px;
  align-items: center;
  gap: 5px;
  font-size: 14px;
}

.color-dialog-field input {
  height: 28px;
  min-width: 0;
  border: 1px solid #c8ced5;
  border-radius: 2px;
  padding: 0 5px;
  background: #ffffff;
  color: #000000;
}

.color-dialog-hex-field {
  grid-column: 1 / -1;
  grid-template-columns: 68px 1fr;
}

.color-dialog-add-row {
  display: flex;
}

.color-dialog-add-row button {
  width: 100%;
  height: 34px;
  border: 1px solid #c8ced5;
  border-radius: 4px;
  background: #ffffff;
  font-size: 14px;
  cursor: pointer;
}

.color-dialog-actions {
  display: flex;
  justify-content: flex-start;
  gap: 12px;
}

.color-dialog-actions button {
  min-width: 110px;
  height: 36px;
  border: 1px solid #c8ced5;
  border-radius: 4px;
  background: #ffffff;
  cursor: pointer;
}

.color-dialog-actions button:first-child {
  border-color: #1677d2;
}

.ring-label {
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

.canvas-panel {
  grid-column: 2;
  grid-row: 2;
  position: relative;
  min-width: 0;
  min-height: 0;
  background: var(--canvas);
}

.selection-status-bar {
  grid-column: 1 / -1;
  grid-row: 3;
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 0;
  padding: 0 10px;
  background: var(--chrome);
  color: var(--ink);
  font-size: 10pt;
  user-select: none;
}

.selection-chemistry-summary {
  display: flex;
  align-items: center;
  min-width: 0;
  max-width: 100%;
  gap: 18px;
  overflow: hidden;
  white-space: nowrap;
}

.selection-chemistry-summary-item {
  display: inline-flex;
  align-items: baseline;
  min-width: 0;
  gap: 5px;
}

.selection-chemistry-summary-formula {
  flex: 0 1 auto;
  gap: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 400;
}

.selection-chemistry-summary-formula sub {
  font-size: 0.72em;
  line-height: 0;
  vertical-align: sub;
}

.selection-chemistry-summary-label {
  color: var(--muted);
}

.selection-chemistry-summary-value {
  font-variant-numeric: tabular-nums;
}

.selection-mass-precision {
  display: inline-flex;
  align-items: stretch;
  height: 18px;
  margin-left: 3px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink);
  font-size: 9pt;
  line-height: 1;
}

.selection-mass-precision-value {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  padding: 0 4px;
  font-variant-numeric: tabular-nums;
}

.selection-mass-precision-buttons {
  display: grid;
  grid-template-rows: 1fr 1fr;
  width: 14px;
  border-left: 1px solid var(--line-strong);
}

.selection-mass-precision-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.selection-mass-precision-button:hover {
  background: var(--active-soft);
  color: var(--active);
}

.selection-mass-precision-button svg {
  width: 9px;
  height: 6px;
}

.selection-mass-precision-button svg path {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.viewer-container {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: auto;
  background:
    linear-gradient(#e5e8ed 1px, transparent 1px),
    linear-gradient(90deg, #e5e8ed 1px, transparent 1px),
    var(--canvas);
  background-size: 160px 160px;
}

#viewer-svg {
  display: block;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  background: var(--canvas);
  cursor: crosshair;
}

.text-editor-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 6;
}

.canvas-context-menu {
  position: fixed;
  z-index: 80;
  min-width: 212px;
  padding: 4px;
  border: 1px solid #c9ced6;
  border-radius: 4px;
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(17, 19, 24, 0.16);
  color: #111318;
  font-size: 14px;
  user-select: none;
}

.canvas-context-menu[hidden] {
  display: none;
}

.canvas-context-menu-entry {
  position: relative;
}

.canvas-context-menu-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px;
  width: 100%;
  height: 28px;
  border: 0;
  border-radius: 2px;
  padding: 0 9px 0 6px;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: default;
}

.canvas-context-menu-item:hover,
.canvas-context-menu-item:focus-visible {
  background: #eaf2ff;
  outline: none;
}

.canvas-context-menu-item:disabled {
  color: #9aa2ad;
}

.canvas-context-menu-item:disabled:hover,
.canvas-context-menu-item:disabled:focus-visible {
  background: transparent;
}

.canvas-context-menu-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  color: #111318;
  font-size: 13px;
  line-height: 1;
}

.canvas-context-menu-label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.canvas-context-menu-shortcut {
  color: #48515d;
  padding-left: 20px;
}

.canvas-context-menu-item:disabled .canvas-context-menu-shortcut {
  color: #9aa2ad;
}

.canvas-context-menu-separator {
  height: 1px;
  margin: 4px 6px;
  background: #d9dee6;
}

.canvas-context-submenu {
  position: absolute;
  left: calc(100% - 2px);
  top: -4px;
  display: none;
  min-width: 206px;
  padding: 4px;
  border: 1px solid #c9ced6;
  border-radius: 4px;
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(17, 19, 24, 0.16);
}

.canvas-context-menu-entry.has-submenu:hover > .canvas-context-submenu,
.canvas-context-menu-entry.has-submenu:focus-within > .canvas-context-submenu {
  display: block;
}

.canvas-context-menu-entry.has-submenu > .canvas-context-menu-item:disabled + .canvas-context-submenu {
  display: none;
}

.object-settings-dialog[hidden] {
  display: none;
}

.object-settings-dialog {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  color: #111318;
  font-size: 14px;
}

.object-settings-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 19, 24, 0.18);
}

.object-settings-panel {
  position: relative;
  z-index: 3;
  width: min(460px, calc(100vw - 32px));
  padding: 14px;
  border: 1px solid #c9ced6;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 16px 42px rgba(17, 19, 24, 0.2);
}

.object-settings-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 12px;
}

.object-settings-title {
  font-size: 15px;
  font-weight: 700;
}

.object-settings-unit {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #48515d;
}

.object-settings-unit select {
  height: 26px;
  min-width: 62px;
  border: 1px solid #b9c1cc;
  border-radius: 3px;
  background: #ffffff;
}

.object-settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 14px;
}

.object-settings-grid label {
  display: grid;
  grid-template-columns: minmax(96px, 1fr) 82px 24px;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.object-settings-grid span {
  min-width: 0;
  white-space: nowrap;
}

.object-settings-grid input {
  width: 82px;
  height: 28px;
  padding: 2px 5px;
  border: 1px solid #b9c1cc;
  border-radius: 2px;
}

.object-settings-grid input.is-invalid {
  border-color: #b44747;
  box-shadow: 0 0 0 2px rgba(180, 71, 71, 0.16);
}

.object-settings-grid em {
  color: #5d6672;
  font-style: normal;
}

.object-settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.object-settings-actions button {
  min-width: 72px;
  height: 30px;
  border: 1px solid #aeb7c2;
  border-radius: 3px;
  background: #f5f6f8;
}

.object-settings-actions button[type="submit"] {
  border-color: #245ed0;
  background: #2f6fed;
  color: #ffffff;
}

.numeric-dialog {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  color: #111318;
  font-size: 14px;
}

.numeric-dialog-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 19, 24, 0.18);
}

.numeric-dialog-panel {
  position: relative;
  z-index: 3;
  width: min(320px, calc(100vw - 32px));
  padding: 14px;
  border: 1px solid #c9ced6;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 16px 42px rgba(17, 19, 24, 0.2);
}

.numeric-dialog-title {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 700;
}

.numeric-dialog-field {
  display: grid;
  grid-template-columns: minmax(90px, 1fr) 96px auto;
  align-items: center;
  gap: 8px;
}

.numeric-dialog-field input {
  width: 96px;
  height: 28px;
  padding: 2px 5px;
  border: 1px solid #b9c1cc;
  border-radius: 2px;
}

.numeric-dialog-field input.is-invalid {
  border-color: #b44747;
  box-shadow: 0 0 0 2px rgba(180, 71, 71, 0.16);
}

.numeric-dialog-field em {
  color: #5d6672;
  font-style: normal;
}

.numeric-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.numeric-dialog-actions button {
  min-width: 72px;
  height: 30px;
  border: 1px solid #aeb7c2;
  border-radius: 3px;
  background: #f5f6f8;
}

.numeric-dialog-actions button[type="submit"] {
  border-color: #245ed0;
  background: #2f6fed;
  color: #ffffff;
}

.unsaved-changes-dialog {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  color: #111318;
  font-size: 14px;
}

.unsaved-changes-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 19, 24, 0.22);
}

.unsaved-changes-panel {
  position: relative;
  z-index: 3;
  width: min(420px, calc(100vw - 32px));
  padding: 16px;
  border: 1px solid #c9ced6;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 16px 42px rgba(17, 19, 24, 0.22);
}

.unsaved-changes-title {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.25;
}

.unsaved-changes-message {
  margin: 0;
  color: #384250;
  line-height: 1.45;
}

.unsaved-changes-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

.unsaved-changes-actions button {
  min-width: 86px;
  height: 31px;
  padding: 0 12px;
  border: 1px solid #aeb7c2;
  border-radius: 3px;
  background: #f5f6f8;
  color: #111318;
}

.unsaved-changes-actions button:focus-visible {
  outline: 2px solid rgba(47, 111, 237, 0.45);
  outline-offset: 2px;
}

.unsaved-changes-actions button.is-primary {
  border-color: #245ed0;
  background: #2f6fed;
  color: #ffffff;
}

.repeat-unit-ungroup-dialog {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  color: #111318;
  font-size: 14px;
}

.repeat-unit-ungroup-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 19, 24, 0.22);
}

.repeat-unit-ungroup-panel {
  position: relative;
  z-index: 3;
  width: min(460px, calc(100vw - 32px));
  padding: 16px;
  border: 1px solid #c9ced6;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 16px 42px rgba(17, 19, 24, 0.22);
}

.repeat-unit-ungroup-title {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.25;
}

.repeat-unit-ungroup-message {
  margin: 0;
  color: #384250;
  line-height: 1.45;
}

.repeat-unit-ungroup-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
}

.repeat-unit-ungroup-remember {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #384250;
  line-height: 1.2;
  user-select: none;
}

.repeat-unit-ungroup-remember input {
  width: 14px;
  height: 14px;
  margin: 0;
}

.repeat-unit-ungroup-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.repeat-unit-ungroup-actions button {
  min-width: 86px;
  height: 31px;
  padding: 0 12px;
  border: 1px solid #aeb7c2;
  border-radius: 3px;
  background: #f5f6f8;
  color: #111318;
}

.repeat-unit-ungroup-actions button:focus-visible,
.repeat-unit-ungroup-remember input:focus-visible {
  outline: 2px solid rgba(47, 111, 237, 0.45);
  outline-offset: 2px;
}

.repeat-unit-ungroup-actions button.is-primary {
  border-color: #245ed0;
  background: #2f6fed;
  color: #ffffff;
}

.text-editor {
  position: absolute;
  display: inline-block;
  min-width: 8px;
  padding: 0;
  border: 0;
  outline: none;
  background: #ffffff;
  color: #000000;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
  overflow: visible;
  pointer-events: auto;
  box-shadow: inset 0 0 0 0.5px rgba(17, 19, 24, 0.62);
  transform-origin: 0 0;
  user-select: none;
  cursor: text;
}

.text-editor-display {
  position: relative;
  white-space: pre;
  min-width: inherit;
  min-height: inherit;
  cursor: text;
}

.text-editor-svg {
  display: block;
  overflow: visible;
  cursor: text;
}

.text-editor-selection-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.text-editor-selection-segment {
  position: absolute;
  background: rgba(47, 111, 237, 0.28);
}

.text-editor-run {
  display: inline;
}

.text-editor-run.is-selected {
  background: rgba(47, 111, 237, 0.28);
}

.text-editor-caret {
  position: absolute;
  width: 1px;
  background: #111318;
  pointer-events: none;
}

.text-editor-input {
  position: absolute;
  width: 1px;
  min-width: 1px;
  height: 1em;
  border: 0;
  padding: 0;
  margin: 0;
  opacity: 0;
  resize: none;
  overflow: hidden;
  background: transparent;
  color: transparent;
  caret-color: transparent;
  outline: none;
  pointer-events: none;
}

.text-editor-marker {
  display: inline-block;
  width: 0;
  overflow: hidden;
}

.text-symbol-palette {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 12;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  pointer-events: none;
}

.text-symbol-toggle,
.text-symbol-pin,
.text-symbol-cell {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  pointer-events: auto;
}

.text-symbol-toggle {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  box-shadow: 0 3px 10px rgba(17, 19, 24, 0.14);
}

.text-symbol-toggle:hover,
.text-symbol-pin:hover,
.text-symbol-cell:hover {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.text-symbol-toggle svg {
  width: 22px;
  height: 22px;
}

.text-symbol-panel {
  width: min(410px, calc(100vw - 92px));
  max-width: calc(100vw - 8px);
  max-height: min(320px, calc(100vh - 150px));
  display: none;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: 0 8px 26px rgba(17, 19, 24, 0.18);
  pointer-events: auto;
}

.text-symbol-palette.is-open .text-symbol-panel {
  display: flex;
}

.text-symbol-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 26px;
  gap: 10px;
  padding: 2px 7px;
  border-bottom: 1px solid var(--line);
  background: var(--chrome);
}

.text-symbol-title {
  font-size: 8pt;
  font-weight: 700;
}

.text-symbol-pin {
  width: 22px;
  height: 22px;
  border-radius: 5px;
}

.text-symbol-pin svg {
  width: 16px;
  height: 16px;
}

.text-symbol-pin svg path {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--cc-icon-stroke-thin);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.text-symbol-pin.is-selected {
  border-color: #8fb0f4;
  background: var(--active-soft);
  color: var(--active);
}

.text-symbol-content {
  overflow: auto;
  overflow-x: hidden;
  padding: 12px 10px 12px 18px;
}

.text-symbol-section {
  margin: 0 0 6px;
}

.text-symbol-section:last-child {
  margin-bottom: 0;
}

.text-symbol-section-label {
  margin: 0 0 2px 2px;
  color: var(--muted);
  font-size: 8pt;
  font-weight: 700;
}

.text-symbol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 20px);
  grid-auto-rows: 20px;
  gap: 2px;
}

.text-symbol-cell {
  height: 20px;
  min-width: 20px;
  border-radius: 4px;
  padding: 0;
  font-family: Arial, "Helvetica Neue", Helvetica, "Droid Sans Fallback", sans-serif;
  font-size: 8pt;
  line-height: 1;
}

.chem-text {
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  fill: #000000;
}

.mol-bond-stroked {
  stroke-linecap: butt;
  stroke-linejoin: miter;
}

.mol-bond-filled {
  stroke: none;
  stroke-width: 0;
}

.mol-atom-label {
  paint-order: normal;
  stroke: none;
  stroke-width: 0;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.mol-group-label {
  font-style: italic;
}

.label-knockout-shape {
  stroke: none;
}

.document-diagnostic-marker {
  pointer-events: none;
}

.editor-endpoint-halo {
  fill: rgba(47, 111, 237, 0.24);
  stroke: rgba(47, 111, 237, 0.78);
  stroke-width: 1.4px;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 4px rgba(47, 111, 237, 0.55));
}

.editor-bond-center-halo {
  fill: rgba(47, 111, 237, 0.18);
  stroke: rgba(47, 111, 237, 0.82);
  stroke-width: 1.4px;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 4px rgba(47, 111, 237, 0.45));
}

.editor-arrow-center-halo {
  fill: rgba(47, 111, 237, 0.18);
  stroke: rgba(47, 111, 237, 0.76);
  stroke-width: 1.2px;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 4px rgba(47, 111, 237, 0.35));
}

.editor-arrow-focus-handle,
.editor-object-control-handle {
  fill: none;
  stroke: rgba(47, 111, 237, 0.86);
  stroke-width: 1.1px;
  vector-effect: non-scaling-stroke;
}

.editor-bond-center-rect {
  fill: rgba(47, 111, 237, 0.11);
  stroke: rgba(47, 111, 237, 0.72);
  stroke-width: 1.2px;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 4px rgba(47, 111, 237, 0.35));
}

.editor-text-box-focus {
  fill: rgba(47, 111, 237, 0.12);
  stroke: rgba(47, 111, 237, 0.76);
  stroke-width: 1.1px;
  vector-effect: non-scaling-stroke;
}

.editor-label-glyph-focus {
  fill: rgba(47, 111, 237, 0.12);
  stroke: rgba(47, 111, 237, 0.82);
  stroke-width: 1.1px;
  vector-effect: non-scaling-stroke;
}

.editor-selection-bond {
  stroke: rgba(47, 111, 237, 0.72);
  stroke-linecap: round;
}

.editor-selection-box,
.editor-selection-bond-box,
.editor-selection-node-box,
.editor-selection-text-box {
  fill: none;
  stroke: rgba(47, 111, 237, 0.86);
  vector-effect: non-scaling-stroke;
}

.editor-selection-box,
.editor-selection-bond-box,
.editor-selection-node-box,
.editor-selection-text-box {
  stroke-width: 1.2px;
}

.editor-selection-bond-dot {
  fill: rgba(47, 111, 237, 0.92);
  stroke: none;
  stroke-width: 0;
  vector-effect: non-scaling-stroke;
}

.editor-selection-rotate-stem,
.editor-selection-rotate-glyph {
  fill: none;
  stroke: rgba(47, 111, 237, 0.9);
  stroke-width: 1.2px;
  vector-effect: non-scaling-stroke;
}

.editor-selection-center-cross {
  fill: none;
  stroke: rgba(47, 111, 237, 0.9);
  stroke-width: 1.2px;
  vector-effect: non-scaling-stroke;
}

.editor-selection-rotate-handle {
  fill: #ffffff;
  stroke: rgba(47, 111, 237, 0.9);
  stroke-width: 1.4px;
  vector-effect: non-scaling-stroke;
}

.editor-selection-top-handle {
  fill: #ffffff;
  stroke: rgba(47, 111, 237, 0.9);
  stroke-width: 1.2px;
  vector-effect: non-scaling-stroke;
}

.editor-selection-resize-handle {
  fill: rgba(47, 111, 237, 0.92);
  stroke: none;
  stroke-width: 0;
  vector-effect: non-scaling-stroke;
}

.editor-selection-rotate-angle {
  fill: rgba(17, 19, 24, 0.8);
  font-size: 12px;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  dominant-baseline: text-after-edge;
}

.tlc-spot-rf-box {
  fill: #ffffff;
  stroke: none;
}

.tlc-spot-rf-label {
  fill: rgba(17, 19, 24, 0.86);
  font-size: 6pt;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  dominant-baseline: text-after-edge;
}

.tlc-spot-rf-subscript {
  baseline-shift: sub;
  font-size: 70%;
}

.editor-selection-resize-label {
  fill: rgba(17, 19, 24, 0.86);
  font-size: 12px;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  dominant-baseline: text-after-edge;
}

.editor-selection-marquee,
.editor-selection-lasso {
  fill: rgba(47, 111, 237, 0.06);
  stroke: rgba(47, 111, 237, 0.82);
  stroke-width: 1.1px;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 4 3;
}

.editor-selection-lasso {
  fill: none;
}

.editor-preview-end {
  fill: rgba(47, 111, 237, 0.16);
  stroke: rgba(47, 111, 237, 0.5);
  stroke-width: 0.8px;
  vector-effect: non-scaling-stroke;
}

/* Legacy label-debug page support. */
.app-shell {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 100vh;
}

.sidebar {
  overflow: auto;
  border-right: 1px solid var(--line);
  background: var(--chrome);
  padding: 18px;
}

.sidebar-block + .sidebar-block {
  margin-top: 18px;
}

.sidebar h1,
.sidebar h2 {
  margin: 0 0 8px;
}

.sidebar label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
}

.sidebar select,
.sidebar button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  padding: 8px 10px;
}

.sidebar button + button {
  margin-top: 8px;
}

.view-links {
  display: flex;
  gap: 8px;
}

.view-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
}

.view-link.is-active {
  border-color: var(--active);
  background: var(--active-soft);
}

.muted {
  color: var(--muted);
}

.meta {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  white-space: pre-wrap;
  font-size: 12px;
  line-height: 1.45;
}

.viewer-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.viewer-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 12px 16px;
  background: var(--chrome);
}

body[data-view-mode="label-debug"] {
  background: #000000;
  color: #f0f0f0;
}

body[data-view-mode="label-debug"] .sidebar,
body[data-view-mode="label-debug"] .viewer-toolbar {
  background: #0c0c0c;
  border-color: #2e2e2e;
}

body[data-view-mode="label-debug"] .viewer-container,
body[data-view-mode="label-debug"] #viewer-svg {
  background: #000000;
}

body[data-view-mode="label-debug"] .mol-atom-label,
body[data-view-mode="label-debug"] .mol-group-label {
  fill: #000000;
  stroke: none;
}

body[data-view-mode="label-debug"] .label-knockout-shape {
  fill: #ffffff;
  stroke: none;
}