html, body {
  color: #333;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
  font-family: Helvetica, arial, freesans, clean, sans-serif;
  font-size: 1em;
  line-height: 1.5em;
  background-color: #fff;
  overscroll-behavior-y: none;
}

body {
  display: flex;
  flex-direction: column;
  height:100vh;
}

h1, h2, h3, h4, h5, h6, p {
  font-size: 1em;
  margin: 0;
  padding: 0;
  font-weight: normal;
}

p {
  margin: 1em;
}

a:link,
a:visited,
a:hover
a:active {
  text-decoration: none;
}

img {
  border: none;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  width: 100%;
  background-color: #444;
  font-size: 12px;
  color: #fff;
}

header a:link, header a:hover, header a:visited, header a:active {
  color: #fff;
}

header a:hover {
  text-decoration: underline;
}

#menu-items {
    display: flex;
}

#reset-button {
    margin-left: 16px;
}

#copy-button {
    margin-left: 16px;
}

#export-button {
    margin-left: 16px;
}

#sync-button {
    margin-left: 16px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

header input[type="checkbox"] {
    vertical-align: middle;
    margin-right: 4px;
    margin-top: 0px;
}

#github {
    padding-right: 32px;
}

#github img {
  display: block;
  width: 16px;
}

#github a {
  display: block;
  width: 16px;
}

footer {
  padding: 8px;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: #fff;
  color: #fff;
  text-align: center;
  justify-content: center;
  align-items: center;
}

#container {
  flex-grow: 1;
  overflow: hidden;
  width: 100%;
  margin: 0 auto;
  background-color: #fff;
  border-bottom: 1px solid #e8e8e8;
  display: flex;
}

#editor-wrapper {
  height: 100%;
}

#editor {
  height: 100%;
}

#preview-wrapper {
  padding: 8px 16px 16px 16px;
}

.column {
  width: 50%;
  padding: 0;
  margin: 0;
  white-space: nowrap;
  vertical-align: top;
}

#preview.column {
  overflow-y: scroll;
  white-space: normal;
}

.markdown-body .mermaid {
  overflow-x: auto;
  padding: 16px;
  text-align: center;
}

.markdown-body .mermaid svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.markdown-body .mermaid-error {
  color: #cf222e;
  white-space: pre-wrap;
  text-align: left;
}

[data-theme="dark"] .markdown-body .mermaid-error {
  color: #ff7b72;
}

.split-container {
  display: flex;
  height: 100%;
  width: 100%;
}

.editor-pane,
.preview-pane {
  height: 100%;
}

.split-divider {
  width: 5px;
  background: #ccc;
  cursor: col-resize;
  z-index: 1;
}

.split-divider.hover {
  background: #999;
}

.split-divider.active {
  background: #666;
}

.split-divider-vertical {
  width: 2px;
  background: #e0e0e0;
  cursor: default;
  flex-shrink: 0;
}

/* ----- Sidebar ----- */

.sidebar-pane {
  width: 250px;
  min-width: 250px;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #f6f8fa;
  border-right: 1px solid #d0d7de;
}

#sidebar-toolbar {
  display: flex;
  gap: 4px;
  padding: 8px;
  border-bottom: 1px solid #d0d7de;
  flex-shrink: 0;
}

.sidebar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  background: #fff;
  color: #57606a;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.sidebar-btn:hover {
  background: #eaeef2;
  color: #24292f;
}

.sidebar-btn svg {
  width: 16px;
  height: 16px;
}

#sidebar-tree {
  flex-grow: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 4px 0;
  user-select: none;
}

/* ----- Tree nodes ----- */

.sidebar-tree__list {
  list-style: none;
  margin: 0;
  padding: 0;
  padding-left: 16px;
}

.sidebar-tree__list[data-parent-id=""] {
  padding-left: 4px;
}

.sidebar-tree__item {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-tree__row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  cursor: pointer;
  border-radius: 6px;
  margin: 1px 4px;
  transition: background 0.1s;
}

.sidebar-tree__row:hover {
  background: #eaeef2;
}

.sidebar-tree__item--active > .sidebar-tree__row {
  background: #ddf4ff;
}

.sidebar-tree__item--active > .sidebar-tree__row:hover {
  background: #c7edff;
}

.sidebar-tree__icon-wrap {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.sidebar-tree__icon {
  width: 16px;
  height: 16px;
  color: #57606a;
  flex-shrink: 0;
}


.sidebar-tree__name {
  font-size: 13px;
  line-height: 1.4;
  color: #24292f;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-tree__rename-input {
  font-size: 13px;
  line-height: 1.4;
  padding: 1px 4px;
  border: 2px solid #0969da;
  border-radius: 4px;
  outline: none;
  background: #fff;
  color: #24292f;
  width: 100%;
  min-width: 0;
}

/* SortableJS drag states */

.sidebar-tree__item.sortable-ghost {
  opacity: 0.4;
}

.sidebar-tree__item.sortable-chosen {
  opacity: 0.7;
  background: #fff8c5;
}

.sidebar-tree__item.sortable-drag {
  opacity: 0.8;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  border-radius: 6px;
}

/* ----- Dark theme overrides ----- */

[data-theme="dark"] html, [data-theme="dark"] body {
  background-color: #212830;
  color: #e6edf3;
}

[data-theme="dark"] header {
  background-color: #333;
  color: #e6edf3;
}

[data-theme="dark"] header a:link, [data-theme="dark"] header a:hover, [data-theme="dark"] header a:visited {
  color: #e6edf3;
}

[data-theme="dark"] #container {
  background-color: #212830;
  border-bottom: 1px solid #1f2d3a;
}

[data-theme="dark"] .split-divider {
  background: #30363d;
}

[data-theme="dark"] .split-divider.hover {
  background: #444c56;
}

[data-theme="dark"] .split-divider.active {
  background: #768390;
}

[data-theme="dark"] .split-divider-vertical {
  background: #30363d;
}

[data-theme="dark"] footer {
  background-color: #333;
}

[data-theme="dark"] .sidebar-pane {
  background: #1c2128;
  border-right-color: #30363d;
}

[data-theme="dark"] #sidebar-toolbar {
  border-bottom-color: #30363d;
}

[data-theme="dark"] .sidebar-btn {
  background: #1c2128;
  border-color: #30363d;
  color: #768390;
}

[data-theme="dark"] .sidebar-btn:hover {
  background: #30363d;
  color: #e6edf3;
}

[data-theme="dark"] .sidebar-tree__row:hover {
  background: #2d333b;
}

[data-theme="dark"] .sidebar-tree__item--active > .sidebar-tree__row {
  background: #1b3a5c;
}

[data-theme="dark"] .sidebar-tree__item--active > .sidebar-tree__row:hover {
  background: #1f4a78;
}

[data-theme="dark"] .sidebar-tree__name {
  color: #e6edf3;
}

[data-theme="dark"] .sidebar-tree__icon {
  color: #768390;
}

[data-theme="dark"] .sidebar-tree__rename-input {
  background: #1c2128;
  color: #e6edf3;
  border-color: #539bf5;
}

[data-theme="dark"] .sidebar-tree__item.sortable-chosen {
  background: #2d333b;
}

[data-theme="dark"] .sidebar-tree__item.sortable-drag {
  background: #2d333b;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

/* ----- Context menu ----- */

.ctx-menu {
  position: fixed;
  z-index: 9999;
  min-width: 180px;
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(140,149,159,0.2);
  padding: 4px 0;
}

.ctx-menu__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  cursor: pointer;
  transition: background 0.1s;
}

.ctx-menu__item:hover {
  background: #f3f4f6;
}

.ctx-menu__item--disabled {
  opacity: 0.4;
  cursor: default;
}

.ctx-menu__item--disabled:hover {
  background: transparent;
}

.ctx-menu__item--danger {
  color: #cf222e;
}

.ctx-menu__item--danger:hover {
  background: #fff1f0;
}

.ctx-menu__item-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: #57606a;
}

.ctx-menu__item--danger .ctx-menu__item-icon {
  color: #cf222e;
}

.ctx-menu__item-label {
  font-size: 13px;
  line-height: 1.4;
  color: #24292f;
  white-space: nowrap;
}

.ctx-menu__item--danger .ctx-menu__item-label {
  color: #cf222e;
}

/* Dark theme */
.ctx-menu--dark {
  background: #2d333b;
  border-color: #444c56;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.ctx-menu--dark .ctx-menu__item:hover {
  background: #373e47;
}

.ctx-menu--dark .ctx-menu__item--danger:hover {
  background: #3d282b;
}

.ctx-menu--dark .ctx-menu__item-icon {
  color: #768390;
}

.ctx-menu--dark .ctx-menu__item-label {
  color: #e6edf3;
}

.ctx-menu--dark .ctx-menu__item--danger .ctx-menu__item-icon,
.ctx-menu--dark .ctx-menu__item--danger .ctx-menu__item-label {
  color: #ff7b72;
}