:root {
  color-scheme: light;
  --bg: #f9fafb;
  --bg-muted: #f8fafc;
  --ink: #1f2937;
  --muted: #6b7280;
  --stroke: rgba(15, 23, 42, 0.06);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --shadow: 0 12px 24px rgba(15, 23, 42, 0.06);
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto,
    sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype",
    serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --reader-font-family: var(--font-sans);
  --reader-width: 760px;
  --reader-font-size: 17px;
  --line-height: 1.7;
  --radius: 12px;
  --content-h1-size: 2.5rem;
  --content-h2-size: 2rem;
  --content-h3-size: 1.25rem;
  --content-h4-size: 1.1rem;
  --content-heading-top: 32px;
  --content-heading-bottom: 16px;
  --content-paragraph-gap: 18px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0f19;
  --bg-muted: #111827;
  --ink: #e5e7eb;
  --muted: #9ca3af;
  --stroke: rgba(255, 255, 255, 0.08);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --shadow: none;
}

:root[data-theme="sepia"] {
  color-scheme: light;
  --bg: #f6f4ef;
  --bg-muted: #ffffff;
  --ink: #2b2a26;
  --muted: #6b6560;
  --stroke: rgba(43, 42, 38, 0.08);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --shadow: none;
}

:root[data-preset="docs"] {
  --line-height: 1.65;
  --content-h1-size: 2.4rem;
  --content-h2-size: 1.9rem;
  --content-h3-size: 1.2rem;
  --content-h4-size: 1.05rem;
  --content-heading-top: 30px;
  --content-heading-bottom: 14px;
}

:root[data-preset="github"] {
  --line-height: 1.55;
  --content-h1-size: 2.1rem;
  --content-h2-size: 1.6rem;
  --content-h3-size: 1.1rem;
  --content-h4-size: 1rem;
  --content-heading-top: 24px;
  --content-heading-bottom: 12px;
  --content-paragraph-gap: 14px;
}

:root[data-preset="blog"] {
  --line-height: 1.75;
  --content-h1-size: 2.8rem;
  --content-h2-size: 2.2rem;
  --content-h3-size: 1.35rem;
  --content-h4-size: 1.15rem;
  --content-heading-top: 36px;
  --content-heading-bottom: 18px;
  --content-paragraph-gap: 18px;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 32px;
  background: var(--bg);
  border-bottom: 1px solid var(--stroke);
  box-shadow: none;
  transition: opacity 140ms ease-out;
}

.topbar__left,
.topbar__right {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}


.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.brand:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.4);
  outline-offset: 4px;
  border-radius: 10px;
}

.brand:hover .brand__mark {
  background: rgba(37, 99, 235, 0.08);
}

.brand:hover .brand__title {
  color: var(--accent);
}

.brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 500;
  color: var(--accent);
  background: var(--bg-muted);
  letter-spacing: 0.04em;
}

.brand__title {
  font-size: 16px;
  font-weight: 500;
}

.brand__subtitle {
  font-size: 13px;
  color: var(--muted);
}


.menu-bar {
  display: flex;
  gap: 12px;
  align-items: center;
}

.menu {
  position: relative;
}

.menu > summary {
  list-style: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  padding: 6px 8px;
  border-radius: 6px;
}

.menu > summary:hover {
  color: var(--ink);
  background: var(--bg-muted);
}

.menu > summary::-webkit-details-marker {
  display: none;
}

.menu > summary::marker {
  content: "";
}

.menu[open] > summary {
  color: var(--ink);
  background: var(--bg-muted);
}

.menu__panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  background: var(--bg);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  padding: 8px;
  box-shadow: var(--shadow);
  z-index: 20;
  max-height: min(70vh, 520px);
  overflow-y: auto;
}

.menu__panel--right {
  left: auto;
  right: 0;
}

.menu__panel--wide {
  min-width: 260px;
}

.menu__item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}

.menu__item kbd {
  margin-left: auto;
}

.menu__item:hover {
  background: var(--bg-muted);
}

.menu__item.is-active {
  background: var(--bg-muted);
  color: var(--ink);
}

.menu__item[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.menu__separator {
  height: 1px;
  border: 0;
  background: var(--stroke);
  margin: 6px 0;
}

.menu__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 6px 8px 4px;
}

.menu__row {
  display: flex;
  gap: 8px;
  padding: 0 8px 8px;
}

.menu__choice {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--bg-muted);
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
}

.menu__choice:hover {
  color: var(--ink);
}

.menu__choice.is-active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
}

.menu__field {
  display: grid;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  padding: 8px;
}

.menu__field input,
.menu__field select {
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  background: var(--bg);
  color: var(--ink);
}

.menu__field.range span {
  font-size: 12px;
  color: var(--muted);
}

.menu__check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  color: var(--muted);
}

.menu__check input {
  accent-color: var(--accent);
}

.menu--button > summary {
  height: 34px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
}

.menu--button > summary.primary {
  background: var(--accent);
  color: #ffffff;
}

.menu--button[open] > summary {
  background: rgba(15, 23, 42, 0.04);
  color: var(--ink);
}

.menu--button[open] > summary.primary {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #ffffff;
}

.menu--compact > summary {
  height: 28px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 12px;
  color: var(--muted);
}


button {
  font-family: inherit;
  font-size: 14px;
}

button.ghost,
button.primary,
button.small,
button.link {
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: background-color 140ms ease-out, border-color 140ms ease-out,
    color 140ms ease-out;
}

button.primary {
  height: 34px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 500;
}

button.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

button.ghost {
  height: 34px;
  padding: 0 10px;
  border-radius: 8px;
  border-color: transparent;
  color: var(--muted);
}

button.ghost:hover {
  background: rgba(15, 23, 42, 0.04);
  color: var(--ink);
}

button.small {
  height: 28px;
  padding: 0 10px;
  border-radius: 8px;
  border-color: transparent;
  font-size: 12px;
  color: var(--muted);
}

button.small:hover {
  background: rgba(15, 23, 42, 0.04);
  color: var(--ink);
}

button.link {
  border: none;
  height: auto;
  padding: 0;
  font-size: 12px;
  color: var(--accent);
}

button.icon-button {
  width: 34px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button.icon-button--shortcut {
  width: auto;
  padding: 0 8px;
  gap: 6px;
}

button.icon-button svg {
  display: block;
}

kbd {
  font-size: 12px;
  border-radius: 6px;
  padding: 2px 6px;
  border: 1px solid transparent;
  background: var(--bg-muted);
  color: var(--muted);
  font-family: inherit;
}

kbd.shortcut-hint {
  font-size: 11px;
  padding: 1px 5px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(15, 23, 42, 0.04);
  color: var(--muted);
}

.toast {
  position: fixed;
  top: 80px;
  right: 32px;
  z-index: 20;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  background: var(--bg);
  box-shadow: var(--shadow);
  font-size: 13px;
  color: var(--ink);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 140ms ease-out, transform 140ms ease-out;
  pointer-events: none;
}

.toast.toast--show {
  opacity: 1;
  transform: translateY(0);
}

.toast[data-tone="warn"] {
  color: var(--accent-strong);
}

.workspace {
  position: relative;
  z-index: 1;
  max-width: 1240px;
  margin: 0 auto;
  padding: 72px 32px 120px;
}

.empty-state {
  display: grid;
  gap: 28px;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  min-height: calc(100vh - 240px);
  place-content: center;
}

.empty-state h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1.2;
  font-weight: 500;
  font-family: var(--font-serif);
  letter-spacing: -0.01em;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.dropzone {
  display: grid;
  gap: 16px;
  padding: 64px 40px;
  border-radius: var(--radius);
  background: var(--bg-muted);
  transition: background-color 140ms ease-out;
}

.dropzone.dragging {
  background: rgba(37, 99, 235, 0.08);
}

.empty-state__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hint {
  font-size: 13px;
  color: var(--muted);
}

.recent {
  text-align: left;
  padding-top: 4px;
}

.recent__title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
}

.recent__list {
  display: grid;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.recent__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--bg-muted);
  font-size: 14px;
  color: var(--ink);
  width: 100%;
}

.recent__meta {
  font-size: 12px;
  color: var(--muted);
}

.recent__empty {
  font-size: 13px;
  color: var(--muted);
}

.workspace__panes {
  display: flex;
  gap: 24px;
  align-items: stretch;
}

.pane {
  border: none;
  border-radius: var(--radius);
  background: transparent;
  min-width: 0;
}

.editor-pane {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 60vh;
}

.editor-toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 12px 12px 0;
  flex-wrap: wrap;
}

.editor-pane textarea {
  flex: 1;
  min-height: 60vh;
  border: none;
  background: transparent;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  resize: vertical;
  outline: none;
}

.viewer-pane {
  flex: 1 1 0;
  background: var(--bg);
}

.toc-panel {
  flex: 0 0 220px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--bg-muted);
  padding: 16px;
  height: fit-content;
  position: sticky;
  top: 96px;
  max-width: 220px;
  max-height: calc(100vh - 140px);
  overflow: auto;
  transition: opacity 140ms ease-out, transform 140ms ease-out,
    max-width 140ms ease-out;
}

.settings-panel {
  flex: 0 0 220px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--bg-muted);
  padding: 16px;
  height: fit-content;
  position: sticky;
  top: 96px;
  max-width: 220px;
  display: grid;
  gap: 12px;
}

.settings__title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.settings__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.settings__text {
  font-size: 13px;
  color: var(--muted);
}

.settings__toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.settings__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.settings__divider {
  height: 1px;
  background: var(--stroke);
  margin: 6px 0;
}

.settings-panel .menu__row {
  padding: 0;
}

.toc__title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
}

.toc__list {
  display: grid;
  gap: 8px;
  font-size: 13px;
}

.toc__link {
  color: var(--muted);
  text-decoration: none;
}

.toc__link:hover {
  color: var(--ink);
}

.toc__link--h2 {
  margin-left: 12px;
}

.toc__link--h3 {
  margin-left: 20px;
}

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

body:not(.has-document) .workspace__panes {
  display: none;
}

body.has-document .empty-state {
  display: none;
}

body:not(.has-document) .topbar {
  display: none;
}

body[data-view="preview"] .editor-pane {
  display: none;
}

body[data-view="edit"] .viewer-pane {
  display: none;
}

body[data-view="preview"] #insertMenu {
  display: none;
}

body:not(.toc-open) .toc-panel {
  opacity: 0;
  transform: translateX(-8px);
  max-width: 0;
  flex: 0 0 0;
  padding: 0;
  border: 0;
  overflow: hidden;
  pointer-events: none;
  visibility: hidden;
}

body.focus .topbar {
  opacity: 0.6;
}

body.focus .toc-panel,
body.focus .editor-pane {
  display: none;
}

body.focus .settings-panel {
  display: none;
}

body.focus .viewer-footer {
  display: none !important;
}

body.zen .topbar {
  display: none;
}

body.zen .workspace {
  padding-top: 32px;
}

.content,
.raw {
  padding: 32px;
}

.content {
  font-family: var(--reader-font-family);
  font-size: var(--reader-font-size);
  line-height: var(--line-height);
  max-width: var(--reader-width);
  margin: 0 auto;
  color: var(--ink);
}

.content img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--stroke);
}

.content pre {
  background: var(--bg-muted);
  padding: 16px;
  border-radius: 8px;
  overflow: auto;
  border: 1px solid var(--stroke);
  font-family: var(--font-mono);
  font-size: 14px;
}

.content pre code.hljs {
  display: block;
  color: var(--ink);
}

.content code {
  font-family: var(--font-mono);
  background: var(--bg-muted);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid var(--stroke);
  font-size: 0.9em;
}

.content pre code {
  background: transparent;
  padding: 0;
  border: 0;
}

.hljs-comment,
.hljs-quote {
  color: var(--muted);
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-attr,
.hljs-attribute {
  color: var(--accent);
}

.hljs-string,
.hljs-doctag,
.hljs-title,
.hljs-number,
.hljs-variable,
.hljs-template-variable,
.hljs-function {
  color: var(--ink);
}

.content .mermaid {
  background: var(--bg-muted);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  overflow: auto;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 var(--content-paragraph-gap);
  font-size: 0.95em;
}

.content th,
.content td {
  border: 1px solid var(--stroke);
  padding: 10px 12px;
  text-align: left;
}

.content blockquote {
  border-left: 3px solid var(--stroke);
  margin: 0 0 var(--content-paragraph-gap);
  padding-left: 16px;
  color: var(--muted);
}

.content h1,
.content h2,
.content h3,
.content h4 {
  font-weight: 500;
  margin-top: var(--content-heading-top);
  margin-bottom: var(--content-heading-bottom);
}

.content h1 {
  font-size: var(--content-h1-size);
  line-height: 1.2;
}

.content h2 {
  font-size: var(--content-h2-size);
  line-height: 1.25;
}

.content h3 {
  font-size: var(--content-h3-size);
  line-height: 1.4;
}

.content h4 {
  font-size: var(--content-h4-size);
  line-height: 1.4;
}

.content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.content p,
.content ul,
.content ol,
.content pre,
.content table,
.content blockquote {
  margin: 0 0 var(--content-paragraph-gap);
}

.content > :last-child {
  margin-bottom: 0;
}

.content ul {
  padding-left: 22px;
}

.content .task-list-item {
  list-style: none;
  margin-left: -22px;
}

.content .task-list-item input {
  margin-right: 8px;
}

.raw {
  display: none;
  font-family: var(--font-mono);
  font-size: 14px;
  white-space: pre-wrap;
  background: #0f172a;
  color: #f8fafc;
  min-height: 260px;
}

.meta {
  border-bottom: 1px solid var(--stroke);
  padding: 16px 24px;
  background: var(--bg-muted);
}

.meta__title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
}

.meta__grid {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--ink);
}

.meta__row {
  display: block;
}

.meta__grid dt {
  color: var(--muted);
  margin: 0;
  display: inline;
}

.meta__grid dt::after {
  content: ":";
  margin-right: 4px;
}

.meta__grid dd {
  margin: 0;
  display: inline;
}

.viewer-footer {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 12px 16px;
  border-top: 1px solid var(--stroke);
  font-size: 12px;
  color: var(--muted);
}

.viewer-footer__action {
  width: 26px;
  height: 26px;
  padding: 0;
  border-radius: 6px;
}

.viewer-footer .link {
  margin-left: auto;
}

@media print {
  body {
    background: #ffffff;
  }

  .topbar,
  .settings-panel,
  .toc-panel,
  .viewer-footer,
  .empty-state,
  .toast,
  .menu__panel,
  .menu__panel--right,
  .editor-pane {
    display: none !important;
  }

  .workspace,
  .workspace__panes,
  .viewer-pane,
  .content,
  .rendered {
    max-width: none;
    width: 100%;
    padding: 0;
    margin: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }

  .content {
    padding: 0 8px;
  }
}

.dialog {
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: 0;
  width: min(560px, 92vw);
  background: var(--bg);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 140ms ease-out, transform 140ms ease-out;
}

.dialog[open] {
  opacity: 1;
  transform: translateY(0);
}

.dialog::backdrop {
  background: rgba(15, 23, 42, 0.18);
}

.dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--stroke);
}

.dialog__header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
}

.dialog__body {
  padding: 20px 22px 24px;
  display: grid;
  gap: 14px;
}

.dialog__actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.dialog textarea,
.dialog input,
.dialog select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  background: var(--bg-muted);
  color: var(--ink);
}

.dialog textarea {
  min-height: 200px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.share-link {
  display: flex;
  gap: 10px;
}

.share-link input {
  flex: 1;
}

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.status {
  font-size: 12px;
  color: var(--muted);
}

.status[data-tone="warn"] {
  color: var(--accent-strong);
}

@media (max-width: 1080px) {
  .topbar {
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 20px;
  }

  .topbar__right {
    flex-wrap: wrap;
  }

  .workspace {
    padding: 48px 20px 80px;
  }

  .workspace__panes {
    flex-direction: column;
  }

  .toc-panel,
  .settings-panel {
    position: static;
    width: 100%;
    max-width: none;
    flex: 1 1 auto;
  }
}

@media (max-width: 720px) {
  .menu-bar {
    flex-wrap: wrap;
    gap: 8px;
  }

  .workspace {
    padding: 40px 16px 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .topbar,
  .empty-state,
  .toast,
  .bg-grid,
  .viewer-footer {
    display: none !important;
  }

  .workspace {
    padding: 0;
  }

  .pane {
    border: none;
  }

  .content {
    max-width: 100%;
  }
}