:root {
  color-scheme: light;
  --page-bg: #f5f6f8;
  --surface-bg: #fff;
  --text-color: #202124;
  --body-text-color: #343741;
  --muted-color: #737782;
  --subtle-color: #858994;
  --border-color: #e1e3e8;
  --divider-color: #e9eaee;
  --soft-bg: #f8f8fa;
  --inline-code-bg: #f0f1f5;
  --link-color: #5148dc;
  --brand-color: #625bf6;
  --blockquote-border: #d5d2ff;
  --error-border: #f0c4c4;
  --error-text: #a12626;
  --error-bg: #fff5f5;
  --shadow-color: rgb(34 39 52 / 5%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--text-color);
  background: var(--page-bg);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-optical-sizing: auto;
  font-weight: 400;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #15171c;
  --surface-bg: #1d2027;
  --text-color: #e6e8ee;
  --body-text-color: #d0d3dc;
  --muted-color: #a2a7b3;
  --subtle-color: #858c9a;
  --border-color: #343946;
  --divider-color: #2b303a;
  --soft-bg: #242832;
  --inline-code-bg: #2b303b;
  --link-color: #a9a2ff;
  --brand-color: #7770ff;
  --blockquote-border: #625bd0;
  --error-border: #744349;
  --error-text: #ff9a9a;
  --error-bg: #352327;
  --shadow-color: rgb(0 0 0 / 20%);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 0 32px 32px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 82px;
}

.brand-group {
  display: inline-flex;
  align-items: center;
  gap: 11px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: inherit;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: var(--brand-color);
  font-size: 14px;
  letter-spacing: -1px;
}

.version-label {
  display: inline-flex;
  align-items: center;
  transform: translateY(3px);
  padding: 2px 7px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  color: var(--muted-color);
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.version-label:hover {
  color: var(--text-color);
  background: var(--soft-bg);
}

.version-label:focus-visible {
  outline: 2px solid var(--brand-color);
  outline-offset: 2px;
}

.theme-toggle {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--body-text-color);
  background: var(--surface-bg);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.share-button {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--body-text-color);
  background: var(--surface-bg);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.theme-toggle:hover,
.share-button:hover {
  background: var(--soft-bg);
}

.theme-toggle:focus-visible,
.share-button:focus-visible {
  outline: 2px solid var(--brand-color);
  outline-offset: 2px;
}

.theme-icon {
  font-size: 16px;
  line-height: 1;
}

.app-header p {
  margin: 0;
  color: var(--muted-color);
  font-size: 13px;
  text-align: right;
}

.app-footer {
  padding-top: 12px;
  color: var(--subtle-color);
  font-size: 11px;
  text-align: right;
}

.app-footer a {
  margin-left: 8px;
  color: inherit;
  text-underline-offset: 2px;
}

.app-footer a:focus-visible {
  outline: 2px solid var(--brand-color);
  outline-offset: 2px;
}

.workspace-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding-bottom: 10px;
}

.share-controls {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 8px;
  margin-right: auto;
}

.share-status {
  color: var(--muted-color);
  font-size: 11px;
}

.share-status[data-error="true"] {
  color: var(--error-text);
}

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

.view-controls {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--surface-bg);
}

.view-controls button {
  min-height: 34px;
  padding: 0 11px;
  border: 0;
  color: var(--body-text-color);
  background: transparent;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.view-controls button + button {
  border-left: 1px solid var(--border-color);
}

.view-controls button[aria-pressed="true"] {
  color: var(--text-color);
  background: var(--soft-bg);
  font-weight: 650;
}

.view-controls button:focus-visible {
  position: relative;
  z-index: 1;
  outline: 2px solid var(--brand-color);
  outline-offset: -2px;
}

.workspace {
  display: grid;
  flex: 1;
  grid-template-columns: minmax(0, var(--editor-size, 50%)) 8px minmax(0, 1fr);
  overflow: hidden;
  min-height: 400px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--surface-bg);
  box-shadow: 0 8px 30px var(--shadow-color);
}

.panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.editor-panel {
  grid-column: 1;
  grid-row: 1;
  border-right: 0;
}

.preview-panel {
  grid-column: 3;
  grid-row: 1;
}

.workspace-divider {
  position: relative;
  z-index: 1;
  grid-column: 2;
  grid-row: 1;
  cursor: col-resize;
  touch-action: none;
}

.workspace-divider::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 3px;
  width: 1px;
  background: var(--border-color);
  content: "";
}

.workspace-divider:hover::before,
.workspace-divider:focus-visible::before {
  left: 2px;
  width: 3px;
  background: var(--brand-color);
}

.workspace-divider:focus-visible {
  outline: 0;
}

.workspace[data-view="editor"] {
  grid-template-columns: minmax(0, 1fr);
}

.workspace[data-view="preview"] {
  grid-template-columns: minmax(0, 1fr);
}

.workspace[data-view="editor"] .preview-panel,
.workspace[data-view="preview"] .editor-panel,
.workspace[data-view="editor"] .workspace-divider,
.workspace[data-view="preview"] .workspace-divider {
  display: none;
}

.workspace[data-view="editor"] .editor-panel,
.workspace[data-view="preview"] .preview-panel {
  grid-column: 1;
}

.panel-header {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--divider-color);
}

.panel-header h1,
.panel-header h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 650;
}

.panel-hint {
  color: var(--subtle-color);
  font-size: 11px;
}

#markdown-input {
  width: 100%;
  min-height: 0;
  flex: 1;
  resize: none;
  padding: 22px;
  border: 0;
  outline: 0;
  color: var(--body-text-color);
  background: transparent;
  font: 13px/1.75 "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  tab-size: 2;
}

#markdown-input::placeholder {
  color: var(--subtle-color);
  opacity: 1;
}

#markdown-preview {
  min-height: 0;
  flex: 1;
  overflow: auto;
  padding: 22px 26px;
}

.markdown-body {
  overflow-wrap: anywhere;
  color: var(--body-text-color);
  font-size: 14px;
  line-height: 1.7;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 1.5em 0 0.6em;
  color: var(--text-color);
  line-height: 1.3;
}

.markdown-body h1 {
  font-size: 1.8em;
}

.markdown-body h2 {
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--divider-color);
  font-size: 1.45em;
}

.markdown-body h3 {
  font-size: 1.2em;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body table,
.markdown-body pre {
  margin: 0 0 1em;
}

.markdown-body a {
  color: var(--link-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.markdown-body blockquote {
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--blockquote-border);
  color: var(--muted-color);
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5em;
}

.markdown-body li + li {
  margin-top: 0.25em;
}

.markdown-body code {
  padding: 0.15em 0.35em;
  border-radius: 4px;
  background: var(--inline-code-bg);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

.markdown-body pre {
  overflow: auto;
  padding: 14px 16px;
  border: 1px solid var(--divider-color);
  border-radius: 8px;
  background: var(--soft-bg);
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  font-size: 12px;
}

.markdown-body table {
  display: block;
  width: 100%;
  overflow: auto;
  border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
  padding: 7px 10px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.markdown-body th {
  background: var(--soft-bg);
  font-weight: 650;
}

.markdown-body hr {
  height: 1px;
  margin: 1.5em 0;
  border: 0;
  background: var(--border-color);
}

.markdown-body img {
  max-width: 100%;
}

.markdown-body .fullscreen-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  display: grid;
  z-index: 1;
  width: 32px;
  height: 32px;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 7px;
  color: var(--body-text-color);
  background: var(--surface-bg);
  box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
  cursor: pointer;
}

.markdown-body .fullscreen-toggle:hover {
  color: var(--text-color);
  background: var(--soft-bg);
}

.markdown-body .fullscreen-toggle:focus-visible {
  outline: 2px solid var(--brand-color);
  outline-offset: 2px;
}

.markdown-body .diagram-viewport:fullscreen,
.markdown-body .chart-container:fullscreen {
  width: 100vw;
  max-width: none;
  height: 100vh;
  max-height: none;
  padding: 48px;
  background: var(--page-bg);
}

.markdown-body .diagram-viewport:fullscreen {
  display: grid;
  place-items: center;
}

.markdown-body .chart-container:fullscreen canvas {
  max-width: 100%;
  max-height: 100%;
}

.markdown-body .mermaid,
.markdown-body .graphviz {
  margin: 0 0 1em;
  padding: 12px;
}

.markdown-body .diagram-viewport {
  position: relative;
  max-height: min(90vh, 900px);
  overflow: auto;
  cursor: grab;
  overscroll-behavior: contain;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.markdown-body .diagram-viewport,
.markdown-body .diagram-viewport * {
  -webkit-user-select: none;
  user-select: none;
}

.markdown-body .diagram-viewport::-webkit-scrollbar {
  display: none;
}

.markdown-body .diagram-viewport.is-dragging {
  cursor: grabbing;
  user-select: none;
}

.markdown-body .diagram-canvas {
  position: relative;
  margin: 0 auto;
}

.markdown-body .diagram-canvas svg {
  display: block;
}

.markdown-body .mermaid-error {
  cursor: auto;
}

.markdown-body .chart-container {
  position: relative;
  width: 100%;
  max-width: 700px;
  height: 320px;
  margin: 0 auto 1.5em;
}

.markdown-body .render-error {
  padding: 12px 14px;
  border: 1px solid var(--error-border);
  border-radius: 6px;
  color: var(--error-text);
  background: var(--error-bg);
  font-size: 12px;
  white-space: pre-wrap;
}

.markdown-body .footnotes {
  margin-top: 2em;
  border-top: 1px solid var(--border-color);
  font-size: 0.9em;
}

.markdown-body .footnotes ol {
  padding-left: 1.5em;
}

.markdown-body .footnotes [data-footnote-backref] {
  margin-left: 0.25em;
  text-decoration: none;
}

.markdown-body dl {
  margin: 0 0 1em;
}

.markdown-body dt {
  margin-top: 0.75em;
  font-weight: 650;
}

.markdown-body dd {
  margin: 0.25em 0 0 1.5em;
}

.markdown-body .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5em 0;
}

.markdown-body .mermaid-error {
  border: 1px solid var(--error-border);
  border-radius: 6px;
  color: var(--error-text);
  background: var(--error-bg);
  font-size: 12px;
  white-space: pre-wrap;
}

.empty-state {
  color: var(--subtle-color);
  font-size: 13px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

@media (max-width: 700px) {
  .app {
    padding: 0 16px 16px;
  }

  .app-header {
    min-height: 74px;
  }

  .app-header p {
    display: none;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .workspace {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, var(--editor-size, 50%)) 8px minmax(0, 1fr);
    min-height: 560px;
  }

  .editor-panel,
  .preview-panel {
    grid-column: 1;
  }

  .preview-panel {
    grid-row: 3;
  }

  .workspace-divider {
    grid-column: 1;
    grid-row: 2;
    cursor: row-resize;
  }

  .workspace-divider::before {
    top: 3px;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 1px;
  }

  .workspace-divider:hover::before,
  .workspace-divider:focus-visible::before {
    top: 2px;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 3px;
  }

  .workspace[data-view="editor"],
  .workspace[data-view="preview"] {
    grid-template-rows: minmax(0, 1fr);
  }

  #markdown-input,
  #markdown-preview {
    padding: 18px;
  }
}

@media (max-width: 430px) {
  .app-header {
    gap: 12px;
  }

  .brand {
    gap: 7px;
    font-size: 14px;
  }

  .theme-toggle {
    width: 36px;
    flex: 0 0 36px;
    padding: 0;
  }

  .theme-label {
    display: none;
  }

  .workspace-toolbar {
    justify-content: space-between;
    gap: 8px;
  }

  .share-status {
    overflow-wrap: anywhere;
  }

  .view-controls button {
    padding: 0 7px;
    font-size: 11px;
  }
}