:root {
  color-scheme: light;
  --page: #f5f7f5;
  --surface: #ffffff;
  --surface-soft: #f8faf8;
  --surface-hover: #f0f4f1;
  --border: #e1e6e2;
  --border-strong: #cbd4cd;
  --text: #202522;
  --text-secondary: #626b65;
  --text-muted: #8a948d;
  --accent: #228c51;
  --accent-strong: #187942;
  --accent-soft: #eaf7ef;
  --danger: #b54242;
  --code-bg: #f3f5f3;
  --selection: #cdebd9;
  --scrollbar: #cbd3cd;
  --syntax-comment: #78827b;
  --syntax-keyword: #8c4aa0;
  --syntax-string: #267a52;
  --syntax-number: #ae5b35;
  --syntax-title: #2f67ad;
  --syntax-meta: #96691f;
  --syntax-variable: #9a4c49;
  --toolbar-height: 47px;
  --status-height: 34px;
  --header-height: 64px;
  --editor-width: 50%;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #171a18;
  --surface: #1d211e;
  --surface-soft: #222723;
  --surface-hover: #2b312c;
  --border: #333a35;
  --border-strong: #485149;
  --text: #e9eee9;
  --text-secondary: #aeb8b0;
  --text-muted: #818b83;
  --accent: #55bd7d;
  --accent-strong: #6dce90;
  --accent-soft: #243d2c;
  --danger: #e17a7a;
  --code-bg: #262b27;
  --selection: #315b40;
  --scrollbar: #4a534c;
  --syntax-comment: #89958c;
  --syntax-keyword: #d596e8;
  --syntax-string: #86d5a5;
  --syntax-number: #e6a172;
  --syntax-title: #83b7f4;
  --syntax-meta: #d9bb72;
  --syntax-variable: #e39a96;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--page);
  color: var(--text);
}

button,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
textarea:focus-visible,
.splitter:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

::selection {
  background: var(--selection);
}

.app-shell {
  display: grid;
  grid-template-rows: var(--header-height) minmax(0, 1fr) var(--status-height);
  width: 100%;
  height: 100dvh;
  background: var(--surface);
}

.topbar {
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 24px;
  min-width: 0;
  padding: 0 18px 0 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
}

.brand-mark svg {
  width: 25px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 1px;
  white-space: nowrap;
}

.brand-copy strong {
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.brand-copy small {
  color: var(--text-muted);
  font-size: 11px;
}

.top-actions {
  display: flex;
  min-width: 0;
  margin-left: auto;
  align-items: center;
  gap: 7px;
  overflow-x: auto;
  scrollbar-width: none;
}

.top-actions::-webkit-scrollbar,
.editor-toolbar::-webkit-scrollbar {
  display: none;
}

.button {
  display: inline-flex;
  flex: 0 0 auto;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 11px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 550;
  line-height: 1;
  white-space: nowrap;
  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}

.button:hover {
  background: var(--surface-hover);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

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

.button.secondary {
  border-color: var(--border);
  background: var(--surface);
}

.button.secondary:hover {
  border-color: var(--border-strong);
}

.button.ghost {
  color: var(--text-secondary);
}

.button.compact {
  width: 34px;
  padding: 0;
}

.button.danger-text:hover {
  background: color-mix(in srgb, var(--danger) 9%, transparent);
  color: var(--danger);
}

.icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.workspace {
  display: grid;
  min-width: 0;
  min-height: 0;
  grid-template-columns: minmax(260px, var(--editor-width)) 7px minmax(260px, 1fr);
  overflow: hidden;
  background: var(--surface);
}

.pane {
  display: grid;
  min-width: 0;
  min-height: 0;
  grid-template-rows: var(--toolbar-height) minmax(0, 1fr);
  overflow: hidden;
  background: var(--surface);
}

.pane-header {
  display: flex;
  min-width: 0;
  align-items: center;
  height: var(--toolbar-height);
  border-bottom: 1px solid var(--border);
  background: var(--surface-soft);
}

.editor-toolbar {
  gap: 4px;
  padding: 0 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.toolbar-group {
  display: flex;
  flex: 0 0 auto;
  gap: 2px;
}

.toolbar-divider {
  width: 1px;
  height: 19px;
  flex: 0 0 auto;
  margin: 0 3px;
  background: var(--border);
}

.toolbar-spacer {
  min-width: 4px;
  flex: 1 0 4px;
}

.tool-button {
  display: inline-grid;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  padding: 0;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  transition: background-color 100ms ease, color 100ms ease;
}

.tool-button:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.tool-button.text-icon {
  font-size: 11px;
  font-weight: 700;
}

.tool-button.mono {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 10px;
  font-weight: 700;
}

#markdownInput {
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  resize: none;
  padding: 24px clamp(20px, 3vw, 42px) 90px;
  border: 0;
  outline: 0;
  background: var(--surface);
  color: var(--text);
  caret-color: var(--accent);
  font-family: "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", "Microsoft YaHei", monospace;
  font-size: 14px;
  line-height: 1.72;
  tab-size: 2;
  overflow: auto;
}

#markdownInput::placeholder {
  color: var(--text-muted);
}

.splitter {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 0;
  place-items: center;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background: var(--surface-soft);
  cursor: col-resize;
  touch-action: none;
}

.splitter::before {
  position: absolute;
  inset: 0 -4px;
  content: "";
}

.splitter span {
  width: 2px;
  height: 28px;
  border-radius: 4px;
  background: var(--border-strong);
  transition: background-color 100ms ease, height 100ms ease;
}

.splitter:hover span,
.splitter.dragging span {
  height: 42px;
  background: var(--accent);
}

body.is-resizing,
body.is-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}

.preview-header {
  justify-content: space-between;
  padding: 0 16px 0 18px;
}

.preview-title,
.preview-actions,
.privacy-badge {
  display: inline-flex;
  align-items: center;
}

.preview-title {
  gap: 8px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.live-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
}

.live-dot {
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.privacy-badge {
  gap: 5px;
  color: var(--text-muted);
  font-size: 11px;
}

.privacy-badge .icon {
  width: 13px;
  height: 13px;
}

.preview-actions {
  gap: 13px;
}

.sync-scroll-button {
  display: inline-flex;
  min-height: 27px;
  align-items: center;
  gap: 5px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 11px;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.sync-scroll-button:hover {
  background: var(--surface-hover);
  color: var(--text-secondary);
}

.sync-scroll-button[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.sync-scroll-button .icon {
  width: 14px;
  height: 14px;
}

.markdown-body {
  min-width: 0;
  min-height: 0;
  margin: 0;
  padding: 28px clamp(24px, 4vw, 58px) 100px;
  overflow: auto;
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

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

.markdown-body > :last-child {
  margin-bottom: 0 !important;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--text);
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.markdown-body h1 {
  margin: 0 0 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 750;
}

.markdown-body h2 {
  margin: 38px 0 15px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 24px;
  font-weight: 720;
}

.markdown-body h3 {
  margin: 30px 0 12px;
  font-size: 19px;
  font-weight: 700;
}

.markdown-body h4 {
  margin: 24px 0 10px;
  font-size: 16px;
}

.markdown-body p {
  margin: 0 0 16px;
}

.markdown-body a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.markdown-body strong {
  font-weight: 700;
}

.markdown-body blockquote {
  margin: 20px 0;
  padding: 10px 17px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--text-secondary);
}

.markdown-body blockquote > :last-child {
  margin-bottom: 0;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0 0 17px;
  padding-left: 1.7em;
}

.markdown-body li + li {
  margin-top: 5px;
}

.markdown-body li > p {
  margin-bottom: 7px;
}

.markdown-body .task-list-item {
  list-style: none;
}

.markdown-body .task-list-item input {
  width: 14px;
  height: 14px;
  margin: 0 7px 0 -1.45em;
  accent-color: var(--accent);
  vertical-align: -2px;
}

.markdown-body code {
  padding: 0.18em 0.42em;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--code-bg);
  color: color-mix(in srgb, var(--text) 90%, #b04242);
  font-family: "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  font-size: 0.88em;
}

.markdown-body pre {
  position: relative;
  margin: 20px 0;
  padding: 17px 19px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--code-bg);
  line-height: 1.65;
  overflow: auto;
}

.markdown-body pre[data-language] {
  padding-top: 34px;
}

.markdown-body pre[data-language]::before {
  position: absolute;
  top: 9px;
  right: 12px;
  color: var(--text-muted);
  content: attr(data-language);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.markdown-body pre code {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-size: 13px;
}

.markdown-body .hljs-comment,
.markdown-body .hljs-quote {
  color: var(--syntax-comment);
  font-style: italic;
}

.markdown-body .hljs-keyword,
.markdown-body .hljs-selector-tag,
.markdown-body .hljs-literal,
.markdown-body .hljs-section,
.markdown-body .hljs-link {
  color: var(--syntax-keyword);
}

.markdown-body .hljs-string,
.markdown-body .hljs-regexp,
.markdown-body .hljs-addition,
.markdown-body .hljs-attribute,
.markdown-body .hljs-template-tag,
.markdown-body .hljs-template-variable {
  color: var(--syntax-string);
}

.markdown-body .hljs-number,
.markdown-body .hljs-symbol,
.markdown-body .hljs-bullet,
.markdown-body .hljs-deletion {
  color: var(--syntax-number);
}

.markdown-body .hljs-title,
.markdown-body .hljs-title.class_,
.markdown-body .hljs-title.function_,
.markdown-body .hljs-selector-id,
.markdown-body .hljs-selector-class {
  color: var(--syntax-title);
}

.markdown-body .hljs-meta,
.markdown-body .hljs-doctag,
.markdown-body .hljs-built_in,
.markdown-body .hljs-type {
  color: var(--syntax-meta);
}

.markdown-body .hljs-variable,
.markdown-body .hljs-params,
.markdown-body .hljs-property,
.markdown-body .hljs-attr {
  color: var(--syntax-variable);
}

.markdown-body .hljs-emphasis {
  font-style: italic;
}

.markdown-body .hljs-strong {
  font-weight: 700;
}

.markdown-body .katex-display {
  margin: 1.4em 0;
  padding: 4px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.markdown-body .katex {
  font-size: 1.08em;
}

.markdown-body .katex-error {
  color: var(--danger) !important;
}

.markdown-body table {
  display: block;
  width: max-content;
  max-width: 100%;
  margin: 20px 0;
  border-spacing: 0;
  border-collapse: collapse;
  overflow-x: auto;
}

.markdown-body th,
.markdown-body td {
  min-width: 100px;
  padding: 9px 13px;
  border: 1px solid var(--border-strong);
  text-align: left;
}

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

.markdown-body tr:nth-child(even) td {
  background: color-mix(in srgb, var(--surface-soft) 70%, transparent);
}

.markdown-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 20px auto;
  border-radius: 7px;
}

.markdown-body hr {
  height: 1px;
  margin: 32px 0;
  border: 0;
  background: var(--border-strong);
}

.statusbar {
  z-index: 4;
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 18px;
  padding: 0 14px 0 18px;
  border-top: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--text-muted);
  font-size: 11px;
}

.document-stats,
.save-status {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
}

.document-stats {
  gap: 8px;
  font-variant-numeric: tabular-nums;
}

.document-stats i {
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: currentColor;
}

.storage-note {
  min-width: 0;
  margin: 0 auto;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.save-status {
  gap: 6px;
  min-width: 105px;
  justify-content: flex-end;
  color: var(--text-secondary);
}

.save-status.saving .status-dot {
  background: #d99b2b;
  animation: pulse 1s ease infinite;
}

.save-status.error {
  color: var(--danger);
}

.save-status.error .status-dot {
  background: var(--danger);
}

@keyframes pulse {
  50% { opacity: 0.35; }
}

.toast {
  position: fixed;
  z-index: 100;
  right: 18px;
  bottom: 50px;
  max-width: calc(100vw - 36px);
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--text);
  color: var(--surface);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 160ms ease, transform 160ms ease;
}

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

.mobile-tabs {
  display: none;
}

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

.focus-mode .topbar,
.focus-mode .statusbar {
  display: none;
}

.focus-mode {
  grid-template-rows: minmax(0, 1fr);
}

@media (max-width: 1120px) {
  .brand-copy small,
  .button.danger-text span,
  .button.secondary span {
    display: none;
  }

  .button.secondary,
  .button.danger-text {
    width: 34px;
    padding: 0;
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 58px;
    --status-height: 34px;
  }

  .app-shell {
    grid-template-rows: var(--header-height) 40px minmax(0, 1fr) var(--status-height);
  }

  .topbar {
    gap: 12px;
    padding: 0 10px 0 13px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .brand-copy strong {
    font-size: 14px;
  }

  .brand-copy small {
    display: none;
  }

  .top-actions {
    gap: 5px;
  }

  .button {
    min-height: 32px;
  }

  .button.primary {
    padding: 0 10px;
  }

  .button.primary span {
    display: none;
  }

  .button.compact,
  .button.secondary,
  .button.danger-text {
    width: 32px;
  }

  .mobile-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 5px 12px 0;
    border-bottom: 1px solid var(--border);
    background: var(--surface-soft);
  }

  .mobile-tab {
    position: relative;
    border: 0;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
  }

  .mobile-tab::after {
    position: absolute;
    right: 24%;
    bottom: -1px;
    left: 24%;
    height: 2px;
    border-radius: 2px 2px 0 0;
    background: var(--accent);
    content: "";
    opacity: 0;
  }

  .mobile-tab.active {
    color: var(--text);
  }

  .mobile-tab.active::after {
    opacity: 1;
  }

  .workspace {
    display: block;
    min-height: 0;
  }

  .pane {
    width: 100%;
    height: 100%;
  }

  .preview-pane,
  .splitter {
    display: none;
  }

  .sync-scroll-button {
    display: none;
  }

  .workspace.mobile-preview .editor-pane {
    display: none;
  }

  .workspace.mobile-preview .preview-pane {
    display: grid;
  }

  #markdownInput {
    padding: 20px 18px 80px;
    font-size: 14px;
  }

  .markdown-body {
    padding: 24px 20px 80px;
  }

  .markdown-body h1 {
    font-size: 28px;
  }

  .storage-note {
    display: none;
  }

  .statusbar {
    justify-content: space-between;
    gap: 8px;
    padding: 0 10px;
  }

  .save-status {
    min-width: 0;
  }

  .focus-mode {
    grid-template-rows: 40px minmax(0, 1fr);
  }
}

@media (max-width: 430px) {
  .brand-copy {
    display: none;
  }

  .top-actions {
    width: 100%;
  }

  #themeButton {
    margin-left: auto;
  }

  .document-stats {
    gap: 5px;
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}