/* =========================================================
   AyayaMarkdown —— 样式表
   - 应用运行时固定使用深色主题；导出文件另有独立的明暗样式
   - 所有颜色用 CSS 变量管理，方便维护
   ========================================================= */

/* ------- 主题变量 ------- */
:root,
body[data-theme="light"] {
  --bg: #fafbfc;
  --bg-elevated: #ffffff;
  --bg-subtle: #f4f5f7;
  --bg-hover: #eef0f3;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #1f2328;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: rgba(79, 70, 229, 0.08);
  --accent: #10b981;
  --danger: #ef4444;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10);
  --code-bg: #f6f8fa;
  --code-border: #e5e7eb;
  --kbd-bg: #f4f5f7;
  --syntax-heading: #3730a3;
  --syntax-heading-bg: rgba(79, 70, 229, 0.09);
  --syntax-quote: #047857;
  --syntax-link: #2563eb;
  --syntax-url: #0f766e;
  --syntax-code: #b42318;
  --syntax-code-bg: rgba(180, 35, 24, 0.08);
  --syntax-list: #9333ea;
  --syntax-formatting: #8b949e;
  --syntax-hr: #64748b;
  --syntax-tag: #c2410c;
  --syntax-attribute: #7c3aed;
  --syntax-math-delim: #d97706;
}

body[data-theme="dark"] {
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --bg-subtle: #1c2128;
  --bg-hover: #21262d;
  --border: #30363d;
  --border-strong: #444c56;
  --text: #e6edf3;
  --text-muted: #9ba1a8;
  --text-faint: #6e7681;
  --primary: #818cf8;
  --primary-hover: #a5b4fc;
  --primary-soft: rgba(129, 140, 248, 0.12);
  --accent: #34d399;
  --danger: #f87171;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --code-bg: #1c2128;
  --code-border: #30363d;
  --kbd-bg: #21262d;
  --syntax-heading: #a5b4fc;
  --syntax-heading-bg: rgba(129, 140, 248, 0.18);
  --syntax-quote: #6ee7b7;
  --syntax-link: #93c5fd;
  --syntax-url: #67e8f9;
  --syntax-code: #fca5a5;
  --syntax-code-bg: rgba(252, 165, 165, 0.12);
  --syntax-list: #d8b4fe;
  --syntax-formatting: #8b949e;
  --syntax-hr: #94a3b8;
  --syntax-tag: #fdba74;
  --syntax-attribute: #c4b5fd;
  --syntax-math-delim: #fbbf24;
}

/* ------- 基础重置 ------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
[role="separator"]:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============================================================
   顶部工具栏
   ============================================================ */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  height: 56px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-center {
  flex: 1;
  justify-content: center;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0;
}

.logo svg {
  width: 22px;
  height: 22px;
  color: #7ee787;
}

.logo-text {
  color: #7ee787;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.btn:active {
  transform: scale(0.97);
}

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

/* 图标按钮（无文字） */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--text-muted);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

/* 主题切换：根据 body 主题显示对应图标 */
body[data-theme="light"] .icon-moon {
  display: none;
}
body[data-theme="dark"] .icon-sun {
  display: none;
}

.icon-sidebar-closed {
  display: none;
}

body.sidebar-collapsed .icon-sidebar-open {
  display: none;
}

body.sidebar-collapsed .icon-sidebar-closed {
  display: block;
}

.divider {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 4px;
}

/* ============================================================
   工作区：文档列表 / 左编辑 / 分割线 / 右预览
   ============================================================ */
.workspace {
  flex: 1;
  display: flex;
  min-height: 0;
  background: var(--bg);
}

.document-sidebar {
  flex: 0 0 var(--sidebar-width, 248px);
  width: var(--sidebar-width, 248px);
  min-width: 180px;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  opacity: 1;
  transform: translateX(0);
  transition:
    flex-basis 0.22s ease,
    width 0.22s ease,
    min-width 0.22s ease,
    max-width 0.22s ease,
    opacity 0.18s ease,
    transform 0.22s ease,
    border-color 0.22s ease;
}

/* 拖动调整宽度时关掉宽度过渡，否则每次 mousemove 都要花 0.22s 才追上鼠标，看起来像在闪 */
.document-sidebar.resizing {
  transition: none;
}

body.sidebar-collapsed .document-sidebar {
  flex-basis: 0;
  width: 0;
  min-width: 0;
  max-width: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-14px);
  border-right-color: transparent;
}

body.sidebar-collapsed .document-sidebar-resizer {
  display: none;
}

.document-sidebar-resizer {
  position: absolute;
  top: 0;
  right: -4px;
  width: 8px;
  height: 100%;
  cursor: col-resize;
  z-index: 2;
  touch-action: none;
}

.document-sidebar-resizer::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 3px;
  width: 3px;
  height: 44px;
  border-radius: 999px;
  background: var(--border-strong);
  opacity: 0;
  transform: translateY(-50%);
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

.document-sidebar-resizer:hover::after,
.document-sidebar.resizing .document-sidebar-resizer::after {
  opacity: 1;
  background: var(--primary);
}

.document-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  min-height: 68px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
}

.document-sidebar-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.document-sidebar-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-muted);
}

.document-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.document-action {
  width: 30px;
  height: 30px;
  border-radius: 7px;
}

.document-action svg {
  width: 16px;
  height: 16px;
}

.document-list {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 8px;
}

.document-item {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  border-radius: 8px;
  transition: background-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.document-item + .document-item {
  margin-top: 4px;
}

.document-item.active {
  background: var(--primary-soft);
  box-shadow: inset 3px 0 0 var(--primary);
}

.document-item:hover {
  transform: translateX(2px);
}

.document-switch {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  border-radius: 8px;
  text-align: left;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.document-switch:hover {
  background: var(--bg-hover);
}

.document-item.active .document-switch:hover {
  background: transparent;
}

.document-icon {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  color: var(--primary);
}

.document-info {
  display: block;
  min-width: 0;
}

.document-title,
.document-meta {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.document-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.document-meta {
  margin-top: 1px;
  font-size: 11px;
  color: var(--text-muted);
}

.document-delete {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-right: 4px;
  border-radius: 6px;
  color: var(--text-faint);
  opacity: 0;
  transition: background-color 0.15s ease, color 0.15s ease, opacity 0.15s ease;
}

.document-delete:hover {
  color: var(--danger);
  background: var(--bg-hover);
}

.document-delete svg {
  width: 14px;
  height: 14px;
}

.document-item:hover .document-delete,
.document-item.active .document-delete,
.document-item:focus-within .document-delete {
  opacity: 1;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--bg-elevated);
}

/* 编辑 / 预览默认平分侧边栏以外的宽度（flex-basis 0 + 相同 grow），
   不能写 50%：那是整个 workspace 的一半，侧边栏展开时预览区会被挤窄 */
.pane-editor {
  flex: 1 1 0;
}

.pane-preview {
  flex: 1 1 0;
  border-left: 1px solid var(--border);
  position: relative;
}

/* 跳转后浮在预览区右上角的"返回上次位置"按钮 */
.jump-back-btn {
  position: absolute;
  top: 48px;
  right: 18px;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 500;
  color: #0d1117;
  background: #7ee787;
  border: 1px solid #7ee787;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease, background-color 0.15s ease;
}

.jump-back-btn[hidden] {
  display: none;
}

.jump-back-btn.visible {
  opacity: 1;
  transform: translateY(0);
}

.jump-back-btn:hover {
  background: #6dd97a;
}

.jump-back-btn svg {
  width: 14px;
  height: 14px;
}

/* 面板头部（编辑/预览的小标签） */
.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 36px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
  flex-shrink: 0;
}

/* 编辑器格式化工具栏（在编辑面板的 pane-header 右侧） */
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  /* 不再横向滚动：溢出的按钮由 JS 折叠进 .editor-tool-popup 下拉里 */
  overflow: visible;
  flex: 1;
  min-width: 0;
  justify-content: flex-end;
  margin-left: 12px;
}

/* JS 测算后给放不下的元素加上这个属性来隐藏；初始挂在「更多」按钮上 */
.editor-toolbar [data-overflow-hidden] {
  display: none !important;
}

.editor-tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 24px;
  padding: 0;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  flex-shrink: 0;
  font-family: inherit;
  font-size: 12px;
  line-height: 1;
}

.editor-tool-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--border);
}

.editor-tool-btn:active {
  background: var(--primary-soft);
  color: var(--primary);
}

.editor-tool-btn svg {
  width: 14px;
  height: 14px;
}

.editor-tool-text {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.editor-tool-bold {
  font-weight: 800;
}

.editor-tool-italic {
  font-style: italic;
}

.editor-tool-strike {
  text-decoration: line-through;
}

.editor-tool-divider {
  display: inline-block;
  width: 1px;
  height: 14px;
  background: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* 「更多」按钮 + 下拉容器：position: relative 让 popup 相对它定位 */
.editor-tool-more-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.editor-tool-more.is-open {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--border);
}

/* 下拉面板：竖排显示被折叠的工具按钮，点中后等价于点原按钮 */
.editor-tool-popup {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 160px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  gap: 2px;
  z-index: 50;
}

.editor-tool-popup[hidden] {
  display: none;
}

/* 下拉里的按钮改为左对齐、占满整行，并把 title 当文字标签显示 */
.editor-tool-popup .editor-tool-btn {
  width: 100%;
  height: auto;
  min-height: 28px;
  padding: 6px 10px;
  justify-content: flex-start;
  gap: 10px;
  font-size: 12.5px;
  color: var(--text);
  white-space: nowrap;
}

.editor-tool-popup .editor-tool-btn::after {
  content: attr(data-label);
  font-weight: 500;
  letter-spacing: 0;
  font-style: normal;
  text-decoration: none;
  color: var(--text);
}

/* 下拉里不显示分隔线（横竖混排不好看，直接隐藏） */
.editor-tool-popup .editor-tool-divider {
  display: none;
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-edit {
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary-soft);
}

.dot-preview {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.25);
}

.pane-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  position: relative;
}

.export-render-host {
  position: fixed;
  top: 0;
  left: -100000px;
  width: 860px;
  visibility: hidden;
  pointer-events: none;
}

/* ============================================================
   编辑器（CodeMirror）
   ============================================================ */
.CodeMirror {
  height: 100% !important;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  line-height: 1.7;
  background: var(--bg-elevated);
  color: var(--text);
  padding: 8px 0;
}

.CodeMirror-lines {
  padding: 8px 0;
}

.CodeMirror-gutters {
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  padding-right: 4px;
}

.CodeMirror-linenumber {
  color: var(--text-faint);
  font-size: 12px;
  padding: 0 8px 0 12px;
}

.CodeMirror-cursor {
  border-left: 2px solid var(--primary) !important;
}

.CodeMirror-activeline-background {
  background: var(--primary-soft) !important;
}

.CodeMirror-selected {
  background: rgba(79, 70, 229, 0.18) !important;
}

body[data-theme="dark"] .CodeMirror-selected {
  background: rgba(129, 140, 248, 0.25) !important;
}

/* ============================================================
   编辑器语法着色
   设计原则（克制、清晰、有层次）：
   - 标题靠"字号梯度 + 字重 + 主色"形成层次，不用色块背景
   - 加粗 / 斜体只改字重和字形，不改颜色，避免和标题、链接抢戏
   - 格式化标记（# > * _ ` 等）统一淡化为 muted 色，让正文成为视觉主角
   - 行内代码、公式用极小 padding 的浅色背景，不撑高行距
   ============================================================ */

/* 标题：纯色 + 字重 + 明显的字号梯度 */
.CodeMirror .cm-header {
  color: var(--syntax-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.CodeMirror .cm-header-1 {
  font-size: 1.55em;
  line-height: 1.35;
}

.CodeMirror .cm-header-2 {
  font-size: 1.32em;
  line-height: 1.35;
}

.CodeMirror .cm-header-3 {
  font-size: 1.16em;
}

.CodeMirror .cm-header-4 {
  font-size: 1.08em;
}

.CodeMirror .cm-header-5,
.CodeMirror .cm-header-6 {
  font-size: 1em;
}

/* 格式化标记（# > * _ ` 等）整体淡化
   注意：cm-formatting-header 同时具有 cm-header-N 类，
   所以放在 cm-header 规则之后才能覆盖颜色和字重 */
.CodeMirror .cm-formatting {
  color: var(--syntax-formatting);
  font-weight: 400;
  opacity: 0.7;
}

.CodeMirror .cm-formatting-header {
  color: var(--syntax-formatting);
  font-weight: 400;
  opacity: 0.55;
}

.CodeMirror .cm-meta {
  color: var(--syntax-formatting);
}

/* 引用：用 muted 色 + 斜体，避免大块染色 */
.CodeMirror .cm-quote {
  color: var(--text-muted);
  font-style: italic;
}

/* 链接文字 / 图片描述 */
.CodeMirror .cm-link,
.CodeMirror .cm-image {
  color: var(--syntax-link);
  font-weight: 500;
}

/* URL 部分：偏色蓝绿 + 下划线 */
.CodeMirror .cm-url {
  color: var(--syntax-url);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  opacity: 0.85;
}

/* 加粗：只改字重，颜色继承正文（避免变成标题靛蓝色那种突兀效果） */
.CodeMirror .cm-strong {
  color: inherit;
  font-weight: 700;
}

/* 斜体：只改字形，颜色继承正文 */
.CodeMirror .cm-em {
  color: inherit;
  font-style: italic;
}

/* 删除线：用 muted 色（不要太淡到看不见）+ 划线 */
.CodeMirror .cm-strikethrough {
  color: var(--text-muted);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

/* 行内代码（gfm 模式把它标为 cm-comment）
   注意：fenced code 内的 JS/Python 注释也走 cm-comment，
   所以这里的样式必须既适合"行内代码"又不破坏注释观感 ——
   方案：极小 padding + 等宽字体 + 浅色背景 */
.CodeMirror .cm-comment {
  color: var(--syntax-code);
  background: var(--syntax-code-bg);
  border-radius: 3px;
  padding: 0 3px;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
}

/* 数学公式：等宽 + 正常字色 */
.CodeMirror .cm-math {
  color: var(--text) !important;
  background: transparent !important;
  font-style: normal !important;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95em;
  text-decoration: none !important;
}

.CodeMirror .cm-math-delimiter {
  color: var(--syntax-math-delim) !important;
  font-weight: 700;
}

/* 水平分割线 --- */
.CodeMirror .cm-hr {
  color: var(--syntax-hr);
  font-weight: 700;
  letter-spacing: 0.15em;
}

/* 列表标记（- + * 1.）— markdown 模式标为 variable-2/3 */
.CodeMirror .cm-variable-2,
.CodeMirror .cm-variable-3 {
  color: var(--syntax-list);
  font-weight: 600;
}

/* fenced code 内部高亮（注入 inner mode 时使用） */
.CodeMirror .cm-keyword,
.CodeMirror .cm-operator {
  color: var(--syntax-attribute);
  font-weight: 600;
}

.CodeMirror .cm-string,
.CodeMirror .cm-string-2 {
  color: var(--syntax-quote);
}

.CodeMirror .cm-number,
.CodeMirror .cm-atom {
  color: var(--syntax-list);
}

.CodeMirror .cm-def,
.CodeMirror .cm-builtin,
.CodeMirror .cm-property {
  color: var(--syntax-link);
}

.CodeMirror .cm-tag {
  color: var(--syntax-tag);
}

.CodeMirror .cm-attribute,
.CodeMirror .cm-qualifier {
  color: var(--syntax-attribute);
}

.CodeMirror .cm-error {
  color: var(--danger);
  text-decoration: underline;
  text-decoration-style: wavy;
}

/* ============================================================
   分割线
   ============================================================ */
.splitter {
  width: 6px;
  background: transparent;
  cursor: col-resize;
  position: relative;
  flex-shrink: 0;
  transition: background-color 0.15s ease;
  touch-action: none;
}

.splitter:hover,
.splitter.dragging {
  background: var(--primary-soft);
}

.splitter-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 40px;
  border-radius: 2px;
  background: var(--border-strong);
  opacity: 0;
  transition: opacity 0.15s ease;
}

.splitter:hover .splitter-handle,
.splitter.dragging .splitter-handle {
  opacity: 1;
}

/* ============================================================
   预览区：精排版
   ============================================================ */
.markdown-body {
  padding: 40px 56px;
  max-width: 860px;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  word-wrap: break-word;
}

.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 {
  margin: 1.6em 0 0.6em;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.3;
}

.markdown-body h1 {
  font-size: 2em;
}

.markdown-body h2 {
  font-size: 1.5em;
}

.markdown-body h3 {
  font-size: 1.25em;
}

.markdown-body h4 {
  font-size: 1em;
}

.markdown-body p {
  margin: 0.8em 0;
}

.markdown-body a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.markdown-body a:hover {
  border-bottom-color: var(--primary);
}

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

.markdown-body em {
  font-style: italic;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0.8em 0;
  padding-left: 1.8em;
}

.markdown-body li {
  margin: 0.3em 0;
}

.markdown-body li > ul,
.markdown-body li > ol {
  margin: 0.3em 0;
}

.markdown-body blockquote {
  margin: 1em 0;
  padding: 0.4em 1em;
  color: var(--text-muted);
  border-left: 4px solid var(--primary);
  background: var(--primary-soft);
  border-radius: 0 6px 6px 0;
}

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

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

/* 行内代码 */
.markdown-body code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 4px;
}

/* 代码块 */
.markdown-body pre {
  margin: 1em 0;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

.markdown-body pre code {
  display: block;
  padding: 16px 18px;
  background: transparent;
  border: none;
  border-radius: 0;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
}

/* 代码块右上角的语言标签 + 复制按钮（叠在 pre 上层，hover 切换） */
.code-block-wrapper {
  position: relative;
}

.code-lang-label,
.code-block-wrapper .copy-btn {
  position: absolute;
  top: 8px;
  right: 10px;
  z-index: 2;
  font-size: 11px;
  line-height: 1;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.02em;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.code-lang-label {
  padding: 4px 6px;
  opacity: 0.85;
}

.code-block-wrapper .copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 4px;
  opacity: 0;
  text-transform: none;
  font-weight: 500;
  background: var(--bg-subtle);
  border: 1px solid var(--code-border);
  cursor: pointer;
}

.code-block-wrapper:hover .code-lang-label,
.code-block-wrapper:focus-within .code-lang-label {
  opacity: 0;
}

.code-block-wrapper:hover .copy-btn,
.code-block-wrapper:focus-within .copy-btn {
  opacity: 1;
  pointer-events: auto;
}

.copy-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.copy-btn svg {
  width: 12px;
  height: 12px;
}

/* 表格 */
.markdown-body table {
  width: 100%;
  margin: 1em 0;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.markdown-body table th,
.markdown-body table td {
  padding: 8px 14px;
  text-align: left;
  border: 1px solid var(--border);
}

.markdown-body table th {
  background: var(--bg-subtle);
  font-weight: 600;
}

.markdown-body table tr:nth-child(even) td {
  background: var(--bg-subtle);
}

/* 分割线 */
.markdown-body hr {
  margin: 2em 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* 图片 */
.markdown-body img {
  max-width: 100%;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}

/* 任务列表：GFM 任务项不再显示圆点，复选框占据圆点的位置 */
.markdown-body input[type="checkbox"] {
  margin-right: 6px;
}

.markdown-body li:has(> input[type="checkbox"]:first-child),
.markdown-body li:has(> p:first-child > input[type="checkbox"]:first-child) {
  list-style: none;
}

.markdown-body li > input[type="checkbox"]:first-child,
.markdown-body li > p:first-child > input[type="checkbox"]:first-child {
  margin: 0 8px 0 -1.4em;
}

/* Mermaid 图表容器 */
.markdown-body .mermaid {
  margin: 1em 0;
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  overflow-x: auto;
}

/* KaTeX 公式 */
.markdown-body .katex {
  font-size: 1.05em;
}

.markdown-body .katex-display {
  margin: 1em 0;
  padding: 12px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ============================================================
   底部状态栏
   ============================================================ */
.statusbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  height: 32px;
  padding: 0 20px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.status-left {
  display: flex;
  align-items: center;
  gap: 18px;
}

.status-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.status-item strong {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   Toast 通知
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  pointer-events: auto;
  animation: toast-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.toast.toast-out {
  animation: toast-out 0.2s ease forwards;
}

.toast svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.toast.success svg {
  color: var(--accent);
}

.toast.error svg {
  color: var(--danger);
}

.toast.info svg {
  color: var(--primary);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(20px);
  }
}

/* ============================================================
   滚动条美化
   ============================================================ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 6px;
  border: 2px solid var(--bg-elevated);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-faint);
}

/* ============================================================
   响应式：窄屏改为上下布局
   ============================================================ */
@media (max-width: 768px) {
  .toolbar {
    padding: 0 12px;
    height: 52px;
  }

  .toolbar-center {
    gap: 2px;
  }

  .btn span {
    display: none;
  }

  .btn {
    padding: 7px 9px;
  }

  .logo-text {
    display: none;
  }

  .workspace {
    flex-direction: column;
  }

  .document-sidebar {
    flex: 0 0 156px;
    width: auto;
    min-width: 0;
    max-width: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .document-sidebar-resizer {
    display: none;
  }

  .document-sidebar-header {
    min-height: 52px;
    padding: 8px 12px;
  }

  .document-list {
    display: flex;
    gap: 8px;
    padding: 8px 12px 10px;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .document-item {
    flex: 0 0 220px;
    margin-top: 0;
  }

  .document-item + .document-item {
    margin-top: 0;
  }

  .document-delete {
    opacity: 1;
  }

  .pane-editor {
    flex: 1 !important;
  }

  .pane-preview {
    flex: 1 !important;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .splitter {
    display: none;
  }

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

@media (max-width: 360px) {
  .toolbar-right {
    display: none;
  }

  .toolbar {
    gap: 8px;
  }
}

@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;
  }
}