/* ==================== 全局样式 ==================== */
:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-tertiary: #313244;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --accent: #89b4fa;
  --accent-hover: #74c7ec;
  --success: #a6e3a1;
  --warning: #f9e2af;
  --danger: #f38ba8;
  --border: #45475a;
  --sidebar-width: 280px;
  --header-height: 56px;
}

/* 浅色主题 */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --accent: #0d6efd;
  --accent-hover: #0b5ed7;
  --success: #198754;
  --warning: #ffc107;
  --danger: #dc3545;
  --border: #dee2e6;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

/* ==================== 登录遮罩 ==================== */
.login-overlay {
  position: fixed;
  z-index: 9999;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s, visibility 0.3s;
}

.login-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 36px;
  width: 360px;
  max-width: 90vw;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.login-logo {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.login-desc {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 24px;
}

.login-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  text-align: center;
  transition: border-color 0.2s;
}

.login-input:focus {
  border-color: var(--accent);
}

.login-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
  min-height: 20px;
}

.password-strength {
  height: 4px;
  border-radius: 2px;
  margin-top: 8px;
  transition: all 0.3s;
  background: var(--bg-tertiary);
}

.password-strength.weak   { background: var(--danger); width: 33%; }
.password-strength.medium { background: var(--warning); width: 66%; }
.password-strength.strong { background: var(--success); width: 100%; }

.login-btn {
  margin-top: 8px;
  width: 100%;
  padding: 10px 0;
  font-size: 15px;
}

/* ==================== 快捷键帮助面板 ==================== */
.help-overlay {
  position: fixed;
  z-index: 9998;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, visibility 0.2s;
}

.help-overlay.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.help-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
  max-width: 640px;
  width: 90vw;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  max-height: 85vh;
  overflow-y: auto;
}

.help-panel-wide {
  max-width: 800px;
}

.help-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.help-header h2 {
  font-size: 18px;
  font-weight: 600;
}

/* 帮助面板标签切换 */
.help-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.help-tab {
  padding: 5px 14px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  font-size: 13px;
  transition: all 0.15s;
}

.help-tab:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.help-tab.active {
  background: var(--accent);
  color: #fff;
}

[data-theme="dark"] .help-tab.active { color: #1e1e2e; }

.help-tab-content {
  display: none;
}

.help-tab-content.active {
  display: block;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 24px;
}

.help-col h3 {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.help-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.help-item kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 11px;
  font-family: inherit;
  color: var(--text-primary);
}

.help-item code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 12px;
  color: var(--success);
}

@media (max-width: 600px) {
  .help-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ==================== 头部导航 ==================== */
.header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.search-input {
  width: 100%;
  max-width: 400px;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==================== 按钮样式 ==================== */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-icon {
  padding: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 18px;
  border-radius: 6px;
}

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

.btn-icon-only {
  padding: 5px 8px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
}

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

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

[data-theme="dark"] .btn-primary { color: #1e1e2e; }

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

[data-theme="dark"] .btn-danger:hover { color: #1e1e2e; }

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  color: var(--text-primary);
}

.btn-xs {
  padding: 3px 6px;
  font-size: 12px;
}

/* ==================== 主容器 ==================== */
.container {
  display: flex;
  height: calc(100vh - var(--header-height));
}

/* ==================== 侧边栏 ==================== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: margin-left 0.3s ease;
}

.sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.sidebar-header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.doc-count {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 10px;
}

.filter-bar {
  padding: 12px 16px;
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.filter-select {
  flex: 1;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 12px;
  outline: none;
}

.filter-select:focus {
  border-color: var(--accent);
}

/* 快速筛选标签 */
.quick-filter-bar {
  padding: 6px 16px;
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--border);
}

.quick-filter {
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 11px;
  transition: all 0.15s;
}

.quick-filter:hover {
  background: var(--bg-tertiary);
}

.quick-filter.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

[data-theme="dark"] .quick-filter.active { color: #1e1e2e; }

/* ==================== 文档列表 ==================== */
.doc-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

/* 批量操作底栏 */
.batch-bar {
  display: none;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}

.batch-bar.visible {
  display: flex;
}

.doc-item {
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: background 0.2s;
  border: 1px solid transparent;
}

.doc-item:hover {
  background: var(--bg-tertiary);
}

.doc-item.active {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}

.doc-item-title {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 多选模式 */
.doc-item.select-mode {
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.doc-item .doc-checkbox {
  display: none;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  accent-color: var(--accent);
  cursor: pointer;
}

.doc-item.select-mode .doc-checkbox {
  display: block;
}

.doc-item.selected {
  background: rgba(137, 180, 250, 0.1);
  border-color: var(--accent);
}

.doc-item .doc-item-body {
  flex: 1;
  min-width: 0;
}

.doc-item-meta {
  font-size: 11px;
  color: var(--text-secondary);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.doc-item-category {
  background: var(--bg-primary);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 10px;
}

.doc-item-tag {
  background: rgba(137, 180, 250, 0.12);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 10px;
  white-space: nowrap;
}

[data-theme="light"] .doc-item-tag {
  background: rgba(13, 110, 253, 0.1);
}

/* ==================== 编辑器区域 ==================== */
.editor-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 空状态 */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.empty-state h2 {
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hint {
  font-size: 13px;
  margin-top: 8px;
}

/* ==================== 编辑器包装器 ==================== */
.editor-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.hidden {
  display: none !important;
}

/* 工具栏 */
.editor-toolbar {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
}

.doc-title-input {
  font-size: 16px;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-primary);
  outline: none;
  width: 300px;
}

.doc-title-input::placeholder {
  color: var(--text-secondary);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.category-select {
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
}

.save-status {
  font-size: 12px;
  color: var(--success);
  min-width: 60px;
}

/* ==================== Markdown 格式工具栏 ==================== */
.md-toolbar {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  gap: 3px;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  flex-wrap: nowrap;
  scrollbar-width: thin;
}

.md-toolbar::-webkit-scrollbar {
  height: 4px;
}

.md-btn {
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  line-height: 1.4;
  min-width: 26px;
  text-align: center;
  transition: all 0.15s;
  white-space: nowrap;
}

.md-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border);
}

.md-btn:active {
  background: var(--accent);
  color: #fff;
}

[data-theme="dark"] .md-btn:active { color: #1e1e2e; }

.md-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* ==================== 模式标签 ==================== */
.mode-tabs {
  padding: 8px 16px;
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.tab {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  font-size: 13px;
  transition: all 0.2s;
}

.tab:hover {
  background: var(--bg-tertiary);
}

.tab.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

[data-theme="dark"] .tab.active { color: #1e1e2e; }

/* ==================== 编辑器内容 ==================== */
.editor-content {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.editor-content .CodeMirror {
  height: 100% !important;
  font-size: 15px;
  line-height: 1.7;
  padding: 8px;
}

/* CodeMirror 当前行高亮 */
.CodeMirror-activeline-background {
  background: rgba(137, 180, 250, 0.06) !important;
}

[data-theme="light"] .CodeMirror-activeline-background {
  background: rgba(13, 110, 253, 0.06) !important;
}

/* CodeMirror 匹配括号高亮 */
.CodeMirror-matchingbracket {
  color: var(--accent) !important;
  font-weight: 700;
  background: rgba(137, 180, 250, 0.15);
}

/* CodeMirror 查找/替换对话框 */
.CodeMirror-dialog {
  position: absolute;
  left: 0; right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 8px 14px;
  z-index: 15;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 13px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.CodeMirror-dialog-top {
  top: 0;
}

.CodeMirror-dialog-bottom {
  bottom: 0;
  border-top: 1px solid var(--border);
  border-bottom: none;
}

.CodeMirror-dialog input {
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  min-width: 160px;
}

.CodeMirror-dialog input:focus {
  border-color: var(--accent);
}

.CodeMirror-dialog button {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s;
}

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

[data-theme="dark"] .CodeMirror-dialog button:hover { color: #1e1e2e; }

.CodeMirror-dialog .CodeMirror-search-hint {
  display: none;
}

/* CodeMirror 查找匹配高亮 */
.cm-searching {
  background: rgba(249, 226, 175, 0.3) !important;
  border-bottom: 2px solid var(--warning);
}

.preview-panel {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
  background: var(--bg-primary);
  display: none;
}

.preview-panel.visible {
  display: block;
}

/* 分栏模式（宽度由 JS 动态控制） */
.editor-content.split .CodeMirror {
  flex: none;
  width: 50%;
  border-right: none;
}

.editor-content.split .preview-panel {
  flex: 1;
  display: block;
}

/* ==================== 目录面板 ==================== */
.toc-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 240px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 10;
}

.toc-panel.visible {
  transform: translateX(0);
}

.toc-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
}

.toc-close {
  font-size: 14px;
  padding: 4px;
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.toc-item {
  display: block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.15s;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.toc-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.toc-item.toc-h1 { padding-left: 12px; font-weight: 600; font-size: 14px; }
.toc-item.toc-h2 { padding-left: 24px; }
.toc-item.toc-h3 { padding-left: 36px; color: var(--text-secondary); }

/* ==================== 底部状态栏 ==================== */
.status-bar {
  height: 28px;
  padding: 0 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.status-sep {
  color: var(--border);
}

/* ==================== Markdown 预览样式 ==================== */
.preview-panel h1,
.preview-panel h2,
.preview-panel h3,
.preview-panel h4,
.preview-panel h5,
.preview-panel h6 {
  color: var(--text-primary);
  margin: 1.2em 0 0.6em;
  font-weight: 700;
}

.preview-panel h1 { font-size: 1.8em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.preview-panel h2 { font-size: 1.5em; border-bottom: 1px solid var(--border); padding-bottom: 0.2em; }
.preview-panel h3 { font-size: 1.25em; }

.preview-panel p {
  margin: 0.8em 0;
  line-height: 1.8;
}

.preview-panel code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.9em;
}

.preview-panel pre {
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1em 0;
}

.preview-panel pre code {
  background: none;
  padding: 0;
}

.preview-panel blockquote {
  border-left: 4px solid var(--accent);
  margin: 1em 0;
  padding: 8px 16px;
  background: rgba(137, 180, 250, 0.05);
  color: var(--text-secondary);
}

[data-theme="light"] .preview-panel blockquote {
  background: rgba(13, 110, 253, 0.05);
}

.preview-panel ul,
.preview-panel ol {
  margin: 0.8em 0;
  padding-left: 2em;
}

.preview-panel li {
  margin: 0.3em 0;
  line-height: 1.7;
}

.preview-panel img {
  max-width: 100%;
  border-radius: 8px;
}

.preview-panel table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}

.preview-panel th,
.preview-panel td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.preview-panel th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

.preview-panel hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

.preview-panel a {
  color: var(--accent);
}

/* ==================== 滚动条 ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

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

/* ==================== 响应式 / 移动端适配 ==================== */

/* 平板 */
@media (max-width: 1024px) {
  :root { --sidebar-width: 240px; }
  .md-toolbar { gap: 2px; }
  .md-btn { padding: 3px 6px; font-size: 12px; min-width: 22px; }
  .help-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
    --header-height: 50px;
  }

  /* 头部压缩 */
  .header { padding: 0 10px; gap: 8px; }
  .logo { font-size: 16px; }
  .search-input { max-width: 140px; font-size: 13px; }
  .header-right { gap: 4px; }
  .header-right .btn-icon { padding: 6px; font-size: 15px; }
  #newDocBtn { padding: 6px 10px; font-size: 12px; }

  /* 侧边栏浮动覆盖 */
  .sidebar {
    position: fixed;
    z-index: 100;
    height: calc(100vh - var(--header-height));
    top: var(--header-height);
    left: 0;
    width: 280px;
    min-width: 280px;
    box-shadow: 2px 0 16px rgba(0,0,0,0.4);
    transform: translateX(0);
    transition: transform 0.3s ease;
  }
  .sidebar.collapsed {
    transform: translateX(-100%);
    margin-left: 0;
  }

  /* 编辑器工具栏简化 */
  .editor-toolbar { padding: 8px 10px; flex-wrap: wrap; }
  .doc-title-input { width: 160px; font-size: 14px; }
  .toolbar-right { gap: 4px; }
  .toolbar-right .category-select { font-size: 11px; padding: 3px 6px; }
  .save-status { font-size: 10px; min-width: 40px; }

  /* 格式工具栏横向滚动 */
  .md-toolbar {
    padding: 4px 8px;
    gap: 1px;
  }
  .md-btn { padding: 3px 5px; font-size: 11px; min-width: 20px; }
  .md-sep { margin: 0 2px; height: 14px; }

  /* 模式标签 */
  .mode-tabs { padding: 4px 8px; }
  .tab { padding: 4px 10px; font-size: 12px; }

  /* 编辑器 */
  /* 编辑器和工具栏 */
  .editor-content { flex-direction: column; }
  .editor-content.split .CodeMirror {
    flex: none;
    height: 50% !important;
    width: 100% !important;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .editor-content.split .preview-panel { flex: 1; height: 50%; }
  .editor-content.split .split-handle { display: none; }
  .CodeMirror { font-size: 14px !important; line-height: 1.6 !important; }

  /* 预览 */
  .preview-panel { padding: 16px; font-size: 14px; }

  /* 目录面板 */
  .toc-panel { width: 220px; }

  /* 状态栏 */
  .status-bar { padding: 0 8px; gap: 4px; font-size: 10px; overflow-x: auto; white-space: nowrap; }
  .slash-hint { display: none; }

  /* 弹窗 */
  .modal-card { width: 92vw; padding: 0; }
  .modal-header { padding: 16px 16px 0; }
  .modal-body { padding: 8px 16px 4px; }
  .modal-footer { padding: 14px 16px; }

  /* 帮助面板 */
  .help-panel { padding: 16px; }
  .help-grid { grid-template-columns: repeat(2, 1fr); gap: 0 12px; }
  .help-item { font-size: 11px; }
  .help-tabs { flex-wrap: wrap; }

  /* Mermaid 语法 */
  .mermaid-guide { grid-template-columns: 1fr; }

  /* 登录 */
  .login-card { padding: 30px 24px; }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .header-right #exportBtn,
  .header-right #importBtn,
  .header-right #fullscreenBtn { display: none; }
  .header-right #helpBtn { display: none; }
  .doc-title-input { width: 120px; }
  .toolbar-right .category-select { display: none; }
  .help-grid { grid-template-columns: 1fr; }
  .quick-filter-bar { gap: 3px; }
  .quick-filter { padding: 2px 7px; font-size: 10px; }
}

/* ==================== 空状态/编辑器切换 ==================== */
.empty-state ~ .editor-wrapper {
  display: none !important;
}
.empty-state.hidden ~ .editor-wrapper {
  display: flex !important;
}

/* ==================== 全屏模式 ==================== */
.editor-wrapper.fullscreen {
  position: fixed;
  z-index: 999;
  inset: 0;
  background: var(--bg-primary);
}

/* ==================== Slash 命令面板 ==================== */
.slash-palette {
  position: fixed;
  z-index: 9900;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  width: 320px;
  max-height: 380px;
  display: none;
  flex-direction: column;
  overflow: hidden;
}

.slash-palette.visible {
  display: flex;
}

.slash-search {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  gap: 8px;
}

.slash-icon {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.slash-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.slash-input::placeholder {
  color: var(--text-secondary);
}

.slash-list {
  overflow-y: auto;
  padding: 6px;
}

.slash-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.1s;
}

.slash-item:hover,
.slash-item.active {
  background: var(--bg-tertiary);
}

.slash-item .slash-cmd-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: 6px;
  font-size: 14px;
  flex-shrink: 0;
}

.slash-item .slash-cmd-label {
  font-weight: 500;
  color: var(--text-primary);
}

.slash-item .slash-cmd-desc {
  font-size: 11px;
  color: var(--text-secondary);
  margin-left: auto;
}

.slash-item .slash-cmd-shortcut {
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg-primary);
  padding: 1px 5px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ==================== 空状态快捷入口 ==================== */
.quick-start {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.empty-state kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 13px;
  font-family: inherit;
  color: var(--accent);
}

/* ==================== 收藏按钮 ==================== */
.favorite-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 4px;
}

.favorite-btn.active {
  color: #f9e2af;
}

/* ==================== Mermaid 图表 ==================== */
.preview-panel .mermaid {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 1em 0;
  text-align: center;
  overflow-x: auto;
}

.preview-panel .mermaid svg {
  max-width: 100%;
}

.mermaid-error {
  color: var(--danger);
  font-size: 12px;
  padding: 8px;
}

/* ==================== Slash 提示 ==================== */
.slash-hint {
  font-size: 10px;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* ==================== Mermaid 语法指南 ==================== */
.mermaid-guide {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.mermaid-section {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.mermaid-section h3 {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 8px;
}

.mermaid-section pre {
  margin: 0;
  padding: 8px;
  background: var(--bg-tertiary);
  border-radius: 6px;
  font-size: 11px;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.5;
}

.mermaid-section code {
  color: var(--text-secondary);
  font-family: 'Fira Code', 'Consolas', monospace;
}

.mermaid-note {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 4px;
}

.mermaid-note a {
  color: var(--accent);
}

@media (max-width: 600px) {
  .mermaid-guide { grid-template-columns: 1fr; }
}

/* ==================== 通用弹窗 Modal ==================== */
.modal-overlay {
  position: fixed;
  z-index: 10000;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  width: 420px;
  max-width: 92vw;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
  transform: translateY(8px);
  transition: transform 0.2s;
  overflow: hidden;
}

.modal-overlay.visible .modal-card {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-title {
  font-size: 17px;
  font-weight: 600;
}

.modal-close {
  color: var(--text-secondary);
  font-size: 16px;
}

.modal-body {
  padding: 12px 24px 4px;
}

.modal-message {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.modal-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  margin-top: 12px;
  transition: border-color 0.2s;
}

.modal-input:focus {
  border-color: var(--accent);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 20px 24px;
}

.modal-btn-cancel {
  min-width: 72px;
  justify-content: center;
}

.modal-btn-confirm {
  min-width: 72px;
  justify-content: center;
}

.modal-btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.modal-btn-danger:hover {
  background: #e06c88;
}

/* ==================== 版本历史面板 ==================== */
.versions-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 10;
}

.versions-panel.visible {
  transform: translateX(0);
}

.versions-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
}

.versions-close {
  font-size: 14px;
  padding: 4px;
}

.versions-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.version-item {
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  border: 1px solid transparent;
  transition: background 0.15s;
}

.version-item:hover {
  background: var(--bg-tertiary);
}

.version-item.active {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}

.version-item .version-time {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.version-item .version-title {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.version-item .version-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.version-item .version-actions button {
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
}

.version-item .version-actions button:hover {
  background: var(--accent);
  color: #fff;
}

/* ==================== 快捷切换浮层 ==================== */
.switcher-overlay {
  position: fixed;
  z-index: 9900;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s;
}

.switcher-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.switcher-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  width: 400px;
  max-width: 90vw;
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.switcher-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  margin-bottom: 4px;
}

.switcher-input:focus {
  border-color: var(--accent);
}

.switcher-list {
  max-height: 260px;
  overflow-y: auto;
}

.switcher-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}

.switcher-item:hover,
.switcher-item.active {
  background: var(--bg-tertiary);
}

.switcher-item .sw-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.switcher-item .sw-cat {
  font-size: 11px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* ==================== 侧边栏行内重命名 ==================== */
.doc-item .rename-input {
  width: 100%;
  padding: 2px 4px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  outline: none;
  font-family: inherit;
}

/* ==================== 右键菜单 ==================== */
.context-menu {
  position: fixed;
  z-index: 10001;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  min-width: 160px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  display: none;
}

.context-menu.visible {
  display: block;
}

.ctx-item {
  padding: 7px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-primary);
  transition: background 0.1s;
  white-space: nowrap;
}

.ctx-item:hover {
  background: var(--bg-tertiary);
}

.ctx-danger {
  color: var(--danger);
}

.ctx-danger:hover {
  background: rgba(243, 139, 168, 0.15);
}

.ctx-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 8px;
}

/* ==================== 拖拽导入遮罩 ==================== */
.drop-overlay {
  position: fixed;
  z-index: 9999;
  inset: 0;
  background: rgba(137, 180, 250, 0.1);
  border: 3px dashed var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s;
}

.drop-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.drop-hint {
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 24px 40px;
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

/* ==================== 目录树视图 ==================== */
.tree-section {
  margin-bottom: 2px;
}

.tree-category {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: background 0.15s;
}

.tree-category:hover {
  background: var(--bg-tertiary);
}

.tree-category .tree-arrow {
  font-size: 10px;
  transition: transform 0.2s;
  width: 14px;
  text-align: center;
}

.tree-category .tree-count {
  font-size: 11px;
  color: var(--text-secondary);
  margin-left: auto;
}

.tree-children {
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.tree-children.collapsed {
  max-height: 0 !important;
}

.tree-children .doc-item {
  padding-left: 24px;
}

/* ==================== 侧边栏首行筛选增强 ==================== */
.quick-filter-bar {
  padding: 6px 16px;
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--border);
}

/* ==================== 专注模式 ==================== */
.editor-wrapper.focus-mode .CodeMirror {
  opacity: 0.4;
  transition: opacity 0.3s;
}

.editor-wrapper.focus-mode .CodeMirror-activeline {
  opacity: 1 !important;
}

.editor-wrapper.focus-mode .CodeMirror-activeline .CodeMirror-activeline-background {
  background: rgba(137, 180, 250, 0.12) !important;
}

.editor-wrapper.focus-mode .editor-toolbar,
.editor-wrapper.focus-mode .md-toolbar,
.editor-wrapper.focus-mode .mode-tabs,
.editor-wrapper.focus-mode .status-bar {
  opacity: 0.5;
  transition: opacity 0.3s;
}

.editor-wrapper.focus-mode .editor-toolbar:hover,
.editor-wrapper.focus-mode .md-toolbar:hover,
.editor-wrapper.focus-mode .mode-tabs:hover,
.editor-wrapper.focus-mode .status-bar:hover {
  opacity: 1;
}

/* ==================== Callout 提示块 ==================== */
.preview-panel .callout {
  padding: 14px 18px;
  border-radius: 8px;
  margin: 1em 0;
  border-left: 4px solid;
  font-size: 14px;
  line-height: 1.7;
}

.preview-panel .callout-info {
  background: rgba(137, 180, 250, 0.1);
  border-color: var(--accent);
}

.preview-panel .callout-warning {
  background: rgba(249, 226, 175, 0.1);
  border-color: var(--warning);
}

.preview-panel .callout-success {
  background: rgba(166, 227, 161, 0.1);
  border-color: var(--success);
}

.preview-panel .callout-danger {
  background: rgba(243, 139, 168, 0.1);
  border-color: var(--danger);
}

.preview-panel .callout-title {
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==================== KaTeX 公式 ==================== */
.preview-panel .katex-display {
  margin: 1em 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.preview-panel .katex {
  font-size: 1.1em;
}

/* ==================== 分栏拖动条 ==================== */
.split-handle {
  width: 6px;
  cursor: col-resize;
  background: var(--border);
  flex-shrink: 0;
  display: none;
  transition: background 0.15s;
  position: relative;
}

.split-handle:hover,
.split-handle.dragging {
  background: var(--accent);
}

.split-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 24px;
  background: var(--text-secondary);
  border-radius: 1px;
}

.editor-content.split .split-handle {
  display: block;
}