.lengyi-app {
      /* 鑹插僵绯荤粺锛氫綆楗卞拰闈涜摑绱?+ 涓€х伆 */
      --bg: #f7f8fa;
      --panel-bg: #ffffff;
      --surface: #f3f5f8;
      --surface-hover: #ebeef3;
      --text: #1a1d23;
      --text-secondary: #5f6775;
      --text-muted: #8a93a1;
      --border: rgba(0, 0, 0, 0.08);
      --accent: #4f46e5;
      --accent-hover: #4338ca;
      --accent-soft: rgba(79, 70, 229, 0.1);
      --code-bg: #1e1e2e;
      --code-text: #e4e4e7;
      --danger: #ef4444;

      /* 阴影：分层柔和 */
      --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
      --shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);

      /* 瀛椾綋锛氫紭鍏堢郴缁熷瓧浣擄紝绂荤嚎鍙敤 */
      --font-sans: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Consolas, Menlo, monospace;
      --font-editor: "SF Pro Text", "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;

      /* 鍦嗚 */
      --radius-sm: 6px;
      --radius: 10px;
      --radius-lg: 14px;
      --radius-xl: 18px;
    }
    .lengyi-app[data-theme="dark"] {
      --bg: #0b0d12;
      --panel-bg: #151821;
      --surface: #1c1f2a;
      --surface-hover: #252a38;
      --text: #f0f2f7;
      --text-secondary: #a5adb8;
      --text-muted: #6b7280;
      --border: rgba(255, 255, 255, 0.08);
      --accent: #818cf8;
      --accent-hover: #a5b4fc;
      --accent-soft: rgba(129, 140, 248, 0.15);
      --code-bg: #0f1115;
      --code-text: #e4e4e7;
      --danger: #f87171;

      --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
      --shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
      --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
    }
    * { box-sizing: border-box; }
    .lengyi-app {
      margin: 0;
      padding: 0;
      height: 100%;
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      overflow: hidden;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    ::selection {
      background: var(--accent-soft);
      color: var(--text);
    }
    .lengyi-app {
      display: flex;
      flex-direction: column;
      height: calc(100vh - 56px);
    }
    /* SVG 图标基线对齐 */
    .icon {
      width: 16px;
      height: 16px;
      flex-shrink: 0;
      fill: none;
      stroke: currentColor;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .icon-sm { width: 14px; height: 14px; }
    .icon-lg { width: 18px; height: 18px; }

    /* 椤堕儴鏍?*/
    .top-bar {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 8px 14px;
      background: var(--panel-bg);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      flex-wrap: wrap;
      z-index: 10;
    }
    .top-bar .brand {
      font-weight: 700;
      font-size: 16px;
      letter-spacing: -0.01em;
      margin-right: 10px;
      color: var(--text);
      white-space: nowrap;
    }
    .top-bar input[type="text"] {
      flex: 0 1 220px;
      min-width: 120px;
      padding: 6px 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg);
      color: var(--text);
      font-size: 14px;
      font-weight: 500;
      outline: none;
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    .top-bar input[type="text"]:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-soft);
    }
    .top-bar .spacer { flex: 1; }
    .top-actions {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .top-bar button, .top-bar label,
    .editor-toolbar button, .editor-toolbar label {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 12px;
      border: none;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--text-secondary);
      font-size: 13px;
      font-weight: 500;
      cursor: pointer;
      transition: all .2s ease;
      user-select: none;
      white-space: nowrap;
    }
    .top-bar button:hover, .top-bar label:hover,
    .editor-toolbar button:hover, .editor-toolbar label:hover {
      background: var(--surface);
      color: var(--accent);
    }
    .top-bar button.primary, .editor-toolbar button.primary {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
    }
    .top-bar button.primary:hover, .editor-toolbar button.primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 10px rgba(79, 70, 229, 0.25);
    }
    .top-bar input[type="file"], .editor-toolbar input[type="file"] { display: none; }
    .dropdown {
      position: relative;
      display: inline-flex;
    }
    .dropdown-menu {
      position: absolute;
      top: 100%;
      left: 0;
      margin-top: 8px;
      background: var(--panel-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      min-width: 180px;
      display: none;
      flex-direction: column;
      z-index: 100;
      overflow: hidden;
      padding: 6px;
      animation: menuIn .2s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .top-actions .dropdown-menu {
      left: auto;
      right: 0;
    }
    .dropdown-menu.show {
      display: flex;
    }
    .dropdown-item {
      padding: 8px 12px;
      cursor: pointer;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
      transition: background .15s ease, color .15s ease;
      white-space: nowrap;
    }
    .dropdown-item:hover {
      background: var(--accent-soft);
      color: var(--accent);
    }
    .top-bar .divider, .editor-toolbar .divider {
      width: 1px;
      height: 18px;
      background: var(--border);
      margin: 0 4px;
    }
    /* 编辑器工具栏 */
    .editor-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 8px 14px;
      background: var(--bg);
      border-bottom: 1px solid var(--border);
      flex-wrap: wrap;
    }
    .editor-toolbar .format-group,
    .editor-toolbar .editor-actions {
      display: flex;
      align-items: center;
      gap: 4px;
      flex-wrap: wrap;
      padding: 4px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }
    .editor-toolbar button {
      padding: 5px;
      border-radius: var(--radius-sm);
    }
    .editor-toolbar button svg.icon {
      width: 15px;
      height: 15px;
    }
    .editor-toolbar button b,
    .editor-toolbar button i,
    .editor-toolbar button u,
    .editor-toolbar button s {
      font-size: 13px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 15px;
    }
    /* 表格选择器 */
    .table-selector-menu {
      padding: 12px;
      min-width: auto;
    }
    .table-grid {
      display: grid;
      grid-template-columns: repeat(8, 22px);
      grid-template-rows: repeat(8, 22px);
      gap: 3px;
    }
    .table-grid-cell {
      width: 22px;
      height: 22px;
      border: 1px solid var(--border);
      border-radius: 4px;
      cursor: pointer;
      background: var(--panel-bg);
      transition: background .1s ease, border-color .1s ease;
    }
    .table-grid-cell:hover,
    .table-grid-cell.active {
      background: var(--accent);
      border-color: var(--accent);
    }
    .table-size-label {
      text-align: center;
      margin-top: 8px;
      font-size: 12px;
      color: var(--text-muted);
    }
    /* 涓荤紪杈戝尯 */
    .main {
      display: flex;
      flex: 1;
      overflow: hidden;
      position: relative;
    }
    .pane {
      flex: 1;
      display: flex;
      flex-direction: column;
      min-width: 0;
      overflow: hidden;
      transition: flex 0.25s ease, max-width 0.25s ease, opacity 0.2s ease;
    }
    .pane-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 40px;
      padding: 8px 16px;
      background: var(--panel-bg);
      border-bottom: 1px solid var(--border);
      font-size: 12px;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      gap: 12px;
    }
    .pane-title {
      font-weight: 600;
    }
    .collapse-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      color: var(--text-muted);
      cursor: pointer;
      padding: 4px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      line-height: 1;
      transition: color .15s ease, background .15s ease, transform .2s ease;
    }
    .collapse-btn:hover {
      color: var(--accent);
      background: var(--surface);
    }
    .pane.collapsed {
      flex: 0 0 44px !important;
      min-width: 44px;
      max-width: 44px;
      opacity: 1;
    }
    .pane.collapsed .pane-header {
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 14px 8px;
      height: 100%;
      gap: 10px;
    }
    .pane.collapsed .pane-title {
      writing-mode: vertical-rl;
      text-orientation: mixed;
      white-space: nowrap;
      margin: 4px 0;
    }
    .pane.collapsed .pane-header > *:not(.pane-title):not(.collapse-btn) {
      display: none;
    }
    .resizer {
      width: 8px;
      background: transparent;
      cursor: col-resize;
      transition: background 0.2s ease;
      flex: 0 0 8px;
      z-index: 5;
      position: relative;
    }
    .resizer:hover {
      background: var(--accent-soft);
    }
    .resizer.dragging {
      background: var(--accent-soft);
    }
    .resizer::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 2px;
      height: 32px;
      background: var(--border);
      border-radius: 2px;
      transition: background 0.2s ease, height 0.2s ease;
    }
    .resizer:hover::after,
    .resizer.dragging::after {
      background: var(--accent);
      height: 48px;
    }
    .resizer.hidden {
      display: none;
    }
    .resizing .pane,
    .resizing .resizer {
      transition: none !important;
    }
    .editor-pane textarea {
      flex: 1;
      width: 100%;
      padding: 28px 32px;
      border: none;
      outline: none;
      resize: none;
      font-family: var(--font-editor);
      font-size: 16px;
      line-height: 1.8;
      background: var(--panel-bg);
      color: var(--text);
      caret-color: var(--accent);
      tab-size: 4;
      white-space: pre-wrap;
      word-break: break-all;
    }
    .preview-pane {
      border-left: 1px solid var(--border);
      background: var(--panel-bg);
    }
    .preview-content {
      flex: 1;
      overflow: auto;
      font-family: var(--font-editor);
      font-size: 16px;
      line-height: 1.8;
      color: var(--text);
      width: 100%;
      max-width: none;
      margin: 0;
    }
    .preview-content .markdown-body {
      max-width: 800px;
      margin: 0 auto;
      padding: 32px 40px;
    }
    /* 棰勮鍖烘簮鐮佺紪杈?*/
    .preview-source {
      flex: 1;
      width: 100%;
      padding: 28px 32px;
      border: none;
      outline: none;
      resize: none;
      display: none;
      font-family: var(--font-mono);
      font-size: 15px;
      line-height: 1.7;
      background: var(--panel-bg);
      color: var(--text);
      caret-color: var(--accent);
      tab-size: 4;
      white-space: pre-wrap;
      word-break: break-all;
    }
    .preview-toggle {
      display: flex;
      gap: 4px;
      padding: 3px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
    }
    .toggle-btn {
      padding: 3px 12px;
      border: none;
      border-radius: 5px;
      background: transparent;
      color: var(--text-muted);
      font-size: 12px;
      font-weight: 500;
      cursor: pointer;
      transition: all .15s ease;
    }
    .toggle-btn.active {
      background: var(--panel-bg);
      color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .toggle-btn:hover:not(.active) {
      color: var(--accent);
    }
    /* Markdown 棰勮鏍峰紡 */
    .preview-content h1, .preview-content h2, .preview-content h3,
    .preview-content h4, .preview-content h5, .preview-content h6 {
      margin-top: 48px;
      margin-bottom: 16px;
      font-weight: 600;
      line-height: 1.25;
      color: var(--text);
      letter-spacing: -0.01em;
    }
    .preview-content h1 { font-size: 2.25em; font-weight: 700; letter-spacing: -0.02em; }
    .preview-content h2 { font-size: 1.75em; }
    .preview-content h3 { font-size: 1.4em; }
    .preview-content h4 { font-size: 1.15em; }
    .preview-content p { margin: 0 0 20px; color: var(--text); }
    .preview-content a { color: var(--accent); text-decoration: none; }
    .preview-content a:hover { text-decoration: underline; }
    .preview-content ul, .preview-content ol { margin: 0 0 20px; padding-left: 1.8em; }
    .preview-content li { margin: 6px 0; }
    .preview-content code {
      background: var(--surface);
      padding: 3px 7px;
      border-radius: 5px;
      font-family: var(--font-mono);
      font-size: 0.875em;
      color: var(--accent);
    }
    .preview-content pre {
      background: var(--code-bg);
      color: var(--code-text);
      padding: 18px 22px;
      border-radius: var(--radius);
      overflow-x: auto;
      margin: 0 0 20px;
      box-shadow: var(--shadow-sm);
    }
    .preview-content pre code {
      background: transparent;
      padding: 0;
      color: inherit;
      font-size: 0.9em;
    }
    .preview-content blockquote {
      margin: 0 0 20px;
      padding: 10px 24px;
      border-left: 3px solid var(--text-muted);
      background: transparent;
      color: var(--text-muted);
      font-style: italic;
      font-size: 0.95em;
    }
    .preview-content table {
      border-collapse: collapse;
      width: 100%;
      margin-bottom: 20px;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .preview-content .mermaid {
      margin: 0 0 20px;
      text-align: center;
    }
    .preview-content .mermaid svg {
      max-width: 100%;
      height: auto;
    }
    .preview-content th, .preview-content td {
      border: 1px solid var(--border);
      padding: 10px 14px;
      text-align: left;
    }
    .preview-content th { background: var(--surface); font-weight: 600; color: var(--text); }
    .preview-content img { max-width: 100%; height: auto; border-radius: var(--radius); box-shadow: var(--shadow); }
    [data-theme="dark"] .preview-content img { opacity: 0.95; }
    .preview-content hr {
      border: none;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--border), transparent);
      margin: 40px 0;
    }
    /* 状态栏 */
    .statusbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 5px 16px;
      background: var(--bg);
      border-top: 1px solid var(--border);
      font-size: 12px;
      color: var(--text-muted);
    }
    .statusbar .save-hint { color: var(--accent); opacity: 0; transition: opacity .3s ease; font-weight: 500; }
    .statusbar .save-hint.show { opacity: 1; }
    .statusbar #status-right { opacity: 0.7; }
    /* 妯℃€佹 */
    .modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.35);
      backdrop-filter: blur(4px);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 200;
      padding: 16px;
      opacity: 0;
      transition: opacity .2s ease;
    }
    .modal-overlay.show {
      opacity: 1;
    }
    .modal {
      background: var(--panel-bg);
      color: var(--text);
      border-radius: var(--radius-lg);
      width: 100%;
      max-width: 560px;
      max-height: 86vh;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      overflow: hidden;
      transform: translateY(12px) scale(0.98);
      opacity: 0;
      transition: all .25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .modal-overlay.show .modal {
      transform: translateY(0) scale(1);
      opacity: 1;
    }
    .modal-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
    }
    .modal-header h3 { margin: 0; font-size: 17px; font-weight: 600; display: inline-flex; align-items: center; gap: 8px; }
    .modal-header button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      padding: 4px;
      border-radius: var(--radius-sm);
      color: var(--text-muted);
      cursor: pointer;
      line-height: 1;
      transition: color .15s ease, background .15s ease;
    }
    .modal-header button:hover { color: var(--text); background: var(--surface); }
    .modal-body {
      padding: 18px 20px;
      overflow-y: auto;
      font-size: 14px;
      line-height: 1.7;
    }
    .modal-body p { margin: 0 0 12px; color: var(--text-secondary); }
    .modal-body ul { margin: 8px 0 14px; padding-left: 1.6em; }
    .modal-body li { margin: 5px 0; }
    .modal-body label {
      display: block;
      font-weight: 500;
      margin-bottom: 6px;
      color: var(--text);
      font-size: 13px;
    }
    .modal-body input[type="url"],
    .modal-body textarea,
    .modal-body input[type="text"],
    .modal-body select {
      width: 100%;
      padding: 10px 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg);
      color: var(--text);
      font-size: 14px;
      outline: none;
      margin-bottom: 12px;
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    .modal-body input[type="url"]:focus,
    .modal-body textarea:focus,
    .modal-body input[type="text"]:focus,
    .modal-body select:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-soft);
    }
    .modal-body textarea { font-family: var(--font-mono); resize: vertical; }
    .modal-footer {
      padding: 14px 20px;
      border-top: 1px solid var(--border);
      display: flex;
      justify-content: flex-end;
      gap: 8px;
    }
    .modal-footer button {
      padding: 8px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--panel-bg);
      color: var(--text-secondary);
      font-size: 13px;
      font-weight: 500;
      cursor: pointer;
      transition: all .15s ease;
    }
    .modal-footer button:hover { border-color: var(--accent); color: var(--accent); background: var(--surface); }
    .modal-footer button.primary {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }
    .modal-footer button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
    /* 绉诲姩绔?*/
    @media (max-width: 768px) {
      .top-bar { padding: 8px; gap: 6px; }
      .top-bar .brand { display: none; }
      .top-bar input[type="text"] { flex: 1 1 120px; }
      .editor-toolbar { padding: 6px; gap: 8px; }
      .editor-toolbar .format-group, .editor-toolbar .editor-actions { gap: 3px; padding: 3px; }
      .top-bar button span, .editor-toolbar button span { display: none; }
      .main { flex-direction: column; }
      .preview-pane { border-left: none; border-top: 1px solid var(--border); }
      .pane { flex: 1; height: auto; min-height: 0; }
      .pane.collapsed {
        flex: 0 0 40px !important;
        min-width: auto;
        max-width: none;
        width: 100%;
        height: 40px;
      }
      .pane.collapsed .pane-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: 8px 16px;
        height: 100%;
        writing-mode: horizontal-tb;
      }
      .pane.collapsed .pane-title {
        writing-mode: horizontal-tb;
      }
      .resizer { display: none; }
      .preview-content .markdown-body { padding: 20px 24px; }
    }
    /* 加载提示 */
    .toast {
      position: fixed;
      bottom: 56px;
      left: 50%;
      transform: translateX(-50%) translateY(20px);
      background: rgba(26, 29, 35, 0.92);
      color: #fff;
      padding: 10px 18px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 500;
      opacity: 0;
      pointer-events: none;
      transition: all .3s ease;
      z-index: 100;
      box-shadow: var(--shadow-md);
      backdrop-filter: blur(8px);
    }
    .toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
    /* 鎷栨斁鏂囦欢鎻愮ず閬僵 */
    .drop-overlay {
      position: fixed;
      inset: 0;
      background: rgba(79, 70, 229, 0.06);
      border: 2px dashed var(--accent);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 300;
      pointer-events: none;
      transition: opacity .2s ease;
      opacity: 0;
      backdrop-filter: blur(2px);
    }
    [data-theme="dark"] .drop-overlay {
      background: rgba(129, 140, 248, 0.08);
    }
    .drop-overlay.show {
      display: flex;
      opacity: 1;
    }
    .drop-message {
      color: var(--accent);
      font-size: 18px;
      font-weight: 600;
      padding: 24px 40px;
      border-radius: var(--radius-lg);
      background: var(--panel-bg);
      box-shadow: var(--shadow-lg);
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }
    /* 导出图片 */
    .export-image-stage {
      position: fixed;
      left: -99999px;
      top: 0;
      visibility: visible;
      pointer-events: none;
      z-index: -1;
    }
    .ratio-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
      gap: 8px;
      margin-bottom: 14px;
    }
    .ratio-btn {
      padding: 10px 4px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg);
      color: var(--text-secondary);
      font-size: 13px;
      font-weight: 500;
      cursor: pointer;
      transition: all .15s ease;
      line-height: 1.3;
    }
    .ratio-btn small {
      display: block;
      font-size: 11px;
      color: var(--text-muted);
      font-weight: 400;
      margin-top: 2px;
    }
    .ratio-btn:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: var(--surface);
    }
    .ratio-btn.active {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }
    .ratio-btn.active small {
      color: rgba(255,255,255,0.85);
    }
    .option-row {
      display: flex;
      align-items: center;
      gap: 8px;
      margin: 12px 0 16px;
    }
    .option-row input[type="checkbox"] {
      width: auto;
      margin: 0;
    }
    .option-row label {
      display: inline;
      margin: 0;
      font-weight: normal;
      cursor: pointer;
      color: var(--text-secondary);
    }
    #export-image-preview-wrap {
      min-height: 120px;
      max-height: 420px;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: auto;
      padding: 10px;
    }
    #export-image-preview {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-sm);
    }
    .modal-body .hint {
      margin: 10px 0 0;
      font-size: 12px;
      color: var(--text-muted);
    }
    /* 鎻掑叆鍥剧墖妯℃€佹 */
    .image-modal-tabs {
      display: flex;
      gap: 8px;
      margin-bottom: 14px;
      padding: 4px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
    }
    .image-tab {
      flex: 1;
      padding: 7px 14px;
      border: none;
      border-radius: 6px;
      background: transparent;
      color: var(--text-secondary);
      cursor: pointer;
      font-size: 13px;
      font-weight: 500;
      transition: all .15s ease;
    }
    .image-tab.active {
      background: var(--panel-bg);
      color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .image-tab-panel { display: none; }
    .image-tab-panel.active { display: block; }
    .upload-area {
      border: 2px dashed var(--border);
      border-radius: var(--radius);
      padding: 32px;
      text-align: center;
      color: var(--text-muted);
      cursor: pointer;
      transition: border-color .2s ease, color .2s ease, background .2s ease;
      margin-bottom: 12px;
      position: relative;
      background: var(--surface);
    }
    .upload-area:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
    .upload-area input[type="file"] {
      position: absolute;
      inset: 0;
      opacity: 0;
      cursor: pointer;
      width: 100%;
      height: 100%;
    }
    .upload-preview img {
      max-width: 100%;
      max-height: 200px;
      border-radius: var(--radius);
      margin-bottom: 12px;
      display: block;
      box-shadow: var(--shadow);
    }
    /* 椤甸潰鍏ㄥ睆 */
    .app.page-fullscreen {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      z-index: 1;
    }
    .lengyi-app.page-fullscreen-active { overflow: hidden; }
    /* KaTeX */
    .katex { font-size: 1.1em; }
    .preview-content .katex-display { margin: 16px 0; overflow-x: auto; }
    /* 任务列表 */
    .preview-content input[type="checkbox"] {
      margin-right: 6px;
      vertical-align: middle;
    }
    .preview-content li.task-item {
      list-style: none;
      margin-left: -1.4em;
    }
    .preview-content ul.task-list {
      padding-left: 1.8em;
    }
    /* 宸ュ叿鏍忎笅鎷夋寜閽枃瀛?*/
    .top-bar button, .editor-toolbar button { white-space: nowrap; }
    /* 下拉菜单进入动画 */
    @keyframes menuIn {
      from { opacity: 0; transform: translateY(-6px); }
      to { opacity: 1; transform: translateY(0); }
    }
    /* 打印 / 导出 PDF */
    @media print {
      .top-bar, .editor-toolbar, .statusbar, .editor-pane, .resizer, .preview-pane .pane-header,
      .preview-source, .modal-overlay, .toast, .icon-sprite {
        display: none !important;
      }
      .preview-pane {
        border: none !important;
        flex: 1 1 100% !important;
        max-width: none !important;
        width: 100% !important;
      }
      .preview-content {
        padding: 0 !important;
        overflow: visible !important;
        max-width: none !important;
        color: #000 !important;
      }
      .preview-content .markdown-body {
        max-width: none !important;
        padding: 0 !important;
      }
      .preview-content h1, .preview-content h2, .preview-content h3,
      .preview-content h4, .preview-content h5, .preview-content h6,
      .preview-content p, .preview-content li, .preview-content td, .preview-content th { color: #000 !important; }
      .preview-content pre, .preview-content code { background: #f5f5f5 !important; color: #000 !important; }
      html, body, .app, .main {
        height: auto !important;
        overflow: visible !important;
      }
      body {
        background: #fff !important;
        color: #000 !important;
      }
    }