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

    body {
      background-color: #008080;
      font-family: 'MS Sans Serif', 'Microsoft Sans Serif', Tahoma, Arial, sans-serif;
      font-size: 11px;
      color: #000000;
      min-height: 100vh;
      padding: 16px 0 48px;
    }

    /* ── Window chrome ─────────────────────────────── */
    .app-window {
      width: 820px;
      margin: 0 auto;
      background: #C0C0C0;
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      outline: 1px solid #000000;
    }

    .title-bar {
      background: #000080;
      padding: 3px 3px 3px 6px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .title-bar-left {
      display: flex;
      align-items: center;
      gap: 4px;
      color: #FFFFFF;
      font-weight: bold;
      font-size: 11px;
    }

    .title-icon { font-size: 13px; }

    .title-controls { display: flex; gap: 2px; }

    .wnd-btn {
      width: 16px;
      height: 14px;
      background: #C0C0C0;
      color: #000000;
      font-size: 9px;
      font-weight: bold;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #808080;
      border-right:  1px solid #808080;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: 'MS Sans Serif', Arial, sans-serif;
      line-height: 1;
    }

    .wnd-btn:active {
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
    }

    /* ── Menu bar ──────────────────────────────────── */
    .menu-bar {
      background: #C0C0C0;
      border-bottom: 1px solid #808080;
      display: flex;
      padding: 1px 0;
    }

    .menu-item {
      padding: 3px 8px;
      font-size: 11px;
      cursor: pointer;
      color: #000000;
      text-decoration: none;
      display: block;
    }

    .menu-item:hover,
    .menu-item.active {
      background: #000080;
      color: #FFFFFF;
    }

    .menu-item span.underline { text-decoration: underline; }

    /* ── Toolbar ───────────────────────────────────── */
    .toolbar {
      background: #C0C0C0;
      border-bottom: 1px solid #808080;
      padding: 3px 6px;
      display: flex;
      align-items: center;
      gap: 2px;
    }

    .tb-btn {
      min-width: 22px;
      height: 22px;
      background: #C0C0C0;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #808080;
      border-right:  1px solid #808080;
      padding: 0 4px;
      cursor: pointer;
      font-size: 11px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: inherit;
      color: #000000;
      gap: 2px;
    }

    .tb-btn:active {
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
    }

    .tb-sep {
      width: 1px;
      height: 18px;
      background: #808080;
      margin: 0 3px;
      border-right: 1px solid #FFFFFF;
    }

    .tb-label { font-size: 11px; padding: 0 4px 0 6px; }

    .tb-search {
      background: #FFFFFF;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
      padding: 2px 4px;
      font-size: 11px;
      font-family: inherit;
      color: #000000;
      width: 160px;
    }

    .tb-search:focus { outline: none; }

    /* ── Workspace layout ──────────────────────────── */
    .workspace {
      display: flex;
      height: 480px;
    }

    /* ── Tree sidebar ──────────────────────────────── */
    .tree-sidebar {
      width: 170px;
      flex-shrink: 0;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #FFFFFF;
      border-right:  2px solid #FFFFFF;
      margin: 4px 2px 4px 4px;
      background: #FFFFFF;
      overflow-y: auto;
      overflow-x: hidden;
    }

    .tree-cat {
      display: flex;
      align-items: center;
      gap: 3px;
      padding: 2px 4px;
      cursor: pointer;
      background: #C0C0C0;
      border-bottom: 1px solid #808080;
      font-weight: bold;
      font-size: 11px;
      user-select: none;
    }

    .tree-cat:hover { background: #D0D0D0; }

    .tree-cat .arrow { font-size: 8px; width: 10px; }

    .tree-items { display: block; }
    .tree-items.collapsed { display: none; }

    .tree-item {
      display: flex;
      align-items: center;
      gap: 4px;
      padding: 2px 4px 2px 18px;
      cursor: pointer;
      font-size: 11px;
      white-space: nowrap;
      color: #000000;
      text-decoration: none;
      border-bottom: 1px solid #E8E8E8;
    }

    .tree-item:hover {
      background: #000080;
      color: #FFFFFF;
    }

    .tree-item.selected {
      background: #000080;
      color: #FFFFFF;
    }

    .tree-item .ti { font-size: 11px; }

    /* ── Content panel ─────────────────────────────── */
    .content-panel {
      flex: 1;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #FFFFFF;
      border-right:  2px solid #FFFFFF;
      margin: 4px 4px 4px 2px;
      background: #C0C0C0;
      overflow-y: auto;
      overflow-x: hidden;
    }

    /* ── Status bar ────────────────────────────────── */
    .status-bar {
      border-top: 1px solid #808080;
      padding: 2px 6px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 11px;
      background: #C0C0C0;
    }

    .status-cell {
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
      padding: 1px 8px;
      min-width: 80px;
    }

    /* ── Home: Control Panel grid ──────────────────── */
    #view-home {
      padding: 8px;
    }

    .cp-section-label {
      font-weight: bold;
      font-size: 11px;
      padding: 4px 2px 2px;
      margin-top: 6px;
      border-bottom: 1px solid #808080;
      margin-bottom: 4px;
    }

    .cp-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2px;
      padding: 2px;
    }

    .cp-icon {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 72px;
      padding: 6px 4px;
      cursor: pointer;
      text-align: center;
      gap: 4px;
    }

    .cp-icon:hover { background: #000080; color: #FFFFFF; }
    .cp-icon:hover .cp-icon-label { color: #FFFFFF; }

    .cp-icon-img {
      width: 32px;
      height: 32px;
      font-size: 22px;
      display: flex;
      align-items: center;
      justify-content: center;
      image-rendering: pixelated;
    }

    .cp-icon-label {
      font-size: 11px;
      color: #000000;
      line-height: 1.2;
      word-break: break-word;
    }

    /* ── Tool panel (dialog style) ─────────────────── */
    .tool-panel { display: none; padding: 8px 10px; }
    .tool-panel.active { display: block; }

    .dialog-title {
      font-weight: bold;
      font-size: 12px;
      border-bottom: 1px solid #808080;
      padding-bottom: 4px;
      margin-bottom: 8px;
    }

    /* Group box */
    .groupbox {
      border: 1px solid #808080;
      border-top-color: #808080;
      margin: 8px 0;
      padding: 10px 8px 8px;
      position: relative;
    }

    .groupbox-title {
      position: absolute;
      top: -7px;
      left: 8px;
      background: #C0C0C0;
      padding: 0 4px;
      font-size: 11px;
      font-weight: bold;
    }

    /* Form elements */
    .form-row {
      display: flex;
      gap: 8px;
      margin-bottom: 6px;
      align-items: flex-start;
    }

    .form-col { flex: 1; }

    .field-label {
      display: block;
      font-size: 11px;
      margin-bottom: 2px;
      font-weight: bold;
    }

    textarea,
    input[type="text"],
    input[type="number"],
    input[type="date"],
    select {
      background: #FFFFFF;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #DFDFDF;
      border-right:  2px solid #DFDFDF;
      padding: 2px 4px;
      font-size: 11px;
      font-family: 'MS Sans Serif', 'Microsoft Sans Serif', Tahoma, Arial, sans-serif;
      color: #000000;
      width: 100%;
    }

    textarea {
      font-family: 'Courier New', 'Courier', monospace;
      resize: vertical;
      min-height: 100px;
    }

    input[type="text"]:focus,
    input[type="number"]:focus,
    input[type="date"]:focus,
    select:focus,
    textarea:focus { outline: 1px dotted #000000; outline-offset: -2px; }

    /* Buttons */
    .btn {
      background: #C0C0C0;
      color: #000000;
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      padding: 3px 12px;
      font-size: 11px;
      font-family: 'MS Sans Serif', 'Microsoft Sans Serif', Tahoma, Arial, sans-serif;
      cursor: pointer;
      min-width: 75px;
      text-align: center;
    }

    .btn:active {
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #FFFFFF;
      border-right:  2px solid #FFFFFF;
      padding: 4px 11px 2px 13px;
    }

    .btn:focus { outline: 1px dotted #000000; outline-offset: -4px; }

    .btn.default-btn {
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      outline: 2px solid #000000;
      outline-offset: -3px;
    }

    .btn-row {
      display: flex;
      gap: 4px;
      flex-wrap: wrap;
      margin: 6px 0;
      align-items: center;
    }

    /* Output/display areas */
    .output-box {
      background: #FFFFFF;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #DFDFDF;
      border-right:  2px solid #DFDFDF;
      padding: 4px;
      font-family: 'Courier New', 'Courier', monospace;
      font-size: 11px;
      min-height: 50px;
      white-space: pre-wrap;
      word-break: break-all;
      position: relative;
      color: #000000;
    }

    .copy-btn {
      position: absolute;
      top: 2px;
      right: 2px;
      background: #C0C0C0;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #808080;
      border-right:  1px solid #808080;
      padding: 1px 6px;
      font-size: 10px;
      cursor: pointer;
      font-family: inherit;
    }

    .copy-btn:active {
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
    }

    /* Stats strip */
    .stats-row {
      display: flex;
      gap: 4px;
      flex-wrap: wrap;
      margin-top: 6px;
    }

    .stat-box {
      background: #FFFFFF;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #DFDFDF;
      border-right:  1px solid #DFDFDF;
      padding: 3px 8px;
      text-align: center;
      min-width: 60px;
    }

    .stat-num { font-size: 14px; font-weight: bold; display: block; font-family: 'Courier New', monospace; }
    .stat-lbl { font-size: 9px; text-transform: uppercase; color: #444444; display: block; }

    /* Color preview */
    .color-swatch {
      width: 100%;
      height: 48px;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #DFDFDF;
      border-right:  2px solid #DFDFDF;
      margin-bottom: 6px;
    }

    input[type="color"] {
      width: 32px;
      height: 22px;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #DFDFDF;
      border-right:  1px solid #DFDFDF;
      padding: 1px;
      cursor: pointer;
      background: #C0C0C0;
    }

    input[type="checkbox"] {
      width: 13px;
      height: 13px;
      accent-color: #000080;
      margin-right: 4px;
    }

    input[type="range"] {
      accent-color: #000080;
      width: 100%;
    }

    .check-row {
      display: flex;
      align-items: center;
      margin-bottom: 3px;
      font-size: 11px;
    }

    /* Error text */
    .error-text { color: #800000; font-size: 11px; margin: 2px 0; }

    /* Divider */
    .win-hr {
      border: none;
      border-top: 1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      margin: 8px 0;
    }

    /* Scrollbar */
    ::-webkit-scrollbar { width: 16px; height: 16px; }
    ::-webkit-scrollbar-track { background: #C0C0C0; }
    ::-webkit-scrollbar-thumb {
      background: #C0C0C0;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #808080;
      border-right:  1px solid #808080;
    }
    ::-webkit-scrollbar-button {
      background: #C0C0C0;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #808080;
      border-right:  1px solid #808080;
      display: block;
      height: 16px;
    }

    /* ── Dropdown menus ───────────────────────────── */
    .menu-container { position: relative; display: inline-block; }

    .dropdown {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      background: #C0C0C0;
      border-top:    1px solid #FFFFFF;
      border-left:   1px solid #FFFFFF;
      border-bottom: 1px solid #404040;
      border-right:  1px solid #404040;
      outline: 1px solid #000000;
      min-width: 200px;
      z-index: 8000;
      padding: 2px 0;
    }

    .dropdown.open { display: block; }

    .dropdown-item {
      padding: 3px 32px 3px 22px;
      cursor: pointer;
      font-size: 11px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: #000000;
      white-space: nowrap;
      user-select: none;
    }

    .dropdown-item:hover { background: #000080; color: #FFFFFF; }

    .dropdown-item.disabled {
      color: #808080;
      cursor: default;
      pointer-events: none;
    }

    .dropdown-check { width: 16px; flex-shrink: 0; font-size: 10px; }
    .dropdown-right  { margin-left: 24px; font-size: 10px; color: inherit; }

    .dropdown-sep {
      height: 1px;
      background: #808080;
      margin: 2px 3px;
      border-bottom: 1px solid #FFFFFF;
    }

    .dropdown-heading {
      padding: 2px 8px;
      font-size: 10px;
      font-weight: bold;
      color: #808080;
      cursor: default;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    /* ── About / modal dialog ──────────────────────── */
    .modal-overlay {
      display: none;
      position: fixed;
      top: 0; left: 0; right: 0; bottom: 0;
      z-index: 9998;
      align-items: center;
      justify-content: center;
    }

    .modal-overlay.open { display: flex; }

    .modal-window {
      background: #C0C0C0;
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      outline: 1px solid #000000;
      width: 360px;
    }

    .modal-title {
      background: #000080;
      color: #FFFFFF;
      padding: 3px 4px 3px 6px;
      font-weight: bold;
      font-size: 11px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .modal-body {
      padding: 16px;
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }

    .modal-icon { font-size: 40px; flex-shrink: 0; line-height: 1; }

    .modal-text { font-size: 11px; line-height: 1.7; }
    .modal-text b { font-size: 13px; display: block; margin-bottom: 4px; }

    .modal-footer {
      padding: 8px 12px 10px;
      border-top: 1px solid #808080;
      display: flex;
      justify-content: center;
      gap: 6px;
    }

    /* ── Shortcuts dialog ──────────────────────────── */
    .shortcuts-table { width: 100%; border-collapse: collapse; font-size: 11px; }
    .shortcuts-table td { padding: 2px 6px; }
    .shortcuts-table tr:nth-child(even) { background: #D4D0C8; }
    .shortcuts-table .kbd {
      font-family: 'Courier New', monospace;
      background: #FFFFFF;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
      padding: 0 4px;
      font-size: 10px;
    }

    /* Regex highlight */
    mark.rx { background: #000080; color: #FFFFFF; }

    /* Markdown preview output */
    #mdPreview {
      background: #FFFFFF;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #DFDFDF;
      border-right:  2px solid #DFDFDF;
      padding: 6px;
      min-height: 200px;
      overflow-y: auto;
      font-size: 12px;
      line-height: 1.5;
      font-family: Times New Roman, serif;
    }

    #mdPreview h1,#mdPreview h2,#mdPreview h3 { font-family: Arial, sans-serif; margin: 4px 0; }
    #mdPreview h1 { font-size: 16px; }
    #mdPreview h2 { font-size: 14px; }
    #mdPreview h3 { font-size: 12px; }
    #mdPreview p { margin: 4px 0; }
    #mdPreview ul { margin-left: 16px; }
    #mdPreview code { font-family: 'Courier New', monospace; background: #E8E8E8; padding: 0 2px; }
    #mdPreview blockquote { border-left: 3px solid #808080; margin-left: 8px; padding-left: 6px; color: #444; }
    #mdPreview a { color: #000080; }

    /* Taskbar */
    .taskbar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 28px;
      background: #C0C0C0;
      border-top: 2px solid #FFFFFF;
      display: flex;
      align-items: center;
      padding: 0 4px;
      gap: 4px;
      z-index: 9999;
    }

    .start-btn {
      background: #C0C0C0;
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      padding: 2px 8px;
      font-weight: bold;
      font-size: 11px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      font-family: inherit;
    }

    .taskbar-sep { width: 1px; height: 18px; background: #808080; border-right: 1px solid #FFFFFF; margin: 0 4px; }

    .taskbar-task {
      background: #C0C0C0;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
      padding: 2px 10px;
      font-size: 11px;
      cursor: pointer;
      font-family: inherit;
    }

    .taskbar-clock {
      margin-left: auto;
      border-top:    1px solid #808080;
      border-left:   1px solid #808080;
      border-bottom: 1px solid #FFFFFF;
      border-right:  1px solid #FFFFFF;
      padding: 2px 8px;
      font-size: 11px;
      min-width: 50px;
      text-align: center;
    }

    /* Unit sub-panels */
    .unit-result-box {
      background: #FFFFFF;
      border-top:    2px solid #808080;
      border-left:   2px solid #808080;
      border-bottom: 2px solid #DFDFDF;
      border-right:  2px solid #DFDFDF;
      padding: 6px 8px;
      font-size: 14px;
      font-weight: bold;
      font-family: 'Courier New', monospace;
      text-align: center;
      min-height: 36px;
    }

    .pct-section {
      background: #C0C0C0;
      border-top:    2px solid #FFFFFF;
      border-left:   2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right:  2px solid #808080;
      padding: 6px 8px;
      margin-bottom: 6px;
    }

    .pct-label { font-weight: bold; margin-bottom: 4px; font-size: 11px; }

    /* ── Mobile / responsive ───────────────────────── */
    @media (max-width: 760px) {
      body { padding: 4px 0 34px; }

      .app-window {
        width: auto;
        margin: 0 4px;
      }

      /* Window title can be long — keep it from pushing controls off */
      .title-bar-left { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

      /* Toolbar: drop quick-launch buttons, let search fill the row */
      .tb-quick { display: none; }
      .tb-label { display: none; }
      .tb-search { flex: 1; width: auto; min-width: 0; }

      /* Stack the sidebar above the content instead of beside it */
      .workspace { flex-direction: column; height: auto; }

      .tree-sidebar {
        width: auto;
        margin: 4px;
        max-height: 168px;
      }

      .content-panel {
        margin: 0 4px 4px;
        height: auto;
        min-height: 60vh;
      }

      /* Stack two-column form rows */
      .form-row { flex-direction: column; align-items: stretch !important; }
      .form-row > div[style*="width:"] { width: auto !important; }

      /* Markdown editor: stack source over preview with usable heights */
      #view-markdown .form-row { height: auto !important; }
      #view-markdown textarea { height: 180px !important; }
      #view-markdown #mdPreview { min-height: 180px; }

      /* Dropdown menus must not exceed the viewport */
      .dropdown {
        max-width: calc(100vw - 16px);
        max-height: 70vh;
        overflow-y: auto;
      }

      /* Modals fit small screens */
      .modal-window { width: 340px !important; max-width: calc(100vw - 24px); }

      /* Status bar wraps gracefully */
      .status-bar { flex-wrap: wrap; }

      /* Home icons a touch larger for easier tapping */
      .cp-icon { width: 84px; }
    }

    @media (max-width: 420px) {
      .menu-item { padding: 3px 6px; }
      .cp-grid { justify-content: space-around; }
      .cp-icon { width: 30%; }
    }

    /* ── Product Hunt badge (Win95-framed) ─────────── */
    .ph-badge {
      float: right;
      margin: 2px 0 10px 14px;
      text-align: center;
      background: #C0C0C0;
      border-top: 2px solid #FFFFFF;
      border-left: 2px solid #FFFFFF;
      border-bottom: 2px solid #808080;
      border-right: 2px solid #808080;
      padding: 4px 4px 5px;
    }
    .ph-badge-label { font-size: 10px; font-weight: bold; margin-bottom: 3px; }
    .ph-badge img { display: block; border: 1px solid #808080; }
    @media (max-width: 760px) {
      .ph-badge { float: none; margin: 0 auto 10px; display: table; }
    }
  
    /* link-based nav (per-tool pages) */
    a.dropdown-item, a.tb-btn, a.cp-icon { text-decoration: none; color: #000000; }
    a.tb-btn { display: flex; align-items: center; justify-content: center; }