/**
 * DZ-Calc (جداول الجزائر) — Microsoft Excel & Google Sheets Authentic Styling
 * Ultra-high-fidelity Office Ribbon, Data Grid, Formula Bar, Sheet Tabs, and Status Bar
 */

:root {
  --excel-green: #107c41;
  --excel-green-hover: #0b552c;
  --excel-green-light: #e7f4ea;
  --excel-dark: #004b1c;
  --titlebar-bg: #107c41;
  --ribbon-bg: #ffffff;
  --ribbon-header-bg: #f3f2f1;
  --ribbon-border: #edebe9;
  --ribbon-divider: #e1dfdd;
  --ribbon-btn-hover: #f3f2f1;
  --ribbon-btn-active: #edebe9;
  --grid-border: #d4d4d4;
  --grid-header-bg: #f8f9fa;
  --grid-header-hover: #e8eaed;
  --grid-header-active: #d1fae5;
  --grid-header-text: #444746;
  --cell-text: #1f2937;
  --selection-border: #107c41;
  --selection-bg: rgba(16, 124, 65, 0.12);
  --formula-bar-bg: #ffffff;
  --formula-bar-border: #e1dfdd;
  --statusbar-bg: #f3f2f1;
  --statusbar-text: #444746;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.18);
}

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

body {
  font-family: 'Segoe UI', 'Cairo', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  background-color: #f8fafc;
  color: var(--cell-text);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   1. Microsoft Excel Title Bar
   ========================================================================== */
.excel-titlebar {
  background: var(--titlebar-bg);
  color: #ffffff;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  gap: 16px;
  z-index: 100;
  flex-shrink: 0;
}

.titlebar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.excel-app-icon {
  width: 26px;
  height: 26px;
  background: #ffffff;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 3px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.excel-app-icon img,
.excel-app-icon svg {
  width: 100%;
  height: 100%;
}

/* Quick Access Toolbar */
.quick-access-tools {
  display: flex;
  align-items: center;
  gap: 2px;
}

.qa-btn {
  background: transparent;
  border: none;
  color: #ffffff;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.qa-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.qa-btn:active {
  background: rgba(255, 255, 255, 0.3);
}

.qa-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}

/* AutoSave Pill */
.autosave-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.15);
  padding: 3px 10px;
  border-radius: 14px;
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s;
}

.autosave-pill:hover {
  background: rgba(0, 0, 0, 0.25);
}

.autosave-toggle {
  width: 22px;
  height: 12px;
  background: #34d399;
  border-radius: 6px;
  position: relative;
  transition: background 0.2s;
}

.autosave-toggle::after {
  content: '';
  position: absolute;
  top: 1px;
  right: 1px;
  width: 10px;
  height: 10px;
  background: #ffffff;
  border-radius: 50%;
  transition: transform 0.2s;
}

/* Center Workbook Title & Search */
.titlebar-center {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  justify-content: center;
  max-width: 680px;
}

.doc-name-container {
  display: flex;
  align-items: center;
  gap: 6px;
}

.doc-name-input {
  background: transparent;
  border: 1px solid transparent;
  color: #ffffff;
  font-weight: 700;
  font-size: 13.5px;
  padding: 2px 10px;
  border-radius: 4px;
  outline: none;
  text-align: center;
  min-width: 240px;
  max-width: 480px;
  font-family: inherit;
  transition: all 0.15s;
}

.doc-name-input:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.doc-name-input:focus {
  background: #ffffff;
  color: var(--cell-text);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.2);
}

.doc-saved-status {
  font-size: 11px;
  opacity: 0.9;
}

/* Search Box Pill */
.excel-search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 4px 10px;
  width: 240px;
  transition: all 0.15s;
}

.excel-search-box:hover,
.excel-search-box:focus-within {
  background: #ffffff;
}

.excel-search-box svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  opacity: 0.85;
}

.excel-search-box:focus-within svg {
  stroke: var(--cell-text);
}

.excel-search-box input {
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 12px;
  width: 100%;
  outline: none;
  font-family: inherit;
}

.excel-search-box:focus-within input {
  color: var(--cell-text);
}

.excel-search-box input::placeholder {
  color: rgba(255, 255, 255, 0.75);
}

.excel-search-box:focus-within input::placeholder {
  color: #94a3b8;
}

/* Right Window Controls */
.titlebar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sovereignty-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.2);
  padding: 3px 8px;
  border-radius: 4px;
}

.window-controls {
  display: flex;
  align-items: center;
}

.win-btn {
  background: transparent;
  border: none;
  color: #ffffff;
  width: 38px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s;
}

.win-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.win-btn.close:hover {
  background: #e81123;
}

.win-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

/* ==========================================================================
   2. Microsoft Excel Ribbon Bar
   ========================================================================== */
.excel-ribbon {
  background: var(--ribbon-bg);
  border-bottom: 1px solid var(--ribbon-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  z-index: 80;
  flex-shrink: 0;
}

.excel-ribbon.collapsed .ribbon-body {
  display: none;
}

/* Ribbon Tabs Header */
.ribbon-tabs {
  display: flex;
  align-items: stretch;
  background: var(--ribbon-header-bg);
  border-bottom: 1px solid var(--ribbon-border);
  padding: 0 6px;
  gap: 2px;
  height: 32px;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 0 14px;
  font-size: 12.5px;
  font-weight: 600;
  color: #323130;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.tab-btn:hover {
  background: #edebe9;
  color: var(--excel-green);
}

.tab-btn.active {
  background: #ffffff;
  color: var(--excel-green);
  font-weight: 700;
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2.5px;
  background: var(--excel-green);
}

.tab-btn.tab-file {
  background: var(--excel-green);
  color: #ffffff;
  font-weight: 700;
  border-radius: 3px 3px 0 0;
  margin-left: 6px;
}

.tab-btn.tab-file:hover {
  background: var(--excel-green-hover);
  color: #ffffff;
}

/* Ribbon Body & Panes */
.ribbon-body {
  background: #ffffff;
  height: 94px;
  padding: 4px 6px;
  overflow-x: auto;
  overflow-y: hidden;
}

.ribbon-tab-pane {
  display: none;
  height: 100%;
  align-items: stretch;
  gap: 6px;
}

.ribbon-tab-pane.active {
  display: flex;
}

/* Ribbon Command Group */
.ribbon-group {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-left: 1px solid var(--ribbon-divider);
  padding-left: 8px;
  margin-left: 2px;
  flex-shrink: 0;
}

.ribbon-group:last-child {
  border-left: none;
}

.group-tools {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.group-tools-col {
  display: flex;
  flex-direction: column;
  gap: 3px;
  justify-content: center;
}

.group-tools-row {
  display: flex;
  align-items: center;
  gap: 3px;
}

.group-label {
  font-size: 10.5px;
  color: #605e5c;
  text-align: center;
  margin-top: 2px;
  user-select: none;
}

/* Ribbon Buttons */
.ribbon-btn-large {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 4px 8px;
  min-width: 48px;
  height: 64px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  color: #323130;
  gap: 3px;
}

.ribbon-btn-large:hover {
  background: var(--ribbon-btn-hover);
  border-color: #e1dfdd;
}

.ribbon-btn-large:active {
  background: var(--ribbon-btn-active);
}

.ribbon-btn-large svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}

.ribbon-btn-large span {
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
}

.ribbon-btn-text {
  display: flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  padding: 2px 6px;
  height: 22px;
  cursor: pointer;
  font-size: 11.5px;
  color: #323130;
  transition: all 0.15s;
  font-family: inherit;
  white-space: nowrap;
}

.ribbon-btn-text:hover {
  background: var(--ribbon-btn-hover);
  border-color: #e1dfdd;
}

.ribbon-btn-text:active {
  background: var(--ribbon-btn-active);
}

.ribbon-btn-text svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

.ribbon-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  width: 26px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #323130;
  transition: all 0.15s;
  font-size: 12px;
  font-family: inherit;
}

.ribbon-btn:hover {
  background: var(--ribbon-btn-hover);
  border-color: #e1dfdd;
}

.ribbon-btn:active,
.ribbon-btn.active {
  background: #c7e0f4;
  border-color: #2b88d8;
  color: #004578;
}

.ribbon-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

.ribbon-select {
  border: 1px solid #d1d5db;
  border-radius: 3px;
  padding: 2px 4px;
  height: 24px;
  font-size: 11.5px;
  color: #323130;
  background: #ffffff;
  outline: none;
  font-family: inherit;
  cursor: pointer;
}

.ribbon-select:hover {
  border-color: #9ca3af;
}

.ribbon-select:focus {
  border-color: var(--excel-green);
}

/* Color Indicator Picker Button */
.color-tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  width: 28px;
  height: 24px;
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
}

.color-tool-btn:hover {
  background: var(--ribbon-btn-hover);
  border-color: #e1dfdd;
}

.color-tool-btn svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
}

.color-indicator-bar {
  width: 18px;
  height: 3px;
  border-radius: 1px;
  margin-top: 1px;
}

.color-tool-btn input[type="color"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

/* Borders Dropdown Menu */
.borders-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: var(--shadow-md);
  padding: 4px;
  z-index: 1000;
  width: 160px;
}

.borders-dropdown-menu.open {
  display: block;
}

.border-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  font-size: 12px;
  color: #334155;
  cursor: pointer;
  border-radius: 3px;
}

.border-menu-item:hover {
  background: #f1f5f9;
  color: var(--excel-green);
}

/* ==========================================================================
   3. Microsoft Excel Formula Bar
   ========================================================================== */
.excel-formula-bar {
  background: var(--formula-bar-bg);
  border-bottom: 1px solid var(--formula-bar-border);
  height: 28px;
  display: flex;
  align-items: center;
  padding: 0 4px;
  gap: 4px;
  z-index: 70;
  flex-shrink: 0;
}

.cell-name-box {
  width: 65px;
  height: 22px;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 2px;
  font-family: monospace, sans-serif;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  color: #1e293b;
  outline: none;
  transition: border-color 0.15s;
}

.cell-name-box:focus {
  border-color: var(--excel-green);
}

.formula-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  border-right: 1px solid #e2e8f0;
  border-left: 1px solid #e2e8f0;
  padding: 0 4px;
}

.formula-btn {
  background: transparent;
  border: none;
  width: 22px;
  height: 22px;
  border-radius: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #64748b;
  transition: all 0.15s;
}

.formula-btn:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.formula-btn.fx {
  font-family: Georgia, serif;
  font-style: italic;
  font-weight: bold;
  color: #047857;
}

.formula-input-container {
  flex: 1;
  height: 100%;
  display: flex;
  align-items: center;
}

.formula-input {
  width: 100%;
  height: 24px;
  border: none;
  outline: none;
  background: transparent;
  font-family: 'Segoe UI', Consolas, monospace;
  font-size: 13px;
  color: #1e293b;
  padding: 0 6px;
  direction: ltr;
  text-align: left;
}

/* ==========================================================================
   4. Spreadsheet Grid Canvas
   ========================================================================== */
.grid-viewport {
  flex: 1;
  position: relative;
  overflow: auto;
  background: #ffffff;
  outline: none;
}

.spreadsheet-table {
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
  background: #ffffff;
  min-width: 100%;
}

/* Corner Header Cell */
.grid-corner-cell {
  position: sticky;
  top: 0;
  right: 0;
  z-index: 50;
  width: 48px;
  min-width: 48px;
  height: 24px;
  background: var(--grid-header-bg);
  border-bottom: 1px solid var(--grid-border);
  border-left: 1px solid var(--grid-border);
  cursor: pointer;
  user-select: none;
}

.grid-corner-cell:hover {
  background: var(--grid-header-hover);
}

.grid-corner-cell::after {
  content: '';
  position: absolute;
  bottom: 3px;
  left: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 6px 6px;
  border-color: transparent transparent #94a3b8 transparent;
}

/* Column Header Cells (A, B, C...) */
.col-header-cell {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 24px;
  background: var(--grid-header-bg);
  border-bottom: 1px solid var(--grid-border);
  border-left: 1px solid var(--grid-border);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--grid-header-text);
  text-align: center;
  user-select: none;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}

.col-header-cell:hover {
  background: var(--grid-header-hover);
}

.col-header-cell.selected {
  background: var(--grid-header-active);
  color: var(--excel-green);
  border-bottom: 2px solid var(--excel-green);
}

.col-resizer {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -3px;
  width: 6px;
  cursor: col-resize;
  z-index: 45;
}

/* Row Header Cells (1, 2, 3...) */
.row-header-cell {
  position: sticky;
  right: 0;
  z-index: 30;
  width: 48px;
  min-width: 48px;
  background: var(--grid-header-bg);
  border-bottom: 1px solid var(--grid-border);
  border-left: 1px solid var(--grid-border);
  font-size: 11px;
  font-weight: 600;
  color: var(--grid-header-text);
  text-align: center;
  user-select: none;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}

.row-header-cell:hover {
  background: var(--grid-header-hover);
}

.row-header-cell.selected {
  background: var(--grid-header-active);
  color: var(--excel-green);
  border-left: 2px solid var(--excel-green);
}

.row-resizer {
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 6px;
  cursor: row-resize;
  z-index: 35;
}

/* Data Cells */
.grid-cell {
  height: 22px;
  border-bottom: 1px solid var(--grid-border);
  border-left: 1px solid var(--grid-border);
  padding: 2px 5px;
  font-size: 12px;
  color: var(--cell-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
  cursor: cell;
}

.grid-cell.selected-range {
  background-color: var(--selection-bg) !important;
}

/* Active Cell Outline & Fill Handle */
.grid-cell.active-cell {
  outline: 2px solid var(--selection-border);
  outline-offset: -2px;
  z-index: 10;
}

.autofill-handle {
  position: absolute;
  bottom: -4px;
  left: -4px;
  width: 7px;
  height: 7px;
  background: var(--selection-border);
  border: 1px solid #ffffff;
  cursor: crosshair;
  z-index: 25;
}

/* In-Cell Direct Editor Overlay */
.cell-in-place-editor {
  position: absolute;
  background: #ffffff;
  border: 2px solid var(--selection-border);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  font-family: inherit;
  font-size: 12px;
  padding: 2px 4px;
  outline: none;
  z-index: 100;
  overflow: hidden;
  white-space: pre-wrap;
}

/* ==========================================================================
   5. Multi-Sheet Tabs Bar
   ========================================================================== */
.excel-sheets-bar {
  background: #f3f2f1;
  border-top: 1px solid var(--ribbon-border);
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  flex-shrink: 0;
  z-index: 60;
}

.sheets-nav-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.sheets-nav-btn {
  background: transparent;
  border: none;
  width: 24px;
  height: 24px;
  border-radius: 3px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #605e5c;
  transition: all 0.15s;
}

.sheets-nav-btn:hover {
  background: #edebe9;
  color: #323130;
}

.sheets-list-container {
  display: flex;
  align-items: stretch;
  gap: 2px;
  overflow-x: auto;
  overflow-y: hidden;
  height: 100%;
}

.sheet-tab {
  background: #f8fafc;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: #475569;
  cursor: pointer;
  position: relative;
  height: 28px;
  margin-top: 4px;
  transition: all 0.15s;
}

.sheet-tab:hover {
  background: #ffffff;
  color: var(--excel-green);
}

.sheet-tab.active {
  background: #ffffff;
  color: var(--excel-green);
  font-weight: 700;
  border-color: #cbd5e1;
  box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.05);
}

.sheet-tab.active::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2.5px;
  background: var(--excel-green);
  border-radius: 4px 4px 0 0;
}

.add-sheet-btn {
  background: transparent;
  border: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--excel-green);
  font-size: 16px;
  font-weight: bold;
  margin: 0 4px;
  transition: all 0.15s;
}

.add-sheet-btn:hover {
  background: #e2e8f0;
}

/* ==========================================================================
   6. Status Bar
   ========================================================================== */
.excel-statusbar {
  background: var(--statusbar-bg);
  border-top: 1px solid #e5e7eb;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  font-size: 11px;
  color: var(--statusbar-text);
  flex-shrink: 0;
  z-index: 60;
}

.statusbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-pill {
  font-weight: 600;
  color: var(--excel-green);
}

.statusbar-metrics {
  display: flex;
  align-items: center;
  gap: 14px;
}

.metric-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-variant-numeric: tabular-nums;
}

.metric-label {
  color: #64748b;
}

.metric-value {
  font-weight: 700;
  color: #0f172a;
}

.statusbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.zoom-btn {
  background: transparent;
  border: none;
  width: 18px;
  height: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 13px;
  color: #64748b;
}

.zoom-btn:hover {
  color: #0f172a;
}

.zoom-slider {
  width: 70px;
  accent-color: var(--excel-green);
  cursor: pointer;
}

.zoom-value {
  width: 38px;
  text-align: center;
  font-weight: 600;
  font-size: 11px;
}

/* ==========================================================================
   7. Backstage View (ملف - File)
   ========================================================================== */
.excel-backstage {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #ffffff;
  z-index: 9999;
}

.excel-backstage.active {
  display: flex;
}

.backstage-sidebar {
  width: 240px;
  background: var(--excel-dark);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  flex-shrink: 0;
}

.backstage-back-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: none;
  color: #ffffff;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  margin-bottom: 20px;
  transition: background 0.15s;
}

.backstage-back-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.backstage-nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: none;
  color: #e2e8f0;
  padding: 12px 24px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: inherit;
  transition: all 0.15s;
}

.backstage-nav-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.backstage-nav-btn.active {
  background: #ffffff;
  color: var(--excel-green);
  font-weight: 700;
}

.backstage-content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
  background: #ffffff;
}

.backstage-pane {
  display: none;
  max-width: 900px;
}

.backstage-pane.active {
  display: block;
}

.templates-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.template-card {
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 16px;
  background: #ffffff;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.template-card:hover {
  border-color: var(--excel-green);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.template-card h4 {
  font-size: 14px;
  color: var(--excel-green);
  margin-bottom: 6px;
}

.template-card p {
  font-size: 12px;
  color: #64748b;
  line-height: 1.5;
}

.template-category-tag {
  align-self: flex-start;
  margin-top: 12px;
  background: var(--excel-green-light);
  color: var(--excel-green);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: bold;
}

/* Modals & Dialogs */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 5000;
  align-items: center;
  justify-content: center;
}

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

.excel-dialog {
  background: #ffffff;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 640px;
  overflow: hidden;
  animation: modalFadeIn 0.2s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.dialog-header {
  background: #f8fafc;
  padding: 12px 18px;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dialog-header h3 {
  font-size: 15px;
  color: #0f172a;
}

.dialog-close {
  background: transparent;
  border: none;
  font-size: 20px;
  color: #94a3b8;
  cursor: pointer;
}

.dialog-close:hover {
  color: #ef4444;
}

.dialog-body {
  padding: 20px;
  max-height: 70vh;
  overflow-y: auto;
}

.dialog-footer {
  padding: 12px 18px;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn-dialog {
  padding: 6px 16px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  font-family: inherit;
}

.btn-dialog.primary {
  background: var(--excel-green);
  color: #ffffff;
}

.btn-dialog.primary:hover {
  background: var(--excel-green-hover);
}

.btn-dialog.secondary {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #475569;
}

.btn-dialog.secondary:hover {
  background: #f1f5f9;
}

/* ==========================================================================
   Language Switcher & Multi-Lingual Layouts (AR / FR / EN)
   ========================================================================== */
.lang-switch-pill {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.22);
  border-radius: 14px;
  padding: 2px 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: #ffffff;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lang-btn.active {
  background: #ffffff;
  color: var(--excel-green);
  font-weight: 700;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* LTR Multi-Lingual Direction Overrides (French / English) */
html[dir="ltr"] .grid-corner-cell {
  left: 0;
  right: auto;
  border-right: 1px solid var(--grid-border);
  border-left: none;
}

html[dir="ltr"] .grid-corner-cell::after {
  right: 3px;
  left: auto;
  border-width: 0 6px 6px 0;
  border-color: transparent transparent #94a3b8 transparent;
}

html[dir="ltr"] .row-header-cell {
  left: 0;
  right: auto;
  border-right: 1px solid var(--grid-border);
  border-left: none;
}

html[dir="ltr"] .col-resizer {
  right: -3px;
  left: auto;
}

html[dir="ltr"] .autofill-handle {
  right: -4px;
  left: auto;
}

html[dir="ltr"] .backstage-sidebar {
  border-right: 1px solid rgba(0, 0, 0, 0.1);
  border-left: none;
}

html[dir="ltr"] .ribbon-group {
  border-right: 1px solid var(--ribbon-divider);
  border-left: none;
  padding-right: 8px;
  padding-left: 0;
  margin-right: 2px;
  margin-left: 0;
}

html[dir="ltr"] .tab-btn.tab-file {
  margin-right: 6px;
  margin-left: 0;
}