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

body {
    font-family: 'Consolas', 'Courier New', monospace;
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Top Bar */
.top-bar {
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.mode-switcher {
    display: flex;
    gap: 4px;
}

.mode-btn {
    padding: 6px 14px;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 13px;
    border-radius: 4px;
    font-family: 'Consolas', 'Courier New', monospace;
}

.mode-btn:hover {
    background-color: var(--menu-hover);
}

.mode-btn.active {
    background-color: var(--border-color);
    border-color: var(--text-color);
}

.app-name {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 18px;
    font-weight: bold;
    color: var(--text-color);
    text-decoration: none;
    transition: opacity 0.2s;
}

.app-name:hover {
    opacity: 0.7;
}

/* Theme Variables */
.dark-theme {
    --bg-color: #1E1E1E;
    --text-color: #FFFFFF;
    --toolbar-bg: #2A2A2A;
    --menu-bg: #2A2A2A;
    --menu-hover: #3A3A3A;
    --border-color: #404040;
}

.light-theme {
    --bg-color: #FFF8F0;
    --text-color: #000000;
    --toolbar-bg: #F5F0E8;
    --menu-bg: #F5F0E8;
    --menu-hover: #EBE5DD;
    --border-color: #D0C8C0;
}

body.dark-theme {
    background-color: var(--bg-color);
    color: var(--text-color);
}

body.light-theme {
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* Menu Bar */
.menu-bar {
    display: flex;
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    z-index: 100;
}

.menu-item {
    position: relative;
    padding: 8px 16px;
    cursor: pointer;
    user-select: none;
}

.menu-item:hover {
    background-color: var(--menu-hover);
}

.menu-item > span {
    font-size: 14px;
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    min-width: 200px;
    box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.menu-item:hover .menu-dropdown {
    display: block;
}

.menu-option {
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.menu-option:hover {
    background-color: var(--menu-hover);
}

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

.shortcut {
    color: #888;
    font-size: 12px;
    margin-left: 20px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 6px 10px;
    gap: 8px;
    flex-wrap: wrap;
}

.toolbar-btn {
    padding: 6px 12px;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 14px;
    border-radius: 3px;
    font-family: 'Arial', sans-serif;
}

.toolbar-btn:hover {
    background-color: var(--menu-hover);
}

.toolbar-btn.small {
    padding: 4px 8px;
    min-width: 30px;
}

#boldBtn {
    font-weight: bold;
}

.theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-icon {
    font-size: 16px;
    line-height: 1;
    font-family: 'Consolas', 'Courier New', monospace;
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 4px;
}

.toolbar-label {
    font-size: 14px;
    color: var(--text-color);
    margin-right: 4px;
}

.font-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.font-size-select {
    padding: 4px 8px;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 14px;
    border-radius: 3px;
    font-family: 'Consolas', 'Courier New', monospace;
    cursor: pointer;
    min-width: 80px;
}

.font-size-select:focus {
    outline: none;
    border-color: var(--text-color);
}

.palette-container {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.palette {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.palette-btn {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    cursor: pointer;
    transition: transform 0.1s;
}

.palette-btn:hover {
    transform: scale(1.1);
    border-color: var(--text-color);
}

/* Main Content Area */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar with Tabs */
.sidebar {
    width: 200px;
    background-color: var(--toolbar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: row;
    transition: width 0.3s ease;
    position: relative;
}

.sidebar.collapsed {
    width: 30px;
}

.sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-content {
    display: none;
}

.collapse-btn {
    width: 30px;
    background-color: var(--menu-bg);
    border: none;
    border-right: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 14px;
    font-family: 'Consolas', 'Courier New', monospace;
    transition: background-color 0.2s;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    padding: 8px 4px;
}

.collapse-btn:hover {
    background-color: var(--menu-hover);
}

.sidebar.collapsed .collapse-btn {
    writing-mode: horizontal-tb;
    text-orientation: unset;
}

.tabs-container {
    flex: 1;
    overflow-y: auto;
}

.tab-item {
    padding: 10px 12px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    user-select: none;
    position: relative;
    transition: background-color 0.2s;
}

.tab-item:hover {
    background-color: var(--menu-hover);
}

.tab-item.active {
    background-color: var(--menu-hover);
    border-left: 3px solid var(--text-color);
}

.tab-name {
    font-size: 13px;
    color: var(--text-color);
    word-break: break-word;
}

.tab-name.editing {
    display: none;
}

.tab-input {
    width: 100%;
    padding: 2px 4px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 13px;
    font-family: 'Consolas', 'Courier New', monospace;
    border-radius: 2px;
}

.add-tab-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--toolbar-bg);
    border: none;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 24px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-weight: bold;
}

.add-tab-btn:hover {
    background-color: var(--menu-hover);
}

/* Text Editor */
.editor-container {
    flex: 1;
    overflow: hidden;
    padding: 10px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.editor-overlay {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    pointer-events: none;
    z-index: 2;
}

.text-editor {
    width: 100%;
    height: 100%;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 11px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: none;
    outline: none;
    resize: none;
    overflow-y: auto;
    padding: 10px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.text-editor:focus {
    outline: none;
}

/* Current line highlighting – overlay sits on top so line bar is visible */
.text-editor {
    position: relative;
    z-index: 1;
}

.current-line {
    position: absolute;
    left: 0;
    right: 0;
    pointer-events: none;
    transition: background-color 0.1s;
    /* A little darker than the editor background so the current line is clear */
    background-color: rgba(0, 0, 0, 0.2);
}

.light-theme .current-line {
    background-color: rgba(0, 0, 0, 0.08);
}

/* Scrollbar Styling */
.text-editor::-webkit-scrollbar {
    width: 12px;
}

.text-editor::-webkit-scrollbar-track {
    background: var(--toolbar-bg);
}

.text-editor::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 6px;
}

.text-editor::-webkit-scrollbar-thumb:hover {
    background: #666;
}

/* Selection Styling */
.text-editor::selection {
    background-color: rgba(100, 150, 255, 0.3);
}

/* Spreadsheet mode */
.spreadsheet-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.spreadsheet-toolbar {
    display: flex;
    flex-direction: column;
    flex: 0 0 auto;
    min-height: 0;
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
}

/* Top: Cell content area – full width, maximised for text */
.sheet-toolbar-cell-area {
    flex: 0 0 auto;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    padding: 6px 10px 4px;
    min-width: 0;
}

.sheet-toolbar-cell-area .cell-editor-label {
    font-size: 11px;
    color: var(--text-color);
    opacity: 0.85;
    margin-bottom: 4px;
    flex-shrink: 0;
}

.cell-editor-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 56px;
    max-height: 220px;
    min-width: 0;
}

.cell-editor {
    flex: 1;
    min-height: 48px;
    width: 100%;
    padding: 8px 10px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.4;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 4px;
    resize: vertical;
    box-sizing: border-box;
}

.cell-editor:focus {
    outline: none;
    border-color: var(--text-color);
}

.cell-editor-resize-handle {
    flex-shrink: 0;
    height: 5px;
    cursor: ns-resize;
    background: linear-gradient(to bottom, transparent 0%, var(--border-color) 50%, transparent 100%);
    border-radius: 2px;
    margin-top: 4px;
}

.cell-editor-resize-handle:hover {
    background: var(--border-color);
}

/* Bottom: compact controls row */
.sheet-toolbar-controls {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 4px 10px 6px;
    border-top: 1px solid var(--border-color);
}

.sheet-control-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.sheet-label {
    font-size: 11px;
    color: var(--text-color);
    opacity: 0.9;
    margin-right: 2px;
}

.formula-bar {
    width: 140px;
    max-width: 180px;
    padding: 4px 8px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 3px;
}

.formula-bar:focus {
    outline: none;
    border-color: var(--text-color);
}

.formula-cell-name {
    min-width: 28px;
    font-size: 11px;
    color: #888;
}

.sheet-btn {
    padding: 4px 8px;
    min-width: 28px;
    font-size: 12px;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    border-radius: 3px;
    font-family: 'Consolas', 'Courier New', monospace;
}

.sheet-btn:hover {
    background-color: var(--menu-hover);
}

.sheet-btn.theme-btn {
    padding: 4px 6px;
}

.sheet-palette {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
    max-width: 180px;
}

.sheet-palette .palette-btn {
    width: 18px;
    height: 18px;
}

.spreadsheet-scroll {
    flex: 1;
    overflow: auto;
    padding: 10px;
}

.sheet-table {
    border-collapse: collapse;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 13px;
    table-layout: fixed;
}

.sheet-table th,
.sheet-table td {
    border: 1px solid var(--border-color);
    padding: 0;
    margin: 0;
    height: 26px;
    vertical-align: middle;
}

.sheet-table td:not(.row-header) {
    min-width: 40px;
}

.sheet-table th {
    background-color: var(--menu-bg);
    color: var(--text-color);
    font-weight: 600;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 2;
}

.sheet-table th.sheet-col-header {
    position: relative;
    min-width: 40px;
}

.sheet-col-resize {
    position: absolute;
    top: 0;
    right: 0;
    width: 12px;
    height: 100%;
    cursor: col-resize;
    z-index: 10;
    pointer-events: auto;
}

.sheet-col-resize:hover {
    background-color: rgba(100, 150, 255, 0.25);
}

.sheet-col-resize::after {
    content: '';
    position: absolute;
    top: 30%;
    right: 4px;
    bottom: 30%;
    width: 1px;
    background: var(--border-color);
}

.sheet-table th.corner {
    left: 0;
    z-index: 3;
}

.sheet-table td.row-header {
    background-color: var(--menu-bg);
    color: var(--text-color);
    font-weight: 600;
    text-align: center;
    min-width: 36px;
    width: 36px;
    position: sticky;
    left: 0;
    z-index: 1;
}

.sheet-cell-input {
    width: 100%;
    height: 100%;
    min-height: 24px;
    padding: 2px 6px;
    border: none;
    background: transparent;
    color: var(--text-color);
    font-family: inherit;
    font-size: inherit;
    box-sizing: border-box;
}

.sheet-table td.selected {
    outline: 2px solid rgba(100, 150, 255, 0.9);
    outline-offset: -2px;
    z-index: 1;
    position: relative;
}

.sheet-table td.sheet-cell-in-range {
    background-color: rgba(100, 150, 255, 0.22);
}

.sheet-table td.sheet-cell-in-range.selected {
    background-color: rgba(100, 150, 255, 0.35);
}

.sheet-table td .sheet-cell-input {
    cursor: cell;
}

.sheet-table td .sheet-cell-input:focus {
    outline: none;
}

.sheet-cell-input:focus {
    outline: none;
}

.sheet-cell-input.align-left { text-align: left; }
.sheet-cell-input.align-center { text-align: center; }
.sheet-cell-input.align-right { text-align: right; }

/* Filter row */
.sheet-filter-row th {
    padding: 2px 4px;
    min-width: 80px;
    max-width: 200px;
    height: 24px;
    vertical-align: middle;
}

.sheet-filter-cell {
    position: relative;
}

.sheet-filter-toggle {
    width: 100%;
    padding: 2px 6px;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 12px;
    font-family: 'Consolas', 'Courier New', monospace;
    border-radius: 2px;
}

.sheet-filter-toggle:hover {
    background-color: var(--menu-hover);
}

.sheet-filter-toggle.active {
    background-color: rgba(100, 150, 255, 0.25);
    border-color: rgba(100, 150, 255, 0.6);
}

.sheet-filter-dropdown {
    position: fixed;
    z-index: 3000;
    background-color: var(--menu-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: 2px 4px 12px rgba(0, 0, 0, 0.3);
    padding: 8px;
    max-height: 280px;
    display: flex;
    flex-direction: column;
}

.sheet-filter-list {
    overflow-y: auto;
    margin-bottom: 8px;
    max-height: 200px;
}

.sheet-filter-item {
    display: block;
    padding: 4px 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-color);
}

.sheet-filter-item:hover {
    background-color: var(--menu-hover);
}

.sheet-filter-cb {
    margin-right: 8px;
}

.sheet-filter-btn {
    padding: 4px 10px;
    margin-right: 4px;
    margin-top: 2px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 12px;
    border-radius: 3px;
}

.sheet-filter-btn:hover {
    background-color: var(--menu-hover);
}

.sheet-filter-apply {
    background-color: rgba(100, 150, 255, 0.3);
    border-color: rgba(100, 150, 255, 0.6);
}

.spreadsheet-toolbar .toolbar-btn.active,
.sheet-btn.active {
    background-color: rgba(100, 150, 255, 0.25);
    border-color: rgba(100, 150, 255, 0.6);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal {
    background-color: var(--toolbar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    min-width: 320px;
    max-width: 90vw;
}

.modal-title {
    margin-bottom: 8px;
    font-size: 16px;
    color: var(--text-color);
}

.modal-hint {
    font-size: 12px;
    color: #888;
    margin-bottom: 16px;
}

.modal-row {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-row label {
    min-width: 120px;
    font-size: 13px;
    color: var(--text-color);
}

.modal-input,
.modal-select {
    flex: 1;
    padding: 6px 10px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 13px;
    border-radius: 3px;
}

.modal-actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}