/* CSS Variables for Light and Dark Mode */
:root {
    /* Light theme variables */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --accent-color: #3b82f6;
    --accent-light: #e0f2fe;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --dropdown-bg: #ffffff;
    --toolbar-hover: #e2e8f0;
    --menu-hover: #eff6ff;
    --border-color: rgba(0,0,0,0.1);
}

.dark-mode {
    /* Dark theme variables */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --accent-light: #1e40af;
    --shadow: 0 4px 12px rgba(0,0,0,0.4);
    --dropdown-bg: #1e293b;
    --toolbar-hover: #334155;
    --menu-hover: #1e40af;
    --border-color: rgba(255,255,255,0.1);
}

/* Spreadsheet Container */
.spreadsheet-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary, #f8fafc);
    color: var(--text-primary, #1e293b);
}

/* Spreadsheet Wrapper */
.spreadsheet-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.spreadsheet-scroll-container {
    width: 100%;
    height: 100%;
    overflow: auto;
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
}

/* Spreadsheet Table */
.spreadsheet-table {
    border-collapse: collapse;
    width: auto;
    min-width: 100%;
    background-color: white;
    font-size: 0.85rem;
    outline: none;
}

/* Prevent browser focus ring around the whole table */
#spreadsheetTable:focus,
#spreadsheetTable:focus-visible {
    outline: none;
}

/* Header Cells (Row numbers and Column letters) */
.spreadsheet-table th {
    background-color: var(--bg-secondary, #f1f5f9);
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
    padding: 0;
    margin: 0;
    font-weight: 600;
    text-align: center;
    user-select: none;
    position: sticky;
    z-index: 10;
}

.spreadsheet-table th.row-header {
    width: 50px;
    min-width: 50px;
    max-width: 50px;
    left: 0;
    background-color: var(--bg-secondary, #f1f5f9);
    z-index: 20;
}

.spreadsheet-table th.col-header {
    width: 80px;
    min-width: 80px;
    max-width: 80px;
    height: 25px;
    top: 0;
    background-color: var(--bg-secondary, #f1f5f9);
    padding: 2px 4px;
    text-align: center;
    cursor: pointer;
}

/* Column Header Content */
.column-display {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary, #1e293b);
    user-select: none;
}

.column-name-input {
    border: 1px solid var(--accent-color, #3b82f6);
    background: white;
    outline: none;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary, #1e293b);
    width: 70px;
    padding: 1px 3px;
    margin: 0;
    text-align: center;
    border-radius: 2px;
}

.spreadsheet-table th.corner-cell {
    width: 50px;
    min-width: 50px;
    max-width: 50px;
    height: 25px;
    top: 0;
    left: 0;
    z-index: 30;
    background-color: var(--bg-secondary, #f1f5f9);
}

/* Data Cells */
.spreadsheet-table td {
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
    padding: 0;
    margin: 0;
    width: 80px;
    min-width: 80px;
    max-width: 80px;
    height: 22px;
    position: relative;
    background-color: white;
    cursor: cell;
}

.spreadsheet-table td.selected {
    background-color: var(--accent-color, #3b82f6) !important;
    color: white;
}

.spreadsheet-table td.selected-range {
    background-color: rgba(59, 130, 246, 0.2) !important;
}

.spreadsheet-table td.editing {
    background-color: white !important;
    color: var(--text-primary, #1e293b) !important;
}

/* Cell Input */
.cell-input {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 2px 4px;
    font-size: 0.85rem;
    font-family: inherit;
    background: transparent;
    resize: none;
    overflow: hidden;
}

.cell-input:focus {
    background-color: white;
    box-shadow: 0 0 0 2px var(--accent-color, #3b82f6);
}

/* Selection Indicators */
.spreadsheet-table th.selected-header {
    background-color: var(--accent-color, #3b82f6) !important;
    color: white;
}

/* Hover Effects */
.spreadsheet-table th:hover {
    background-color: var(--toolbar-hover, #e2e8f0);
}

.spreadsheet-table td:hover {
    background-color: var(--toolbar-hover, #e2e8f0);
}

.spreadsheet-table td.selected:hover,
.spreadsheet-table td.editing:hover {
    background-color: var(--accent-color, #3b82f6);
}

/* Dark Mode Support */
.dark-mode .spreadsheet-container {
    background-color: var(--bg-primary, #0f172a);
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .spreadsheet-table {
    background-color: var(--bg-primary, #0f172a);
}

.dark-mode .spreadsheet-table td {
    background-color: var(--bg-primary, #0f172a);
    border-color: var(--border-color, rgba(255,255,255,0.1));
}

.dark-mode .spreadsheet-table th {
    background-color: var(--bg-secondary, #1e293b);
    border-color: var(--border-color, rgba(255,255,255,0.1));
}

.dark-mode .cell-input {
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .cell-input:focus {
    background-color: var(--bg-primary, #0f172a);
}

.dark-mode .column-display {
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .column-name-input {
    background-color: var(--bg-primary, #0f172a);
    color: var(--text-primary, #f1f5f9);
    border-color: var(--accent-color, #3b82f6);
}

/* Scrollbar Styling */
.spreadsheet-scroll-container::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.spreadsheet-scroll-container::-webkit-scrollbar-track {
    background: var(--bg-secondary, #f1f5f9);
    border-radius: 6px;
}

.spreadsheet-scroll-container::-webkit-scrollbar-thumb {
    background: var(--border-color, rgba(0,0,0,0.3));
    border-radius: 6px;
    border: 1px solid var(--bg-primary, #f8fafc);
}

.spreadsheet-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color, #3b82f6);
}

.spreadsheet-scroll-container::-webkit-scrollbar-corner {
    background: var(--bg-secondary, #f1f5f9);
}

/* Dark Mode Scrollbar */
.dark-mode .spreadsheet-scroll-container::-webkit-scrollbar-track {
    background: var(--bg-secondary, #1e293b);
}

.dark-mode .spreadsheet-scroll-container::-webkit-scrollbar-thumb {
    background: var(--border-color, rgba(255,255,255,0.2));
    border: 1px solid var(--bg-primary, #0f172a);
}

.dark-mode .spreadsheet-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color, #3b82f6);
}

.dark-mode .spreadsheet-scroll-container::-webkit-scrollbar-corner {
    background: var(--bg-secondary, #1e293b);
}

/* Context Menu */
.context-menu {
    position: fixed;
    background-color: var(--dropdown-bg, #ffffff);
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
    border-radius: 6px;
    box-shadow: var(--shadow, 0 4px 12px rgba(0,0,0,0.15));
    z-index: 1000;
    min-width: 180px;
    padding: 4px 0;
    font-size: 0.85rem;
}

.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary, #1e293b);
    transition: background-color 0.2s;
}

.context-menu-item:hover {
    background-color: var(--menu-hover, #eff6ff);
}

.context-menu-item i {
    width: 14px;
    font-size: 0.8rem;
    color: var(--accent-color, #3b82f6);
}

.context-menu-divider {
    height: 1px;
    background-color: var(--border-color, rgba(0,0,0,0.1));
    margin: 4px 0;
}

/* Dark Mode Context Menu */
.dark-mode .context-menu {
    background-color: var(--dropdown-bg, #1e293b);
    border-color: var(--border-color, rgba(255,255,255,0.1));
}

.dark-mode .context-menu-item {
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .context-menu-item:hover {
    background-color: var(--menu-hover, #1e40af);
}

.dark-mode .context-menu-divider {
    background-color: var(--border-color, rgba(255,255,255,0.1));
}

/* Modal Dialog for Paste Expansion */
.paste-expansion-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.modal-content {
    position: relative;
    background-color: var(--bg-primary, #f8fafc);
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
    border-radius: 8px;
    box-shadow: var(--shadow, 0 8px 24px rgba(0,0,0,0.15));
    padding: 24px;
    max-width: 500px;
    width: 90%;
    color: var(--text-primary, #1e293b);
}

.modal-content h3 {
    margin: 0 0 16px 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary, #1e293b);
}

.modal-content p {
    margin: 0 0 12px 0;
    line-height: 1.5;
    color: var(--text-secondary, #475569);
}

.modal-content ul {
    margin: 0 0 16px 0;
    padding-left: 20px;
}

.modal-content li {
    margin-bottom: 8px;
    line-height: 1.4;
    color: var(--text-secondary, #475569);
}

.modal-content li strong {
    color: var(--text-primary, #1e293b);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}

.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent-color, #3b82f6);
    color: white;
}

.btn-primary:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-secondary, #f1f5f9);
    color: var(--text-primary, #1e293b);
    border: 1px solid var(--border-color, rgba(0,0,0,0.1));
}

.btn-secondary:hover {
    background-color: var(--toolbar-hover, #e2e8f0);
    transform: translateY(-1px);
}

.btn-cancel {
    background-color: #ef4444;
    color: white;
}

.btn-cancel:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
}

/* Dark Mode Modal */
.dark-mode .modal-content {
    background-color: var(--bg-primary, #0f172a);
    border-color: var(--border-color, rgba(255,255,255,0.1));
}

.dark-mode .modal-content h3 {
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .modal-content p,
.dark-mode .modal-content li {
    color: var(--text-secondary, #cbd5e1);
}

.dark-mode .modal-content li strong {
    color: var(--text-primary, #f1f5f9);
}

.dark-mode .btn-secondary {
    background-color: var(--bg-secondary, #1e293b);
    color: var(--text-primary, #f1f5f9);
    border-color: var(--border-color, rgba(255,255,255,0.1));
}

.dark-mode .btn-secondary:hover {
    background-color: var(--toolbar-hover, #334155);
}

/* Responsive */
@media (max-width: 768px) {
    .spreadsheet-table th.col-header,
    .spreadsheet-table td {
        width: 70px;
        min-width: 70px;
        max-width: 70px;
    }
    
    .column-display {
        font-size: 0.7rem;
    }
    
    .column-name-input {
        font-size: 0.7rem;
        width: 60px;
    }
    
    .spreadsheet-table th.row-header,
    .spreadsheet-table th.corner-cell {
        width: 40px;
        min-width: 40px;
        max-width: 40px;
    }
    
    .context-menu {
        min-width: 160px;
        font-size: 0.8rem;
    }
    
    .context-menu-item {
        padding: 10px 14px;
    }
}