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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.upload-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
    align-items: start;
}

.upload-box {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    width: 100%;
}

.upload-info-box {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
}

.upload-info-box h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.upload-info-box h4 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.info-warning {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
}

.info-warning strong {
    color: #92400e;
}

.supported-columns {
    margin-top: 1rem;
}

.supported-columns ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.supported-columns li {
    padding: 0.5rem;
    background: var(--bg-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

.supported-columns code {
    background: #e5e7eb;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.upload-box h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-box p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-block;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
    margin-top: 1rem;
}

.btn-success:hover:not(:disabled) {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.file-name {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.status-message {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
    word-wrap: break-word;
}

.status-message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.status-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 2px solid #ef4444;
    font-weight: 500;
}

.dashboard {
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.dashboard-header h2 {
    color: var(--text-primary);
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background-color: transparent;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.dashboard-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.dashboard-left,
.dashboard-right {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.stat-card h4 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .sub-value {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.chart-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chart-controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.chart-controls h3 {
    grid-column: 1 / -1;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.control-group {
    display: flex;
    flex-direction: column;
}

.control-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-control {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: white;
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.chart-container {
    flex: 1;
    min-height: 400px;
    background: white;
    border-radius: 8px;
    padding: 1rem;
}

.groupby-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.groupby-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.groupby-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group.full-width {
    width: 100%;
}

.control-group select[multiple] {
    min-height: 120px;
    padding: 0.5rem;
}

.control-group small {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.aggregations-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.aggregations-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.aggregations-header label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.aggregation-item {
    display: grid;
    grid-template-columns: 2fr 1.5fr 2fr auto;
    gap: 1rem;
    align-items: end;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.aggregation-item .form-control {
    margin: 0;
}

.aggregation-item .btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
}

.aggregation-item .btn-danger:hover {
    background-color: #dc2626;
}

.groupby-results {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.groupby-results h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.groupby-results .results-header {
    margin-bottom: 0.5rem;
}

.groupby-results .table-wrapper {
    flex: 1;
    overflow: auto;
    max-height: 400px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.results-header h4 {
    color: var(--text-primary);
    margin: 0;
}

.data-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.data-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.table-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.table-controls .form-control {
    flex: 1;
}

.table-wrapper {
    overflow: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    max-height: 500px;
    background: white;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-size: 0.875rem;
}

.data-table thead {
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.data-table th {
    padding: 0.5rem 0.75rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    user-select: none;
    position: relative;
    white-space: nowrap;
}

.data-table th:hover {
    background-color: #e2e8f0;
}

.data-table th.sortable::after {
    content: ' ↕';
    opacity: 0.5;
    font-size: 0.7rem;
}

.data-table th.sort-asc::after {
    content: ' ↑';
    opacity: 1;
}

.data-table th.sort-desc::after {
    content: ' ↓';
    opacity: 1;
}

.data-table td {
    padding: 0.4rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background-color: var(--bg-color);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.initiative-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.initiative-header {
    margin-bottom: 1.5rem;
}

.initiative-header h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.sticky-filter-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.filter-controls {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.date-range-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 280px;
}

.date-range-controls .btn-sm {
    margin-top: 0.25rem;
    align-self: flex-start;
}

.date-range-controls label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.date-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.date-input {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.9rem;
}

.date-separator {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.year-filter-control,
.period-filter-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 150px;
}

.info-control {
    display: flex;
    align-items: flex-end;
}

.info-control {
    display: flex;
    align-items: flex-end;
}

.year-filter-control label,
.period-filter-control label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.help-icon {
    display: inline-block;
    cursor: pointer;
    margin-left: 0.5rem;
    font-size: 0.9rem;
    color: var(--primary-color);
    transition: transform 0.2s;
}

.help-icon:hover {
    transform: scale(1.2);
}

.year-filter-control .form-control,
.period-filter-control .form-control {
    padding: 0.5rem;
    font-size: 0.9rem;
}

/* Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.holiday-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.holiday-list li {
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--bg-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.holiday-list li strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.holiday-dates {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.holiday-note {
    margin-top: 1rem;
    padding: 0.75rem;
    background: #fef3c7;
    border-radius: 6px;
    color: #92400e;
    font-size: 0.875rem;
}

.day-week-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.day-week-section h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.section-description-small {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.heatmap-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.heatmap-controls label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.heatmap-controls .form-control {
    padding: 0.5rem;
    font-size: 0.9rem;
    min-width: 180px;
}

.heatmap-container {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    min-height: 400px;
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.loading-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.insights-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.insights-section h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: 1rem;
}

.insight-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: white;
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.insight-item:last-child {
    margin-bottom: 0;
}

.insight-item.holiday-insight {
    border-left: 3px solid #f59e0b;
    background: #fffbeb;
}

.insight-item.no-discount-insight {
    border-left: 3px solid #10b981;
    background: #ecfdf5;
}

.holiday-badge {
    display: inline-block;
    background: #f59e0b;
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: 0.5rem;
}

/* Responsive design */
@media (max-width: 1200px) {
    .dashboard-main {
        grid-template-columns: 1fr;
    }

    .initiative-header {
        flex-direction: column;
        align-items: stretch;
    }

    .sticky-filter-bar {
        position: relative;
        top: 0;
    }

    .filter-controls {
        flex-direction: column;
        width: 100%;
    }

    .date-range-controls {
        min-width: auto;
        width: 100%;
    }

    .date-inputs {
        flex-direction: column;
        align-items: stretch;
    }

    .date-separator {
        display: none;
    }

    .year-filter-control,
    .period-filter-control,
    .info-control {
        min-width: auto;
        width: 100%;
    }

    .modal-content {
        width: 95%;
        max-height: 90vh;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .upload-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .upload-box {
        padding: 2rem 1.5rem;
    }
    
    .upload-info-box {
        padding: 1.5rem;
    }
    
    .supported-columns ul {
        grid-template-columns: 1fr;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .dashboard-main {
        grid-template-columns: 1fr;
    }

    .chart-controls {
        grid-template-columns: 1fr;
    }

    .table-controls {
        flex-direction: column;
    }
}

/* Before / After Comparisons Tab */
.comparison-section {
    padding: 1.5rem 0;
}

.comparison-header {
    margin-bottom: 2rem;
}

.comparison-controls {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.control-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.control-row:last-child {
    margin-bottom: 0;
}

.comparison-controls .control-group {
    flex: 1;
    min-width: 200px;
}

.comparison-controls .date-range-controls {
    flex: 2;
    min-width: 300px;
}

.comparison-results {
    margin-top: 2rem;
}

.comparison-summary {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.comparison-summary h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.summary-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.summary-stat {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.comparison-table-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.comparison-table-container h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.comparison-table-container .data-table {
    width: 100%;
    margin-top: 1rem;
}

.comparison-table-container .data-table th {
    background: var(--bg-color);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.comparison-table-container .data-table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table-container .data-table tr:hover {
    background: var(--bg-color);
}

/* Transition List */
.transition-list-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.transition-list-section h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.transition-filter-controls {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.transition-filter-controls .date-range-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.transition-filter-controls .date-range-controls label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.transition-list {
    max-height: 400px;
    overflow-y: auto;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
}

.transition-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--bg-color);
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.transition-item:hover {
    background: #e2e8f0;
}

.transition-item:last-child {
    margin-bottom: 0;
}

.transition-item input[type="checkbox"] {
    margin-right: 0.75rem;
    cursor: pointer;
}

.transition-label {
    cursor: pointer;
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.no-transitions {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Conversion Efficiency Tab */
.efficiency-section {
    padding: 1.5rem 0;
}

.efficiency-header {
    margin-bottom: 2rem;
}

.efficiency-results {
    margin-top: 2rem;
}

.efficiency-table-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.efficiency-table-container h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.insight-item.warning-insight {
    border-left: 3px solid #f59e0b;
    background: #fffbeb;
}

.insight-item.success-insight {
    border-left: 3px solid var(--success-color);
    background: #ecfdf5;
}

.insight-item.info-insight {
    border-left: 3px solid var(--primary-color);
    background: #eff6ff;
}

/* What If Simulator Tab */
.simulator-section {
    padding: 1.5rem 0;
    min-height: 200px;
    position: relative;
}

.simulator-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    margin-bottom: 2rem;
}

.simulator-header > div:first-child {
    flex: 1;
}

.simulator-info-box {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
    max-width: 400px;
    flex-shrink: 0;
}

.simulator-info-box h4 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.simulator-info-box p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.simulator-info-box ul {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-left: 1.25rem;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.simulator-info-box li {
    margin-bottom: 0.5rem;
}

.simulator-controls {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    width: 100%;
    min-height: 200px;
}

.simulator-results {
    margin-top: 2rem;
}

.simulation-predictions {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.simulation-predictions h4 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.prediction-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.prediction-card {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color);
    text-align: center;
}

.prediction-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prediction-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.prediction-detail {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
}

.sample-info {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 1200px) {
    .simulator-header {
        flex-direction: column;
    }
    
    .simulator-info-box {
        max-width: 100%;
    }
}

/* Calendar Planner Tab */
.calendar-section {
    padding: 1.5rem 0;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.calendar-settings-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.calendar-settings-panel h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.settings-grid .control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.settings-grid .control-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.settings-grid .control-group small {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
}

.settings-grid .control-group input[type="checkbox"] {
    margin-right: 0.5rem;
}

.calendar-controls-top {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.calendar-controls-top select {
    min-width: 120px;
}

.recommendations-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.recommendations-panel h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.recommendation-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.recommendation-item:last-child {
    border-bottom: none;
}

.rec-day {
    font-weight: 600;
    min-width: 100px;
    color: var(--text-primary);
}

.rec-initiative {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-weight: 500;
    min-width: 80px;
    text-align: center;
}

.rec-details {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-left: auto;
}

.calendar-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.75rem;
    overflow-x: auto;
}

.calendar-header-cell {
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    padding: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.calendar-day {
    min-height: 200px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    position: relative;
    background: var(--bg-color);
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
}

.calendar-day.empty {
    border: none;
    background: transparent;
}

.calendar-day.past {
    background: #f8f9fa;
    border-color: #dee2e6;
}

.calendar-day.today {
    background: #fff3cd;
    border-color: var(--primary-color);
    border-width: 3px;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.calendar-day.future {
    background: white;
    cursor: pointer;
    border-color: #cbd5e1;
}

.calendar-day.future:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.comparison-data {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
}

.comparison-row {
    display: flex;
    justify-content: space-between;
    padding: 0.25rem 0;
    border-bottom: 1px solid #f1f5f9;
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-label {
    color: var(--text-secondary);
}

.comparison-value {
    font-weight: 600;
}

.comparison-value.actual {
    color: var(--success-color);
}

.comparison-value.predicted {
    color: var(--primary-color);
}

.comparison-value.prev-year {
    color: var(--secondary-color);
}

.comparison-diff {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.comparison-diff.positive {
    color: var(--success-color);
}

.comparison-diff.negative {
    color: var(--danger-color);
}

.calendar-day.drag-over {
    border-color: var(--primary-color);
    background: #e0f2fe;
    box-shadow: 0 0 0 3px var(--primary-color);
    transform: scale(1.02);
}

.day-date {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.day-of-week {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.initiative-container {
    margin-bottom: 0.75rem;
}

.initiative-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    text-align: center;
    width: 100%;
}

.initiative-placeholder {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-style: italic;
    padding: 0.5rem;
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: 4px;
}

.day-stats {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.8rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 0;
    border-bottom: 1px solid #f1f5f9;
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-item.projected {
    color: var(--primary-color);
    font-weight: 500;
}

.stat-item.no-data {
    color: var(--text-secondary);
    font-style: italic;
    justify-content: center;
    padding: 0.5rem 0;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.stat-value {
    font-weight: 600;
    color: var(--text-primary);
}

.stat-item.projected .stat-value {
    color: var(--primary-color);
}

.sample-size {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: center;
}

.performance-indicator {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.performance-indicator.high {
    background: var(--success-color);
}

.performance-indicator.medium {
    background: #f59e0b;
}

.performance-indicator.low {
    background: var(--danger-color);
}

.initiative-palette {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.initiative-palette h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.palette-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.palette-item {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: grab;
    font-weight: 500;
    transition: all 0.2s;
    user-select: none;
}

.palette-item:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.palette-item:active {
    cursor: grabbing;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .calendar-header {
        flex-direction: column;
    }
    
    .calendar-controls-top {
        width: 100%;
        justify-content: space-between;
    }
    
    .calendar-grid {
        gap: 0.25rem;
    }
    
    .calendar-day {
        min-height: 80px;
        padding: 0.25rem;
    }
}

/* Holiday Comparison Tab */
.holiday-section {
    padding: 1.5rem 0;
}

.holiday-header {
    margin-bottom: 2rem;
}

.holiday-header h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.holiday-controls-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.year-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.5rem;
}

.year-checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.year-checkbox-item input[type="checkbox"] {
    cursor: pointer;
}

.holiday-overview {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.holiday-overview h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.holiday-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.holiday-card {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 1rem;
    border-left: 4px solid var(--primary-color);
    cursor: pointer;
    transition: all 0.2s;
}

.holiday-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.holiday-card h5 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.holiday-card-stats {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.holiday-card-stat {
    display: flex;
    flex-direction: column;
}

.holiday-card-stat-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.holiday-card-stat-value {
    font-weight: 600;
    color: var(--text-primary);
}

.holiday-card-yoy {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
}

.holiday-card-yoy.positive {
    color: var(--success-color);
}

.holiday-card-yoy.negative {
    color: var(--danger-color);
}

.holiday-comparison {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.comparison-header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.comparison-header-section h4 {
    margin: 0;
    color: var(--text-primary);
}

.holiday-chart-container {
    margin-top: 2rem;
    min-height: 400px;
    background: white;
    border-radius: 8px;
    padding: 1rem;
}

.chart-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.chart-control-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.chart-control-checkbox input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.chart-control-checkbox span {
    font-size: 0.9rem;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .holiday-controls-panel {
        grid-template-columns: 1fr;
    }
    
    .holiday-grid {
        grid-template-columns: 1fr;
    }
}

/* Period Comparison Tab */
.period-section {
    padding: 1.5rem 0;
}

.period-header {
    margin-bottom: 2rem;
}

.period-header h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.period-controls-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.period-overview {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.period-overview h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.period-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.period-comparison {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}