/**
 * Modern Charts Stylesheet
 * Advanced chart styling for ECharts and ApexCharts components
 * Matches the modern reference designs with:
 * - Sankey Flow Charts
 * - Dot Matrix Charts  
 * - Dual Line Comparison Charts
 * - Butterfly/Population Pyramid Charts
 */

/* ================================================
   CSS CUSTOM PROPERTIES
   ================================================ */
:root {
    /* Chart Colors */
    --chart-primary: #3B82F6;
    --chart-secondary: #8B5CF6;
    --chart-tertiary: #06B6D4;
    --chart-success: #10B981;
    --chart-warning: #F59E0B;
    --chart-danger: #EF4444;
    --chart-pink: #EC4899;
    
    /* Comparison Colors */
    --chart-current: #F97316;
    --chart-previous: #3B82F6;
    
    /* Butterfly Colors */
    --chart-left: #3B82F6;
    --chart-right: #10B981;
    
    /* Dot Matrix Colors */
    --dot-primary: #06B6D4;
    --dot-secondary: #3B82F6;
    
    /* UI Colors */
    --chart-bg: #FFFFFF;
    --chart-border: #E5E7EB;
    --chart-text: #374151;
    --chart-text-muted: #9CA3AF;
    --chart-grid: #E5E7EB;
    
    /* Shadows */
    --chart-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --chart-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --chart-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
    
    /* Radius */
    --chart-radius-sm: 6px;
    --chart-radius-md: 8px;
    --chart-radius-lg: 12px;
    
    /* Spacing */
    --chart-space-1: 4px;
    --chart-space-2: 8px;
    --chart-space-3: 12px;
    --chart-space-4: 16px;
    --chart-space-5: 20px;
    --chart-space-6: 24px;
}

/* ================================================
   MODERN CHART CARD
   ================================================ */
.modern-chart-card {
    background: var(--chart-bg);
    border-radius: var(--chart-radius-lg);
    box-shadow: var(--chart-shadow-sm);
    border: 1px solid var(--chart-border);
    overflow: hidden;
    transition: all 0.2s ease;
}

.modern-chart-card:hover {
    box-shadow: var(--chart-shadow-md);
}

/* Card Header */
.modern-chart-header {
    padding: var(--chart-space-5) var(--chart-space-6);
    border-bottom: 1px solid var(--chart-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--chart-space-3);
}

.modern-chart-header-left {
    display: flex;
    align-items: center;
    gap: var(--chart-space-3);
}

.modern-chart-header-left i {
    font-size: 16px;
    color: var(--chart-text-muted);
}

.modern-chart-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--chart-text);
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.modern-chart-subtitle {
    font-size: 11px;
    color: var(--chart-text-muted);
    margin-top: 2px;
}

/* Card Actions */
.modern-chart-actions {
    display: flex;
    align-items: center;
    gap: var(--chart-space-2);
}

.chart-action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--chart-space-1);
    padding: var(--chart-space-1) var(--chart-space-3);
    border: 1px solid var(--chart-border);
    border-radius: var(--chart-radius-sm);
    background: var(--chart-bg);
    font-size: 12px;
    color: var(--chart-text);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.chart-action-btn:hover {
    background: #F9FAFB;
    border-color: #D1D5DB;
}

.chart-action-btn i {
    font-size: 14px;
}

.chart-action-btn.active {
    background: var(--chart-primary);
    border-color: var(--chart-primary);
    color: white;
}

/* Card Body */
.modern-chart-body {
    padding: var(--chart-space-4) var(--chart-space-6);
    position: relative;
}

.modern-chart-wrapper {
    min-height: 300px;
}

/* Card Footer / Summary */
.chart-summary-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--chart-space-4) var(--chart-space-6);
    background: #F9FAFB;
    border-top: 1px solid var(--chart-border);
    flex-wrap: wrap;
    gap: var(--chart-space-4);
}

.chart-summary-item {
    text-align: center;
    flex: 1;
    min-width: 80px;
}

.chart-summary-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--chart-text);
    font-variant-numeric: tabular-nums;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.chart-summary-value.positive {
    color: var(--chart-success);
}

.chart-summary-value.negative {
    color: var(--chart-danger);
}

.chart-summary-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--chart-text-muted);
    margin-top: 2px;
}

/* ================================================
   PERIOD BADGE
   ================================================ */
.period-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--chart-space-1);
    padding: var(--chart-space-1) var(--chart-space-3);
    border-radius: var(--chart-radius-sm);
    font-size: 11px;
    font-weight: 500;
    background: #EFF6FF;
    color: #2563EB;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.period-badge i {
    font-size: 12px;
}

.period-badge.success {
    background: #D1FAE5;
    color: #059669;
}

.period-badge.warning {
    background: #FEF3C7;
    color: #D97706;
}

/* ================================================
   CHART LEGEND INDICATORS
   ================================================ */
.chart-legend {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--chart-text);
}

.chart-legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.chart-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.chart-legend-dot.primary {
    background: var(--chart-primary);
}

.chart-legend-dot.secondary {
    background: var(--chart-secondary);
}

.chart-legend-dot.success {
    background: var(--chart-success);
}

.chart-legend-dot.warning {
    background: var(--chart-warning);
}

.chart-legend-dot.current {
    background: var(--chart-current);
}

.chart-legend-dot.previous {
    background: var(--chart-previous);
}

/* ================================================
   FILTER/SORT BUTTONS (matching reference)
   ================================================ */
.chart-filter-group {
    display: flex;
    align-items: center;
    gap: var(--chart-space-2);
}

.chart-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--chart-space-2);
    padding: var(--chart-space-2) var(--chart-space-4);
    border: 1px solid var(--chart-border);
    border-radius: var(--chart-radius-sm);
    background: var(--chart-bg);
    font-size: 13px;
    color: var(--chart-text);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.chart-filter-btn:hover {
    background: #F9FAFB;
    border-color: #D1D5DB;
}

.chart-filter-btn i {
    font-size: 14px;
    color: var(--chart-text-muted);
}

.chart-sort-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--chart-space-2);
    padding: var(--chart-space-2) var(--chart-space-4);
    border: 1px solid var(--chart-border);
    border-radius: var(--chart-radius-sm);
    background: var(--chart-bg);
    font-size: 13px;
    color: var(--chart-text);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.chart-sort-btn:hover {
    background: #F9FAFB;
}

.chart-sort-btn i {
    font-size: 14px;
}

.chart-more-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--chart-border);
    border-radius: var(--chart-radius-sm);
    background: var(--chart-bg);
    color: var(--chart-text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.chart-more-btn:hover {
    background: #F9FAFB;
    color: var(--chart-text);
}

.chart-more-btn i {
    font-size: 16px;
}

/* ================================================
   TOOLTIP OVERRIDES (dark theme)
   ================================================ */
.apexcharts-tooltip.apexcharts-theme-dark {
    background: #1F2937 !important;
    border: 1px solid #374151 !important;
    border-radius: var(--chart-radius-md) !important;
    box-shadow: var(--chart-shadow-lg) !important;
}

.apexcharts-tooltip.apexcharts-theme-dark .apexcharts-tooltip-title {
    background: #111827 !important;
    border-bottom: 1px solid #374151 !important;
    padding: 10px 14px !important;
    font-weight: 600 !important;
}

.apexcharts-tooltip.apexcharts-theme-dark .apexcharts-tooltip-series-group {
    padding: 6px 14px !important;
}

/* ================================================
   LOADING STATE
   ================================================ */
.chart-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--chart-text-muted);
}

.chart-loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--chart-border);
    border-top-color: var(--chart-primary);
    border-radius: 50%;
    animation: chart-spin 0.8s linear infinite;
}

@keyframes chart-spin {
    to {
        transform: rotate(360deg);
    }
}

/* ================================================
   EMPTY STATE
   ================================================ */
.chart-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--chart-text-muted);
    text-align: center;
    padding: var(--chart-space-6);
}

.chart-empty-state i {
    font-size: 40px;
    opacity: 0.4;
    margin-bottom: var(--chart-space-3);
}

.chart-empty-state-text {
    font-size: 13px;
    max-width: 200px;
}

/* ================================================
   RESPONSIVE ADJUSTMENTS
   ================================================ */
@media (max-width: 768px) {
    .modern-chart-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .modern-chart-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .chart-summary-row {
        justify-content: center;
    }
    
    .chart-summary-item {
        flex: 0 0 auto;
    }
    
    .chart-filter-group {
        flex-wrap: wrap;
    }
}

/* ================================================
   DARK MODE SUPPORT
   ================================================ */
@media (prefers-color-scheme: dark) {
    .modern-chart-card {
        background: #1F2937;
        border-color: #374151;
    }
    
    .modern-chart-header {
        border-color: #374151;
    }
    
    .modern-chart-title {
        color: #F9FAFB;
    }
    
    .chart-summary-row {
        background: #111827;
        border-color: #374151;
    }
    
    .chart-summary-value {
        color: #F9FAFB;
    }
    
    .chart-action-btn,
    .chart-filter-btn,
    .chart-sort-btn {
        background: #374151;
        border-color: #4B5563;
        color: #E5E7EB;
    }
    
    .chart-action-btn:hover,
    .chart-filter-btn:hover,
    .chart-sort-btn:hover {
        background: #4B5563;
    }
}