/**
 * Universal Charts CSS Module v1.0.0
 * 
 * A unified, elegant charting system for all visualization types.
 * Supports: horizontal bars, vertical bars, donut charts, comparison grids, sparklines
 * 
 * Design principles:
 * - NO gradients (flat design, solid colors only)
 * - WCAG AA compliant (contrast, touch targets)
 * - Responsive (desktop -> tablet -> mobile)
 * - Dark mode support
 * - Print-friendly
 * - Animated with reduced-motion support
 * 
 * @since v5.34.0
 */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (Chart Design Tokens)
   ========================================================================== */

:root {
    /* Chart dimensions */
    --chart-height: 200px;
    --chart-bar-gap: 1.5rem;
    --chart-bar-min-width: 60px;
    --chart-bar-max-width: 100px;
    --chart-track-height: 12px;
    --chart-touch-target: 44px;
    
    /* Animation */
    --chart-animation-duration: 0.8s;
    --chart-animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Colors - Google Looker palette (solid, no gradients) */
    --chart-color-blue: #4285F4;
    --chart-color-red: #EA4335;
    --chart-color-yellow: #FBBC04;
    --chart-color-green: #34A853;
    --chart-color-purple: #9334E6;
    --chart-color-teal: #009688;
    --chart-color-orange: #F59E0B;
    --chart-color-pink: #EC4899;
    --chart-color-indigo: #6366F1;
    --chart-color-gray: #6B7280;
    
    /* Status colors */
    --chart-color-success: #10B981;
    --chart-color-warning: #F59E0B;
    --chart-color-danger: #EF4444;
    --chart-color-info: #3B82F6;
    
    /* Surface colors */
    --chart-surface: var(--color-surface, #FFFFFF);
    --chart-surface-alt: var(--color-surface-alt, #F8F9FA);
    --chart-border: var(--color-border, rgba(0, 0, 0, 0.08));
    --chart-text: var(--color-text, #1A1A1A);
    --chart-text-muted: var(--color-text-secondary, #6B7280);
}

/* Dark mode tokens */
[data-theme="dark"] {
    --chart-surface: var(--color-surface, #1E293B);
    --chart-surface-alt: var(--color-surface-alt, #0F172A);
    --chart-border: var(--color-border, #334155);
    --chart-text: var(--color-text, #F1F5F9);
    --chart-text-muted: var(--color-text-secondary, #94A3B8);
}

/* ==========================================================================
   BASE CHART CONTAINER
   ========================================================================== */

.uv-chart {
    position: relative;
    margin: var(--space-8, 2rem) auto;
    padding: var(--space-6, 1.5rem);
    background: var(--chart-surface);
    border: 1px solid var(--chart-border);
    border-radius: var(--radius-xl, 16px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    max-width: 100%;
    overflow: visible;
}

.uv-chart__title {
    margin: 0 0 var(--space-4, 1rem) 0;
    font-size: var(--font-size-lg, 1.25rem);
    font-weight: 700;
    color: var(--chart-text);
    text-align: center;
    letter-spacing: -0.02em;
}

.uv-chart__subtitle {
    margin: calc(var(--space-2, 0.5rem) * -1) 0 var(--space-4, 1rem) 0;
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--chart-text-muted);
    text-align: center;
}

.uv-chart__source {
    margin-top: var(--space-4, 1rem);
    padding-top: var(--space-3, 0.75rem);
    border-top: 1px solid var(--chart-border);
    font-size: var(--font-size-xs, 0.75rem);
    color: var(--chart-text-muted);
    font-style: italic;
}

/* ==========================================================================
   HORIZONTAL BAR CHART
   ========================================================================== */

.uv-chart--horizontal {
    max-width: 800px;
}

.uv-hbar {
    display: flex;
    flex-direction: column;
    gap: var(--space-3, 0.75rem);
}

.uv-hbar__row {
    display: flex;
    align-items: center;
    gap: var(--space-4, 1rem);
    min-height: var(--chart-touch-target);
}

.uv-hbar__label {
    flex: 0 0 120px;
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: 500;
    color: var(--chart-text);
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.uv-hbar__track {
    flex: 1;
    height: var(--chart-track-height);
    background: var(--chart-surface-alt);
    border-radius: var(--radius-full, 9999px);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--chart-border);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

.uv-hbar__fill {
    height: 100%;
    border-radius: var(--radius-full, 9999px);
    background: var(--bar-color, var(--chart-color-blue));
    position: relative;
    transition: width var(--chart-animation-duration) var(--chart-animation-easing);
    /* 3D effect without gradients */
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.15),
        0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Highlight effect on top */
.uv-hbar__fill::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 45%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full, 9999px) var(--radius-full, 9999px) 0 0;
    pointer-events: none;
}

.uv-hbar__value {
    flex: 0 0 60px;
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: 700;
    color: var(--chart-text);
    text-align: left;
}

/* Hover/focus states */
.uv-hbar__row:hover .uv-hbar__fill,
.uv-hbar__fill:focus-visible {
    transform: scaleY(1.1);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.35),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2),
        0 4px 8px rgba(0, 0, 0, 0.15);
}

.uv-hbar__fill:focus-visible {
    outline: 2px solid var(--color-primary, #0066CC);
    outline-offset: 2px;
}

/* ==========================================================================
   VERTICAL BAR CHART
   ========================================================================== */

.uv-chart--vertical {
    max-width: 900px;
}

.uv-vbar {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--chart-bar-gap);
    height: var(--chart-height);
    padding: var(--space-4, 1rem);
    position: relative;
}

/* Y-axis gridlines */
.uv-vbar::before {
    content: "";
    position: absolute;
    top: var(--space-4, 1rem);
    bottom: var(--space-4, 1rem);
    left: var(--space-4, 1rem);
    right: var(--space-4, 1rem);
    background: transparent;
    border-top: 1px solid var(--chart-border);
    border-bottom: 1px solid var(--chart-border);
    pointer-events: none;
    z-index: 0;
}

.uv-vbar__group {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    height: 100%;
    min-width: var(--chart-bar-min-width);
    max-width: var(--chart-bar-max-width);
    position: relative;
    z-index: 1;
}

.uv-vbar__bar {
    width: 100%;
    max-width: 80px;
    background: var(--bar-color, var(--chart-color-blue));
    border-radius: var(--radius-md, 8px) var(--radius-md, 8px) 0 0;
    margin-top: auto; /* Push bar to bottom */
    position: relative;
    transition: 
        height var(--chart-animation-duration) var(--chart-animation-easing),
        transform 0.2s ease;
    cursor: pointer;
    /* 3D effect */
    box-shadow:
        inset 2px 0 0 rgba(255, 255, 255, 0.15),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 2px 0 rgba(255, 255, 255, 0.25),
        0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Top highlight */
.uv-vbar__bar::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 35%;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md, 8px) var(--radius-md, 8px) 0 0;
    pointer-events: none;
}

/* Hover effects */
.uv-vbar__group:hover .uv-vbar__bar,
.uv-vbar__bar:focus-visible {
    transform: scaleX(1.05);
    box-shadow:
        inset 2px 0 0 rgba(255, 255, 255, 0.2),
        inset -2px 0 0 rgba(0, 0, 0, 0.15),
        inset 0 2px 0 rgba(255, 255, 255, 0.3),
        0 6px 16px rgba(0, 0, 0, 0.15);
}

.uv-vbar__bar:focus-visible {
    outline: 2px solid var(--color-primary, #0066CC);
    outline-offset: 2px;
}

.uv-vbar__label {
    margin-top: var(--space-2, 0.5rem);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 600;
    color: var(--chart-text);
    text-align: center;
    white-space: nowrap;
}

.uv-vbar__value {
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 700;
    color: var(--chart-text);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.uv-vbar__group:hover .uv-vbar__value {
    opacity: 1;
}

/* ==========================================================================
   DONUT/PIE CHART
   ========================================================================== */

.uv-chart--donut {
    max-width: 500px;
}

.uv-donut {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6, 1.5rem);
}

.uv-donut__ring {
    position: relative;
    width: 200px;
    height: 200px;
}

.uv-donut__svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.uv-donut__segment {
    fill: none;
    stroke-width: 20;
    stroke-linecap: round;
    transition: stroke-dasharray 1s var(--chart-animation-easing);
}

.uv-donut__center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.uv-donut__center-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--chart-text);
    line-height: 1;
}

.uv-donut__center-label {
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--chart-text-muted);
    margin-top: var(--space-1, 0.25rem);
}

.uv-donut__legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4, 1rem);
}

.uv-donut__legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-2, 0.5rem);
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--chart-text);
}

.uv-donut__legend-color {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-sm, 4px);
    flex-shrink: 0;
}

/* ==========================================================================
   COMPARISON GRID (Stats)
   ========================================================================== */

.uv-chart--stats {
    max-width: 900px;
}

.uv-stats {
    display: grid;
    gap: var(--space-4, 1rem);
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.uv-stats--2 { grid-template-columns: repeat(2, 1fr); }
.uv-stats--3 { grid-template-columns: repeat(3, 1fr); }
.uv-stats--4 { grid-template-columns: repeat(4, 1fr); }

.uv-stat {
    padding: var(--space-5, 1.25rem);
    background: var(--chart-surface-alt);
    border-radius: var(--radius-lg, 12px);
    text-align: center;
    border: 1px solid var(--chart-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}

/* Top accent bar */
.uv-stat::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--stat-color, var(--chart-color-blue));
    transform: scaleX(0);
    transition: transform 0.25s ease;
}

.uv-stat:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.uv-stat:hover::before {
    transform: scaleX(1);
}

.uv-stat__icon {
    font-size: 2rem;
    margin-bottom: var(--space-2, 0.5rem);
}

.uv-stat__value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--stat-color, var(--chart-color-blue));
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.uv-stat__label {
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 600;
    color: var(--chart-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: var(--space-2, 0.5rem);
}

.uv-stat__trend {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1, 0.25rem);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 600;
    margin-top: var(--space-2, 0.5rem);
}

.uv-stat__trend--up { color: var(--chart-color-success); }
.uv-stat__trend--down { color: var(--chart-color-danger); }
.uv-stat__trend--neutral { color: var(--chart-text-muted); }

/* ==========================================================================
   SPARKLINE (Mini inline charts)
   ========================================================================== */

.uv-sparkline {
    display: inline-flex;
    align-items: flex-end;
    gap: 2px;
    height: 24px;
    vertical-align: middle;
}

.uv-sparkline__bar {
    width: 4px;
    background: var(--chart-color-blue);
    border-radius: 2px 2px 0 0;
    transition: height 0.3s ease;
}

.uv-sparkline__bar:hover {
    background: var(--chart-color-purple);
}

/* ==========================================================================
   COMPARISON TABLE
   ========================================================================== */

.uv-chart--table {
    max-width: 900px;
    overflow-x: auto;
}

.uv-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm, 0.875rem);
}

.uv-table thead {
    background: var(--color-primary, #0066CC);
    color: #FFFFFF;
}

.uv-table th,
.uv-table td {
    padding: var(--space-3, 0.75rem) var(--space-4, 1rem);
    text-align: left;
    border-bottom: 1px solid var(--chart-border);
}

.uv-table th {
    font-weight: 600;
    white-space: nowrap;
}

.uv-table tbody tr:nth-child(even) {
    background: var(--chart-surface-alt);
}

.uv-table tbody tr:hover {
    background: rgba(0, 102, 204, 0.05);
}

/* Rating badges */
.uv-rating {
    display: inline-block;
    padding: var(--space-1, 0.25rem) var(--space-2, 0.5rem);
    border-radius: var(--radius-sm, 4px);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.uv-rating--excellent {
    background: rgba(16, 185, 129, 0.15);
    color: var(--chart-color-success);
}

.uv-rating--good {
    background: rgba(59, 130, 246, 0.15);
    color: var(--chart-color-info);
}

.uv-rating--fair {
    background: rgba(245, 158, 11, 0.15);
    color: var(--chart-color-warning);
}

.uv-rating--poor {
    background: rgba(239, 68, 68, 0.15);
    color: var(--chart-color-danger);
}

/* ==========================================================================
   COLOR MODIFIERS
   ========================================================================== */

.uv-color-blue { --bar-color: var(--chart-color-blue); --stat-color: var(--chart-color-blue); }
.uv-color-red { --bar-color: var(--chart-color-red); --stat-color: var(--chart-color-red); }
.uv-color-yellow { --bar-color: var(--chart-color-yellow); --stat-color: var(--chart-color-yellow); }
.uv-color-green { --bar-color: var(--chart-color-green); --stat-color: var(--chart-color-green); }
.uv-color-purple { --bar-color: var(--chart-color-purple); --stat-color: var(--chart-color-purple); }
.uv-color-teal { --bar-color: var(--chart-color-teal); --stat-color: var(--chart-color-teal); }
.uv-color-orange { --bar-color: var(--chart-color-orange); --stat-color: var(--chart-color-orange); }
.uv-color-pink { --bar-color: var(--chart-color-pink); --stat-color: var(--chart-color-pink); }
.uv-color-indigo { --bar-color: var(--chart-color-indigo); --stat-color: var(--chart-color-indigo); }
.uv-color-gray { --bar-color: var(--chart-color-gray); --stat-color: var(--chart-color-gray); }
.uv-color-success { --bar-color: var(--chart-color-success); --stat-color: var(--chart-color-success); }
.uv-color-warning { --bar-color: var(--chart-color-warning); --stat-color: var(--chart-color-warning); }
.uv-color-danger { --bar-color: var(--chart-color-danger); --stat-color: var(--chart-color-danger); }

/* ==========================================================================
   RESPONSIVE ADJUSTMENTS
   ========================================================================== */

/* Tablet */
@media (max-width: 1024px) {
    .uv-chart {
        padding: var(--space-5, 1.25rem);
    }
    
    .uv-stats--4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .uv-vbar {
        gap: var(--space-4, 1rem);
    }
    
    .uv-stat__value {
        font-size: 2rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .uv-chart {
        padding: var(--space-4, 1rem);
        border-radius: var(--radius-lg, 12px);
    }
    
    .uv-hbar__label {
        flex: 0 0 80px;
        font-size: var(--font-size-xs, 0.75rem);
    }
    
    .uv-hbar__value {
        flex: 0 0 50px;
        font-size: var(--font-size-xs, 0.75rem);
    }
    
    .uv-stats--3,
    .uv-stats--4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .uv-vbar {
        height: 160px;
    }
    
    .uv-vbar__label {
        font-size: 0.65rem;
    }
    
    .uv-donut__ring {
        width: 160px;
        height: 160px;
    }
    
    .uv-donut__center-value {
        font-size: 2rem;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .uv-hbar__row {
        flex-wrap: wrap;
    }
    
    .uv-hbar__label {
        flex: 1 1 100%;
        text-align: left;
        margin-bottom: var(--space-1, 0.25rem);
    }
    
    .uv-hbar__track {
        flex: 1;
        min-width: calc(100% - 60px);
    }
    
    .uv-stats--2,
    .uv-stats--3,
    .uv-stats--4 {
        grid-template-columns: 1fr;
    }
    
    .uv-stat__value {
        font-size: 1.75rem;
    }
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .uv-hbar__fill,
    .uv-vbar__bar,
    .uv-donut__segment,
    .uv-stat,
    .uv-sparkline__bar {
        transition: none !important;
    }
    
    .uv-stat:hover {
        transform: none;
    }
    
    .uv-vbar__group:hover .uv-vbar__bar,
    .uv-hbar__row:hover .uv-hbar__fill {
        transform: none;
    }
}

/* ==========================================================================
   DARK MODE
   ========================================================================== */

[data-theme="dark"] .uv-chart {
    background: var(--chart-surface);
    border-color: var(--chart-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .uv-hbar__track,
[data-theme="dark"] .uv-stat {
    background: var(--chart-surface-alt);
    border-color: var(--chart-border);
}

[data-theme="dark"] .uv-table thead {
    background: var(--color-primary, #0066CC);
}

[data-theme="dark"] .uv-table tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .uv-table tbody tr:hover {
    background: rgba(0, 102, 204, 0.1);
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */

@media print {
    .uv-chart {
        border: 1px solid #ccc !important;
        box-shadow: none !important;
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .uv-hbar__fill,
    .uv-vbar__bar {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }
    
    .uv-stat:hover,
    .uv-vbar__group:hover .uv-vbar__bar,
    .uv-hbar__row:hover .uv-hbar__fill {
        transform: none !important;
    }
}

/* ==========================================================================
   ACCESSIBILITY ENHANCEMENTS
   ========================================================================== */

/* Ensure all interactive chart elements have proper focus indicators */
.uv-hbar__fill[tabindex],
.uv-vbar__bar[tabindex],
.uv-stat[tabindex],
.uv-donut__segment[tabindex] {
    cursor: pointer;
}

.uv-hbar__fill[tabindex]:focus-visible,
.uv-vbar__bar[tabindex]:focus-visible,
.uv-stat[tabindex]:focus-visible {
    outline: 3px solid var(--color-primary, #0066CC);
    outline-offset: 2px;
}

/* Screen reader only text for chart data */
.uv-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}