/* Stochastic Splats Explorer (variance widget). All rules are scoped to .variance-widget. */

.variance-widget {
    /* White background theme */
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-dark: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;

    /* Viridis palette accents */
    --viridis-purple: #440154;
    --viridis-blue: #3b528b;
    --viridis-teal: #21918c;
    --viridis-green: #5ec962;
    --viridis-yellow: #fde725;

    color: var(--text-primary);
    user-select: none;
}

.variance-widget .scene-buttons {
    margin-bottom: 1rem;
}

.variance-widget .variance-body {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

/* 1. Main Canvas Card (Center) */
.variance-widget .canvas-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    min-width: 0;
}

.variance-widget .canvas-wrapper {
    position: relative;
    display: inline-block;
    border-radius: 6px;
    overflow: visible; /* Allow floating loupe to extend slightly if needed */
    user-select: none;
    background-color: #000;
    touch-action: pan-y; /* sideways swipes inspect pixels or move the divider, vertical ones scroll the page */
}

#variance-imageCanvas {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

#variance-overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Clean Split Labels on Image */
.variance-widget .split-label-left, .variance-widget .split-label-right {
    position: absolute;
    top: 10px;
    background-color: #ffffff;
    color: #0f172a;
    font-size: 0.82rem;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 6px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    pointer-events: none;
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.variance-widget .split-label-left {
    left: 12px;
}

.variance-widget .split-label-right {
    right: 12px;
}

.variance-widget .pause-badge {
    position: absolute;
    bottom: 10px;
    right: 12px;
    background-color: rgba(15, 23, 42, 0.85);
    color: #ffffff;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 4px;
    pointer-events: none;
    display: none;
}

/* Floating Magnified Loupe View (appears top-left of mouse on hover) */
.variance-widget .floating-loupe {
    position: absolute;
    width: 140px;
    height: 140px;
    border: 2px solid #ffffff;
    border-radius: 8px;
    overflow: hidden;
    background: #000;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.2);
    pointer-events: none;
    display: none;
    z-index: 30;
}

#variance-loupeCanvas {
    display: block;
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
}

/* Yellow box around the center pixel of the 21x21 loupe, as in the K-buffer explorer */
.variance-widget .loupe-crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    width: calc(100% / 21);
    height: calc(100% / 21);
    box-sizing: content-box; /* the border goes around the pixel */
    transform: translate(-50%, -50%);
    border: 2px solid #fde725;
}

/* Shown while a pixel is locked, as in the K-buffer explorer (the λ labels take the top corners) */
.variance-widget .lock-badge {
    position: absolute;
    bottom: 10px;
    left: 12px;
    display: none;
    background: rgba(15, 23, 42, 0.85);
    color: #fde68a;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 6px;
    pointer-events: none;
}

/* 2. Compact Distribution Panels (Left & Right) */
.variance-widget .distribution-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.variance-widget .model-header {
    text-align: center;
    margin-bottom: 12px;
}

.variance-widget .model-variance {
    font-size: 0.92rem;
    font-weight: 700;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    color: var(--text-primary);
}

.variance-widget .bar-circle-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

/* Vertical Stacked Bar */
.variance-widget .vertical-stacked-bar {
    width: 52px;
    height: 310px;
    background-color: #000000;
    border: 1px solid var(--border-dark);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    flex-direction: column-reverse; /* Stack from bottom to top */
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    position: relative;
}

.variance-widget .v-bar-segment {
    width: 100%;
    transition: opacity 0.1s;
    cursor: pointer;
}

.variance-widget .v-bar-segment:hover {
    opacity: 0.85;
    outline: 2px solid var(--viridis-yellow);
    z-index: 2;
}

/* Converged Color Circle - Placed below bar and matching width (52px) */
.variance-widget .converged-circle {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid var(--border-dark);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
    cursor: pointer;
    transition: transform 0.15s, background-color 0.1s;
    flex-shrink: 0;
}

.variance-widget .converged-circle:hover {
    transform: scale(1.08);
    outline: 2px solid var(--viridis-yellow);
}

/* Covers the panels and the image (not the scene buttons) while scene data loads */
.variance-widget .loading-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 40;
    gap: 16px;
}

.variance-widget .spinner {
    width: 44px;
    height: 44px;
    border: 4px solid var(--border-color);
    border-top-color: var(--viridis-teal);
    border-radius: 50%;
    animation: variance-spin 0.8s linear infinite;
}

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

/* Tooltip */
#variance-tooltip {
    position: fixed;
    background-color: rgba(15, 23, 42, 0.94);
    color: #ffffff;
    border: 1px solid var(--border-dark);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.76rem;
    pointer-events: none;
    display: none;
    z-index: 50;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* Below desktop width, the image would shrink too much between the panels: image on top,
   each distribution panel centered below the half of the image it belongs to.
   (1023.98px instead of 1023px, so fractional viewport widths at 150% display scaling are covered too) */
@media screen and (max-width: 1023.98px) {
    .variance-widget .variance-body {
        display: grid;
        grid-template-columns: auto auto;
        justify-content: center;
        justify-items: center;
    }

    .variance-widget .canvas-card {
        grid-column: 1 / -1;
        order: -1;
    }

    .variance-widget .vertical-stacked-bar {
        height: 200px;
    }
}

@media screen and (max-width: 768px) {
    .variance-widget .floating-loupe {
        width: 100px;
        height: 100px;
    }
}

/* Touch screens have no Space key: the badge stays visible there as a pause button */
@media (hover: none) {
    .variance-widget .pause-badge {
        pointer-events: auto;
        cursor: pointer;
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}