/* History-based spatial resampling widgets (toy example, K-buffer explorer, convergence and ablation comparisons).
   All rules are scoped to .kbuffer-widget. Breakpoints: 1024px (the toy's four steps fit in one row), 899.98px
   (side-by-side panels stack; .98 covers fractional viewport widths at 150% display scaling) and 768px (phones, as
   for the rest of the page). */

.kbuffer-widget {
    --border-color: #e2e8f0;
    --border-dark: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --kb-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

    /* Viridis palette accents */
    --viridis-blue: #31688e;
    --viridis-teal: #21918c;
    --viridis-green: #5ec962;
    --viridis-yellow: #fde725;
    --slot-active: #3b82f6;

    color: var(--text-primary);
}

.kbuffer-widget .kb-mono {
    font-family: var(--kb-mono);
}

.kbuffer-widget .widget-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    padding: 16px;
}

.kbuffer-widget .card-title,
.kbuffer-widget .section-title {
    font-family: 'Jost', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: #1e293b;
}

.kbuffer-widget .card-title {
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 8px;
    margin-bottom: 12px;
}

.kbuffer-widget .row-label,
.kbuffer-widget .scene-label {
    font-weight: 500;
    margin-right: 4px;
}

/* ============================================================================================================
   2-pixel toy example
   ============================================================================================================ */

/* 2x2 between phone and desktop widths; the four steps fit in one row only at desktop width (end of section) */
.kbuffer-toy .toy-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.kbuffer-toy .toy-group {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.kbuffer-toy .toy-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 8px;
}

.kbuffer-toy .toy-group-title {
    font-family: 'Jost', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    color: #1e293b;
}

.kbuffer-toy .toy-group-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 999px;
    white-space: nowrap;
}

.kbuffer-toy .badge-truth {
    background: #f1f5f9;
    color: var(--text-secondary);
    border: 1px solid var(--border-dark);
}

.kbuffer-toy .badge-raw {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.kbuffer-toy .badge-weights {
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
}

.kbuffer-toy .badge-ours {
    background: #ecfdf5;
    color: #059669;
    border: 1px solid #a7f3d0;
}

.kbuffer-toy .toy-reference-layout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin: 6px 0;
}

.kbuffer-toy .toy-sample-layout {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    margin: 6px 0;
}

.kbuffer-toy .toy-weights-layout {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    min-height: 80px;
    margin: 6px 0;
}

.kbuffer-toy .toy-weight-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px 8px;
}

.kbuffer-toy .toy-weight-formula {
    font-size: 0.8rem;
    color: #1e293b;
}

.kbuffer-toy .toy-weight-eq {
    margin-left: auto; /* keeps "= value" together on the right in wide rows */
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
}

.kbuffer-toy .toy-weight-val {
    font-size: 0.8rem;
    font-weight: 700;
    color: #2563eb;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 4px;
    padding: 1px 5px;
    min-width: 38px;
    text-align: center;
}

.kbuffer-toy .toy-dist-pane {
    flex: 1;
    min-width: 0;
    max-width: 150px;
    text-align: center;
}

.kbuffer-toy .toy-dist-label {
    font-size: 0.75rem;
    font-weight: 700;
    display: block;
    margin-bottom: 2px;
}

.kbuffer-toy .toy-dist-svg {
    display: block;
    width: 100%;
    height: auto;
}

.kbuffer-toy .toy-pixels-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.kbuffer-toy .toy-pixel-pair {
    display: flex;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
    border: 1.5px solid #334155;
}

.kbuffer-toy .toy-pixel {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.25s ease;
}

.kbuffer-toy .toy-pixel-tag {
    font-family: var(--kb-mono);
    font-size: 0.72rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.7);
}

.kbuffer-toy .toy-pixels-caption {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-align: center;
}

.kbuffer-toy .toy-metric-bar {
    margin-top: 8px;
    padding: 5px 10px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.78rem;
}

.kbuffer-toy .toy-metric-bar.highlight-resampled {
    background: #f0fdf4;
    border-color: #bbf7d0;
}

.kbuffer-toy .toy-metric-label {
    color: var(--text-muted);
    font-weight: 600;
    white-space: nowrap;
}

.kbuffer-toy .toy-metric-val {
    font-family: var(--kb-mono);
    font-weight: 700;
}

.kbuffer-toy .toy-reduction-badge {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 1px 6px;
    border-radius: 4px;
    margin-left: 4px;
    white-space: nowrap;
}

.kbuffer-toy .badge-better {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #86efac;
}

.kbuffer-toy .badge-worse {
    background: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fca5a5;
}

.kbuffer-toy .toy-actions {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

/* One row: badges below the titles and smaller pixels leave room for the content of the narrow columns */
@media screen and (min-width: 1024px) {
    .kbuffer-toy .toy-grid {
        grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr) minmax(0, 1.05fr) minmax(0, 1fr);
    }

    .kbuffer-toy .toy-group-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .kbuffer-toy .toy-pixel {
        width: 40px;
        height: 40px;
    }
}

/* ============================================================================================================
   K-buffer explorer
   ============================================================================================================ */

.kbuffer-explorer .explorer-top {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.kbuffer-explorer .image-card {
    padding: 12px;
}

/* Sideways swipes inspect pixels, vertical ones scroll the page */
.kbuffer-explorer .canvas-wrapper {
    position: relative;
    background: #000000;
    border-radius: 8px;
    cursor: crosshair;
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y;
}

#kbuffer-imageCanvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
    image-rendering: pixelated;
}

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

.kbuffer-explorer .image-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #e2e8f0;
    font-size: 0.9rem;
    font-weight: 600;
    pointer-events: none;
}

.kbuffer-explorer .lock-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    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;
}

.kbuffer-explorer .floating-loupe {
    position: absolute;
    width: 150px;
    height: 150px;
    border: 3px solid #ffffff;
    border-radius: 10px;
    overflow: hidden;
    background: #000000;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
    pointer-events: none;
    display: none;
    z-index: 30;
}

.kbuffer-explorer .loupe-canvas {
    display: block;
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
}

/* Yellow box around the center pixel of the 15x15 loupe */
.kbuffer-explorer .loupe-crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    width: calc(100% / 15);
    height: calc(100% / 15);
    box-sizing: content-box; /* the border goes around the pixel */
    transform: translate(-50%, -50%);
    border: 2px solid var(--viridis-yellow);
}

.kbuffer-explorer .controls-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.kbuffer-explorer .playback-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kbuffer-explorer .playback-row .button {
    flex-shrink: 0;
}

.kbuffer-explorer .frame-slider {
    flex: 1;
    min-width: 60px;
    accent-color: var(--viridis-blue);
    cursor: pointer;
}

.kbuffer-explorer .frame-badge {
    font-family: var(--kb-mono);
    font-size: 0.85rem;
    font-weight: 700;
    background: #0f172a;
    color: #ffffff;
    padding: 3px 10px;
    border-radius: 6px;
    white-space: nowrap;
}

.kbuffer-explorer .view-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.kbuffer-explorer .badge-group {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-left: 8px;
}

.kbuffer-explorer .metrics-badge {
    font-family: var(--kb-mono);
    font-size: 0.8rem;
    font-weight: 600;
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #bfdbfe;
    padding: 2px 8px;
    border-radius: 6px;
}

/* Panels showing pixel data are dimmed while the data of the inspected pixel loads */
.kbuffer-explorer.is-loading-pixel .data-panel > :not(.pixel-status) {
    opacity: 0.45;
    transition: opacity 0.2s ease;
}

.kbuffer-explorer .compute-card {
    position: relative;
}

.kbuffer-explorer .pixel-status {
    position: absolute;
    top: 8px;
    right: 14px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    z-index: 1;
}

/* ---- 3x3 neighborhood ---- */

/* As tall as the image card, with the panels and the formula centered vertically */
.kbuffer-explorer .neighborhood-card {
    display: flex;
    flex-direction: column;
}

.kbuffer-explorer .neighborhood-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: auto;
}

.kbuffer-explorer .neighborhood-card .nh-formula {
    margin-bottom: auto;
}

.kbuffer-explorer .nh-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
    flex: 1;
    min-width: 0;
    max-width: 240px;
}

.kbuffer-explorer .nh-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 6px;
}

.kbuffer-explorer .nh-svg {
    display: block;
    width: 100%;
    max-width: 220px;
    height: auto;
}

.kbuffer-explorer .nh-arrow-item {
    cursor: pointer;
}

.kbuffer-explorer .nh-arrow-hitbox {
    stroke: transparent;
    stroke-width: 16;
    pointer-events: stroke;
}

.kbuffer-explorer .nh-arrow-line {
    transition: stroke 0.15s ease, stroke-width 0.15s ease;
}

/* Weight badges show on hover, or after a tap on touch screens */
.kbuffer-explorer .nh-arrow-badge {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

.kbuffer-explorer .nh-arrow-badge rect {
    fill: #1e293b;
    stroke: #ffffff;
    stroke-width: 1;
}

.kbuffer-explorer .nh-arrow-badge text {
    fill: #ffffff;
    font-size: 11px;
    font-weight: 700;
}

.kbuffer-explorer .nh-arrow-item:hover .nh-arrow-badge,
.kbuffer-explorer .nh-arrow-item.is-active .nh-arrow-badge {
    opacity: 1;
}

.kbuffer-explorer .nh-arrow-item:hover .nh-arrow-line,
.kbuffer-explorer .nh-arrow-item.is-active .nh-arrow-line {
    filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.95)) brightness(1.25);
}

.kbuffer-explorer .nh-transition {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--viridis-teal);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.kbuffer-explorer .nh-transition-caption {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.15;
    margin-top: 4px;
}

.kbuffer-explorer .nh-formula {
    margin-top: 10px;
    padding: 6px 12px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    font-size: 0.9rem;
}

/* ---- Computation grid ---- */

.kbuffer-explorer .compute-row {
    display: flex;
    align-items: stretch;
    gap: 10px;
}

/* Rotated labels at the left of the rows */
.kbuffer-explorer .row-side-label {
    width: 26px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    padding: 6px 0;
}

.kbuffer-explorer .row-side-label span {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    white-space: nowrap;
    font-family: 'Jost', sans-serif;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
}

.kbuffer-explorer .label-new-sample {
    background: linear-gradient(180deg, #ecfdf5 0%, #d1fae5 100%);
    border: 1px solid #a7f3d0;
    color: #047857;
}

.kbuffer-explorer .label-past-samples {
    background: linear-gradient(180deg, #eff6ff 0%, #dbeafe 100%);
    border: 1px solid #bfdbfe;
    color: #1d4ed8;
}

.kbuffer-explorer .row-side-label-spacer {
    width: 26px;
    flex-shrink: 0;
}

.kbuffer-explorer .row-upstream {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 10px;
}

.kbuffer-explorer .intuition-banner {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 0.76rem;
    font-weight: 600;
    color: #166534;
    line-height: 1.35;
}

.kbuffer-explorer .intuition-banner svg {
    color: #22c55e;
    flex-shrink: 0;
}

.kbuffer-explorer .upstream-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex: 1;
}

/* The labels sit above their cells outside the layout, so ÷ and = center on the cells, not on cells and labels */
.kbuffer-explorer .flow-group {
    display: flex;
    align-items: center;
    gap: 6px;
    padding-top: 22px;
}

.kbuffer-explorer .flow-group .compute-box {
    position: relative;
}

.kbuffer-explorer .flow-group .compute-box-sub {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
}

.kbuffer-explorer .sample-card {
    display: flex;
    flex-direction: column;
    gap: 3px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 8px;
    min-width: 170px;
    font-size: 0.72rem;
}

.kbuffer-explorer .swatch-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 3px;
}

.kbuffer-explorer .color-swatch {
    width: 34px;
    height: 34px;
    border-radius: 6px;
    border: 2px solid var(--border-dark);
    background: #000000;
    flex-shrink: 0;
}

.kbuffer-explorer .swatch-info {
    display: flex;
    flex-direction: column;
}

.kbuffer-explorer .summary-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
}

.kbuffer-explorer .swatch-rgb {
    font-size: 0.78rem;
    font-weight: 700;
}

.kbuffer-explorer .meta-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
}

.kbuffer-explorer .meta-item .tag {
    font-size: 0.7rem;
    font-weight: 700;
    height: 1.5em;
    padding: 0 5px;
}

.kbuffer-explorer .sample-eval-note {
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-left: 3px solid #059669;
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 0.74rem;
    color: var(--text-secondary);
    line-height: 1.45;
    flex: 1;
    max-width: 290px;
}

.kbuffer-explorer .sample-eval-note .eval-note-title {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.kbuffer-explorer .compute-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.kbuffer-explorer .compute-box-title {
    font-size: 0.76rem;
    font-weight: 700;
    color: #0f172a;
}

.kbuffer-explorer .compute-box-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 2px;
    line-height: 1.2;
}

.kbuffer-explorer .math-operator {
    font-size: 1.4rem;
    font-weight: 800;
    color: #94a3b8;
    flex-shrink: 0;
    user-select: none;
}

.kbuffer-explorer .row-result {
    width: 154px;
    flex-shrink: 0;
    display: flex;
}

.kbuffer-explorer .result-box {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
}

.kbuffer-explorer .product-box {
    border: 1.5px solid var(--viridis-teal);
    background: #f8fafc;
}

.kbuffer-explorer .final-box {
    border: 2px solid var(--viridis-teal);
    box-shadow: 0 2px 8px rgba(33, 145, 140, 0.15);
}

.kbuffer-explorer .product-sub {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.kbuffer-explorer .occluder-tag {
    font-size: 0.62rem;
    font-weight: 700;
    height: 1.4em;
    padding: 0 5px;
}

/* Operators between the rows, centered over the result column */
.kbuffer-explorer .vertical-op-row {
    display: flex;
    justify-content: flex-end;
    height: 28px;
}

.kbuffer-explorer .vertical-op {
    width: 154px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 28px;
    color: var(--text-muted);
    user-select: none;
}

.kbuffer-explorer .vertical-op.equals {
    color: var(--viridis-teal);
}

/* 3x3 crosses of square cells */
.kbuffer-explorer .directional-cross {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 40px);
    grid-template-rows: repeat(3, 40px);
    width: 120px;
    height: 120px;
    flex-shrink: 0;
}

.kbuffer-explorer .directional-cross.mini {
    grid-template-columns: repeat(3, 26px);
    grid-template-rows: repeat(3, 26px);
    width: 78px;
    height: 78px;
    margin: 3px auto 0;
}

.kbuffer-explorer .cross-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
    border: 1px solid rgba(15, 23, 42, 0.22);
    font-family: var(--kb-mono);
    font-size: 0.72rem;
    font-weight: 700;
    color: #0f172a;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.kbuffer-explorer .directional-cross.mini .cross-cell {
    font-size: 0.58rem;
    letter-spacing: -0.4px;
}

.kbuffer-explorer .cross-cell.empty {
    visibility: hidden;
}

.kbuffer-explorer .divisor-cell {
    width: 40px;
    height: 40px;
    border-radius: 4px;
}

/* The opacities lie translucently over an illustration of the sampled Gaussian */
.kbuffer-explorer .raw-alpha-cross {
    border-radius: 6px;
    background: #f8fafc;
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.1);
}

.kbuffer-explorer .gaussian-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 120px;
    height: 120px;
    border-radius: 6px;
    pointer-events: none;
}

.kbuffer-explorer .raw-alpha-cross .cross-cell {
    position: relative;
}

/* ---- K-buffer slots ---- */

.kbuffer-explorer .slots-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
    flex: 1;
}

.kbuffer-explorer .slot-card {
    flex: 1;
    min-width: 84px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 5px 6px;
    transition: all 0.15s ease;
}

.kbuffer-explorer .slot-card.slot-behind {
    background: #f1f5f9;
    border-color: var(--border-dark);
    opacity: 0.82;
}

.kbuffer-explorer .slot-card.slot-behind .cross-cell:not(.empty) {
    background-color: #e2e8f0 !important;
    color: var(--text-muted) !important;
    border-color: var(--border-dark) !important;
}

.kbuffer-explorer .slot-card.slot-occluding {
    border-color: #86efac;
    box-shadow: 0 1px 4px rgba(16, 185, 129, 0.15);
}

/* The slot that receives the current sample at the end of the frame */
.kbuffer-explorer .slot-card.active-insert {
    border-color: var(--slot-active);
    box-shadow: 0 0 0 1px var(--slot-active);
}

.kbuffer-explorer .slot-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.kbuffer-explorer .slot-status-pill {
    font-size: 0.62rem;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 4px;
}

.kbuffer-explorer .status-occluding {
    background: #dcfce7;
    color: #166534;
}

.kbuffer-explorer .status-behind {
    background: #e2e8f0;
    color: var(--text-muted);
}

.kbuffer-explorer .slot-stat {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 4px;
    font-size: 0.66rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ---- Explanation of the weights ---- */

.kbuffer-explorer .explanation-pane {
    background: #ffffff;
}

.kbuffer-explorer .explanation {
    font-size: 0.78rem;
    color: #334155;
    line-height: 1.45;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 10px;
}

.kbuffer-explorer .explanation ul {
    margin: 3px 0 0 1.1em;
    list-style: disc;
}

/* ============================================================================================================
   Convergence plot and 3-way comparison
   ============================================================================================================ */

.kbuffer-convergence .threeway-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

.kbuffer-convergence .plot-card {
    padding: 14px;
}

.kbuffer-convergence .plot-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.kbuffer-convergence .plot-metric-toggles {
    display: inline-flex;
    gap: 4px;
    background: #f1f5f9;
    padding: 2px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
}

.kbuffer-convergence .plot-metric-btn {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.kbuffer-convergence .plot-metric-btn:hover {
    color: #0f172a;
}

.kbuffer-convergence .plot-metric-btn.active {
    background: #0f172a;
    color: #ffffff;
}

.kbuffer-convergence .plot-sample-selectors {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px 10px;
    margin-bottom: 10px;
    padding: 6px 10px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.kbuffer-convergence .selector-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.kbuffer-convergence .sample-pills {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.kbuffer-convergence .sample-pill-btn {
    font-family: var(--kb-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 999px;
    border: 1px solid var(--border-dark);
    background: #ffffff;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.kbuffer-convergence .sample-pill-btn:hover {
    border-color: #94a3b8;
    background: #f1f5f9;
}

.kbuffer-convergence .sample-pill-btn.active {
    background: #10b981;
    color: #ffffff;
    border-color: #059669;
}

.kbuffer-convergence .plot-container {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

#kbuffer-plotSvg {
    display: block;
    width: 100%;
    height: auto;
}

.kbuffer-convergence .plot-hitbox {
    cursor: pointer;
}

.kbuffer-convergence .plot-legend {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 4px 10px;
    margin-top: 10px;
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.kbuffer-convergence .legend-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.kbuffer-convergence .legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.kbuffer-convergence .legend-val {
    font-family: var(--kb-mono);
    font-weight: 700;
    color: #0f172a;
}

.kbuffer-convergence .threeway-title {
    margin-bottom: 8px;
}

.kbuffer-convergence .current-sample {
    color: #059669;
    font-weight: 700;
}

/* Taps and sideways drags move the dividers, vertical swipes scroll the page; the handles drag in any direction */
.kbuffer-convergence .threeway-viewport {
    position: relative;
    width: 100%;
    aspect-ratio: 648 / 420;
    overflow: hidden;
    border-radius: 10px;
    background: #090d16;
    border: 1px solid var(--border-dark);
    box-shadow: 0 8px 20px -4px rgba(0, 0, 0, 0.22);
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y;
    cursor: ew-resize;
}

.kbuffer-convergence .threeway-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.kbuffer-convergence .layer-left {
    clip-path: polygon(0% 0%, 33.33% 0%, 33.33% 100%, 0% 100%);
}

.kbuffer-convergence .layer-middle {
    clip-path: polygon(33.33% 0%, 66.67% 0%, 66.67% 100%, 33.33% 100%);
}

.kbuffer-convergence .layer-right {
    clip-path: polygon(66.67% 0%, 100% 0%, 100% 100%, 66.67% 100%);
}

.kbuffer-convergence .threeway-layer img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.kbuffer-convergence .threeway-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 10px;
    margin-left: -5px;
    z-index: 30;
    cursor: ew-resize;
}

.kbuffer-convergence .divider-1 {
    left: 33.33%;
}

.kbuffer-convergence .divider-2 {
    left: 66.67%;
}

.kbuffer-convergence .divider-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2.5px;
    transform: translateX(-50%);
}

.kbuffer-convergence .divider-1 .divider-line {
    background: #2563eb;
    box-shadow: 0 0 8px rgba(37, 99, 235, 0.7);
}

.kbuffer-convergence .divider-2 .divider-line {
    background: #7c3aed;
    box-shadow: 0 0 8px rgba(124, 58, 237, 0.7);
}

.kbuffer-convergence .divider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    touch-action: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.kbuffer-convergence .divider-1 .divider-handle {
    border: 2px solid #2563eb;
    color: #2563eb;
}

.kbuffer-convergence .divider-2 .divider-handle {
    border: 2px solid #7c3aed;
    color: #7c3aed;
}

.kbuffer-convergence .threeway-divider:hover .divider-handle,
.kbuffer-convergence .threeway-divider.is-dragging .divider-handle {
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
}

.kbuffer-convergence .threeway-badge {
    position: absolute;
    top: 10px;
    z-index: 20;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px 9px;
    border-radius: 6px;
    background: rgba(15, 23, 42, 0.82);
    color: #ffffff;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.35);
    transition: opacity 0.2s ease;
}

.kbuffer-convergence .badge-left {
    left: 10px;
    border: 1.5px solid #3b82f6;
}

.kbuffer-convergence .badge-middle {
    left: 50%;
    transform: translateX(-50%);
    border: 1.5px solid #10b981;
    background: rgba(6, 78, 59, 0.85);
}

.kbuffer-convergence .badge-right {
    right: 10px;
    border: 1.5px solid #8b5cf6;
}

.kbuffer-convergence .badge-title {
    font-size: 0.76rem;
    font-weight: 700;
    white-space: nowrap;
}

.kbuffer-convergence .badge-psnr {
    font-family: var(--kb-mono);
    font-size: 0.66rem;
    color: #cbd5e1;
    white-space: nowrap;
}

.kbuffer-convergence .badge-middle .badge-psnr {
    color: #a7f3d0;
}

/* ============================================================================================================
   4-way ablation comparison
   ============================================================================================================ */

.kbuffer-ablation .scene-buttons {
    margin-bottom: 1rem;
}

/* Mouse: press and drag anywhere. Touch: drag the handle or tap; vertical swipes scroll the page */
.kbuffer-ablation .fourway-viewport {
    position: relative;
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
    aspect-ratio: 618 / 411;
    overflow: hidden;
    border-radius: 12px;
    background: #090d16;
    border: 1px solid var(--border-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y;
    cursor: crosshair;
}

.kbuffer-ablation .fourway-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.kbuffer-ablation .fourway-layer img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#kbuffer-fourwayLayerTL {
    clip-path: polygon(0 0, 50% 0, 50% 50%, 0 50%);
}

#kbuffer-fourwayLayerTR {
    clip-path: polygon(50% 0, 100% 0, 100% 50%, 50% 50%);
}

#kbuffer-fourwayLayerBL {
    clip-path: polygon(0 50%, 50% 50%, 50% 100%, 0 100%);
}

#kbuffer-fourwayLayerBR {
    clip-path: polygon(50% 50%, 100% 50%, 100% 100%, 50% 100%);
}

.kbuffer-ablation .fourway-divider-v,
.kbuffer-ablation .fourway-divider-h {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.7);
    z-index: 20;
    pointer-events: none;
}

.kbuffer-ablation .fourway-divider-v {
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    transform: translateX(-50%);
}

.kbuffer-ablation .fourway-divider-h {
    left: 0;
    right: 0;
    top: 50%;
    height: 2px;
    transform: translateY(-50%);
}

.kbuffer-ablation .fourway-handle {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #ffffff;
    border: 2.5px solid var(--viridis-teal);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
    z-index: 30;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: move;
    color: var(--viridis-teal);
    font-size: 0.9rem;
    touch-action: none;
    transition: transform 0.1s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.kbuffer-ablation .fourway-handle:hover,
.kbuffer-ablation .fourway-handle.dragging {
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.6);
    background: #f0fdfa;
}

.kbuffer-ablation .fourway-badge {
    position: absolute;
    z-index: 25;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: rgba(15, 23, 42, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 5px 8px;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.kbuffer-ablation .badge-tl {
    top: 10px;
    left: 10px;
}

.kbuffer-ablation .badge-tr {
    top: 10px;
    right: 10px;
    align-items: flex-end;
}

.kbuffer-ablation .badge-bl {
    bottom: 10px;
    left: 10px;
}

.kbuffer-ablation .badge-br {
    bottom: 10px;
    right: 10px;
    align-items: flex-end;
}

.kbuffer-ablation .badge-br.highlight-ours {
    background: rgba(6, 78, 59, 0.88);
    border-color: rgba(52, 211, 153, 0.6);
}

.kbuffer-ablation .fourway-badge-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.kbuffer-ablation .badge-tr .fourway-badge-tags,
.kbuffer-ablation .badge-br .fourway-badge-tags {
    justify-content: flex-end;
}

.kbuffer-ablation .fourway-tag {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    padding: 1px 5px;
    border-radius: 4px;
    white-space: nowrap;
}

.kbuffer-ablation .tag-v0 {
    background: rgba(148, 163, 184, 0.28);
    color: #cbd5e1;
}

.kbuffer-ablation .tag-v1 {
    background: rgba(59, 130, 246, 0.32);
    color: #93c5fd;
}

.kbuffer-ablation .tag-stoch {
    background: rgba(239, 68, 68, 0.32);
    color: #fca5a5;
}

.kbuffer-ablation .tag-kbuf {
    background: rgba(20, 184, 166, 0.32);
    color: #5eead4;
}

.kbuffer-ablation .tag-ours {
    background: #059669;
    color: #ffffff;
}

.kbuffer-ablation .fourway-badge-psnr {
    font-family: var(--kb-mono);
    font-size: 0.82rem;
    font-weight: 800;
    color: #38bdf8;
}

.kbuffer-ablation .badge-br.highlight-ours .fourway-badge-psnr {
    color: #34d399;
}

/* ============================================================================================================
   Narrower screens
   ============================================================================================================ */

/* Below the desktop breakpoint the content column gets wider again (full width), so the side-by-side layouts
   fit down to about 900px */
@media screen and (max-width: 899.98px) {
    .kbuffer-convergence .threeway-grid,
    .kbuffer-explorer .explorer-top {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media screen and (max-width: 768px) {
    .kbuffer-widget .widget-card {
        padding: 12px;
    }

    .kbuffer-toy .toy-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .kbuffer-explorer .floating-loupe {
        width: 100px;
        height: 100px;
    }

    /* Frame slider on its own line, so it stays usable */
    .kbuffer-explorer .playback-row {
        flex-wrap: wrap;
    }

    .kbuffer-explorer .frame-slider {
        order: 1;
        flex-basis: 100%;
    }

    .kbuffer-explorer .frame-badge {
        margin-left: auto;
    }

    .kbuffer-explorer .view-row .button-17,
    .kbuffer-explorer .view-row .button-17-selected {
        height: 40px;
        padding: 2px 14px;
        font-size: 15px;
    }

    /* Neighborhood panels on top of each other, so the weight badges stay readable */
    .kbuffer-explorer .neighborhood-container {
        flex-direction: column;
    }

    .kbuffer-explorer .nh-panel {
        width: 100%;
        max-width: 200px;
    }

    .kbuffer-explorer .nh-transition {
        flex-direction: row;
        gap: 8px;
    }

    .kbuffer-explorer .nh-transition svg {
        transform: rotate(90deg);
    }

    .kbuffer-explorer .nh-transition-caption br {
        display: none;
    }

    /* Computation rows stacked: label, inputs, result */
    .kbuffer-explorer .compute-row {
        flex-direction: column;
    }

    .kbuffer-explorer .row-side-label {
        width: auto;
        align-self: flex-start;
        padding: 3px 10px;
    }

    .kbuffer-explorer .row-side-label span {
        writing-mode: horizontal-tb;
        transform: none;
    }

    .kbuffer-explorer .row-side-label-spacer {
        display: none;
    }

    .kbuffer-explorer .upstream-flow {
        flex-direction: column;
    }

    .kbuffer-explorer .sample-card,
    .kbuffer-explorer .sample-eval-note {
        align-self: stretch;
        max-width: none;
    }

    .kbuffer-explorer .row-result {
        width: auto;
    }

    .kbuffer-explorer .vertical-op-row {
        justify-content: center;
    }

    /* Slots in a 2x2 grid with the operators kept: #0 × #1, then ×, then #2 × #3, then = */
    .kbuffer-explorer .slots-flow {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
        align-items: center;
        gap: 4px 6px;
    }

    .kbuffer-explorer .slots-flow > :nth-child(4),
    .kbuffer-explorer .slots-flow > :nth-child(8) {
        grid-column: 1 / -1;
        justify-self: center;
        line-height: 1;
    }

    .kbuffer-explorer .pixel-status {
        position: static;
        margin-bottom: 6px;
    }

    .kbuffer-explorer .pixel-status:empty {
        display: none;
    }

    .kbuffer-convergence .threeway-badge {
        top: 6px;
        padding: 3px 6px;
    }

    .kbuffer-convergence .badge-left {
        left: 6px;
    }

    .kbuffer-convergence .badge-right {
        right: 6px;
    }

    .kbuffer-convergence .badge-title {
        font-size: 0.66rem;
    }

    .kbuffer-convergence .badge-psnr {
        display: none;
    }

    .kbuffer-ablation .fourway-badge {
        padding: 3px 5px;
        max-width: 46%;
    }

    .kbuffer-ablation .badge-tl,
    .kbuffer-ablation .badge-tr {
        top: 6px;
    }

    .kbuffer-ablation .badge-bl,
    .kbuffer-ablation .badge-br {
        bottom: 6px;
    }

    .kbuffer-ablation .badge-tl,
    .kbuffer-ablation .badge-bl {
        left: 6px;
    }

    .kbuffer-ablation .badge-tr,
    .kbuffer-ablation .badge-br {
        right: 6px;
    }

    .kbuffer-ablation .fourway-tag {
        font-size: 0.52rem;
    }

    .kbuffer-ablation .fourway-badge-psnr {
        font-size: 0.72rem;
    }

    .kbuffer-ablation .fourway-handle {
        width: 40px;
        height: 40px;
    }
}