/* ─── Pretraining LDS interactive chart ─────────────────────── */
.pretrain-chart-card {
    max-width: 980px;
    margin: 12px auto 0 auto;
    padding: 22px 22px 16px 22px;
    background: rgba(255,255,255,0.025);
    border: 1px solid var(--border-color);
    border-radius: 14px;
}
:root.light .pretrain-chart-card { background: rgba(0,0,0,0.025); }

.pretrain-chart-blurb {
    margin: 0 0 16px 0;
    font-size: 0.95em;
    line-height: 1.55;
    color: var(--text-color);
    text-align: left;
    max-width: none;
}

.pretrain-grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    grid-template-rows: 1fr 1fr;
    gap: 18px 22px;
    align-items: stretch;
}
.pretrain-plot {
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.pretrain-plot-lds    { grid-row: 1 / span 2; grid-column: 1; }
.pretrain-plot-runtime{ grid-row: 1; grid-column: 2; }
.pretrain-plot-gpu    { grid-row: 2; grid-column: 2; }

.pretrain-plot-title {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-color);
    margin: 0 0 6px 0;
    text-align: center;
}
.pretrain-plot-subtitle {
    font-weight: 400;
    color: var(--subtle-text-color);
    font-size: 0.92em;
}
.pretrain-plot svg {
    display: block;
    width: 100%;
    height: auto;
    overflow: visible;
    flex: 1 1 auto;
    min-height: 0;
}

.pretrain-axis-line { stroke: var(--border-color); stroke-width: 1; }
.pretrain-grid-line { stroke: var(--border-color); stroke-width: 1; stroke-dasharray: 2 4; opacity: 0.45; }
.pretrain-axis-label,
.pretrain-tick-label {
    fill: var(--subtle-text-color);
    font-family: 'Google Sans', sans-serif;
}
.pretrain-tick-label { font-size: 13px; }
.pretrain-axis-label { font-size: 14px; font-weight: 500; }
.pretrain-axis-label.x { text-anchor: middle; }
.pretrain-axis-label.y { text-anchor: middle; }

.pretrain-series-line {
    fill: none;
    stroke-width: 2.2;
    opacity: 0.55;
    transition: opacity 0.2s, stroke-width 0.2s;
}
.pretrain-series-line.dashed { stroke-dasharray: 5 5; opacity: 0.35; }

.pretrain-series-bubble {
    stroke: rgba(255,255,255,0.85);
    stroke-width: 1.5;
    cursor: pointer;
    transition: stroke-width 0.15s, filter 0.15s, opacity 0.2s;
    fill-opacity: 0.78;
}
:root.light .pretrain-series-bubble { stroke: rgba(0,0,0,0.35); }
.pretrain-series-bubble:hover {
    stroke-width: 2.4;
    filter: drop-shadow(0 0 8px currentColor);
}
.pretrain-series-bubble.ours {
    stroke: #ffffff;
    stroke-width: 2.2;
    fill-opacity: 0.95;
}
:root.light .pretrain-series-bubble.ours { stroke: #000; }
.pretrain-series-bubble.estimated {
    stroke-dasharray: 4 3;
    fill-opacity: 0.55;
}

.pretrain-bubble-blast {
    font-size: 14px;
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: middle;
}

.pretrain-series.hidden .pretrain-series-line,
.pretrain-series.hidden .pretrain-series-bubble,
.pretrain-series.hidden .pretrain-bubble-blast { opacity: 0.08; pointer-events: none; }

.pretrain-series.dimmed .pretrain-series-line,
.pretrain-series.dimmed .pretrain-series-bubble { opacity: 0.18; }

.pretrain-series.highlight .pretrain-series-line { stroke-width: 3.2; opacity: 0.95; }
.pretrain-series.highlight .pretrain-series-bubble { stroke-width: 2.6; fill-opacity: 1; }

.pretrain-tooltip {
    position: absolute;
    pointer-events: none;
    background: #1a1a1a;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 0.85em;
    line-height: 1.45;
    box-shadow: 0 8px 26px rgba(0,0,0,0.6);
    min-width: 200px;
    max-width: 280px;
    opacity: 0;
    transform: translate(-50%, -100%) translateY(-10px);
    transition: opacity 0.12s;
    z-index: 30;
    white-space: normal;
}
:root.light .pretrain-tooltip {
    background: #fff;
    box-shadow: 0 8px 22px rgba(0,0,0,0.15);
}
.pretrain-tooltip.show { opacity: 1; }
.pretrain-tooltip .ptt-method {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}
.pretrain-tooltip .ptt-swatch {
    width: 10px; height: 10px; border-radius: 50%;
    flex-shrink: 0;
}
.pretrain-tooltip .ptt-row {
    display: flex; justify-content: space-between; gap: 12px;
    color: var(--subtle-text-color);
    font-size: 0.92em;
}
.pretrain-tooltip .ptt-row b { color: var(--text-color); font-weight: 500; }
.pretrain-tooltip .ptt-lds b { color: var(--text-color); font-weight: 600; }
.pretrain-tooltip .ptt-tag {
    display: inline-block;
    margin-top: 6px;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.78em;
    font-weight: 600;
}
.pretrain-tooltip .ptt-tag.ours { background: rgba(79,195,247,0.18); color: var(--accent-blue); }
.pretrain-tooltip .ptt-tag.infeasible { background: rgba(255,160,80,0.18); color: #ffa050; }

.pretrain-legend {
    list-style: none;
    margin: 14px 0 8px 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.pretrain-legend li {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.82em;
    cursor: pointer;
    user-select: none;
    transition: opacity 0.18s, border-color 0.18s, background 0.18s;
}
:root.light .pretrain-legend li { background: rgba(0,0,0,0.04); }
.pretrain-legend li:hover { border-color: rgba(79,195,247,0.5); }
.pretrain-legend li.hidden { opacity: 0.35; text-decoration: line-through; }
.pretrain-legend li.ours {
    border-color: rgba(79,195,247,0.45);
    background: rgba(79,195,247,0.08);
    font-weight: 600;
}
.pretrain-legend li.info {
    cursor: default;
    border-style: dashed;
    color: var(--subtle-text-color);
}
.pretrain-legend li.info:hover { border-color: var(--border-color); }
.pretrain-legend li.info .boom {
    font-size: 1.05em;
    line-height: 1;
}
.pretrain-legend .swatch {
    width: 12px; height: 12px; border-radius: 50%;
    flex-shrink: 0;
}
.pretrain-chart-footer {
    margin: 6px 0 0 0;
    text-align: center;
    font-size: 0.82em;
    color: var(--subtle-text-color);
    font-style: italic;
}

@media (max-width: 768px) {
    .pretrain-chart-card { padding: 14px 12px 12px 12px; }
    .pretrain-chart-blurb { font-size: 0.88em; }
    .pretrain-tooltip { font-size: 0.78em; min-width: 170px; max-width: 220px; }
    .pretrain-legend li { font-size: 0.75em; padding: 4px 9px; }
    .pretrain-tick-label { font-size: 11px; }
    .pretrain-axis-label { font-size: 12px; }

    .pretrain-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 14px;
    }
    .pretrain-plot-lds    { grid-row: 1; grid-column: 1; }
    .pretrain-plot-runtime{ grid-row: 2; grid-column: 1; }
    .pretrain-plot-gpu    { grid-row: 3; grid-column: 1; }
}