css/charts.css

.heatmap-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    flex: 1 1 auto;
    min-height: 0;
    align-items: stretch;
}

.heatmap-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: 20px;
    border: 1px solid rgba(23, 33, 29, 0.08);
    background: var(--panel-strong);
    min-height: 0;
}

.heatmap-header {
    padding: 14px 16px;
    font-weight: 700;
    border-bottom: 1px solid rgba(23, 33, 29, 0.08);
}

.plot-surface {
    width: 100%;
    min-height: 360px;
}

.plot-surface-hero {
    min-height: clamp(230px, 33vh, 380px);
    flex: 1 1 auto;
}

.plot-surface-tall {
    min-height: clamp(104px, 13vh, 154px);
}

.plot-surface-wide {
    min-height: clamp(168px, 22vh, 250px);
    height: 100%;
}

.chart-wrap {
    position: relative;
    min-height: 0;
    padding: 2px 0 0;
    flex: 1 1 auto;
    display: flex;
}

#loss-chart {
    width: 100%;
    height: 100%;
    min-height: 0;
    border-radius: 18px;
    border: 1px solid rgba(23, 33, 29, 0.08);
    background:
        linear-gradient(180deg, rgba(13, 143, 113, 0.05), rgba(13, 143, 113, 0)),
        white;
}

.chart-empty {
    position: absolute;
    inset: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    text-align: center;
    border: 1px dashed rgba(23, 33, 29, 0.18);
    border-radius: 18px;
    background: rgba(255, 252, 245, 0.85);
    color: var(--muted);
    font-weight: 500;
    z-index: 2;
}

.chart-empty[hidden] {
    display: none !important;
}

.error-column-card {
    display: flex;
    flex-direction: column;
}

.error-column {
    display: grid;
    grid-template-rows: repeat(2, minmax(0, 1fr));
    gap: 14px;
    padding: 14px;
    flex: 1 1 auto;
    min-height: 0;
}

.error-panel {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    overflow: hidden;
    border-radius: 16px;
    border: 1px solid rgba(23, 33, 29, 0.08);
    background: rgba(255, 255, 255, 0.55);
}

.error-panel-title {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 10px;
    font-size: 0.82rem;
    font-weight: 700;
    text-align: center;
    color: var(--muted);
    border-right: 1px solid rgba(23, 33, 29, 0.08);
    background: rgba(255, 252, 245, 0.72);
}

.content-pane>.canvas-card:first-child {
    flex: 1 1 56%;
    display: flex;
    flex-direction: column;
}

.content-pane>.canvas-card:last-child {
    flex: 1 1 44%;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

@media (max-width: 1500px) {
    .heatmap-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .error-column-card {
        grid-column: 1 / -1;
    }
}

@media (max-width: 1200px) {
    .timeline-title-row {
        flex-wrap: wrap;
    }

    .timeline-slider-inline {
        flex: 1 1 220px;
        min-width: 180px;
        max-width: 320px;
    }
}

@media (max-width: 1100px) {
    body {
        height: auto;
        overflow: auto;
    }

    .page-shell {
        grid-template-columns: 1fr;
        height: auto;
    }

    .heatmap-grid {
        grid-template-columns: 1fr;
    }

    .control-rail,
    .content-pane {
        overflow: visible;
    }

    .analysis-modal {
        padding: 14px;
    }

    .analysis-modal-dialog {
        width: min(100%, calc(100vw - 28px));
        max-height: calc(100vh - 28px);
    }

    .analysis-modal-content {
        padding: 22px 18px 22px;
        max-height: calc(100vh - 28px);
    }

    .analysis-hint {
        right: auto;
        left: -12px;
    }

    .analysis-hint::before {
        right: auto;
        left: 18px;
    }
}