/* =============================================================================
   Settings → Performance Page
   Hand-rolled SVG plots over /api/metrics/turns. Tokyo-Night palette.
   ============================================================================= */

.performance-panel {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.performance-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-darker);
    border: 1px solid var(--border);
    border-radius: 6px;
}

.performance-control-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-right: 0.5rem;
}

.performance-window-group {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.performance-window-button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.3rem 0.75rem;
    font-size: 0.85rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.performance-window-button:hover {
    color: var(--text-primary);
    border-color: var(--accent);
}

.performance-window-button.active {
    background: var(--accent);
    color: var(--bg-darker);
    border-color: var(--accent);
}

.performance-group-by {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.performance-group-by select {
    background: var(--bg-dark);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.3rem 0.5rem;
    font-size: 0.85rem;
}

.performance-charts {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.performance-chart {
    background: var(--bg-darker);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.chart-title {
    margin: 0;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
}

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.chart-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.chart-legend-swatch {
    display: inline-block;
    width: 14px;
    height: 4px;
    border-radius: 2px;
    background: var(--accent);
}

.performance-chart-svg {
    width: 100%;
    height: auto;
    display: block;
}

.chart-empty {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 2rem;
    text-align: center;
    background: var(--bg-darker);
    border: 1px dashed var(--border);
    border-radius: 6px;
}

.chart-gridline {
    stroke: var(--border);
    stroke-width: 0.5;
    stroke-opacity: 0.55;
}

.chart-x-label,
.chart-y-label,
.chart-y-axis-title {
    fill: var(--text-secondary);
    font-size: 11px;
    font-family: 'Segoe UI', Tahoma, sans-serif;
}

.chart-y-axis-title {
    font-style: italic;
    fill: var(--text-secondary);
    opacity: 0.85;
}