/* Interactive performance chart (mlx-serve vs LM Studio, per-model pills).
   Shared by index.html and speculative-decoding/. Data lives in
   perf-chart.js; numbers come from docs/perf-csvs/{gemma,qwen36}-26.7.6.csv.
   Requires the site's CSS vars (--white/--radius/--shadow-elevated/--ink/
   --green/--mono/--border/--blue/--text-*), defined in both index.html's
   inline styles and assets/feature.css. */

/* ─── CHART ─── */
.chart-card {
  max-width: 980px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-elevated);
  padding: 28px 28px 24px;
}

.chart-pills { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 22px; }

.chart-pill {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.chart-pill:hover { border-color: var(--blue); color: var(--blue); }

.chart-pill.active {
  background: var(--text-primary);
  color: var(--white);
  border-color: var(--text-primary);
}

.chart-canvas-wrap { position: relative; width: 100%; height: 380px; }
#perfChart { width: 100%; height: 100%; display: block; }

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--ink);
  color: var(--white);
  border-radius: 9px;
  padding: 9px 12px;
  font-size: 12px;
  line-height: 1.45;
  opacity: 0;
  transform: translate(-50%, -118%);
  transition: opacity 0.12s ease;
  white-space: nowrap;
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  z-index: 5;
}

.chart-tooltip .tt-series { font-family: var(--mono); font-weight: 600; }
.chart-tooltip .tt-val { color: #9fe6ff; font-family: var(--mono); }
.chart-tooltip .tt-delta { color: var(--green); font-family: var(--mono); }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
  margin-top: 18px;
}

.legend-item { display: flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-secondary); }
.legend-swatch { width: 13px; height: 13px; border-radius: 4px; flex-shrink: 0; }

.chart-caption {
  max-width: 760px;
  margin: 22px auto 0;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

.chart-caption b { color: var(--text-secondary); font-weight: 600; }

/* Responsive (mirrors the host pages' breakpoints) */
@media (max-width: 720px) {
  .chart-canvas-wrap { height: 320px; }
  .chart-card { padding: 20px 14px 18px; }
}
@media (max-width: 480px) {
  .chart-canvas-wrap { height: 300px; }
}