/* SVG figures for the WPK article: responsive, drawn with the site palette. */
.essay-figure .ef-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 1.5rem;
  overflow: visible;
}
.essay-figure .ef-svg text { font-family: var(--sans); fill: var(--ink); }
.essay-figure .ef-svg .ef-svg-muted { fill: var(--muted); }
.essay-figure .ef-svg .ef-svg-mono { font-family: var(--mono); letter-spacing: .04em; }
.essay-figure .ef-svg .ef-svg-axis { stroke: var(--line); stroke-width: 1; }
.essay-figure .ef-svg .ef-svg-grid { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 4; }
.essay-figure .ef-svg .ef-svg-deadline { stroke: #b23a3a; stroke-width: 1.5; stroke-dasharray: 6 4; }
.essay-figure .ef-svg .ef-svg-deadline-text { fill: #b23a3a; }
.essay-figure .ef-svg .ef-svg-wpk { fill: var(--blue); }
.essay-figure .ef-svg .ef-svg-wpk-line { stroke: var(--blue); stroke-width: 2; fill: none; }
.essay-figure .ef-svg .ef-svg-wpk-model { stroke: var(--blue); stroke-width: 2; stroke-dasharray: 7 5; fill: none; }
.essay-figure .ef-svg .ef-svg-nim { fill: var(--ink); }
.essay-figure .ef-svg .ef-svg-nim-line { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 2 4; fill: none; }
.essay-figure .ef-svg .ef-svg-busy { fill: var(--blue); }
.essay-figure .ef-svg .ef-svg-idle { fill: #e4e4ec; }
.essay-figure .ef-svg .ef-svg-barrier { fill: var(--blue-light); }
.essay-figure .ef-svg .ef-svg-box { fill: var(--blue-surface); stroke: var(--blue-border); stroke-width: 1; }
.essay-figure .ef-svg .ef-svg-box-hand { fill: #fff6d6; stroke: #e2cf86; stroke-width: 1; }
.essay-figure .ef-svg .ef-svg-box-runtime { fill: #eef7f0; stroke: #b9d8c1; stroke-width: 1; }
.essay-figure .ef-svg .ef-svg-arrow { stroke: var(--muted); stroke-width: 1.2; fill: none; }
.essay-figure .ef-svg .ef-svg-on-blue { fill: #ffffff; }
.essay-figure .ef-legend {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.6rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  font-size: .85rem;
  color: var(--muted);
}
.essay-figure .ef-legend li { display: inline-flex; align-items: center; gap: .5rem; }
.essay-figure .ef-legend i { display: inline-block; width: 14px; height: 14px; border-radius: 3px; }
.essay-figure .ef-note { margin-top: 1rem; font-size: .85rem; color: var(--muted); }
@media (max-width: 720px) {
  .essay-figure .ef-svg text { font-size: 14px; }
}

/* Six SMs per row make the shared timeline readable; narrow screens can pan. */
.essay-figure[id] { scroll-margin-top: 6rem; }
.essay-figure:target { outline: 1px solid var(--blue-border); outline-offset: .75rem; }
.essay-figure .wpk-chart-scroll {
  margin-top: 1.5rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-color: var(--blue-border) transparent;
  scrollbar-width: thin;
}
.essay-figure .wpk-chart-scroll:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; }
.essay-figure .wpk-chart-image { display: block; width: 100%; min-width: 680px; height: auto; }
.essay-figure .wpk-activity-key { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; font-size: .9rem; }
.essay-figure .wpk-scale { display: flex; align-items: center; gap: .7rem; color: var(--muted); }
.essay-figure .wpk-scale i { width: clamp(90px, 12vw, 180px); height: 12px; border-radius: 2px; background: linear-gradient(90deg, #e4e5e9, #3150bc); }
.article-body .essay-figure p.ef-note { margin-top: 1rem; }
.essay-figure .wpk-floor-details { margin-top: 1.5rem; border-top: 1px solid var(--line); padding-top: 1rem; font-size: 1rem; }
.essay-figure .wpk-floor-details summary { cursor: pointer; color: var(--blue); font-weight: 500; padding: .3rem 0; }
.essay-figure .wpk-floor-details summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.article-body .essay-figure .wpk-floor-details p { margin-top: 1rem; }
.essay-figure .wpk-formula { margin: 1.6rem 0; border-block: 1px solid var(--line); color: var(--ink); }
.essay-figure .wpk-equation { padding: 1.25rem .5rem; overflow-x: auto; }
.essay-figure .wpk-equation + .wpk-equation { border-top: 1px solid var(--line); }
.essay-figure .wpk-equation > span { display: block; margin-bottom: .8rem; color: var(--muted); font: .875rem/1.4 var(--sans); }
.essay-figure .wpk-equation math { font-family: 'STIX Two Math', 'Cambria Math', 'Latin Modern Math', math; font-size: 1.6rem; margin: .25rem auto .65rem; }
.article-body .essay-figure p.wpk-math-key { font-size: .9375rem; color: var(--muted); }
.essay-figure .wpk-math-key i { font-family: 'STIX Two Math', 'Cambria Math', Georgia, serif; font-size: 1.15em; }
.essay-figure .wpk-trace-stats { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem 1.5rem; border-block: 1px solid var(--line); margin: .5rem 0 1.2rem; padding: 1rem 0; font-size: .9375rem; color: var(--muted); }
.essay-figure .wpk-trace-stats strong { color: var(--blue); font-size: 1.2rem; font-variant-numeric: tabular-nums; margin-right: .3rem; }
.essay-figure .wpk-profile-comparison { margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.essay-figure .wpk-profile-comparison summary { cursor: pointer; color: var(--blue); font-size: 1rem; font-weight: 500; padding: .3rem 0; }
.essay-figure .wpk-profile-comparison summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.essay-figure.wpk-figure-5 .wpk-chart-image,
.essay-figure.wpk-figure-3 .wpk-chart-image { min-width: 760px; }
.essay-figure .wpk-floor-values { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 1.5rem 0; border: 1px solid var(--line); }
.essay-figure .wpk-floor-values > div { padding: 1rem; }
.essay-figure .wpk-floor-values > div + div { border-left: 1px solid var(--line); }
.essay-figure .wpk-floor-values > div:last-child { background: var(--blue-surface); color: var(--blue); }
.essay-figure .wpk-floor-values dt { font-size: .875rem; }
.essay-figure .wpk-floor-values dd { margin: .5rem 0 0; font-size: 1.8rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.essay-figure .wpk-floor-values small { font-size: .875rem; }

@media (max-width: 800px) {
  .essay-figure .wpk-activity-key { align-items: flex-start; flex-direction: column; gap: .65rem; }
  .essay-figure .wpk-floor-values { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .essay-figure .wpk-floor-values > div:nth-child(3) { border-left: 0; }
  .essay-figure .wpk-floor-values > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .essay-figure .wpk-equation math { font-size: 1.3rem; }
  .essay-figure .wpk-trace-stats { flex-direction: column; }
}
@media print {
  .essay-figure .wpk-chart-scroll { overflow: visible; }
  .essay-figure .wpk-chart-image, .essay-figure.wpk-figure-5 .wpk-chart-image,
  .essay-figure.wpk-figure-3 .wpk-chart-image { min-width: 0; }
}

/* CPU API calls and GPU worker waits are defined separately. */
.essay-figure .wpk-wait-terms { margin: 1rem 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.4rem 2rem; }
.essay-figure .wpk-wait-terms dt { margin-bottom: .4rem; color: var(--ink); font-weight: 600; font-size: .9375rem; }
.essay-figure .wpk-wait-terms dd { margin: 0; color: var(--muted); font-size: .9375rem; }
@media (max-width: 720px) { .essay-figure .wpk-wait-terms { grid-template-columns: 1fr; } }

/* Figure 02: representative SM grids and aligned CPU / HBM timelines. */
.essay-figure .wpk-execution-key {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .65rem 1.25rem;
  margin-top: 1.3rem;
  color: var(--muted);
  font-size: .8125rem;
}
.essay-figure .wpk-execution-key > span { display: inline-flex; align-items: center; gap: .5rem; }
.essay-figure .wpk-execution-scale i { width: 56px; height: 12px; background: linear-gradient(90deg, #e7e9ee, #3150bc); border-radius: 2px; }
.essay-figure .wpk-execution-cpu i { width: 14px; height: 12px; background: #a18c7b; border-radius: 2px; }
.essay-figure .wpk-execution-hbm i { width: 14px; height: 12px; background: #597f7a; border-radius: 2px; }
.essay-figure .wpk-execution-schematic { margin-left: auto; font-size: .75rem; }
.essay-figure .wpk-execution-comparison { margin-top: 1.8rem; }
.essay-figure .wpk-execution-panel { padding: 1.6rem 0 0; border-top: 1px solid var(--line); }
.essay-figure .wpk-execution-panel + .wpk-execution-panel { margin-top: .9rem; }
.essay-figure .wpk-execution-panel-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.4rem; }
.essay-figure .wpk-execution-name h4 { margin: 0; font: 600 clamp(1.125rem, 2vw, 1.6rem)/1.2 var(--sans); letter-spacing: -.035em; color: var(--ink); }
.essay-figure .wpk-execution-panel picture, .essay-figure .wpk-timeline-image { display: block; width: 100%; height: auto; }
.essay-figure .wpk-execution-caption { margin-top: .4rem; padding-top: 1.1rem; border-top: 1px solid var(--line); font-size: .875rem; line-height: 1.65; color: var(--muted); }
@media (max-width: 720px) {
  .essay-figure .wpk-execution-key { gap: .6rem 1rem; }
  .essay-figure .wpk-execution-schematic { flex-basis: 100%; margin-left: 0; }
  .essay-figure .wpk-execution-panel-header { flex-wrap: wrap; gap: 1.15rem; }
  .essay-figure .wpk-execution-name { width: 100%; }
  .essay-figure .wpk-execution-name h4 { font-size: 1.35rem; }
}
@media print {
  .essay-figure .wpk-execution-panel { break-inside: avoid; }
}

/* Small percentile inset alongside the discussion of tail latency. */
.article-body .wpk-latency-inset { margin: 1.8rem auto 2.2rem; padding: 1.3rem 1.5rem 1.1rem; border: 1px solid var(--line); border-radius: 6px; max-width: 900px; scroll-margin-top: 6rem; }
.wpk-latency-inset header { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; }
.article-body .wpk-latency-inset h3 { margin: 0; font: 600 1.25rem/1.3 var(--sans); letter-spacing: -.025em; }
.wpk-latency-inset header > span { color: var(--muted); font-size: .875rem; }
.wpk-latency-inset header strong { color: #3150bc; font-weight: 500; }
.wpk-latency-inset picture, .wpk-latency-inset img { display: block; width: 100%; height: auto; }
.wpk-latency-inset picture { margin-top: .9rem; }
.wpk-latency-inset figcaption { color: var(--muted); font-size: .8125rem; line-height: 1.5; }
@media (max-width: 720px) { .article-body .wpk-latency-inset { padding: 1rem .8rem; } }

/* Figure 01: one compact key per system, responsive plot, quiet limit keys. */
.essay-figure.wpk-figure-1 .wpk-capacity-legend { margin: 1.1rem 0 0; gap: .5rem 1.7rem; font-size: .8125rem; }
.essay-figure.wpk-figure-1 .wpk-capacity-legend i { width: 10px; height: 10px; border-radius: 0; }
.wpk-capacity-chart { display: block; margin-top: 1rem; }
.wpk-capacity-chart img { display: block; width: 100%; height: auto; }
.wpk-capacity-limits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .65rem 1rem; border-top: 1px solid var(--line); padding-top: 1rem; color: var(--muted); font-size: .75rem; line-height: 1.5; }
.wpk-capacity-limits > span { display: flex; align-items: center; gap: .5rem; }
.wpk-capacity-limits i { display: block; flex: 0 0 13px; width: 13px; height: 13px; border-radius: 2px; }
.wpk-capacity-limits .wpk-limit-physical { background: repeating-linear-gradient(135deg, #eff0f4 0 3px, #cdd2dd 3px 4px); }
.wpk-capacity-limits .wpk-limit-deadline { background: #f8eaea; border-top: 2px solid #b65a5a; }
.wpk-capacity-limits .wpk-limit-memory { background: #ececf0; border-left: 1px dashed #9298a6; }
.article-body .essay-figure p.wpk-capacity-summary { margin-top: .75rem; font-size: .75rem; }
.essay-figure.wpk-figure-1 .wpk-floor-details { margin-top: 1rem; padding-top: .7rem; }
.essay-figure.wpk-figure-1 .wpk-floor-details summary { font-size: .875rem; }
@media (max-width: 720px) {
  .wpk-capacity-limits { grid-template-columns: 1fr; gap: .4rem; font-size: .75rem; }
  .essay-figure.wpk-figure-1 .wpk-capacity-legend { gap: .6rem 1rem; }
}

.article-body .essay-figure .wpk-capacity-legend li { margin: 0; padding: 0; }

/* System headings sit above the quieter CPU / GPU / HBM lane labels. */
.article-body .essay-figure .wpk-execution-name h4 { margin: 0; font: 600 clamp(1.5rem, 2.2vw, 1.9rem)/1.2 var(--sans); letter-spacing: -.035em; color: var(--ink); }
.article-body .essay-figure [data-system="wpk"] .wpk-execution-name h4 { color: #3150bc; }
.article-body .wpk-experiment-notes { margin: 3rem 0; border-block: 1px solid var(--line); scroll-margin-top: 7rem; }
.wpk-experiment-notes > summary { cursor: pointer; padding: 1.3rem 0; color: var(--blue); font: 500 1.125rem/1.5 var(--sans); }
.wpk-experiment-notes > summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.wpk-experiment-content { padding: 0 0 1.5rem; }
.article-body .wpk-experiment-content h3 { margin: 1.5rem 0 1rem; font: 600 1.2rem/1.4 var(--sans); }