:root {
  color-scheme: light;
  --paper: #eeeee8;
  --paper-deep: #e5e5de;
  --ink: #171916;
  --muted: #767a73;
  --hairline: #b9bcb5;
  --blue: #4d91c7;
  --blue-soft: #dbeaf4;
  --green: #5c9c74;
  --green-soft: #dceadf;
  --comm: #e06d3f;
  --comm-soft: #f5ddd3;
  --yellow: #d6aa38;
  --white: #fafaf7;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--paper-deep);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  font: inherit;
}

.parallel-draft {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 28px;
  background: var(--paper);
}

.dp-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.dp-kicker,
.dp-chip,
.phase-tabs button,
.mono,
svg text.mono {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.dp-kicker {
  font-size: 12px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.dp-chip {
  border: 1px solid var(--hairline);
  padding: 6px 9px;
  color: var(--muted);
  font-size: 11px;
}

.stage {
  position: relative;
  width: 100%;
}

.stage svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.phase-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
  border: 1px solid var(--hairline);
}

.phase-tabs button {
  min-height: 46px;
  border: 0;
  border-right: 1px solid var(--hairline);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.phase-tabs button:last-child {
  border-right: 0;
}

.phase-tabs button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--white);
}

.phase-tabs button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.phase-copy {
  min-height: 74px;
  padding: 15px 16px 2px;
  font-size: 14px;
  line-height: 1.55;
}

.phase-copy strong {
  font-weight: 650;
}

.phase-copy code {
  padding: 2px 5px;
  background: var(--white);
  border: 1px solid #d9d9d2;
  color: #c64048;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

.forward-only,
.backward-only {
  transition:
    opacity 220ms ease,
    visibility 220ms ease;
}

.parallel-draft[data-phase="forward"] .backward-only,
.parallel-draft[data-phase="backward"] .forward-only {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.parallel-draft[data-phase="forward"] .forward-only,
.parallel-draft[data-phase="backward"] .backward-only {
  opacity: 1;
  visibility: visible;
}

.structure {
  fill: var(--white);
  stroke: var(--ink);
  stroke-width: 1.4;
}

.structure-soft {
  fill: none;
  stroke: var(--hairline);
  stroke-width: 1.2;
}

.layer {
  fill: var(--paper);
  stroke: var(--hairline);
  stroke-width: 1;
}

.layer-accent {
  fill: var(--blue-soft);
  stroke: var(--blue);
  stroke-width: 1;
}

.label {
  fill: var(--ink);
  font-size: 13px;
}

.small-label {
  fill: var(--muted);
  font-size: 11px;
}

.tiny-label {
  fill: var(--muted);
  font-size: 9px;
  letter-spacing: 0.04em;
}

.allreduce-label {
  fill: var(--comm);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.flow {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
}

.flow-green {
  fill: none;
  stroke: var(--green);
  stroke-width: 2;
}

.local-backward {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.7;
}

.comm-line {
  fill: none;
  stroke: var(--comm);
  stroke-width: 3.5;
}

.comm-line-thin {
  fill: none;
  stroke: var(--comm);
  stroke-width: 2;
}

.data-token {
  fill: var(--blue);
}

.data-token-green {
  fill: var(--green);
}

.grad-token {
  fill: var(--comm);
}

.avg-token {
  fill: var(--yellow);
  stroke: var(--ink);
  stroke-width: 0.7;
}

.comm-fill {
  fill: var(--comm-soft);
  stroke: var(--comm);
  stroke-width: 1.4;
}

.gpu-fill {
  fill: #e2eee4;
  stroke: var(--ink);
  stroke-width: 1.4;
}

.loss-fill {
  fill: var(--blue-soft);
  stroke: var(--blue);
  stroke-width: 1.2;
}

.pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: pulse 1.3s ease-in-out infinite;
}

.spin {
  transform-box: fill-box;
  transform-origin: center;
  animation: spin 4s linear infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.45;
    transform: scale(0.84);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pulse,
  .spin {
    animation: none;
  }

  .forward-only,
  .backward-only {
    transition: none;
  }
}

@media (max-width: 560px) {
  .parallel-draft {
    padding: 16px;
  }

  .dp-head {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 4px;
  }

  .phase-copy {
    font-size: 13px;
  }
}