.fws-demo {
  --fws-stop: #c65d4b;
  --fws-signal: #347d67;
  --fws-road: #d7dbe0;
  --fws-lane: #f7f7f5;
  margin: 1.5em 0;
  color: var(--color-text);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .fws-demo {
    --fws-stop: #ef8c78;
    --fws-signal: #65b99d;
    --fws-road: #45484d;
    --fws-lane: #767a80;
  }
}

:root[data-theme="dark"] .fws-demo {
  --fws-stop: #ef8c78;
  --fws-signal: #65b99d;
  --fws-road: #45484d;
  --fws-lane: #767a80;
}

.fws-demo-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  margin-bottom: 0.9rem;
}

.fws-demo button {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.38em 0.8em;
  color: var(--color-text);
  background: var(--color-bg);
  cursor: pointer;
  font-size: 0.88em;
}

.fws-demo button[aria-pressed="true"] {
  color: var(--color-bg);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.fws-demo button:focus-visible {
  outline: 2px solid var(--color-highlight);
  outline-offset: 2px;
}

.fws-demo-panels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.fws-demo-panel {
  min-width: 0;
  text-align: center;
}

.fws-demo-panel h3 {
  margin: 0 0 0.55rem;
  color: var(--color-ink);
  font-size: 1em;
  font-weight: 600;
}

.fws-demo canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-bg-warm);
  border-radius: var(--radius-md);
}

.fws-demo-metric {
  min-height: 2.8em;
  margin: 0.55rem 0 0;
  color: var(--color-muted);
  font-size: 0.82em;
  line-height: 1.45;
}

.fws-demo-note {
  margin: 0.9rem 0 0;
  color: var(--color-muted);
  text-align: center;
  font-size: 0.78em;
  line-height: 1.5;
}

@media (max-width: 620px) {
  .fws-demo-panels {
    grid-template-columns: 1fr;
  }

  .fws-demo-panel {
    max-width: 390px;
    width: 100%;
    margin-inline: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fws-demo-note::before {
    content: "已按系统设置暂停动画。";
  }
}