:root {
  --text: #1f2328;
  --muted: #59636e;
  --background: #ffffff;
  --accent: #0969da;
  font-family: system-ui, sans-serif;
  color: var(--text);
  background: var(--background);
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6edf3;
    --muted: #9198a1;
    --background: #0d1117;
    --accent: #4493f8;
  }
}

body {
  margin: 0;
  background: var(--background);
}

main {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1rem;
}

a {
  color: var(--accent);
}

/* Controls sit side by side on wide screens and stack on a phone. */
#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

#controls label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1 1 12rem;
}

select,
input {
  font: inherit;
  min-height: 2.5rem;
}

figure {
  margin: 1.5rem 0 0;
}

#chart svg {
  max-width: 100%;
  height: auto;
}

figcaption,
#status {
  color: var(--muted);
}