:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fafafa;
  --muted: #555;
  --border: #ddd;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --bg: #111;
    --muted: #aaa;
    --border: #333;
    --accent: #60a5fa;
  }
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 1200px;
  margin: 2em auto;
  padding: 0 1em;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

header h1 {
  font-size: 1.4em;
  margin-bottom: 0.2em;
}

.subtitle {
  color: var(--muted);
  margin-top: 0;
}

.nodes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5em;
  margin: 2em 0;
}

@media (max-width: 720px) {
  .nodes { grid-template-columns: 1fr; }
}

.node {
  padding: 1em;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg) 92%, var(--fg) 8%);
}

.node h2 {
  margin-top: 0;
  font-size: 1.15em;
}

.metrics .loading { color: var(--muted); font-style: italic; }

.metrics .row {
  display: flex;
  justify-content: space-between;
  padding: 0.25em 0;
  border-bottom: 1px dashed var(--border);
}

.metrics .row:last-child { border-bottom: none; }

.metrics .label { color: var(--muted); }

.metrics .value { font-variant-numeric: tabular-nums; }

.chart {
  display: block;
  width: 100%;
  height: 180px;
  margin-top: 1em;
}

.meta {
  color: var(--muted);
  font-size: 0.9em;
  margin: 2em 0;
}

.footer-nav a {
  color: var(--accent);
  text-decoration: none;
  margin-right: 1em;
}

.footer-nav a:hover { text-decoration: underline; }