:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --border: #e2e2e2;
  --accent: #0078d4;
  --card: #fafafa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --fg: #ededed;
    --muted: #a0a0a0;
    --border: #303236;
    --accent: #4ca5f0;
    --card: #1f2124;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2.5rem 1.25rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.55;
}

main {
  max-width: 44rem;
  margin: 0 auto;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.lede {
  margin: 0 0 2rem;
  color: var(--muted);
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1.25rem;
  margin: 0;
}

dt {
  color: var(--muted);
  font-size: 0.875rem;
}

dd {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.875rem;
  overflow-wrap: anywhere;
}

button {
  border: 0;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

#ping-result:empty {
  display: none;
}

#ping-result {
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--muted);
}