:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --panel: #f5f5f7;
  --border: #d2d2d7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --panel: #1c1c1f;
    --border: #3a3a3d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 960px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 22px; margin: 0 0 8px; }
h2 { font-size: 16px; margin: 28px 0 8px; }
p { color: var(--muted); margin: 0 0 12px; }
form { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin: 16px 0; }
button {
  font: inherit;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }
pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.45;
  min-height: 48px;
  white-space: pre-wrap;
  word-break: break-word;
}