:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
html, body, .font-sans, button, input, select, textarea { font-family: var(--font-sans); }
.font-mono, code, pre, kbd { font-family: var(--font-mono); }