/* System UI fonts — no remote font download (CJK/Cyrillic via OS stacks). */
:root {
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
        "Cascadia Mono", "Liberation Mono", monospace;
}