/*
 * Japanese typography.
 *
 * The site's Latin webfonts (Instrument Sans / IBM Plex Mono) carry no kana or
 * kanji. Unlike Korean, every major platform ships a good Japanese UI face, so
 * these stacks name the platform fonts instead of downloading one. The Latin
 * webfont stays first, so product names and code keep the site's look, and the
 * Japanese families take over for Japanese glyphs.
 *
 * The rules apply only when the locale switcher sets `html[lang="ja"]`; every
 * other locale keeps its own stacks untouched.
 */

html[lang="ja"] {
    --font-sans: "Instrument Sans", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Meiryo", "Noto Sans JP", "Noto Sans CJK JP", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "BIZ UDGothic", "Osaka-Mono", "MS Gothic", "Noto Sans Mono CJK JP", monospace;
}

/* Keep closing punctuation and small kana off the start of a line. */
html[lang="ja"] body {
    line-break: strict;
}

/* Display headings are tracked tightly for Latin; kana and kanji need their natural spacing. */
html[lang="ja"] h1,
html[lang="ja"] h2 {
    letter-spacing: 0;
}