/* 默认（拉丁语系：en/fr/de/es/pt/it/nl/tr/vi/id/pl/uk 等） */
html {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
               Arial, "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* 简体中文 */
:lang(zh), :lang(zh-CN) {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei",
               "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* 繁體中文 */
:lang(zh-TW) {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang TC",
               "Heiti TC", "Microsoft JhengHei", "Noto Sans TC",
               "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* 日本語 */
:lang(ja) {
  font-family: system-ui, -apple-system, "Segoe UI",
               "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo,
               "Yu Gothic UI", "Yu Gothic",
               "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* 한국어 */
:lang(ko) {
  font-family: system-ui, -apple-system, "Segoe UI",
               "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans KR",
               "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* हिन्दी（天城文） */
:lang(hi) {
  font-family: "Noto Sans Devanagari", system-ui, -apple-system, "Segoe UI",
               Roboto, Arial, "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* ไทย */
:lang(th) {
  font-family: "Noto Sans Thai", system-ui, -apple-system, "Segoe UI",
               Roboto, Arial, "Noto Color Emoji", "Apple Color Emoji", "Segoe UI Emoji",
               sans-serif;
}

/* 可选：计时器/进度数字等宽 */
#timer, .save-progress { font-variant-numeric: tabular-nums; }