/* css/fonts.css —— 缝合像素字体（Fusion Pixel Font，SIL OFL 1.1）
   仅用 12px：比例模式作正文，等宽模式作数字。
   字体文件在 assets/fonts/fusion-pixel/，许可证见同目录 OFL.txt。

   说明：
   - 像素字体按「语言特定字形」拆分（latin / zh_hans / zh_hant / zh_hk / zh_tw / ja / ko），
     每个文件都已内含拉丁字母 + 该语言字形，因此按当前语言切换整个字体族即可。
   - @font-face 是惰性加载：浏览器只会在文本实际用到时下载对应字体，
     所以声明全部语言不会拖慢首屏（仅当前语言的 2 个 woff2 被下载）。 */

/* ---- 12px 比例模式（正文） ---- */
@font-face {
  font-family: "Fusion Pixel 12 latin";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-latin.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 zh-hans";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-zh_hans.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 zh-hant";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-zh_hant.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 zh-hk";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-zh_hk.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 zh-tw";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-zh_tw.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 ja";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-ja.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 ko";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-proportional-ko.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---- 12px 等宽模式（数字） ---- */
@font-face {
  font-family: "Fusion Pixel 12 Mono latin";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-latin.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono zh-hans";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-zh_hans.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono zh-hant";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-zh_hant.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono zh-hk";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-zh_hk.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono zh-tw";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-zh_tw.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono ja";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-ja.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fusion Pixel 12 Mono ko";
  src: url("../assets/fonts/fusion-pixel/fusion-pixel-12px-monospaced-ko.otf.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---- SevenFifteen（CC BY 4.0，Douglas Vautour / Burpy Fresh）：备用像素字体，
   覆盖 Fusion 缺失的阿拉伯（含连写）/ 天城文（含连字）/ 希腊 / 西里尔 / 希伯来 / 泰文 等。
   字体选择采用优先级而非按语言决定：Fusion > SevenFifteen；浏览器按字形回退。 */
@font-face {
  font-family: "SevenFifteen";
  src: url("../assets/fonts/seven-fifteen/SevenFifteenMonoRounded-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---- 像素字体渲染：保持锐利（关闭抗锯齿与合成粗体/斜体） ---- */
body {
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeSpeed;
  font-synthesis: none;
}

/* ---- 按语言切换字体族（默认简体中文） ---- */
:root {
  --font: "Fusion Pixel 12 zh-hans", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: "Fusion Pixel 12 Mono zh-hans", "Fusion Pixel 12 zh-hans", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="zh-Hant"] {
  --font: "Fusion Pixel 12 zh-hant", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: "Fusion Pixel 12 Mono zh-hant", "Fusion Pixel 12 zh-hant", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="zh-TW"] {
  --font: "Fusion Pixel 12 zh-tw", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: "Fusion Pixel 12 Mono zh-tw", "Fusion Pixel 12 zh-tw", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="zh-HK"] {
  --font: "Fusion Pixel 12 zh-hk", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: "Fusion Pixel 12 Mono zh-hk", "Fusion Pixel 12 zh-hk", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="ja"] {
  --font: "Fusion Pixel 12 ja", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --mono: "Fusion Pixel 12 Mono ja", "Fusion Pixel 12 ja", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="ko"] {
  --font: "Fusion Pixel 12 ko", "SevenFifteen", system-ui, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  --mono: "Fusion Pixel 12 Mono ko", "Fusion Pixel 12 ko", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}
:root[data-lang="en"] {
  --font: "Fusion Pixel 12 latin", "SevenFifteen", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Fusion Pixel 12 Mono latin", "Fusion Pixel 12 latin", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* 法语（拉丁文；Fusion latin 覆盖）。若后续加入西/葡等含变音的语言，同样走 latin。 */
:root[data-lang="fr"] {
  --font: "Fusion Pixel 12 latin", "SevenFifteen", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Fusion Pixel 12 Mono latin", "Fusion Pixel 12 latin", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* 西班牙语 / 葡萄牙语（拉丁文，同 fr）。 */
:root[data-lang="es"],
:root[data-lang="pt"] {
  --font: "Fusion Pixel 12 latin", "SevenFifteen", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Fusion Pixel 12 Mono latin", "Fusion Pixel 12 latin", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* 印地语（天城文）：Fusion 无字形，优先回退 SevenFifteen（含连字）。 */
:root[data-lang="hi"] {
  --font: "Fusion Pixel 12 latin", "SevenFifteen", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Fusion Pixel 12 Mono latin", "Fusion Pixel 12 latin", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* 阿拉伯语（RTL）：Fusion 无阿拉伯字形，按字形回退到 SevenFifteen（含连写）。
   拉丁数字仍走 Fusion，保持与其它语言一致，且应保持拉丁数字而非阿拉伯-印度数字。 */
:root[data-lang="ar"] {
  --font: "Fusion Pixel 12 latin", "SevenFifteen", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Fusion Pixel 12 Mono latin", "Fusion Pixel 12 latin", "SevenFifteen", ui-monospace, "Cascadia Code", Consolas, monospace;
}