@font-face {
  font-family: "Noto Sans SC";
  src:
    local("Noto Sans SC"),
    local("Noto Sans SC Regular"),
    local("NotoSansSC-Regular"),
    local("Noto Sans CJK SC"),
    local("Noto Sans CJK SC Regular"),
    local("Noto Sans SC Variable"),
    local("Source Han Sans CN"),
    local("Source Han Sans CN Regular"),
    local("SourceHanSansCN-Regular"),
    local("Source Han Sans SC"),
    local("Source Han Sans SC Regular"),
    local("SourceHanSansSC-Regular"),
    local("Source Han Sans CN VF"),
    local("Source Han Sans SC VF"),
    url("/fonts/NotoSansSC-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Noto Sans SC";
  src:
    local("Noto Sans SC Bold"),
    local("NotoSansSC-Bold"),
    local("Noto Sans CJK SC Bold"),
    local("Noto Sans SC Variable"),
    local("Source Han Sans CN Bold"),
    local("SourceHanSansCN-Bold"),
    local("Source Han Sans SC Bold"),
    local("SourceHanSansSC-Bold"),
    local("Source Han Sans CN VF"),
    local("Source Han Sans SC VF"),
    url("/fonts/NotoSansSC-Bold.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

@font-face {
  font-family: "Cascadia Code";
  src:
    local("Cascadia Code"),
    local("CascadiaCode-Regular"),
    url("/fonts/CascadiaCode-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  /* 排除 U+2018–U+201D 中文引号，使其回落给 CJK 字体获取全角字形 */
  unicode-range:
    U+0020-2017, U+201A-201B, U+201E-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Cascadia Code";
  src:
    local("Cascadia Code Bold"),
    local("CascadiaCode-Bold"),
    url("/fonts/CascadiaCode-Bold.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  unicode-range:
    U+0020-2017, U+201A-201B, U+201E-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* 优先使用系统原生 UI 字体，fallback 到 Noto Sans SC */
  --font-family-text:
    system-ui, -apple-system, BlinkMacSystemFont, Ubuntu, "PingFang SC",
    "Microsoft YaHei", "微软雅黑", "MiSans L3", "HarmonyOS Sans SC",
    "HONOR Sans CN", "MiSans", "OPPO Sans 4.0", "vivo Sans SC L3", "vivo Sans",
    "vivo Sans SC VF", "Noto Sans SC", sans-serif;

  /* 等宽字体栈：Cascadia Code → 系统等宽 → 中文字体回落 */
  --font-family-mono: "Cascadia Code", ui-monospace, var(--font-family-text);

  --code-font-family: var(--font-family-mono);
  --font-family-code: var(--font-family-mono);

  /* 组合字体：优先使用等宽字体显示数字和英文，fallback 到中文字体 */
  --font-family: var(--font-family-mono), var(--font-family-text);
}