/* 品牌字体，自己托管（不再从 Google Fonts 加载：大陆用户访问不了谷歌，<head> 里的谷歌样式表还会挡住首屏）。
   修改人：JP 修改时间：2026-10-09
   - 只带拉丁字母部分：latin、latin-ext（如 ₹ 等符号）、vietnamese（收银台有越南文）。每个 @font-face 都写了 unicode-range，浏览器只下载页面用得到的子集。
   - 中文（简体、繁体）、泰文不加载任何网络字体，用系统字体，字体栈见 style.css 顶部的 --sans / --serif。
   - 字体来自 npm 包 @fontsource/ibm-plex-sans、@fontsource/ibm-plex-mono、@fontsource-variable/source-serif-4（均 5.3.0），SIL OFL 1.1 授权，授权文件在 ../fonts/ 里。
   - 字重只带 css/style.css 里实际用到的：Plex Sans 400/500/600/700，Plex Mono 400/500，Source Serif 4 的 400–500（和原来谷歌那条链接一致，opsz 光学尺寸轴保留）。
   - 注意：nginx 对 woff2 设了缓存一年（immutable），woff2 地址不带版本号；以后换字体文件时请同时改文件名。 */

/* IBM Plex Sans 400 vietnamese */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-sans-vietnamese-400-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Sans 400 latin-ext */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-ext-400-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Sans 400 latin */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-400-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* IBM Plex Sans 500 vietnamese */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-sans-vietnamese-500-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Sans 500 latin-ext */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-ext-500-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Sans 500 latin */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-500-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* IBM Plex Sans 600 vietnamese */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:600;font-display:swap;
  src:url(../fonts/ibm-plex-sans-vietnamese-600-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Sans 600 latin-ext */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:600;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-ext-600-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Sans 600 latin */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:600;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-600-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* IBM Plex Sans 700 vietnamese */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/ibm-plex-sans-vietnamese-700-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Sans 700 latin-ext */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-ext-700-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Sans 700 latin */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/ibm-plex-sans-latin-700-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* IBM Plex Mono 400 vietnamese */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-mono-vietnamese-400-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Mono 400 latin-ext */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-mono-latin-ext-400-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Mono 400 latin */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/ibm-plex-mono-latin-400-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* IBM Plex Mono 500 vietnamese */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-mono-vietnamese-500-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* IBM Plex Mono 500 latin-ext */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-mono-latin-ext-500-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* IBM Plex Mono 500 latin */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/ibm-plex-mono-latin-500-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* Source Serif 4 可变字体（opsz 8–60 + 字重） vietnamese */
@font-face{font-family:'Source Serif 4';font-style:normal;font-weight:400 500;font-display:swap;
  src:url(../fonts/source-serif-4-vietnamese-opsz-normal.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}

/* Source Serif 4 可变字体（opsz 8–60 + 字重） latin-ext */
@font-face{font-family:'Source Serif 4';font-style:normal;font-weight:400 500;font-display:swap;
  src:url(../fonts/source-serif-4-latin-ext-opsz-normal.woff2) format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* Source Serif 4 可变字体（opsz 8–60 + 字重） latin */
@font-face{font-family:'Source Serif 4';font-style:normal;font-weight:400 500;font-display:swap;
  src:url(../fonts/source-serif-4-latin-opsz-normal.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}