/* 自托管字体：IBM Plex Serif（正文）+ IBM Plex Mono（UI/代码）
   从 Google Fonts 下载的 latin 子集 woff2，放在 fonts/ 目录，本地加载、无需外网。
   中文不下载字体，直接使用系统字体（见 styles.css 变量），保证即时渲染。 */
@font-face { font-family: 'IBM Plex Serif'; font-style: italic; font-weight: 400; font-display: swap; src: url('fonts/plex-serif-400-italic.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Serif'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/plex-serif-400.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Serif'; font-style: normal; font-weight: 600; font-display: swap; src: url('fonts/plex-serif-600.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Serif'; font-style: normal; font-weight: 700; font-display: swap; src: url('fonts/plex-serif-700.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/plex-mono-400.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('fonts/plex-mono-500.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 600; font-display: swap; src: url('fonts/plex-mono-600.woff2') format('woff2'); }