/* =============================================================================
 * GRIMSTRAND · Type system
 * Display = OptimusPrinceps (品牌一致,与 logo 同源)
 * Body    = 系统衬线栈(Iowan/Baskerville/Garamond/Georgia)+ CJK 衬线栈
 * 不依赖 Google Fonts CDN —— 国内访问 + 隐私 + 离线鲁棒
 * ========================================================================== */

@font-face {
  font-family: "OptimusPrinceps";
  src: url("../assets/fonts/OptimusPrinceps.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "OptimusPrinceps";
  src: url("../assets/fonts/OptimusPrincepsSemiBold.ttf") format("truetype");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

/* 衬线 body 栈
 *   - macOS:  Iowan Old Style / Apple Garamond
 *   - Win:    Baskerville Old Face / Georgia
 *   - Linux:  Liberation Serif / Georgia
 *   - 通用:   serif fallback
 * CJK body 栈:
 *   - 简中: Songti SC / STSong / Source Han Serif SC / 宋体
 *   - 繁中: Songti TC / Source Han Serif TC / PMingLiU
 *   - 日:   Hiragino Mincho ProN / Yu Mincho / MS Mincho
 *   - 韩:   Apple SD Gothic Neo / Nanum Myeongjo
 * Cyrillic 同栈,系统衬线已含西里尔字符。
 */

:root {
  --font-display: "OptimusPrinceps", "Trajan Pro", "Optima",
                  "Cinzel", Georgia, serif;
  --font-body: "Iowan Old Style", "Apple Garamond", "Baskerville",
               "Baskerville Old Face", "Hoefler Text", Garamond,
               "Times New Roman", Georgia,
               "Songti SC", "STSong", "Source Han Serif SC",
               "Hiragino Mincho ProN", "Yu Mincho",
               "Apple SD Gothic Neo", "Nanum Myeongjo",
               serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
}

/* CJK 模式下 body 字距/行高微调,衬线 CJK 视觉重量大于 Latin */
html[lang^="zh"] body,
html[lang^="ja"] body,
html[lang^="ko"] body {
  letter-spacing: 0.02em;
  line-height: 1.85;
}