/* JetBrains Mono 自托管 (OFL) — 方案B等宽字体 */
@font-face { font-family:'JetBrains Mono'; src:url('/assets/fonts/jbm-400.woff2') format('woff2'); font-weight:400; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('/assets/fonts/jbm-500.woff2') format('woff2'); font-weight:500; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('/assets/fonts/jbm-700.woff2') format('woff2'); font-weight:700; font-display:swap; }
/* 退格键英文名"Backspace"9字符偏长: 单独缩到0.7×防左右溢出键帽(所有打字页键盘) */
.kb-key[data-key="back"] > span:not(.cap):not(.sub) { font-size: calc(var(--kb-fs, 16.5px) * 0.7); }