:root{--font-family-sans-latin: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "HarmonyOS Sans SC", "Microsoft YaHei", "WenQuanYi Micro Hei", "WenQuanYi Zen Hei", sans-serif;--font-family-sans: var(--font-family-sans-latin), var(--font-family-sans-cjk);--font-family-mono: "SF Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;--font-family-serif: Georgia, "Times New Roman", Times, serif;--line-height-latin: 1.7;--line-height-zh: 1.65;--letter-spacing-latin: .015em;--letter-spacing-zh: .01em;--font-mono: var(--font-family-mono)}.os-windows{--font-family-sans-latin: "Space Grotesk", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "Space Grotesk", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;--font-family-sans: var(--font-family-sans-latin), var(--font-family-sans-cjk);--font-family-mono: "Consolas", "Courier New", monospace;--line-height-latin: 1.65;--line-height-zh: 1.6;--letter-spacing-latin: .01em;--letter-spacing-zh: .005em}.os-windows:not(.fonts-loaded){--font-family-sans-latin: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "Segoe UI", "Microsoft YaHei", "Source Han Sans SC", sans-serif}.os-macos{--font-family-sans-latin: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;--font-family-sans: var(--font-family-sans-latin), var(--font-family-sans-cjk);--font-family-mono: "SF Mono", "SFMono-Regular", Menlo, "Monaco", monospace;--line-height-latin: 1.7;--line-height-zh: 1.65;--letter-spacing-latin: .015em;--letter-spacing-zh: .01em}.os-linux{--font-family-sans-latin: "Ubuntu", "Roboto", "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", "WenQuanYi Zen Hei", sans-serif;--font-family-sans: var(--font-family-sans-latin), var(--font-family-sans-cjk);--font-family-mono: "Ubuntu Mono", "Liberation Mono", "Courier New", monospace;--line-height-latin: 1.65;--line-height-zh: 1.6;--letter-spacing-latin: .01em;--letter-spacing-zh: .005em}.os-linux:not(.fonts-loaded){--font-family-sans-latin: "Ubuntu", "Roboto", "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif}.font-fallback{--font-family-sans-latin: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-sans-cjk: "Segoe UI", "Microsoft YaHei", "Source Han Sans SC", sans-serif;--font-family-mono: "Consolas", "Courier New", monospace}html{font-family:var(--font-family-sans)}body{font-family:var(--font-family-sans);line-height:var(--line-height-latin);letter-spacing:var(--letter-spacing-latin)}html:lang(zh) body,html:lang(zh-CN) body,html:lang(zh-Hans) body{line-height:var(--line-height-zh);letter-spacing:var(--letter-spacing-zh)}html:lang(en) body,html:lang(en-US) body,html:lang(en-GB) body{line-height:var(--line-height-latin);letter-spacing:var(--letter-spacing-latin)}.font-sans{font-family:var(--font-family-sans)}.font-mono{font-family:var(--font-family-mono)}.font-serif{font-family:var(--font-family-serif)}