For AI agents: the complete documentation index is available at https://a3s-lab.github.io/UI/en/llms.txt, the full documentation bundle is available at https://a3s-lab.github.io/UI/en/llms-full.txt, and this page is available as Markdown at https://a3s-lab.github.io/UI/en/foundations/typography.md.
A3S UI
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      • Typography

      A3S UI uses the operating system UI stack for fast loading and native text rendering across macOS, Windows, Linux, and CJK environments. Monospace content uses the platform code stack.

      Live previewHTML · CSS · JavaScript
      Display / 36

      Agent workspaces, made coherent.

      Heading / 20

      Workspace configuration

      Body / 14

      Readable density for operational tools, document editors, and long-running agent sessions.

      gateway.routing.strategy = "balanced"

      Families

      TokenStackUse
      --font-sansSystem UI, PingFang SC, Microsoft YaHei, Noto Sans CJK SCInterface and documentation text
      --font-monoSFMono-Regular, Consolas, Liberation Mono, MenloCode, identifiers, metrics, shortcuts

      Scale

      RoleSize / line heightWeightNotes
      Display36 / 40px600Marketing or empty-state statement
      Page title24 / 32px600One per view
      Section title16 / 24px600–650Settings cards and panels
      Control13 / 20px500–600Dense application chrome
      Body14 / 22px400Default documentation copy
      Caption12 / 16px400–500Metadata and status

      Parameters

      Override --font-sans and --font-mono at the application root. Preserve the scale and line-height relationships unless the product has a measured density requirement. Avoid putting status, file names, or long labels in all caps.