# Cal.com — Style Reference
> Monochrome Utility, Human Touch. A system that prioritizes clarity and function with a stark black-and-white palette, but softens it with friendly typography and rounded forms.
**Theme:** light
Source measurements are normalized; roles and recommendations are interpreted. Font summary lists are independent, not paired by position. HTML examples are reconstructions, not source components.
The design feels like a pragmatic, high-precision instrument. It's built on a strict and disciplined monochrome palette of black, white, and echelon grays, where color is intentionally excluded from the core UI to emphasize function. The custom font, 'Cal Sans', defines the visual identity with its geometric yet open letterforms, giving headlines a technical but approachable character. Nearly all interactive elements are either solid black or pill-shaped outlines, creating a binary system of action. Cards are the fundamental building block, using soft 8-12px radii and extremely subtle shadows to create a quiet, layered topology on a light gray background.