is this section of the embed marketing refering to the appearance section in the app, or does it mean we can change the look via tailwind / css && use site specific fonts and sizes?

Key benefits of using embed

Styling customization is a breeze, can make it look like an indiscernible part of your website

High UI customization makes it a seamless experience from your website

No, it's much more than the appearance section. See a very simple demo of how you can customize the embed using css vars. All the css vars that are supported are in this file

thanks! so the

Cal("ui", {
        cssVarsPerTheme: {
          light: {
            "cal-brand": "blue",
            "cal-brand-emphasis": "red"
          },
          dark: {
            "cal-brand": "blue",
            "cal-brand-emphasis": "red"
            //...any other css variable defined in tailwind-preset.js
          }
        }

gives access to:

export type UiConfig = {
    hideEventTypeDetails?: boolean;
    theme?: EmbedThemeConfig;
    styles?: EmbedStyles & EmbedNonStylesConfig;
    cssVarsPerTheme?: Record<Theme, Record<string, string>>;
};

in embed.iframe.d.ts ?

Yeah