Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
We recommend using decimals e.g. 1.3 as this makes the line height relate to your font size.
Yes, you can render react components.
Yes, this is possible by creating a custom element.
You don't. You apply a Descendant selector. These use a (Space).
Opacity is set using a decimal where 0 is transparent, 0.5 is 50% and 1 is solid.
If you want to add custom code to your website you can use Field formatters, Blocks and Custom Acquia Cohesion elements.
No site specific data is stored on the API.
Drupal content field data is NOT transmitted to the API. Only the underlying JSON schema and any information hard coded into templates and styles is transmitted.