Are there frameworks purely for mobile sites?

Question

Layout

Well, actually the essence of the issue in the topic. You need to create a lot of landing pages purely for mobile phones. No SEO, mobile-targeted traffic will flow from contextual advertising.
The goal is to make websites as light as possible. If something like Bootstrap is purely for mobile phones. Those. grid system, buttons, forms, etc. buns for layout with a minimum weight in kb.

Answer 1

Why mobile grid?
Grids are extremely important where there is no predictability in size and adaptability is required.
And if adaptability is required, it is no longer purely mobile.
write on Boilerplate HTML5 - that's enough for the eyes.

Answer 2

I don’t know if there is such a thing under Boostrap, but under foundation, you can assemble a package from the necessary components. For example, only one grid and loaves.

Answer 3

Are there frameworks purely for mobile sites?

no, but there are the most suitable ones, for example:
https://material-components.github.io/material-com... You
can assemble the grid yourself, as I understand it, the whole point of it is in dividing it into two versions, horizontal and portrait, and as a result something in 1 column, something in two. You can take ordinary grids, the same bs and change breakpoints
But when it comes to

a lot of landings

maybe it makes sense to collect your own? And the assembler to arrange the conveyor.