Correct the layout of standard MI components on the Bitrix CMS

You need to correct the catalog.section.list component and drop-down styles in the Smart Filter.

1. Now the catalog.section.list component displays the entire catalog structure (3 nesting levels) with a single sheet and text style. They differ only in the styles of the list markers. It is necessary that only the first-level sections are displayed, and sections of the 2 and 3 nesting levels are opened by click - as in the admin when navigating through the directory, without reloading the page. Each section has its own text style (size, color).

2. Now in the smart filter used standard (for this component) drop-down lists that themselves will not hide and need to scrawl the entire page. It is necessary that only the values in the list are hidden, and the page itself remains stationary. Like auto.ru.

3. Hide NOT active values in drop-down lists. Explanation: in the first list, select the brand of car, so in the second you need to show only those values of models that are available. Everyone's on the show now.

I only consider proposals with specific terms and price.

N.B.! The layout of the site is adaptive, on the bushstrap.