Relative path to bootstrap5/scss/style[.scss] is wrong

@SirClickalot
The extention is not required during import sass file.
May be issue due to other mistake.

It's definitely needed if you wish to override Bootstrap variables using SASS.

I have just installed a fresh Drupal 10 site and added the very latest BS5 theme (3.0.11) and created a new sub-theme via the UI.
I am certain that this is an error with the theme.

To clarify, if you create a sub-theme via the UI in the default place (i.e. /themes/custom) then the file...

themes/custom/b5subtheme/scss/style.scss

...has it's reference back to contrib' theme's style.scss is wrong.

It is set to...

// Include bootstrap.
@import '../../../themes/contrib/bootstrap5/scss/style';

When it should be...

// Include bootstrap.
@import '../../../../themes/contrib/bootstrap5/scss/style';

That is to say one level up.

@SirClickalot
I did not find issue with Bootstrap5 theme version as mention and created subtheme from UI.
I try to debug and created screenshot for better expiation.
Let me know if i am wrong somewhere.

@SirClickalot seems like PHP storm misconfigured. My cli sass works fine.

OK, I'm clearly outvoted here!
I'll go and check on what's going on with my PHP Storm.

Thanks both.