general question about hikashop css style

Hi
since my last post i read many CSS book ( Front End ) and css style guide ( OOCSS SMACSS. ...) .Since it is about worflow it was general recommendation and without focus on CMS like joomla and don't find documentation in joomla website even if i have better understanding that do'nt take care of css order ( file , in style , beetween selector , specificity , internal ) can be a mess .....

When i read hikashop documentation it is more about a list of many CSS attribute name code (properties /values ) to resolve many specific problem for people who begin to learn /use css .

How is implemented hikashop ( module plug in component) refer to css selector Name and css file ( name number location ) ?
Does hikashop extension like joomla doc has article about
1- module class , module menu class and tag id ; Does hikashop support this ?
2- alternative layout and layout override : does hikahsop support this ?

3 Does hikashop has a documentation about recommandation for custom default hikashop template ?
4 Does the best way to study / understand default hikashop style is use a browser debugger tool ( inspector .......)
5 does hikashop make thing simple by only use for hikashop extension (CMP) only one css file !!!


Regard's

Thank' s a lot for the links