Should i keep CSS of home page and landing pages in separate CSS file of big sites. ?

If i make site with a 7-8 different templates where 1 templates of home pages 1 is for inner content pages and other template for different type of landing pages.

and different style needed for same HTML elements in website ,

For example :

for inner pages H2 has different style but for landing pages H2 is different in color, font -size, line height, top bottom margin

How i should manage all this ? any tips to make good,easily manageable, scan-able CSS.

Thanks in advance.