SCSS wins for maintainability. You could import your favourite design framework (say, bootstrap) as SCSS, change its variables to suit your design, and create

SCSS wins for maintainability. You could import your favourite design framework (say, bootstrap) as SCSS, change its variables to suit your design, and create any custom components using @extend: .custom-component { @extend .some-bootstrap-class } Also nothing prevents you from creating mixins, functions, etc. Just keep it first-order, as SCSS functions cannot return new functions.