The primary font is Roboto, sourced from Google Fonts. It is a modern sans-serif font that is highly readable on screens and is the standard for Material Design.

Responsiveness is handled primarily through a media query at 768px. On smaller screens, the sidebar becomes a fixed-position drawer that is toggled by the 'menu' icon in the header. This is a common and effective pattern for mobile-friendly dashboards.

Absolutely. The UI is built on a consistent set of CSS classes for cards, buttons, and form elements. You can easily create new components by composing these existing classes or by adding new styles that follow the established color and spacing conventions.