Theme Studio

Theme Studio is now called Site Style. Open it from Site ▾ › Site Style, or press ⌘K (Ctrl+K) and type "Site Style" ("theme studio" finds it too).

It does what Theme Studio did, and more: presets, colors, typography, spacing, radius, shadows, motion and breakpoints, with a live preview and an AI assistant. It opens in the main editor area instead of a dialog, and its Library imports a whole theme.css, not only colors. Apply Theme still writes src/styles/theme.css.

See Site Style for the full guide.