The Custom Theme Studio plugin provides an all-in-one toolkit for designing, editing, and managing Obsidian themes visually. It combines a CSS variable manager, live CSS rule editor, and powerful export features-all accessible from a dedicated studio interface. Users can modify colors, fonts, and layout styles using real-time previews and selector-based styling tools. The integrated Ace editor supports syntax highlighting, auto-completion, Prettier formatting, and embedded color pickers for precise control. It also enables users to import fonts, define custom selectors, and export their themes as shareable packages with manifest files.