I've corrected the background mapping so that --color-base-100 now maps to --background (along with card, popover, and sidebar), while --color-base-200 maps to --muted and --secondary. This means the outline button background will use base-200 through the secondary variable mapping, giving it the desired lighter background while keeping the main page background as base-100.

I've made the shadcn textarea fully editable by removing the readonly property and adding an onChange handler. Now you can paste themes directly into the shadcn output textarea, edit them manually, and apply them using the existing "Apply Theme" button. The placeholder text has been updated to indicate that you can paste and edit themes directly in this field.