doesn't means 'notebook for designer'.
means ... Notebook that have not only notebook feature, but also good looking (or / and) more useful design.
* * *
For Example
This notebook cut obliquely to turn the pages easily. ( for more useful design ) <
This is a notebook with lacework. ( for good looking design ) <
Japanese stationery maker KOKUYO uses the word "" well. Those are slightly useful or slightly beautiful. (in Japanese or ).