Can you share an image of the creative your working with here for context?
I would agree w/ Sanford that a .pdf seems like the wrong choice of application for something like this, but you could certainly style a Marketo form to not be so square and boring. I think it would take some careful thought and planning, and it would be a technically complex thing to do (Marketo forms are notorious tricky to style). The reason I might not go this route is that it'd be really hard to update the layout of the page and do much other than swap "this-field-for-that-field" b/c there'd have to be a ton of custom styling to get a form to look and behave like a custom LP layout.
That said, you might also think about putting together a Landing Page with custom inputs so you could have more freedom in your layout -- you wouldn't have to build it all in a form. You'd need a script to pull the inputs from your custom HTML fields on your Landing Page and populate those on a hidden Marketo form (or some other way of passing them to Marketo) to get a combination of the behavior and creative freedom your looking for. This route would be a bit easier to make changes to by comparison to using a form for the whole thing, but would require some script magic to pass the data between fields and post them to Marketo.
FWIW, I'd love to see what you've got in mind for the layout - I like thinking "outside the box" about different ways to put forms and landing pages to work in Marketo and this sounds like a really unique situation.
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As @SanfordWhiteman said, subtracting a specific value that was previously added is not technically possible. However, it is good practice to implement an "inactivity" score in any lead scoring model. This subtracts a specified amount of points from both the behaviour score and person score if no relevant activity was seen in the last x days.
An example for a situation where MQL threshold is 100: If no email click, web visit, form fill or event registration / attendance in the last 30 days, subtract 10 points from the total.
Hope this helps.
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