Question about the point foundation

Hello,

I plan to build a wooden house (permanently inhabited). Since I currently live in Romania, the budget is tight, and the risk of earthquakes here is relatively real (we experience several noticeable ones per year), I have decided on wood on point foundations. Ultimately, the building should rest slightly elevated (+/- 30 cm) on the point foundation pillars to provide a crawl space for maintenance, etc. The ground is regular soil. Dimensions of the finished building: 5.5 * 7 meters, one ground floor with a finished attic/loft.

Now to the actual question:
Is it sufficient if I pour and sink the concrete pillars along the exterior wall and support the floor joists with cross beams resting on simple, non-sunken concrete footings, or should I opt for sunk concrete pillars under the entire area?

Furthermore, it would be interesting to know whether there is still a need to excavate the entire floor area by about 15 cm and fill it with gravel, or if it is simply enough to remove all plants and lay the [Radon and moisture barrier] directly.

Thanks in advance for ideas :)