  We propose the unified description of the early acceleration (cosmological
inflation) and the present epoch of so called "dark energy". The inflation can
be described by cosmic fluid with van der Waals equation of state and with
viscosity term. Viscosity leads to slow-roll inflation with the parameters such
as the spectral index, and the tensor-to-scalar ratio in concordance with
observational data. Our next step is to modify this equation of state (EoS) to
describe the present accelerated expansion. One can add the term into EoS so
that the contribution of which is small for inflation but crucial for late-time
acceleration. The key point of the model is possible phase transition which
leads to decrease of the viscosity. We show that proposed model describes
observational data about standard "candles" and correct dependence of Hubble
parameter from redshift. Moreover, we propose the possible scenario to resolve
dark matter problem.
