  The ladder kernel of the Bethe-Salpeter equation is amended by introducing a
different flavor dependence of the dressing functions in the heavy-quark
sector. Compared with earlier work this allows for the simultaneous calculation
of the mass spectrum and leptonic decay constants of light pseudoscalar mesons,
the $D_u$, $D_s$, $B_u$, $B_s$ and $B_c$ mesons and the heavy quarkonia
$\eta_c$ and $\eta_b$ within the same framework at a physical pion mass. The
corresponding Bethe-Salpeter amplitudes are projected onto the light front and
we reconstruct the distribution amplitudes of the mesons in the full theory. A
comparison with the first inverse moment of the heavy meson distribution
amplitude in heavy quark effective theory is made.
