archsynth new clean render start from whitebox only use only the whitebox reference as the base start fresh and do not reuse any look from previous renders keep the sauna geometry 1 1 with the whitebox same openings same corner glass same hinged glass door position same frame thickness same bench layout same roof and base no redesign no extra mullions windows no warping no merged geometry you may improve materials lighting only exterior black charred wood vertical charred wood cladding deep carbon black important keep correct board rhythm with visible seams do not merge multiple boards into one wide plank finish deep matte not shiny fine subtle wood texture refined smooth not rough burnt crust premium craftsmanship frames profiles all visible frames mullions and corner posts around glass are black wood charred wood no visible metal anywhere no aluminum steel chrome keep exact thickness and positions from whitebox glass door glass corner side glass grey tinted smoked clean realistic reflections controlled not mirror interior thermowood walls horizontal boards each board width 120 mm visible seams not smooth panels ceiling must exist wood ceiling indirect led strip along ceiling perimeter edge hidden source warm soft glow benches show plank lines on bench fronts and tops do not turn into one solid slab keep rhythm do not merge into one board wood color warm medium brown thermowood thermo alder smooth premium finish subtle grain heater cylindrical heater in grey soapstone grey stone not white not black clean stone texture lighting mood premium minimal archviz studio render soft controlled highlights realistic contrast keep it clean and modern no overbright hdr negative no sliding doors if the whitebox shows a hinged door no added objects accessories signage no under bench led no extra lighting beyond the ceiling perimeter led no geometry changes no distortions no borrowed elements from earlier renders