A very constrained democracy since the theocrats in charge severely limit the range of candidates
This is why I said the elected civilian governments run "99% of day to day life".
Things like garbage collection, policing, healthcare, education, and so on.
The Supreme Leader legitimates this entire rule through his person. He sets and shapes the whole ideological climate - through his Friday sermons, and through his power to control key appointments in the judiciary and the media.
Technically - he is able to intervene in every corner of Iranian life. He can overrule the president. He can directly intervene in the lawmaking process. He can nullify or allow nuclear agreements. In practice - however - this has been an increasingly rare occurrence.
His meddling in Iranian domestic life is probably at its lowest level since the late 1990s.
What he and his IRGC buddies are obsessed with is their Axis of Resistance - which is all outside the country, and completely unaccountable to the civilian government of Iran. But all these machinations with Hezbollahs, Houthis, and Hamas' has no bearing on life in Iran itself. There's a huge Chinese wall between these things. In fact, there's a great deal of hypocrisy where Iran promotes much more aggressive strains of thought abroad, in comparison to what it is prepared to tolerate at home.