Unable to use VARs from a tfvars file in Terraform

I am new in Terraform. I am trying to setup some scripts for managing Cisco Catalyst Center (new name of Cisco DNA, but I am using the DNA Provider anyway :) ). I used an existing repo, that I've modified. I have structure that looks like this:

├── main.tf
├── variables.tf
├── modules 
│ └── site_settings 
│   └── site.tf 
│   └── variables.tf
├── Site-1
│ └── site-1.tfvars

In ./main.tf I have:

provider "dnacenter" {

    username = var.dnac_username
    password = var.dnac_password
    base_url = var.dnac_url
    debug = "true"
    ssl_verify = "false"
}

module "site_settings" {
  # Using m0_general_settings module to configure general settings
  source = "../modules/site_settings"

  dnac_username = var.dnac_username
  dnac_password = var.dnac_password
  dnac_url = var.dnac_url

  global_name = var.global_name
  region_name = var.region_name
  country_name = var.country_name
  city_name = var.city_name
  site_name = var.site_name
  buildings = var.buildings
  building_name = var.building_name
}

The ./modules/site_settings/site.tf has:

resource "dnacenter_area" "country" {
    provider = dnacenter
    parameters {
      site {
        area {
          name = var.country_name
          parent_name = "${var.global_name}/${var.region_name}"
        }
      }
    type = "area"
    }
  }
  
  resource "dnacenter_area" "city" {
    depends_on = [ dnacenter_area.country ]
    provider = dnacenter
    parameters {
      site {
        area {
          name = var.city_name
          parent_name = "${var.global_name}/${var.region_name}/${var.country_name}"
        }
      }
    type = "area"
    }
  }
  
  resource "dnacenter_area" "site" {
    depends_on = [ dnacenter_area.city ]
    provider = dnacenter
    parameters {
      site {
        area {
          name = var.site_name
          parent_name = "${var.parent_name}/${var.global_name}/${var.country_name}/${var.city_name}"
        }
      }
    type = "area"
    }
  }
  
**  resource "dnacenter_building" "building" {
    depends_on = [ dnacenter_area.site ]
    for_each = { for building in var.buildings : building.name => building }
    provider = dnacenter
    parameters {
      site {
        building {
          name        = "${each.value.building_name}"
          parent_name = "${var.global_name}/${var.region_name}/${var.country_name}/${var.city_name}/${each.value.parent_site_name}"
          latitude    = "${each.value.latitude}"
          longitude   = "${each.value.longitude}"
        }
      }
    type = "building"
    }
  }**

These are the varialbe values in ./site-1.tfvars :

dnac_username = "Cisco"
dnac_password = "Cisco123"
dnac_url = "https://my-dna-lab.test.net"
global_name = "Global"
region_name = "EMEA"
country_name = "Spain"
city_name = "Madrid"
site_name = "Site-1"
buildings = [
{
building_name = "B01"
parent_site_name = "Site-1"
latitude = "xx.xxxx"
longitude = "xx.xxxx"
},
{
building_name = "B02"
parent_site_name = "Site-1"
latitude = "xx.xxxx"
longitude = "xx.xxxx"
},
]

The variables are defined in both ./variables.tf and ./modules/site_settings/variables.tf ... not sure why :) :

variable "dnac_username" {
    sensitive = true
}
variable "dnac_password" {
    sensitive = true
}
variable "dnac_url" {
  type = string
}
variable "global_name" {
  type = string
}
variable "region_name" {
  type = string
}
variable "country_name" {
  type = string
}
variable "city_name" {
  type = string
}
variable "site_name" {
  type = string
}
variable "building_name" {
  type = string
}
variable "parent_site_name" {
  type = string
}

I have the variables.tf in the root and in the subfolder, not quite sure why .... but regardless if I keep them in only one of those I am still asked for the variables, even though I specify I want to use the ones from the site-1.tfvars file:

   ~/Doc/G/ccc  on   main ?1  terraform plan -out Site-1/site-1.tfplan **-var-file=Site-1/site-1.tfvars**
**var.building_name
  Enter a value: **

I would expect not to be asked for the variables defined in the tfvars file, I guess something is wrong with how variables are set/formatted in that tfvars file, or with my loop for the building. Can you please help? :) Thanks!

You should define ./variables.tf and ./modules/site_settings/variables.tf as a list, look like this:

variable "buildings" {
  description = "List of buildings"
  type = list(object({
    building_name    = string
    parent_site_name = string
    latitude         = string
    longitude        = string
  }))
}

Because of this :

parameters {
      site {
        building {
          name        = "${each.value.building_name}"
          parent_name = "${var.global_name}/${var.region_name}/${var.country_name}/${var.city_name}/${each.value.parent_site_name}"
          latitude    = "${each.value.latitude}"
          longitude   = "${each.value.longitude}"
        }
      }
    type = "building"
    }

And you provided a list:

buildings = [
 {
  building_name = "B01"
  parent_site_name = "Site-1"
  latitude = "xx.xxxx"
  longitude = "xx.xxxx"
 },
 {
  building_name = "B02"
  parent_site_name = "Site-1"
  latitude = "xx.xxxx"
  longitude = "xx.xxxx"
 },
]