variable "cidr" {
  type        = string
  description = "VPC CIDR block, e.g. 10.0.0.0/16."
  default     = null
}

variable "azs" {
  type        = string
  description = "Comma-separated availability zones, e.g. us-east-1a,us-east-1b."
  default     = "us-east-1a"
}

variable "name" {
  type        = string
  description = "Name tag for the VPC and child resources."
  default     = "nova-vpc"
}

variable "region" {
  type        = string
  description = "AWS region (provider-level; not a resource arg)."
  default     = null
}