variable "aws_region" {
  description = "AWS region for the optional production-style K3s host."
  type        = string
  default     = "us-east-1"
}

variable "availability_zone" {
  description = "Availability zone for the subnet. Leave null to use the first AZ."
  type        = string
  default     = null
}

variable "instance_type" {
  description = "EC2 instance type for the lab node."
  type        = string
  default     = "t3.medium"
}

variable "ssh_key_name" {
  description = "Existing EC2 key pair name used for Ansible bootstrap."
  type        = string
}

variable "admin_cidr" {
  description = "CIDR allowed to SSH to the node; restrict this to your admin IP."
  type        = string
}

variable "ami_id" {
  description = "Ubuntu 22.04 LTS AMI ID for the selected region."
  type        = string
}