sp_land_iron_nest_overall_project = {
	specialization = specialization_land
	project_tags = sp_tag_artillery

	available = {
		FROM = {
			has_tech = railway_gun
		}
	}

	# prototype_time is the duration scalar for each prototype iteration, not the
	# project's total calendar days. 30.6 is calibrated for large complexity to
	# produce an approximately 250-day estimate under the reference test setup.
	prototype_time = 30.6
	complexity = sp_complexity.large

	breakthrough_cost = {
		specialization_land = 1
	}

	resource_cost = {
		resources = {
			steel = 24
			tungsten = 12
			chromium = 8
		}
	}

	project_output = {
		country_effects = {
			set_technology = {
				iron_nest_equipment_unlock_tech = 1
				iron_nest_railway_gun_unlock_tech = 1
				iron_nest_naval_battery_unlock_tech = 1
				steel_rain_unlock_tech = 1
				popup = no
			}
			set_country_flag = iron_nest_overall_project_completed
			create_railway_gun = {
				equipment = iron_nest_railway_gun_equipment_1
				name = "铁巢双重奏列车炮"
			}
		}
	}

	generic_prototype_rewards = {
		sp_land_generic_reward_scientist_xp_1
		sp_land_generic_reward_scientist_xp_2
		sp_land_generic_reward_scientist_xp_3
		sp_land_generic_reward_army_xp_1
		sp_land_generic_reward_army_xp_2
		sp_land_generic_reward_army_xp_3
		sp_land_generic_reward_major_progress_1
		sp_land_generic_reward_major_progress_2
		sp_land_generic_reward_major_progress_3
		sp_land_generic_reward_test_failure_1
		sp_land_generic_reward_test_failure_2
		sp_land_generic_reward_test_failure_3
		sp_land_generic_reward_artillery_tech_1
		sp_land_generic_reward_artillery_tech_2
		sp_land_generic_reward_artillery_tech_3
		sp_land_generic_reward_artillery_bonus_1
		sp_land_generic_reward_artillery_bonus_2
		sp_land_generic_reward_artillery_bonus_3
		sp_land_generic_reward_resource_scarcity
		sp_land_generic_reward_critical_failure
	}
}
