local function WorldToScreen(worldPos, camera)
    local cframe = camera.CFrame
    local rel = cframe:PointToObjectSpace(worldPos)
    if rel.Z >= 0 then return nil end -- Behind camera
    
    local fov = math.rad(camera.FieldOfView)
    local h = math.tan(fov / 2)
    local aspect = camera.ViewportSize.X / camera.ViewportSize.Y
    local w = h * aspect
    
    local screenX = ((-rel.X / rel.Z) / w + 1) * 0.5 * camera.ViewportSize.X
    local screenY = ((rel.Y / rel.Z) / h + 1) * 0.5 * camera.ViewportSize.Y
    return Vector2.new(screenX, screenY)
end