Fly player version - EricBerpa

-- Fly GUI v4 by EricBerpa | Standalone client controller for Roblox R6 and R15.
-- Install as a LocalScript in StarterPlayerScripts, or use the optional loader
-- in a client environment that explicitly provides loadstring and game:HttpGet.

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local UserInputService = game:GetService("UserInputService")
local Workspace = game:GetService("Workspace")

local player = Players.LocalPlayer
assert(player, "Fly GUI must run on the client, not the server.")
local playerGui = player:WaitForChild("PlayerGui", 10)
assert(playerGui, "Fly GUI could not find PlayerGui.")

local CONFIG = {
    DefaultSpeed = 50,
    MinSpeed = 10,
    MaxSpeed = 200,
    SpeedStep = 10,
    Smoothing = 12,
    ToggleKey = Enum.KeyCode.F,
    MinimizeKey = Enum.KeyCode.RightShift,
}
local GUI_NAME = "FlyGuiV4"
local CLOSE_EVENT = "Shutdown"

-- Shut down the previous controller before replacing its UI and constraints.
local previous = playerGui:FindFirstChild(GUI_NAME)
if previous then
    local shutdown = previous:FindFirstChild(CLOSE_EVENT)
    if shutdown and shutdown:IsA("BindableFunction") then
        pcall(function() shutdown:Invoke() end)
    end
    previous:Destroy()
end

local palette = {
    Background = Color3.fromRGB(17, 23, 35),
    Surface = Color3.fromRGB(29, 38, 53),
    Border = Color3.fromRGB(53, 66, 86),