local Players = game:GetService("Players")
local StarterGui = game:GetService("StarterGui")
local UserInputService = game:GetService("UserInputService")
local VoiceChatService = game:GetService("VoiceChatService")
local player = Players.LocalPlayer

-- System Configuration
local MAX_HOTBAR = 5 
local clickThreshold = 15 
local SLOT_SIZE = 48 
local SLOT_PADDING = 10 
local INV_SLOT_SIZE = 50 

-- Tool Tracking State
local hotbarList = {}
local inventoryList = {}
local currentSearchText = ""

-- Feature States
local canMoveIcons = false
local canMoveHotbar = false

-- 1. Disable the default Roblox backpack UI
pcall(function() StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack, false) end)

-- 2. Create the ScreenGui Container
local screenGui = Instance.new("ScreenGui")
screenGui.Name = "DeltaInventorySystem"
screenGui.ResetOnSpawn = false
screenGui.IgnoreGuiInset = true 
screenGui.Parent = player:WaitForChild("PlayerGui")

-- Forward declaration for UI update & Revert function
local renderUI
local function revertToDefault()
    pcall(function() StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack, true) end)
    if screenGui then
        screenGui:Destroy()
    end
end

-- 3. Topbar Container & Icons
local baseOffsetX = 105 
local isVoiceEnabled = false
pcall(function() isVoiceEnabled = VoiceChatService:IsVoiceEnabledForUserIdAsync(player.UserId) end)
if isVoiceEnabled then baseOffsetX = baseOffsetX + 45 end

local topbarContainer = Instance.new("Frame")
topbarContainer.Name = "TopbarContainer"
topbarContainer.Size = UDim2.new(0, 85, 0, 36)
topbarContainer.Position = UDim2.new(0, baseOffsetX, 0, 4)
topbarContainer.BackgroundTransparency = 1
topbarContainer.Parent = screenGui

local toggleBtn = Instance.new("TextButton")
toggleBtn.Name = "InventoryToggle"
toggleBtn.Size = UDim2.new(0, 36, 0, 36)
toggleBtn.Position = UDim2.new(0, 0, 0, 0)
toggleBtn.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
toggleBtn.BackgroundTransparency = 0.2
toggleBtn.Text = "🎒"
toggleBtn.TextScaled = true
toggleBtn.Parent = topbarContainer
Instance.new("UICorner", toggleBtn).CornerRadius = UDim.new(0, 8)

local settingsBtn = Instance.new("TextButton")
settingsBtn.Name = "SettingsToggle"
settingsBtn.Size = UDim2.new(0, 36, 0, 36)
settingsBtn.Position = UDim2.new(0, 45, 0, 0)
settingsBtn.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
settingsBtn.BackgroundTransparency = 0.2
settingsBtn.Text = "⚙️"
settingsBtn.TextScaled = true
settingsBtn.Parent = topbarContainer
Instance.new("UICorner", settingsBtn).CornerRadius = UDim.new(0, 8)

local function addStroke(gui)
    local stroke = Instance.new("UIStroke")
    stroke.Color = Color3.fromRGB(150, 150, 150)
    stroke.Thickness = 1.2
    stroke.ApplyStrokeMode = Enum.ApplyStrokeMode.Border
    stroke.Parent = gui
end
addStroke(toggleBtn)
addStroke(settingsBtn)

-- 4. Dragging Helper Logic
local function makeDraggable(frame, triggerObjects, conditionFunc)
    local dragging, dragStart, startPos
    for _, obj in ipairs(triggerObjects) do
        obj.InputBegan:Connect(function(input)
            if conditionFunc() and (input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch) then
                dragging = true
                dragStart = input.Position
                startPos = frame.Position
            end
        end)
    end
    UserInputService.InputChanged:Connect(function(input)
        if dragging and (input.UserInputType == Enum.UserInputType.MouseMovement or input.UserInputType == Enum.UserInputType.Touch) then
            local delta = input.Position - dragStart
            frame.Position = UDim2.new(startPos.X.Scale, startPos.X.Offset + delta.X, startPos.Y.Scale, startPos.Y.Offset + delta.Y)
        end
    end)
    UserInputService.InputEnded:Connect(function(input)
        if input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch then
            dragging = false
        end
    end)
end

-- 5. Settings Panel
local settingsPanel = Instance.new("Frame")
settingsPanel.Name = "SettingsPanel"
settingsPanel.Size = UDim2.new(0, 250, 0, 270)
settingsPanel.Position = UDim2.new(0.5, -125, 0.4, -135)
settingsPanel.BackgroundColor3 = Color3.fromRGB(25, 25, 25)
settingsPanel.BackgroundTransparency = 0.1
settingsPanel.Visible = false
settingsPanel.Parent = screenGui
Instance.new("UICorner", settingsPanel).CornerRadius = UDim.new(0, 10)
addStroke(settingsPanel)

local setLayout = Instance.new("UIListLayout")
setLayout.Padding = UDim.new(0, 10)
setLayout.HorizontalAlignment = Enum.HorizontalAlignment.Center
setLayout.Parent = settingsPanel

local setPadding = Instance.new("UIPadding")
setPadding.PaddingTop = UDim.new(0, 15)
setPadding.Parent = settingsPanel

local setLabel = Instance.new("TextLabel")
setLabel.Size = UDim2.new(1, 0, 0, 20)
setLabel.BackgroundTransparency = 1
setLabel.Text = "Inventory Settings"
setLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
setLabel.Font = Enum.Font.Code
setLabel.TextSize = 18
setLabel.Parent = settingsPanel

local function createToggle(name, text, callback)
    local frame = Instance.new("Frame")
    frame.Size = UDim2.new(0.9, 0, 0, 30)
    frame.BackgroundTransparency = 1
    frame.Parent = settingsPanel
    
    local label = Instance.new("TextLabel")
    label.Size = UDim2.new(0.7, 0, 1, 0)
    label.BackgroundTransparency = 1
    label.Text = text
    label.TextColor3 = Color3.fromRGB(200, 200, 200)
    label.Font = Enum.Font.Code
    label.TextSize = 14
    label.TextXAlignment = Enum.TextXAlignment.Left
    label.Parent = frame
    
    local btn = Instance.new("TextButton")
    btn.Size = UDim2.new(0.3, 0, 0.8, 0)
    btn.Position = UDim2.new(0.7, 0, 0.1, 0)
    btn.BackgroundColor3 = Color3.fromRGB(150, 50, 50)
    btn.Text = "OFF"
    btn.TextColor3 = Color3.fromRGB(255, 255, 255)
    btn.Font = Enum.Font.Code
    btn.Parent = frame
    Instance.new("UICorner", btn).CornerRadius = UDim.new(0, 6)
    
    local state = false
    btn.MouseButton1Click:Connect(function()
        state = not state
        btn.BackgroundColor3 = state and Color3.fromRGB(50, 150, 50) or Color3.fromRGB(150, 50, 50)
        btn.Text = state and "ON" or "OFF"
        callback(state)
    end)
end

local function createCounter(labelName, getVal, setVal, minVal, maxVal)
    local frame = Instance.new("Frame")
    frame.Size = UDim2.new(0.9, 0, 0, 30)
    frame.BackgroundTransparency = 1
    frame.Parent = settingsPanel
    
    local label = Instance.new("TextLabel")
    label.Size = UDim2.new(0.5, 0, 1, 0)
    label.BackgroundTransparency = 1
    label.Text = labelName
    label.TextColor3 = Color3.fromRGB(200, 200, 200)
    label.Font = Enum.Font.Code
    label.TextSize = 14
    label.TextXAlignment = Enum.TextXAlignment.Left
    label.Parent = frame
    
    local minusBtn = Instance.new("TextButton")
    minusBtn.Size = UDim2.new(0.12, 0, 0.8, 0)
    minusBtn.Position = UDim2.new(0.55, 0, 0.1, 0)
    minusBtn.Text = "-"
    minusBtn.BackgroundColor3 = Color3.fromRGB(50, 50, 50)
    minusBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
    minusBtn.Parent = frame
    Instance.new("UICorner", minusBtn).CornerRadius = UDim.new(0, 4)
    
    local valLabel = Instance.new("TextLabel")
    valLabel.Size = UDim2.new(0.18, 0, 0.8, 0)
    valLabel.Position = UDim2.new(0.68, 0, 0.1, 0)
    valLabel.BackgroundTransparency = 1
    valLabel.Text = tostring(getVal())
    valLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
    valLabel.Font = Enum.Font.Code
    valLabel.TextSize = 14
    valLabel.Parent = frame

    local plusBtn = Instance.new("TextButton")
    plusBtn.Size = UDim2.new(0.12, 0, 0.8, 0)
    plusBtn.Position = UDim2.new(0.87, 0, 0.1, 0)
    plusBtn.Text = "+"
    plusBtn.BackgroundColor3 = Color3.fromRGB(50, 50, 50)
    plusBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
    plusBtn.Parent = frame
    Instance.new("UICorner", plusBtn).CornerRadius = UDim.new(0, 4)

    minusBtn.MouseButton1Click:Connect(function()
        local current = getVal()
        if current > minVal then
            setVal(current - 1)
            valLabel.Text = tostring(getVal())
            if renderUI then renderUI() end
        end
    end)

    plusBtn.MouseButton1Click:Connect(function()
        local current = getVal()
        if current < maxVal then
            setVal(current + 1)
            valLabel.Text = tostring(getVal())
            if renderUI then renderUI() end
        end
    end)
end

createCounter("Hotbar Size", function() return SLOT_SIZE end, function(v) SLOT_SIZE = v end, 25, 80)
createCounter("Hotbar Slots", function() return MAX_HOTBAR end, function(v) 
    MAX_HOTBAR = v 
    while #hotbarList > MAX_HOTBAR do
        table.insert(inventoryList, table.remove(hotbarList))
    end
end, 1, 10)

createToggle("IconMover", "Move Icons", function(state) canMoveIcons = state end)
createToggle("HotbarMover", "Move Hotbar", function(state) canMoveHotbar = state end)

-- Revert Button Inside Settings
local revertContainer = Instance.new("Frame")
revertContainer.Size = UDim2.new(0.9, 0, 0, 35)
revertContainer.BackgroundTransparency = 1
revertContainer.Parent = settingsPanel

local revertBtn = Instance.new("TextButton")
revertBtn.Size = UDim2.new(1, 0, 1, 0)
revertBtn.BackgroundColor3 = Color3.fromRGB(180, 40, 40)
revertBtn.Text = "REVERT TO DEFAULT"
revertBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
revertBtn.Font = Enum.Font.Code
revertBtn.TextSize = 14
revertBtn.Parent = revertContainer
Instance.new("UICorner", revertBtn).CornerRadius = UDim.new(0, 6)
addStroke(revertBtn)

revertBtn.MouseButton1Click:Connect(revertToDefault)

makeDraggable(topbarContainer, {toggleBtn, settingsBtn}, function() return canMoveIcons end)

-- 6. Inventory Container & Search Bar
local invContainer = Instance.new("Frame")
invContainer.Name = "InventoryContainer"
invContainer.Size = UDim2.new(0.6, 0, 0.5, 0)
invContainer.Position = UDim2.new(0.2, 0, 0.25, 0)
invContainer.BackgroundColor3 = Color3.fromRGB(25, 25, 25)
invContainer.BackgroundTransparency = 0.2
invContainer.BorderSizePixel = 0
invContainer.Visible = false
invContainer.Parent = screenGui
Instance.new("UICorner", invContainer).CornerRadius = UDim.new(0, 12)
addStroke(invContainer)

-- Drop Box with Warning Label
local dropBox = Instance.new("Frame")
dropBox.Name = "DropBox"
dropBox.Size = UDim2.new(0, 95, 0, 120)
dropBox.Position = UDim2.new(1, 10, 0, 0)
dropBox.BackgroundColor3 = Color3.fromRGB(150, 40, 40)
dropBox.BackgroundTransparency = 0.3
dropBox.Visible = false
dropBox.Parent = invContainer
Instance.new("UICorner", dropBox).CornerRadius = UDim.new(0, 8)
addStroke(dropBox)

local dropBoxText = Instance.new("TextLabel")
dropBoxText.Size = UDim2.new(1, 0, 0, 40)
dropBoxText.Position = UDim2.new(0, 0, 0, 10)
dropBoxText.BackgroundTransparency = 1
dropBoxText.Text = "DROP"
dropBoxText.TextColor3 = Color3.fromRGB(255, 255, 255)
dropBoxText.Font = Enum.Font.Code
dropBoxText.TextSize = 18
dropBoxText.TextScaled = true
dropBoxText.Parent = dropBox

local dropWarning = Instance.new("TextLabel")
dropWarning.Size = UDim2.new(1, -8, 0, 60)
dropWarning.Position = UDim2.new(0, 4, 0, 55)
dropWarning.BackgroundTransparency = 1
dropWarning.Text = "This doesnt work in some games"
dropWarning.TextColor3 = Color3.fromRGB(220, 220, 220)
dropWarning.Font = Enum.Font.Code
dropWarning.TextSize = 11
dropWarning.TextWrapped = true
dropWarning.TextXAlignment = Enum.TextXAlignment.Center
dropWarning.Parent = dropBox

-- Toggle DropBox visibility along with inventory
toggleBtn.MouseButton1Click:Connect(function() 
    invContainer.Visible = not invContainer.Visible 
    dropBox.Visible = invContainer.Visible
end)
settingsBtn.MouseButton1Click:Connect(function() settingsPanel.Visible = not settingsPanel.Visible end)

local searchIcon = Instance.new("TextLabel")
searchIcon.Size = UDim2.new(0, 30, 0, 35)
searchIcon.Position = UDim2.new(0, 15, 0, 10)
searchIcon.BackgroundTransparency = 1
searchIcon.Text = "🔎"
searchIcon.TextScaled = true
searchIcon.Parent = invContainer

local searchInput = Instance.new("TextBox")
searchInput.Size = UDim2.new(1, -65, 0, 35)
searchInput.Position = UDim2.new(0, 50, 0, 10)
searchInput.BackgroundColor3 = Color3.fromRGB(15, 15, 15)
searchInput.BackgroundTransparency = 0.3
searchInput.TextColor3 = Color3.fromRGB(200, 200, 200)
searchInput.Text = "" 
searchInput.PlaceholderText = "Search"
searchInput.Font = Enum.Font.Code
searchInput.TextSize = 16
searchInput.ClearTextOnFocus = false
searchInput.Parent = invContainer
Instance.new("UICorner", searchInput).CornerRadius = UDim.new(0, 6)
addStroke(searchInput)

local invScroll = Instance.new("ScrollingFrame")
invScroll.Size = UDim2.new(1, 0, 1, -55)
invScroll.Position = UDim2.new(0, 0, 0, 55)
invScroll.BackgroundTransparency = 1
invScroll.BorderSizePixel = 0
invScroll.ScrollBarThickness = 6
invScroll.Parent = invContainer

local gridLayout = Instance.new("UIGridLayout")
gridLayout.CellSize = UDim2.new(0, INV_SLOT_SIZE, 0, INV_SLOT_SIZE) 
gridLayout.CellPadding = UDim2.new(0, 10, 0, 10)
gridLayout.HorizontalAlignment = Enum.HorizontalAlignment.Center
gridLayout.SortOrder = Enum.SortOrder.LayoutOrder
gridLayout.Parent = invScroll

local gridPadding = Instance.new("UIPadding")
gridPadding.PaddingTop = UDim.new(0, 5)
gridPadding.Parent = invScroll

-- 7. Unified Hotbar Frame
local hotbarFrame = Instance.new("Frame")
hotbarFrame.Name = "HotbarFrame"
hotbarFrame.AnchorPoint = Vector2.new(0.5, 0) 
hotbarFrame.Position = UDim2.new(0.5, 0, 0.85, 0) 
hotbarFrame.BackgroundColor3 = Color3.fromRGB(20, 20, 20)
hotbarFrame.BackgroundTransparency = 0.3
hotbarFrame.Parent = screenGui
Instance.new("UICorner", hotbarFrame).CornerRadius = UDim.new(0, 16)
addStroke(hotbarFrame)

local listLayout = Instance.new("UIListLayout")
listLayout.FillDirection = Enum.FillDirection.Horizontal
listLayout.HorizontalAlignment = Enum.HorizontalAlignment.Center
listLayout.VerticalAlignment = Enum.VerticalAlignment.Center
listLayout.Padding = UDim.new(0, SLOT_PADDING) 
listLayout.Parent = hotbarFrame

makeDraggable(hotbarFrame, {hotbarFrame}, function() return canMoveHotbar end)

-- 8. Core Mechanics
local function isInside(pos, guiObject)
    if not guiObject.Visible then return false end
    local tl = guiObject.AbsolutePosition
    local br = tl + guiObject.AbsoluteSize
    return pos.X >= tl.X and pos.X <= br.X and pos.Y >= tl.Y and pos.Y <= br.Y
end

local function triggerDrop(tool)
    if not tool then return end
    tool.CanBeDropped = true
    tool.Parent = workspace
    local handle = tool:FindFirstChild("Handle")
    if handle and handle:IsA("BasePart") then
        local character = player.Character
        local hrp = character and character:FindFirstChild("HumanoidRootPart")
        if hrp then
            task.wait()
            handle.AssemblyLinearVelocity = (hrp.CFrame.LookVector * 15) + Vector3.new(0, 10, 0)
        end
    end
end

local function syncTools()
    local character = player.Character or player.CharacterAdded:Wait()
    local backpack = player:WaitForChild("Backpack")
    
    local currentTools = {}
    for _, item in ipairs(backpack:GetChildren()) do if item:IsA("Tool") then currentTools[item] = true end end
    for _, item in ipairs(character:GetChildren()) do if item:IsA("Tool") then currentTools[item] = true end end
    
    for i = #hotbarList, 1, -1 do if not currentTools[hotbarList[i]] then table.remove(hotbarList, i) end end
    for i = #inventoryList, 1, -1 do if not currentTools[inventoryList[i]] then table.remove(inventoryList, i) end end
    
    for tool in pairs(currentTools) do
        if not table.find(hotbarList, tool) and not table.find(inventoryList, tool) then
            if #hotbarList < MAX_HOTBAR then
                table.insert(hotbarList, tool)
            else
                table.insert(inventoryList, tool)
            end
        end
    end
end

renderUI = function()
    for _, child in ipairs(invScroll:GetChildren()) do if child:IsA("TextButton") then child:Destroy() end end
    for _, child in ipairs(hotbarFrame:GetChildren()) do if child:IsA("TextButton") then child:Destroy() end end

    local hotbarWidth = (MAX_HOTBAR * SLOT_SIZE) + ((MAX_HOTBAR - 1) * SLOT_PADDING) + 12
    hotbarFrame.Size = UDim2.new(0, hotbarWidth, 0, SLOT_SIZE + 10)

    local character = player.Character or player.CharacterAdded:Wait()
    local humanoid = character:WaitForChild("Humanoid")

    local function createSlot(tool, parentFrame)
        local btn = Instance.new("TextButton")
        btn.Name = tool.Name
        btn.Text = tool.Name
        btn.TextColor3 = Color3.fromRGB(200, 200, 200)
        btn.Font = Enum.Font.Code
        btn.TextScaled = true
        btn.Parent = parentFrame
        
        local corner = Instance.new("UICorner")
        corner.CornerRadius = UDim.new(0, 8)
        corner.Parent = btn
        
        local stroke = Instance.new("UIStroke")
        stroke.ApplyStrokeMode = Enum.ApplyStrokeMode.Border
        stroke.Parent = btn

        if parentFrame == hotbarFrame then
            btn.Size = UDim2.new(0, SLOT_SIZE, 0, SLOT_SIZE)
            btn.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
            btn.BackgroundTransparency = 0.4
            stroke.Thickness = 1
            if tool.Parent == character then
                btn.BackgroundColor3 = Color3.fromRGB(80, 80, 80)
                stroke.Color = Color3.fromRGB(220, 220, 220)
            else
                stroke.Color = Color3.fromRGB(100, 100, 100)
            end
        else
            btn.Size = UDim2.new(0, INV_SLOT_SIZE, 0, INV_SLOT_SIZE)
            btn.BackgroundColor3 = Color3.fromRGB(40, 40, 40)
            btn.BackgroundTransparency = 0.2
            stroke.Thickness = 1.2
            if tool.Parent == character then
                stroke.Color = Color3.fromRGB(220, 220, 220)
                btn.BackgroundColor3 = Color3.fromRGB(80, 80, 80)
            else
                stroke.Color = Color3.fromRGB(100, 100, 100)
            end
        end

        local dragging = false
        local dragInput, dragStart, ghostBtn
        local lastClickTick = 0

        btn.InputBegan:Connect(function(input)
            if not dragging and (input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch) then
                dragging = true
                dragInput = input
                dragStart = input.Position
            end
        end)

        UserInputService.InputChanged:Connect(function(input)
            if dragging and input == dragInput then
                local delta = input.Position - dragStart
                if delta.Magnitude >= clickThreshold then
                    if not ghostBtn then
                        ghostBtn = Instance.new("TextButton")
                        ghostBtn.Size = btn.Size
                        ghostBtn.Text = tool.Name
                        ghostBtn.TextScaled = true
                        ghostBtn.Font = Enum.Font.Code
                        ghostBtn.BackgroundColor3 = Color3.fromRGB(80, 80, 80)
                        ghostBtn.BackgroundTransparency = 0.5
                        ghostBtn.ZIndex = 10
                        ghostBtn.AnchorPoint = Vector2.new(0.5, 0.5)
                        Instance.new("UICorner", ghostBtn).CornerRadius = UDim.new(0, 8)
                        ghostBtn.Parent = screenGui
                        
                        btn.TextTransparency = 0.8
                        btn.BackgroundTransparency = 0.8
                    end
                    ghostBtn.Position = UDim2.new(0, input.Position.X, 0, input.Position.Y)
                end
            end
        end)

        UserInputService.InputEnded:Connect(function(input)
            if dragging and input == dragInput then
                dragging = false
                local delta = input.Position - dragStart

                if ghostBtn then
                    local dropPos = input.Position
                    ghostBtn:Destroy()
                    ghostBtn = nil

                    if isInside(dropPos, dropBox) then
                        local invIdx = table.find(inventoryList, tool)
                        if invIdx then table.remove(inventoryList, invIdx) end
                        local hotIdx = table.find(hotbarList, tool)
                        if hotIdx then table.remove(hotbarList, hotIdx) end
                        triggerDrop(tool)
                    elseif isInside(dropPos, hotbarFrame) then
                        if not table.find(hotbarList, tool) then
                            local invIdx = table.find(inventoryList, tool)
                            if invIdx then table.remove(inventoryList, invIdx) end
                            
                            if #hotbarList >= MAX_HOTBAR then
                                table.insert(inventoryList, table.remove(hotbarList, 1))
                            end
                            table.insert(hotbarList, tool)
                        end
                    elseif isInside(dropPos, invContainer) then
                        if not table.find(inventoryList, tool) then
                            local hotIdx = table.find(hotbarList, tool)
                            if hotIdx then table.remove(hotbarList, hotIdx) end
                            table.insert(inventoryList, tool)
                        end
                    end
                    renderUI() 
                else
                    if delta.Magnitude < clickThreshold then
                        if parentFrame == invScroll then
                            local currentTick = tick()
                            if currentTick - lastClickTick < 0.35 then
                                if #hotbarList < MAX_HOTBAR then
                                    local invIdx = table.find(inventoryList, tool)
                                    if invIdx then
                                        table.remove(inventoryList, invIdx)
                                        table.insert(hotbarList, tool)
                                        renderUI()
                                    end
                                end
                                lastClickTick = 0
                            else
                                lastClickTick = currentTick
                            end
                        else
                            if tool.Parent == character then humanoid:UnequipTools()
                            else humanoid:EquipTool(tool) end
                            renderUI()
                        end
                    end
                end
                dragInput = nil
            end
        end)
    end

    for _, tool in ipairs(hotbarList) do createSlot(tool, hotbarFrame) end
    for _, tool in ipairs(inventoryList) do 
        if currentSearchText == "" or string.find(string.lower(tool.Name), currentSearchText, 1, true) then
            createSlot(tool, invScroll) 
        end
    end
end
_G.updateUI = renderUI 

-- 9. Main Loop & Listeners
local function update()
    syncTools()
    renderUI()
end

searchInput:GetPropertyChangedSignal("Text"):Connect(function()
    currentSearchText = string.lower(searchInput.Text)
    renderUI()
end)

local function setupListeners()
    local backpack = player:WaitForChild("Backpack")
    backpack.ChildAdded:Connect(update)
    backpack.ChildRemoved:Connect(update)
    
    if player.Character then
        player.Character.ChildAdded:Connect(update)
        player.Character.ChildRemoved:Connect(update)
    end
end

player.CharacterAdded:Connect(function()
    task.wait(0.5)
    setupListeners()
    update()
end)

setupListeners()
update()