-- ██╗     ██╗   ██╗ █████╗  ██████╗ ███████╗
-- ██║     ██║   ██║██╔══██╗██╔═══██╗██╔════╝
-- ██║     ██║   ██║███████║██║   ██║███████╗
-- ██║     ██║   ██║██╔══██║██║   ██║╚════██║
-- ███████╗╚██████╔╝██║  ██║╚██████╔╝███████║
-- ╚══════╝ ╚═════╝ ╚═╝  ╚═╝ ╚═════╝ ╚══════╝
--           v3.0 — Enhanced Edition
-- Paste into executor (Synapse, KRNL, Fluxus, Delta)

local Players        = game:GetService("Players")
local UIS            = game:GetService("UserInputService")
local TweenService   = game:GetService("TweenService")
local RunService     = game:GetService("RunService")

local player = Players.LocalPlayer

-- ── CONTAINER ──────────────────────────────────────────────────
local guiParent = (gethui and gethui()) or game:GetService("CoreGui")

-- Remove old copy
local old = guiParent:FindFirstChild("LuaOS_v3")
if old then old:Destroy() end
task.wait()

local gui = Instance.new("ScreenGui")
gui.Name            = "LuaOS_v3"
gui.ResetOnSpawn    = false
gui.ZIndexBehavior  = Enum.ZIndexBehavior.Global
gui.IgnoreGuiInset  = true
gui.Parent          = guiParent

-- ── THEMES ──────────────────────────────────────────────────────
local Themes = {
    Dark = {
        name     = "Dark",
        bg1      = Color3.fromRGB(8,  10, 22),
        bg2      = Color3.fromRGB(12, 16, 35),
        surface  = Color3.fromRGB(16, 21, 45),
        surface2 = Color3.fromRGB(22, 28, 58),
        border   = Color3.fromRGB(50, 65, 120),
        accent   = Color3.fromRGB(88, 130, 255),
        accent2  = Color3.fromRGB(110,160, 255),
        accentDk = Color3.fromRGB(55,  90, 200),
        text     = Color3.fromRGB(220, 228, 255),
        textDim  = Color3.fromRGB(110, 125, 175),
        textMut  = Color3.fromRGB(65,  78, 130),
        green    = Color3.fromRGB(50,  220, 110),
        red      = Color3.fromRGB(255,  70,  70),
        yellow   = Color3.fromRGB(255, 200,  50),
        term     = Color3.fromRGB(5,   7,  16),
        termTxt  = Color3.fromRGB(70,  240, 120),
        close    = Color3.fromRGB(220,  60,  60),
        minimize = Color3.fromRGB(240, 185,  35),
        maximize = Color3.fromRGB(50,  200, 80),
        winTitle = Color3.fromRGB(20,  26,  55),
        gradA    = Color3.fromRGB(8,10,25),
        gradB    = Color3.fromRGB(14,20,45),
        dotCol   = Color3.fromRGB(40,55,100),
    },
    Hacker = {
        name     = "Hacker",
        bg1      = Color3.fromRGB(2, 4, 2),
        bg2      = Color3.fromRGB(5, 12, 5),
        surface  = Color3.fromRGB(8, 18, 8),
        surface2 = Color3.fromRGB(12, 25, 12),
        border   = Color3.fromRGB(20, 80, 20),
        accent   = Color3.fromRGB(0, 255, 65),
        accent2  = Color3.fromRGB(50, 255, 100),
        accentDk = Color3.fromRGB(0, 150, 40),
        text     = Color3.fromRGB(180, 255, 190),
        textDim  = Color3.fromRGB(60, 140, 70),
        textMut  = Color3.fromRGB(30, 80, 35),
        green    = Color3.fromRGB(0, 255, 65),
        red      = Color3.fromRGB(255, 50, 50),
        yellow   = Color3.fromRGB(200, 255, 50),
        term     = Color3.fromRGB(0, 2, 0),
        termTxt  = Color3.fromRGB(0, 255, 65),
        close    = Color3.fromRGB(200, 40, 40),
        minimize = Color3.fromRGB(200, 200, 30),
        maximize = Color3.fromRGB(0, 200, 50),
        winTitle = Color3.fromRGB(5, 15, 5),
        gradA    = Color3.fromRGB(0,2,0),
        gradB    = Color3.fromRGB(5,15,5),
        dotCol   = Color3.fromRGB(0,60,10),
    },
    Sakura = {
        name     = "Sakura",
        bg1      = Color3.fromRGB(25, 10, 18),
        bg2      = Color3.fromRGB(35, 14, 28),
        surface  = Color3.fromRGB(42, 18, 35),
        surface2 = Color3.fromRGB(55, 24, 45),
        border   = Color3.fromRGB(120, 50, 90),
        accent   = Color3.fromRGB(255, 100, 160),
        accent2  = Color3.fromRGB(255, 140, 190),
        accentDk = Color3.fromRGB(180, 60, 110),
        text     = Color3.fromRGB(255, 220, 240),
        textDim  = Color3.fromRGB(170, 110, 145),
        textMut  = Color3.fromRGB(110, 60, 85),
        green    = Color3.fromRGB(100, 220, 150),
        red      = Color3.fromRGB(255, 70, 70),
        yellow   = Color3.fromRGB(255, 210, 100),
        term     = Color3.fromRGB(15, 5, 10),
        termTxt  = Color3.fromRGB(255, 130, 180),
        close    = Color3.fromRGB(220, 60, 60),
        minimize = Color3.fromRGB(240, 185, 35),
        maximize = Color3.fromRGB(100, 200, 120),
        winTitle = Color3.fromRGB(35, 14, 28),
        gradA    = Color3.fromRGB(20,8,15),
        gradB    = Color3.fromRGB(35,14,30),
        dotCol   = Color3.fromRGB(80,30,60),
    },
}

local T = Themes.Dark -- current theme
local ActiveTheme = "Dark"

-- ── HELPERS ────────────────────────────────────────────────────
local function tw(obj, props, t, style)
    TweenService:Create(obj,
        TweenInfo.new(t or .18, style or Enum.EasingStyle.Quad, Enum.EasingDirection.Out),
        props):Play()
end

local function c(cls, props, parent)
    local o = Instance.new(cls)
    for k,v in pairs(props) do
        pcall(function() o[k] = v end)
    end
    if parent then o.Parent = parent end
    return o
end

local function corner(p, r)
    return c("UICorner", {CornerRadius = UDim.new(0, r or 8)}, p)
end

local function stroke(p, col, thick, trans)
    return c("UIStroke", {Color = col or T.border, Thickness = thick or 1, Transparency = trans or .4}, p)
end

local function pad(p, px)
    local u = Instance.new("UIPadding")
    u.PaddingLeft   = UDim.new(0, px)
    u.PaddingRight  = UDim.new(0, px)
    u.PaddingTop    = UDim.new(0, px)
    u.PaddingBottom = UDim.new(0, px)
    u.Parent = p
end

local function gradient(p, a, b, rot)
    local g = Instance.new("UIGradient")
    g.Color = ColorSequence.new(a, b)
    g.Rotation = rot or 0
    g.Parent = p
    return g
end

local function hover(btn, norm, hov, prop)
    prop = prop or "BackgroundColor3"
    btn.MouseEnter:Connect(function() tw(btn, {[prop]=hov})  end)
    btn.MouseLeave:Connect(function() tw(btn, {[prop]=norm}) end)
end

local function shadow(parent, zIdx)
    local s = c("Frame", {
        Size = UDim2.new(1, 20, 1, 20),
        Position = UDim2.new(0, -10, 0, -10),
        BackgroundColor3 = Color3.new(0,0,0),
        BackgroundTransparency = .65,
        ZIndex = zIdx - 1,
        BorderSizePixel = 0,
    }, parent)
    corner(s, 14)
    return s
end

-- ── NOTIFICATION SYSTEM ───────────────────────────────────────
local notifContainer = c("Frame", {
    Size = UDim2.new(0, 320, 1, 0),
    Position = UDim2.new(1, -330, 0, 10),
    BackgroundTransparency = 1,
    ZIndex = 8000,
}, gui)
c("UIListLayout", {
    Padding = UDim.new(0, 8),
    VerticalAlignment = Enum.VerticalAlignment.Top,
    SortOrder = Enum.SortOrder.LayoutOrder,
}, notifContainer)

local function notify(title, text, duration, icon)
    local nf = c("Frame", {
        Size = UDim2.new(1, 0, 0, 70),
        BackgroundColor3 = T.bg2,
        BorderSizePixel = 0,
        ZIndex = 8001,
        BackgroundTransparency = 1,
    }, notifContainer)
    corner(nf, 10)
    stroke(nf, T.accent, 1, .3)

    -- Accent bar on left
    local bar = c("Frame", {
        Size = UDim2.new(0, 4, 1, -8),
        Position = UDim2.new(0, 4, 0, 4),
        BackgroundColor3 = T.accent,
        BorderSizePixel = 0,
        ZIndex = 8002,
    }, nf)
    corner(bar, 2)

    c("TextLabel", {
        Size = UDim2.new(0, 30, 0, 30),
        Position = UDim2.new(0, 14, 0, 8),
        BackgroundTransparency = 1,
        Text = icon or "🔔",
        TextSize = 20,
        ZIndex = 8002,
    }, nf)

    c("TextLabel", {
        Size = UDim2.new(1, -60, 0, 22),
        Position = UDim2.new(0, 48, 0, 6),
        BackgroundTransparency = 1,
        Text = title,
        Font = Enum.Font.GothamBold,
        TextSize = 14,
        TextColor3 = T.text,
        TextXAlignment = Enum.TextXAlignment.Left,
        ZIndex = 8002,
    }, nf)

    c("TextLabel", {
        Size = UDim2.new(1, -60, 0, 30),
        Position = UDim2.new(0, 48, 0, 28),
        BackgroundTransparency = 1,
        Text = text,
        Font = Enum.Font.Gotham,
        TextSize = 12,
        TextColor3 = T.textDim,
        TextXAlignment = Enum.TextXAlignment.Left,
        TextWrapped = true,
        ZIndex = 8002,
    }, nf)

    -- Appear animation
    tw(nf, {BackgroundTransparency = 0}, .3)

    task.delay(duration or 4, function()
        tw(nf, {BackgroundTransparency = 1, Size = UDim2.new(1, 0, 0, 0)}, .3)
        task.delay(.35, function() nf:Destroy() end)
    end)
end

-- ── FILE SYSTEM ───────────────────────────────────────────────
local FS = {}
local CWD = "/home/player"

local function fsNew(t, content)
    return {t=t, content=content or "", children={}, time=os.time()}
end

FS["/"]              = fsNew("dir")
FS["/bin"]           = fsNew("dir")
FS["/etc"]           = fsNew("dir")
FS["/home"]          = fsNew("dir")
FS["/home/player"]   = fsNew("dir")
FS["/home/player/Documents"] = fsNew("dir")
FS["/home/player/Music"]     = fsNew("dir")
FS["/tmp"]           = fsNew("dir")
FS["/var"]           = fsNew("dir")
FS["/var/log"]       = fsNew("dir")

local function regChild(parent, child)
    if FS[parent] then
        table.insert(FS[parent].children, child)
    end
end

regChild("/",           "/bin")
regChild("/",           "/etc")
regChild("/",           "/home")
regChild("/",           "/tmp")
regChild("/",           "/var")
regChild("/home",       "/home/player")
regChild("/home/player","/home/player/Documents")
regChild("/home/player","/home/player/Music")
regChild("/var",        "/var/log")

local function mkf(path, content, parent)
    FS[path] = fsNew("file", content)
    if parent then regChild(parent, path) end
end

mkf("/etc/hostname",              "luaos-roblox",                          "/etc")
mkf("/etc/motd",                  "Welcome to LuaOS v3.0!\nType 'help' for assistance.\nNew: neofetch, tree, grep, mkdir, mv, cp, fortune\n", "/etc")
mkf("/etc/os-release",            "NAME=LuaOS\nVERSION=3.0.0\nBUILD=Enhanced-Edition\nCODENAME=Aurora\n", "/etc")
mkf("/etc/passwd",                "root:x:0:0:root:/root\nplayer:x:1000:1000:"..player.Name..":/home/player\n", "/etc")
mkf("/home/player/readme.txt",    "Hello! This is LuaOS v3.0 — Enhanced Edition!\n\nNew features:\n  • 3 themes\n  • Calculator\n  • Music player\n  • System monitor\n  • Notifications\n  • Lock screen\n  • 12+ new terminal commands\n\nType 'neofetch' in terminal!\n", "/home/player")
mkf("/home/player/todo.txt",      "1. Try 'neofetch' in terminal\n2. Open settings and change theme\n3. Launch calculator\n4. ???\n5. PROFIT\n", "/home/player")
mkf("/home/player/Documents/notes.txt", "My notes:\n- LuaOS works great\n- Need to try all themes\n", "/home/player/Documents")
mkf("/tmp/session.log",           "Session started: "..os.date("%H:%M:%S").."\n", "/tmp")
mkf("/var/log/kernel.log",        "[OK] Kernel v3.0 loaded\n[OK] FS mounted\n[OK] Daemons started\n[OK] Window manager initialized\n[OK] Notification system started\n[OK] Theme: Dark applied\n", "/var/log")
mkf("/var/log/auth.log",          "[INFO] User "..player.Name.." authorized\n", "/var/log")

local function fsResolve(path)
    if path == "~" then return "/home/player" end
    if path:sub(1,2) == "~/" then
        path = "/home/player/" .. path:sub(3)
    end
    if path:sub(1,1) ~= "/" then
        path = (CWD == "/" and "/"..path) or (CWD.."/"..path)
    end
    local parts = {}
    for seg in path:gmatch("[^/]+") do
        if seg == ".." then table.remove(parts)
        elseif seg ~= "." then table.insert(parts, seg) end
    end
    return (#parts == 0 and "/") or ("/"..table.concat(parts,"/"))
end

local function fsRead(path)
    local nd = FS[fsResolve(path)]
    return nd and nd.t == "file" and nd.content or nil
end

local function fsWrite(path, content)
    local abs = fsResolve(path)
    if FS[abs] then
        FS[abs].content = content
        FS[abs].time = os.time()
    else
        FS[abs] = fsNew("file", content)
        local parentPath = abs:match("(.+)/[^/]+$") or "/"
        if FS[parentPath] and FS[parentPath].t == "dir" then
            table.insert(FS[parentPath].children, abs)
        end
    end
end

local function fsList(path)
    local node = FS[fsResolve(path)]
    return node and node.t == "dir" and node.children or nil
end

local function fsMkdir(path)
    local abs = fsResolve(path)
    if FS[abs] then return false, "already exists" end
    FS[abs] = fsNew("dir")
    local parentPath = abs:match("(.+)/[^/]+$") or "/"
    if FS[parentPath] and FS[parentPath].t == "dir" then
        table.insert(FS[parentPath].children, abs)
    end
    return true
end

-- ── KERNEL ───────────────────────────────────────────────────────
local Kernel = { procs={}, pid=1, boot=os.clock() }

local function kspawn(name, mem, sys)
    local id = Kernel.pid; Kernel.pid+=1
    Kernel.procs[id] = {
        pid=id, name=name, state="running",
        mem=mem or math.random(2,18), cpu=0,
        start=os.clock(), sys=sys or false
    }
    return id
end

local function kkill(pid)
    if not Kernel.procs[pid] then return false, "no process" end
    if Kernel.procs[pid].sys  then return false, "system process" end
    Kernel.procs[pid] = nil
    return true
end

kspawn("init",         0, true)
kspawn("kscheduler",   1, true)
kspawn("syslogd",      2, true)
kspawn("luaos-wm",     5, true)
kspawn("notifyd",      1, true)

RunService.Heartbeat:Connect(function(dt)
    for _, p in pairs(Kernel.procs) do
        p.cpu += dt * math.random(1,12)/100
    end
end)

-- ── DESKTOP ───────────────────────────────────────────────────
local desktop = c("Frame", {
    Size=UDim2.new(1,0,1,0),
    BackgroundColor3=T.bg1,
    BorderSizePixel=0,
    ZIndex=1,
}, gui)
local desktopGrad = gradient(desktop, T.gradA, T.gradB, 135)

-- Dot grid
local dots = c("Frame", {
    Size=UDim2.new(1,0,1,0),
    BackgroundTransparency=1,
    ZIndex=1,
}, desktop)

do
    local rows, cols = 20, 35
    for r=0, rows do
        for cc=0, cols do
            c("Frame", {
                Size=UDim2.new(0,2,0,2),
                Position=UDim2.new(cc/cols, 0, r/rows, 0),
                BackgroundColor3=T.dotCol,
                BackgroundTransparency=0.6,
                BorderSizePixel=0,
                ZIndex=1,
            }, dots)
        end
    end
end

-- ── WINDOWS SYSTEM ─────────────────────────────────────────────
local Z = 10
local WINS = {}
local OpenWinNames = {} -- for taskbar

local function makeDrag(handle, win)
    local drag, dstart, dpos = false, nil, nil
    handle.InputBegan:Connect(function(i)
        if i.UserInputType == Enum.UserInputType.MouseButton1 then
            drag=true; dstart=i.Position; dpos=win.Position
            i.Changed:Connect(function()
                if i.UserInputState==Enum.UserInputState.End then drag=false end
            end)
        end
    end)
    UIS.InputChanged:Connect(function(i)
        if drag and i.UserInputType==Enum.UserInputType.MouseMovement then
            local d=i.Position-dstart
            win.Position=UDim2.new(dpos.X.Scale, dpos.X.Offset+d.X,
                                   dpos.Y.Scale, dpos.Y.Offset+d.Y)
        end
    end)
end

local refreshTaskbar -- forward declare

local function newWindow(title, w, h, x, y)
    Z+=1
    local z = Z

    local win = c("Frame", {
        Size=UDim2.new(0,w,0,h),
        Position=UDim2.new(0,x or 200,0,y or 100),
        BackgroundColor3=T.surface,
        BorderSizePixel=0, ZIndex=z,
        ClipsDescendants=true,
    }, gui)
    corner(win, 10)
    stroke(win, T.accent, 1, .5)
    shadow(win, z)

    win.InputBegan:Connect(function(i)
        if i.UserInputType==Enum.UserInputType.MouseButton1 then
            Z+=1; win.ZIndex=Z
        end
    end)

    -- Title bar
    local bar = c("Frame", {
        Size=UDim2.new(1,0,0,38),
        BackgroundColor3=T.winTitle,
        BorderSizePixel=0, ZIndex=z+1,
    }, win)

    c("Frame", {
        Size=UDim2.new(1,0,0,1),
        Position=UDim2.new(0,0,1,-1),
        BackgroundColor3=T.accent,
        BackgroundTransparency=0.7,
        BorderSizePixel=0, ZIndex=z+2,
    }, bar)

    corner(bar, 10)
    c("Frame", {
        Size=UDim2.new(1,0,0.5,0),
        Position=UDim2.new(0,0,0.5,0),
        BackgroundColor3=T.winTitle,
        BorderSizePixel=0, ZIndex=z+1,
    }, bar)

    -- Control buttons (●●●)
    local function wbtn(col, xoff, sym, cb)
        local b = c("TextButton", {
            Size=UDim2.new(0,14,0,14),
            Position=UDim2.new(1,xoff,0.5,-7),
            BackgroundColor3=col,
            Text="", ZIndex=z+3, BorderSizePixel=0,
        }, bar)
        corner(b,7)
        local lbl=c("TextLabel", {
            Size=UDim2.new(1,0,1,0),
            BackgroundTransparency=1,
            Text=sym, TextColor3=Color3.new(0,0,0),
            Font=Enum.Font.GothamBold, TextSize=9,
            Visible=false, ZIndex=z+4,
        },b)
        b.MouseEnter:Connect(function() lbl.Visible=true  end)
        b.MouseLeave:Connect(function() lbl.Visible=false end)
        b.MouseButton1Click:Connect(cb)
        return b
    end

    local mini=false
    local maxi=false
    local orig=UDim2.new(0,w,0,h)
    local origPos=UDim2.new(0,x or 200,0,y or 100)
    local body

    -- Close
    wbtn(T.close, -22, "✕", function()
        tw(win,{Size=UDim2.new(0,w,0,0),BackgroundTransparency=1},.2)
        task.delay(.25, function()
            win:Destroy()
            WINS[title]=nil
            OpenWinNames[title]=nil
            if refreshTaskbar then refreshTaskbar() end
        end)
    end)

    -- Minimize
    wbtn(T.minimize, -40, "─", function()
        if mini then
            tw(win,{Size=orig},.2)
            if body then body.Visible=true end
            mini=false
        else
            tw(win,{Size=UDim2.new(0,w,0,38)},.2)
            task.delay(.15,function()
                if body then body.Visible=false end
            end)
            mini=true
        end
    end)

    -- Maximize (NEW)
    wbtn(T.maximize, -58, "□", function()
        if maxi then
            tw(win,{Size=orig, Position=origPos},.25)
            maxi=false
        else
            origPos=win.Position
            orig=win.Size
            tw(win,{Size=UDim2.new(1,0,1,-44), Position=UDim2.new(0,0,0,0)},.25)
            maxi=true
        end
        if mini then
            mini=false
            if body then body.Visible=true end
        end
    end)

    -- Title text
    c("TextLabel", {
        Size=UDim2.new(1,-120,1,0),
        Position=UDim2.new(0,14,0,0),
        BackgroundTransparency=1,
        Text=title, Font=Enum.Font.GothamBold,
        TextSize=13, TextColor3=T.text,
        TextXAlignment=Enum.TextXAlignment.Left,
        ZIndex=z+2,
    }, bar)

    body = c("Frame", {
        Size=UDim2.new(1,0,1,-38),
        Position=UDim2.new(0,0,0,38),
        BackgroundTransparency=1,
        ZIndex=z+1, ClipsDescendants=true,
    }, win)

    makeDrag(bar, win)

    -- Appear animation
    win.Size=UDim2.new(0,w,0,0)
    win.BackgroundTransparency=1
    tw(win,{Size=UDim2.new(0,w,0,h), BackgroundTransparency=0},.25,Enum.EasingStyle.Back)

    WINS[title]=win
    OpenWinNames[title]=true
    if refreshTaskbar then refreshTaskbar() end

    return win, body, z
end

-- ── TERMINAL COMMANDS ────────────────────────────────────────
local cmdHistory = {}

local Fortunes = {
    "Luck will smile on you today... or not.",
    "In the world of Lua, everything is possible, even the impossible.",
    "Error 404: luck not found. Try again later.",
    "Today is a good day for programming!",
    "It's not a bug, it's a feature. Remember that.",
    "The early bird gets to debug until noon.",
    "print('Hello World') — the beginning of great things.",
    "The best antivirus is common sense.",
    "Code is written once, but read a thousand times.",
    "Recursion: see Recursion.",
    "There are 10 types of people: those who understand binary and those who don't.",
    "Segfault? In Lua? Impossible!",
    "Patience and hard work will overcome everything... except an infinite loop.",
    "sudo make me a sandwich",
    "while true do sleep() end — the philosophy of life.",
}

local function runCmd(cmd, out)
    local args={}
    for a in cmd:gmatch("%S+") do table.insert(args,a) end
    local cc=args[1]
    if not cc or cc=="" then return end

    table.insert(cmdHistory, cmd)

    if cc=="help" then
        out("╔═══════════════════════════════════════════╗", T.accent)
        out("║       LuaOS Shell v3.0 — Help            ║", T.accent)
        out("╠═══════════════════════════════════════════╣", T.accent)
        out("║  File System:                             ║", T.accent2)
        out("║  ls [path]    — list files                ║", T.text)
        out("║  cd [path]    — change directory          ║", T.text)
        out("║  cat [file]   — read file                 ║", T.text)
        out("║  head [file]  — first 5 lines             ║", T.text)
        out("║  tail [file]  — last 5 lines              ║", T.text)
        out("║  echo [text]  — output / write > file     ║", T.text)
        out("║  touch [file] — create file               ║", T.text)
        out("║  mkdir [dir]  — create directory          ║", T.text)
        out("║  rm [file]    — delete file               ║", T.text)
        out("║  mv [a] [b]   — move                      ║", T.text)
        out("║  cp [a] [b]   — copy                      ║", T.text)
        out("║  wc [file]    — count lines/words         ║", T.text)
        out("║  grep [word] [file] — search              ║", T.text)
        out("║  tree [path]  — file tree                 ║", T.text)
        out("║  pwd          — current directory         ║", T.text)
        out("╠═══════════════════════════════════════════╣", T.accent2)
        out("║  System:                                  ║", T.accent2)
        out("║  ps           — processes                 ║", T.text)
        out("║  kill [pid]   — terminate process         ║", T.text)
        out("║  top          — CPU/RAM load              ║", T.text)
        out("║  mem          — RAM usage                 ║", T.text)
        out("║  uptime       — uptime                    ║", T.text)
        out("║  date         — date and time             ║", T.text)
        out("║  whoami       — username                  ║", T.text)
        out("║  hostname     — hostname                  ║", T.text)
        out("║  uname        — OS version                ║", T.text)
        out("║  neofetch     — system info               ║", T.text)
        out("║  history      — command history           ║", T.text)
        out("║  fortune      — random quote              ║", T.text)
        out("║  clear        — clear screen              ║", T.text)
        out("║  exit         — close terminal            ║", T.text)
        out("╚═══════════════════════════════════════════╝", T.accent)

    elseif cc=="neofetch" then
        local up=os.clock()-Kernel.boot
        local h=math.floor(up/3600)
        local m=math.floor(up%3600/60)
        local cnt=0; local mem=0
        for _,p in pairs(Kernel.procs) do cnt+=1; mem+=p.mem end

        out("", T.text)
        out("        ██╗     ██╗   ██╗ █████╗      "..player.Name.."@luaos", T.accent)
        out("        ██║     ██║   ██║██╔══██╗     ─────────────────", T.accent)
        out("        ██║     ██║   ██║███████║     OS:      LuaOS v3.0 Aurora", T.text)
        out("        ██║     ██║   ██║██╔══██║     Kernel:  Luau (Roblox)", T.text)
        out("        ███████╗╚██████╔╝██║  ██║     Uptime:  "..string.format("%02d:%02d", h, m), T.text)
        out("        ╚══════╝ ╚═════╝ ╚═╝  ╚═╝     Shell:   lsh 3.0", T.text)
        out("                                       Theme:   "..ActiveTheme, T.text)
        out("                                       Procs:   "..cnt, T.text)
        out("                                       RAM:     "..mem.."MB / 512MB", T.text)
        out("                                       Player:  "..player.DisplayName, T.text)
        out("                                       Game:    "..game.PlaceId, T.text)
        out("", T.text)
        -- Color palette
        local colors = "        "
        out(colors.."███ ███ ███ ███ ███ ███ ███ ███", T.accent)
        out("", T.text)

    elseif cc=="fortune" then
        out("🔮  "..Fortunes[math.random(#Fortunes)], T.yellow)

    elseif cc=="history" then
        out("  Command history:", T.accent)
        for i, cmd2 in ipairs(cmdHistory) do
            out(string.format("  %4d  %s", i, cmd2), T.text)
        end

    elseif cc=="tree" then
        local path = args[2] and fsResolve(args[2]) or CWD
        local function printTree(p, prefix)
            local nd = FS[p]
            if not nd or nd.t ~= "dir" then return end
            local ch = nd.children
            for i, cp in ipairs(ch) do
                local child = FS[cp]
                if not child then continue end
                local segs = cp:split("/")
                local nm = segs[#segs]
                local isLast = (i == #ch)
                local connector = isLast and "└── " or "├── "
                local icon = child.t == "dir" and "📁 " or "📄 "
                out(prefix .. connector .. icon .. nm, child.t == "dir" and T.accent2 or T.text)
                if child.t == "dir" then
                    local newPrefix = prefix .. (isLast and "    " or "│   ")
                    printTree(cp, newPrefix)
                end
            end
        end
        local segs = path:split("/")
        out("📂 " .. (segs[#segs] ~= "" and segs[#segs] or "/"), T.accent)
        printTree(path, "")

    elseif cc=="mkdir" then
        if not args[2] then out("mkdir: specify directory name", T.yellow); return end
        local ok, err = fsMkdir(args[2])
        if ok then
            out("Created directory: "..fsResolve(args[2]), T.textDim)
        else
            out("mkdir: "..tostring(err), T.red)
        end

    elseif cc=="mv" then
        if not args[2] or not args[3] then out("mv: specify source and destination", T.yellow); return end
        local src = fsResolve(args[2])
        local dst = fsResolve(args[3])
        if not FS[src] then out("mv: "..args[2]..": not found", T.red); return end
        FS[dst] = FS[src]
        FS[dst].time = os.time()
        FS[src] = nil
        -- Update parents
        for _, nd in pairs(FS) do
            if nd.t == "dir" then
                for i, ch in ipairs(nd.children) do
                    if ch == src then nd.children[i] = dst; break end
                end
            end
        end
        out("Moved: "..src.." → "..dst, T.textDim)

    elseif cc=="cp" then
        if not args[2] or not args[3] then out("cp: specify source and destination", T.yellow); return end
        local src = fsResolve(args[2])
        local dst = fsResolve(args[3])
        if not FS[src] or FS[src].t ~= "file" then out("cp: "..args[2]..": file not found", T.red); return end
        fsWrite(dst, FS[src].content)
        out("Copied: "..src.." → "..dst, T.textDim)

    elseif cc=="grep" then
        if not args[2] or not args[3] then out("grep: usage: grep [word] [file]", T.yellow); return end
        local pattern = args[2]
        local content = fsRead(fsResolve(args[3]))
        if not content then out("grep: "..args[3]..": file not found", T.red); return end
        local found = 0
        for _, ln in ipairs(content:split("\n")) do
            if ln:lower():find(pattern:lower()) then
                out(ln, T.green)
                found += 1
            end
        end
        if found == 0 then out("(no matches found)", T.textDim) end

    elseif cc=="head" then
        if not args[2] then out("head: specify file", T.yellow); return end
        local content = fsRead(fsResolve(args[2]))
        if not content then out("head: file not found", T.red); return end
        local lines = content:split("\n")
        local count = tonumber(args[3]) or 5
        for i = 1, math.min(count, #lines) do
            out(lines[i], T.text)
        end

    elseif cc=="tail" then
        if not args[2] then out("tail: specify file", T.yellow); return end
        local content = fsRead(fsResolve(args[2]))
        if not content then out("tail: file not found", T.red); return end
        local lines = content:split("\n")
        local count = tonumber(args[3]) or 5
        for i = math.max(1, #lines - count + 1), #lines do
            out(lines[i], T.text)
        end

    elseif cc=="wc" then
        if not args[2] then out("wc: specify file", T.yellow); return end
        local content = fsRead(fsResolve(args[2]))
        if not content then out("wc: file not found", T.red); return end
        local lines = #content:split("\n")
        local words = 0
        for _ in content:gmatch("%S+") do words += 1 end
        local bytes = #content
        out(string.format("  %d lines  %d words  %d bytes  %s", lines, words, bytes, args[2]), T.text)

    elseif cc=="ls" then
        local path = args[2] and fsResolve(args[2]) or CWD
        local ch = fsList(path)
        if not ch then out("ls: "..path..": no such path", T.red); return end
        if #ch==0 then out("(empty)", T.textDim); return end
        out("  " .. path .. ":", T.accent)
        for _, cp in ipairs(ch) do
            local nd=FS[cp]
            if nd then
                local segs=cp:split("/")
                local nm=segs[#segs]
                if nd.t=="dir" then
                    out("  📁  "..nm.."/", T.accent2)
                else
                    out(string.format("  📄  %-26s %dB", nm, #nd.content), T.text)
                end
            end
        end

    elseif cc=="cd" then
        local p = args[2] and fsResolve(args[2]) or "/home/player"
        if FS[p] and FS[p].t=="dir" then
            CWD=p; out("→ "..CWD, T.textDim)
        else
            out("cd: "..tostring(args[2])..": no such directory", T.red)
        end

    elseif cc=="pwd" then
        out(CWD, T.text)

    elseif cc=="cat" then
        if not args[2] then out("cat: specify file", T.yellow); return end
        local content=fsRead(fsResolve(args[2]))
        if content then
            for _,ln in ipairs(content:split("\n")) do out(ln, T.text) end
        else
            out("cat: "..args[2]..": file not found", T.red)
        end

    elseif cc=="echo" then
        local full=table.concat(args," ",2)
        local lpart, rpart=full:match("^(.-)%s*>%s*(.+)$")
        if lpart and rpart then
            fsWrite(fsResolve(rpart), lpart.."\n")
            out("Written → "..rpart, T.textDim)
        else
            out(full, T.text)
        end

    elseif cc=="touch" then
        if not args[2] then out("touch: specify filename", T.yellow); return end
        local abs=fsResolve(args[2])
        if not FS[abs] then
            fsWrite(abs,""); out("Created: "..abs, T.textDim)
        else
            out("File already exists", T.textDim)
        end

    elseif cc=="rm" then
        if not args[2] then out("rm: specify file", T.yellow); return end
        local abs=fsResolve(args[2])
        if not FS[abs] then out("rm: file not found", T.red); return end
        if FS[abs].t=="dir" then out("rm: this is a directory (use rm -r)", T.red); return end
        FS[abs]=nil
        for _, nd in pairs(FS) do
            if nd.t=="dir" then
                for i,ch in ipairs(nd.children) do
                    if ch==abs then table.remove(nd.children,i); break end
                end
            end
        end
        out("Deleted: "..abs, T.textDim)

    elseif cc=="ps" then
        out(string.format("  %-5s  %-22s  %-10s  %s","PID","NAME","STATUS","RAM"), T.accent)
        out("  "..("─"):rep(52), T.textMut)
        local sorted={}
        for _,p in pairs(Kernel.procs) do table.insert(sorted,p) end
        table.sort(sorted,function(a,b) return a.pid<b.pid end)
        for _,p in ipairs(sorted) do
            out(string.format("  %-5s  %-22s  %-10s  %dMB",
                p.pid, p.name, p.state, p.mem), p.state=="running" and T.green or T.textDim)
        end

    elseif cc=="kill" then
        local pid=tonumber(args[2])
        if not pid then out("kill: specify PID", T.yellow); return end
        local ok, err=kkill(pid)
        if ok then out("Process "..pid.." terminated ✓", T.green)
        else out("kill: "..tostring(err), T.red) end

    elseif cc=="top" then
        local total=512; local used=0; local cnt=0
        for _,p in pairs(Kernel.procs) do used+=p.mem; cnt+=1 end
        local pct=math.floor(used/total*100)
        local up=os.clock()-Kernel.boot
        out("── System Load ────────────────────────────", T.accent)
        out(string.format("  Uptime:    %.0f sec", up), T.text)
        out(string.format("  Processes: %d", cnt), T.text)
        out(string.format("  RAM:       %d / %d MB (%d%%)", used, total, pct), T.text)
        local bar=("█"):rep(math.floor(pct/5))..("░"):rep(20-math.floor(pct/5))
        out("  ["..bar.."]", pct>80 and T.red or pct>50 and T.yellow or T.green)

    elseif cc=="mem" then
        local total=512; local used=0
        for _,p in pairs(Kernel.procs) do used+=p.mem end
        local pct=math.floor(used/total*100)
        out(string.format("RAM: %dMB / %dMB  (%d%% used)", used, total, pct), T.text)
        out("["..("█"):rep(math.floor(pct/5))..("░"):rep(20-math.floor(pct/5)).."]", pct>80 and T.red or T.accent)

    elseif cc=="uptime" then
        local up=os.clock()-Kernel.boot
        out(string.format("Uptime: %02d:%02d:%02d", math.floor(up/3600), math.floor(up%3600/60), math.floor(up%60)), T.text)

    elseif cc=="date" then
        out(os.date("Date: %m/%d/%Y   Time: %H:%M:%S"), T.text)

    elseif cc=="whoami" then out(player.Name, T.text)
    elseif cc=="hostname" then out(fsRead("/etc/hostname") or "luaos", T.text)
    elseif cc=="uname" then out("LuaOS 3.0.0 Aurora (Luau/"..os.date("%Y")..") enhanced-edition", T.text)
    elseif cc=="clear" then return "clear"
    elseif cc=="exit" then return "exit"
    else
        out("lsh: "..cc..": command not found. Type 'help'", T.red)
    end
end

-- ── FORWARD DECLARATIONS ──────────────────────────────────────
local openTerminal, openNotepad, openTaskManager, openBrowser, openFiles
local openCalc, openSettings, openSysMonitor

-- ── TERMINAL ───────────────────────────────────────────────────
openTerminal = function()
    if WINS["Terminal"] and WINS["Terminal"].Parent then
        WINS["Terminal"].Visible=true; return
    end

    local win,body,z = newWindow("  ⌨  Terminal", 650, 460, 100, 60)

    local tbg = c("Frame", {
        Size=UDim2.new(1,0,1,0),
        BackgroundColor3=T.term,
        BorderSizePixel=0, ZIndex=z+1,
    }, body)

    local outScroll = c("ScrollingFrame", {
        Size=UDim2.new(1,0,1,-44),
        BackgroundTransparency=1, BorderSizePixel=0,
        ScrollBarThickness=3, ScrollBarImageColor3=T.accent,
        AutomaticCanvasSize=Enum.AutomaticSize.Y,
        CanvasSize=UDim2.new(0,0,0,0), ZIndex=z+2,
    }, tbg)
    c("UIListLayout", {Padding=UDim.new(0,1)}, outScroll)
    pad(outScroll, 10)

    local function addOut(txt, col)
        local lbl = c("TextLabel", {
            Size=UDim2.new(1,0,0,0),
            AutomaticSize=Enum.AutomaticSize.Y,
            BackgroundTransparency=1, Text=txt,
            Font=Enum.Font.Code, TextSize=13,
            TextColor3=col or T.termTxt,
            TextXAlignment=Enum.TextXAlignment.Left,
            TextWrapped=true, ZIndex=z+3,
        }, outScroll)
        task.defer(function()
            outScroll.CanvasPosition=Vector2.new(0,outScroll.AbsoluteCanvasSize.Y)
        end)
        return lbl
    end

    local inputRow = c("Frame", {
        Size=UDim2.new(1,0,0,40), Position=UDim2.new(0,0,1,-40),
        BackgroundColor3=Color3.fromRGB(10,12,24),
        BorderSizePixel=0, ZIndex=z+2,
    }, tbg)

    c("Frame", {
        Size=UDim2.new(1,0,0,1),
        BackgroundColor3=T.accent, BackgroundTransparency=0.7,
        BorderSizePixel=0, ZIndex=z+3,
    }, inputRow)

    local promptLbl = c("TextLabel", {
        Size=UDim2.new(0,0,1,0), AutomaticSize=Enum.AutomaticSize.X,
        Position=UDim2.new(0,10,0,0), BackgroundTransparency=1,
        Text=player.Name.."@luaos:"..CWD.."$ ",
        Font=Enum.Font.Code, TextSize=13, TextColor3=T.accent2, ZIndex=z+3,
    }, inputRow)

    local inputBox = c("TextBox", {
        Size=UDim2.new(1,-200,1,-8), Position=UDim2.new(0,180,0,4),
        BackgroundTransparency=1, Text="", PlaceholderText="enter command...",
        PlaceholderColor3=T.textMut, Font=Enum.Font.Code, TextSize=13,
        TextColor3=T.termTxt, TextXAlignment=Enum.TextXAlignment.Left,
        ClearTextOnFocus=false, ZIndex=z+3,
    }, inputRow)

    addOut("╔══════════════════════════════════════════════╗", T.accent)
    addOut("║        LuaOS Terminal v3.0 Aurora            ║", T.accent)
    addOut("║   Kernel: Luau   Platform: Roblox           ║", T.textDim)
    addOut("║   New: neofetch, tree, grep, mkdir, fortune ║", T.textDim)
    addOut("╚══════════════════════════════════════════════╝", T.accent)
    addOut("", T.text)
    addOut(fsRead("/etc/motd") or "", T.text)

    local hist={}; local hidx=0

    inputBox.FocusLost:Connect(function(enter)
        if not enter then return end
        local cmd2=inputBox.Text; inputBox.Text=""
        if cmd2=="" then return end
        table.insert(hist,cmd2); hidx=#hist+1
        addOut(player.Name.."@luaos:"..CWD.."$ "..cmd2, T.textDim)
        local r=runCmd(cmd2, addOut)
        if r=="clear" then
            for _,ch in ipairs(outScroll:GetChildren()) do
                if ch:IsA("TextLabel") then ch:Destroy() end
            end
        elseif r=="exit" then
            win:Destroy(); WINS["Terminal"]=nil; OpenWinNames["Terminal"]=nil
            if refreshTaskbar then refreshTaskbar() end
        end
        promptLbl.Text=player.Name.."@luaos:"..CWD.."$ "
        task.defer(function() inputBox:CaptureFocus() end)
    end)

    UIS.InputBegan:Connect(function(i,gp)
        if gp or not inputBox:IsFocused() then return end
        if i.KeyCode==Enum.KeyCode.Up then
            hidx=math.max(1,hidx-1); inputBox.Text=hist[hidx] or ""
        elseif i.KeyCode==Enum.KeyCode.Down then
            hidx=math.min(#hist+1,hidx+1); inputBox.Text=hist[hidx] or ""
        end
    end)

    task.defer(function() inputBox:CaptureFocus() end)
    kspawn("lsh", 3)
end

-- ── NOTEPAD ────────────────────────────────────────────────────
openNotepad = function()
    if WINS["Notepad"] and WINS["Notepad"].Parent then WINS["Notepad"].Visible=true; return end

    local win,body,z = newWindow("  📝  Notepad", 540, 420, 160, 90)
    local curFile = "/home/player/readme.txt"

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.surface,
        BorderSizePixel=0,ZIndex=z+1},body)

    local tb=c("Frame",{Size=UDim2.new(1,0,0,36),
        BackgroundColor3=T.surface2,BorderSizePixel=0,ZIndex=z+2},bg)

    local fileLbl=c("TextLabel",{
        Size=UDim2.new(1,-200,1,0),Position=UDim2.new(0,8,0,0),
        BackgroundTransparency=1,Text="📄 "..curFile,
        Font=Enum.Font.Gotham,TextSize=11,TextColor3=T.textDim,
        TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+3},tb)

    local saveBtn=c("TextButton",{
        Size=UDim2.new(0,90,0,26), Position=UDim2.new(1,-100,0.5,-13),
        BackgroundColor3=T.surface, Text="💾 Save",TextColor3=T.text,
        Font=Enum.Font.Gotham,TextSize=12, ZIndex=z+3,BorderSizePixel=0},tb)
    corner(saveBtn,5); stroke(saveBtn,T.border,1,.5)
    hover(saveBtn,T.surface,T.surface2)

    local ta=c("TextBox",{
        Size=UDim2.new(1,-16,1,-52), Position=UDim2.new(0,8,0,44),
        BackgroundColor3=T.bg1, Text=fsRead(curFile) or "",
        TextColor3=T.text, Font=Enum.Font.Code,TextSize=13,
        TextXAlignment=Enum.TextXAlignment.Left,
        TextYAlignment=Enum.TextYAlignment.Top,
        MultiLine=true,ClearTextOnFocus=false,
        TextWrapped=true,ZIndex=z+2,BorderSizePixel=0},bg)
    corner(ta,6); pad(ta,8); stroke(ta,T.border,1,.5)

    saveBtn.MouseButton1Click:Connect(function()
        fsWrite(curFile, ta.Text)
        fileLbl.Text="📄 "..curFile.."  ✓ Saved"
        notify("Notepad", "File saved: "..curFile, 3, "💾")
        task.delay(2,function() fileLbl.Text="📄 "..curFile end)
    end)
end

-- ── TASK MANAGER ─────────────────────────────────────────────
openTaskManager = function()
    if WINS["Task Manager"] and WINS["Task Manager"].Parent then
        WINS["Task Manager"].Visible=true; return
    end

    local win,body,z = newWindow("  📊  Task Manager", 520, 400, 200, 110)

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.surface,
        BorderSizePixel=0,ZIndex=z+1},body)

    local hdr=c("Frame",{Size=UDim2.new(1,0,0,30),
        BackgroundColor3=T.winTitle,BorderSizePixel=0,ZIndex=z+2},bg)
    stroke(hdr, T.border, 1, .5)

    local cols={
        {t="PID", w=.10, x=0},
        {t="Process",w=.38,x=.10},
        {t="Status",w=.22, x=.48},
        {t="RAM", w=.15, x=.70},
        {t="",   w=.15, x=.85},
    }
    for _,col in ipairs(cols) do
        c("TextLabel",{
            Size=UDim2.new(col.w,0,1,0), Position=UDim2.new(col.x,8,0,0),
            BackgroundTransparency=1, Text=col.t,Font=Enum.Font.GothamBold,TextSize=12,
            TextColor3=T.accent2,TextXAlignment=Enum.TextXAlignment.Left,
            ZIndex=z+3},hdr)
    end

    local list=c("ScrollingFrame",{
        Size=UDim2.new(1,0,1,-80), Position=UDim2.new(0,0,0,30),
        BackgroundTransparency=1,BorderSizePixel=0,
        ScrollBarThickness=3,ScrollBarImageColor3=T.accent,
        AutomaticCanvasSize=Enum.AutomaticSize.Y,
        CanvasSize=UDim2.new(0,0,0,0),ZIndex=z+2},bg)
    c("UIListLayout",{Padding=UDim.new(0,2)},list)
    pad(list,4)

    local rows={}

    local function refresh()
        for _,r in ipairs(rows) do r:Destroy() end; rows={}
        local sorted={}
        for _,p in pairs(Kernel.procs) do table.insert(sorted,p) end
        table.sort(sorted,function(a,b) return a.pid<b.pid end)

        for i,p in ipairs(sorted) do
            local row=c("Frame",{
                Size=UDim2.new(1,0,0,30),
                BackgroundColor3=i%2==0 and T.surface2 or T.surface,
                BorderSizePixel=0,ZIndex=z+3},list)
            corner(row,5)

            local datas={tostring(p.pid), p.name, p.state, p.mem.."MB"}
            for ci,col in ipairs(cols) do
                if ci <= 4 then
                    c("TextLabel",{
                        Size=UDim2.new(col.w,0,1,0), Position=UDim2.new(col.x,8,0,0),
                        BackgroundTransparency=1, Text=datas[ci],
                        Font=Enum.Font.Code,TextSize=12,
                        TextColor3=ci==3 and (p.state=="running" and T.green or T.textDim) or T.text,
                        TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+4},row)
                end
            end

            -- Kill button
            if not p.sys then
                local kb=c("TextButton",{
                    Size=UDim2.new(0,44,0,20), Position=UDim2.new(.85,4,0.5,-10),
                    BackgroundColor3=T.red, Text="Kill",
                    TextColor3=Color3.new(1,1,1), Font=Enum.Font.GothamBold,
                    TextSize=10, ZIndex=z+4, BorderSizePixel=0},row)
                corner(kb,4)
                kb.MouseButton1Click:Connect(function()
                    kkill(p.pid)
                    notify("Task Manager", "Process "..p.name.." terminated", 3, "📊")
                end)
            end

            table.insert(rows,row)
        end
    end

    local statBar=c("Frame",{
        Size=UDim2.new(1,0,0,46), Position=UDim2.new(0,0,1,-46),
        BackgroundColor3=T.winTitle, BorderSizePixel=0,ZIndex=z+2},bg)

    local statLbl=c("TextLabel",{
        Size=UDim2.new(1,-16,1,0),Position=UDim2.new(0,8,0,0),
        BackgroundTransparency=1,Text="",
        Font=Enum.Font.Code,TextSize=11,TextColor3=T.textDim,
        TextXAlignment=Enum.TextXAlignment.Left, RichText=true,ZIndex=z+3},statBar)

    local ramBg=c("Frame",{
        Size=UDim2.new(1,-16,0,4),Position=UDim2.new(0,8,0,38),
        BackgroundColor3=T.surface,BorderSizePixel=0,ZIndex=z+2},statBar)
    corner(ramBg,2)
    local ramBar=c("Frame",{
        Size=UDim2.new(0,0,0,4),Position=UDim2.new(0,8,0,38),
        BackgroundColor3=T.accent,BorderSizePixel=0,ZIndex=z+3},statBar)
    corner(ramBar,2)

    local conn=RunService.Heartbeat:Connect(function()
        local total=512; local used=0; local cnt=0
        for _,p in pairs(Kernel.procs) do used+=p.mem; cnt+=1 end
        local pct=math.floor(used/total*100)
        statLbl.Text=string.format("Processes: %d  │  RAM: %dMB/%dMB (%d%%)  │  ▲ %ds",
            cnt, used, total, pct, math.floor(os.clock()-Kernel.boot))
        tw(ramBar,{Size=UDim2.new(used/total,0,0,4)},.3)
        ramBar.BackgroundColor3=pct>80 and T.red or pct>50 and T.yellow or T.accent
    end)

    task.spawn(function()
        while win and win.Parent do refresh(); task.wait(0.5) end
        conn:Disconnect()
    end)
    refresh()
end

-- ── BROWSER ────────────────────────────────────────────────────
openBrowser = function()
    if WINS["Browser"] and WINS["Browser"].Parent then WINS["Browser"].Visible=true; return end

    local win,body,z = newWindow("  🌐  LuaSearch Browser", 600, 440, 180, 80)

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),
        BackgroundColor3=Color3.fromRGB(235,238,255),
        BorderSizePixel=0,ZIndex=z+1},body)

    local addrRow=c("Frame",{
        Size=UDim2.new(1,-16,0,36), Position=UDim2.new(0,8,0,6),
        BackgroundColor3=Color3.new(1,1,1),
        BorderSizePixel=0,ZIndex=z+2},bg)
    corner(addrRow,18); stroke(addrRow,T.accent,1,.3)

    local addrBox=c("TextBox",{
        Size=UDim2.new(1,-24,1,0),Position=UDim2.new(0,12,0,0),
        BackgroundTransparency=1, Text="luaos://home",
        Font=Enum.Font.Gotham,TextSize=13,
        TextColor3=Color3.fromRGB(30,40,80),
        ClearTextOnFocus=false,ZIndex=z+3},addrRow)

    local page=c("ScrollingFrame",{
        Size=UDim2.new(1,-16,1,-54), Position=UDim2.new(0,8,0,48),
        BackgroundColor3=Color3.new(1,1,1), BorderSizePixel=0,
        ScrollBarThickness=4, AutomaticCanvasSize=Enum.AutomaticSize.Y,
        CanvasSize=UDim2.new(0,0,0,0),ZIndex=z+2},bg)
    corner(page,8); stroke(page,T.border,1,.5)
    c("UIListLayout",{Padding=UDim.new(0,6)},page)
    pad(page,14)

    local pages={
        ["luaos://home"]={
            {h=1, t="🏠 LuaOS Browser v3.0"},
            {h=0, t="Welcome to the built-in LuaOS Browser!"},
            {h=2, t="Pages:"},
            {lnk="luaos://about"}, {lnk="luaos://docs"},
            {lnk="luaos://filesystem"}, {lnk="luaos://changelog"},
            {lnk="luaos://games"},
        },
        ["luaos://about"]={
            {h=1, t="ℹ️ About LuaOS"},
            {h=0, t="Version:    LuaOS 3.0.0 Aurora"},
            {h=0, t="Kernel:     Luau (Roblox Runtime)"},
            {h=0, t="Build:      Enhanced Edition"},
            {h=0, t="Codename:   Aurora"},
            {h=0, t="Started:    "..os.date("%H:%M:%S %m/%d/%Y")},
            {h=0, t="Player:     "..player.Name.." ("..player.DisplayName..")"},
            {h=0, t="UserID:     "..player.UserId},
            {lnk="luaos://home"},
        },
        ["luaos://docs"]={
            {h=1, t="📚 Documentation"},
            {h=2, t="Terminal — all commands:"},
            {h=0, t="  help, ls, cd, cat, head, tail, echo, touch, mkdir"},
            {h=0, t="  rm, mv, cp, wc, grep, tree, pwd"},
            {h=0, t="  ps, kill, top, mem, uptime, date"},
            {h=0, t="  whoami, hostname, uname, neofetch"},
            {h=0, t="  history, fortune, clear, exit"},
            {h=2, t="Applications:"},
            {h=0, t="  Terminal, Notepad, Task Manager"},
            {h=0, t="  Browser, Files, Calculator"},
            {h=0, t="  Settings, System Monitor"},
            {lnk="luaos://home"},
        },
        ["luaos://filesystem"]={
            {h=1, t="📁 File System"},
            {h=0, t="  /bin            — system utilities"},
            {h=0, t="  /etc            — configuration"},
            {h=0, t="  /home/player    — your folder"},
            {h=0, t="  /home/player/Documents — documents"},
            {h=0, t="  /home/player/Music     — music"},
            {h=0, t="  /tmp            — temporary files"},
            {h=0, t="  /var/log        — logs"},
            {lnk="luaos://home"},
        },
        ["luaos://changelog"]={
            {h=1, t="📋 Changelog"},
            {h=2, t="v3.0.0 Aurora:"},
            {h=0, t="  + 3 themes: Dark, Hacker, Sakura"},
            {h=0, t="  + Calculator"},
            {h=0, t="  + System monitor"},
            {h=0, t="  + Notification system (toasts)"},
            {h=0, t="  + Maximize window button"},
            {h=0, t="  + Taskbar shows open windows"},
            {h=0, t="  + 12 new terminal commands"},
            {h=0, t="  + neofetch with ASCII art"},
            {h=0, t="  + tree — file tree"},
            {h=0, t="  + grep, head, tail, wc, mkdir, mv, cp"},
            {h=0, t="  + fortune — random quotes"},
            {h=0, t="  + history — command history"},
            {h=0, t="  + Kill buttons in task manager"},
            {h=2, t="v2.0.0:"},
            {h=0, t="  + First release"},
            {lnk="luaos://home"},
        },
        ["luaos://games"]={
            {h=1, t="🎮 Mini-games"},
            {h=0, t="Coming soon! In the next version:"},
            {h=0, t="  • Guess the number"},
            {h=0, t="  • Tic-tac-toe"},
            {h=0, t="  • Snake"},
            {lnk="luaos://home"},
        },
    }

    local function render(url)
        for _,ch in ipairs(page:GetChildren()) do
            if ch:IsA("GuiObject") then ch:Destroy() end
        end
        local pg=pages[url]
        if not pg then
            c("TextLabel",{Size=UDim2.new(1,0,0,40),BackgroundTransparency=1,
                Text="404 — Page not found",
                Font=Enum.Font.GothamBold,TextSize=16,
                TextColor3=Color3.fromRGB(200,40,40),
                TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+3},page)
            return
        end
        for _,item in ipairs(pg) do
            if item.lnk then
                local b=c("TextButton",{
                    Size=UDim2.new(1,0,0,28),
                    BackgroundColor3=Color3.fromRGB(230,238,255),
                    Text="🔗  "..item.lnk,
                    Font=Enum.Font.Gotham,TextSize=13,
                    TextColor3=Color3.fromRGB(20,80,220),
                    TextXAlignment=Enum.TextXAlignment.Left,
                    BorderSizePixel=0,ZIndex=z+3},page)
                corner(b,5); pad(b,6)
                b.MouseButton1Click:Connect(function() addrBox.Text=item.lnk; render(item.lnk) end)
            elseif item.h==1 then
                c("TextLabel",{Size=UDim2.new(1,0,0,0),AutomaticSize=Enum.AutomaticSize.Y,
                    BackgroundTransparency=1,Text=item.t,
                    Font=Enum.Font.GothamBold,TextSize=22,
                    TextColor3=Color3.fromRGB(20,60,180),
                    TextXAlignment=Enum.TextXAlignment.Left,TextWrapped=true,ZIndex=z+3},page)
            elseif item.h==2 then
                c("TextLabel",{Size=UDim2.new(1,0,0,0),AutomaticSize=Enum.AutomaticSize.Y,
                    BackgroundTransparency=1,Text=item.t,
                    Font=Enum.Font.GothamBold,TextSize=15,
                    TextColor3=Color3.fromRGB(50,100,200),
                    TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+3},page)
            else
                c("TextLabel",{Size=UDim2.new(1,0,0,0),AutomaticSize=Enum.AutomaticSize.Y,
                    BackgroundTransparency=1,Text=item.t,
                    Font=Enum.Font.Code,TextSize=13,
                    TextColor3=Color3.fromRGB(30,40,70),
                    TextXAlignment=Enum.TextXAlignment.Left,TextWrapped=true,ZIndex=z+3},page)
            end
        end
    end
    render("luaos://home")
    addrBox.FocusLost:Connect(function(e) if e then render(addrBox.Text) end end)
end

-- ── FILE MANAGER ──────────────────────────────────────────────
openFiles = function()
    if WINS["Files"] and WINS["Files"].Parent then WINS["Files"].Visible=true; return end

    local win,body,z = newWindow("  📁  File Manager", 500, 420, 220, 100)
    local viewPath="/"

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.surface,
        BorderSizePixel=0,ZIndex=z+1},body)

    local bread=c("Frame",{Size=UDim2.new(1,0,0,34),
        BackgroundColor3=T.surface2,BorderSizePixel=0,ZIndex=z+2},bg)

    local pathLbl=c("TextLabel",{
        Size=UDim2.new(1,-8,1,0),Position=UDim2.new(0,8,0,0),
        BackgroundTransparency=1, Text="📂 /",
        Font=Enum.Font.Gotham,TextSize=12,TextColor3=T.text,
        TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+3},bread)

    local flist=c("ScrollingFrame",{
        Size=UDim2.new(1,-16,1,-50), Position=UDim2.new(0,8,0,40),
        BackgroundTransparency=1,BorderSizePixel=0,
        ScrollBarThickness=3,ScrollBarImageColor3=T.accent,
        AutomaticCanvasSize=Enum.AutomaticSize.Y,
        CanvasSize=UDim2.new(0,0,0,0),ZIndex=z+2},bg)
    c("UIListLayout",{Padding=UDim.new(0,3)},flist)

    local function renderDir(path)
        viewPath=path; pathLbl.Text="📂 "..path
        for _,ch in ipairs(flist:GetChildren()) do
            if ch:IsA("GuiObject") then ch:Destroy() end
        end

        if path~="/" then
            local segs=path:split("/"); table.remove(segs)
            local par=table.concat(segs,"/"); if par=="" then par="/" end
            local upb=c("TextButton",{Size=UDim2.new(1,0,0,34),
                BackgroundColor3=T.surface2, Text="",BorderSizePixel=0,ZIndex=z+3},flist)
            corner(upb,6)
            c("TextLabel",{Size=UDim2.new(1,-10,1,0),Position=UDim2.new(0,10,0,0),
                BackgroundTransparency=1, Text="⬆   ..",
                Font=Enum.Font.Gotham,TextSize=13,TextColor3=T.accent2,
                TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+4},upb)
            hover(upb,T.surface2,T.surface)
            upb.MouseButton1Click:Connect(function() renderDir(par) end)
        end

        local nd=FS[path]
        if not nd then return end
        for _,cp in ipairs(nd.children) do
            local child=FS[cp]
            if not child then continue end
            local segs=cp:split("/"); local nm=segs[#segs]
            local isDir=child.t=="dir"

            local row=c("TextButton",{Size=UDim2.new(1,0,0,34),
                BackgroundColor3=T.surface, Text="",BorderSizePixel=0,ZIndex=z+3},flist)
            corner(row,6); stroke(row,T.border,1,.6)
            hover(row,T.surface,T.surface2)

            c("TextLabel",{Size=UDim2.new(1,-10,1,0),Position=UDim2.new(0,10,0,0),
                BackgroundTransparency=1,
                Text=(isDir and "📁  " or "📄  ")..nm,
                Font=Enum.Font.Gotham,TextSize=13,
                TextColor3=isDir and T.accent2 or T.text,
                TextXAlignment=Enum.TextXAlignment.Left,ZIndex=z+4},row)

            if not isDir then
                c("TextLabel",{Size=UDim2.new(0,60,1,0),Position=UDim2.new(1,-65,0,0),
                    BackgroundTransparency=1, Text=#child.content.."B",
                    Font=Enum.Font.Code,TextSize=11,TextColor3=T.textMut, ZIndex=z+4},row)
            end

            row.MouseButton1Click:Connect(function()
                if isDir then renderDir(cp) end
            end)
        end
    end
    renderDir("/")
end

-- ── CALCULATOR (NEW) ───────────────────────────────────────────
openCalc = function()
    if WINS["Calculator"] and WINS["Calculator"].Parent then
        WINS["Calculator"].Visible=true; return
    end

    local win,body,z = newWindow("  🧮  Calculator", 280, 400, 300, 100)

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.bg1,
        BorderSizePixel=0,ZIndex=z+1},body)

    -- Display
    local display=c("TextLabel",{
        Size=UDim2.new(1,-16,0,70), Position=UDim2.new(0,8,0,8),
        BackgroundColor3=T.surface, Text="0",
        Font=Enum.Font.Code, TextSize=32, TextColor3=T.text,
        TextXAlignment=Enum.TextXAlignment.Right,
        ZIndex=z+2, BorderSizePixel=0},bg)
    corner(display,8); pad(display,12)

    local expr = ""
    local lastResult = ""

    local function updateDisplay()
        display.Text = (expr == "" and "0") or expr
    end

    local buttons = {
        {"C", "⌫", "%", "÷"},
        {"7", "8", "9", "×"},
        {"4", "5", "6", "-"},
        {"1", "2", "3", "+"},
        {"±", "0", ".", "="},
    }

    local grid = c("Frame",{
        Size=UDim2.new(1,-16,1,-96), Position=UDim2.new(0,8,0,86),
        BackgroundTransparency=1, ZIndex=z+1},bg)

    for ri, row in ipairs(buttons) do
        for ci, label in ipairs(row) do
            local isOp = (label == "÷" or label == "×" or label == "-" or label == "+" or label == "=")
            local isSpecial = (label == "C" or label == "⌫" or label == "%" or label == "±")

            local btnColor = isOp and T.accent or isSpecial and T.surface2 or T.surface
            local txtColor = isOp and Color3.new(1,1,1) or T.text

            local btn = c("TextButton",{
                Size = UDim2.new(0.25, -6, 0.2, -6),
                Position = UDim2.new((ci-1)*0.25, 3, (ri-1)*0.2, 3),
                BackgroundColor3 = btnColor,
                Text = label,
                Font = Enum.Font.GothamBold,
                TextSize = 20,
                TextColor3 = txtColor,
                ZIndex = z+2,
                BorderSizePixel = 0,
            }, grid)
            corner(btn, 8)

            btn.MouseButton1Click:Connect(function()
                if label == "C" then
                    expr = ""; updateDisplay()
                elseif label == "⌫" then
                    expr = expr:sub(1, -2); updateDisplay()
                elseif label == "±" then
                    if expr:sub(1,1) == "-" then
                        expr = expr:sub(2)
                    else
                        expr = "-" .. expr
                    end
                    updateDisplay()
                elseif label == "=" then
                    local eval = expr:gsub("×","*"):gsub("÷","/")
                    local fn = loadstring("return " .. eval)
                    if fn then
                        local ok, result = pcall(fn)
                        if ok then
                            lastResult = tostring(result)
                            display.Text = lastResult
                            expr = lastResult
                        else
                            display.Text = "Error"
                            expr = ""
                        end
                    else
                        display.Text = "Error"
                        expr = ""
                    end
                else
                    expr = expr .. label
                    updateDisplay()
                end
            end)
        end
    end
    kspawn("calc", 2)
end

-- ── SETTINGS (NEW) ─────────────────────────────────────────────
openSettings = function()
    if WINS["Settings"] and WINS["Settings"].Parent then
        WINS["Settings"].Visible=true; return
    end

    local win,body,z = newWindow("  ⚙  Settings", 420, 380, 250, 100)

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.surface,
        BorderSizePixel=0,ZIndex=z+1},body)

    c("TextLabel",{
        Size=UDim2.new(1,-16,0,30), Position=UDim2.new(0,8,0,10),
        BackgroundTransparency=1, Text="🎨 Choose a theme",
        Font=Enum.Font.GothamBold, TextSize=16, TextColor3=T.text,
        TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+2},bg)

    local themeList = c("Frame",{
        Size=UDim2.new(1,-16,0,280), Position=UDim2.new(0,8,0,48),
        BackgroundTransparency=1, ZIndex=z+1},bg)
    c("UIListLayout",{Padding=UDim.new(0,8)},themeList)

    local themeData = {
        {name="Dark", desc="Classic dark theme", icon="🌙", preview={Color3.fromRGB(8,10,22), Color3.fromRGB(88,130,255)}},
        {name="Hacker", desc="Matrix. Green code.", icon="💻", preview={Color3.fromRGB(2,4,2), Color3.fromRGB(0,255,65)}},
        {name="Sakura", desc="Soft pink theme", icon="🌸", preview={Color3.fromRGB(25,10,18), Color3.fromRGB(255,100,160)}},
    }

    for _, td in ipairs(themeData) do
        local row = c("Frame",{
            Size=UDim2.new(1,0,0,75),
            BackgroundColor3=T.surface2,
            BorderSizePixel=0, ZIndex=z+2},themeList)
        corner(row,10); stroke(row, T.border, 1, .4)

        -- Color preview
        local preview = c("Frame",{
            Size=UDim2.new(0,50,0,50), Position=UDim2.new(0,12,0.5,-25),
            BackgroundColor3=td.preview[1], BorderSizePixel=0, ZIndex=z+3},row)
        corner(preview,8); stroke(preview, td.preview[2], 2, 0)

        c("TextLabel",{
            Size=UDim2.new(0,30,0,30), Position=UDim2.new(0,10,0,10),
            BackgroundTransparency=1, Text=td.icon,
            TextSize=24, ZIndex=z+4},preview)

        c("TextLabel",{
            Size=UDim2.new(1,-160,0,22), Position=UDim2.new(0,74,0,12),
            BackgroundTransparency=1, Text=td.name,
            Font=Enum.Font.GothamBold, TextSize=16, TextColor3=T.text,
            TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+3},row)

        c("TextLabel",{
            Size=UDim2.new(1,-160,0,18), Position=UDim2.new(0,74,0,36),
            BackgroundTransparency=1, Text=td.desc,
            Font=Enum.Font.Gotham, TextSize=12, TextColor3=T.textDim,
            TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+3},row)

        local active = (ActiveTheme == td.name)
        local applyBtn = c("TextButton",{
            Size=UDim2.new(0,80,0,30), Position=UDim2.new(1,-92,0.5,-15),
            BackgroundColor3=active and T.green or T.accentDk,
            Text=active and "✓ Active" or "Apply",
            TextColor3=Color3.new(1,1,1),
            Font=Enum.Font.GothamBold, TextSize=12,
            ZIndex=z+3, BorderSizePixel=0},row)
        corner(applyBtn,6)

        applyBtn.MouseButton1Click:Connect(function()
            if Themes[td.name] then
                ActiveTheme = td.name
                T = Themes[td.name]
                notify("Settings", "Theme '"..td.name.."' applied!\nRestart script for full effect.", 5, "🎨")
            end
        end)
    end
end

-- ── SYSTEM MONITOR (NEW) ─────────────────────────────────────
openSysMonitor = function()
    if WINS["Monitor"] and WINS["Monitor"].Parent then
        WINS["Monitor"].Visible=true; return
    end

    local win,body,z = newWindow("  📈  System Monitor", 380, 340, 280, 120)

    local bg=c("Frame",{Size=UDim2.new(1,0,1,0),BackgroundColor3=T.surface,
        BorderSizePixel=0,ZIndex=z+1},body)

    local labels = {}
    local info = {
        {lbl="OS:", key="os"},
        {lbl="Version:", key="ver"},
        {lbl="Kernel:", key="kern"},
        {lbl="Uptime:", key="up"},
        {lbl="Processes:", key="procs"},
        {lbl="RAM:", key="ram"},
        {lbl="Player:", key="player"},
        {lbl="Display:", key="display"},
        {lbl="Game ID:", key="game"},
        {lbl="FPS:", key="fps"},
    }

    for i, item in ipairs(info) do
        c("TextLabel",{
            Size=UDim2.new(0,100,0,24), Position=UDim2.new(0,12,0,10+(i-1)*28),
            BackgroundTransparency=1, Text=item.lbl,
            Font=Enum.Font.GothamBold, TextSize=13, TextColor3=T.accent2,
            TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+2},bg)

        labels[item.key] = c("TextLabel",{
            Size=UDim2.new(1,-130,0,24), Position=UDim2.new(0,115,0,10+(i-1)*28),
            BackgroundTransparency=1, Text="...",
            Font=Enum.Font.Code, TextSize=13, TextColor3=T.text,
            TextXAlignment=Enum.TextXAlignment.Left, ZIndex=z+2},bg)
    end

    local lastTick = os.clock()
    local fps = 60

    local conn = RunService.Heartbeat:Connect(function(dt)
        fps = math.floor(1/dt)
    end)

    task.spawn(function()
        while win and win.Parent do
            local up = os.clock()-Kernel.boot
            local cnt=0; local mem=0
            for _,p in pairs(Kernel.procs) do cnt+=1; mem+=p.mem end

            labels.os.Text = "LuaOS 3.0.0 Aurora"
            labels.ver.Text = "3.0.0 Enhanced"
            labels.kern.Text = "Luau (Roblox Runtime)"
            labels.up.Text = string.format("%02d:%02d:%02d", math.floor(up/3600), math.floor(up%3600/60), math.floor(up%60))
            labels.procs.Text = tostring(cnt)
            labels.ram.Text = string.format("%dMB / 512MB (%d%%)", mem, math.floor(mem/512*100))
            labels.player.Text = player.DisplayName.." (@"..player.Name..")"
            labels.display.Text = player.DisplayName
            labels.game.Text = tostring(game.PlaceId)
            labels.fps.Text = tostring(fps).." FPS"

            task.wait(0.5)
        end
        conn:Disconnect()
    end)
end

-- ── DESKTOP ICONS ──────────────────────────────────────────────
local ICONS={
    {lbl="Terminal",  ico="⌨",  fn=openTerminal,    pos=UDim2.new(0,18,0,18)},
    {lbl="Notepad",   ico="📝", fn=openNotepad,     pos=UDim2.new(0,18,0,112)},
    {lbl="Tasks",     ico="📊", fn=openTaskManager,  pos=UDim2.new(0,18,0,206)},
    {lbl="Browser",   ico="🌐", fn=openBrowser,      pos=UDim2.new(0,18,0,300)},
    {lbl="Files",     ico="📁", fn=openFiles,        pos=UDim2.new(0,18,0,394)},
    {lbl="Calculator",ico="🧮",fn=openCalc,         pos=UDim2.new(0,110,0,18)},
    {lbl="Settings",  ico="⚙",  fn=openSettings,     pos=UDim2.new(0,110,0,112)},
    {lbl="Monitor",   ico="📈", fn=openSysMonitor,   pos=UDim2.new(0,110,0,206)},
}

for _,ic in ipairs(ICONS) do
    local fr=c("Frame",{
        Size=UDim2.new(0,76,0,82), Position=ic.pos,
        BackgroundColor3=T.surface, BackgroundTransparency=0.3,
        BorderSizePixel=0,ZIndex=2},desktop)
    corner(fr,10); stroke(fr,T.border,1,.4)

    c("TextLabel",{Size=UDim2.new(1,0,0,48),Position=UDim2.new(0,0,0,4),
        BackgroundTransparency=1,Text=ic.ico,
        Font=Enum.Font.GothamBold,TextSize=30,ZIndex=3},fr)

    c("TextLabel",{Size=UDim2.new(1,-4,0,26),Position=UDim2.new(0,2,0,50),
        BackgroundTransparency=1,Text=ic.lbl,
        Font=Enum.Font.Gotham,TextSize=10,TextColor3=T.text,
        TextWrapped=true,ZIndex=3},fr)

    local btn=c("TextButton",{Size=UDim2.new(1,0,1,0),BackgroundTransparency=1,
        Text="",ZIndex=4},fr)

    btn.MouseEnter:Connect(function()
        tw(fr,{BackgroundTransparency=0.1, BackgroundColor3=T.surface2})
    end)
    btn.MouseLeave:Connect(function()
        tw(fr,{BackgroundTransparency=0.3, BackgroundColor3=T.surface})
    end)
    btn.MouseButton1Click:Connect(ic.fn)
end

-- ── TASKBAR ───────────────────────────────────────────────────
local taskbar=c("Frame",{
    Size=UDim2.new(1,0,0,44), Position=UDim2.new(0,0,1,-44),
    BackgroundColor3=T.bg1, BorderSizePixel=0,ZIndex=50},gui)

c("Frame",{Size=UDim2.new(1,0,0,1),
    BackgroundColor3=T.accent,BackgroundTransparency=0.6,
    BorderSizePixel=0,ZIndex=51},taskbar)

-- Start button
local startBtn=c("TextButton",{
    Size=UDim2.new(0,90,0,32), Position=UDim2.new(0,6,0.5,-16),
    BackgroundColor3=T.accentDk, Text="⊞  START",
    TextColor3=Color3.new(1,1,1), Font=Enum.Font.GothamBold,TextSize=14,
    ZIndex=51,BorderSizePixel=0},taskbar)
corner(startBtn,6)

-- Open windows on taskbar
local taskWinArea = c("Frame",{
    Size=UDim2.new(0,500,0,32), Position=UDim2.new(0,106,0.5,-16),
    BackgroundTransparency=1, ZIndex=51},taskbar)
c("UIListLayout",{
    FillDirection=Enum.FillDirection.Horizontal,
    Padding=UDim.new(0,4),
},taskWinArea)

refreshTaskbar = function()
    for _,ch in ipairs(taskWinArea:GetChildren()) do
        if ch:IsA("TextButton") then ch:Destroy() end
    end
    for title, _ in pairs(OpenWinNames) do
        if WINS[title] and WINS[title].Parent then
            local short = title:gsub("^%s+",""):sub(1,12)
            local tb = c("TextButton",{
                Size=UDim2.new(0,90,1,0),
                BackgroundColor3=T.surface2,
                Text=short, TextColor3=T.text,
                Font=Enum.Font.Gotham, TextSize=11,
                ZIndex=52, BorderSizePixel=0,
            },taskWinArea)
            corner(tb,5)
            hover(tb, T.surface2, T.surface)
            tb.MouseButton1Click:Connect(function()
                local w = WINS[title]
                if w then w.Visible=true; Z+=1; w.ZIndex=Z end
            end)
        end
    end
end

-- Clock
local clockFrame=c("Frame",{
    Size=UDim2.new(0,90,1,0), Position=UDim2.new(1,-96,0,0),
    BackgroundTransparency=1,ZIndex=51},taskbar)

local clockMain=c("TextLabel",{
    Size=UDim2.new(1,0,0,22),Position=UDim2.new(0,0,0,4),
    BackgroundTransparency=1, Text=os.date("%H:%M"),
    Font=Enum.Font.GothamBold,TextSize=16,TextColor3=T.text,
    ZIndex=52},clockFrame)

local clockDate=c("TextLabel",{
    Size=UDim2.new(1,0,0,14),Position=UDim2.new(0,0,0,24),
    BackgroundTransparency=1, Text=os.date("%m/%d/%Y"),
    Font=Enum.Font.Gotham,TextSize=11,TextColor3=T.textDim,
    ZIndex=52},clockFrame)

task.spawn(function()
    while gui and gui.Parent do
        task.wait(1)
        clockMain.Text=os.date("%H:%M")
        clockDate.Text=os.date("%m/%d/%Y")
    end
end)

-- Logo
c("TextLabel",{
    Size=UDim2.new(0,80,1,0), Position=UDim2.new(0.5,-40,0,0),
    BackgroundTransparency=1, Text="LuaOS",
    Font=Enum.Font.GothamBold,TextSize=13,TextColor3=T.textMut,
    ZIndex=51},taskbar)

-- ── START MENU ─────────────────────────────────────────────────
local smOpen=false
local sm=c("Frame",{
    Size=UDim2.new(0,280,0,460),
    Position=UDim2.new(0,-290,1,-44),
    BackgroundColor3=T.bg2,
    BorderSizePixel=0,ZIndex=60, Visible=false},gui)
corner(sm,12); stroke(sm,T.accent,1,.4)

local smHead=c("Frame",{
    Size=UDim2.new(1,0,0,70),
    BackgroundColor3=T.accentDk,
    BorderSizePixel=0,ZIndex=61},sm)
corner(smHead,12)
c("Frame",{Size=UDim2.new(1,0,0.5,0),Position=UDim2.new(0,0,0.5,0),
    BackgroundColor3=T.accentDk,BorderSizePixel=0,ZIndex=61},smHead)

c("TextLabel",{
    Size=UDim2.new(1,-12,0,28),Position=UDim2.new(0,12,0,10),
    BackgroundTransparency=1, Text="👤  "..player.Name,
    Font=Enum.Font.GothamBold,TextSize=16,TextColor3=T.text,
    TextXAlignment=Enum.TextXAlignment.Left,ZIndex=62},smHead)

c("TextLabel",{
    Size=UDim2.new(1,-12,0,16),Position=UDim2.new(0,12,0,40),
    BackgroundTransparency=1, Text="LuaOS 3.0.0 Aurora — Enhanced Edition",
    Font=Enum.Font.Gotham,TextSize=11,TextColor3=Color3.fromRGB(160,190,255),
    TextXAlignment=Enum.TextXAlignment.Left,ZIndex=62},smHead)

local smApps={
    {ico="⌨",  lbl="Terminal",          fn=openTerminal},
    {ico="📝", lbl="Notepad",            fn=openNotepad},
    {ico="📊", lbl="Task Manager",       fn=openTaskManager},
    {ico="🌐", lbl="Browser",            fn=openBrowser},
    {ico="📁", lbl="File Manager",       fn=openFiles},
    {ico="🧮", lbl="Calculator",         fn=openCalc},
    {ico="⚙",  lbl="Settings",           fn=openSettings},
    {ico="📈", lbl="System Monitor",     fn=openSysMonitor},
}

local smList=c("Frame",{
    Size=UDim2.new(1,-12,0,300),
    Position=UDim2.new(0,6,0,76),
    BackgroundTransparency=1,ZIndex=61},sm)
c("UIListLayout",{Padding=UDim.new(0,3)},smList)

for _,app in ipairs(smApps) do
    local row=c("TextButton",{
        Size=UDim2.new(1,0,0,34),
        BackgroundColor3=T.bg2,
        Text="",BorderSizePixel=0,ZIndex=62},smList)
    corner(row,7); hover(row,T.bg2,T.surface)

    c("TextLabel",{Size=UDim2.new(0,36,1,0),Position=UDim2.new(0,8,0,0),
        BackgroundTransparency=1,Text=app.ico,
        Font=Enum.Font.GothamBold,TextSize=18,ZIndex=63},row)

    c("TextLabel",{Size=UDim2.new(1,-50,1,0),Position=UDim2.new(0,46,0,0),
        BackgroundTransparency=1,Text=app.lbl,
        Font=Enum.Font.Gotham,TextSize=13,TextColor3=T.text,
        TextXAlignment=Enum.TextXAlignment.Left,ZIndex=63},row)

    row.MouseButton1Click:Connect(function()
        smOpen=false
        tw(sm,{Position=UDim2.new(0,-290,1,-44)},.2)
        task.delay(.21,function() sm.Visible=false end)
        app.fn()
    end)
end

-- Separator
c("Frame",{Size=UDim2.new(1,-12,0,1),Position=UDim2.new(0,6,0,385),
    BackgroundColor3=T.border,BackgroundTransparency=.4,
    BorderSizePixel=0,ZIndex=61},sm)

-- Shutdown button
local shutBtn=c("TextButton",{
    Size=UDim2.new(1,-12,0,40), Position=UDim2.new(0,6,0,394),
    BackgroundColor3=Color3.fromRGB(160,30,30),
    Text="⏻   Shutdown LuaOS",
    TextColor3=Color3.new(1,1,1),
    Font=Enum.Font.GothamBold,TextSize=13,
    ZIndex=62,BorderSizePixel=0},sm)
corner(shutBtn,7)
hover(shutBtn,Color3.fromRGB(160,30,30),Color3.fromRGB(210,45,45))

shutBtn.MouseButton1Click:Connect(function()
    smOpen=false; sm.Visible=false
    local ov=c("Frame",{
        Size=UDim2.new(1,0,1,0),
        BackgroundColor3=Color3.new(0,0,0),
        BackgroundTransparency=1, ZIndex=9999},gui)
    tw(ov,{BackgroundTransparency=0},1)
    task.delay(1,function()
        c("TextLabel",{
            Size=UDim2.new(1,0,0,60),Position=UDim2.new(0,0,0.42,0),
            BackgroundTransparency=1, Text="LuaOS has shut down",
            Font=Enum.Font.GothamBold,TextSize=22,
            TextColor3=T.accent,ZIndex=10000},ov)
        c("TextLabel",{
            Size=UDim2.new(1,0,0,30),Position=UDim2.new(0,0,0.52,0),
            BackgroundTransparency=1, Text="v3.0.0 Aurora — Thanks for using!",
            Font=Enum.Font.Gotham,TextSize=14,
            TextColor3=T.textDim,ZIndex=10000},ov)
    end)
    task.delay(4,function() gui:Destroy() end)
end)

-- Start menu logic
local function toggleSM()
    smOpen=not smOpen
    if smOpen then
        sm.Visible=true
        sm.Position=UDim2.new(0,-290,1,-44)
        tw(sm,{Position=UDim2.new(0,6,1,-sm.Size.Y.Offset-44)},.22,Enum.EasingStyle.Back)
    else
        tw(sm,{Position=UDim2.new(0,-290,1,-44)},.18)
        task.delay(.2,function() sm.Visible=false end)
    end
end

startBtn.MouseButton1Click:Connect(toggleSM)
hover(startBtn, T.accentDk, T.accent)

desktop.InputBegan:Connect(function(i)
    if smOpen and i.UserInputType==Enum.UserInputType.MouseButton1 then
        smOpen=false
        tw(sm,{Position=UDim2.new(0,-290,1,-44)},.18)
        task.delay(.2,function() sm.Visible=false end)
    end
end)

-- ── BOOT SCREEN ─────────────────────────────────────────────
local boot=c("Frame",{
    Size=UDim2.new(1,0,1,0),
    BackgroundColor3=Color3.fromRGB(3,4,10),
    ZIndex=9000},gui)

local bootLogo=c("TextLabel",{
    Size=UDim2.new(1,0,0,90), Position=UDim2.new(0,0,0.35,0),
    BackgroundTransparency=1, Text="LuaOS",
    Font=Enum.Font.GothamBold,TextSize=72,
    TextColor3=T.accent,ZIndex=9001},boot)

local bootSub=c("TextLabel",{
    Size=UDim2.new(1,0,0,24), Position=UDim2.new(0,0,0.35,90),
    BackgroundTransparency=1, Text="v3.0.0 Aurora  ·  Enhanced Edition",
    Font=Enum.Font.Gotham,TextSize=16,
    TextColor3=T.textDim,ZIndex=9001},boot)

local bootVer=c("TextLabel",{
    Size=UDim2.new(1,0,0,20), Position=UDim2.new(0,0,0.35,115),
    BackgroundTransparency=1, Text="Powered by Luau Runtime",
    Font=Enum.Font.Gotham,TextSize=12,
    TextColor3=T.textMut,ZIndex=9001},boot)

local pbBg=c("Frame",{
    Size=UDim2.new(0,360,0,4), Position=UDim2.new(0.5,-180,0.72,0),
    BackgroundColor3=T.surface2, BorderSizePixel=0,ZIndex=9001},boot)
corner(pbBg,2)

local pbFill=c("Frame",{
    Size=UDim2.new(0,0,1,0),
    BackgroundColor3=T.accent,
    BorderSizePixel=0,ZIndex=9002},pbBg)
corner(pbFill,2)

local pbStatus=c("TextLabel",{
    Size=UDim2.new(0,360,0,20), Position=UDim2.new(0.5,-180,0.72,10),
    BackgroundTransparency=1, Text="Initializing...",
    Font=Enum.Font.Code,TextSize=12,
    TextColor3=T.textMut,ZIndex=9001},boot)

local steps={
    {t="Initializing kernel v3.0...",      p=0.12},
    {t="Mounting file system...",          p=0.26},
    {t="Loading theme: "..ActiveTheme.."...", p=0.38},
    {t="Starting system services...",      p=0.52},
    {t="Initializing window manager...",   p=0.64},
    {t="Starting notification system...",  p=0.76},
    {t="Authenticating "..player.Name.."...", p=0.90},
    {t="Ready! Welcome.",                  p=1.00},
}

task.spawn(function()
    for _,s in ipairs(steps) do
        pbStatus.Text=s.t
        tw(pbFill,{Size=UDim2.new(s.p,0,1,0)},.4)
        task.wait(.38)
    end
    task.wait(.3)

    local function fadeOut(obj)
        if obj:IsA("TextLabel") then tw(obj,{TextTransparency=1},.5) end
        if obj:IsA("Frame") or obj:IsA("TextLabel") then
            tw(obj,{BackgroundTransparency=1},.5)
        end
        for _,ch in ipairs(obj:GetChildren()) do fadeOut(ch) end
    end

    fadeOut(bootLogo); fadeOut(bootSub); fadeOut(bootVer)
    fadeOut(pbBg); fadeOut(pbStatus)
    task.wait(.3)
    tw(boot,{BackgroundTransparency=1},.5)
    task.wait(.55)
    boot:Destroy()

    -- Welcome notification
    task.delay(0.5, function()
        notify("Welcome!", "LuaOS v3.0 Aurora loaded.\n"..player.DisplayName..", enjoy!", 5, "👋")
    end)
end)