```
module Main exposing (..)

import Browser
import Html exposing (Html, div, text)
import Html.Attributes exposing (style)
import Html.Events
import Json.Decode as D
import Dict exposing (Dict)
import Time
import Task

-- TYPES (No recursive aliases)
type Model
    = Model 
        { elements : Dict String UIElement
        , camera : Camera
        , debug : String
        }

type UIElement
    = UIElement
        { id : String
        , position : ( Float, Float )
        , size : ( Float, Float )
        , constraints : List Constraint
        , state : ElementState
        }

type Constraint
    = Constraint
        { condition : Model -> UIElement -> Bool
        , onViolation : Model -> UIElement -> ( Model, Cmd Msg )
        }

type ElementState
    = Normal
    | Hovered
    | Pressed
    | Disabled

type alias Camera =
    { viewport : ( Float, Float )
    , zoom : Float
    , target : ( Float, Float )
    }

-- MSG
type Msg
    = Tick Time.Posix
    | MouseMove ( Float, Float )
    | MouseDown String
    | NoOp

-- UPDATE
update : Msg -> Model -> ( Model, Cmd Msg )
update msg (Model model) =
    case msg of
        Tick _ ->
            ( Model model, Cmd.none )

        MouseMove ( x, y ) ->
            let
                updatedElements =
                    Dict.map (updateHoverState ( x, y )) model.elements
            in
            ( Model { model | elements = updatedElements }
            , Cmd.none
            )

        MouseDown elementId ->
            case Dict.get elementId model.elements of
                Just (UIElement element) ->
                    let
                        updated = UIElement { element | state = Pressed }
                    in
                    ( Model { model | elements = Dict.insert elementId updated model.elements }
                    , Cmd.none
                    )

                Nothing ->
                    ( Model model, Cmd.none )

        NoOp ->
            ( Model model, Cmd.none )

-- Correct stepped range implementation
steppedRange : Float -> Float -> Float -> List Float
steppedRange start step end =
    if start > end then
        []
    else
        start :: steppedRange (start + step) step end

findNonOverlappingPosition : Model -> UIElement -> ( Float, Float )
findNonOverlappingPosition (Model model) (UIElement elem) =
    let
        ( x, y ) = elem.position
        candidates = steppedRange y 10 100 |> List.map (\dy -> ( x, dy ))
    in
    case List.find (\pos ->
            Dict.all (\_ (UIElement other) ->
                elem.id == other.id || not (checkOverlap { elem | position = pos } other)
            model.elements
        ) candidates of
        Just validPos -> validPos
        Nothing -> ( x, y + 120 )

-- VIEW
view : Model -> Html Msg
view (Model model) =
    let
        ( vw, vh ) = model.camera.viewport
        aspectRatio = vw / vh
    in
    div
        [ style "width" "100vw"
        , style "height" "100vh"
        , style "position" "relative"
        ]
        [ div
            [ style "position" "absolute"
            , style "left" "0"
            , style "top" "0"
            ]
            (Dict.values (Dict.map (viewElement aspectRatio) model.elements))
        , div [ style "position" "fixed", style "bottom" "0" ]
            [ text model.debug ]
        ]

viewElement : Float -> String -> UIElement -> Html Msg
viewElement aspectRatio _ (UIElement elem) =
    let
        ( x, y ) = elem.position
        ( w, h ) = elem.size
        scaledX = x * (1 / aspectRatio)
    in
    div
        [ style "position" "absolute"
        , style "left" (String.fromFloat scaledX ++ "px")
        , style "top" (String.fromFloat y ++ "px")
        , style "width" (String.fromFloat w ++ "px")
        , style "height" (String.fromFloat h ++ "px")
        , style "background" (elementColor elem.state)
        , style "border" "1px solid black"
        , Html.Events.on "mousedown" (D.succeed (MouseDown elem.id))
        ]
        []

-- HELPER FUNCTIONS
updateHoverState : ( Float, Float ) -> String -> UIElement -> UIElement
updateHoverState ( mouseX, mouseY ) _ (UIElement elem) =
    let
        ( x, y ) = elem.position
        ( w, h ) = elem.size
        isHovered = mouseX >= x && mouseX <= x + w && mouseY >= y && mouseY <= y + h
    in
    UIElement { elem | state = 
        if isHovered then
            case elem.state of
                Pressed -> Pressed
                _ -> Hovered
        else
            case elem.state of
                Pressed -> Pressed
                _ -> Normal
    }

elementColor : ElementState -> String
elementColor state =
    case state of
        Normal -> "lightblue"
        Hovered -> "blue"
        Pressed -> "darkblue"
        Disabled -> "gray"

checkOverlap : UIElement -> UIElement -> Bool
checkOverlap (UIElement a) (UIElement b) =
    let
        ( ax1, ay1 ) = a.position
        ( aw, ah ) = a.size
        ( bx1, by1 ) = b.position
        ( bw, bh ) = b.size
    in
    ax1 < bx1 + bw && ax1 + aw > bx1 && ay1 < by1 + bh && ay1 + ah > by1

-- INIT
init : () -> ( Model, Cmd Msg )
init _ =
    let
        initialModel =
            Model
                { elements = Dict.fromList
                    [ ( "btn1"
                      , UIElement
                            { id = "btn1"
                            , position = ( 50, 50 )
                            , size = ( 100, 40 )
                            , constraints = []
                            , state = Normal
                            }
                      )
                    , ( "btn2"
                      , UIElement
                            { id = "btn2"
                            , position = ( 50, 100 )
                            , size = ( 100, 40 )
                            , constraints = []
                            , state = Normal
                            }
                      )
                    ]
                , camera = { viewport = ( 1024, 768 ), zoom = 1.0, target = ( 0, 0 ) }
                , debug = "Initialized"
                }
    in
    ( initialModel, Cmd.none )

-- SUBSCRIPTIONS
subscriptions : Model -> Sub Msg
subscriptions (Model _) =
    Sub.batch
        [ Time.every 1000 (\_ -> Tick (Time.millisToPosix 0))
        , Browser.Events.onMouseMove (D.map MouseMove decodeMousePos)
        ]

decodeMousePos : D.Decoder ( Float, Float )
decodeMousePos =
    D.map2 Tuple.pair
        (D.field "clientX" D.float)
        (D.field "clientY" D.float)

-- MAIN
main =
    Browser.element
        { init = init
        , view = view
        , update = update
        , subscriptions = subscriptions
        }
```

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