func (p DropdownPainter) PaintMenu(canvas widget.Canvas, st *dropdown.MenuPaintState) {
	if st.Bounds.IsEmpty() {
		return
	}

	colors := st.ColorScheme
	if colors == (dropdown.DropdownColorScheme{}) {
		colors = p.resolveColors()
	}

	// Menu background with elevation shadow (M3 surface tint).
	canvas.DrawRoundRect(st.Bounds, colors.MenuBg, m3DDMenuRadius)
	canvas.StrokeRoundRect(st.Bounds, colors.MenuBorder, m3DDMenuRadius, m3DDBorderWidth)

	// Clip to menu bounds for items.
	canvas.PushClip(st.Bounds)
	defer canvas.PopClip()

	// Draw visible items.
	endIndex := st.ScrollOffset + st.VisibleCount
	if endIndex > len(st.Items) {
		endIndex = len(st.Items)
	}

	for i := st.ScrollOffset; i < endIndex; i++ {
		item := st.Items[i]
		row := i - st.ScrollOffset
		itemRect := geometry.Rect{
			Min:	geometry.Pt(st.Bounds.Min.X, st.Bounds.Min.Y+float32(row)*st.ItemHeight),
			Max:	geometry.Pt(st.Bounds.Max.X, st.Bounds.Min.Y+float32(row+1)*st.ItemHeight),
		}

		m3DDPaintMenuItem(canvas, itemRect, item, i, st.HighlightedIndex, st.SelectedIndex, colors)
	}
}

func (p DropdownPainter) PaintTrigger(canvas widget.Canvas, st *dropdown.TriggerPaintState) {
	if st.Bounds.IsEmpty() {
		return
	}

	colors := st.ColorScheme
	if colors == (dropdown.DropdownColorScheme{}) {
		colors = p.resolveColors()
	}

	m3DDPaintTriggerBg(canvas, st, colors)
	m3DDPaintTriggerBorder(canvas, st, colors)
	m3DDPaintTriggerText(canvas, st, colors)
	m3DDPaintTriggerChevron(canvas, st, colors)

	if st.Focused && !st.Disabled {
		m3DDDrawFocusIndicator(canvas, st.Bounds, colors)
	}
}

type DropdownPainter struct {
	Theme *Theme	// nil uses default M3 purple fallback
}