func (p ToolbarPainter) PaintButtonItem(canvas widget.Canvas, state toolbar.PaintButtonState) {
	if state.Bounds.IsEmpty() {
		return
	}
	colors := p.resolveColors()

	// Background on hover/press (disabled items get no feedback).
	if !state.Disabled {
		bg := widget.ColorTransparent
		if state.Pressed {
			bg = colors.PressedBg
		} else if state.Hovered {
			bg = colors.HoverBg
		}
		if !bg.IsTransparent() {
			canvas.DrawRoundRect(state.Bounds, bg, dtToolbarItemRadius)
		}
	}

	// Icon color.
	fg := colors.IconColor
	if state.Disabled {
		fg = colors.DisabledFg
	}

	// Draw icon centered in the button area.
	iconBounds := dtToolbarIconBounds(state.Bounds, state.ShowLabel)
	icon.Draw(canvas, state.Icon, iconBounds, fg)

	// Draw label text if ShowLabel is true.
	if state.ShowLabel && state.Label != "" {
		textBounds := dtToolbarTextBounds(state.Bounds, iconBounds)
		canvas.DrawText(state.Label, textBounds, dtToolbarFontSize, fg, false, widget.TextAlignLeft)
	}

	// Focus ring (1px DevTools style).
	if state.Focused && !state.Disabled {
		canvas.StrokeRoundRect(state.Bounds, colors.FocusRing, dtToolbarItemRadius, dtToolbarFocusRingWidth)
	}
}

func (p ToolbarPainter) PaintSeparator(canvas widget.Canvas, bounds geometry.Rect) {
	if bounds.IsEmpty() {
		return
	}
	colors := p.resolveColors()
	centerX := bounds.Min.X + bounds.Width()/2
	canvas.DrawLine(
		geometry.Pt(centerX, bounds.Min.Y+dtToolbarSepInset),
		geometry.Pt(centerX, bounds.Max.Y-dtToolbarSepInset),
		colors.SeparatorFg, dtToolbarSepWidth,
	)
}

func (p ToolbarPainter) PaintToolbar(canvas widget.Canvas, state toolbar.PaintToolbarState) {
	if state.Bounds.IsEmpty() {
		return
	}
	colors := p.resolveColors()

	// Transparent background (flat DevTools style).
	if !colors.Background.IsTransparent() {
		canvas.DrawRect(state.Bounds, colors.Background)
	}

	// 1px bottom border.
	borderRect := geometry.NewRect(
		state.Bounds.Min.X,
		state.Bounds.Max.Y-dtToolbarBorderWidth,
		state.Bounds.Width(),
		dtToolbarBorderWidth,
	)
	canvas.DrawRect(borderRect, colors.BorderColor)
}

type ToolbarPainter struct {
	Theme *Theme	// nil uses default DevTools dark fallback
}