diff --git a/button.go b/button.go
index 83cfa26..d3c2e2f 100644
--- a/button.go
+++ b/button.go
@@ -29,6 +29,9 @@ type ButtonOptions struct {
 	Label string
 }
 
+// buttonSpinnerSize is the leading icon slot, which the spinner takes while loading.
+const buttonSpinnerSize float32 = 16
+
 // Button is a push button. Loading keeps its size and blocks clicks.
 func Button(c *ui.Context, label string, opts ButtonOptions) *ui.Element {
 	if label == "" && opts.Label == "" {
@@ -36,8 +39,13 @@ func Button(c *ui.Context, label string, opts ButtonOptions) *ui.Element {
 	}
 	k := Tokens(c)
 	d := Density(c)
+	pad, gap := d.Unit()*4, d.Unit()*2
+	if opts.Loading && opts.Icon == nil && label != "" {
+		// The spinner slot comes out of the padding, so the width holds.
+		pad -= (buttonSpinnerSize + gap) / 2
+	}
 	b := ui.ButtonBase(c).MinHeight(d.ControlHeight()).MinWidth(theme.MinHitSize).
-		Padding(0, d.Unit()*4).Gap(d.Unit() * 2).Radius(theme.ControlRadius).
+		Padding(0, pad).Gap(gap).Radius(theme.ControlRadius).
 		Disabled(opts.Disabled || opts.Loading)
 	internal.Ring(b, k.Focus, theme.ControlRadius)
 	if opts.Label != "" {
@@ -49,25 +57,13 @@ func Button(c *ui.Context, label string, opts ButtonOptions) *ui.Element {
 		b.Border(theme.BorderWidth, border)
 	}
 	b.Children(func() {
-		switch {
-		case opts.Loading && opts.Icon != nil:
-			// The spinner takes the icon's 16 DIP slot.
-			Spinner(c, SpinnerOptions{Size: 16, Color: fg})
-		case opts.Loading && label == "":
-			Spinner(c, SpinnerOptions{Size: 16, Color: fg})
-		case opts.Loading:
-			// Over the hidden label, so the width stays.
-			ui.Box(c).Absolute().Left(0).Top(0).Right(0).Bottom(0).Center().Children(func() {
-				Spinner(c, SpinnerOptions{Size: 16, Color: fg})
-			})
-		case opts.Icon != nil:
-			ui.Icon(c, opts.Icon).Size(16, 16)
+		if opts.Loading {
+			Spinner(c, SpinnerOptions{Size: buttonSpinnerSize, Color: fg})
+		} else if opts.Icon != nil {
+			ui.Icon(c, opts.Icon).Size(buttonSpinnerSize, buttonSpinnerSize)
 		}
 		if label != "" {
-			t := ui.Text(c, label).SingleLine()
-			if opts.Loading && opts.Icon == nil {
-				t.TextColor(fg.Alpha(0))
-			}
+			ui.Text(c, label).SingleLine()
 		}
 	})
 	return b
diff --git a/checkbox.go b/checkbox.go
index c294aea..5a420ee 100644
--- a/checkbox.go
+++ b/checkbox.go
@@ -32,7 +32,7 @@ func Checkbox(c *ui.Context, value *bool, label string, opts CheckboxOptions) *u
 	wrap.Children(func() {
 		row = ui.CheckboxBase(c, value).Gap(d.Unit() * 2).MinHeight(d.ControlHeight()).FocusRing(false)
 	})
-	if opts.Disabled && wrap.FocusWithin() {
+	if wrap.IsDisabled() && wrap.FocusWithin() {
 		wrap.FocusRing(false).Focus()
 	}
 	if row.Changed() && opts.Indeterminate && !*value {
diff --git a/docs/components/021-button.md b/docs/components/021-button.md
index ec90fe8..e22d459 100644
--- a/docs/components/021-button.md
+++ b/docs/components/021-button.md
@@ -21,7 +21,7 @@ if mujica.Button(c, "Save", mujica.ButtonOptions{Icon: icons.Must("check")}).Cli
 | `label` | `string` | 必填（仅图标时可为空） | 按钮文字；为空时必须提供 `Label`，否则 panic。 |
 | `Variant` | `ButtonVariant` | `Primary` | `Primary`、`Secondary`、`Outline`、`Ghost`、`Danger`。 |
 | `Icon` | `*ui.SVG` | `nil` | 文字前的 16 DIP 图标。 |
-| `Loading` | `bool` | `false` | 有图标时加载标记占用图标位置；纯文字时标记居中覆盖在隐藏的文字上，宽度不变；阻止点击。 |
+| `Loading` | `bool` | `false` | 加载标记出现在前置 16 DIP 图标位置，文字保持可见；有图标时替换图标，纯文字时从左右内边距中让出该位置，宽度不变；阻止点击。 |
 | `Disabled` | `bool` | `false` | 不可点击、不进入 Tab 序列。 |
 | `Label` | `string` | `""` | 无障碍名称；`label` 为空时必填。 |
 
diff --git a/docs/components/024-text-input.md b/docs/components/024-text-input.md
index d363468..32d4e5f 100644
--- a/docs/components/024-text-input.md
+++ b/docs/components/024-text-input.md
@@ -32,7 +32,7 @@ if r.Submitted() {
 
 ## 状态
 
-默认（Surface 底、ControlBorder 边）、悬停（边框加深）、聚焦（边框 Focus 色；键盘聚焦另加焦点环）、只读（Background 底、Border 边）、错误、禁用。聚焦时被禁用会放弃焦点，已排队的按键不再修改值、不触发事件。颜色变化 120 毫秒过渡，减少动画时直接切换。
+默认（Surface 底、ControlBorder 边）、悬停（边框加深）、聚焦（边框 Focus 色；键盘聚焦另加焦点环）、只读（Background 底、Border 边）、错误、禁用。禁用来自自身或任一祖先容器；聚焦时被禁用会放弃焦点，已排队的按键不再修改值、不触发事件。颜色变化 120 毫秒过渡，减少动画时直接切换。
 
 ## 事件
 
@@ -41,9 +41,10 @@ if r.Submitted() {
 
 ## 键盘操作
 
-Tab 聚焦（全选内容）；Enter 提交；Escape 清空（仅 `Clearable` 且有内容时，否则交给外层）；Cmd/Ctrl+Z、Shift+Cmd+Z 撤销重做；Cmd/Ctrl+A/C/X/V；输入法组合期间不提交。
+Tab 聚焦（全选内容）；Enter 提交；Escape 清空（仅 `Clearable` 且有内容时，否则交给外层）；Cmd/Ctrl+Z、Shift+Cmd+Z 撤销重做；Cmd/Ctrl+A/C/X/V；组合中的文本不会写入值。
 
 ## 限制
 
+- 输入法组合期间无法阻止 Enter 提交：MyGo 不公开组合状态，组合文本存在未导出的 `editor.compose`（`ui/editor.go:73`），带编辑器的元素收不到 `InputCompose` 事件（`ui/input.go:689`）。公开接口也无法间接得知：`Element.TextCaret`（`ui/handler.go:82`）只是自绘控件声明输入位置的设置方法，`Tester.TextCaret` 返回的 `Active`（`ui/headless.go:370-373`）只表示可编辑元素持有键盘，不表示正在组合。各平台输入法在组合时通常自己消费 Enter。
 - MyGo 没有公开的只读输入接口（只读模式仅用于 `Text.Selectable`，`editor.go:77`）。`ReadOnly` 通过让编辑器编辑一个副本并在同帧还原实现，撤销栈里可能出现被还原的步骤。
 - 清空按钮不进入 Tab 序列（与 MyGo SearchField 相同），键盘用 Escape 清空。
diff --git a/docs/components/025-text-area.md b/docs/components/025-text-area.md
index c4f1b51..1204c78 100644
--- a/docs/components/025-text-area.md
+++ b/docs/components/025-text-area.md
@@ -45,5 +45,5 @@ if r.Submitted() {
 ## 限制
 
 - `MaxLength` 只提示，不截断输入，以免打断输入法组合与粘贴。
-- 输入法组合期间无法阻止提交快捷键：MyGo 不公开组合状态，组合文本存在未导出的 `editor.compose`（`ui/editor.go:73`），带编辑器的元素收不到 `InputCompose` 事件（`ui/input.go:689`）。各平台输入法在组合时通常自己消费 Enter；只有未被输入法消费的按键会触发提交。
+- 输入法组合期间无法阻止提交快捷键：MyGo 不公开组合状态，组合文本存在未导出的 `editor.compose`（`ui/editor.go:73`），带编辑器的元素收不到 `InputCompose` 事件（`ui/input.go:689`）。各平台输入法在组合时通常自己消费 Enter；只有未被输入法消费的按键会触发提交。公开接口也无法间接得知：`Element.TextCaret`（`ui/handler.go:82`）只是自绘控件声明输入位置的设置方法，`Tester.TextCaret` 返回的 `Active`（`ui/headless.go:370-373`）只表示可编辑元素持有键盘，不表示正在组合。
 - 只读实现方式同 TextInput。
diff --git a/docs/components/026-number-input.md b/docs/components/026-number-input.md
index 2c67ff0..17e1ec3 100644
--- a/docs/components/026-number-input.md
+++ b/docs/components/026-number-input.md
@@ -2,7 +2,7 @@
 
 ## 用途
 
-输入与步进数值，支持范围、步长、精度与空值。合并 MyGo 的 Number input（输入模式）与 Stepper（`StepperOnly` 仅步进模式）。
+输入与步进数值，支持范围、步长、精度与空值。合并 MyGo 的 Number input（输入模式）与 Stepper（`StepperOnly` 仅步进模式）；两种模式的步进计算都由组件完成。
 
 ## 最小示例
 
@@ -26,7 +26,7 @@ if mujica.NumberInput(c, &copies, mujica.NumberInputOptions{Min: 1, Max: 99, Lab
 | `StepperOnly` | `bool` | `false` | 只显示数值与上下箭头，不可输入；必须给出 `Min < Max`，且不能与 `AllowEmpty` 同用。 |
 | `Placeholder` | `string` | `""` | 空值时的占位。 |
 | `Label` | `string` | `""` | 无障碍名称。 |
-| `Disabled` | `bool` | `false` | 禁用。 |
+| `Disabled` | `bool` | `false` | 禁用；任一祖先容器禁用时同样生效。 |
 | `Error` | `string` | `""` | 调用方给出的错误。 |
 
 ## 状态
@@ -39,11 +39,13 @@ if mujica.NumberInput(c, &copies, mujica.NumberInputOptions{Min: 1, Max: 99, Lab
 
 ## 键盘操作
 
-输入模式：Up/Down 按步长增减。仅步进模式：Up/Right 增加、Down/Left 减少、Home 到最小、End 到最大；按住箭头持续步进。
+步进沿以 `Min`（无界时为 0）为起点、`Step` 为间隔的网格移动，结果按精度取整，并停在范围内（范围先向内取到精度上，如 `Max` 0.29999999、步长 0.1 时最大值为 0.2）。不在网格上的值先吸附到相邻网格点。
+
+输入模式：Up/Down 按步长增减。仅步进模式：Up/Right 增加、Down/Left 减少、Home 到 `Min`、End 到 `Max`（如 [0, 10] 步长 3 时 End 为 10，再 Down 为 9）。
 
 ## 限制
 
 - 输入模式下的加减按钮不进入 Tab 序列，键盘用 Up/Down。
-- 仅步进模式复用 MyGo `ui.Stepper`，箭头高度来自主题间距，不随密度的控件高度变化。
-- MyGo `ui.Stepper` 的箭头不检查禁用（`indicators.go:216`），禁用时组件向它传入副本，保证值不被修改。
-- MyGo 的步进器吸附依赖有限边界（`widgets.go` 中 `snap`），所以仅步进模式要求有界。
+- 仅步进模式不使用 MyGo `ui.Stepper`：它的箭头不检查禁用（`ui/indicators.go:216`），吸附固定按 9 位小数取整（`ui/widgets.go` 中 `snap`），步长 1e-10 时无法前进。组件自绘箭头并自行计算；按住箭头不会连续步进，需重复点击或使用方向键。
+- 仅步进模式要求有界，以便 Home/End 有目标值。
+- 仅步进模式的值通过无障碍描述朗读，MyGo 未公开为自定义元素设置数值范围的接口。
diff --git a/docs/components/028-search-input.md b/docs/components/028-search-input.md
index afec587..c1d6ca8 100644
--- a/docs/components/028-search-input.md
+++ b/docs/components/028-search-input.md
@@ -48,5 +48,5 @@ if r.Moved() {
 ## 限制
 
 - MyGo 单行编辑器把 Shift+Enter 当作普通提交且不公开修饰键（`editor.go:489`，`submitMods` 未导出），组件用 `HandleInput` 先截获 Shift+Enter。
-- 输入法组合期间无法阻止提交与匹配跳转：MyGo 不公开组合状态，组合文本存在未导出的 `editor.compose`（`ui/editor.go:73`），带编辑器的元素收不到 `InputCompose` 事件（`ui/input.go:689`）。各平台输入法在组合时通常自己消费 Enter；只有未被输入法消费的按键会触发提交或跳转。
+- 输入法组合期间无法阻止提交与匹配跳转：MyGo 不公开组合状态，组合文本存在未导出的 `editor.compose`（`ui/editor.go:73`），带编辑器的元素收不到 `InputCompose` 事件（`ui/input.go:689`）。各平台输入法在组合时通常自己消费 Enter；只有未被输入法消费的按键会触发提交或跳转。公开接口也无法间接得知：`Element.TextCaret`（`ui/handler.go:82`）只是自绘控件声明输入位置的设置方法，`Tester.TextCaret` 返回的 `Active`（`ui/headless.go:370-373`）只表示可编辑元素持有键盘，不表示正在组合。
 - 没有“完成/关闭”按钮；是否显示查找栏由调用方决定。
diff --git a/docs/components/030-radio-group.md b/docs/components/030-radio-group.md
index 85e7886..3f6c9b7 100644
--- a/docs/components/030-radio-group.md
+++ b/docs/components/030-radio-group.md
@@ -49,6 +49,6 @@ Tab 进入组并落在已选项；Up/Down/Left/Right 移动并直接选择，循
 
 ## 限制
 
-- 每个选项以 `Value` 为键，选项重新排序后焦点仍跟随原来的值。
+- 每个选项按 `Value` 相等性取得稳定键（首次出现的序号），选项重新排序后焦点仍跟随原来的值；组件记住见过的值，长期不断变化的选项集合会让这份记录增长。
 
 - 方向键对横向与纵向组都同时响应上下左右（MyGo `RadioGroup` 固定使用 `Horizontal|Vertical`）。
diff --git a/input_review2_test.go b/input_review2_test.go
new file mode 100644
index 0000000..4544940
--- /dev/null
+++ b/input_review2_test.go
@@ -0,0 +1,177 @@
+package mujica
+
+import (
+	"image/color"
+	"runtime"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/icons"
+	"mujicaui/theme"
+)
+
+func TestInputsObeyDisabledAncestor(t *testing.T) {
+	text, area, num, find, cur := "", "", 5.0, "a", 0
+	off, events := false, 0
+	tt := ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		ui.Column(c).Gap(8).Disabled(off).Children(func() {
+			for _, r := range []InputResult{
+				TextInput(c, &text, TextInputOptions{Label: "Text"}),
+				TextArea(c, &area, TextAreaOptions{Label: "Area", SubmitKey: ui.KeyEnter}),
+				NumberInput(c, &num, NumberInputOptions{Label: "Num"}),
+			} {
+				if r.Changed() || r.Submitted() {
+					events++
+				}
+			}
+			if SearchInput(c, &find, SearchInputOptions{Label: "Find", Find: true, Matches: 3, Current: &cur}).Moved() {
+				events++
+			}
+		})
+	}, 400, 500)
+	next := func() {
+		if runtime.GOOS == "darwin" {
+			tt.Key(ui.Cmd, ui.KeyG)
+		} else {
+			tt.Key(0, ui.KeyF3)
+		}
+	}
+	for _, name := range []string{"Text", "Area", "Num"} {
+		_ = tt.Click(name)
+		events = 0
+		off = true
+		tt.Type("x")
+		tt.Key(0, ui.KeyEnter)
+		tt.Key(0, ui.KeyUp)
+		next()
+		if events != 0 {
+			t.Errorf("%s: %d events under a disabled ancestor", name, events)
+		}
+		off = false
+		tt.Frame()
+	}
+	if text != "" || area != "" || num != 5 || cur != 0 {
+		t.Fatalf("values changed: %q %q %v current %d", text, area, num, cur)
+	}
+}
+
+// buttonLabelInk counts pixels in the label's box that differ from its first pixel.
+func buttonLabelInk(tt *ui.Tester, label string) int {
+	r, _ := tt.Find(label)
+	img := tt.Image()
+	bg := img.At(int(r.X), int(r.Y))
+	n := 0
+	for y := int(r.Y); y < int(r.Y+r.H); y++ {
+		for x := int(r.X); x < int(r.X+r.W); x++ {
+			if !sameColor(img.At(x, y), bg) {
+				n++
+			}
+		}
+	}
+	return n
+}
+
+func sameColor(a, b color.Color) bool {
+	r1, g1, b1, a1 := a.RGBA()
+	r2, g2, b2, a2 := b.RGBA()
+	return r1 == r2 && g1 == g2 && b1 == b2 && a1 == a2
+}
+
+func TestButtonLoadingKeepsLabelAndWidth(t *testing.T) {
+	for _, d := range []theme.Density{theme.Compact, theme.Default, theme.Comfortable} {
+		for _, icon := range []*ui.SVG{nil, icons.Must("check")} {
+			loading := false
+			var w float32
+			tt := ui.NewTester(func(c *ui.Context) {
+				Use(c, Settings{Density: d})
+				ui.Row(c).Children(func() {
+					w = Button(c, "Save", ButtonOptions{Icon: icon, Loading: loading}).Bounds().W
+				})
+			}, 300, 200)
+			tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: 1})
+			tt.Frame()
+			before := w
+			loading = true
+			tt.Frame()
+			tt.Frame()
+			if w != before {
+				t.Errorf("%v icon %v: width %v -> %v", d, icon != nil, before, w)
+			}
+			// The spinner sits beside the label, never over it, and the label has ink.
+			sp, _ := tt.Find("Loading")
+			lb, _ := tt.Find("Save")
+			if sp.X+sp.W > lb.X || buttonLabelInk(tt, "Save") == 0 {
+				t.Errorf("%v icon %v: label hidden while loading (spinner %v, label %v)", d, icon != nil, sp, lb)
+			}
+		}
+	}
+}
+
+func numberInputStepTester(v *float64, opts NumberInputOptions) *ui.Tester {
+	tt := ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		NumberInput(c, v, opts)
+	}, 400, 200)
+	tt.Key(0, ui.KeyTab)
+	return tt
+}
+
+func TestNumberInputStepGrid(t *testing.T) {
+	for _, stepper := range []bool{false, true} {
+		v := 0.2
+		tt := numberInputStepTester(&v, NumberInputOptions{Min: 0, Max: 0.29999999, Step: 0.1, StepperOnly: stepper})
+		tt.Key(0, ui.KeyUp)
+		if v != 0.2 {
+			t.Errorf("stepper %v: Up past Max 0.29999999 gave %v", stepper, v)
+		}
+		v = 0
+		tt = numberInputStepTester(&v, NumberInputOptions{Min: -1, Max: 1, Step: 1e-10, StepperOnly: stepper})
+		tt.Key(0, ui.KeyUp)
+		if v != 1e-10 {
+			t.Errorf("stepper %v: Up by 1e-10 from 0 gave %v", stepper, v)
+		}
+	}
+	v := 0.0
+	tt := numberInputStepTester(&v, NumberInputOptions{Min: 0, Max: 10, Step: 3, StepperOnly: true})
+	var got []float64
+	for _, k := range []ui.Key{ui.KeyUp, ui.KeyEnd, ui.KeyDown, ui.KeyHome, ui.KeyDown} {
+		tt.Key(0, k)
+		got = append(got, v)
+	}
+	want := []float64{3, 10, 9, 0, 0}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("stepper [0,10] by 3: got %v, want %v", got, want)
+		}
+	}
+}
+
+// radioSameName prints the same for every value, as fmt keys would see it.
+type radioSameName struct{ id int }
+
+func (radioSameName) String() string { return "same" }
+
+func TestRadioGroupKeysByEquality(t *testing.T) {
+	v := radioSameName{0}
+	items := []RadioItem[radioSameName]{{Value: radioSameName{1}, Label: "One"}, {Value: radioSameName{2}, Label: "Two"}}
+	tt := ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		RadioGroup(c, &v, items, RadioGroupOptions{})
+	}, 300, 200)
+	_ = tt.Click("Two")
+	if v.id != 2 {
+		t.Fatalf("click chose %v", v)
+	}
+	tt.Key(0, ui.KeyUp)
+	if v.id != 1 {
+		t.Fatalf("Up chose %v", v)
+	}
+	items[0], items[1] = items[1], items[0]
+	tt.Frame()
+	tt.Key(0, ui.KeySpace)
+	if v.id != 1 || !tt.Focused("One") {
+		t.Fatalf("after reorder chose %v, One focused %v", v, tt.Focused("One"))
+	}
+}
diff --git a/number_input.go b/number_input.go
index efed56a..d3d3d1d 100644
--- a/number_input.go
+++ b/number_input.go
@@ -50,9 +50,34 @@ func (s numberInputSpec) format(v float64) string {
 // clamp rounds v to the precision, then bounds it; the bounds sit on that grid.
 func (s numberInputSpec) clamp(v float64) float64 {
 	p := math.Pow(10, float64(s.decimals))
-	return math.Max(s.lo, math.Min(s.hi, math.Round(v*p)/p))
+	return math.Max(s.lo, math.Min(s.hi, math.Round(v*p)/p)) + 0 // + 0 turns -0 into 0
 }
 
+// stepBy moves v n steps along the grid of Step from Min, stopping at the bounds.
+func (s numberInputSpec) stepBy(v float64, n int) float64 {
+	if math.IsNaN(v) {
+		// From empty, the first step lands next to zero.
+		v = s.clamp(0)
+	}
+	base := s.lo
+	if math.IsInf(base, 0) {
+		base = 0
+	}
+	k := (v - base) / s.step
+	if n > 0 {
+		k = numberInputFloor(k) + float64(n)
+	} else {
+		k = numberInputCeil(k) + float64(n)
+	}
+	return s.clamp(base + k*s.step)
+}
+
+// numberInputFloor floors x, forgiving floating-point error just below an integer.
+func numberInputFloor(x float64) float64 { return math.Floor(x + math.Max(1e-9, 1e-12*math.Abs(x))) }
+
+// numberInputCeil ceils x, forgiving floating-point error just above an integer.
+func numberInputCeil(x float64) float64 { return math.Ceil(x - math.Max(1e-9, 1e-12*math.Abs(x))) }
+
 // numberInputSame reports equal values, counting NaN (empty) as equal.
 func numberInputSame(a, b float64) bool { return a == b || math.IsNaN(a) && math.IsNaN(b) }
 
@@ -80,8 +105,8 @@ func numberInputResolve(opts NumberInputOptions) numberInputSpec {
 	}
 	// Bounds move inward onto the precision grid, so clamped values keep both.
 	p := math.Pow(10, float64(s.decimals))
-	s.lo = math.Ceil(math.Round(s.lo*p*1e6)/1e6) / p
-	s.hi = math.Floor(math.Round(s.hi*p*1e6)/1e6) / p
+	s.lo = numberInputCeil(s.lo*p)/p + 0 // + 0 turns -0 into 0
+	s.hi = numberInputFloor(s.hi*p)/p + 0
 	if s.lo > s.hi {
 		panic("mujica: NumberInput has no value in range at this precision")
 	}
@@ -113,13 +138,7 @@ func NumberInput(c *ui.Context, value *float64, opts NumberInputOptions) InputRe
 			r.changed = true
 		}
 	}
-	stepBy := func(n float64) {
-		base := *value
-		if math.IsNaN(base) {
-			base = math.Max(s.lo, math.Min(s.hi, 0))
-		}
-		set(base + n*s.step)
-	}
+	stepBy := func(n int) { set(s.stepBy(*value, n)) }
 	look := &textInputLook{disabled: opts.Disabled, err: opts.Error}
 	r.Element, r.Input = textInputFrame(c, look, func(frame *ui.Element) *ui.Element {
 		text := ui.Local(frame, "text", func() string { return s.format(*value) })
@@ -129,13 +148,13 @@ func NumberInput(c *ui.Context, value *float64, opts NumberInputOptions) InputRe
 			// Set from outside: the text follows, and a typing error goes.
 			*text, *invalid = s.format(*value), ""
 		}
-		in := textInputEditor(c, frame, text, opts.Disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 12).
+		in := textInputEditor(c, frame, text, look.disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 12).
 			Placeholder(opts.Placeholder).Label(opts.Label)
-		if in.Changed() && !opts.Disabled {
+		if in.Changed() && !look.disabled {
 			*invalid = numberInputParse(c, s, *text, opts.AllowEmpty, set)
 		}
 		switch {
-		case opts.Disabled:
+		case look.disabled:
 		case in.Shortcut(0, ui.KeyUp):
 			stepBy(1)
 			*text, *invalid = s.format(*value), ""
@@ -151,7 +170,7 @@ func NumberInput(c *ui.Context, value *float64, opts NumberInputOptions) InputRe
 		for _, b := range []struct {
 			name  string
 			icon  string
-			delta float64
+			delta int
 			can   bool
 		}{
 			{msg(c, "number_input.decrease"), "minus", -1, math.IsNaN(*value) || *value > s.lo},
@@ -209,37 +228,78 @@ func numberInputButton(c *ui.Context, icon, name string, can bool) bool {
 	return b.Clicked()
 }
 
-// numberInputStepper shows the value beside MyGo's stepper, restyled.
+// numberInputStepper shows the value beside up and down arrows; it steps itself.
 func numberInputStepper(c *ui.Context, value *float64, s numberInputSpec, opts NumberInputOptions) InputResult {
 	k := Tokens(c)
 	d := Density(c)
 	var r InputResult
 	r.Element = ui.Column(c).Gap(d.Unit()).Shrink(0).Disabled(opts.Disabled)
+	disabled := r.Element.IsDisabled()
+	set := func(v float64) {
+		if v != *value && !disabled {
+			*value = v
+			r.changed = true
+		}
+	}
 	r.Element.Children(func() {
 		ui.Row(c).Gap(d.Unit() * 2).MinHeight(d.ControlHeight()).Children(func() {
 			ui.Text(c, s.format(*value)).FontFeatures("tnum").MinWidth(d.Unit() * 8).TextAlign(ui.End)
-			// MyGo's stepper arrows ignore Disabled: give them a copy.
-			target := value
-			if opts.Disabled {
-				held := *value
-				target = &held
-			}
-			st := ui.Stepper(c, target, s.lo, s.hi, s.step).Label(opts.Label).Width(d.Unit()*6).
-				Radius(theme.ControlRadius).Background(k.Surface).Border(theme.BorderWidth, k.ControlBorder)
+			border := k.ControlBorder
 			if opts.Error != "" {
-				st.Error(opts.Error).Border(theme.BorderWidth, k.Danger)
+				border = k.Danger
 			}
+			st := ui.Column(c).Focusable().Shrink(0).Width(d.Unit()*6).Radius(theme.ControlRadius).Clip().
+				Background(k.Surface).Border(theme.BorderWidth, border).Role(ui.RoleStepper).Label(opts.Label).
+				Description(s.format(*value)).Error(opts.Error)
 			internal.Ring(st, k.Focus, theme.ControlRadius)
+			switch {
+			case st.Shortcut(0, ui.KeyUp), st.Shortcut(0, ui.KeyRight):
+				set(s.stepBy(*value, 1))
+			case st.Shortcut(0, ui.KeyDown), st.Shortcut(0, ui.KeyLeft):
+				set(s.stepBy(*value, -1))
+			case st.Shortcut(0, ui.KeyHome):
+				set(s.lo)
+			case st.Shortcut(0, ui.KeyEnd):
+				set(s.hi)
+			}
+			st.Children(func() {
+				if numberInputArrow(c, "chevron-up", *value < s.hi, false) {
+					set(s.stepBy(*value, 1))
+					st.Focus()
+				}
+				if numberInputArrow(c, "chevron-down", *value > s.lo, true) {
+					set(s.stepBy(*value, -1))
+					st.Focus()
+				}
+			})
 			r.Input = st
-			r.changed = st.Changed() && !opts.Disabled
 		})
 		if opts.Error != "" {
-			ui.Text(c, opts.Error).TextColor(k.Danger).FontSize(theme.CaptionSize)
+			ui.Text(c, opts.Error).TextColor(k.Danger).FontSize(FontSize(c, theme.CaptionSize))
 		}
 	})
 	if r.changed {
-		*value = s.clamp(*value)
 		slog.Debug("mujica: number_input step", "value", *value)
 	}
 	return r
 }
+
+// numberInputArrow builds one half of the stepper and reports a click.
+func numberInputArrow(c *ui.Context, icon string, can, lower bool) bool {
+	k := Tokens(c)
+	h := Density(c).ControlHeight()/2 - theme.BorderWidth
+	a := ui.Box(c).Height(h).Center().Role(ui.RoleNone).Cursor(ui.CursorPointer).Disabled(!can)
+	if lower {
+		a.BorderWidth(theme.BorderWidth, 0, 0, 0).BorderColor(k.Border)
+	}
+	fg := k.TextMuted
+	if a.Pressed() {
+		a.Background(k.Selection)
+		fg = k.Text
+	} else if a.Hovered() {
+		a.Background(k.SurfaceHover)
+		fg = k.Text
+	}
+	a.Children(func() { ui.Icon(c, icons.Must(icon)).Size(12, 12).TextColor(fg) })
+	return a.Clicked()
+}
diff --git a/password_input.go b/password_input.go
index 4c025c1..f71816c 100644
--- a/password_input.go
+++ b/password_input.go
@@ -36,14 +36,14 @@ func PasswordInput(c *ui.Context, value *string, opts PasswordInputOptions) Inpu
 			mode = "shown"
 		}
 		ui.Row(c).Key(mode).Grow(1).Children(func() {
-			in = textInputEditor(c, frame, value, opts.Disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).
+			in = textInputEditor(c, frame, value, look.disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).
 				Placeholder(opts.Placeholder).Label(opts.Label)
 			if !*shown {
 				in.Password()
 			}
 		})
-		r.changed = in.Changed() && !opts.Disabled
-		r.submitted = in.Submitted() && !opts.Disabled
+		r.changed = in.Changed() && !look.disabled
+		r.submitted = in.Submitted() && !look.disabled
 		if passwordInputToggle(c, *shown) {
 			*shown = !*shown
 			slog.Debug("mujica: password_input reveal", "shown", *shown)
diff --git a/radio_group.go b/radio_group.go
index b0ac1a8..9f6b11c 100644
--- a/radio_group.go
+++ b/radio_group.go
@@ -2,6 +2,7 @@ package mujica
 
 import (
 	"log/slog"
+	"slices"
 
 	"github.com/egoist/mygo/ui"
 
@@ -45,10 +46,17 @@ func RadioGroup[T comparable](c *ui.Context, value *T, items []RadioItem[T], opt
 	var r InputResult
 	// Disabled on a wrapper blocks the bases' clicks before they choose.
 	wrap := ui.Box(c).Shrink(0).Disabled(opts.Disabled)
+	// Keys by first appearance of each value: fmt keys would merge equal-looking values.
+	known := ui.Local(wrap, "values", func() []T { return nil })
 	wrap.Children(func() {
 		r.Element = ui.RadioGroup(c, func() {
 			for _, it := range items {
-				if radioGroupItem(c, k, d, value, it) {
+				key := slices.Index(*known, it.Value)
+				if key < 0 {
+					key = len(*known)
+					*known = append(*known, it.Value)
+				}
+				if radioGroupItem(c, k, d, value, it, key) {
 					r.changed = true
 					slog.Debug("mujica: radio_group choose", "label", it.Label)
 				}
@@ -58,21 +66,21 @@ func RadioGroup[T comparable](c *ui.Context, value *T, items []RadioItem[T], opt
 	if opts.Horizontal {
 		r.Element.Row().Gap(d.Unit() * 6)
 	}
-	if opts.Disabled && wrap.FocusWithin() {
+	if wrap.IsDisabled() && wrap.FocusWithin() {
 		wrap.FocusRing(false).Focus()
 	}
 	return r
 }
 
 // radioGroupItem builds one radio and reports whether it was chosen.
-func radioGroupItem[T comparable](c *ui.Context, k theme.Tokens, d theme.Density, value *T, it RadioItem[T]) bool {
+func radioGroupItem[T comparable](c *ui.Context, k theme.Tokens, d theme.Density, value *T, it RadioItem[T], key int) bool {
 	// Keyed by value so focus follows the item, not its position.
 	var row *ui.Element
-	item := ui.Box(c).Key(it.Value).Disabled(it.Disabled)
+	item := ui.Box(c).Key(key).Disabled(it.Disabled)
 	item.Children(func() {
 		row = ui.RadioBase(c, value, it.Value).Gap(d.Unit() * 2).MinHeight(d.ControlHeight()).FocusRing(false)
 	})
-	if it.Disabled && item.FocusWithin() {
+	if item.IsDisabled() && item.FocusWithin() {
 		item.FocusRing(false).Focus()
 	}
 	on := *value == it.Value
diff --git a/search_input.go b/search_input.go
index 176b042..ead6c59 100644
--- a/search_input.go
+++ b/search_input.go
@@ -59,8 +59,9 @@ func SearchInput(c *ui.Context, query *string, opts SearchInputOptions) SearchIn
 		name = place
 	}
 	var r SearchInputResult
+	look := &textInputLook{disabled: opts.Disabled}
 	step := func(d int) {
-		if opts.Matches == 0 || opts.Disabled {
+		if opts.Matches == 0 || look.disabled {
 			return
 		}
 		*opts.Current = (*opts.Current + d + opts.Matches) % opts.Matches
@@ -69,7 +70,10 @@ func SearchInput(c *ui.Context, query *string, opts SearchInputOptions) SearchIn
 	}
 	if opts.Find {
 		*opts.Current = max(0, min(*opts.Current, opts.Matches-1))
-		if !opts.Disabled {
+	}
+	r.Element, r.Input = textInputFrame(c, look, func(frame *ui.Element) *ui.Element {
+		if opts.Find {
+			// Built inside the frame, where step knows of disabled ancestors.
 			mac := runtime.GOOS == "darwin"
 			switch {
 			case mac && c.Shortcut(ui.Cmd, ui.KeyG), !mac && c.Shortcut(0, ui.KeyF3):
@@ -78,13 +82,10 @@ func SearchInput(c *ui.Context, query *string, opts SearchInputOptions) SearchIn
 				step(-1)
 			}
 		}
-	}
-	look := &textInputLook{disabled: opts.Disabled}
-	r.Element, r.Input = textInputFrame(c, look, func(frame *ui.Element) *ui.Element {
 		ui.Icon(c, icons.Must("search")).Size(16, 16).Shrink(0).TextColor(k.TextMuted)
 		back := ui.Local(frame, "back", func() bool { return false })
-		in := textInputEditor(c, frame, query, opts.Disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).Placeholder(place).Label(name)
-		r.changed = in.Changed() && !opts.Disabled
+		in := textInputEditor(c, frame, query, look.disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).Placeholder(place).Label(name)
+		r.changed = in.Changed() && !look.disabled
 		if opts.Find {
 			// Shift+Enter would reach the editor as a plain submit.
 			in.HandleInput(func(ev ui.InputEvent) bool {
@@ -102,9 +103,9 @@ func SearchInput(c *ui.Context, query *string, opts SearchInputOptions) SearchIn
 				step(1)
 			}
 		} else {
-			r.submitted = in.Submitted() && !opts.Disabled
+			r.submitted = in.Submitted() && !look.disabled
 		}
-		if *query != "" && !opts.Disabled && textInputClear(c, in) {
+		if *query != "" && !look.disabled && textInputClear(c, in) {
 			*query = ""
 			r.changed = true
 			slog.Debug("mujica: search_input clear")
diff --git a/testdata/snapshots/darwin/button-comfortable-dark.png b/testdata/snapshots/darwin/button-comfortable-dark.png
index afce442..309ee17 100644
Binary files a/testdata/snapshots/darwin/button-comfortable-dark.png and b/testdata/snapshots/darwin/button-comfortable-dark.png differ
diff --git a/testdata/snapshots/darwin/button-comfortable-light.png b/testdata/snapshots/darwin/button-comfortable-light.png
index 0980b9b..492caf4 100644
Binary files a/testdata/snapshots/darwin/button-comfortable-light.png and b/testdata/snapshots/darwin/button-comfortable-light.png differ
diff --git a/testdata/snapshots/darwin/button-compact-dark.png b/testdata/snapshots/darwin/button-compact-dark.png
index e0868f3..a78d663 100644
Binary files a/testdata/snapshots/darwin/button-compact-dark.png and b/testdata/snapshots/darwin/button-compact-dark.png differ
diff --git a/testdata/snapshots/darwin/button-compact-light.png b/testdata/snapshots/darwin/button-compact-light.png
index 8afc2ba..0ea1a55 100644
Binary files a/testdata/snapshots/darwin/button-compact-light.png and b/testdata/snapshots/darwin/button-compact-light.png differ
diff --git a/testdata/snapshots/darwin/button-dark.png b/testdata/snapshots/darwin/button-dark.png
index 365330b..962fc23 100644
Binary files a/testdata/snapshots/darwin/button-dark.png and b/testdata/snapshots/darwin/button-dark.png differ
diff --git a/testdata/snapshots/darwin/button-light.png b/testdata/snapshots/darwin/button-light.png
index dbf5a78..5944471 100644
Binary files a/testdata/snapshots/darwin/button-light.png and b/testdata/snapshots/darwin/button-light.png differ
diff --git a/testdata/snapshots/darwin/number_input-dark.png b/testdata/snapshots/darwin/number_input-dark.png
index 959270c..102c51f 100644
Binary files a/testdata/snapshots/darwin/number_input-dark.png and b/testdata/snapshots/darwin/number_input-dark.png differ
diff --git a/testdata/snapshots/darwin/number_input-light.png b/testdata/snapshots/darwin/number_input-light.png
index 74f4781..f3ab0a9 100644
Binary files a/testdata/snapshots/darwin/number_input-light.png and b/testdata/snapshots/darwin/number_input-light.png differ
diff --git a/testdata/snapshots/darwin/spinner-dark.png b/testdata/snapshots/darwin/spinner-dark.png
index a34bd86..1a9fe92 100644
Binary files a/testdata/snapshots/darwin/spinner-dark.png and b/testdata/snapshots/darwin/spinner-dark.png differ
diff --git a/testdata/snapshots/darwin/spinner-light.png b/testdata/snapshots/darwin/spinner-light.png
index aed49d0..0353909 100644
Binary files a/testdata/snapshots/darwin/spinner-light.png and b/testdata/snapshots/darwin/spinner-light.png differ
diff --git a/text_area.go b/text_area.go
index 7dc8eac..b9e82b8 100644
--- a/text_area.go
+++ b/text_area.go
@@ -55,7 +55,7 @@ func TextArea(c *ui.Context, value *string, opts TextAreaOptions) InputResult {
 	var r InputResult
 	look := &textInputLook{disabled: opts.Disabled, readOnly: opts.ReadOnly, err: errMsg, area: true}
 	r.Element, r.Input = textInputFrame(c, look, func(frame *ui.Element) *ui.Element {
-		in := textInputEditor(c, frame, value, opts.ReadOnly || opts.Disabled, ui.TextAreaBase).Grow(1).Padding(d.Unit()*2, d.Unit()*3).
+		in := textInputEditor(c, frame, value, opts.ReadOnly || look.disabled, ui.TextAreaBase).Grow(1).Padding(d.Unit()*2, d.Unit()*3).
 			Placeholder(opts.Placeholder).Label(opts.Label)
 		if opts.MinHeight > 0 {
 			in.MinHeight(opts.MinHeight)
@@ -63,7 +63,7 @@ func TextArea(c *ui.Context, value *string, opts TextAreaOptions) InputResult {
 		if opts.MaxHeight > 0 {
 			in.MaxHeight(opts.MaxHeight)
 		}
-		r.changed = in.Changed() && !opts.ReadOnly && !opts.Disabled
+		r.changed = in.Changed() && !opts.ReadOnly && !look.disabled
 		// Taken before the editor, which would make a plain Enter a newline.
 		submit := ui.Local(frame, "submit", func() bool { return false })
 		in.HandleInput(func(ev ui.InputEvent) bool {
@@ -73,7 +73,7 @@ func TextArea(c *ui.Context, value *string, opts TextAreaOptions) InputResult {
 			}
 			return false
 		})
-		r.submitted = *submit && !opts.Disabled
+		r.submitted = *submit && !look.disabled
 		*submit = false
 		return in
 	}, count)
diff --git a/text_input.go b/text_input.go
index acacf0d..961e082 100644
--- a/text_input.go
+++ b/text_input.go
@@ -53,11 +53,11 @@ func TextInput(c *ui.Context, value *string, opts TextInputOptions) InputResult
 		if opts.Leading != nil {
 			opts.Leading()
 		}
-		in := textInputEditor(c, frame, value, opts.ReadOnly || opts.Disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).
+		in := textInputEditor(c, frame, value, opts.ReadOnly || look.disabled, ui.TextInputBase).Grow(1).MinWidth(Density(c).Unit() * 10).
 			Placeholder(opts.Placeholder).Label(opts.Label)
-		r.changed = in.Changed() && !opts.ReadOnly && !opts.Disabled
-		r.submitted = in.Submitted() && !opts.Disabled
-		if opts.Clearable && *value != "" && !opts.ReadOnly && !opts.Disabled {
+		r.changed = in.Changed() && !opts.ReadOnly && !look.disabled
+		r.submitted = in.Submitted() && !look.disabled
+		if opts.Clearable && *value != "" && !opts.ReadOnly && !look.disabled {
 			if textInputClear(c, in) {
 				*value = ""
 				r.changed = true
@@ -75,7 +75,7 @@ func TextInput(c *ui.Context, value *string, opts TextInputOptions) InputResult
 // textInputFade eases hover, focus and error colors.
 var textInputFade = ui.ElementTransition{Colors: true, Duration: theme.StateDuration}
 
-// textInputLook is the state a field frame shows.
+// textInputLook is the state a field frame shows; disabled gains any disabled ancestor.
 type textInputLook struct {
 	disabled, readOnly, area bool
 	err                      string
@@ -86,6 +86,8 @@ func textInputFrame(c *ui.Context, look *textInputLook, build func(frame *ui.Ele
 	k := Tokens(c)
 	d := Density(c)
 	outer = ui.Column(c).Gap(d.Unit()).Shrink(0).Disabled(look.disabled)
+	// One disabled state, the field's own or an ancestor's, for build to obey.
+	look.disabled = outer.IsDisabled()
 	outer.Children(func() {
 		frame := ui.Row(c).Radius(theme.ControlRadius).Gap(d.Unit() * 2).Cursor(ui.CursorText)
 		if look.area {