ui(properties): one typography hierarchy, pill switches, and tokens instead of hex

Creator directive 2026-11-01: the properties panels had 14 hand-rolled heading styles, 37
hand-rolled labels, four literal grey hex values, and 14 square checkboxes.

- PropertyHeader / PropertySubHeader / PropertyFieldLabel / PropertyHint in Themes/Controls.xaml
  now carry the whole hierarchy: category bright and 11px, labels and hints dim, size and weight
  doing the level. Colour groups the panel — bright for what you edit, dim for its labels and
  help — and no new palette entry was needed; DESIGN.md stays the only colour source.
- Every checkbox in the panel is a pill switch (PropertyPillCheck, 32x16 animated thumb).
  IsChecked semantics unchanged, so no binding moved.
- Literal #888/#666/#555 became OnSurfaceVariant / OnSurfaceDisabled.
- 13 headings, 2 sub-headers and 31 in-row labels now reference a style instead of repeating
  colour + size + alignment inline.

Controls audited for backing: every Button/Slider/ComboBox/CheckBox/ToggleButton/TextBox in the
panel has a Command or Click, a Value binding, an ItemsSource or Selected*, IsChecked, or Text —
no dead controls. Release 0 warnings; typography and token tests pass.

Controls/LeftPanel.xaml

@@ -277,7 +277,7 @@
                         </ListBox.ItemTemplate>
                     </Helpers:FocusPreservingListBox>
 
-                            <TextBlock Grid.Row="2" Text="No layers yet" Foreground="#555" FontSize="12"
+                            <TextBlock Grid.Row="2" Text="No layers yet" Foreground="{StaticResource Brush.OnSurfaceDisabled}" FontSize="12"
                                HorizontalAlignment="Center" VerticalAlignment="Center"
                                Visibility="{Binding ShowSourcesEmptyHint, Converter={StaticResource BoolToVis}}"/>
 
@@ -330,7 +330,7 @@
                                      is not offered in the vertical Chat layout, so that option
                                      is not even shown there (CanToggleClipShape). -->
                                 <StackPanel Visibility="{Binding IsWebcamSelected, Converter={StaticResource BoolToVis}}">
-                                    <TextBlock Text="Shape" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
+                                    <TextBlock Text="Shape" Style="{StaticResource PropertyHeader}"/>
                                     <StackPanel Orientation="Horizontal" Margin="10,0,0,4">
                                         <Button Content="{Binding SelectedElement.MirrorButtonText}"
                                                 Style="{StaticResource YtButtonSecondary}" Padding="10,4"
@@ -350,7 +350,7 @@
                                      strength slider, on the SAME 0–1 scale and default as the
                                      webcam's background blur — one radius curve, shared. -->
                                 <StackPanel Visibility="{Binding IsBlurSelected, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                    <TextBlock Text="Blur" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
+                                    <TextBlock Text="Blur" Style="{StaticResource PropertyHeader}"/>
                                     <StackPanel Orientation="Horizontal" Margin="10,0,0,6">
                                         <ToggleButton Style="{StaticResource SegmentToggle}" Padding="10,4"
                                                       IsChecked="{Binding SelectedElement.IsRectShape, Mode=TwoWay}">
@@ -362,7 +362,7 @@
                                         </ToggleButton>
                                     </StackPanel>
                                     <DockPanel Margin="10,0,0,4">
-                                        <TextBlock DockPanel.Dock="Right" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Margin="8,0,0,0" Width="34">
+                                        <TextBlock DockPanel.Dock="Right" Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="34">
                                             <Run Text="{Binding SelectedElement.BlurAmount, Mode=OneWay, StringFormat={}{0:P0}}"/>
                                         </TextBlock>
                                         <Slider Minimum="0" Maximum="1" SmallChange="0.05" LargeChange="0.1"
@@ -386,23 +386,23 @@
                                  above) so the webcam's border/background section stays the
                                  one panel bound to SelectedElement.IsWebcam. -->
                             <StackPanel Visibility="{Binding SelectedElement.IsDraggable, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                <TextBlock Text="Geometry" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,8,0,4"/>
+                                <TextBlock Text="Geometry" Style="{StaticResource PropertyHeader}"/>
                                 <!-- TASK 61: the four fields share ONE fixed width — wide enough
                                      for the largest geometry value (1920, plus a typed sign) and
                                      no wider, so Y/H no longer stretch to fill the row. -->
                                 <DockPanel Margin="10,0,0,4" LastChildFill="False">
-                                    <TextBlock DockPanel.Dock="Left" Text="X" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="16"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="X" Style="{StaticResource PropertyFieldLabel}" Width="16"/>
                                     <TextBox Text="{Binding SelectedElement.X, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="44"/>
-                                    <TextBlock DockPanel.Dock="Left" Text="  Y" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="  Y" Style="{StaticResource PropertyFieldLabel}" Width="20" Margin="8,0,0,0"/>
                                     <TextBox Text="{Binding SelectedElement.Y, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="44"/>
                                 </DockPanel>
                                 <DockPanel Margin="10,0,0,4" LastChildFill="False">
-                                    <TextBlock DockPanel.Dock="Left" Text="W" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="16"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="W" Style="{StaticResource PropertyFieldLabel}" Width="16"/>
                                     <TextBox Text="{Binding SelectedElement.Width, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="44"/>
-                                    <TextBlock DockPanel.Dock="Left" Text="  H" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="  H" Style="{StaticResource PropertyFieldLabel}" Width="20" Margin="8,0,0,0"/>
                                     <TextBox Text="{Binding SelectedElement.Height, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="44"/>
                                 </DockPanel>
@@ -410,7 +410,7 @@
 
                             <!-- Webcam border config -->
                             <StackPanel Visibility="{Binding SelectedElement.IsWebcam, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                <TextBlock Text="Border Color" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,8,0,2"/>
+                                <TextBlock Text="Border Color" Style="{StaticResource PropertyHeader}"/>
                                 <!-- TASK 63: the border colour is picked with the app's OWN
                                      drop-down (YtComboBox) — the same widget the Display
                                      and Font pickers use — not a hand-rolled menu. The hex
@@ -429,7 +429,7 @@
                                               ToolTip="Border colour" MinWidth="100"
                                               Margin="8,0,0,0" VerticalAlignment="Center"/>
                                 </DockPanel>
-                                <TextBlock Text="Border Thickness" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,8,0,2"/>
+                                <TextBlock Text="Border Thickness" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="10,0,0,6">
                                     <Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
                                             Width="22" Height="22" Margin="4,0,0,0"
@@ -446,17 +446,16 @@
                                     <Slider DockPanel.Dock="Left" Width="120" Minimum="0" Maximum="10"
                                             Value="{Binding SelectedElement.BorderWidth, Mode=TwoWay}"
                                             VerticalAlignment="Center" TickFrequency="1" IsSnapToTickEnabled="True"/>
-                                    <TextBlock Text="{Binding SelectedElement.BorderWidth}" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11"
+                                    <TextBlock Text="{Binding SelectedElement.BorderWidth}" Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="20"/>
-                                               VerticalAlignment="Center" Margin="8,0,0,0" Width="20"/>
                                 </DockPanel>
 
                                 <!-- TASK 51: background effects — two pills acting as radio buttons
                                      (one on turns the other off; both off = no effect). TASK 59:
                                      the pills are indented under the Background title, and the
                                      strength row one level deeper, under Blur. -->
-                                <TextBlock Text="Background" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,8,0,6"/>
+                                <TextBlock Text="Background" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="10,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Remove" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Remove" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <ToggleButton x:Name="RemoveBackgroundPill" Style="{StaticResource PillToggle}"
                                                   IsChecked="{Binding SelectedElement.RemoveBackground, Mode=TwoWay}"
                                                   AutomationProperties.Name="Remove background"
@@ -464,7 +463,7 @@
                                                   HorizontalAlignment="Left"/>
                                 </DockPanel>
                                 <DockPanel Margin="10,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Blur" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Blur" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <ToggleButton x:Name="BlurBackgroundPill" Style="{StaticResource PillToggle}"
                                                   IsChecked="{Binding SelectedElement.BlurBackground, Mode=TwoWay}"
                                                   AutomationProperties.Name="Blur background"
@@ -473,9 +472,9 @@
                                 </DockPanel>
                                 <DockPanel Margin="20,0,0,6"
                                            Visibility="{Binding SelectedElement.HasBackgroundEffect, Converter={StaticResource BoolToVis}}">
-                                    <TextBlock DockPanel.Dock="Left" Text="Strength" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Strength" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <TextBlock DockPanel.Dock="Right" Text="{Binding SelectedElement.BackgroundStrength, StringFormat={}{0:P0}}"
-                                               Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Margin="8,0,0,0" Width="34"/>
+                                               Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="34"/>
                                     <Slider x:Name="BackgroundStrengthSlider" Minimum="0" Maximum="1"
                                             Value="{Binding SelectedElement.BackgroundStrength, Mode=TwoWay}"
                                             TickFrequency="0.05" IsSnapToTickEnabled="True" VerticalAlignment="Center"
@@ -496,7 +495,7 @@
                                            Visibility="{Binding CanUseScoreboard, Converter={StaticResource InverseBoolToVis}}"/>
                                 <!-- DEBUG builds only: prove the strip in the preview before a real
                                      stream. Absent from Release, not merely hidden by a flag. -->
-                                <CheckBox Style="{StaticResource YtCheckBox}" Margin="0,0,0,4"
+                                <CheckBox Style="{StaticResource PropertyPillCheck}" Margin="0,0,0,4"
                                           IsChecked="{Binding ScoreboardSimulate, Mode=TwoWay}"
                                           ToolTip="Push sample events so the strip appears in the preview."
                                           Visibility="{Binding IsDevelopmentBuild, Converter={StaticResource BoolToVis}}">
@@ -504,11 +503,10 @@
                                          be mistaken for product. -->
                                     <TextBlock Text="Simulate (dev)" Foreground="{StaticResource Brush.Attention}" FontSize="12"/>
                                 </CheckBox>
-                                <CheckBox Style="{StaticResource YtCheckBox}" Margin="0,0,0,4"
+                                <CheckBox Style="{StaticResource PropertyPillCheck}" Margin="0,0,0,4"
                                           Content="Show the scoreboard" IsChecked="{Binding ScoreboardEnabled, Mode=TwoWay}"
                                           ToolTip="Off hides the strip in every scene AND stops the channel polling."/>
-                                <TextBlock Text="Edge (socials take the other)" Foreground="{StaticResource Brush.OnSurfaceVariant}"
+                                <TextBlock Text="Edge (socials take the other)" Style="{StaticResource PropertySubHeader}"/>
-                                           FontSize="11" Margin="10,0,0,2"/>
                                 <ComboBox Style="{StaticResource YtComboBox}" Height="24" FontSize="11" Margin="10,0,0,6"
                                           ItemsSource="{Binding ScoreboardEdgeOptions}"
                                           SelectedItem="{Binding ScoreboardEdge, Mode=TwoWay}"/>
@@ -523,32 +521,32 @@
                                             Value="{Binding ScoreboardScrollSpeed, Mode=TwoWay}" VerticalAlignment="Center"/>
                                 </DockPanel>
 
-                                <TextBlock Text="Facts" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
+                                <TextBlock Text="Facts" Style="{StaticResource PropertyHeader}"/>
                                 <WrapPanel Margin="10,0,0,0">
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Subscribers" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Subscribers" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowSubscribers, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Watch hours" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Watch hours" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowWatchHours, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Super Chats" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Super Chats" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowSuperChats, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="New members" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="New members" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowNewMembers, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Milestones" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Milestones" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowMilestones, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Last member" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Last member" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowLastMember, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Last Super Chat" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Last Super Chat" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowLastSuperChat, Mode=TwoWay}"/>
-                                    <CheckBox Style="{StaticResource YtCheckBox}" Content="Last gift" Margin="0,0,10,4"
+                                    <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Last gift" Margin="0,0,10,4"
                                               IsChecked="{Binding ScoreboardShowLastGift, Mode=TwoWay}"/>
                                 </WrapPanel>
 
-                                <TextBlock Text="Text colour" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" Margin="10,6,0,2"/>
+                                <TextBlock Text="Text colour" Style="{StaticResource PropertySubHeader}"/>
                                 <ComboBox Style="{StaticResource YtComboBox}" Height="24" FontSize="11" Margin="10,0,0,6"
                                           ItemsSource="{Binding ScoreboardColorOptions}" DisplayMemberPath="Name"
                                           SelectedValuePath="Hex" SelectedValue="{Binding ScoreboardTextColor, Mode=TwoWay}"/>
 
-                                <CheckBox Style="{StaticResource YtCheckBox}" Content="Background" Margin="10,0,0,4"
+                                <CheckBox Style="{StaticResource PropertyPillCheck}" Content="Background" Margin="10,0,0,4"
                                           IsChecked="{Binding ScoreboardBackgroundEnabled, Mode=TwoWay}"/>
                                 <ComboBox Style="{StaticResource YtComboBox}" Height="24" FontSize="11" Margin="10,0,0,6"
                                           ItemsSource="{Binding ScoreboardColorOptions}" DisplayMemberPath="Name"
@@ -593,27 +591,26 @@
                                     <Slider DockPanel.Dock="Left" Width="120" Minimum="1" Maximum="60"
                                             Value="{Binding SelectedElement.TimerMinutes, Mode=TwoWay}"
                                             VerticalAlignment="Center" TickFrequency="1" IsSnapToTickEnabled="True"/>
-                                    <TextBlock Text="{Binding SelectedElement.TimerMinutes}" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11"
+                                    <TextBlock Text="{Binding SelectedElement.TimerMinutes}" Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="20"/>
-                                               VerticalAlignment="Center" Margin="8,0,0,0" Width="20"/>
                                 </DockPanel>
                             </StackPanel>
 
                             <!-- Web source config -->
                             <StackPanel Visibility="{Binding SelectedElement.IsWebSource, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                <TextBlock Text="Geometry" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
+                                <TextBlock Text="Geometry" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="X" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="16"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="X" Style="{StaticResource PropertyFieldLabel}" Width="16"/>
                                     <TextBox Text="{Binding SelectedElement.X, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}"/>
-                                    <TextBlock DockPanel.Dock="Left" Text="  Y" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="  Y" Style="{StaticResource PropertyFieldLabel}" Width="20" Margin="8,0,0,0"/>
                                     <TextBox Text="{Binding SelectedElement.Y, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}"/>
                                 </DockPanel>
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="W" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="16"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="W" Style="{StaticResource PropertyFieldLabel}" Width="16"/>
                                     <TextBox Text="{Binding SelectedElement.Width, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}"/>
-                                    <TextBlock DockPanel.Dock="Left" Text="  H" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="  H" Style="{StaticResource PropertyFieldLabel}" Width="20" Margin="8,0,0,0"/>
                                     <TextBox Text="{Binding SelectedElement.Height, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
                                              Style="{StaticResource YtTextBoxCompact}"/>
                                 </DockPanel>
@@ -639,10 +636,10 @@
 
                             <!-- Chat box config -->
                             <StackPanel Visibility="{Binding SelectedElement.IsChatBox, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                <TextBlock Text="Chat Overlay" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,6"/>
+                                <TextBlock Text="Chat Overlay" Style="{StaticResource PropertyHeader}"/>
 
                                 <!-- Border (same controls as the webcam's border) -->
-                                <TextBlock Text="Border Color" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,2"/>
+                                <TextBlock Text="Border Color" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="10,0,0,6">
                                     <TextBox DockPanel.Dock="Left"
                                              Text="{Binding SelectedElement.BorderColor, UpdateSourceTrigger=PropertyChanged}"
@@ -656,26 +653,24 @@
                                               ToolTip="Border colour" MinWidth="100"
                                               Margin="8,0,0,0" VerticalAlignment="Center"/>
                                 </DockPanel>
-                                <TextBlock Text="Border Thickness" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,2"/>
+                                <TextBlock Text="Border Thickness" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="10,0,0,6">
                                     <Slider DockPanel.Dock="Left" Width="120" Minimum="0" Maximum="10"
                                             Value="{Binding SelectedElement.BorderWidth, Mode=TwoWay}"
                                             VerticalAlignment="Center" TickFrequency="1" IsSnapToTickEnabled="True"/>
-                                    <TextBlock Text="{Binding SelectedElement.BorderWidth}" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11"
+                                    <TextBlock Text="{Binding SelectedElement.BorderWidth}" Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="20"/>
-                                               VerticalAlignment="Center" Margin="8,0,0,0" Width="20"/>
                                 </DockPanel>
-                                <TextBlock Text="Border Opacity" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,2"/>
+                                <TextBlock Text="Border Opacity" Style="{StaticResource PropertyHeader}"/>
                                 <DockPanel Margin="10,0,0,8">
                                     <Slider DockPanel.Dock="Left" Width="120" Minimum="0" Maximum="1"
                                             Value="{Binding SelectedElement.BorderOpacity, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
-                                    <TextBlock Text="{Binding SelectedElement.BorderOpacity, StringFormat={}{0:P0}}" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11"
+                                    <TextBlock Text="{Binding SelectedElement.BorderOpacity, StringFormat={}{0:P0}}" Style="{StaticResource PropertyFieldLabel}" Margin="8,0,0,0" Width="34"/>
-                                               VerticalAlignment="Center" Margin="8,0,0,0" Width="34"/>
                                 </DockPanel>
 
                                 <!-- Font Size -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Font Size" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Font Size" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <Slider x:Name="ChatFontSizeSlider" Width="120" Minimum="8" Maximum="72" TickFrequency="2" IsSnapToTickEnabled="True"
                                             Value="{Binding SelectedElement.ChatFontSize, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
@@ -684,7 +679,7 @@
 
                                 <!-- Font Family -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Font" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Font" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <ComboBox SelectedValue="{Binding SelectedElement.ChatFontFamily, Mode=TwoWay}"
                                               SelectedValuePath="Content"
                                               Style="{StaticResource YtComboBox}"
@@ -700,28 +695,28 @@
 
                                 <!-- Font Color -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Font Color" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Font Color" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <TextBox Text="{Binding SelectedElement.ChatFontColor, UpdateSourceTrigger=PropertyChanged}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="80"/>
                                 </DockPanel>
 
                                 <!-- Member Color -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Member" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Member" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <TextBox Text="{Binding SelectedElement.ChatMemberColor, UpdateSourceTrigger=PropertyChanged}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="80"/>
                                 </DockPanel>
 
                                 <!-- Super Chat Color -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Super Chat" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Super Chat" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <TextBox Text="{Binding SelectedElement.ChatSuperChatColor, UpdateSourceTrigger=PropertyChanged}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="80"/>
                                 </DockPanel>
 
                                 <!-- Max Messages -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Max Msgs" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Max Msgs" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <Slider x:Name="ChatMaxMsgsSlider" Width="120" Minimum="1" Maximum="20" TickFrequency="1" IsSnapToTickEnabled="True"
                                             Value="{Binding SelectedElement.ChatMaxMessages, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
@@ -730,14 +725,14 @@
 
                                 <!-- Background Color -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Background" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Background" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <TextBox Text="{Binding SelectedElement.ChatBackgroundColor, UpdateSourceTrigger=PropertyChanged}"
                                              Style="{StaticResource YtTextBoxCompact}" Width="80"/>
                                 </DockPanel>
 
                                 <!-- Background Opacity -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Bg Opacity" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Bg Opacity" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <Slider x:Name="ChatBgOpacitySlider" Width="120" Minimum="0" Maximum="1"
                                             Value="{Binding SelectedElement.ChatBackgroundOpacity, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
@@ -746,7 +741,7 @@
 
                                 <!-- Fade After (seconds) -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Fade After" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="70"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Fade After" Style="{StaticResource PropertyFieldLabel}" Width="70"/>
                                     <Slider x:Name="ChatFadeSlider" Width="120" Minimum="0" Maximum="60" TickFrequency="5" IsSnapToTickEnabled="True"
                                             Value="{Binding SelectedElement.ChatFadeSeconds, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
@@ -754,17 +749,17 @@
                                 </DockPanel>
 
                                 <!-- Toggles -->
-                                <CheckBox Content="Show timestamps" Style="{StaticResource YtCheckBox}" Margin="0,4,0,2"
+                                <CheckBox Content="Show timestamps" Style="{StaticResource PropertyPillCheck}" Margin="0,4,0,2"
                                           IsChecked="{Binding SelectedElement.ChatShowTimestamps, Mode=TwoWay}"/>
-                                <CheckBox Content="Show badges" Style="{StaticResource YtCheckBox}" Margin="0,0,0,2"
+                                <CheckBox Content="Show badges" Style="{StaticResource PropertyPillCheck}" Margin="0,0,0,2"
                                           IsChecked="{Binding SelectedElement.ChatShowBadges, Mode=TwoWay}"/>
                             </StackPanel>
 
                             <!-- Stream Alerts config -->
                             <StackPanel Visibility="{Binding SelectedElement.IsAlertBox, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
-                                <TextBlock Text="Stream Alerts" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,6"/>
+                                <TextBlock Text="Stream Alerts" Style="{StaticResource PropertyHeader}"/>
                                 <TextBlock Text="The built-in clip plays on every alert (Super Chat, membership…) unless a custom video is picked."
-                                           Foreground="#888" FontSize="10" TextWrapping="Wrap" Margin="0,0,0,6"/>
+                                           Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="10" TextWrapping="Wrap" Margin="0,0,0,6"/>
 
                                 <DockPanel Margin="0,0,0,4">
                                     <!-- Test alert (creator ruling 2026-11-01): plays the clip this box
@@ -774,7 +769,7 @@
                                             Style="{StaticResource YtButtonSecondary}"
                                             Padding="8,2" FontSize="11" VerticalAlignment="Center"
                                             ToolTip="Play the alert here, exactly as a viewer would trigger it"/>
-                                    <TextBlock DockPanel.Dock="Left" Text="Built-in video" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Built-in video" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <ToggleButton Style="{StaticResource PillToggle}"
                                                   IsChecked="{Binding SelectedElement.AlertUseDefaultVideo, Mode=TwoWay}"
                                                   HorizontalAlignment="Left"/>
@@ -797,7 +792,7 @@
                                              Style="{StaticResource YtTextBoxCompact}" IsReadOnly="True"
                                              Foreground="{StaticResource Brush.OnSurfaceVariant}" VerticalAlignment="Center"/>
                                 </DockPanel>
-                                <CheckBox Content="Loop the sound until the video ends" Style="{StaticResource YtCheckBox}" Margin="0,2,0,6"
+                                <CheckBox Content="Loop the sound until the video ends" Style="{StaticResource PropertyPillCheck}" Margin="0,2,0,6"
                                           IsChecked="{Binding SelectedElement.AlertAudioLoop, Mode=TwoWay}"
                                           IsEnabled="{Binding SelectedElement.HasAlertAudio}"/>
 
@@ -819,10 +814,10 @@
                                         CommandParameter="{Binding SelectedElement}" Style="{StaticResource YtButtonSecondary}"
                                         HorizontalAlignment="Left" Padding="8,2" Margin="0,0,4,0"/>
                                 <TextBlock Text="Custom clips are referenced from disk — never stored in the layout."
-                                           Foreground="#888" FontSize="10" TextWrapping="Wrap" Margin="0,4,0,6"/>
+                                           Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="10" TextWrapping="Wrap" Margin="0,4,0,6"/>
 
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Message ticker" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Message ticker" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <ToggleButton Style="{StaticResource PillToggle}"
                                                   IsChecked="{Binding SelectedElement.AlertShowTicker, Mode=TwoWay}"
                                                   HorizontalAlignment="Left"/>
@@ -832,7 +827,7 @@
                                      solid (still). Inline items, not a bound ItemsSource —
                                      same shape as the chat Font selector above. -->
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Display" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Display" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <ComboBox SelectedValue="{Binding SelectedElement.AlertDisplayMethod, Mode=TwoWay}"
                                               SelectedValuePath="Tag"
                                               Style="{StaticResource YtComboBox}"
@@ -844,7 +839,7 @@
                                 </DockPanel>
 
                                 <DockPanel Margin="0,0,0,4">
-                                    <TextBlock DockPanel.Dock="Left" Text="Volume" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Width="84"/>
+                                    <TextBlock DockPanel.Dock="Left" Text="Volume" Style="{StaticResource PropertyFieldLabel}" Width="84"/>
                                     <Slider Width="120" Minimum="0" Maximum="1"
                                             Value="{Binding SelectedElement.AlertVideoVolume, Mode=TwoWay}"
                                             VerticalAlignment="Center"/>
@@ -858,7 +853,7 @@
                                 <TextBlock Text="Background" Style="{StaticResource SubHeader}"/>
                                 <StackPanel Margin="4,0,0,0">
                                     <StackPanel Orientation="Horizontal" Margin="0,0,0,8">
-                                        <TextBlock Text="Use default background:" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center"/>
+                                        <TextBlock Text="Use default background:" Style="{StaticResource PropertyFieldLabel}"/>
                                         <ToggleButton Style="{StaticResource PillToggle}"
                                                       IsChecked="{Binding SelectedElement.UseDefaultBackground, Mode=TwoWay}"
                                                       Margin="8,0,0,0"/>
@@ -900,7 +895,7 @@
                         <TextBlock Text="Chat is inactive" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="13"
                                    HorizontalAlignment="Center" Margin="0,0,0,4"/>
                         <TextBlock Text="Chat becomes active once LlamaCasty is connected and streaming on YouTube."
-                                   Foreground="#666" FontSize="11" TextWrapping="Wrap"
+                                   Foreground="{StaticResource Brush.OnSurfaceDisabled}" FontSize="11" TextWrapping="Wrap"
                                    HorizontalAlignment="Center" TextAlignment="Center" MaxWidth="240"/>
                     </StackPanel>
 

Themes/Controls.xaml

@@ -145,6 +145,105 @@
     <!-- Dark check box. The default WPF template is the light system one — it
          sticks out of the dark panels, so every check box carries this style
          (the guard test in ytLive.Tests/PropertiesStyleTests.cs enforces it). -->
+    <!-- ═══ Property-panel typography (2026-11-01) ═══
+         One hierarchy for every properties section, so no panel invents its own:
+           PropertyHeader    — the category (bright, 11px, semibold)
+           PropertySubHeader — a field label inside it (dim, 10px, indented)
+           PropertyHint      — the explanatory sentence under a control (dim, 10px, wrapped)
+         Colour does the grouping: bright for the thing you are editing, dim for its labels and
+         help. No new palette entries; these are the existing OnSurface / OnSurfaceVariant tokens. -->
+    <Style x:Key="PropertyHeader" TargetType="TextBlock">
+        <Setter Property="Foreground" Value="{StaticResource Brush.OnSurface}"/>
+        <Setter Property="FontSize" Value="11"/>
+        <Setter Property="FontWeight" Value="SemiBold"/>
+        <Setter Property="Margin" Value="0,0,0,6"/>
+    </Style>
+
+    <Style x:Key="PropertySubHeader" TargetType="TextBlock">
+        <Setter Property="Foreground" Value="{StaticResource Brush.OnSurfaceVariant}"/>
+        <Setter Property="FontSize" Value="10"/>
+        <Setter Property="FontWeight" Value="SemiBold"/>
+        <Setter Property="Margin" Value="10,6,0,3"/>
+    </Style>
+
+    <!-- A field label that sits in a row with its control (DockPanel.Dock="Left", fixed Width).
+         Same typography as PropertySubHeader, but vertically centred and marginless so the rows
+         stay on a grid. -->
+    <Style x:Key="PropertyFieldLabel" TargetType="TextBlock">
+        <Setter Property="Foreground" Value="{StaticResource Brush.OnSurfaceVariant}"/>
+        <Setter Property="FontSize" Value="10"/>
+        <Setter Property="FontWeight" Value="SemiBold"/>
+        <Setter Property="VerticalAlignment" Value="Center"/>
+    </Style>
+
+    <Style x:Key="PropertyHint" TargetType="TextBlock">
+        <Setter Property="Foreground" Value="{StaticResource Brush.OnSurfaceVariant}"/>
+        <Setter Property="FontSize" Value="10"/>
+        <Setter Property="TextWrapping" Value="Wrap"/>
+        <Setter Property="Margin" Value="10,0,0,6"/>
+    </Style>
+
+    <!-- Checkboxes are pill switches (creator ruling 2026-11-01): a 14px box in a properties panel
+         reads as a form, and a switch reads as a setting. IsChecked semantics are untouched, so
+         every existing binding still works. -->
+    <Style x:Key="PropertyPillCheck" TargetType="CheckBox">
+        <Setter Property="Foreground" Value="{StaticResource Brush.OnSurface}"/>
+        <Setter Property="FontSize" Value="11"/>
+        <Setter Property="Cursor" Value="Hand"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="CheckBox">
+                    <Grid Background="Transparent">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="Auto"/>
+                            <ColumnDefinition Width="*"/>
+                        </Grid.ColumnDefinitions>
+                        <Border x:Name="Track" Grid.Column="0" Width="32" Height="16" CornerRadius="8"
+                                Background="{StaticResource Brush.SurfaceContainerHighest}"
+                                BorderBrush="{StaticResource Brush.Outline}" BorderThickness="1"
+                                VerticalAlignment="Center">
+                            <Ellipse x:Name="Thumb" Width="10" Height="10" Fill="{StaticResource Brush.OnSurfaceVariant}"
+                                     HorizontalAlignment="Left" Margin="2,0,0,0">
+                                <Ellipse.RenderTransform>
+                                    <TranslateTransform x:Name="ThumbShift" X="0"/>
+                                </Ellipse.RenderTransform>
+                            </Ellipse>
+                        </Border>
+                        <ContentPresenter Grid.Column="1" Margin="8,0,0,0" VerticalAlignment="Center"
+                                          RecognizesAccessKey="True"/>
+                    </Grid>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="IsChecked" Value="True">
+                            <Setter TargetName="Track" Property="Background" Value="{StaticResource Brush.Tertiary}"/>
+                            <Setter TargetName="Track" Property="BorderBrush" Value="{StaticResource Brush.Tertiary}"/>
+                            <Setter TargetName="Thumb" Property="Fill" Value="{StaticResource Brush.OnAccent}"/>
+                            <Trigger.EnterActions>
+                                <BeginStoryboard>
+                                    <Storyboard>
+                                        <DoubleAnimation Storyboard.TargetName="ThumbShift" Storyboard.TargetProperty="X"
+                                                         To="16" Duration="0:0:0.12"/>
+                                    </Storyboard>
+                                </BeginStoryboard>
+                            </Trigger.EnterActions>
+                            <Trigger.ExitActions>
+                                <BeginStoryboard>
+                                    <Storyboard>
+                                        <DoubleAnimation Storyboard.TargetName="ThumbShift" Storyboard.TargetProperty="X"
+                                                         To="0" Duration="0:0:0.12"/>
+                                    </Storyboard>
+                                </BeginStoryboard>
+                            </Trigger.ExitActions>
+                        </Trigger>
+                        <Trigger Property="IsEnabled" Value="False">
+                            <Setter Property="Foreground" Value="{StaticResource Brush.OnSurfaceDisabled}"/>
+                            <Setter TargetName="Track" Property="Opacity" Value="0.5"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
     <Style x:Key="YtCheckBox" TargetType="CheckBox">
         <Setter Property="Foreground" Value="{StaticResource Brush.OnSurface}"/>
         <Setter Property="FontSize" Value="11"/>

docs/ai/ui-surface.md

@@ -185,3 +185,14 @@ skip (would spam every launch). Still modal by design: SocialsDialog's slot-dele
 - The image lives in the asset table; the settings table keeps its asset id and file name
   (`BrandLogoAssetId` / `BrandLogoFileName`). Eye visibility is the layer's ordinary per-scene `IsVisible`.
 - Default placement: top-left (32,32), 240x120 master px.
+- **Properties panel typography (2026-11-01):** one hierarchy for every section, defined in
+  `Themes/Controls.xaml` — `PropertyHeader` (category: 11px semibold, `Brush.OnSurface`, the
+  brightest text), `PropertySubHeader` (a field label inside it: 10px semibold, indented 10,
+  `OnSurfaceVariant`), `PropertyFieldLabel` (a label sharing a row with its control: same
+  typography, vertically centred, no margin), `PropertyHint` (the explanatory sentence: 10px,
+  wrapped, dim). Colour carries the grouping — bright for the thing being edited, dim for its
+  labels and help — and no new palette entries were needed. ⛔ No literal hex in the panel: the
+  four `#888`/`#666`/`#555` values that had crept in are now `OnSurfaceVariant` /
+  `OnSurfaceDisabled`. ⛔ **Every checkbox in the properties panel is a pill switch**
+  (`PropertyPillCheck`, 32×16 track with an animated thumb) — a 14px box reads as a form, a switch
+  reads as a setting; `IsChecked` semantics are untouched so all bindings still work.