diff --git a/dist/README.txt b/dist/README.txt
index f2e3e2e..45689cb 100644
--- a/dist/README.txt
+++ b/dist/README.txt
@@ -1,5 +1,5 @@
 UbisamBase 플랫폼 배포 폴더 (빌드할 때 자동 생성 - 직접 고치지 마세요)
-갱신 시각 : 2026-09-21 22:17:54
+갱신 시각 : 2026-09-21 22:26:56
 빌드 구성 : Release
 원본 소스 : D:\업무\03_개발\Source\용접기\08_UbisamPlatform\
 ----
diff --git a/dist/UbisamBase.Core.dll b/dist/UbisamBase.Core.dll
index b311abf..3aa85c1 100644
Binary files a/dist/UbisamBase.Core.dll and b/dist/UbisamBase.Core.dll differ
diff --git a/dist/UbisamBase.Launcher.exe b/dist/UbisamBase.Launcher.exe
index 9980dd4..31f1f29 100644
Binary files a/dist/UbisamBase.Launcher.exe and b/dist/UbisamBase.Launcher.exe differ
diff --git a/dist/UbisamBase.Shell.exe b/dist/UbisamBase.Shell.exe
index 8ff640a..4f2e26d 100644
Binary files a/dist/UbisamBase.Shell.exe and b/dist/UbisamBase.Shell.exe differ
diff --git a/dist/platform-version.json b/dist/platform-version.json
index af90d0a..71e6d80 100644
--- a/dist/platform-version.json
+++ b/dist/platform-version.json
@@ -1,4 +1,4 @@
 {
-"version": "2026-09-21 22:17:54",
+"version": "2026-09-21 22:26:56",
 "configuration": "Release"
 }
diff --git a/src/UbisamBase.Launcher/UpdateDialog.xaml b/src/UbisamBase.Launcher/UpdateDialog.xaml
index 097f686..bcffdc4 100644
--- a/src/UbisamBase.Launcher/UpdateDialog.xaml
+++ b/src/UbisamBase.Launcher/UpdateDialog.xaml
@@ -1,7 +1,7 @@
 <Window x:Class="UbisamBase.Launcher.UpdateDialog"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        Width="440"
+        Width="460"
         SizeToContent="Height"
         WindowStyle="None"
         ResizeMode="NoResize"
@@ -10,37 +10,52 @@
         WindowStartupLocation="CenterScreen"
         FontFamily="Barlow, Segoe UI"
         FontSize="14"
+        MouseLeftButtonDown="Window_MouseLeftButtonDown"
         PreviewKeyDown="Window_PreviewKeyDown">
 
-    <!-- Core의 MessageDialog와 같은 생김새지만 리소스를 공유하지 않는다 — Launcher가 Core를 참조하면
-         갱신 대상인 Core.dll을 먼저 물고 있게 되어 덮어쓸 수 없기 때문이다(PlatformUpdater 주석 참고).
-         그래서 색은 코드비하인드가 시스템 테마(밝게/어둡게)에 맞춰 직접 넣는다. -->
+    <!-- 제목줄 없이 한 판으로 가고, 위쪽 accent 띠 하나로 플랫폼 창임을 표시한다.
+         Core의 리소스를 쓸 수 없어(참조하면 갱신 대상 Core.dll을 물게 된다) 색은 코드비하인드가
+         시스템 테마(밝게/어둡게)에 맞춰 직접 넣는다. -->
     <Window.Resources>
-        <!-- 버튼: 채움색·글자색은 코드에서 넣고, 여기서는 모양과 hover 반응만 정의한다. -->
-        <Style x:Key="DialogButton" TargetType="Button">
-            <Setter Property="MinWidth" Value="84"/>
-            <Setter Property="Padding" Value="14,7"/>
-            <Setter Property="BorderThickness" Value="1"/>
+        <Style x:Key="PrimaryButton" TargetType="Button">
+            <Setter Property="MinWidth" Value="104"/>
+            <Setter Property="Padding" Value="16,9"/>
             <Setter Property="Cursor" Value="Hand"/>
+            <Setter Property="FontWeight" Value="SemiBold"/>
             <Setter Property="Template">
                 <Setter.Value>
                     <ControlTemplate TargetType="Button">
-                        <Border x:Name="Bd"
-                                Background="{TemplateBinding Background}"
-                                BorderBrush="{TemplateBinding BorderBrush}"
-                                BorderThickness="{TemplateBinding BorderThickness}"
-                                CornerRadius="6"
-                                SnapsToDevicePixels="True">
-                            <ContentPresenter HorizontalAlignment="Center"
-                                              VerticalAlignment="Center"
-                                              Margin="{TemplateBinding Padding}"/>
+                        <Border x:Name="Bd" Background="{TemplateBinding Background}" CornerRadius="7" SnapsToDevicePixels="True">
+                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{TemplateBinding Padding}"/>
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Bd" Property="Opacity" Value="0.85"/>
+                                <Setter TargetName="Bd" Property="Opacity" Value="0.88"/>
                             </Trigger>
                             <Trigger Property="IsPressed" Value="True">
-                                <Setter TargetName="Bd" Property="Opacity" Value="0.7"/>
+                                <Setter TargetName="Bd" Property="Opacity" Value="0.72"/>
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+
+        <!-- 보조 동작은 테두리 없는 글자 버튼 — 눈이 "업데이트" 쪽으로 먼저 가게 한다. -->
+        <Style x:Key="QuietButton" TargetType="Button">
+            <Setter Property="MinWidth" Value="84"/>
+            <Setter Property="Padding" Value="14,9"/>
+            <Setter Property="Cursor" Value="Hand"/>
+            <Setter Property="Background" Value="Transparent"/>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="Button">
+                        <Border x:Name="Bd" Background="{TemplateBinding Background}" CornerRadius="7" SnapsToDevicePixels="True">
+                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{TemplateBinding Padding}"/>
+                        </Border>
+                        <ControlTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="True">
+                                <Setter TargetName="Bd" Property="Background" Value="{Binding QuietHoverBrush, RelativeSource={RelativeSource AncestorType=Window}}"/>
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
@@ -51,81 +66,77 @@
 
     <Border x:Name="RootBorder" BorderThickness="1">
         <DockPanel>
+            <!-- 위쪽 accent 띠 -->
+            <Border x:Name="AccentStrip" DockPanel.Dock="Top" Height="3"/>
 
-            <!-- 제목줄: 끌어서 창 이동 -->
-            <Border x:Name="TitleBar"
-                    DockPanel.Dock="Top"
-                    BorderThickness="0,0,0,1"
-                    Padding="16,10"
-                    MouseLeftButtonDown="TitleBar_MouseLeftButtonDown">
-                <TextBlock x:Name="TitleText" Text="UbisamBase 업데이트" FontWeight="SemiBold"/>
-            </Border>
+            <StackPanel Margin="26,24,26,20">
 
-            <!-- 버튼줄: 예가 주 동작(accent 채움), 아니오가 보조(외곽선) -->
-            <Border x:Name="ButtonBar"
-                    DockPanel.Dock="Bottom"
-                    BorderThickness="0,1,0,0"
-                    Padding="16,12">
-                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
-                    <Button x:Name="NoButton"
-                            Content="나중에"
-                            Style="{StaticResource DialogButton}"
-                            Margin="0,0,8,0"
-                            Click="No_Click"/>
-                    <Button x:Name="YesButton"
-                            Content="업데이트"
-                            Style="{StaticResource DialogButton}"
-                            IsDefault="True"
-                            Click="Yes_Click"/>
+                <!-- 제목줄: 아이콘 칩 + 제목/한 줄 설명 -->
+                <StackPanel Orientation="Horizontal">
+                    <Border x:Name="IconChip" Width="44" Height="44" CornerRadius="22" VerticalAlignment="Top" Margin="0,0,16,0">
+                        <!-- 아래로 내려받는 화살표 -->
+                        <Path x:Name="IconPath"
+                              Data="M12,4 L12,14.5 M7.2,10 L12,15 L16.8,10 M5.5,19 L18.5,19"
+                              Width="22" Height="22"
+                              Stretch="Uniform"
+                              StrokeThickness="1.7"
+                              StrokeStartLineCap="Round"
+                              StrokeEndLineCap="Round"
+                              StrokeLineJoin="Round"
+                              HorizontalAlignment="Center"
+                              VerticalAlignment="Center"/>
+                    </Border>
+
+                    <StackPanel VerticalAlignment="Center">
+                        <TextBlock x:Name="HeadlineText"
+                                   Text="새 버전이 준비됐습니다"
+                                   FontFamily="Barlow Condensed, Segoe UI"
+                                   FontSize="21"
+                                   FontWeight="SemiBold"/>
+                        <TextBlock x:Name="SubText"
+                                   Text="플랫폼을 최신으로 바꾼 뒤 실행합니다."
+                                   FontSize="13"
+                                   Margin="0,3,0,0"/>
+                    </StackPanel>
                 </StackPanel>
-            </Border>
 
-            <!-- 본문: 아이콘 + 안내문 + 버전 비교 -->
-            <Grid Margin="20,20">
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="Auto"/>
-                    <ColumnDefinition Width="*"/>
-                </Grid.ColumnDefinitions>
+                <!-- 버전 비교: 지금 → 새것 -->
+                <Border x:Name="VersionBox" CornerRadius="8" Padding="16,13" Margin="0,20,0,0">
+                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
+                        <StackPanel>
+                            <TextBlock x:Name="CurrentLabel" Text="지금" FontSize="11" HorizontalAlignment="Center"/>
+                            <TextBlock x:Name="CurrentValue" FontSize="13" Margin="0,3,0,0" HorizontalAlignment="Center"/>
+                        </StackPanel>
 
-                <Path x:Name="IconPath"
-                      Grid.Column="0"
-                      Data="M3,12 A9,9 0 0 1 21,12 A9,9 0 0 1 3,12 Z M9.3,9.3 A2.7,2.7 0 1 1 13.3,12.6 C12.5,13.1 12,13.6 12,14.8 M12,17.4 L12,17.5"
-                      Width="24" Height="24"
-                      StrokeThickness="1.5"
-                      StrokeStartLineCap="Round"
-                      StrokeEndLineCap="Round"
-                      StrokeLineJoin="Round"
-                      VerticalAlignment="Top"
-                      Margin="0,0,14,0"/>
+                        <Path x:Name="ArrowPath"
+                              Data="M4,10 L18,10 M13,5.5 L18,10 L13,14.5"
+                              Width="22" Height="20"
+                              Stretch="Uniform"
+                              StrokeThickness="1.6"
+                              StrokeStartLineCap="Round"
+                              StrokeEndLineCap="Round"
+                              StrokeLineJoin="Round"
+                              Margin="18,10,18,0"
+                              VerticalAlignment="Center"/>
 
-                <StackPanel Grid.Column="1">
-                    <TextBlock x:Name="HeadlineText"
-                               Text="새 플랫폼 버전이 있습니다."
-                               TextWrapping="Wrap"
-                               Margin="0,0,0,14"/>
+                        <StackPanel>
+                            <TextBlock x:Name="NewLabel" Text="새 버전" FontSize="11" HorizontalAlignment="Center"/>
+                            <TextBlock x:Name="NewValue" FontSize="13" FontWeight="SemiBold" Margin="0,3,0,0" HorizontalAlignment="Center"/>
+                        </StackPanel>
+                    </StackPanel>
+                </Border>
 
-                    <Grid>
-                        <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="Auto"/>
-                            <ColumnDefinition Width="*"/>
-                        </Grid.ColumnDefinitions>
-                        <Grid.RowDefinitions>
-                            <RowDefinition Height="Auto"/>
-                            <RowDefinition Height="Auto"/>
-                        </Grid.RowDefinitions>
+                <TextBlock x:Name="FootnoteText"
+                           Text="나중에를 누르면 이번에는 지금 버전으로 실행하고, 다음에 다시 물어봅니다."
+                           FontSize="12"
+                           TextWrapping="Wrap"
+                           Margin="2,14,0,0"/>
 
-                        <TextBlock x:Name="CurrentLabel" Grid.Row="0" Grid.Column="0" Text="지금 버전" Margin="0,0,14,4"/>
-                        <TextBlock x:Name="CurrentValue" Grid.Row="0" Grid.Column="1" Margin="0,0,0,4"/>
-                        <TextBlock x:Name="NewLabel" Grid.Row="1" Grid.Column="0" Text="새 버전" Margin="0,0,14,0"/>
-                        <TextBlock x:Name="NewValue" Grid.Row="1" Grid.Column="1" FontWeight="SemiBold"/>
-                    </Grid>
-
-                    <TextBlock x:Name="FootnoteText"
-                               Text="지금 받으면 새 버전으로 실행합니다. 나중에를 누르면 이번에는 그대로 실행하고, 다음에 다시 물어봅니다."
-                               TextWrapping="Wrap"
-                               Margin="0,14,0,0"/>
+                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,22,0,0">
+                    <Button x:Name="NoButton" Content="나중에" Style="{StaticResource QuietButton}" Margin="0,0,8,0" Click="No_Click"/>
+                    <Button x:Name="YesButton" Content="지금 업데이트" Style="{StaticResource PrimaryButton}" IsDefault="True" Click="Yes_Click"/>
                 </StackPanel>
-            </Grid>
+            </StackPanel>
         </DockPanel>
     </Border>
 </Window>
diff --git a/src/UbisamBase.Launcher/UpdateDialog.xaml.cs b/src/UbisamBase.Launcher/UpdateDialog.xaml.cs
index 0fe9705..04bf4d6 100644
--- a/src/UbisamBase.Launcher/UpdateDialog.xaml.cs
+++ b/src/UbisamBase.Launcher/UpdateDialog.xaml.cs
@@ -7,11 +7,11 @@ using Microsoft.Win32;
 namespace UbisamBase.Launcher;
 
 /// <summary>
-/// "새 버전이 있습니다 — 지금 받을까요?" 대화상자. 플랫폼(Core)의 MessageDialog와 같은 생김새지만,
-/// Launcher는 Core를 참조하지 않으므로(참조하면 갱신 대상인 Core.dll을 물고 있게 된다) 색을 직접 넣는다.
+/// "새 버전이 준비됐습니다 — 지금 받을까요?" 대화상자.
 ///
-/// 테마는 윈도우 설정(밝게/어둡게)을 따라간다 — 이 시점에는 아직 앱의 UI 설정을 읽을 수 없기 때문이다.
-/// 색 값은 Core의 Colors.Dark.xaml / Colors.Light.xaml에서 같은 이름으로 가져온 것이다.
+/// 플랫폼(Core)의 색·글꼴을 따르되 리소스는 공유하지 않는다 — Launcher가 Core를 참조하면 갱신
+/// 대상인 Core.dll을 물고 있게 되어 덮어쓸 수 없기 때문이다. 그래서 색을 여기서 직접 넣는다.
+/// 테마는 윈도우 설정(밝게/어둡게)을 따른다. 이 시점에는 아직 앱의 UI 설정을 읽을 수 없다.
 /// </summary>
 public partial class UpdateDialog : Window
 {
@@ -25,50 +25,52 @@ public partial class UpdateDialog : Window
         ApplyTheme(IsSystemLightTheme());
     }
 
-    /// <summary>대화상자를 띄우고 "업데이트"를 눌렀는지 돌려준다.</summary>
+    /// <summary>보조 버튼에 마우스를 올렸을 때 깔리는 색. 템플릿에서 바인딩해 쓴다.</summary>
+    public Brush QuietHoverBrush { get; private set; } = Brushes.Transparent;
+
+    /// <summary>대화상자를 띄우고 "지금 업데이트"를 눌렀는지 돌려준다.</summary>
     public static bool Ask(string currentVersion, string newVersion)
         => new UpdateDialog(currentVersion, newVersion).ShowDialog() == true;
 
     private void ApplyTheme(bool light)
     {
         // Colors.Light.xaml / Colors.Dark.xaml 과 같은 값.
-        var background = Color(light ? "#FFF2F2F3" : "#FF23262B");
-        var foreground = Color(light ? "#FF1D1F20" : "#FFE8EAED");
-        var panel = Color(light ? "#FFFFFFFF" : "#FF2A2E34");
-        var border = Color(light ? "#FFD6D6D9" : "#FF3A3F47");
-        var muted = Color(light ? "#FF98989B" : "#FF8A9099");
-        var accentFill = Color(light ? "#FF1D82E8" : "#FF1E7FD4");
-        var onAccent = Color(light ? "#FFFFFFFF" : "#FFF2F7FC");
+        var background = Brush(light ? "#FFFFFFFF" : "#FF2A2E34");
+        var foreground = Brush(light ? "#FF1D1F20" : "#FFE8EAED");
+        var border = Brush(light ? "#FFD6D6D9" : "#FF3A3F47");
+        var muted = Brush(light ? "#FF98989B" : "#FF8A9099");
+        var accent = Brush(light ? "#FF2196F3" : "#FF4DA6F5");
+        var accentFill = Brush(light ? "#FF1D82E8" : "#FF1E7FD4");
+        var onAccent = Brush(light ? "#FFFFFFFF" : "#FFF2F7FC");
+        var sunken = Brush(light ? "#FFF2F2F3" : "#FF23262B");
+        var chip = Brush(light ? "#142196F3" : "#1F4DA6F5");
 
         Background = background;
         Foreground = foreground;
         RootBorder.BorderBrush = border;
+        AccentStrip.Background = accent;
 
-        TitleBar.Background = panel;
-        TitleBar.BorderBrush = border;
-        TitleText.Foreground = foreground;
+        IconChip.Background = chip;
+        IconPath.Stroke = accent;
 
-        ButtonBar.Background = panel;
-        ButtonBar.BorderBrush = border;
-
-        IconPath.Stroke = foreground;
         HeadlineText.Foreground = foreground;
+        SubText.Foreground = muted;
+
+        VersionBox.Background = sunken;
         CurrentLabel.Foreground = muted;
-        NewLabel.Foreground = muted;
         CurrentValue.Foreground = muted;
+        ArrowPath.Stroke = accent;
+        NewLabel.Foreground = muted;
         NewValue.Foreground = foreground;
         FootnoteText.Foreground = muted;
 
         YesButton.Background = accentFill;
-        YesButton.BorderBrush = accentFill;
         YesButton.Foreground = onAccent;
-
-        NoButton.Background = Brushes.Transparent;
-        NoButton.BorderBrush = border;
-        NoButton.Foreground = foreground;
+        NoButton.Foreground = muted;
+        QuietHoverBrush = sunken;
     }
 
-    private static SolidColorBrush Color(string hex)
+    private static SolidColorBrush Brush(string hex)
         => new SolidColorBrush((Color)ColorConverter.ConvertFromString(hex));
 
     /// <summary>윈도우가 밝은 테마인지. Core의 UiSettingsService.IsSystemLightTheme과 같은 판정이다.</summary>
@@ -87,7 +89,8 @@ public partial class UpdateDialog : Window
         }
     }
 
-    private void TitleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) => DragMove();
+    /// <summary>제목줄이 없으므로 창 아무 데나 끌어서 옮길 수 있게 한다.</summary>
+    private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) => DragMove();
 
     private void Yes_Click(object sender, RoutedEventArgs e) => DialogResult = true;