MainWindow.xaml

<Window x:Class="ColumnFinder.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="ColumnFinder" Height="680" Width="1180"
        Background="#F3F3F3" Foreground="#202020"
        FontFamily="Segoe UI" FontSize="13"
        Icon="pack://application:,,,/app.ico"
        xmlns:v="clr-namespace:ColumnFinder.Views">
    <Window.Resources>
        <Style TargetType="Button" x:Key="ToolBtn">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Padding" Value="8,4"/>
            <Setter Property="Margin" Value="2,0"/>
            <Setter Property="Cursor" Value="Hand"/>
        </Style>
        <Style TargetType="ListBoxItem" x:Key="SidebarItem">
            <Setter Property="Padding" Value="10,6"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Background" Value="Transparent"/>
        </Style>
    </Window.Resources>

    <DockPanel>
        <!-- 상단: 네비 + 주소창 + 검색 -->
        <Border DockPanel.Dock="Top" Background="#F3F3F3" BorderBrush="#E5E5E5" BorderThickness="0,0,0,1">
            <Grid Height="44">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="280"/>
                </Grid.ColumnDefinitions>

                <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center" Margin="8,0">
                    <Button Style="{StaticResource ToolBtn}" Click="Back_Click" ToolTip="뒤로">←</Button>
                    <Button Style="{StaticResource ToolBtn}" Click="Forward_Click" ToolTip="앞으로">→</Button>
                    <Button Style="{StaticResource ToolBtn}" Click="Up_Click" ToolTip="위로">↑</Button>
                    <Button Style="{StaticResource ToolBtn}" Click="Refresh_Click" ToolTip="새로고침">⟳</Button>
                </StackPanel>

                <Border Grid.Column="1" Background="White" BorderBrush="#D0D0D0" BorderThickness="1"
                        CornerRadius="4" Margin="4,8" Padding="8,0">
                    <v:Breadcrumb x:Name="AddressBar"/>
                </Border>

                <Border Grid.Column="2" Background="White" BorderBrush="#D0D0D0" BorderThickness="1"
                        CornerRadius="4" Margin="4,8,8,8" Padding="8,0">
                    <TextBox x:Name="SearchBox" BorderThickness="0" Background="Transparent"
                             VerticalAlignment="Center"
                             TextChanged="SearchBox_TextChanged"/>
                </Border>
            </Grid>
        </Border>

        <!-- 툴바 -->
        <Border DockPanel.Dock="Top" Background="#F3F3F3" BorderBrush="#E5E5E5" BorderThickness="0,0,0,1">
            <StackPanel Orientation="Horizontal" Margin="8,4" Height="32">
                <Button Style="{StaticResource ToolBtn}" Click="NewFolder_Click">+ 새로 만들기</Button>
                <Separator Margin="6,4" Background="#E0E0E0"/>
                <Button Style="{StaticResource ToolBtn}" Click="Cut_Click">잘라내기</Button>
                <Button Style="{StaticResource ToolBtn}" Click="Copy_Click">복사</Button>
                <Button Style="{StaticResource ToolBtn}" Click="Paste_Click">붙여넣기</Button>
                <Button Style="{StaticResource ToolBtn}" Click="Rename_Click">이름 바꾸기</Button>
                <Button Style="{StaticResource ToolBtn}" Click="Delete_Click">삭제</Button>
                <Separator Margin="6,4" Background="#E0E0E0"/>
                <Button Style="{StaticResource ToolBtn}" Click="Sort_Click">↕ 정렬</Button>
                <Popup x:Name="SortPopup" StaysOpen="False" Placement="Bottom" AllowsTransparency="True">
                    <Border Background="White" BorderBrush="#D0D0D0" BorderThickness="1" Padding="4">
                        <StackPanel>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="ModifiedDesc" Click="SortItem_Click">수정일 ↓ (최신순)</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="ModifiedAsc" Click="SortItem_Click">수정일 ↑ (오래된순)</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="NameAsc" Click="SortItem_Click">이름 A→Z</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="NameDesc" Click="SortItem_Click">이름 Z→A</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="SizeDesc" Click="SortItem_Click">크기 큰 순</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="SizeAsc" Click="SortItem_Click">크기 작은 순</Button>
                            <Button Style="{StaticResource ToolBtn}" HorizontalContentAlignment="Left" Tag="TypeAsc" Click="SortItem_Click">유형별</Button>
                        </StackPanel>
                    </Border>
                </Popup>
            </StackPanel>
        </Border>

        <!-- 하단 상태바 -->
        <Border DockPanel.Dock="Bottom" Background="#F3F3F3" BorderBrush="#E5E5E5" BorderThickness="0,1,0,0">
            <TextBlock x:Name="StatusBar" Margin="12,4" Text="0개 항목"/>
        </Border>

        <!-- 메인: 사이드바 + 컬럼 영역 -->
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="220"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <!-- 사이드바 -->
            <Border Grid.Column="0" Background="#FAFAFA" BorderBrush="#E5E5E5" BorderThickness="0,0,1,0">
                <ScrollViewer VerticalScrollBarVisibility="Auto">
                    <ListBox x:Name="Sidebar"
                             BorderThickness="0"
                             Background="Transparent"
                             ItemContainerStyle="{StaticResource SidebarItem}"
                             SelectionChanged="Sidebar_SelectionChanged">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <Image Source="{Binding Icon}" Width="16" Height="16" Margin="0,0,8,0"/>
                                    <TextBlock Text="{Binding Name}" VerticalAlignment="Center"/>
                                </StackPanel>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>
                </ScrollViewer>
            </Border>

            <!-- 컬럼뷰 -->
            <Grid Grid.Column="1" x:Name="ColumnsHost" Background="White"/>
        </Grid>
    </DockPanel>
</Window>