MainWindow.xaml

<Window x:Class="SkyCopy.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="SkyCopy - Skydive Video Organizer"
        Icon="app.ico"
        Width="900" Height="650"
        MinWidth="750" MinHeight="550"
        WindowStartupLocation="CenterScreen"
        Background="#F0F0F0">

    <Window.Resources>
        <BooleanToVisibilityConverter x:Key="BoolToVis"/>
        <Style x:Key="HeaderLabel" TargetType="TextBlock">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="FontWeight" Value="SemiBold"/>
            <Setter Property="Margin" Value="0,0,0,4"/>
        </Style>
        <Style x:Key="FieldBox" TargetType="TextBox">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="Padding" Value="6,4"/>
            <Setter Property="Height" Value="32"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
        </Style>
        <Style x:Key="ComboFieldBox" TargetType="ComboBox">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="Padding" Value="6,4"/>
            <Setter Property="Height" Value="32"/>
            <Setter Property="IsEditable" Value="True"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
        </Style>
        <Style x:Key="ActionButton" TargetType="Button">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="Padding" Value="20,8"/>
            <Setter Property="Cursor" Value="Hand"/>
        </Style>
    </Window.Resources>

    <Grid Margin="16">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <!-- Title bar -->
        <Grid Grid.Row="0" Margin="0,0,0,12">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="✈ SkyCopy" FontSize="22" FontWeight="Bold" Foreground="#2D6DA4"/>
                <TextBlock Text=" — From Kapowsin to the World" FontSize="14" VerticalAlignment="Bottom" Margin="4,0,0,3" Foreground="#666"/>
            </StackPanel>
            <Button Grid.Column="1" Content="❓ Help" VerticalAlignment="Center"
                    FontSize="12" Padding="10,4" Background="#E0E0E0" BorderThickness="0" Cursor="Hand"
                    Click="HelpButton_Click" ToolTip="How to use SkyCopy"/>
        </Grid>

        <!-- Input fields -->
        <Grid Grid.Row="1" Margin="0,0,0,12">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="16"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="16"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="16"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>

            <StackPanel Grid.Column="0">
                <TextBlock Text="Date" Style="{StaticResource HeaderLabel}"/>
                <TextBox x:Name="DateField" Style="{StaticResource FieldBox}"/>
            </StackPanel>

            <StackPanel Grid.Column="2">
                <TextBlock Text="Jump Number" Style="{StaticResource HeaderLabel}"/>
                <TextBox x:Name="JumpNumberField" Style="{StaticResource FieldBox}"/>
            </StackPanel>

            <StackPanel Grid.Column="4">
                <TextBlock Text="Diver" Style="{StaticResource HeaderLabel}"/>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <ComboBox x:Name="DiverField" Grid.Column="0" Style="{StaticResource ComboFieldBox}"/>
                    <Button x:Name="RemoveDiverButton" Grid.Column="1" Content="✕" 
                            Width="24" Height="24" Margin="4,0,0,0"
                            FontSize="12" Padding="0" VerticalAlignment="Center"
                            ToolTip="Remove selected diver from presets"
                            Click="RemoveDiverButton_Click" Background="#E0E0E0" BorderThickness="0" Cursor="Hand"/>
                </Grid>
            </StackPanel>

            <Button Grid.Column="6" Content="⟳ Refresh" VerticalAlignment="Bottom" 
                    Style="{StaticResource ActionButton}"
                    Click="RefreshButton_Click" Height="32" Background="#E0E0E0"/>
        </Grid>

        <!-- File browser -->
        <Border Grid.Row="2" BorderBrush="#CCC" BorderThickness="1" CornerRadius="4" Background="White">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>

                <TreeView x:Name="FileTree" Grid.Column="0" BorderThickness="0" FontSize="13"
                          SelectedItemChanged="FileTree_SelectedItemChanged">
                    <TreeView.ItemTemplate>
                        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
                            <StackPanel Orientation="Horizontal" Margin="2">
                                <Image Source="{Binding Thumbnail}" Width="32" Height="32" Margin="0,0,6,0"
                                       Visibility="{Binding HasThumbnail, Converter={StaticResource BoolToVis}}"
                                       Stretch="Uniform" RenderOptions.BitmapScalingMode="HighQuality"/>
                                <TextBlock Text="{Binding Icon}" Margin="0,0,6,0" FontSize="14" VerticalAlignment="Center">
                                    <TextBlock.Style>
                                        <Style TargetType="TextBlock">
                                            <Style.Triggers>
                                                <DataTrigger Binding="{Binding HasThumbnail}" Value="True">
                                                    <Setter Property="Visibility" Value="Collapsed"/>
                                                </DataTrigger>
                                            </Style.Triggers>
                                        </Style>
                                    </TextBlock.Style>
                                </TextBlock>
                                <StackPanel VerticalAlignment="Center">
                                    <TextBlock Text="{Binding Name}"/>
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Text="{Binding SizeText}" Foreground="#999" FontSize="11"/>
                                        <TextBlock Text="{Binding CreatedTime}" Foreground="#BBB" FontSize="11" Margin="8,0,0,0"/>
                                    </StackPanel>
                                </StackPanel>
                            </StackPanel>
                        </HierarchicalDataTemplate>
                    </TreeView.ItemTemplate>
                </TreeView>

                <!-- Thumbnail preview panel -->
                <Border x:Name="PreviewPanel" Grid.Column="1" Width="180" BorderBrush="#DDD" BorderThickness="1,0,0,0"
                        Background="#FAFAFA" Visibility="Collapsed">
                    <StackPanel Margin="8" VerticalAlignment="Center" HorizontalAlignment="Center">
                        <Image x:Name="PreviewImage" Width="160" Height="120" Stretch="Uniform"
                               RenderOptions.BitmapScalingMode="HighQuality" Margin="0,0,0,8"/>
                        <TextBlock x:Name="PreviewFileName" TextWrapping="Wrap" FontSize="11"
                                   Foreground="#555" HorizontalAlignment="Center" TextAlignment="Center"/>
                        <TextBlock x:Name="PreviewFileInfo" FontSize="10" Foreground="#999"
                                   HorizontalAlignment="Center" Margin="0,4,0,0"/>
                    </StackPanel>
                </Border>

                <TextBlock x:Name="NoSdCardMessage" Grid.ColumnSpan="2"
                           Text="No SD card detected. Please insert an SD card and click Refresh."
                           HorizontalAlignment="Center" VerticalAlignment="Center"
                           FontSize="14" Foreground="#999"
                           Visibility="Visible"/>
            </Grid>
        </Border>

        <!-- Status bar & selected file -->
        <Grid Grid.Row="3" Margin="0,8,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <TextBlock Text="Selected: " FontWeight="SemiBold" VerticalAlignment="Center"/>
            <TextBlock x:Name="SelectedFileText" Grid.Column="1" Text="(none)" 
                       Foreground="#555" VerticalAlignment="Center" TextTrimming="CharacterEllipsis"/>
        </Grid>

        <!-- Download button & progress -->
        <Grid Grid.Row="4" Margin="0,10,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>

            <StackPanel Grid.Column="0" VerticalAlignment="Center">
                <ProgressBar x:Name="CopyProgress" Height="18" Visibility="Collapsed" Margin="0,0,16,0"/>
                <TextBlock x:Name="StatusText" Text="" Foreground="#2D6DA4" FontSize="12" Margin="0,4,0,0"/>
            </StackPanel>

            <Button x:Name="DownloadButton" Grid.Column="1"
                    Content="📥 Download" 
                    Style="{StaticResource ActionButton}"
                    Background="#2D6DA4" Foreground="White"
                    Click="DownloadButton_Click"
                    IsEnabled="False"
                    Height="40" MinWidth="140"/>
        </Grid>

        <!-- Footer credit -->
        <TextBlock Grid.Row="5" Text="by @gecaso based on @outcoldman original idea, credit to Denis" 
                   HorizontalAlignment="Right" Margin="0,8,0,0"
                   FontSize="11" Foreground="#999"/>
    </Grid>
</Window>