diff --git a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml
index c823618..8c310bd 100644
--- a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml
+++ b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml
@@ -29,15 +29,25 @@
                           Foreground="White"
                           VerticalAlignment="Center"/>
 
-                <Button Grid.Column="1"
-                       x:Name="ClearLogButton"
-                       Content="Clear"
-                       Background="Transparent"
-                       Foreground="White"
-                       BorderBrush="White"
-                       BorderThickness="1"
-                       Padding="8,2"
-                       Click="ClearLogButton_Click"/>
+                <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="5">
+                    <Button x:Name="CopyLogButton"
+                           Content="Copy"
+                           Background="LightGreen"
+                           Foreground="DarkGreen"
+                           BorderThickness="0"
+                           Padding="8,2"
+                           CornerRadius="3"
+                           Click="CopyLogButton_Click"/>
+
+                    <Button x:Name="ClearLogButton"
+                           Content="Clear"
+                           Background="Yellow"
+                           Foreground="DarkBlue"
+                           BorderThickness="0"
+                           Padding="8,2"
+                           CornerRadius="3"
+                           Click="ClearLogButton_Click"/>
+                </StackPanel>
             </Grid>
         </Border>
 
@@ -53,15 +63,16 @@
                     <DataTemplate>
                         <Border Margin="2"
                                Padding="8,4"
-                               Background="White"
                                BorderBrush="LightGray"
                                BorderThickness="1"
-                               CornerRadius="3">
+                               CornerRadius="3"
+                               Loaded="LogBorder_Loaded">
                             <TextBlock Text="{Binding}"
                                       FontFamily="Consolas"
                                       FontSize="12"
                                       TextWrapping="Wrap"
-                                      Foreground="Black"/>
+                                      Foreground="Black"
+                                      x:Name="LogTextBlock"/>
                         </Border>
                     </DataTemplate>
                 </ItemsControl.ItemTemplate>
diff --git a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.cpp b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.cpp
index 878c543..9bb9dec 100644
--- a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.cpp
+++ b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.cpp
@@ -8,6 +8,7 @@ using namespace winrt;
 using namespace winrt::Microsoft::UI::Xaml;
 using namespace winrt::Microsoft::UI::Xaml::Controls;
 using namespace winrt::Windows::Foundation;
+using namespace winrt::Windows::ApplicationModel::DataTransfer;
 using namespace winrt::Windows::Foundation::Collections;
 using namespace std::chrono;
 
@@ -40,6 +41,69 @@ namespace winrt::Vav2Player::implementation
         }
     }
 
+    void LogMessagePage::CopyLogButton_Click(IInspectable const&, RoutedEventArgs const&)
+    {
+        try
+        {
+            std::wstring allLogText;
+
+            // Collect all log messages from the UI collection
+            {
+                std::lock_guard<std::mutex> lock(m_uiUpdateMutex);
+
+                for (uint32_t i = 0; i < m_logCollection.Size(); ++i)
+                {
+                    if (auto logString = m_logCollection.GetAt(i).try_as<winrt::hstring>())
+                    {
+                        allLogText += logString->c_str();
+                        allLogText += L"\r\n"; // Windows line ending for clipboard
+                    }
+                }
+            }
+
+            if (!allLogText.empty())
+            {
+                // Remove the last line ending
+                if (allLogText.length() >= 2)
+                {
+                    allLogText = allLogText.substr(0, allLogText.length() - 2);
+                }
+
+                // Copy to clipboard using Windows API
+                if (OpenClipboard(NULL))
+                {
+                    EmptyClipboard();
+
+                    size_t len = (allLogText.length() + 1) * sizeof(wchar_t);
+                    HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len);
+
+                    if (hMem != NULL)
+                    {
+                        wchar_t* pMem = static_cast<wchar_t*>(GlobalLock(hMem));
+                        if (pMem != NULL)
+                        {
+                            wcscpy_s(pMem, allLogText.length() + 1, allLogText.c_str());
+                            GlobalUnlock(hMem);
+                            SetClipboardData(CF_UNICODETEXT, hMem);
+                        }
+                    }
+
+                    CloseClipboard();
+                }
+
+                // Logs copied to clipboard - no need to log this action
+            }
+            else
+            {
+                // No log messages to copy - no need to log this
+            }
+        }
+        catch (...)
+        {
+            // Failed to copy logs - no need to log this error
+        }
+    }
+
     void LogMessagePage::ClearLogButton_Click(IInspectable const&, RoutedEventArgs const&)
     {
         // Clear logs in LogManager (single source of truth)
@@ -52,8 +116,7 @@ namespace winrt::Vav2Player::implementation
             LogCountText().Text(L"0 messages");
         } // Release mutex before logging to avoid deadlock
 
-        // Log the clear action (called after releasing mutex to prevent deadlock)
-        ::Vav2Player::LogManager::GetInstance().LogInfo(L"Log cleared by user", L"LogMessagePage");
+        // Log cleared - no need to log this action
     }
 
     void LogMessagePage::AutoScrollCheckBox_CheckedChanged(IInspectable const& sender, RoutedEventArgs const&)
@@ -251,4 +314,52 @@ namespace winrt::Vav2Player::implementation
             default:                return L"UNKNOWN";
         }
     }
+
+    void LogMessagePage::SetLogItemBackground(uint32_t index, LogLevel level)
+    {
+        // This approach doesn't work well with ItemsControl template system.
+        // Instead, we'll modify the approach to use a custom DataTemplate with binding.
+        // For now, we'll skip the background coloring and implement a simpler solution.
+
+        // TODO: Implement background coloring using a different approach
+    }
+
+    void LogMessagePage::LogBorder_Loaded(IInspectable const& sender, RoutedEventArgs const&)
+    {
+        try
+        {
+            if (auto border = sender.try_as<Microsoft::UI::Xaml::Controls::Border>())
+            {
+                // Find the TextBlock child to get the log text
+                if (auto textBlock = border.Child().try_as<Microsoft::UI::Xaml::Controls::TextBlock>())
+                {
+                    auto logText = std::wstring(textBlock.Text().c_str());
+
+                    // Check log level in the text and set background color accordingly
+                    if (logText.find(L"ERROR:") != std::wstring::npos)
+                    {
+                        // Light red background for ERROR logs (#FFE4E1)
+                        border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(
+                            Microsoft::UI::ColorHelper::FromArgb(255, 255, 228, 225)));
+                    }
+                    else if (logText.find(L"WARN:") != std::wstring::npos)
+                    {
+                        // Light yellow background for WARNING logs (#FFFACD)
+                        border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(
+                            Microsoft::UI::ColorHelper::FromArgb(255, 255, 250, 205)));
+                    }
+                    else
+                    {
+                        // White background for other log levels
+                        border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(
+                            Microsoft::UI::Colors::White()));
+                    }
+                }
+            }
+        }
+        catch (...)
+        {
+            // Ignore errors in background color setting
+        }
+    }
 }
\ No newline at end of file
diff --git a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.h b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.h
index dcd0b8b..78898cb 100644
--- a/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.h
+++ b/vav2/Vav2Player/Vav2Player/LogMessagePage.xaml.h
@@ -15,15 +15,27 @@ namespace winrt::Vav2Player::implementation
     using LogLevel = ::Vav2Player::LogLevel;
     using LogMessage = ::Vav2Player::LogMessage;
 
+    // UI wrapper for log messages with visual styling information
+    struct LogMessageUI
+    {
+        std::wstring text;
+        LogLevel level;
+        bool isError() const { return level == LogLevel::Error; }
+        bool isWarning() const { return level == LogLevel::Warning; }
+        bool isInfo() const { return level == LogLevel::Info || level == LogLevel::Debug; }
+    };
+
     struct LogMessagePage : LogMessagePageT<LogMessagePage>
     {
         LogMessagePage();
         ~LogMessagePage();
 
         // Event handlers
+        void CopyLogButton_Click(Windows::Foundation::IInspectable const& sender, Microsoft::UI::Xaml::RoutedEventArgs const& e);
         void ClearLogButton_Click(Windows::Foundation::IInspectable const& sender, Microsoft::UI::Xaml::RoutedEventArgs const& e);
         void AutoScrollCheckBox_CheckedChanged(Windows::Foundation::IInspectable const& sender, Microsoft::UI::Xaml::RoutedEventArgs const& e);
         void LogLevelFilterComboBox_SelectionChanged(Windows::Foundation::IInspectable const& sender, Microsoft::UI::Xaml::Controls::SelectionChangedEventArgs const& e);
+        void LogBorder_Loaded(Windows::Foundation::IInspectable const& sender, Microsoft::UI::Xaml::RoutedEventArgs const& e);
 
         // Observer pattern - LogMessagePage subscribes to LogManager updates
         void InitializeLogObserver();
@@ -39,6 +51,7 @@ namespace winrt::Vav2Player::implementation
         bool ShouldShowMessage(LogLevel level) const;
         std::wstring GetLogLevelString(LogLevel level) const;
         std::wstring FormatLogMessageForUI(const ::Vav2Player::LogMessage& message) const;
+        void SetLogItemBackground(uint32_t index, LogLevel level);
 
         // UI state
         LogLevel m_currentFilter = LogLevel::Debug; // Show all by default
diff --git a/vav2/Vav2Player/Vav2Player/MainWindow.xaml b/vav2/Vav2Player/Vav2Player/MainWindow.xaml
index 234193d..7fd5e22 100644
--- a/vav2/Vav2Player/Vav2Player/MainWindow.xaml
+++ b/vav2/Vav2Player/Vav2Player/MainWindow.xaml
@@ -36,16 +36,21 @@
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="*"/>
                 <ColumnDefinition Width="Auto"/>
-                <ColumnDefinition Width="300" x:Name="LogPanelColumn"/>
+                <ColumnDefinition Width="400" x:Name="LogPanelColumn"/>
             </Grid.ColumnDefinitions>
 
             <!-- Content Area with Frame for navigation -->
             <Frame Grid.Column="0" x:Name="ContentFrame" Background="Black"/>
 
-            <!-- Splitter -->
-            <Border Grid.Column="1" x:Name="SplitterBorder" Width="5" Background="Gray"
+            <!-- Drag-based Splitter -->
+            <Border Grid.Column="1" x:Name="SplitterBorder" Width="8" Background="DarkGray"
                    PointerPressed="Splitter_PointerPressed"
-                   PointerMoved="Splitter_PointerMoved" PointerReleased="Splitter_PointerReleased"/>
+                   PointerMoved="Splitter_PointerMoved"
+                   PointerReleased="Splitter_PointerReleased"
+                   PointerEntered="Splitter_PointerEntered"
+                   PointerExited="Splitter_PointerExited">
+                <ToolTipService.ToolTip>Drag to resize log panel</ToolTipService.ToolTip>
+            </Border>
 
             <!-- Log Message Panel -->
             <Border Grid.Column="2" x:Name="LogPanelBorder" BorderBrush="Gray" BorderThickness="1,0,0,0">
diff --git a/vav2/Vav2Player/Vav2Player/MainWindow.xaml.cpp b/vav2/Vav2Player/Vav2Player/MainWindow.xaml.cpp
index 78cbfcb..1de4eb6 100644
--- a/vav2/Vav2Player/Vav2Player/MainWindow.xaml.cpp
+++ b/vav2/Vav2Player/Vav2Player/MainWindow.xaml.cpp
@@ -4,6 +4,7 @@
 #include "MultiVideoPage.xaml.h"
 #include "LayeredVideoPage.xaml.h"
 #include "src/Logger/LogManager.h"
+#include <microsoft.ui.xaml.window.h>
 #if __has_include("MainWindow.g.cpp")
 #include "MainWindow.g.cpp"
 #endif
@@ -96,33 +97,46 @@ namespace winrt::Vav2Player::implementation
 
             if (isChecked)
             {
-                // Show log panel
-                LogPanelColumn().Width(GridLength(300));
+                // Show log panel with default width
+                LogPanelColumn().Width(GridLength(400));
                 LogPanelBorder().Visibility(Visibility::Visible);
-                SplitterBorder().Visibility(Visibility::Visible);
             }
             else
             {
                 // Hide log panel
                 LogPanelColumn().Width(GridLength(0));
                 LogPanelBorder().Visibility(Visibility::Collapsed);
-                SplitterBorder().Visibility(Visibility::Collapsed);
             }
 
-            ::Vav2Player::LogManager::GetInstance().LogInfo(isChecked ? L"Log panel shown" : L"Log panel hidden", L"MainWindow");
+            // Log panel visibility toggled - no need to log this
         }
     }
 
+    // Drag-based splitter implementation
     void MainWindow::Splitter_PointerPressed(winrt::Windows::Foundation::IInspectable const&, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e)
     {
-        m_isDraggingSplitter = true;
-        // Simplified for now - disable detailed pointer tracking
-        m_lastPointerX = 0.0;
-
+        // Capture pointer first to ensure we receive subsequent events
         if (auto border = SplitterBorder())
         {
             border.CapturePointer(e.Pointer());
+            border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(Microsoft::UI::Colors::CornflowerBlue()));
         }
+
+        // Set drag state after capturing pointer
+        m_isDraggingSplitter = true;
+
+        // Store initial panel width
+        m_initialPanelWidth = LogPanelColumn().Width().Value;
+
+        // Store initial screen mouse position using Windows API
+        POINT screenPoint;
+        GetCursorPos(&screenPoint);
+        m_lastMouseX = static_cast<double>(screenPoint.x);
+
+        // Mark event as handled to prevent bubbling
+        e.Handled(true);
+
+        // Splitter drag started - no need to log drag events
     }
 
     void MainWindow::Splitter_PointerMoved(winrt::Windows::Foundation::IInspectable const&, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e)
@@ -130,8 +144,28 @@ namespace winrt::Vav2Player::implementation
         if (!m_isDraggingSplitter)
             return;
 
-        // Simplified for now - no detailed pointer tracking
-        // Just maintain current log panel width
+        // Get current screen mouse position using Windows API
+        POINT currentScreenPoint;
+        GetCursorPos(&currentScreenPoint);
+        double currentMouseX = static_cast<double>(currentScreenPoint.x);
+
+        // Calculate relative mouse movement delta
+        double deltaX = currentMouseX - m_lastMouseX;
+        m_lastMouseX = currentMouseX;
+
+        // Get current panel width and apply delta
+        auto currentWidth = LogPanelColumn().Width().Value;
+        double newWidth = currentWidth + deltaX;
+
+        // Set only minimum limit (no maximum limit)
+        const double MIN_WIDTH = 200.0;
+        newWidth = std::max(MIN_WIDTH, newWidth);
+
+        // Update panel width immediately for natural dragging
+        LogPanelColumn().Width(GridLength(newWidth));
+
+        // Mark event as handled
+        e.Handled(true);
     }
 
     void MainWindow::Splitter_PointerReleased(winrt::Windows::Foundation::IInspectable const&, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e)
@@ -140,10 +174,35 @@ namespace winrt::Vav2Player::implementation
         {
             m_isDraggingSplitter = false;
 
+            // Release pointer capture
             if (auto border = SplitterBorder())
             {
                 border.ReleasePointerCapture(e.Pointer());
+                border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(Microsoft::UI::Colors::LightGray()));
             }
+
+            // Splitter drag completed - no need to log resize events
+
+            // Mark event as handled
+            e.Handled(true);
+        }
+    }
+
+    void MainWindow::Splitter_PointerEntered(winrt::Windows::Foundation::IInspectable const&, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const&)
+    {
+        // Highlight on hover
+        if (auto border = SplitterBorder())
+        {
+            border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(Microsoft::UI::Colors::LightGray()));
+        }
+    }
+
+    void MainWindow::Splitter_PointerExited(winrt::Windows::Foundation::IInspectable const&, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const&)
+    {
+        // Reset to default color
+        if (auto border = SplitterBorder())
+        {
+            border.Background(Microsoft::UI::Xaml::Media::SolidColorBrush(Microsoft::UI::Colors::DarkGray()));
         }
     }
 
diff --git a/vav2/Vav2Player/Vav2Player/MainWindow.xaml.h b/vav2/Vav2Player/Vav2Player/MainWindow.xaml.h
index 9331401..af68704 100644
--- a/vav2/Vav2Player/Vav2Player/MainWindow.xaml.h
+++ b/vav2/Vav2Player/Vav2Player/MainWindow.xaml.h
@@ -23,10 +23,12 @@ namespace winrt::Vav2Player::implementation
         // Log panel handlers
         void ShowLogToggle_Click(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::RoutedEventArgs const& e);
 
-        // Splitter handlers
+        // Drag-based splitter handlers
         void Splitter_PointerPressed(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e);
         void Splitter_PointerMoved(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e);
         void Splitter_PointerReleased(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e);
+        void Splitter_PointerEntered(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e);
+        void Splitter_PointerExited(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& e);
 
         // 성능 최적화된 비디오 렌더링 함수들
         static void ConvertYUVToBGRA(const VavCoreVideoFrame& yuv_frame, uint8_t* bgra_buffer, uint32_t width, uint32_t height);
@@ -37,7 +39,8 @@ namespace winrt::Vav2Player::implementation
 
     private:
         bool m_isDraggingSplitter = false;
-        double m_lastPointerX = 0.0;
+        double m_initialPanelWidth = 0.0;
+        double m_lastMouseX = 0.0;
         winrt::Vav2Player::LogMessagePage m_logPanel{nullptr};
     };
 }
diff --git a/vav2/todo7.txt b/vav2/todo7.txt
index 4aba142..f8f5fa6 100644
--- a/vav2/todo7.txt
+++ b/vav2/todo7.txt
@@ -4,14 +4,9 @@ amd decoder 를 탑재해야해.
 -> nvidia 
 
 
-player UI 개선
-* webm 파일을 읽어서 av1 코덱이 아니면, 지원하지 않는 코덱이라고 텍스트 로그를 출력.
-
-UI 화면/버튼, 폰트 크기를 재조정. 메뉴바 크기를 재조정.
-
-
 android player 를 만들어서 av1 디코딩 테스트 필요.
 
+
 IAdaptiveVideoDecoder.h 인터페이스가 정말로 필요한 것일까? 재검토를 해봐줘.
 
 
@@ -20,5 +15,7 @@ CLAUDE.md 파일을 확인하여 현재 작업 상황을 점검하고 완료된
 완료된 사항만 간단하게 적어주고, 불필요한 정보들은 최대한 줄여줘.
 
 
-● Now I understand. The VavCoreVideoFrame doesn't have a color_space field, and we need to update the MainWindow files
-   to use VavCoreVideoFrame instead of the old VideoFrame. Let me fix these issues:
+player UI 화면/버튼, 폰트 크기를 재조정. 메뉴바 크기를 재조정.
+
+
+VavCoreVideoFrame 에는 color_space 변수가 없다. 차후에 이것을 사용할 기능이 들어가게 될까?