diff --git a/CMakeLists.txt b/CMakeLists.txt
index 91ca9a9..4c831ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@ set (CMAKE_AUTOUIC ON)
 
 find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
 
-set (QT_MINIMUM_VERSION "6.4")
+set (QT_MINIMUM_VERSION "6.5")
 
 find_package(Qt${QT_VERSION_MAJOR} ${QT_MINIMUM_VERSION} REQUIRED
     COMPONENTS Widgets Svg SvgWidgets LinguistTools
diff --git a/app/bottombuttongroup.cpp b/app/bottombuttongroup.cpp
index 2e5dd49..d0b44d4 100644
--- a/app/bottombuttongroup.cpp
+++ b/app/bottombuttongroup.cpp
@@ -15,35 +15,25 @@ BottomButtonGroup::BottomButtonGroup(const std::vector<QAction *> &actionList, Q
     mainLayout->setSizeConstraint(QLayout::SetFixedSize);
     this->setLayout(mainLayout);
     this->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
-    this->setStyleSheet("BottomButtonGroup {"
-                        "border: 1px solid gray;"
-                        "border-top-left-radius: 10px;"
-                        "border-top-right-radius: 10px;"
-                        "border-style: none;"
-                        "background-color:rgba(0,0,0,120)"
-                        "}"
-                        "QToolButton {"
-                        "background:transparent;"
-                        "}"
-                        "QToolButton:!focus {"
-                        "border-style: none;"
-                        "}");
+    this->setStyleSheet(R"#(
+BottomButtonGroup {
+    border-style: none;
+    background: transparent;
+}
+QToolButton {
+    background: transparent;
+    border-style: none;
+}
+)#");
 
-    auto newActionBtn = [this](QAction * action) -> QToolButton * {
+    for (QAction * action : actionList) {
+        // Create button
         QToolButton * btn = new QToolButton(this);
         btn->setDefaultAction(action);
         btn->setIconSize(QSize(32, 32));
         btn->setFixedSize(40, 40);
-        return btn;
-    };
-
-    for (QAction * action : actionList) {
-        addButton(newActionBtn(action));
+        // Add button
+        layout()->addWidget(btn);
     }
-}
-
-void BottomButtonGroup::addButton(QAbstractButton *button)
-{
-    layout()->addWidget(button);
     updateGeometry();
 }
diff --git a/app/bottombuttongroup.h b/app/bottombuttongroup.h
index c024598..99f4eb9 100644
--- a/app/bottombuttongroup.h
+++ b/app/bottombuttongroup.h
@@ -15,8 +15,6 @@ class BottomButtonGroup : public QGroupBox
     Q_OBJECT
 public:
     explicit BottomButtonGroup(const std::vector<QAction *> & actionList, QWidget *parent = nullptr);
-
-    void addButton(QAbstractButton *button);
 };
 
 #endif // BOTTOMBUTTONGROUP_H
diff --git a/app/graphicsscene.cpp b/app/graphicsscene.cpp
index 8abf68b..50df449 100644
--- a/app/graphicsscene.cpp
+++ b/app/graphicsscene.cpp
@@ -6,6 +6,9 @@
 
 #include "settings.h"
 
+#include <QStyleHints>
+#include <QOperatingSystemVersion>
+#include <QGuiApplication>
 #include <QGraphicsSceneMouseEvent>
 #include <QMimeData>
 #include <QDebug>
@@ -16,6 +19,33 @@
 #include <QMovie>
 #include <QPainter>
 
+static const QColor& ColorSchemaToTextForeground(Qt::ColorScheme colorScheme) {
+    // YYC MARK:
+    // If we are using Windows 10 and lower system or Qt which do not support "Windows 11"
+    // theme (lower than Qt 6.7), we should only support light mode.
+    // Because Qt's dark-mode-aware "Windows 11" theme is only well-supported on Windows 11.
+#if defined(Q_OS_WIN)
+#if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+    colorScheme = Qt::ColorScheme::Light;
+#else
+    if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows11) {
+        colorScheme = Qt::ColorScheme::Light;
+    }
+#endif // QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+#endif // defined(Q_OS_WIN)
+
+    switch (colorScheme) {
+    case Qt::ColorScheme::Dark:
+        static QColor WHITE = QColor("White");
+        return WHITE;
+    case Qt::ColorScheme::Light:
+    case Qt::ColorScheme::Unknown:
+    default:
+        static QColor BLACK = QColor("Black");
+        return BLACK;
+    }
+}
+
 class PGraphicsPixmapItem : public QGraphicsPixmapItem
 {
 public:
@@ -100,6 +130,7 @@ GraphicsScene::GraphicsScene(QObject *parent)
     : QGraphicsScene(parent)
 {
     showText(tr("Drag image here"));
+    connect(qGuiApp->styleHints(), &QStyleHints::colorSchemeChanged, this, &GraphicsScene::updateStyle);
 }
 
 GraphicsScene::~GraphicsScene()
@@ -121,7 +152,7 @@ void GraphicsScene::showText(const QString &text)
 {
     this->clear();
     QGraphicsTextItem * textItem = this->addText(text);
-    textItem->setDefaultTextColor(QColor("White"));
+    textItem->setDefaultTextColor(ColorSchemaToTextForeground(qGuiApp->styleHints()->colorScheme()));
     m_theThing = textItem;
     this->setSceneRect(m_theThing->boundingRect());
 }
@@ -206,3 +237,14 @@ QPixmap GraphicsScene::renderToPixmap()
 
     return pixmap;
 }
+
+void GraphicsScene::updateStyle(Qt::ColorScheme colorScheme) {
+    Q_UNUSED(colorScheme)
+
+    QGraphicsItem * item = this->m_theThing;
+    if (item == nullptr) return;
+    QGraphicsTextItem * textItem = qgraphicsitem_cast<QGraphicsTextItem*>(item);
+    if (textItem == nullptr) return;
+
+    textItem->setDefaultTextColor(ColorSchemaToTextForeground(colorScheme));
+}
diff --git a/app/graphicsscene.h b/app/graphicsscene.h
index 4ec3596..0716141 100644
--- a/app/graphicsscene.h
+++ b/app/graphicsscene.h
@@ -26,6 +26,9 @@ public:
 
     QPixmap renderToPixmap();
 
+public slots:
+    void updateStyle(Qt::ColorScheme colorScheme);
+
 private:
     QGraphicsItem * m_theThing = nullptr;
 };
diff --git a/app/graphicsview.cpp b/app/graphicsview.cpp
index 568a5f8..91c1ebc 100644
--- a/app/graphicsview.cpp
+++ b/app/graphicsview.cpp
@@ -7,6 +7,8 @@
 #include "graphicsscene.h"
 #include "settings.h"
 
+#include <QStyleHints>
+#include <QOperatingSystemVersion>
 #include <QDebug>
 #include <QColorSpace>
 #include <QMouseEvent>
@@ -23,11 +25,12 @@ GraphicsView::GraphicsView(QWidget *parent)
     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setResizeAnchor(QGraphicsView::AnchorUnderMouse);
     setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
-    setStyleSheet("background-color: rgba(0, 0, 0, 220);"
-                  "border-radius: 3px;");
     setAcceptDrops(false);
     setCheckerboardEnabled(false);
 
+    updateStyle(qGuiApp->styleHints()->colorScheme());
+    connect(qGuiApp->styleHints(), &QStyleHints::colorSchemeChanged, this, &GraphicsView::updateStyle);
+
     connect(horizontalScrollBar(), &QScrollBar::valueChanged, this, &GraphicsView::viewportRectChanged);
     connect(verticalScrollBar(), &QScrollBar::valueChanged, this, &GraphicsView::viewportRectChanged);
 }
@@ -344,6 +347,39 @@ void GraphicsView::toggleCheckerboard(bool invertCheckerboardColor)
     setCheckerboardEnabled(!m_checkerboardEnabled, invertCheckerboardColor);
 }
 
+void GraphicsView::updateStyle(Qt::ColorScheme colorScheme) {
+    // YYC MARK:
+    // If we are using Windows 10 and lower system or Qt which do not support "Windows 11"
+    // theme (lower than Qt 6.7), we should only support light mode.
+    // Because Qt's dark-mode-aware "Windows 11" theme is only well-supported on Windows 11.
+#if defined(Q_OS_WIN)
+#if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+    colorScheme = Qt::ColorScheme::Light;
+#else
+    if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows11) {
+        colorScheme = Qt::ColorScheme::Light;
+    }
+#endif // QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+#endif // defined(Q_OS_WIN)
+
+    switch (colorScheme) {
+    case Qt::ColorScheme::Dark:
+        setStyleSheet(R"#(
+border-style: none;
+background-color: black;
+)#");
+        break;
+    case Qt::ColorScheme::Light:
+    case Qt::ColorScheme::Unknown:
+    default:
+        setStyleSheet(R"#(
+border-style: none;
+background-color: white;
+)#");
+        break;
+    }
+}
+
 void GraphicsView::mousePressEvent(QMouseEvent *event)
 {
     if (shouldIgnoreMousePressMoveEvent(event)) {
diff --git a/app/graphicsview.h b/app/graphicsview.h
index f20d0ec..d314385 100644
--- a/app/graphicsview.h
+++ b/app/graphicsview.h
@@ -51,6 +51,7 @@ signals:
 
 public slots:
     void toggleCheckerboard(bool invertCheckerboardColor = false);
+    void updateStyle(Qt::ColorScheme colorScheme);
 
 private:
     void mousePressEvent(QMouseEvent * event) override;
diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index 9092f13..0153921 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -51,7 +51,6 @@ MainWindow::MainWindow(QWidget *parent)
     , m_pm(new PlaylistManager(this))
     , m_fileSystemWatcher(new QFileSystemWatcher(this))
 {
-    this->setAttribute(Qt::WA_TranslucentBackground, true);
     // YYC MARK:
     // Blumis set original value is 350 x 330.
     // It is too small for modern device,
diff --git a/app/navigatorview.cpp b/app/navigatorview.cpp
index 9a3cef7..d7caf5a 100644
--- a/app/navigatorview.cpp
+++ b/app/navigatorview.cpp
@@ -6,6 +6,8 @@
 
 #include "graphicsview.h"
 
+#include <QStyleHints>
+#include <QOperatingSystemVersion>
 #include <QMouseEvent>
 #include <QDebug>
 #include <QTimer>
@@ -16,8 +18,9 @@ NavigatorView::NavigatorView(QWidget *parent)
 {
     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    setStyleSheet("background-color: rgba(0, 0, 0, 120);"
-                  "border-radius: 3px;");
+
+    updateStyle(qGuiApp->styleHints()->colorScheme());
+    connect(qGuiApp->styleHints(), &QStyleHints::colorSchemeChanged, this, &NavigatorView::updateStyle);
 }
 
 // doesn't take or manage its ownership
@@ -38,6 +41,39 @@ void NavigatorView::updateMainViewportRegion()
     });
 }
 
+void NavigatorView::updateStyle(Qt::ColorScheme colorScheme) {
+    // YYC MARK:
+    // If we are using Windows 10 and lower system or Qt which do not support "Windows 11"
+    // theme (lower than Qt 6.7), we should only support light mode.
+    // Because Qt's dark-mode-aware "Windows 11" theme is only well-supported on Windows 11.
+#if defined(Q_OS_WIN)
+#if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+    colorScheme = Qt::ColorScheme::Light;
+#else
+    if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows11) {
+        colorScheme = Qt::ColorScheme::Light;
+    }
+#endif // QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
+#endif // defined(Q_OS_WIN)
+
+    switch (colorScheme) {
+    case Qt::ColorScheme::Dark:
+    setStyleSheet(R"#(
+border-style: none;
+background-color: rgba(255, 255, 255, 70);
+)#");
+        break;
+    case Qt::ColorScheme::Light:
+    case Qt::ColorScheme::Unknown:
+    default:
+        setStyleSheet(R"#(
+border-style: none;
+background-color: rgba(0, 0, 0, 70);
+)#");
+        break;
+    }
+}
+
 void NavigatorView::mousePressEvent(QMouseEvent *event)
 {
     m_mouseDown = true;
diff --git a/app/navigatorview.h b/app/navigatorview.h
index e3b894e..624fdbc 100644
--- a/app/navigatorview.h
+++ b/app/navigatorview.h
@@ -18,6 +18,7 @@ public:
 
 public slots:
     void updateMainViewportRegion();
+    void updateStyle(Qt::ColorScheme colorScheme);
 
 private:
     void mousePressEvent(QMouseEvent * event) override;