diff --git a/makespec/BUILDVERSION b/makespec/BUILDVERSION
index 864d5650..c48f9e04 100644
--- a/makespec/BUILDVERSION
+++ b/makespec/BUILDVERSION
@@ -1 +1 @@
-268
+269
diff --git a/src/base/settings.cpp b/src/base/settings.cpp
index ec6d00cf..fba3e3ce 100644
--- a/src/base/settings.cpp
+++ b/src/base/settings.cpp
@@ -54,6 +54,15 @@ QColor ColorTheme::getColorNf() const { return colorNf; }
 
 QColor ColorTheme::getColorCe() const { return colorCe; }
 
+void ColorTheme::invertLightness() {
+	mxColor.l = 100 - mxColor.l;
+	miColor.l = 100 - miColor.l;
+	nfColor.l = 100 - nfColor.l;
+	ceColor.l = 100 - ceColor.l;
+	colorNf = nfColor.toHsl();
+	colorCe = ceColor.toHsl();
+}
+
 void ColorTheme::copyFrom(ColorTheme *others) {
 	setName(others->getName());
 	setColor(others->getMxColor(), others->getMiColor(), others->getNfColor(), others->getCeColor(),
@@ -131,7 +140,7 @@ auto Settings::getCompilerList() const -> const QList<Compiler *> & { return com
 
 const QList<ColorTheme *> &Settings::getColorThemeList() const { return colorThemeList; }
 
-const ColorTheme *Settings::getCurrentColorTheme() const { return colorThemeList[currentColorTheme]; }
+ColorTheme Settings::getCurrentColorTheme() const { return *colorThemeList[currentColorTheme]; }
 
 auto Settings::getUiLanguage() const -> const QString & { return uiLanguage; }
 
diff --git a/src/base/settings.h b/src/base/settings.h
index bb56f4a3..84702318 100644
--- a/src/base/settings.h
+++ b/src/base/settings.h
@@ -59,8 +59,14 @@ class ColorTheme {
 	QColor getColorPer(double, double) const;
 	QColor getColorGrand(double, double) const;
 
+	void invertLightness();
+
   private:
 	QString name;
+	// mxColor maxColor
+	// miColor minColor
+	// nfColor nofileColor
+	// ceColor compileErrorColor
 	hslTuple mxColor, miColor, nfColor, ceColor;
 	QColor colorNf, colorCe;
 	dddTuple grandComp, grandRate;
@@ -116,7 +122,7 @@ class Settings {
 	void addColorTheme(ColorTheme *);
 	void deleteColorTheme(int);
 	ColorTheme *getColorTheme(int);
-	const ColorTheme *getCurrentColorTheme() const;
+	ColorTheme getCurrentColorTheme() const;
 	int getCurrentColorThemeIndex() const;
 
 	void setColorTheme(ColorTheme *, int);
diff --git a/src/component/exportutil/exportutil.cpp b/src/component/exportutil/exportutil.cpp
index 47aba669..aebc7dc0 100644
--- a/src/component/exportutil/exportutil.cpp
+++ b/src/component/exportutil/exportutil.cpp
@@ -217,9 +217,8 @@ auto ExportUtil::getContestantHtmlCode(Contest *contest, Contestant *contestant,
  */
 void ExportUtil::exportHtml(QWidget *widget, Contest *contest, const QString &fileName) {
 	Settings settings;
-	const ColorTheme *colors;
 	contest->copySettings(settings);
-	colors = settings.getCurrentColorTheme();
+	ColorTheme colors = settings.getCurrentColorTheme();
 
 	QFile file(fileName);
 
@@ -343,7 +342,7 @@ void ExportUtil::exportHtml(QWidget *widget, Contest *contest, const QString &fi
 			double s = NAN;
 			double l = NAN;
 #endif
-			colors->getColorGrand(allScore, sfullScore).getHslF(&h, &s, &l);
+			colors.getColorGrand(allScore, sfullScore).getHslF(&h, &s, &l);
 			h *= 360, s *= 100, l *= 100;
 			out << QString("<td class=\"td-2\" style=\"background: hsl(%2,%3%,%4%); border: 2px solid "
 			               "hsl(%2,%3%,%5%);\">%1</td>")
@@ -369,15 +368,15 @@ void ExportUtil::exportHtml(QWidget *widget, Contest *contest, const QString &fi
 				double s = NAN;
 				double l = NAN;
 #endif
-				QColor col = colors->getColorPer(score, fullScore[j]);
+				QColor col = colors.getColorPer(score, fullScore[j]);
 				col.getHslF(&h, &s, &l);
 
 				if (taskList[j]->getTaskType() != Task::AnswersOnly &&
 				    contestant->getCompileState(j) != CompileSuccessfully) {
 					if (contestant->getCompileState(j) == NoValidSourceFile) {
-						colors->getColorNf().getHslF(&h, &s, &l);
+						colors.getColorNf().getHslF(&h, &s, &l);
 					} else {
-						colors->getColorCe().getHslF(&h, &s, &l);
+						colors.getColorCe().getHslF(&h, &s, &l);
 					}
 				}
 
diff --git a/src/resultviewer.cpp b/src/resultviewer.cpp
index 27f2f5d4..c6c160ad 100644
--- a/src/resultviewer.cpp
+++ b/src/resultviewer.cpp
@@ -25,6 +25,7 @@
 #include <QHeaderView>
 #include <QMenu>
 #include <QMessageBox>
+#include <QtGlobal>
 #include <algorithm>
 
 #define LEMON_MODULE_NAME "ResultViewer"
@@ -107,8 +108,14 @@ void ResultViewer::refreshViewer() {
 	QList<Task *> taskList = curContest->getTaskList();
 	Settings setting;
 	curContest->copySettings(setting);
-	const ColorTheme *colors = setting.getCurrentColorTheme();
+	ColorTheme colors = setting.getCurrentColorTheme();
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+	if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark) {
+		colors.invertLightness();
+		LOG("Auto dark mode has been set");
+	}
+#endif
 	for (auto &i : taskList) {
 		headerList << i->getProblemTitle();
 	}
@@ -144,11 +151,11 @@ void ResultViewer::refreshViewer() {
 				if (taskList[j]->getTaskType() != Task::AnswersOnly &&
 				    contestantList[i]->getCompileState(j) != CompileSuccessfully) {
 					if (contestantList[i]->getCompileState(j) == NoValidSourceFile)
-						bg = colors->getColorNf();
+						bg = colors.getColorNf();
 					else
-						bg = colors->getColorCe();
+						bg = colors.getColorCe();
 				} else
-					bg = colors->getColorPer(score, fullScore[j]);
+					bg = colors.getColorPer(score, fullScore[j]);
 
 				item(i, j + 3)->setBackground(bg);
 
@@ -166,7 +173,7 @@ void ResultViewer::refreshViewer() {
 
 		if (totalScore != -1) {
 			item(i, 2)->setData(Qt::DisplayRole, totalScore);
-			item(i, 2)->setBackground(colors->getColorGrand(totalScore, sfullScore));
+			item(i, 2)->setBackground(colors.getColorGrand(totalScore, sfullScore));
 			QFont font;
 			font.setBold(true);
 			item(i, 2)->setFont(font);