diff --git a/src/spectrogram.c b/src/spectrogram.c
index ac217d9..c0026f5 100644
--- a/src/spectrogram.c
+++ b/src/spectrogram.c
@@ -38,7 +38,12 @@
 #define BASE_WIDTH 1280
 #define BASE_HEIGHT 800
 
-// Get uniform scale factor based on current window size
+// Base resolution for proportional UI scaling.
+// GetUIScale() uses logical screen (not framebuffer) dimensions so that
+// layout stays based on window size alone. FLAG_WINDOW_HIGHDPI makes
+// BeginDrawing() render to the framebuffer at the correct resolution, so
+// every 1px drawn in layout coordinates automatically maps to the right
+// physical size on any monitor.
 static float GetUIScale(void)
 {
     float scaleX = (float)GetScreenWidth() / BASE_WIDTH;
@@ -1269,7 +1274,7 @@ static bool UpdateSlider(Rectangle bounds, float* value)
 
 int main(int argc, char* argv[])
 {
-    SetConfigFlags(FLAG_VSYNC_HINT | FLAG_WINDOW_RESIZABLE);
+    SetConfigFlags(FLAG_VSYNC_HINT | FLAG_WINDOW_RESIZABLE | FLAG_WINDOW_HIGHDPI);
     InitWindow(1280, 800, "Spectrogram Viewer");
     SetTargetFPS(60);
     SetTraceLogLevel(LOG_WARNING);  // Suppress INFO texture logs
@@ -1284,7 +1289,9 @@ int main(int argc, char* argv[])
 
     SearchAndSetResourceDir("resources");
 
-    // Load TTF font for crisp text at any scale
+    // Load TTF font at a fixed base size. Scaling is handled uniformly by
+    // GetUIScale() for both layout and DrawTextScaled(), so the font scales
+    // naturally with the window size on any DPI monitor.
     mainFont = LoadFontEx("fonts/DejaVuSansMono.ttf", 16, 0, 0);
     if (mainFont.texture.id == 0) {
         TraceLog(LOG_WARNING, "Failed to load TTF font, using default bitmap font");
@@ -1533,11 +1540,11 @@ int main(int argc, char* argv[])
         float selTopMargin = 50 * selScale;
         float selBottomMargin = 10 * selScale;
         
-        Rectangle selBounds = { 
-            selSidebarWidth + selFreqLabelWidth, 
-            selTopMargin, 
-            GetScreenWidth() - selSidebarWidth - selFreqLabelWidth - selVScrollbarWidth - 20, 
-            GetScreenHeight() - selTopMargin - selBottomMargin - selLabelHeight - selScrollbarHeight - 10 
+        Rectangle selBounds = {
+            selSidebarWidth + selFreqLabelWidth,
+            selTopMargin,
+            GetScreenWidth() - selSidebarWidth - selFreqLabelWidth - selVScrollbarWidth - 20.0f * selScale,
+            GetScreenHeight() - selTopMargin - selBottomMargin - selLabelHeight - selScrollbarHeight - 10.0f * selScale
         };
         Vector2 mousePos = GetMousePosition();