fix: different dark themes for mobile and desktop

lib/src/theme.dart

@@ -12,8 +12,15 @@ bool get _isMobile =>
 typedef ThemePair = ({ThemeData lightTheme, ThemeData darkTheme});
 
 const _lightBase = Colors.white;
-final _darkBase = Colors.black.scale(lightness: 0.04);
-final _darkMenuBase = Colors.black.scale(lightness: 0.08);
+final _darkBaseDesktop = Colors.black.scale(lightness: 0.09);
+final _darkBaseMobile = Colors.black.scale(lightness: 0.04);
+
+final _darkBase = _isMobile ? _darkBaseMobile : _darkBaseDesktop;
+
+final _darkMenuBaseDesktop = Colors.black.scale(lightness: 0.07);
+final _darkMenuBaseMobile = Colors.black.scale(lightness: 0.08);
+final _darkMenuBase = _isMobile ? _darkMenuBaseMobile : _darkMenuBaseDesktop;
+
 const _kContainerRadius = 10.0;
 const _kDesktopButtonHeight = 42.0;
 const _kMobileButtonHeight = 48.0;
@@ -186,7 +193,9 @@ CardTheme _cardTheme(ColorScheme colorScheme) {
 
 Color _cardColor(ColorScheme colorScheme) {
   return colorScheme.surface.scale(
-    lightness: colorScheme.isLight ? -0.06 : 0.08,
+    lightness: _isMobile
+        ? (colorScheme.isLight ? -0.06 : 0.08)
+        : (colorScheme.isLight ? -0.06 : 0.05),
   );
 }