Dark Mode

import 'package:flutter/material.dart';

class DarkModeApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // Configure the Dark Theme
      themeMode: ThemeMode.dark,
      darkTheme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: const Color(0xFF121212), // Standard dark background
        cardColor: const Color(0xFF1E1E1E), // Elevated surface
        colorScheme: const ColorScheme.dark().copyWith(
          primary: const Color(0xFFBB86FC), // Desaturated accent
          onPrimary: Colors.black, // Dark text on light accent
          surface: const Color(0xFF1E1E1E),
        ),
      ),
      home: Scaffold(
        appBar: AppBar(title: const Text('Dark Mode', style: TextStyle(color: Colors.white70))),
        body: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            Card(
              elevation: 0, // Shadows don't show well anyway
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12),
                side: BorderSide(color: Colors.white.withOpacity(0.05)), // Subtle border
              ),
              child: const Padding(
                padding: EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text('Elevation via Lightness', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                    SizedBox(height: 8),
                    Text('Elevated surfaces use lighter greys.', style: TextStyle(color: Colors.white60)),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: () {},
              child: const Text('Desaturated Accent'),
            ),
          ],
        ),
      ),
    );
  }
}

import { useColorScheme } from 'react-native';

const DarkModeScreen = () => {
  const isDark = useColorScheme() === 'dark';
  
  // Custom dark theme dictionary
  const theme = {
    bgBase: isDark ? '#121212' : '#FFFFFF',
    bgElevated: isDark ? '#1E1E1E' : '#F5F5F5',
    textHigh: isDark ? 'rgba(255, 255, 255, 0.87)' : 'rgba(0, 0, 0, 0.87)',
    textMedium: isDark ? 'rgba(255, 255, 255, 0.60)' : 'rgba(0, 0, 0, 0.60)',
    accent: isDark ? '#BB86FC' : '#6200EE', // Desaturated for dark, vibrant for light
    onAccent: isDark ? '#000' : '#FFF',
  };

  return (
    <View style={{ flex: 1, backgroundColor: theme.bgBase, padding: 16 }}>
      <View style={{
        backgroundColor: theme.bgElevated,
        padding: 24,
        borderRadius: 12,
        borderWidth: isDark ? 1 : 0,
        borderColor: 'rgba(255,255,255,0.05)',
        marginBottom: 20
      }}>
        <Text style={{ color: theme.textHigh, fontSize: 18, fontWeight: 'bold', marginBottom: 8 }}>
          Elevation via Lightness
        </Text>
        <Text style={{ color: theme.textMedium }}>
          Elevated surfaces use lighter greys.
        </Text>
      </View>

      <TouchableOpacity style={{
        backgroundColor: theme.accent,
        padding: 16,
        borderRadius: 8,
        alignItems: 'center'
      }}>
        <Text style={{ color: theme.onAccent, fontWeight: 'bold' }}>Desaturated Accent</Text>
      </TouchableOpacity>
    </View>
  );
};

@Composable
fun DarkModeScreen() {
    // Typically this logic lives in your Theme.kt
    val darkColors = darkColorScheme(
        background = Color(0xFF121212),
        surface = Color(0xFF1E1E1E),
        primary = Color(0xFFBB86FC),
        onPrimary = Color.Black,
        onBackground = Color.White.copy(alpha = 0.87f),
        onSurface = Color.White.copy(alpha = 0.87f)
    )

    MaterialTheme(colorScheme = darkColors) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .background(MaterialTheme.colorScheme.background)
                .padding(16.dp)
        ) {
            Card(
                colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface),
                shape = RoundedCornerShape(12.dp),
                border = BorderStroke(1.dp, Color.White.copy(alpha = 0.05f))
            ) {
                Column(modifier = Modifier.padding(24.dp)) {
                    Text("Elevation via Lightness", 
                        style = MaterialTheme.typography.titleMedium, 
                        color = MaterialTheme.colorScheme.onSurface)
                    Spacer(Modifier.height(8.dp))
                    Text("Elevated surfaces use lighter greys.", 
                        style = MaterialTheme.typography.bodyMedium, 
                        color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f))
                }
            }
            
            Spacer(Modifier.height(20.dp))
            
            Button(
                onClick = {},
                colors = ButtonDefaults.buttonColors(
                    containerColor = MaterialTheme.colorScheme.primary,
                    contentColor = MaterialTheme.colorScheme.onPrimary
                ),
                modifier = Modifier.fillMaxWidth().height(50.dp)
            ) {
                Text("Desaturated Accent", fontWeight = FontWeight.Bold)
            }
        }
    }
}