Platform-specific styles are applied (iOS subtle, Android material)

Material elevation shadows and ripple effects on iOS look foreign — users immediately read the app as cross-platform slop. iOS expects flat text buttons with subtle borders; Android expects filled buttons with elevation. Apple's HIG and Material Design 3 are explicit about these patterns, and mismatched styling is one of the top three signals App Store reviewers use to flag low-quality cross-platform apps during manual review.

Branch styles with Platform.select() or move the component into .ios.tsx / .android.tsx variants:

import { Platform, StyleSheet } from 'react-native';
const styles = StyleSheet.create({
  button: {
    padding: 12,
    ...Platform.select({
      ios: { backgroundColor: 'transparent', borderRadius: 8 },
      android: { backgroundColor: '#2196F3', elevation: 3, borderRadius: 4 },
    }),
  },
});

Apply the same split to cards, dividers, and navigation headers.