pub fn country_code_to_flag(code: &str) -> String {
    if code.len() != 2 {
        return "🏳".to_string();
    }

    code.to_uppercase()
        .chars()
        .map(|c| {
            // regional indicator symbols start at 0x1F1E6 ('A')
            char::from_u32(0x1F1E6 + (c as u32 - 'A' as u32)).unwrap_or('?')
        })
        .collect()
}