function OTPForm({ index, value, onChange, inputRef, isError }) {
  return (
    <input
      ref={inputRef}
      value={value}
      maxLength={1}
      onChange={(e) => {
        const val = e.target.value;
        if (/^\d?$/.test(val)) {
          onChange(index, val);
        }
      }}
      onKeyDown={(e) => {
        if (e.key === "Backspace" && !e.target.value) {
          onChange(index, "backspace");
        }
      }}
      className={`border otp-field border-solid border-[#ADB5BD] rounded-[6px] text-center transition-all duration-500 ease-out
        outline-none focus:!border-[1px] focus:!border-solid focus:!border-[#5559CE]
        focus:!outline-[1px] focus:!outline-solid focus:!outline-[#5559CE] bg-transparent text-[#525252]
        w-[43px] h-[43px] sm:w-[45px] sm:h-[45px] md:w-[47px] md:h-[47px] lg:w-[48px] lg:h-[48px] 
        ${value && "!border-[1px] !border-solid !border-[#5559CE]"}
        ${isError && "!border-[#d32f2f]"}`}
    />
  );
}

export default OTPForm;