// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

/// @title MRStandardToken — Ownable ERC-20 with fixed supply minted to owner.
contract MRStandardToken is ERC20, Ownable {
    uint8 private immutable _customDecimals;

    constructor(
        string memory name_,
        string memory symbol_,
        uint256 totalSupply_,
        uint8 decimals_,
        address owner_
    ) ERC20(name_, symbol_) Ownable(owner_) {
        require(owner_ != address(0), "owner=0");
        _customDecimals = decimals_;
        _mint(owner_, totalSupply_);
    }

    function decimals() public view override returns (uint8) {
        return _customDecimals;
    }
}