ol {
  list-style-type: none;
}

ol li {
  text-indent: -2em;
  padding: 0;
  counter-increment: cnt;
}

ol li:before {
  display: marker;
  content: '(' counter(cnt) ') ';
}

ol li ul li {
  list-style-type: none;
  text-indent: -2em;
  padding: 0;
  counter-increment: innnerCnt;
}

ol li ul li:before {
  display: marker;
  content: '・';
}