.ct-container{max-width:640px;margin:auto;padding:20px}
.ct-progress{height:6px;background:#eee;margin-bottom:20px}
.ct-bar{height:6px;background:#000;width:0;transition:width .2s ease}
.ct-option{display:block;padding:14px;margin:8px 0;border:1px solid #ddd;cursor:pointer}
.ct-option.active{border-color:#000;background:#f5f5f5}
.ct-nav{display:flex;justify-content:space-between;margin-top:20px}