.article-left {
  float: left;
  width: 300px;
}

.article-left h3 {
  font-size: 22px;
  display: block;
  color: #fff;
  height: 50px;
  line-height: 50px;
  padding: 0 0 0 20px;
  background: var(--color-primary);
  position: relative;
}

.article-left h3::after {
  display: none;
  font-family: "qico";
  content: "\e727";
  position: absolute;
  top: 5px;
  right: 0;
  width: 40px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  font-size: 20px;
  -webkit-transition: -webkit-transform .3s ease;
  transition: -webkit-transform .3s ease;
  transition: transform .3s ease;
  transition: transform .3s ease, -webkit-transform .3s ease;
}

.article-left h3.active::after {
  -webkit-transform: rotate(45deg) scale(1.08);
  -ms-transform: rotate(45deg) scale(1.08);
  transform: rotate(45deg) scale(1.08);
}


.sidenav {
  margin: 0 0 15px 0;
}

.sidenav ul {}

.sidenav ul li {
  position: relative;
  line-height: 20px;
  border: 1px solid #e2e2e2;
  margin: 5px 0 0 0;
  padding: 10px 40px 10px 20px;
}

.sidenav ul li::after {
  font-family: "qico";
  content: "\e62e";
  position: absolute;
  right: 10px;
  top: 0;
  font-size: 18px;
  font-weight: normal;
  line-height: 42px;
}

.sidenav ul li a {
  color: #555;
  font-size: 17px;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}

.sidenav ul li.active a,
.sidenav ul li.active::after {
  color: var(--color-primary);
}


@media screen and (max-width:1330px) {
  .article-left {
    width: 260px;
  }
}

@media screen and (max-width:768px) {
  .article-left {
    float: none;
    width: 100%;
  }

  .article-left h3 {
    font-size: 18px;
    padding: 0 0 0 15px;
  }

  .article-left h3::after {
    display: block;
  }

  .sidenav ul {
    display: none;
  }

  .sidenav ul li {
    margin: 3px 0 0;
    padding: 8px 40px 8px 15px;
  }

  .sidenav ul li::after {
    line-height: 38px;
  }

  .sidenav ul li a {
    font-size: 15px;
  }
}