@media only screen and (max-width: 960px) {
  nav {
    height: 50px;
    padding: 0 5%;
    box-sizing: border-box;
    font-size: 16px;
  }

  .pcNavBox {
    width: 100%;
    height: 50px;
  }

  .mobileNavIcon {
    display: block;
  }

  .pcNavBar {
    display: inherit;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    margin-top: 0;
    background: #fff;
    border-top: 1px solid #eee;
  }

  .pcLogo {
    width: 100%;
    height: 50px;
    text-align: center;
  }

  .pcLogo img {
    height: 30px;
    width: auto;
    margin-top: 10px;
  }

  /* 这里把第二个隐藏 是为了移动端展示关于我们 */

  /* .pcNavBar li:nth-child(2), */
  /* .pcNavBar li:nth-child(4), */
  /* .pcNavBar li:nth-child(5), */
  .pcNavBar li:nth-child(6),
  .pcNavBar li:nth-child(7),
  .pcNavBar li:nth-child(8),
  .pcNavBar li:nth-child(9) {
    display: none;
  }

  .pcNavBar li {
    width: 100%;
    height: 50px;
    background: #fff;
    border-bottom: none;
    line-height: 50px;
  }

  .pcNavBar li.current {
    background: #fff;
  }

  .pcNavBar li:nth-child(1) a:before {
    content: "";
    display: block;
    width: 23px;
    height: 20px;
    background: url(../images/homeIcon.png) 0 0 / cover;
    margin: 5px auto 0;
  }

  .pcNavBar li:nth-child(2) a:before {
    content: "";
    display: block;
    width: 23px;
    height: 20px;
    background: url(../images/profileIcon.png) 0 0 / cover;
    margin: 5px auto 0;
  }

  .pcNavBar li:nth-child(3) a:before {
    content: "";
    display: block;
    width: 23px;
    height: 20px;
    background: url(../images/classIcon.png) 0 0 / cover;
    margin: 5px auto 0;
  }
  .pcNavBar li:nth-child(4) a:before {
    content: "";
    display: block;
    width: 23px;
    height: 20px;
    background: url(../images/downloadIcon.png) 0 0 / cover;
    margin: 5px auto 0;
  }
  .pcNavBar li:nth-child(5) a:before {
    content: "";
    display: block;
    width: 20px;
    height: 20px;
    background: url(../images/productIcon.png) 0 0 / cover;
    margin: 5px auto 0;
  }
  .pcNavBar li a {
    color: #9e9e9e;
    font-size: 14px;
    display: block;
    height: 50px;
    line-height: 26px;
  }

  .pcNavBar li a.active,
  .pcNavBar li a:hover {
    width: 100%;
    height: 50px;
    background: #fff;
    border-radius: 0;
    color: #f6684d;
    display: block;
    margin: 0 auto;
    line-height: 26px;
    font-size: 14px;
  }

  .pcNavBar li:nth-child(1) a.active:before {
    background: url(../images/homeIcon.png) 0 -20px / cover;
  }
  .pcNavBar li:nth-child(2) a.active:before {
    background: url(../images/profileIcon.png) 0 -20px / cover;
  }
  .pcNavBar li:nth-child(3) a.active:before {
    background: url(../images/classIcon.png) 0 -20px / cover;
  }
  .pcNavBar li:nth-child(4) a.active:before {
    background: url(../images/downloadIcon.png) 0 -20px / cover;
  }
  .mobileNavIcon {
    width: 40px;
    height: 40px;
    display: block;
    background: url(../images/mobileNavMenu.png) no-repeat;
    background-size: cover;
    margin-top: 12px;
  }

  .mobileNavIcon.current {
    width: 30px;
    height: 30px;
    background: url(../images/mobileNavShut.png) no-repeat;
    background-size: cover;
    margin-top: 18px;
  }

  /* 小标题 */

  .baseTitleCon {
    padding: 30px 0 15px;
  }

  .baseTitleCon h2 {
    font-size: 24px;
    color: #444;
  }

  .baseTitleCon p {
    margin-top: 5px;
    font-size: 16px;
  }

  /* 课程体系小标题 */
  .baseSysTitle {
    font-size: 24px;
    padding: 30px 0 30px;
    text-align: center;
    box-sizing: border-box;
    color: #444;
  }

  /* 关于我们 */
  .aboutUsTopImg {
    min-width: auto;
  }

  /* footer */
  .footer {
    margin-bottom: 50px;
    min-width: auto;
  }

  .footerBox {
    width: 100%;
    padding: 0 5%;
    box-sizing: border-box;
  }

  .footerWrap {
    width: 65%;
  }

  .footer h6 {
    display: none;
  }

  .con {
    border: none;
  }
  .code p {
    display: none;
  }

  .footerWrap:nth-child(2) {
    display: none;
  }

  .footerWrap:last-child {
    text-align: center;
    width: 35%;
    padding: 0;
  }
}

@media only screen and (max-width: 450px) {
  .footer h5 {
    margin-bottom: 20px;
  }
  .con p {
    margin-top: 10px;
  }
  .footerBox {
    padding: 0 3%;
  }
  .footer h5 {
    font-size: 16px;
  }
  .footerWrap {
    width: 80%;
  }
  .con > img {
    width: 70px;
  }
}