body header {
  /* width: 1900px;
  height: 48px;
  background: #ffffff;
  box-shadow: 3px 5px 6px 1px rgba(188, 188, 188, 0.14);

  margin: 0 auto;
  background: #f7f7f7; */
  width: 100%;
  display: flex;
  background: white;
  height: 50px;
  box-shadow: 3px 5px 6px 1px rgba(188, 188, 188, 0.14);
  position: relative;
  justify-content: space-between;
}
.tabs-content-.placeholde .top {
  font-size: 25px;
  color: #ff9e02;
  font-weight: 600;
  margin: 10px 20px;
  position: relative;
}
.tabs-content-.placeholde .top::before {
  position: absolute;
  content: "";
  width: 5px;
  height: 33px;
  background-color: #ff9e02;
  left: -15px;
  border-radius: 10px;
}
body header .top {
  display: flex;
  width: 1200px;
  justify-content: space-between;
  margin: 0 auto;
}
body header .left ul {
  margin-right: 0;
}
body header .right ul {
  margin-left: 0;
}
body header .right ul li a {
  font-size: 16px;
  font-weight: bold;
  color: #303030;
}
body header ul {
  display: flex;
  align-items: center;
}
body header ul li {
  line-height: 48px;
  width: 90px;
}
body header .right ul li {
  width: 50px;
}
body header .right ul li:first-child {
  width: 185px;
}
body header ul li a {
  font-size: 16px;
  font-weight: 400;
  display: flex;
  color: #1b1b1b;
  align-items: center;
  justify-content: flex-start;
}
body header ul li a img {
  width: 25px;
  height: 25px;
  margin-right: 6px;
}
body .header {
  display: none;
}
body .footer {
  display: none;
}
body .nav {
  width: 100%;
  height: 72px;
  background: #ffffff;

  margin-top: 10px;
  margin: 0 auto;
}
body .nav .left img {
  height: 36px;
}
body .nav .center {
  width: 547px;
  height: 31px;
  background: #f7f7f7;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 200px 0 240px;
}
body .nav .center p {
  width: 18px;
  height: 18px;
  background: #fe4848;
  border-radius: 6px;
  font-size: 15px;
  color: #ffffff;
  line-height: 18px;
  text-align: center;
}
body .nav .center ul {
  display: flex;
  width: 500px;
  overflow: hidden;
  background: 9px no-repeat #f7f7f7;
}
body .nav .center ul li {
  line-height: 31px;
  margin: 0 10px;
  white-space: nowrap;
}
body .nav .center ul li a {
  color: #000;
}
body .nav .right {
  width: 101px;
  height: 32px;
  background: #ff6a2a;
  border-radius: 16px;
  text-align: center;
}
body .nav .right a {
  font-size: 15px;
  font-weight: 400;
  color: #ffffff;
  line-height: 32px;
}
body .nav1 {
  display: none;
}
body .banner {
  width: 100%;
  overflow: hidden;
  margin: 0 auto;
}
body .banner .swiper {
  width: 100%;
  height: 100%;
  position: relative;
}
body .banner .swiper .swiper-pagination {
  bottom: 40px;
}
body .banner .swiper .swiper-pagination .swiper-pagination-bullet-active {
  background-color: #fe6d03;
}
body .banner .swiper .swiper-pagination-bullet {
  width: 19px;
  height: 5px;
  background: #fff;
  border-radius: 3px;
}
body .banner .swiper .swiper-slide {
  height: 100%;
  text-align: center;
  font-size: 18px;
  background: #fff;
  /* Center slide text vertically */
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}
body .banner .swiper .swiper-slide a img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
body .main .top ul {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1200px;
  margin: 0 auto;
}
body .main .top ul li {
  margin: 32px 5px 27px;
  width: 196px;
  height: 54px;
  background: #ffffff;
  border-radius: 6px;
  font-size: 18px;
  color: #313131;
  line-height: 54px;
  text-align: center;
}
body .main .top ul .active {
  width: 196px;
  height: 54px;
  background: #ff9e02;
  border-radius: 6px;
  color: #ffffff;
}
body .main .text {
  width: 1200px;
  margin: 0 auto;
}
body .main .text .placeholde ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
}
body .main .text .placeholde ul li {
  width: 353px;
  height: 400px;
  background-color: #fff;
  margin: 10px 0;
  border-radius: 10px 10px 0 0;
}
body .main .text .placeholde ul li:nth-child(3n-1) {
  margin: 10px 68px 10px 73px;
}
body .main .text .placeholde ul li img {
  height: 144px;
}
body .main .text .placeholde ul li p a {
  height: 72px;
  background: none;
  border-radius: 0;
  text-align: left;
  width: 291px;
  display: block;
  font-size: 16px;
  font-weight: 400;
  color: #1b1b1b;
  line-height: 24px;
  margin: 0 auto;
  margin-top: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}
body .main .text .placeholde ul li .heat {
  width: 315px;
  height: 45px;
  background: #f2f2f2;
  display: flex;
  align-items: center;
  padding: 0 29px;
  margin: 26px auto 20px;
}
body .main .text .placeholde ul li .heat p {
  margin: 0;
  font-size: 18px;
  width: 100px;
  font-weight: 600;
  color: #ff6633;
}
body .main .text .placeholde ul li .heat img {
  width: 19px;
  height: 19px;
  margin: 0 4px;
}
body .main .text .placeholde ul li a {
  display: block;
  width: 166px;
  height: 43px;
  background: #ff9e02;
  border-radius: 22px;
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  line-height: 43px;
  text-align: center;
  margin: 0 auto;
}
body .Related {
  width: 1200px;
  height: 300px;
  background: #ffffff;
  margin: 55px auto 64px;
}
body .Related .top {
  font-size: 25px;
  font-weight: bold;
  color: #1b1b1b;
  position: relative;
  margin: 0 40px;
  padding-top: 30px;
}
body .Related .top::before {
  position: absolute;
  content: "";
  width: 5px;
  height: 22px;
  background: #ff9e02;
  border-radius: 3px;
  left: -10px;
  top: 37px;
}
body .Related .swiper {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
}
body .Related .swiper .swiper-button-next,
body .Related .swiper .swiper-button-prev {
  width: 14px;
  height: 28px;
}
body .Related .swiper .swiper-pagination {
  bottom: 90px;
}
body .Related .swiper .swiper-pagination .swiper-pagination-bullet-active {
  background: #f8b551;
}
body .Related .swiper .swiper-pagination-bullet {
  width: 10px;
  height: 10px;
  width: 21px;
  height: 21px;
  background: #ffffff;
  border: 1px solid #f8b551;
  border-radius: 50%;
}
body .Related .swiper .swiper-slide {
  text-align: center;
  font-size: 18px;
  background: #fff;
  /* Center slide text vertically */
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}
body .Related .swiper .swiper-slide img {
  display: block;
  width: 206px;
  height: 140px;
  border-radius: 6px;
  object-fit: cover;
  margin: 0 10px;
}
body .Related .swiper {
  margin-left: auto;
  margin-right: auto;
}

body footer .top {
  width: 1000px;
  margin: 0 auto;
}
body footer .top ul {
  display: flex;
  justify-content: space-between;
}
body footer .top ul li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}
body footer .top ul li h1 {
  font-size: 30px;
  font-weight: bold;
  color: #e82b2f;
  line-height: 40px;
  text-align: center;
  margin-top: 50px;
}
body footer .top ul li img {
  width: 70px;
  height: 70px;
  margin: 20px auto;
}
body footer .top ul li h5 {
  font-size: 16px;
  font-weight: 600;
  color: #e82b2f;
  width: 110px;
  text-align: left;
  margin: 60px 0 30px;
}
body footer .top ul li p {
  font-size: 12px;
  color: #ffffff;
  display: flex;
  align-items: center;
  flex-direction: column;
  text-align: center;
}
body footer .top ul li p a {
  display: block;
  width: 110px;
  font-size: 12px;
  color: #ffffff;
  line-height: 20px;
  text-align: left;
}
body footer .center {
  display: flex;
  justify-content: center;
  margin-top: 30px;
}
body footer .center ul {
  margin-right: 20px;
}
body footer .center ul li {
  text-align: center;
}
body footer .center ul li a {
  font-size: 12px;
  color: #ffffff;
}
body footer .center .img {
  display: flex;
  align-items: center;
}
body footer .center .img img:first-child {
  width: 134px;
  height: 47px;
  margin-right: 5px;
}
body footer .center .img img:last-child {
  width: 49px;
  height: 40px;
}
body footer .bottom::before {
  width: 100%;
  height: 1px;
  background: #ffffff;
  opacity: 0.8;
  content: "";
  position: absolute;
  top: -20px;
}
body footer .bottom {
  position: relative;
  width: 100%;
}
body footer .bottom ul {
  width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
}
body footer .bottom ul li a {
  font-size: 12px;
  color: #ffffff;
}
.inpt {
  border-radius: 37px;
  width: 587px;
  height: 74px;
  padding: 13px 0;
  background: url(../images/back.png) no-repeat center;
  background-size: 100% 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-evenly;
  position: absolute;
  left: 598px;
  top: 277px;
  z-index: 999;
}
.inpt input {
  width: 350px;
  height: 36px;
  font-size: 35px;
  color: #fea244;
  line-height: 24px;
}
.inpt input::-webkit-input-.placeholde {
  color: #fea244;
}
body .banner .swiper .swiper-slide .inpt img {
  width: 83px;
  height: 40px;
}
.nav_1 {
  width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}


.qrcode_mask {
  display: none;
}

.qrcode_mask .mask_code {
  position: fixed;
  top: 0px;
  width: 100%;
  height: 100%;
  right: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 400;
}

.qrcode_mask .qrcode_content {
  width: 760px;
  position: fixed;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 33333;
}

.qrcode_mask .qrcode_content .header_wrap {
  height: 74px;
  width: 100%;
  display: flex;
  justify-content: center;
  padding-top: 19px;
}

.qrcode_mask .qrcode_content .header_wrap .header_content {
  display: flex;
  justify-content: center;
}

.qrcode_mask .qrcode_content .header_wrap img {
  width: 20px;
  height: 20px;
  margin-right: 2px;
  margin-top: 1px;
}

.qrcode_mask .qrcode_content .header_wrap .title {
  font-family: MicrosoftYaHei;
  font-size: 18px;
  color: #333333;
}

.qrcode_mask .qrcode_content .qr_main {
  position: relative;
}

.qrcode_mask .qrcode_content .qr_main img {
  width: 100%;
}

.qrcode_mask .qrcode_content .qr_main .avatar_wrap {
  position: absolute;
  top: -32px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
}

.qrcode_mask .qrcode_content .qr_main .avatar_wrap .avatar {
  width: 76px;
  height: 76px;
  border-radius: 50%;
}

.qrcode_mask .qrcode_content .qr_main .avatar_wrap .avatar img {
  width: 76px;
  height: 76px;
}

.qrcode_mask .qrcode_content .qr_main .avatar_wrap .teacher_name {
  font-family: MicrosoftYaHei;
  font-size: 16px;
  color: #333333;
}

.qrcode_mask .qrcode_content .qr_main .zhanwei {
  height: 74px;
}

.qrcode_mask .qrcode_content .qr_main .desc {
  font-family: MicrosoftYaHei;
  font-size: 14px;
  color: #999999;
  width: 100%;
  text-align: center;
}

.qrcode_mask .qrcode_content .qr_main .saoma {
  font-family: MicrosoftYaHei, MicrosoftYaHei;
  font-weight: bold;
  font-size: 18px;
  width: 100%;
  text-align: center;
  color: #EF6106;
  margin-top: 20px;
}

.qrcode_mask .qrcode_content .qr_main .qr_code {
  text-align: center;
}

.qrcode_mask .qrcode_content .qr_main .qr_code img {
  width: 232px;
  height: 232px;
  margin-top: 16px;
}

.qrcode_mask .qrcode_content .app_code {
  position: absolute;
  bottom: 29px;
  right: 65px;
  transform: translateX(-50%);
  z-index: 44444444;
}

.qrcode_mask .qrcode_content .app_code img {
  width: 146px;
  height: 146px;
}

.qrcode_mask .qrcode_content .close_qrCode {
  position: absolute;
  bottom: -60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 44444444;
  cursor: pointer;
}

.qrcode_mask .qrcode_content .close_qrCode img {
  width: 32px;
  height: 32px;
}

/*题库*/
.qrcode_mask .qrcode_content .tk_code {
  position: absolute;
  bottom: 81px;
  left: 169px;
  transform: translateX(-50%);
  z-index: 44444444;
}

.qrcode_mask .qrcode_content .tk_code img {
  width: 146px;
  height: 146px;
}



@media (min-width: 751px) and (max-width: 1600px) {
  body .nav .center {
    margin: 0 50px;
  }
}
@media screen and (max-width: 750px) {
  body header {
    display: none;
  }
  body .banner .swiper .swiper-slide .inpt img {
    width: 0.83rem;
    height: 0.4rem;
  }
  body .nav {
    display: none;
  }
  body .header {
    width: 100%;
    height: 0.88rem;
    display: flex;
    padding: 0.18rem 0.32rem;
    justify-content: space-between;
    background-color: #fff;
    align-items: flex-start;
  }
  body .header img {
    width: 0.48rem;
    height: 0.54rem;
  }
  body .header a:nth-child(2) img {
    width: 1.96rem;
    height: 0.54rem;
  }

  body footer {
    display: none;
  }
  body .nav1 {
    display: block;
    width: 100%;
    height: 0.8rem;
    background: #ffffff;
    display: flex;
    justify-content: center;
    padding: 0.14rem 0;
  }
  body .nav1 .inp {
    width: 5.84rem;
    height: 0.48rem;
    background: #f6f6f6;
    border-radius: 0.04rem;
    margin-right: 0.1rem;
    padding-left: 0.08rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  body .nav1 .inp input {
    width: 90%;
  }
  body .nav1 .inp img {
    width: 0.34rem;
    height: 0.34rem;
  }
  body .nav1 a {
    width: 0.94rem;
    height: 0.48rem;
    background: #e82b2f;
    border-radius: 0.04rem;
    font-size: 0.26rem;
    color: #ffffff;
    line-height: 0.48rem;
    text-align: center;
  }
  body .banner {
    width: 100%;
    height: 3rem;
  }
  body .banner .swiper .swiper-pagination {
    bottom: 0.2rem;
  }
  body .banner .swiper .swiper-pagination .swiper-pagination-bullet-active {
    width: 0.2rem;
    height: 0.04rem;
  }
  body .banner .swiper .swiper-pagination .swiper-pagination-bullet {
    width: 0.2rem;
    height: 0.04rem;
  }
  body .main .top {
    width: 100%;
  }
  body .main .top ul {
    width: 11rem;
    justify-content: flex-start;
    margin: 0.1rem 0 0.1rem 0.23rem;
  }
  body .main .top ul li {
    width: 1.64rem;
    height: 0.58rem;
    background: #ffffff;
    border-radius: 0.08rem;
    font-size: 0.28rem;
    color: #333333;
    line-height: 0.58rem;
    text-align: center;
    margin: 0.1rem;
  }
  body .main .top ul .active {
    width: 1.64rem;
    height: 0.58rem;
    background: #e82b2f;
    border-radius: 0.08rem;
    font-size: 0.28rem;
    color: #ffffff;
  }
  body .main .text {
    width: 100%;
  }
  .placeholde {
    margin-bottom: 1.2rem;
  }
  body .main .text .placeholde ul {
    margin: 0 0.23rem;
  }
  body .main .text .placeholde ul li {
    width: 3.32rem;
    height: 5rem;
    background: #ffffff;
    border-radius: 0.08rem;
    margin: 0.1rem 0.1rem;
  }
  body .main .text .placeholde ul li:nth-child(3n-1) {
    margin: 0.1rem 0.1rem;
  }
  body .main .text .placeholde ul li p a {
    width: 2.88rem;
    height: 1.65rem;
    font-size: 0.26rem;
    display: block;
    color: #333333;
    line-height: 0.4rem;
    margin: 0.14rem auto;
    text-overflow: -o-ellipsis-lastline;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
  }
  body .main .text .placeholde ul li img {
    width: 3.32rem;
    height: 1.66rem;
  }
  body .main .text .placeholde ul li .heat {
    width: 3rem;
    height: 0.5rem;
    margin: 0 auto;
    padding: 0.04rem;
  }
  body .main .text .placeholde ul li .heat P {
    font-size: 0.24rem;
    color: #e82b2f;
    height: 100%;
    width: 1.2rem;
    line-height: 0.45rem;
  }
  body .main .text .placeholde ul li .heat img {
    width: 0.25rem;
    height: 0.25rem;
    margin: 0;
  }
  body .main .text .placeholde ul li a {
    width: 1.8rem;
    height: 0.48rem;
    background: url(../images/a.png) no-repeat top center;
    background-size: 100% 100%;
    font-size: 0.24rem;
    color: #ffffff;
    line-height: 0.48rem;
    text-align: center;
    margin: 0.24rem auto;
  }
  body .Related {
    width: 350px;
    height: 2.56rem;
    background: #ffffff;
    margin: 0.3rem auto;
  }
  body .Related .top {
    font-size: 0.32rem;
    font-weight: bold;
    color: #333333;
    line-height: 0.42rem;
    position: relative;
    margin-left: 0.2rem;
    padding-top: 0.2rem;
  }
  body .Related .top::before {
    content: "";
    position: absolute;
    width: 0.04rem;
    height: 0.3rem;
    top: 0.26rem;
    background: #e82b2f;
    border-radius: 0.02rem;
    left: -0.2rem;
  }
  body .Related .swiper {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: relative;
  }
  body .Related .swiper .swiper-button-next,
  body .Related .swiper .swiper-button-prev {
    width: 0.24rem;
    height: 0.24rem;
    top: 1.1rem;
  }
  body .Related .swiper .swiper-pagination {
    bottom: 0.8rem;
  }
  body .Related .swiper .swiper-pagination .swiper-pagination-bullet-active {
    background: url(../images/swiper.png) no-repeat top center;
    background-size: 100% 100%;
    width: 0.16rem;
    height: 0.16rem;
  }
  body .Related .swiper .swiper-pagination-bullet {
    width: 0.12rem;
    height: 0.12rem;
    background: #e3e3e3;
    border: 0;
    border-radius: 50%;
  }
  body .Related .swiper .swiper-slide {
    text-align: center;
    font-size: 0.36rem;
    background: #fff;
    width: 100%;
    /* Center slide text vertically */
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
  }
  body .Related .swiper .swiper-slide img {
    display: block;
    width: 1.6rem;
    height: 1.2rem;
    border-radius: 0.12rem;
    object-fit: cover;
    margin: 0 0.2rem;
  }
  body .Related .swiper .swiper-slide img:nth-child(4),
  body .Related .swiper .swiper-slide img:nth-child(5) {
    display: none;
  }
  body .footer {
    display: block;
    width: 7.5rem;
    height: 3.28rem;
    background: #fff;
    padding-top: 0.2rem;
    margin-top: 0.32rem;
    bottom: 0rem;
    position: relative;
  }
  body .footer ul li {
    text-align: center;
    width: 6.86rem;
    color: #666666;
    margin: 0.1rem auto;
    line-height: 0.48rem;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  body .footer ul li img {
    width: 2rem;
    height: 0.5rem;
    margin: 0 auto;
  }
  body .main .top {
    overflow-x: auto;
    position: relative;
    white-space: nowrap;
    padding-right: 0.6rem;
  }

  .inpt {
    width: 3.7rem;
    height: 0.5rem;
    padding: 0;
    background: url(../images/back.png) no-repeat center;
    background-size: 100% 100%;
    display: flex;
    align-items: flex-start;
    justify-content: space-evenly;
    position: absolute;
    left: 44%;
    top: 55%;
    transform: translateX(-50%);
    z-index: 999;
  }
  .inpt input {
    color: #ff8800;
    width: 1.8rem;
    height: 0.4rem;
    font-size: 0.2rem;
  }
  body .banner .swiper .swiper-slide .inp img {
    width: 0.4rem;
    height: 0.4rem;
  }

  ::-webkit-scrollbar {
    -webkit-appearance: none;
  }
  ::-webkit-scrollbar:horizontal {
    height: 4px;
  }
  ::-webkit-scrollbar-thumb {
    background-color: rgba(200, 200, 200, 1);
    border-radius: 10px;
    border: 1px solid #dddddd;
  }
  ::-webkit-scrollbar-track {
    border-radius: 10px;
    background-color: #dddddd;
    margin-left: 0.35rem;
    margin-right: 0.35rem;
  }
}