.main .mobile {
  display: none !important; }
  @media screen and (min-width: 320px) and (max-width: 767px) {
    .main .mobile {
      display: block !important; } }

.main .banner {
  width: 100%;
  height: 36.458vw;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 0 18.750vw;
  color: #fff;
  text-align: center; }
  .main .banner h3 {
    font-size: 2.396vw;
    margin-bottom: 1.250vw; }
  .main .banner p {
    width: 23.438vw;
    font-size: 1.042vw;
    font-family: PingFang SC-Regular, PingFang SC; }
  @media screen and (min-width: 320px) and (max-width: 767px) {
    .main .banner {
      height: 9.03rem;
      padding: 0 0.77rem; }
      .main .banner h3 {
        font-size: 0.54rem; }
      .main .banner p {
        width: 7.05rem;
        font-size: 0.34rem; } }
  @media screen and (min-width: 768px) and (max-width: 1180px) {
    .main .banner {
      height: 600px;
      padding: 0 42px; }
      .main .banner h3 {
        font-size: 36px;
        margin-bottom: 20px; }
      .main .banner p {
        font-size: 21px; } }

.main .course {
  width: 2px;
  margin: 70px auto 60px;
  position: relative; }
  .main .course::before {
    content: '';
    background: #dddddd;
    position: absolute;
    width: 2px;
    top: 0;
    left: 0;
    bottom: 0; }
  .main .course .course-box:nth-child(1) {
    margin-top: -24px; }
  .main .course .right, .main .course .left {
    position: absolute; }
  .main .course .right {
    margin-left: -20px;
    display: flex; }
    .main .course .right .qiu {
      width: 48px;
      height: 48px; }
      .main .course .right .qiu img {
        width: 100%;
        height: 100%; }
    .main .course .right .content {
      margin: 0 24px; }
      .main .course .right .content .year {
        font-size: 38px;
        font-weight: bold; }
      .main .course .right .content .kuai {
        width: 460px;
        background-color: #F6F6F6;
        padding: 40px;
        margin-top: 41px;
        position: relative;
        border-radius: 5px; }
        .main .course .right .content .kuai::before {
          content: '';
          width: 26px;
          height: 16px;
          background: url("../img/course/PC/sanjiao.png") no-repeat 0 0;
          background-size: 100% 100%;
          position: absolute;
          top: -16px;
          left: 30px; }
        .main .course .right .content .kuai .month {
          display: inline-block;
          background-color: #69d1f3;
          color: #fff;
          font-size: 14px;
          padding: 5px 15px;
          margin-bottom: 30px; }
        .main .course .right .content .kuai .h3 {
          font-size: 22px;
          font-weight: bold;
          margin-bottom: 12px; }
        .main .course .right .content .kuai .p {
          color: #444444;
          font-size: 18px; }
  .main .course .left {
    display: flex;
    margin-left: -24px; }
    .main .course .left .qiu {
      width: 48px;
      height: 48px;
      transform: rotate(180deg); }
      .main .course .left .qiu img {
        width: 100%;
        height: 100%; }
    .main .course .left .content {
      margin: 0 24px;
      margin-left: -524px; }
      .main .course .left .content .year {
        font-size: 38px;
        font-weight: bold;
        text-align: right; }
      .main .course .left .content .kuai {
        width: 460px;
        background-color: #F6F6F6;
        padding: 40px;
        margin-top: 41px;
        position: relative;
        border-radius: 5px; }
        .main .course .left .content .kuai::before {
          content: '';
          width: 26px;
          height: 16px;
          background: url("../img/course/PC/sanjiao.png") no-repeat 0 0;
          background-size: 100% 100%;
          position: absolute;
          top: -16px;
          right: 30px; }
        .main .course .left .content .kuai .month {
          display: inline-block;
          background-color: #69d1f3;
          color: #fff;
          font-size: 14px;
          padding: 5px 15px;
          margin-bottom: 30px; }
        .main .course .left .content .kuai .h3 {
          font-size: 22px;
          font-weight: bold;
          margin-bottom: 12px; }
        .main .course .left .content .kuai .p {
          color: #444444;
          font-size: 18px; }
  @media screen and (min-width: 768px) and (max-width: 1180px) {
    .main .course .right {
      margin-left: -11px; }
      .main .course .right .qiu {
        width: 30px;
        height: 30px; }
      .main .course .right .content .year {
        font-size: 26px; }
      .main .course .right .content .kuai {
        width: 300px;
        padding: 20px 17px;
        margin-top: 10px; }
        .main .course .right .content .kuai::before {
          width: 13px;
          height: 8px;
          top: -8px; }
        .main .course .right .content .kuai .month {
          font-size: 15px;
          padding: 5px;
          border-radius: 3px;
          margin-bottom: 15px; }
        .main .course .right .content .kuai .h3 {
          font-size: 21px; }
    .main .course .left {
      margin-left: -15px; }
      .main .course .left .qiu {
        width: 30px;
        height: 30px; }
      .main .course .left .content {
        margin-left: -355px; }
        .main .course .left .content .year {
          font-size: 26px; }
        .main .course .left .content .kuai {
          width: 300px;
          padding: 20px 17px;
          margin-top: 10px; }
          .main .course .left .content .kuai::before {
            width: 13px;
            height: 8px;
            top: -8px; }
          .main .course .left .content .kuai .month {
            font-size: 15px;
            padding: 5px;
            border-radius: 3px;
            margin-bottom: 15px; }
          .main .course .left .content .kuai .h3 {
            font-size: 21px; } }
  @media screen and (min-width: 320px) and (max-width: 767px) {
    .main .course {
      width: initial;
      margin: 1.11rem 0.41rem; }
      .main .course::before {
        top: 0.31rem;
        left: 0.23rem;
        width: 0.01rem; }
      .main .course .left, .main .course .right {
        position: initial;
        margin-left: 0; }
        .main .course .left .qiu, .main .course .right .qiu {
          position: relative;
          z-index: 9;
          width: 0.62rem;
          height: 0.62rem; }
        .main .course .left .content, .main .course .right .content {
          margin: 0 0.31rem;
          flex: 1; }
          .main .course .left .content .year, .main .course .right .content .year {
            font-size: 0.49rem; }
          .main .course .left .content .kuai, .main .course .right .content .kuai {
            margin-top: 0.32rem;
            width: initial;
            padding: 0.43rem 0.44rem; }
            .main .course .left .content .kuai .top, .main .course .right .content .kuai .top {
              display: flex;
              justify-content: space-between;
              align-items: center;
              margin-bottom: 0.17rem; }
            .main .course .left .content .kuai .month, .main .course .right .content .kuai .month {
              display: none;
              margin-bottom: 0;
              padding: 0.08rem 0.09rem;
              font-size: 0.31rem;
              border-radius: 0.09rem; }
            .main .course .left .content .kuai .h3, .main .course .right .content .kuai .h3 {
              font-size: 0.39rem;
              margin-bottom: 0; }
            .main .course .left .content .kuai .p, .main .course .right .content .kuai .p {
              font-size: 0.34rem;
              color: #444444; }
            .main .course .left .content .kuai::before, .main .course .right .content .kuai::before {
              width: 0.34rem;
              height: 0.21rem;
              top: -0.21rem; }
      .main .course .left .qiu {
        transform: rotate(0deg); }
      .main .course .left .content .year {
        text-align: left; }
      .main .course .left .content .kuai::before {
        right: initial;
        left: 30px; }
      .main .course .course-box {
        padding-left: 0;
        width: 100%;
        margin-bottom: 0.57rem; }
        .main .course .course-box:last-child {
          margin-bottom: 0; }
        .main .course .course-box:nth-child(1) {
          margin-top: 0; } }