.logo_in {
  background-color: #0075b0;
  font-size: 18px;
  color: #fff;
  text-align: center;
  width: 200px;
  line-height: 50px;
  /*border-radius: 5px;*/
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
  display: block;
  margin: 20px auto;
}

.logo_in:hover {
  color: #fff;
}

.hint_txt {
  max-width: 800px;
  text-align: center;
  margin: 5px auto;
  font-size: 14px;
  line-height: 16px;
  color: #969696;
}

.c26 {
  color: #262626;
  font-weight: 600;
}
body {
  font-family: sans-serif;
}
@media screen and (min-width: 761px) {
  .h3 {
    font-size: 18px;
    color: #46555f;
  }

  .head img {
    margin-top: 40px;
  }

  .head {
    height: 90px;
  }

  .head .ams-logo {
    height: 35px;
  }

  .head .e_logo {
    height: 45px;
    float: right;
    margin-top: 30px;
  }

  .intro {
    padding: 0 0 30px;
    color: #fff;
  }

  .intro .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 0;
    color: #46555f;
  }

  .intro .h3 {
    color: #fff;
  }

  .intro p {
    font-size: 17px;
    line-height: 28px;
    margin-bottom: 10px;
  }

  .intro .txt li{
    font-size: 17px;
    line-height: 28px;
  }

  .teacher {
    padding: 0 0 35px;
  }

  .teacher .h3 {
    font-size: 18px;
  }

  .teacher .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .teacher p {
    font-size: 18px;
    line-height: 32px;
    color: #46555f;
  }

  .prod {
    padding: 0 0 30px;
  }

  .prod .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .prod p {
    font-size: 18px;
    line-height: 30px;
    color: #46555f;
  }

  .video {
    padding: 0 0 30px;
  }

  .video .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .video .video-box {
    padding: 10px;
    width: 100%;
    font-size: 18px;
    line-height: 35px;
  }

  .video .video-box p {
    color: #46555f;
  }

  .video .video-box .iframe {
    width: 100%;
    height: 350px;
    box-shadow: 0 0 8px #adadad;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
    margin-bottom: 15px;
  }

  .gift {
    padding: 0 0 30px;
  }

  .gift .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .gift .img-res {
    width: 100%;
  }

  .about {
    padding: 0 0 30px;
    color: #fff;
    font-size: 17px;
    line-height: 40px;
  }

  .about .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #fff;
  }

  .contact {
    padding: 0 0 30px;
    font-size: 18px;
    line-height: 40px;
  }

  .contact .h2 {
    font-size: 28px;
    text-align: center;
    line-height: 40px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .contact p {
    line-height: 40px;
    color: #46555f;
  }
}

@media screen and (max-width: 760px) {
  .h3 {
    font-size: 1rem;
  }

  .head {
    height: 2rem;
    padding-top: .9rem;
  }

  .head .ams-logo {
    height: 1.3rem;
  }

  .head .e_logo {
    height: 1.3rem;
  }

  .intro {
    padding: 0 0 1.5rem;
    color: #fff;
  }

  .intro .h2 {
    font-size: 1.2rem;
    text-align: center;
    line-height: 1.7rem;
    margin-top: 1.7rem;
    margin-bottom: 0;
    color: #46555f;
  }

  .intro .h3 {
    color: #fff;
  }

  .intro p {
    font-size: .8rem;
    line-height: 25px;
    color: #46555f;
  }

  .intro .txt {
    font-size: .8rem;
    line-height: 30px;
  }

  .teacher {
    padding: 0 0 30px;
  }

  .teacher .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .teacher p {
    font-size: 18px;
    line-height: 25px;
    color: #46555f;
  }

  .prod {
    padding: 0 0 30px;
  }

  .prod .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .prod p {
    font-size: .8rem;
    line-height: 25px;
    color: #46555f;
  }

  .video {
    padding: 0 0 30px;
  }

  .video .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .video .video-box {
    padding: 10px;
    width: 100%;
    font-size: .8rem;
    line-height: 30px;
  }

  .video .video-box p {
    color: #46555f;
  }

  .video .video-box .iframe {
    width: 100%;
    height: 200px;
    box-shadow: 0 0 8px #adadad;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
    margin-bottom: 15px;
  }

  .gift {
    padding: 0 0 30px;
  }

  .gift .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .gift .img-res {
    width: 100%;
  }

  .about {
    padding: 0 0 30px;
    color: #fff;
    font-size: .8rem;
    line-height: 30px;
  }

  .about .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #fff;
  }

  .contact {
    padding: 0 0 30px;
    font-size: .8rem;
    line-height: 30px;
  }

  .contact .h2 {
    font-size: 1.4rem;
    text-align: center;
    line-height: 35px;
    margin-top: 35px;
    margin-bottom: 30px;
    color: #46555f;
  }

  .contact .m-tc {
    text-align: center;
  }

  .contact p {
    line-height: 35px;
    color: #46555f;
  }

  .btn-back {
    margin-top: 2rem;
  }
}