html,
body {
  max-width: 640px;
  margin: 0 auto;
}
.justify,
.double-title-btn,
.lean-kinds-wrap ul,
.adv-wrap ul,
.teach-step-wrap ul,
.why-choice-wrap .choice-box ul,
.envir-wrap ul {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-wrap: wrap;
      -ms-flex-wrap: wrap;
          flex-wrap: wrap;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
      -ms-flex-pack: justify;
          justify-content: space-between;
}
.ban-wrap img {
  width: 16rem;
  height: 7.95rem;
}
.double-title-btn {
  width: 15.5rem;
  margin: 0 auto;
  margin-top: 0.25rem;
  margin-bottom: 0.375rem;
}
.double-title-btn a {
  display: block;
  -webkit-box-flex: 1;
  -webkit-flex: 1;
      -ms-flex: 1;
          flex: 1;
  height: 1.5rem;
  line-height: 1.5rem;
  font-size: 0.6rem;
  color: #000000;
  text-indent: 2.7rem;
  background: #ffcb2f;
  position: relative;
}
.double-title-btn a:last-child {
  background: #c5292a;
  color: #ffcb2f;
}
.double-title-btn a i {
  display: block;
  width: 0.9rem;
  height: 0.9rem;
  background: url('../img/ixon/icon-bg-01.png') no-repeat center / contain;
  position: absolute;
  top: 50%;
  left: 1.4rem;
  -webkit-transform: translateY(-50%);
      -ms-transform: translateY(-50%);
          transform: translateY(-50%);
}
.double-title-btn a:last-child i {
  background: url('../img/ixon/icon-bg-02.png') no-repeat center / contain;
}
.head-wrap {
  text-align: center;
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
}
.head-wrap h1 {
  line-height: 1.5rem;
  font-size: 0.675rem;
  color: #000000;
  font-weight: bold;
}
.head-wrap h1 span {
  line-height: 1.5rem;
  font-size: 0.675rem;
  color: #f01111;
}
.lean-kinds-wrap ul {
  width: 15.4rem;
  margin: 0 auto;
}
.lean-kinds-wrap ul li {
  width: 4.975rem;
  margin-bottom: 0.375rem;
}
.lean-kinds-wrap ul li a {
  display: block;
  width: 100%;
}
.lean-kinds-wrap ul li a img {
  width: 100%;
  height: 3.875rem;
}
.lean-kinds-wrap ul li a h3 {
  line-height: 1rem;
  font-size: 0.5rem;
  color: #29180e;
  text-align: center;
}
.sect-zx {
  display: block;
  width: 10.25rem;
  margin: 0 auto;
  line-height: 1.5rem;
  font-size: 0.75rem;
  color: #ffd452;
  text-align: center;
  font-weight: bold;
  border-radius: 0.5rem 0.5rem 0.5rem 0.5rem;
  background: #e60012;
  margin-top: 0.375rem;
  margin-bottom: 0.375rem;
}
.adv-wrap ul {
  width: 14.5rem;
  margin: 0 auto;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}
.adv-wrap ul li {
  width: 2.5rem;
}
.adv-wrap ul li a {
  display: block;
  width: 100%;
}
.adv-wrap ul li a i {
  display: block;
  width: 100%;
  height: 2.5rem;
}
.adv-wrap ul li a h3 {
  line-height: 0.85rem;
  font-size: 0.5rem;
  color: #000000;
  text-align: center;
  margin-top: 0.25rem;
}
.adv-wrap ul li:nth-of-type(1) i {
  background: url('../img/ixon/icon-adv01.png') no-repeat center / contain;
}
.adv-wrap ul li:nth-of-type(2) i {
  background: url('../img/ixon/icon-adv02.png') no-repeat center / contain;
}
.adv-wrap ul li:nth-of-type(3) i {
  background: url('../img/ixon/icon-adv03.png') no-repeat center / contain;
}
.adv-wrap ul li:nth-of-type(4) i {
  background: url('../img/ixon/icon-adv04.png') no-repeat center / contain;
}
.teach-step-wrap ul {
  width: 15.25rem;
  margin: 0 auto;
  margin-top: 0.5rem;
}
.teach-step-wrap ul li {
  width: 6.5rem;
  margin-bottom: 0.375rem;
  position: relative;
}
.teach-step-wrap ul li a {
  display: block;
  width: 100%;
}
.teach-step-wrap ul li a img {
  width: 100%;
  height: 3.375rem;
}
.teach-step-wrap ul li a h3 {
  line-height: 1rem;
  font-size: 0.5rem;
  color: #29180e;
  text-align: center;
}
.teach-step-wrap ul li:nth-child(even)::before {
  content: '';
  display: block;
  width: 1.15rem;
  height: 0.825rem;
  background: url('../img/ixon/arrow-right.png') no-repeat center / contain;
  position: absolute;
  top: 1.35rem;
  left: -1.675rem;
  -webkit-transform: translateY(-50%);
      -ms-transform: translateY(-50%);
          transform: translateY(-50%);
}
.teach-step-wrap ul li:nth-of-type(4)::before {
  -webkit-transform: rotateY(180deg) translateY(-50%);
          transform: rotateY(180deg) translateY(-50%);
}
.preempt-wrap a {
  display: block;
}
.preempt-wrap a img {
  width: 16rem;
  height: 3.5rem;
}
.why-choice-wrap {
  width: 16rem;
  height: 19.1rem;
  margin-top: 0.75rem;
  background: url('../img/ixon/ixon-bg.jpg') no-repeat center / contain;
}
.why-choice-wrap .head-wrap h1 {
  color: #fff;
  padding-top: 0.375rem;
}
.why-choice-wrap .choice-box ul {
  width: 15.375rem;
  margin: 0 auto;
}
.why-choice-wrap .choice-box ul li {
  width: 7.25rem;
  height: 6.25rem;
  background: #fff;
  margin-top: 0.5rem;
  margin-bottom: 0.625rem;
}
.why-choice-wrap .choice-box ul li i {
  display: block;
  width: 2rem;
  margin: 0 auto;
  height: 1.625rem;
  margin-top: 0.25rem;
  background: url('../img/ixon/ixon-03.png') no-repeat center / contain;
}
.why-choice-wrap .choice-box ul li:nth-of-type(2) i {
  background: url('../img/ixon/ixon-04.png') no-repeat center / contain;
}
.why-choice-wrap .choice-box ul li:nth-of-type(3) i {
  background: url('../img/ixon/ixon-05.png') no-repeat center / contain;
}
.why-choice-wrap .choice-box ul li:nth-of-type(4) i {
  background: url('../img/ixon/ixon-06.png') no-repeat center / contain;
}
.why-choice-wrap .choice-box ul li h3 {
  line-height: 1.125rem;
  font-size: 0.55rem;
  color: #ca090a;
  text-align: center;
}
.why-choice-wrap .choice-box ul li p {
  width: 6.2rem;
  margin: 0 auto;
  line-height: 0.9rem;
  font-size: 0.5rem;
  color: #595959;
  text-align: justify;
}
.envir-wrap ul {
  width: 14.675rem;
  margin: 0 auto;
}
.envir-wrap ul li {
  width: 7rem;
  margin-bottom: 0.75rem;
}
.envir-wrap ul li a {
  display: block;
}
.envir-wrap ul li a img {
  width: 100%;
  height: 4.675rem;
}