.header .nav-box .nav-item:nth-child(3) .link {
  color: red;
}
.introduce {
  display: flex;
  padding: 24px 0;
}
.introduce .introduce-item {
  flex: 1;
}
.introduce .introduce-item .img {
  display: block;
  width:80%;
  margin: auto;
}
.introduce .introduce-item .introduce-title {
  font-size: 48px;
  font-weight: bold;
  line-height: 1;
  margin-bottom: 24px;
  margin-top: 56px;
}
.introduce .introduce-item .introduce-desc {
    width: 80%;
    text-indent: 2em;
    margin-bottom: 8px;
    font-size: 16px;
}

.feature .feature-title {
  text-align: center;
  font-size: 48px;
  font-weight: bold;
  line-height: 1;
  margin-bottom: 24px;
  margin-top: 56px;
}
.feature .feature-desc {
  margin-bottom: 12px;
  padding: 0 4em;
}

.future .future-title {
  text-align: center;
  font-size: 48px;
  font-weight: bold;
  line-height: 1;
  margin-bottom: 24px;
  margin-top: 56px;
}
.future .future-desc {
  padding: 0 4em;
}

.license .license-title {
  text-align: center;
  font-size: 48px;
  font-weight: bold;
  line-height: 1;
  margin-bottom: 24px;
  margin-top: 56px;
}
.license .license-content .img {
  display:block;
  width: 40%;
  margin: auto;
  margin-bottom: 120px;
}