html,
body {
  margin: 0;
  padding: 0;
  min-width: 800px;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  background-color: #f3f8ff;
}

a {
  color: inherit;
  text-decoration: none;
}

.header-placeholder {
  height: 70px;
  width: 100%;
}

.header {
  background-color: #f4f7fd;
  height: 70px;
  min-width: 800px;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
}

.header .content {
  display: table;
  width: 100%;
  height: 100%;
}

.title {
  display: table-cell;
  vertical-align: middle;
  width: 146px;
  height: 24px;
  padding: 20px 0 20px 20px;
}

.title img {
  width: 146px;
  height: 24px;
}

.nav {
  display: table-cell;
  vertical-align: middle;
  padding: 0 0 0 120px;
}

.nav-item {
  font-weight: 500;
  font-size: 16px;
  color: #666666;
  line-height: 22px;
  margin-right: 80px;
  cursor: pointer;
  transition: color 0.3s;
}

.nav-item.active {
  color: #0561F3;
  font-weight: 600;
  position: relative;
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: #1677FF;
  border-radius: 1px;
}

.desc {
  display: table-cell;
  vertical-align: middle;
  padding: 0 20px 0 0;
  font-weight: 500;
  font-size: 16px;
  color: #666666;
  line-height: 22px;
  text-align: right;
}

.banner {
  width: 100%;
  font-size: 0;
}

.banner img {
  width: 100%;
  height: auto;
}

.intro {
  padding: 100px 50px 0;
}

.intro-title {
  font-weight: 600;
  font-size: 32px;
  color: #333333;
  line-height: 45px;
  text-align: center;
  margin-bottom: 80px;
}

.intro-list {
  width: 100%;
  height: 100%;
  text-align: center;
}

.intro-item {
  display: inline-block;
  vertical-align: top;
  width: 320px;
  height: 258px;
  background: #FFFFFF;
  border-radius: 24px;
  margin: 0 20px 20px;
  padding: 30px 0;
  text-align: center;
  transition: all 0.3s;
  box-sizing: border-box;
}

.intro-item:hover {
  cursor: pointer;
  box-shadow: 0px 0px 16px 0px rgba(5, 97, 243, 0.2);
}

.intro-item img {
  width: 120px;
  height: 120px;
  object-fit: contain;
}

.intro-item-text1 {
  font-weight: 600;
  font-size: 24px;
  color: #0561F3;
  line-height: 33px;
  margin-top: 15px;
}

.intro-item-text2 {
  font-weight: 400;
  font-size: 18px;
  color: #666666;
  line-height: 25px;
  margin-top: 5px;
}

.about {
  width: 100%;
  background: #FFFFFF;
  display: table;
  text-align: center;
  margin-top: 200px;
}

.about-content {
  display: table-cell;
  vertical-align: middle;
  padding: 40px 200px;
  text-align: left;
  position: relative;
}

.about-text {
  display: inline-block;
  vertical-align: middle;
  max-width: 667px;
}

.about-text1 {
  font-weight: 600;
  font-size: 24px;
  color: #333333;
  line-height: 33px;
  margin-bottom: 20px;
}

.about-text2 {
  font-weight: 400;
  font-size: 16px;
  color: #333333;
  line-height: 22px;
  margin-bottom: 10px;
}

.about-text2:last-child {
  margin-bottom: 0;
}

.about-text2 span {
  font-weight: bold;
}

.about-img {
  position: absolute;
  right: 200px;
  top: 50%;
  transform: translateY(-50%);
}

.about-img img {
  width: 136px;
  height: 136px;
  object-fit: contain;
}

footer {
  width: 100%;
  height: 74px;
  background: #3388FE;
  font-weight: 400;
  font-size: 12px;
  color: #FFFFFF;
  line-height: 17px;
  text-align: center;
  display: table;
}

.footer-text {
  display: table-cell;
  vertical-align: middle;
}

.text-center {
  text-align: center;
}