.about-banner img {
  display: block;
  width: 100%;
}
.nav-wrapper {
  border-bottom: 1px solid #c0c0c0;
  position: sticky;
  top: -1px;
  z-index: 10;
  background-color: #fff;
}
.nav-wrapper .nav {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  height: 80px;
  background-color: #fff;
  border: 1px solid #fff;
  padding-left: 5px;
}
.nav-wrapper .nav .nav-item {
  position: relative;
  padding-top: 15px;
  flex: 1;
  padding-left: 70px;
  font-size: 24px;
  line-height: 30px;
  color: #c0c0c0;
  cursor: pointer;
}
.nav-wrapper .nav .nav-item > p:last-child {
  font-size: 12px;
  line-height: 20px;
}
.nav-wrapper .nav .nav-item::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 21px;
  display: block;
  width: 38px;
  height: 38px;
  background-repeat: no-repeat;
  background-position: center;
}
.nav-wrapper .nav .nav-item:nth-child(1)::before {
  background-image: url('../img/about_nav_1.png');
}
.nav-wrapper .nav .nav-item:nth-child(2)::before {
  background-image: url('../img/about_nav_2.png');
}
.nav-wrapper .nav .nav-item:nth-child(3)::before {
  background-image: url('../img/about_nav_3.png');
}
.nav-wrapper .nav .nav-item:nth-child(4)::before {
  background-image: url('../img/about_nav_4.png');
}
.nav-wrapper .nav .nav-item:nth-child(5)::before {
  background-image: url('../img/about_nav_5.png');
}
.nav-wrapper .nav .nav-item::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  width: 0;
  height: 3px;
  background-color: transparent;
  transition: width 0.2s;
  transform: translateX(-50%);
}
.nav-wrapper .nav .nav-item.active,
.nav-wrapper .nav .nav-item:hover {
  color: #1e98c5;
}
.nav-wrapper .nav .nav-item.active::after,
.nav-wrapper .nav .nav-item:hover::after {
  background-color: #1e98c5;
  width: 100%;
}
.nav-wrapper .nav .nav-item.active:nth-child(1)::before,
.nav-wrapper .nav .nav-item:hover:nth-child(1)::before {
  background-image: url('../img/about_nav_1_active.png');
}
.nav-wrapper .nav .nav-item.active:nth-child(2)::before,
.nav-wrapper .nav .nav-item:hover:nth-child(2)::before {
  background-image: url('../img/about_nav_2_active.jpg');
}
.nav-wrapper .nav .nav-item.active:nth-child(3)::before,
.nav-wrapper .nav .nav-item:hover:nth-child(3)::before {
  background-image: url('../img/about_nav_3_active.jpg');
}
.nav-wrapper .nav .nav-item.active:nth-child(4)::before,
.nav-wrapper .nav .nav-item:hover:nth-child(4)::before {
  background-image: url('../img/about_nav_4_active.jpg');
}
.nav-wrapper .nav .nav-item.active:nth-child(5)::before,
.nav-wrapper .nav .nav-item:hover:nth-child(5)::before {
  background-image: url('../img/about_nav_5_active.jpg');
}
.about-content {
  position: relative;
  padding-bottom: 150px;
}
.about-content .content-wrapper {
  width: 1200px;
  margin: 0 auto;
}
.about-content .content-title {
  position: relative;
  font-size: 26px;
  color: #1e98c5;
  margin-top: 186px;
  margin-bottom: 50px;
  padding-left: 40px;
}
.about-content .content-title::after {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 18px;
  height: 48px;
  background-color: #1e98c5;
}
.about-content .content-title > div:first-child {
  font-size: 50px;
  padding-bottom: 20px;
}
.about-content .content-title > div:last-child {
  font-size: 34px;
}
.company-profile {
  text-align: center;
  display: flex;
}
.company-profile div {
  flex: 1;
  padding-right: 22px;
  text-indent: 2em;
  text-align: left;
  font-size: 20px;
  line-height: 42px;
  color: #333;
}
.company-profile img {
  width: 577px;
  height: 410px;
}
.development-nav {
  position: relative;
  overflow: hidden;
  height: 100px;
  padding-top: 10px;
}
.development-nav ul {
  transform: translateX(-40px);
  display: flex;
  font-size: 24px;
  z-index: 1;
  position: relative;
  left: 50%;
  transition: transform 0.4s;
}
.development-nav ul li {
  box-sizing: border-box;
  width: 80px;
  height: 80px;
  line-height: 76px;
  text-align: center;
  border: 2px solid #c0c0c0;
  color: #c0c0c0;
  background-color: #fff;
  border-radius: 50%;
  margin-right: 30px;
  cursor: pointer;
  transition: transform 0.2s;
  user-select: none;
}
.development-nav ul li.active,
.development-nav ul li:hover {
  background-color: #1e98c5;
  color: #fff;
  border-color: #1e98c5;
  transform: scale(1.2);
}
.base-line {
  position: absolute;
  top: 990px;
  left: 0;
  margin-top: -1px;
  width: 100%;
  height: 2px;
  background-color: silver;
}
.development-content {
  display: flex;
  padding-top: 100px;
}
.development-content img {
  display: block;
  flex: 1;
  height: 554px;
  width: 600px;
}
.development-content > div {
  flex: 1;
  padding: 20px 30px;
  background-color: #eee;
  color: #000;
}
.development-content > div .development-year {
  font-size: 60px;
  line-height: 70px;
}
.development-content > div ul {
  height: 424px;
  overflow: auto;
}
.development-content > div ul li {
  margin-top: 40px;
  font-size: 20px;
  line-height: 26px;
}
.development-content > div ul li .development-month {
  font-size: 26px;
  vertical-align: bottom;
}
.development-content .development-item {
  display: none;
}
.development-content .development-item.active {
  display: block;
}
.culture-wrapper ul {
  display: flex;
  justify-content: space-between;
}
.culture-wrapper ul li {
  padding: 40px 16px;
  box-sizing: border-box;
  width: 388px;
  height: 248px;
  font-size: 30px;
  background-color: #eee;
  cursor: pointer;
  position: relative;
}
.culture-wrapper ul li .line {
  width: 356px;
  height: 2px;
  background-color: #c0c0c0;
  margin: 30px 0;
}
.culture-wrapper ul li div {
  position: relative;
  z-index: 1;
}
.culture-wrapper ul li .culture-en {
  color: #1e98c5;
}
.culture-wrapper ul li p {
  position: relative;
  z-index: 1;
  font-size: 16px;
}
.culture-wrapper ul li::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.6s;
}
.culture-wrapper ul li:nth-child(1)::before {
  background: url('../img/culture_bg_1.png') no-repeat center;
}
.culture-wrapper ul li:nth-child(2)::before {
  background: url('../img/culture_bg_2.png') no-repeat center;
}
.culture-wrapper ul li:nth-child(3)::before {
  background: url('../img/culture_bg_3.png') no-repeat center;
}
.culture-wrapper ul li.active {
  color: #fff;
}
.culture-wrapper ul li.active .line {
  background-color: #fff;
}
.culture-wrapper ul li.active .culture-en {
  color: #fff;
}
.culture-wrapper ul li.active::before {
  opacity: 1;
}
.activities-wrapper {
  width: 1200px;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
}
.activities-wrapper .activities-item {
  position: relative;
  width: 390px;
  margin-right: 15px;
  margin-bottom: 30px;
  cursor: pointer;
}
.activities-wrapper .activities-item:nth-child(3n) {
  margin-right: 0;
}
.activities-wrapper .activities-item .item-img {
  display: block;
  overflow: hidden;
}
.activities-wrapper .activities-item .item-img img {
  width: 100%;
  transition: all 0.4s;
}
.activities-wrapper .activities-item .item-img:hover img {
  transform: scale(1.1);
}
.activities-wrapper .activities-item img {
  display: block;
}
.activities-wrapper .activities-item .item-title {
  text-align: center;
  width: 100%;
  height: 54px;
  color: #fff;
  background-color: #eee;
  color: #000;
  line-height: 54px;
  font-size: 20px;
}
.activities-wrapper .activities-item:hover .item-title {
  color: #fff;
  background-color: #1e98c5;
}
.map-link {
  position: relative;
  cursor: pointer;
  display: block;
}
.map-link .map-position {
  position: absolute;
  top: 240px;
  left: 800px;
  animation: mapAnim 2s ease-in-out infinite;
}
.map-link .map-info {
  position: absolute;
  top: 170px;
  right: 420px;
  opacity: 0;
  transform: scale(0.4);
  transform-origin: right center;
  transition: all 0.3s ease-out;
}
.map-link:hover .map-info {
  display: block;
  opacity: 1;
  transform: scale(1);
}