body * {
  box-sizing: border-box;
  flex-shrink: 0;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
html,
body {
  margin: 0;
  padding: 0;
  font-family:
    PingFangSC-Regular,
    Roboto,
    Helvetica Neue,
    Helvetica,
    Tahoma,
    Arial,
    PingFang SC-Light,
    Microsoft YaHei;
}
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s ease-out,
    transform 0.5s ease-out;
}
.stagger-children > *.visible {
  opacity: 1;
  transform: translateY(0);
}
.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
}
.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
}
.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}
.scale-in {
  opacity: 0;
  transform: scale(0.8);
  transition:
    opacity 0.4s ease-out,
    transform 0.4s ease-out;
}
.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* 回到顶部按钮样式 */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #007CFF, #40B2F9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(70, 153, 248, 0.3);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(70, 153, 248, 0.3);
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top svg {
  color: white;
  width: 20px;
  height: 20px;
}

/* 顶部导航 */
.top {
  width: 100%;
  height: 0.44rem;
  padding: 0.1rem 0.2rem;
  background-color: rgba(255, 255, 255, 0.123);
  position: fixed;
  left: 0;
  top: 0;
  z-index: 9999999;
}

.top-logo {
  width: 0.3rem;
  height: 0.31rem;
  margin-right: 0.06rem;
}
.top-title {
  font-family:
    Noto Sans SC,
    Noto Sans SC;
  font-weight: bold;
  font-size: 0.08rem;
  color: #10324f;
  line-height: 0.13rem;
  letter-spacing: 3px;
}

.top nav a {
  font-family:
    Noto Sans SC,
    Noto Sans SC;
  font-weight: 500;
  font-size: 0.06rem;
  color: #6b7280;
  line-height: 0.09rem;
  letter-spacing: 3px;
  text-decoration: none;
  margin-right: 0.33rem;
  transition: color 0.3s ease;
}

.top nav a:hover {
  color: #10324f;
  text-decoration: underline;
  text-underline-offset: 0.05rem;
}

.top nav a.active {
  color: #10324f;
  text-decoration: underline;
  text-underline-offset: 0.05rem;
}
/* 主页 */
.content-section {
  position: relative;
  text-align: center;
  height: 11.25rem;
  background: url(../images/index/top-bg.jpg) no-repeat center center;
  background-size: cover;
}
.content-section .top-content {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 5.63rem;
  padding: 0.41rem 0.5rem;
  background: #ffffff;
  border-radius: 0.27rem;
  background: url(../images/index/card-bg.png) no-repeat center center;
  background-size: cover;
}
.content-section .top-content .middle {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}
.content-section .top-content .middle .btn-box {
  width: 1.53rem;
  height: 0.39rem;
  padding: 0.07rem 0.1rem;
  border-radius: 0.24rem;
  border: 0.01rem solid #ffffff;
  margin-bottom: 0.48rem;
}
.content-section .top-content .middle .btn-box button {
  width: 1.32rem;
  height: 0.24rem;
  background: #ffffff;
  border-radius: 0.24rem;
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.08rem;
  color: #3d3d3d;
  line-height: 0.24rem;
  letter-spacing: 1px;
  text-align: center;
}
.content-section .top-content .middle .title {
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.57rem;
  color: #ffffff;
  line-height: 0.22rem;
  letter-spacing: 1px;
  text-align: center;
}
.content-section .top-content .content-one .left span {
  width: 0.24rem;
  height: 0.24rem;
  background-color: #0d2f4e;
  border-radius: 50%;
}
.content-section .top-content .content-one .left span:last-child {
  background-color: #1c7fef;
  margin-left: 0.04rem;
}
.content-section .top-content .content-one .desc {
  width: 1.94rem;
  font-family: Inter, Inter;
  font-weight: normal;
  font-size: 0.1rem;
  color: #5884a5;
  line-height: 0.13rem;
  letter-spacing: 1px;
  margin: 0.21rem 0;
  text-align: left;
}
.content-section .top-content .link {
  font-family: Inter, Inter;
  font-weight: normal;
  font-size: 0.08rem;
  color: #314259;
  line-height: 0.13rem;
  letter-spacing: 1px;
  text-decoration-line: underline;
  text-transform: none;
}
.content-section .top-content .achievements {
  padding: 0 0.07rem;
  height: 0.17rem;
  border-radius: 0.17rem;
  border: 0.01rem solid #314259;
  font-family: Inter, Inter;
  font-weight: normal;
  font-size: 0.08rem;
  color: #314259;
  line-height: 0.13rem;
  letter-spacing: 1px;
}
.content-section .top-content .line {
  width: 1.54rem;
  height: 0rem;
  border-bottom: 0.01rem solid #e5e5e5;
  margin: 0.11rem 0 0.16rem;
}
.content-section .top-content .num-box {
  margin-bottom: 0.18rem;
}
.content-section .top-content .num-box .num {
  font-family: Inter, Inter;
  font-weight: 400;
  font-size: 0.33rem;
  color: #147bee;
  line-height: 0.13rem;
  letter-spacing: 1px;
}
.content-section .top-content .num-box span:last-child {
  width: 0.53rem;
  height: 0.38rem;
  font-family: Inter, Inter;
  font-weight: 500;
  font-size: 0.08rem;
  color: #314259;
  line-height: 0.13rem;
  letter-spacing: 1px;
  margin-left: 0.25rem;
  text-align: left;
}
.content-section .top-content .content-two {
  margin-top: 0.3rem;
}
.content-section .top-content .content-two img {
  width: 2.95rem;
  height: 2.3rem;
}
.content-section .top-content .content-two .left {
  width: 5.16rem;

  padding-top: 0.49rem;
}
.content-section .top-content .content-two .left .title {
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.21rem;
  color: #062242;
  line-height: 0.24rem;
  letter-spacing: 1px;
  text-align: left;
}
.content-section .top-content .content-two .desc {
  font-family: Inter, Inter;
  font-weight: normal;
  font-size: 0.08rem;
  color: #688faf;
  line-height: 0.13rem;
  letter-spacing: 1px;
  text-align: left;
  margin: 0.17rem 0;
}
.challenge-section {
  width: 100%;
  height: 5.58rem;
  padding: 0 0.69rem;
  margin-top: -1rem;
  z-index: 9999;
  position: relative;
}
.challenge-section .content {
  height: 100%;
  background: url(../images/index/card-bg-earth.png) no-repeat center center;
  background-size: cover;
}
.challenge-section .content .content-text {
  padding-top: 2.94rem;
  text-align: center;
}
.challenge-section .content .content-text .title {
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.25rem;
  color: #ffffff;
  line-height: 0.38rem;
  letter-spacing: 1px;
}
.challenge-section .content .content-text .desc {
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.08rem;
  color: #759ebe;
  line-height: 0.22rem;
  letter-spacing: 1px;
  margin: 0.26rem 0 0.16rem;
}
.challenge-section .content .content-text .btn {
  width: 1.35rem;
  height: 0.31rem;
  border-radius: 0.32rem;
  border: 0.01rem solid #ffffff;
  font-family: Inter, Inter;
  font-weight: bold;
  font-size: 0.08rem;
  color: #ffffff;
  line-height: 0.31rem;
  letter-spacing: 1px;
}
.comprehensive-section {
  padding: 0.57rem 1.13rem 0.91rem;
  gap: 0.6rem;
  text-align: center;
}
.comprehensive-section .section-title {
  font-family:
    PingFang SC,
    PingFang SC;
  font-weight: 600;
  font-size: 0.21rem;
  color: #0f172a;
  line-height: 0.23rem;
}
.comprehensive-section .list-item {
  margin-top: 0.67rem;
}
.comprehensive-section .list-item img {
  width: 2.89rem;
  height: 2.09rem;
}
.comprehensive-section .list-item .title {
  width: 1.45rem;
  height: 0.23rem;
  font-family:
    PingFang SC,
    PingFang SC;
  font-weight: 600;
  font-size: 0.19rem;
  color: #0f172a;
  line-height: 0.23rem;
  text-align: left;
  font-style: normal;
  text-transform: none;
}
.comprehensive-section .list-item .desc {
  width: 4.2rem;
  font-family:
    PingFang SC,
    PingFang SC;
  font-weight: 600;
  font-size: 0.08rem;
  color: #668cac;
  line-height: 0.13rem;
  text-align: left;
  margin: 0.28rem 0;
}
.comprehensive-section .list-item .link {
  font-family: Inter, Inter;
  font-weight: normal;
  font-size: 0.08rem;
  color: #237cef;
  line-height: 0.13rem;
  letter-spacing: 1px;
  text-align: left;
  text-decoration-line: underline;
}