/* 头部css :start */
.header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 3.125vw;
  line-height: 3.125vw;
  position: relative;
  backdrop-filter: blur(20px); /* 调整模糊值 */
  background-color: rgba(0, 0, 0, 0.2);
  position: fixed;
  top: 0;
  z-index: 12;
}

.header__logo {
  position: absolute;
  left: 1.25vw;
  height: 1.5625vw;
  overflow: hidden;
  line-height: 3.125vw;
}

.header__logo-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.header__logo-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: inherit;
}

.header__nav-list {
  display: flex;
  gap: 1.6667vw;
  list-style: none;
  margin: 0;
  padding: 0;
}

.header__nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .3125vw;
  position: relative;
  transition: all 0.3s ease;
}


.header__nav-link {
  font-size: 1.04167vw;
  font-weight: 400;
  text-align: left;
  color: #ffffff;
  text-decoration: none;
  transition: all 0.3s ease;
  line-height: normal;
  font-family: 'Roboto-Regular', sans-serif;
}

.header__nav-link--active {
  color: #ffffff;
  opacity: 1;
  position: relative;
  transition: all 0.3s ease; 
  font-family: 'Roboto-Medium', sans-serif;
}
.header__nav-link--active::after {
  content: '';
  width: 1.25vw;
  height: .1563vw;
  background: #ffffff;
  border-radius: 2px;
  position: absolute;
  top: 1.5625vw;
}
.header__nav-link--active:hover {
  transform: scale(1) !important;
}
.header__nav-link--active .header__nav-link {
  opacity: 1;
}

.header__bottom-border {
  background: linear-gradient(270deg, #fff0, #fff 51.35135135135135%, #fff0);
  bottom: 0;
  flex: none;
  height: 1px;
  left: calc(50.00000000000002% - 100vw / 2);
  opacity: .2;
  overflow: hidden;
  position: absolute;
  width: 100vw;
  z-index: 1;
}

/* 头部css end */