* {
  margin: 0;
  padding: 0;
}

.header_box{
  width: 100%;
  padding: calc(2px + 0.1rem) 0;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  background: #ffffff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.header{
  max-width: 1600px;
  width: 90%;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header .logo{
  width: calc(31px + 15rem);
}
.header .logo img{
  width: 100%;
}
.header_right{
  flex: 1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.header_nav{
display: flex;
justify-content: flex-end;
align-items: center;
gap: calc(7px + 4rem);
}
.header_nav_item{
font-family: DM_Sans_regular;
font-weight: 400;
font-size: calc(8px + 0.5rem);
color: #000000;
line-height: calc(3px + 1rem);
}
.lang_dropdown{
  position: relative;
  margin-left: calc(10px + 3rem);
}
.lang_current{
  display: flex;
  justify-content: center;
  align-items: center;
  gap: calc(3px + 0.25rem);
  font-family: DM_Sans_regular;
  font-weight: 400;
  font-size: calc(6px + 0.5rem);
  color: #000000;
  line-height: calc(3px + 1rem);
  cursor: pointer;
  transition: color 0.3s ease;
}
.lang_current:hover{
  color: #06ADA9;
}
.lang_current img{
  width: 15px;
  height: 10px;
  transition: transform 0.3s ease;
}
.lang_menu{
  position: absolute;
  top: 100%;
  right: 0;
  background: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  list-style: none;
  padding: 5px 0;
  margin: 5px 0 0 0;
  min-width: 120px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 100;
}
.lang_menu.show{
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang_menu_item{
  font-family: DM_Sans_regular;
  font-weight: 400;
  font-size: calc(4px + 0.5rem);
  color: #333333;
  padding: 8px 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}
.lang_menu_item:hover{
  background: #f5f5f5;
  color: #06ADA9;
}
.lang_menu_item.active{
  color: #06ADA9;
  font-weight: 500;
}
.line{
  width: 1px;
height: calc(4px + 0.5rem);
background: #000000;
margin-left: calc(9px + 1.5rem);
}
.sousuo{
  margin-left: calc(1px + 2rem);
}
.sousuo img{
  width: calc(8px + 0.5rem);
}
.header_nav_item_act{
  color: #06ADA9;
}

/* Mobile Menu Button */
.mobile_menu_btn{
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 5px;
  margin-left: calc(5px + 1rem);
}
.mobile_menu_btn span{
  display: block;
  width: 24px;
  height: 2px;
  background-color: #000000;
  transition: all 0.3s ease;
}

@media screen and (max-width: 1440px) {
  .header{
    width: 94%;
  }
  .header_nav{
    gap: calc(7px + 2.5rem);
  }
  .header_nav_item{
    font-size: calc(6px + 0.5rem);
  }
  .lang_dropdown{
    margin-left: calc(10px + 2rem);
  }
  .line{
    margin-left: calc(7px + 1rem);
  }
  .sousuo{
    margin-left: calc(1px + 1.5rem);
  }
}

@media screen and (max-width: 1200px) {
  .header{
    width: 95%;
  }
  .header_nav{
    gap: calc(5px + 1.5rem);
  }
  .header_nav_item{
    font-size: calc(4px + 0.5rem);
  }
  .lang_dropdown{
    margin-left: calc(6px + 1rem);
  }
  .lang_current{
    font-size: calc(5px + 0.5rem);
  }
  .line{
    margin-left: calc(5px + 0.75rem);
  }
  .sousuo{
    margin-left: calc(1px + 1rem);
  }
}

@media screen and (max-width: 992px) {
  .header{
    width: 96%;
  }
  .header_nav{
    gap: calc(5px + 1rem);
  }
  .header_nav_item{
    font-size: 14px;
  }
}

@media screen and (max-width: 768px) {
  .header_box{
    padding: 10px 0;
  }
  .header{
    width: 100%;
    padding: 0 15px;
    box-sizing: border-box;
  }
  .header .logo{
    width: 160px;
    flex-shrink: 0;
  }
  .header_right{
    gap: 0;
  }
  .mobile_menu_btn{
    display: flex;
  }
  .header_nav{
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 10px 15px;
    display: none;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  }
  .header_nav.show{
    display: flex;
  }
  .header_nav_item{
    width: 100%;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    font-size: 15px;
  }
  .header_nav_item:last-child{
    border-bottom: none;
  }
  .header_nav_item a{
    display: block;
    padding: 12px 0;
    color: #000000;
    text-decoration: none;
    font-size: 15px;
  }
  .header_nav_item_act a{
    color: #06ADA9;
  }
  .lang_dropdown{
    margin-left: 0;
  }
  .lang_current{
    font-size: 12px;
  }
  .lang_current img{
    width: 8px;
    height: 8px;
  }
  .lang_menu{
    min-width: 110px;
  }
  .lang_menu_item{
    font-size: 12px;
    padding: 8px 12px;
  }
  .sousuo{
    margin-left: 12px;
  }
  .sousuo img{
    width: 18px;
  }
  .line{
    display: none;
  }
}

@media screen and (max-width: 480px) {
  .header_box{
    padding: 8px 0;
  }
  .header{
    padding: 0 10px;
  }
  .header .logo{
    width: 130px;
  }
  .mobile_menu_btn{
    width: 36px;
    height: 36px;
    margin-left: 8px;
  }
  .mobile_menu_btn span{
    width: 20px;
  }
  .header_nav_item a{
    font-size: 14px;
    padding: 10px 0;
  }
  .lang_current{
    font-size: 11px;
  }
  .lang_menu{
    min-width: 100px;
  }
  .lang_menu_item{
    font-size: 11px;
    padding: 6px 10px;
  }
  .sousuo{
    margin-left: 8px;
  }
  .sousuo img{
    width: 16px;
  }
}