html {
  --default-h: 100px;
  --header-height: 100px;
  --header-small-height: 100px;
}
@media (max-width: 1200px) {
  html {
    --default-h: calc(1rem + 0px);
    --header-height: calc(1rem + 0px);
  }
}
/**头部导航**/
/* .header-box {
  position: sticky;
  top: 0;
  z-index: 9;
  transform: translate(0,0);
  width: 100%;
  opacity: 1;
  background: #ffffff;
  transition: transform 0.4s ease, opacity 0.3s;
} */


/* 基础导航样式 - 初始透明状态 */
.header-box {
  position: fixed; /* 固定在顶部 */
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999; /* 确保导航在最上层 */
  transition: all 0.3s ease; /* 过渡动画，让样式变化更平滑 */
  /* background: transparent; 初始背景透明 */
  
}

#header {
 
  transition: all 0.3s ease;
}

/* 初始状态 - 文字和logo为白色 */
.menu-title-word {
  color: #fff;
  transition: color 0.3s ease;
}



/* 滚动后导航的样式 - 背景白、文字/LOGO黑 */
.header-box.scroll-active {
  background: #fff; /* 滚动后背景白色 */
  box-shadow: 0 2px 10px rgba(0,0,0,0.1); /* 可选：加阴影提升层次感 */
}

.header-box.scroll-active .menu-title-word {
  color: #000; /* 文字变黑 */
}

.header-box.scroll-active .logo-box .imgs img {
  filter: none; /* 恢复logo原色（黑色） */
}

/* 子菜单样式适配（若有） */
.header-box.scroll-active .sub-block .a-word {
  color: #000;
}

/* 移动端适配（可选） */
@media (max-width: 768px) {
  .header-box {
    padding: 0px 0;
  }
  .logo-box .imgs {
    position: relative;
    width: 200px!important; 
    height: 60px;
}
.dete_bamn {
        height: 200px;
        padding-top: 50px;
    }
.menu-title-word {   color: #333!important;   transition: color 0.3s ease; }
}


/* ====================== 终极修复 LOGO 滚动切换（白 ↔ 黑） ====================== */
/* 基础样式：默认显示白色logo，隐藏黑色logo */
.logo-box .imgs {
  position: relative; /* 保证两个logo重叠 */
  width: 400px; /* 根据实际logo尺寸调整 */
  height: 60px; /* 根据实际logo尺寸调整 */
}
.logo-box .logo {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 0.3s ease; /* 过渡动画更丝滑 */
}
.logo-white {
  opacity: 1; /* 默认显示白色 */
}
.logo-black {
  opacity: 0; /* 默认隐藏黑色 */
}

/* 滚动后：header添加scroll-active类，切换logo显示 */
.header-box.scroll-active .logo-white {
  opacity: 0; /* 隐藏白色 */
}
.header-box.scroll-active .logo-black {
  opacity: 1; /* 显示黑色 */
}

/* 补充header滚动后的背景（可选，增强视觉区分） */
.header-box {
  position: fixed; /* 固定顶部 */
  top: 0;
  left: 0;
  width: 100%;
  background: transparent; /* 顶部默认透明 */
  z-index: 999;
  transition: background 0.3s ease;
}
.header-box.scroll-active {
  background: #ffffff; /* 滚动后背景变白，突出黑色logo */
  box-shadow: 0 2px 8px rgba(0,0,0,0.1); /* 可选：加阴影增强层次感 */
}



.logo-box .imgs .i-h { display: none; } /* 初始隐藏黑色logo */
.header-box.scroll-active .logo-box .imgs .i { display: none; }
.header-box.scroll-active .logo-box .imgs .i-h { display: block; }

.header-box .form-type-a {
  margin-top: -25px;
  position: absolute;
  z-index: 2;
  left: 0;
  top: 100%;
  border-top: 1px solid #ccc;
  width: 100%;
  background: #ffffff;
  opacity: 0;
  pointer-events: none;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  transition: opacity 0.5s, margin 0.5s;
}
.header-box .form-type-a .form {
  width: var(--wrap-full-width);
}
.search-show .header-box .form-type-a {
  margin-top: 0;
  opacity: 1;
  pointer-events: auto;
}
#header {
  --h: var(--header-height);
  --color: #333333;
  --hover-color: var(--main-color);
  <!--box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);-->
  background-color: transparent;
  color: var(--color);
  transition: all 0.4s ease;
   
}
#header .logo-box {
  position: relative;
  z-index: 2;
  height: var(--h);
  transition: all 0.3s;
}
#header .logo-box .imgs {
  position: relative;
}
#header .logo-box .imgs img {
  display: block;
  height: 100%;
  transition: height 0.3s, opacity 0.3s;
}
#header .logo-box .imgs .i {
  opacity: 1;
}
#header .logo-box .imgs .i-h {
  position: absolute;
  left: 0;
  top: 0;
  
}
#header .right-box {
  position: relative;
  z-index: 2;
}
#header .right-box .line {
  margin: 0 24px;
  width: 1px;
  height: 14px;
  background-color: #222222;
  opacity: 0.15;
}
#header .search-check {
  --size: 20px;
  --fill: #333333;
}
#header .search-check:hover {
  --fill: var(--main-color);
}
@media (min-width: 1201px) {
  #header .logo-box .imgs {
    height: 56px;
  }
  #header .menu-block .wrap-div {
    width: auto;
  }
  #header .menu-block .menu {
    --i-h: var(--h);
    --pad: calc(var(--wrap-full-width)*0.011);
    margin-right: var(--pad);
    font-size: 18px;
    line-height: var(--i-h);
    color: #333333;
  }
  #header .menu-block .menu .menu-son {
    position: relative;
    background: transparent;
  }
  #header .menu-block .menu .menu-son:hover .menu-title,
  #header .menu-block .menu .menu-son.on .menu-title {
    color: #ffffff;
  }
  #header .menu-block .menu .menu-son:hover .menu-title::before,
  #header .menu-block .menu .menu-son.on .menu-title::before {
    opacity: 1;
  }
  #header .menu-block .menu .menu-son:hover .sub-block {
    margin-top: 0;
    opacity: 1;
    pointer-events: auto;
  }
  #header .menu-block .menu .menu-title {
    position: relative;
    overflow: hidden;
    padding: 0 var(--pad);
    text-align: center;
    transition: all 0.3s;
  }
  #header .menu-block .menu .menu-title::before {
    content: "";
    display: block;
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
  border-bottom: 7px solid #2c9922;
    opacity: 0;
    transition: all 0.3s;
  }
  #header .menu-block .menu .menu-title-word {
    position: relative;
  }
  #header .menu-block .menu .sub-block {
    display: none!important;
    margin-top: 10px;
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    background: #ffffff;
    min-width: 100%;
    word-break: keep-all;
    white-space: nowrap;
    text-align: center;
    font-size: 0.88em;
    line-height: 1.6em;
    color: #666666;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s, margin 0.5s;
  }
  #header .menu-block .menu .sub-block .list-li {
    border-right: 1px solid #eaeaea;
    font-size: 0.9em;
    line-height: 1.4em;
    color: #888888;
  }
  #header .menu-block .menu .sub-block .list-li .a {
    --pad: 10px;
    display: block;
    position: relative;
    padding: 0.7em 1.8em;
  }
  #header .menu-block .menu .sub-block .list-li .a::before {
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: 100%;
    height: 1px;
    width: 100%;
    background: #f1f1f1;
  }
  #header .menu-block .menu .sub-block .list-li .a:hover {
    color: var(--main-color);
    background-color: #f3f3f3;
  }
  #header .phone-menu {
    display: none;
  }
  #header .phone-show-block {
    display: none;
  }
  /* .small-header .header-box {
    transform: translate(0,-100%);
  }
  .small-header.show-header .header-box {
    transform: translate(0,0);
  } */
}
@media (min-width: 1201px) and (max-width: 1400px) {
  #header .logo-box .imgs {
    height: 43px;
  }
  #header .menu-block .menu {
    --pad: calc(var(--wrap-full-width)*0.01);
  }
}
@media (min-width: 1201px) and (max-width: 1300px) {
  #header .menu-block .menu {
    --pad: calc(var(--wrap-full-width)*0.012);
    font-size: 16px;
  }
}
.small-header .header-box {
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}
.phone-menu {
  --background-color: var(--main-color);
  display: flex;
  position: relative;
  width: 44px;
  height: 30px;
}
.phone-menu .phone-menu-i {
  display: block;
  position: absolute;
  top: 50%;
  left: 0%;
  margin-top: -1px;
  transform: rotate(0);
  -webkit-transform: rotate(0);
  -moz-transform: rotate(0);
  -ms-transform: rotate(0);
  -o-transform: rotate(0);
  width: 100%;
  height: 2px;
  background-color: var(--background-color);
  opacity: 1;
  transition: all 0.3s;
}
.phone-menu .phone-menu-i.i1 {
  margin-top: -6px;
}
.phone-menu .phone-menu-i.i3 {
  margin-top: 4px;
}
.menu-show .phone-menu .phone-menu-i {
  background-color: var(--background-color);
}
.menu-show .phone-menu .phone-menu-i.i1 {
  margin-top: -1px;
  transform: rotate(45deg);
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
}
.menu-show .phone-menu .phone-menu-i.i2 {
  width: 100%;
  opacity: 0;
}
.menu-show .phone-menu .phone-menu-i.i3 {
  margin-top: -1px;
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
}
@media (max-width: 1200px) {
  .phone-menu {
    display: flex;
    position: relative;
    width: 0.44rem;
    height: 0.3rem;
  }
  .phone-menu .phone-menu-i {
    margin-top: -0.02rem;
    border-radius: 0.02rem;
    height: 0.04rem;
  }
  .phone-menu .phone-menu-i.i1 {
    margin-top: -0.15rem;
  }
  .phone-menu .phone-menu-i.i2 {
    margin-top: -0.02rem;
    width: 60%;
  }
  .phone-menu .phone-menu-i.i3 {
    margin-top: 0.11rem;
  }
}
@media (max-width: 1200px) {
  #header .logo-box {
    height: 1rem;
  }
  #header .logo-box .imgs {
    height: 64%;
  }
  #header .menu-block {
    position: fixed;
    z-index: 9;
    left: 0;
    top: var(--header-height);
    transform: translateX(-100%);
    width: 100%;
    height: calc(100vh - var(--header-height));
    padding-bottom: 1.5rem;
    opacity: 0;
    overflow-y: auto;
    background: #ffffff;
    pointer-events: none;
    transition: opacity 0.4s, transform 0.8s ease;
  }
  #header .menu-block::before {
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    pointer-events: none;
    width: 100%;
    height: 5px;
    box-shadow: 3px 4px 5px 0px rgba(236, 236, 236, 0.75);
  }
  #header .menu-block .menu {
    --l-h: 0.84rem;
    --default-color: #666666;
    padding-top: 0.2rem;
    flex-wrap: wrap;
    color: var(--default-color);
  }
  #header .menu-block .menu .menu-son {
    border-bottom: 1px solid #d3d3d3;
    width: 100%;
  }
  #header .menu-block .menu .menu-son .menu-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
    font-size: 0.28rem;
    line-height: var(--l-h);
  }
  #header .menu-block .menu .menu-son .menu-title .sub-icon {
    position: relative;
    height: var(--l-h);
    width: 0.62rem;
  }
  #header .menu-block .menu .menu-son .menu-title .sub-icon::before,
  #header .menu-block .menu .menu-son .menu-title .sub-icon::after {
    content: '';
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 0.015rem;
    background: #333333;
    transition: width 0.3s, height 0.3s, background 0.3s;
  }
  #header .menu-block .menu .menu-son .menu-title .sub-icon::before {
    width: 0.22rem;
    height: 0.03rem;
  }
  #header .menu-block .menu .menu-son .menu-title .sub-icon::after {
    width: 0.03rem;
    height: 0.22rem;
  }
  #header .menu-block .menu .menu-son .menu-title.on {
    color: var(--main-color);
  }
  #header .menu-block .menu .menu-son .menu-title.on .sub-icon::before,
  #header .menu-block .menu .menu-son .menu-title.on .sub-icon::after {
    background: var(--main-color);
  }
  #header .menu-block .menu .menu-son .menu-title.on .sub-icon::after {
    height: 0;
  }
  #header .menu-block .menu .sub-block {
    color: #666666;
    display: none;
    padding: 0;
    font-size: 0.26rem;
    line-height: calc(var(--l-h) - 0.2rem);
  }
  #header .menu-block .menu .sub-block .list-li {
    border-top: 1px solid #eeeeee;
    width: 100%;
  }
  #header .menu-block .menu .sub-block .list-li .a {
    display: block;
    padding: 0.1rem 0;
  }
  #header .search-check {
    --size: 0.34rem;
  }
  #header .right-box .line {
    margin: 0 0.8em;
    height: 0.26rem;
  }
  .menu-show #header {
    box-shadow: 3px 4px 5px 0px rgba(236, 236, 236, 0.75);
    background-color: #ffffff;
  }
  .menu-show #header .logo-box .imgs .i {
    opacity: 0;
  }
  .menu-show #header .logo-box .imgs .i-h {
    opacity: 1;
  }
  .menu-show #header .menu-block {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }
}