/**
 * 导航栏样式（借鉴 wwh 2025 模板方案）
 * 固定透明头部 + 下拉子菜单 + 全屏搜索层 + 移动端抽屉
 * 强调色统一使用站点主色 --primary-color
 */

/* ===== 头部容器 ===== */
.header {
    position: fixed;
    width: 100%;
    height: 5rem;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, .09);
    transition: 0.3s;
}

.header .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: static;
    height: 100%;
    width: 90%;
    max-width: 1920px;
    margin: auto;
}

.header .header-logo { flex-shrink: 0; }
.header .header-logo a { display: flex; height: 100%; align-items: center; }
.header .header-logo img { display: block; width: 13rem; transition: 0.5s; }

/* 单 logo：透明态用滤镜转白，滚动/悬停还原彩色 */
.header .header-logo img { filter: brightness(0) invert(1); transition: 0.5s; }
.header.scrolled .header-logo img,
.header:hover .header-logo img { filter: none; }

.header .nav-box {
    margin-left: 3rem;
    display: flex;
    justify-content: space-between;
    flex-grow: 1;
    float: right;
}

.header .nav-menu { list-style: none; width: 100%; margin: 0; padding: 0; }
.header .nav-menu li { position: relative; }
.header .nav-menu a {
    color: #333;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    letter-spacing: 0.3px;
}
.header .nav-menu ul {
    list-style: none;
    margin: 0;
    padding: 0;
    background: #FFFFFF;
}

.header .nav-menu .submenu-toggle {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.header .nav-menu .submenu-toggle::after {
    content: '';
    width: 6px;
    height: 6px;
    border: 2px solid #333;
    border-left: 0;
    border-top: 0;
    display: block;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header .nav-button { display: flex; margin-left: 2rem; }

/* 语言切换 */
.header .nav-button .language {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
    transition: .3s;
}
.header .nav-button .language > a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: #fff;
}
.header .nav-button .language span {
    margin-left: .75rem;
    margin-right: .375rem;
    font-size: .875rem;
    white-space: nowrap;
    transition: .5s;
}
.header .nav-button .language .language-show {
    position: absolute;
    left: 0;
    top: 100%;
    width: 130px;
    opacity: 0;
    visibility: hidden;
    transform-origin: center top;
    background-color: #FFFFFF;
    transform: scaleY(0);
    box-shadow: 0px 8px 36.8px 3.2px rgba(0, 0, 7, 0.08);
    transition: 0.5s;
    border-radius: 6px;
    overflow: hidden;
}
.header .nav-button .language:hover .language-show { opacity: 1; visibility: visible; transform: scaleY(1); }
.header .nav-button .language .language-show a {
    display: block;
    text-align: left;
    justify-content: flex-start !important;
    padding: 15px 35px 15px 25px;
    font-size: 14px;
    color: #333;
    position: relative;
    z-index: 1;
    transition: all 0.2s ease;
}
.header .nav-button .language .language-show a:hover { color: #fff; background: var(--primary-color); }

/* 购物车（询价/获取报价入口）：按需求隐藏 */
.header .nav-button .cart {
    display: none;
}
.header .nav-button .cart > a {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}
.header .nav-button .cart .cart-count {
    position: absolute;
    top: -6px;
    left: 16px;
    min-width: 18px;
    height: 15px;
    padding: 0 4px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 10px;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 搜索按钮 */
.header .nav-button .search-btn {
    display: flex;
    margin-left: 2rem;
    align-items: center;
    position: relative;
    z-index: 1;
    transition: .3s;
}
.header .nav-button .search-btn a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: #fff;
}

/* ===== 滚动 / 悬停：白底深色 ===== */
.header.scrolled { background: #fff; border-bottom: 1px solid #e6e6e6; }
.header.scrolled .nav-menu > li > a { color: #333; }
.header.scrolled .nav-button .language > a,
.header.scrolled .nav-button .search-btn > a,
.header.scrolled .nav-button .cart > a { color: #333; }
.header.scrolled .nav-button .language svg > path,
.header.scrolled .nav-button .search-btn svg > path { stroke: #333333; }
.header.scrolled .nav-button .cart svg rect,
.header.scrolled .nav-button .cart svg path { stroke: #333333; }

.header:hover { background: #fff; box-shadow: 0px 8px 36.8px 3.2px rgba(0, 0, 7, 0.08); }
.header:hover .nav-menu > li > a { color: #333333; }
.header:hover .nav-menu > li > a::after { background: var(--primary-color); }
.header:hover .nav-button .language > a,
.header:hover .nav-button .search-btn > a,
.header:hover .nav-button .cart > a { color: #333; }
.header:hover .nav-button .language svg > path,
.header:hover .nav-button .search-btn svg > path { stroke: #333333; }
.header:hover .nav-button .cart svg rect,
.header:hover .nav-button .cart svg path { stroke: #333333; }

.header .m-search { display: none; }

/* ===== 桌面端（≥768px；低于此宽度导航放不下，改用移动端抽屉） ===== */
@media (min-width: 768px) {
    .header .nav-toggle { display: none; }
    .header .nav-menu { display: flex; align-items: center; height: 100%; }
    .header .nav-menu > li { height: 100%; display: flex; align-items: center; margin: 0 1.25rem; flex-shrink: 0; }
    .header .nav-menu > li > a { line-height: 5rem; align-items: center; font-size: 1.125rem; color: #fff; white-space: nowrap; }
    .header .nav-menu > li > a:after {
        content: "";
        display: block;
        width: 0;
        height: 2px;
        transition: .5s;
        background: #FFFFFF;
        position: absolute;
        right: 0;
        bottom: 20%;
        border-radius: 3px;
    }
    .header.scrolled .nav-menu > li > a:after { background: var(--primary-color); }
    .header .nav-menu > li.active > a:after,
    .header .nav-menu > li:hover > a:after,
    .header.scrolled .nav-menu > li.active > a:after,
    .header.scrolled .nav-menu > li:hover > a:after { width: 100%; left: 0; right: auto; }

    .header .nav-menu ul {
        position: absolute;
        min-width: 160px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0px 8px 36.8px 3.2px rgba(0, 0, 7, 0.08);
        z-index: 1000;
        border-radius: 6px;
    }
    .header .nav-menu > li > ul { top: 100%; left: 0; }
    .header .nav-menu ul ul { top: 10px; left: 100%; transform: translateX(10px); }
    .header .nav-menu li:hover > ul { opacity: 1; visibility: visible; transform: translate(0); }
    .header .nav-menu ul li { width: 100%; }
    .header .nav-menu ul a {
        color: #333;
        padding: 15px 35px 15px 25px;
        white-space: nowrap;
        width: 100%;
        font-size: 14px;
        transition: all 0.2s ease;
        position: relative;
        display: block;
    }
    .header .nav-menu ul li:hover > a { color: #fff; }
    .header .nav-menu ul li:hover > a::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--primary-color);
        z-index: -1;
        border-radius: 0;
    }
    .header .nav-menu ul li:first-child:hover > a::after { border-radius: 6px 6px 0 0; }
    .header .nav-menu ul li:last-child:hover > a::after { border-radius: 0 0 6px 6px; }
    .header .nav-menu ul li:first-child:last-child:hover > a::after { border-radius: 6px; }

    .header .nav-menu > li.has-children > .submenu-toggle { display: none; }
    .header .nav-menu .submenu-toggle { width: 20px; height: 20px; right: 10px; }
    .header .nav-menu .submenu-toggle::after { transform: rotate(-45deg); width: 6px; height: 6px; border-width: 1.5px; }
    .header .nav-menu ul li:hover > .submenu-toggle::after { border-color: #fff; }
}

/* 中等桌面（1200–1439.98px）：适度压缩间距与字号 */
@media (min-width: 1200px) and (max-width: 1439.98px) {
    .header .header-logo img { width: 11rem; }
    .header .nav-box { margin-left: 1.5rem; }
    .header .nav-menu > li { margin: 0 1.25rem; }
    .header .nav-menu > li > a { font-size: 1rem; }
    .header .nav-button { margin-left: 1rem; }
    .header .nav-button .cart,
    .header .nav-button .language,
    .header .nav-button .search-btn { margin-left: 1rem; }
}

/* 较窄桌面（992–1199.98px）：进一步压缩 logo、间距与字号，保证导航单行完整显示 */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .header .header-logo img { width: 9.5rem; }
    .header .nav-box { margin-left: 1rem; }
    .header .nav-menu > li { margin: 0 .625rem; }
    .header .nav-menu > li > a { font-size: .9375rem; }
    .header .nav-button { margin-left: 1rem; }
    .header .nav-button .cart,
    .header .nav-button .language,
    .header .nav-button .search-btn { margin-left: .75rem; }
}

/* 平板 / 小桌面（768–991.98px）：进一步压缩 logo、间距与字号，导航仍保持单行 */
@media (min-width: 768px) and (max-width: 991.98px) {
    .header .header-content { width: 100%; padding: 0 15px; }
    .header .header-logo img { width: 8rem; }
    .header .nav-box { margin-left: .5rem; }
    .header .nav-menu > li { margin: 0 .375rem; }
    .header .nav-menu > li > a { font-size: .8125rem; }
    .header .nav-button { margin-left: .5rem; }
    .header .nav-button .cart,
    .header .nav-button .language,
    .header .nav-button .search-btn { margin-left: .375rem; }
}

/* ===== 全屏搜索层 ===== */
.search-screen-box {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 70vh;
    z-index: 1000000;
    opacity: 0;
    visibility: hidden;
    transition: .6s;
}
.search-screen-box:before {
    content: "";
    position: absolute;
    top: 0;
    height: 0;
    transition: .6s;
    left: 0;
    right: 0;
    z-index: 1;
    background-image: linear-gradient(270deg, var(--primary-color) 20%, transparent 100%);
}
.search-screen-box.active { opacity: 1; visibility: visible; }
.search-screen-box.active:before { height: 100%; }
.search-screen-box .search-bg {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 0;
    margin: 0;
    background-size: cover;
    background-repeat: no-repeat;
    transform-origin: center center;
    transition: height .8s cubic-bezier(.77, 0, .175, 1);
}
.search-screen-box .search-frame {
    position: absolute;
    left: 0;
    top: 30%;
    transform: translateY(-50%);
    width: 100%;
    z-index: 2;
}
.search-screen-box .search-frame .search-input {
    overflow: hidden;
    display: flex;
    width: 50rem;
    margin: 0 auto;
    padding-left: 1.5rem;
    background-color: rgba(0, 0, 0, .1);
    box-sizing: border-box;
    transition: all .3s;
    max-width: 94%;
    border-radius: 2.5rem;
}
.search-screen-box .search-frame .search-input input[type=text] {
    height: 3.75rem;
    flex-grow: 1;
    background-color: transparent;
    font-size: 16px;
    color: #fff;
    transition: all .3s;
}
.search-screen-box .search-frame .search-input input::placeholder { color: rgba(255, 255, 255, 0.6); }
.search-screen-box .search-frame .search-input .btn {
    width: 5rem;
    height: 3.75rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.search-screen-box .search-close {
    position: absolute;
    width: 3rem;
    height: 3rem;
    z-index: 10;
    right: 20px;
    top: 20px;
    background-color: rgba(255, 255, 255, .1);
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.search-screen-box .search-close:hover { transform: rotate(180deg); }

/* ===== 移动端（≤767.98px） ===== */
@media (max-width: 767.98px) {
    .header { height: 50px; }
    .header .header-content { width: 100%; padding: 0 15px; }
    .header .header-logo img { width: 126px; }
    .header .nav-box { margin-left: 0; margin-right: calc(3% + 60px); justify-content: flex-end; }
    .header .nav-button { margin-left: 0; height: 50px; }
    .header .nav-button .search-btn { display: none; }
    .header .nav-button .language .language-show { width: 90px; }
    .header .nav-button .language .language-show a { text-align: center; font-size: 13px; padding: 10px 5px 10px 5px; }
    .header .nav-button .language .language-show a:hover { padding-left: 0; }
    .header .nav-button .cart { margin-left: 1rem; }

    .header .nav-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        position: absolute;
        right: 3%;
        top: 50%;
        transform: translateY(-50%);
        cursor: pointer;
        z-index: 1000;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .header .nav-toggle:hover { background: rgba(255, 255, 255, 0.2); }
    .header .nav-toggle span {
        display: block;
        width: 23px;
        height: 2px;
        background: #ffffff;
        margin: 2px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        border-radius: 4px;
    }
    .header.scrolled .nav-toggle span,
    .header:hover .nav-toggle span { background: #333; }
    .header .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); background: #333; }
    .header .nav-toggle.active span:nth-child(2) { opacity: 0; transform: translateX(-10px); }
    .header .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); background: #333; }

    .header .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        padding-top: 50px;
        background: #f7f7f7;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
    }
    .header .nav-menu.active { transform: translateX(0); }
    .header .nav-menu li { position: relative; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
    .header .nav-menu a { padding: 20px 50px 20px 20px; font-size: 15px; transition: background-color 0.3s; }
    .header .nav-menu .submenu-toggle {
        width: 60px;
        height: 60px;
        position: absolute;
        right: 0;
        top: 0;
        transform: none;
        background: transparent;
        z-index: 2;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .header .nav-menu .submenu-toggle::after {
        content: '';
        width: 8px;
        height: 8px;
        border: 1px solid #777777;
        border-left: 0;
        border-top: 0;
        transform: rotate(45deg);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        opacity: 0.8;
    }
    .header .nav-menu li.menu-open > .submenu-toggle::after { transform: rotate(-135deg); opacity: 1; }
    .header .nav-menu > li > ul > li .submenu-toggle { width: 48px; height: 48px; }
    .header .nav-menu ul { display: none; }
    .header .nav-menu li.menu-open > ul { display: block; }
    .header .nav-menu > li {
        background: #f7f7f7;
        width: 90%;
        overflow: hidden;
        margin: 0 auto;
        border-bottom: 1px solid rgb(111 111 111 / 10%);
    }
    .header .nav-menu > li:first-child { border-top: none; }
    .header .nav-menu > li > ul > li { background: rgb(245, 245, 245); border-bottom-color: rgba(255, 255, 255, 0.05); }
    .header .nav-menu > li > ul > li > a { padding: 15px 50px 15px 35px; color: rgba(51, 51, 51, 0.8); }
    .header .nav-menu > li > ul > li > ul > li { background: rgb(238, 238, 238); }
    .header .nav-menu > li > ul > li > ul > li > a { padding: 15px 50px 15px 50px; color: rgba(51, 51, 51, 0.7); }
    .header .nav-menu > li > a { font-weight: bold; color: rgba(51, 51, 51, 0.9); }
    .header .nav-menu > li.menu-open > a { background: rgb(245, 245, 245); color: var(--primary-color); }
    .header .nav-menu > li > ul > li.menu-open > a { background: rgb(238, 238, 238); color: var(--primary-color); }
    .header .nav-menu > li > ul > li > ul > li.menu-open > a { background: rgb(230, 230, 230); color: var(--primary-color); }
    .header .nav-menu > li:last-child { border-bottom: none; }

    .header .m-search {
        font-size: 16px;
        border-radius: 5px;
        color: #fff;
        text-align: center;
        letter-spacing: 2px;
        overflow: hidden;
        width: 100%;
        height: 80px;
        display: block;
    }
    .header .m-search form {
        height: 40px;
        border-radius: 25px;
        background: rgb(255 255 255);
        position: relative;
        width: 23rem;
        margin: 20px auto;
        max-width: 92%;
    }
    .header .m-search input {
        font-size: 14px;
        color: #646464;
        height: 40px;
        line-height: 40px;
        padding-left: 20px;
        box-shadow: none;
        -webkit-appearance: none;
        float: left;
        border-right: 0;
        background: none;
    }
    .header .m-search .btn {
        position: absolute;
        cursor: pointer;
        top: 0;
        right: 0;
        width: 40px;
        height: 40px;
        line-height: 40px;
        border: 0;
        background: var(--primary-color);
        border-radius: 20px;
        color: #fff;
        display: flex;
        justify-content: center;
        align-items: center;
    }
}