/* =========================================================
   Mega Dropdown 菜单（参照艾特信/tipray：左配图 + 右多列）
   hover 展开 / 左图右列 / 箭头旋转 / 桥接防误收 / 移动端隐藏
   ========================================================= */
.menu-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
}
.menu-nav > a,
.menu-nav > .has-dropdown > .parent-link {
    display: inline-flex;
    align-items: center;
    padding: 18px 16px;
    color: #333;
    font-size: 16px;
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.4;
    border-bottom: 2px solid transparent;
    transition: color .2s, border-color .2s;
}
.menu-nav > a:hover,
.menu-nav > a.active,
.menu-nav > .has-dropdown > .parent-link:hover,
.menu-nav > .has-dropdown:hover > .parent-link {
    color: var(--theme-color-primary, #5C97F7);
    border-bottom-color: var(--theme-color-primary, #5C97F7);
}

.nav-caret {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    vertical-align: middle;
    transition: transform .25s ease;
}
.has-dropdown:hover .nav-caret {
    transform: rotate(180deg);
}

.has-dropdown {
    position: relative;
    display: inline-block;
}

/* 悬停桥接：父项到面板之间的空隙，防止误收 */
.has-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 24px;
    z-index: 1;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    display: flex;
    gap: 28px;
    min-width: 860px;
    max-width: calc(100vw - 40px);
    background: #fff;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 18px 48px rgba(15, 40, 70, .16);
    border-top: 3px solid var(--theme-color-primary, #5C97F7);
    padding: 24px 28px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .25s ease, transform .25s ease, visibility .25s;
    z-index: 9999;
}
.has-dropdown:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

/* 左侧配图 + 文字蒙层 */
.dropdown-visual {
    position: relative;
    flex: 0 0 280px;
    width: 280px;
    height: 220px;
    border-radius: 8px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--theme-color-primary, #5C97F7), #1e4d8c);
}
.dropdown-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.dropdown-visual .visual-mask {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 28px 16px 14px;
    background: linear-gradient(to top, rgba(8, 28, 56, .78), rgba(8, 28, 56, 0));
    color: #fff;
}
.dropdown-visual .visual-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.3;
}
.dropdown-visual .visual-sub {
    margin-top: 4px;
    font-size: 12px;
    opacity: .9;
    line-height: 1.4;
}

/* 右侧多列子项 */
.dropdown-cols {
    flex: 1;
    min-width: 0;
    display: flex;
    gap: 0;
}
.dropdown-cols.cols-2 .dropdown-col {
    flex: 1 1 50%;
}
.dropdown-cols.cols-3 .dropdown-col {
    flex: 1 1 33.333%;
}
.dropdown-col {
    padding: 4px 20px;
    border-right: 1px solid #eef2f6;
    min-width: 0;
}
.dropdown-col:last-child {
    border-right: 0;
}
.dropdown-col:first-child {
    padding-left: 4px;
}
.dropdown-col:last-child {
    padding-right: 4px;
}
.dropdown-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.dropdown-col li {
    margin: 0;
}
.dropdown-col li a {
    display: block;
    padding: 9px 8px;
    color: #445566;
    font-size: 14px;
    line-height: 1.5;
    text-decoration: none;
    border-radius: 4px;
    transition: color .2s, background .2s, padding-left .2s;
}
.dropdown-col li a:hover {
    color: var(--theme-color-primary, #5C97F7);
    background: rgba(92, 151, 247, .08);
    padding-left: 12px;
}

/* 移动端隐藏下拉（走抽屉导航） */
@media (max-width: 992px) {
    .nav-dropdown {
        display: none !important;
    }
    .has-dropdown::after {
        display: none;
    }
    .nav-caret {
        display: none;
    }
    .menu-nav > a,
    .menu-nav > .has-dropdown > .parent-link {
        padding: 12px 14px;
        font-size: 15px;
    }
}


/* === FIX mobile blank: hide PC-only blocks / compact home === */
/* 公司简介块 PC 专用，手机端必须完全不占位 */
.m-hide { display: none !important; }

/* 手机端已有 m-cata 产品目录，隐藏桌面侧栏避免大段空白 */
@media (max-width: 992px) {
    .gaite-side { display: none !important; }
    .gaite-home-cols { display: block !important; }
    .gaite-home-cols .gaite-main { width: 100% !important; flex: auto !important; }
    /* scroll-animate 未触发时不要留下空白 */
    [data-scroll-animate] {
        opacity: 1 !important;
        transform: none !important;
        visibility: visible !important;
    }
    /* banner 不要超高 */
    .ub-banner .swiper-slide .cover:after {
        margin-top: 56% !important;
    }
}



/* === FIX: 导航强制一行 === */
.menu-nav {
    flex-wrap: nowrap !important;
    white-space: nowrap;
    min-width: 0;
}
.menu-nav > a,
.menu-nav > .has-dropdown > .parent-link {
    padding: 18px 11px !important;
    font-size: 15px !important;
    flex: 0 0 auto;
}
.menu-nav > .has-dropdown {
    flex: 0 0 auto;
}
.ub-header-b .nav {
    min-width: 0;
    flex: 1 1 auto;
}
.ub-header-b .nav .search {
    flex: 0 0 auto;
    margin-left: 8px;
}
@media (max-width: 1280px) {
    .menu-nav > a,
    .menu-nav > .has-dropdown > .parent-link {
        padding: 18px 8px !important;
        font-size: 14px !important;
    }
}
@media (max-width: 992px) {
    .menu-nav {
        flex-wrap: wrap !important;
    }
}



/* === FIX mobile banner blank: slide 勿被撑高，高度由 cover 比例决定 === */
@media (max-width: 992px) {
    .ub-banner,
    .ub-banner .swiper-container,
    .ub-banner .swiper-wrapper,
    .ub-banner .swiper-slide {
        height: auto !important;
        max-height: none !important;
    }
    .ub-banner .swiper-slide .cover {
        height: 0 !important;
        min-height: 0 !important;
        padding-bottom: 56% !important;
        position: relative;
    }
    .ub-banner .swiper-slide .cover:after {
        display: none !important;
        margin-top: 0 !important;
    }
    .ub-banner .swiper-slide .cover {
        background-size: cover !important;
        background-position: center !important;
    }
    /* 按 5:3 锁死，避免空白 */
    .ub-banner.ratio-5-3 .swiper-slide .cover,
    .ub-banner.m-ratio-5-3 .swiper-slide .cover {
        padding-bottom: 60% !important;
    }
    .ub-banner .swiper-pagination {
        bottom: 10px !important;
    }
}