/* ============================================================
   CST 2026 — 顶部导航（一级「产品」 + 四大类 + 产品分组）
   v3：修复鼠标移动中断（面板上方 10px 透明桥接区）
   ============================================================ */

.cst-masthead__inner { position: relative; }   /* 面板的定位基准：整个内容区 */

.cst-nav > ul { position: static; }

/* 特异性要压过 cst-core.css 的 .cst-nav > ul > li{position:relative} */
.cst-nav > ul > li.cst-mega-item-root { position: static; list-style: none; }

.cst-mega-trigger {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}

.cst-mega-caret {
    font-size: 9px;
    opacity: .55;
    transition: transform .2s ease, opacity .2s ease;
}

.cst-mega-item-root:hover .cst-mega-caret,
.cst-mega-item-root.is-open .cst-mega-caret {
    transform: rotate(180deg);
    opacity: 1;
}

/* ---------- 外层：透明命中层（关键：无缝隙） ---------- */
.cst-mega-panel {
    position: absolute;
    top: 100%;
    left: 15px;
    width: calc(100% - 30px);
    max-width: 1320px;
    padding-top: 10px;
    background: transparent;
    border: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .16s ease, visibility .16s ease;
    z-index: 900;
}

.cst-mega-item-root:hover > .cst-mega-panel,
.cst-mega-item-root:focus-within > .cst-mega-panel,
.cst-mega-item-root.is-open > .cst-mega-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* ---------- 内层：真正的白色卡片 ---------- */
.cst-mega-body {
    background: #fff;
    border: 1px solid #e6edf7;
    border-radius: 14px;
    box-shadow: 0 18px 44px rgba(15, 47, 92, .14);
    overflow: hidden;
}

.cst-mega-panel__inner {
    display: flex;
    align-items: stretch;
    min-height: 220px;
}

/* ---------- 左列：四个大类 ---------- */
.cst-mega-tabs {
    flex: 0 0 204px;
    padding: 16px 10px;
    background: #f7faff;
    border-right: 1px solid #eef3fa;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.cst-mega-tab {
    display: block;
    width: 100%;
    padding: 12px 16px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: #33415c;
    font-size: 15px;
    font-weight: 400;
    line-height: 1.4;
    text-align: left;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease;
}

.cst-mega-tab:hover { background: #eaf1ff; }

.cst-mega-tab.is-active {
    background: #fff;
    color: #0066ff;
    font-weight: 500;
    box-shadow: 0 1px 4px rgba(15, 47, 92, .08);
}

/* ---------- 右区：产品分组 ---------- */
.cst-mega-panes {
    flex: 1 1 auto;
    min-width: 0;
    padding: 20px 26px;
}

.cst-mega-pane { display: none; }
.cst-mega-pane.is-active {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    column-gap: 26px;
    align-content: start;
}

.cst-mega-pane__title {
    grid-column: 1 / -1;
    font-size: 12px;
    font-weight: 500;
    color: #8b98ad;
    letter-spacing: .04em;
    margin: 2px 0 14px;
}

.cst-mega-link {
    position: relative;
    display: block;
    padding: 12px 34px 12px 12px;
    margin: 0 -12px;
    border-radius: 8px;
    text-decoration: none !important;
    transition: background-color .15s ease;
}

.cst-mega-link:hover { background: #f4f8ff; }

.cst-mega-link__name {
    font-size: 15px;
    font-weight: 400;
    color: #0d1526;
    line-height: 1.45;
}

.cst-mega-link__arrow {
    position: absolute;
    right: 14px;
    top: 16px;
    font-size: 11px;
    color: #c2ccdb;
    opacity: 0;
    transition: opacity .15s ease, transform .15s ease;
}

.cst-mega-link:hover .cst-mega-link__arrow { opacity: 1; transform: translateX(2px); }

.cst-mega-link.is-muted { cursor: default; }
.cst-mega-link.is-muted .cst-mega-link__name { color: #9aa6b8; }
.cst-mega-link.is-muted:hover { background: transparent; }

.cst-mega-empty { font-size: 13px; color: #9aa6b8; padding: 8px 0; }

.cst-mega-panel__foot {
    padding: 14px 26px;
    background: #f7faff;
    border-top: 1px solid #eef3fa;
    font-size: 12px;
    color: #6b7c96;
}

/* ---------- 移动端 ---------- */
@media (max-width: 991.98px) {
    .cst-mega-panel {
        position: static;
        width: auto;
        padding-top: 0;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        display: none;
        margin: 6px 0 4px;
    }

    .cst-mega-item-root.is-open > .cst-mega-panel { display: block; }

    .cst-mega-body {
        border: 0;
        border-radius: 10px;
        box-shadow: none;
        background: #f7faff;
    }

    .cst-mega-panel__inner { display: block; min-height: 0; }

    .cst-mega-tabs {
        flex: none;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
        padding: 10px 12px;
        background: transparent;
        border-right: 0;
    }

    .cst-mega-tab {
        width: auto;
        padding: 6px 12px;
        border-radius: 20px;
        background: #fff;
        font-size: 13px;
    }

    .cst-mega-tab.is-active { background: #0066ff; color: #fff; box-shadow: none; }

    .cst-mega-panes { padding: 4px 12px 12px; }

    .cst-mega-pane__title { display: none; }

    .cst-mega-panel__foot { display: none; }
}

/* ---------- 菜单后的常规入口 ---------- */
.cst-nav > ul > .cst-nav-plain > a {
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
}

/* ---------- 下拉菜单：纯文字行，去掉“按钮”观感 ---------- */
.cst-nav .dropdown-menu > li.dropdown-item {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin: 0 !important;
}

.cst-nav .dropdown-menu > li.dropdown-item > a.dropdown-item,
.cst-nav .dropdown-menu > li > a.dropdown-item {
    display: block !important;
    width: 100%;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 6px !important;
    padding: 9px 12px !important;
    font-size: 14px;
    font-weight: 400;
    color: #33415c !important;
    white-space: normal;
}

.cst-nav .dropdown-menu > li.dropdown-item > a.dropdown-item:hover,
.cst-nav .dropdown-menu > li > a.dropdown-item:hover,
.cst-nav .dropdown-menu > li > a.dropdown-item:focus {
    background: #f4f8ff !important;
    color: #0066ff !important;
}

/* 顶级项：保持原版下划线 ---------- */
.cst-nav > ul > li > a::before {
    content: "";
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 0;
    height: 2px;
    background: #0066ff;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform .25s ease;
}

.cst-nav > ul > li > a:hover::before,
.cst-nav > ul > li.active > a::before,
.cst-nav > ul > li.show > a::before {
    transform: scaleX(1);
}

.cst-nav > ul > li > a { position: relative; }

/* ---------- 下拉分隔线：细一点、短一点，不再占满整行 ---------- */
.cst-nav .dropdown-menu .dropdown-divider,
.cst-topnav .dropdown-menu .dropdown-divider,
.dropdown-menu-right .dropdown-divider {
    height: 0;
    margin: 7px 14px;
    border: 0;
    border-top: 1px solid #e6eef8;
    background: transparent;
    overflow: hidden;
}

/* 顶部次级菜单（您好，XX）的下拉：与主导航保持同一套纯文字行 */
.cst-topnav .dropdown-menu {
    min-width: 208px;
    padding: 6px;
    border: 1px solid var(--cst-line);
    border-radius: 8px;
    box-shadow: var(--cst-shadow);
}

.cst-topnav .dropdown-menu > li {
    padding: 0;
    margin: 0;
    display: block;
}

.cst-topnav .dropdown-menu > li > a {
    display: block;
    padding: 9px 12px !important;
    border: 0 !important;
    border-radius: 6px;
    background: transparent;
    font-size: 14px;
    font-weight: 400;
    color: var(--cst-text) !important;
    text-decoration: none;
    white-space: normal;
}

.cst-topnav .dropdown-menu > li > a:hover {
    background: var(--cst-brand-50);
    color: var(--cst-brand) !important;
}

/* ---------- 导航项不换行（未登录时菜单项多，之前被挤成两行） ---------- */
.cst-nav > ul > li > a {
    white-space: nowrap !important;
    padding: 0 10px !important;
}

.cst-nav > ul > li > a::before {
    left: 10px;
    right: 10px;
}

/* 导航项不参与 flex 压缩，溢出交给 JS 折叠到「更多」 */
.cst-nav > ul > li { flex: 0 0 auto; }
.cst-brand { flex: 0 0 auto; }

/* 「更多」下拉里的项保持同一套文字行样式 */
.cst-nav .collapsable-dropdown-menu > li > a {
    display: block;
    padding: 9px 12px !important;
    border-radius: 6px;
    font-size: 14px;
    color: var(--cst-text) !important;
    white-space: nowrap;
}

.cst-nav .collapsable-dropdown-menu > li > a:hover {
    background: var(--cst-brand-50);
    color: var(--cst-brand) !important;
}


/* ---------- 产品定位描述 ---------- */
.cst-mega-link__desc {
    display: block;
    margin-top: 4px;
    font-size: 12.5px;
    line-height: 1.5;
    color: #8b98ad;
    font-weight: 400;
}

.cst-mega-link:hover .cst-mega-link__desc {
    color: #6b7c96;
}

.cst-mega-link.is-muted .cst-mega-link__desc {
    color: #b3bdcb;
}

/* 面板变窄时降列，避免描述折成三行 */
@media (max-width: 1199.98px) {
    .cst-mega-pane.is-active {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 991.98px) {
    .cst-mega-pane.is-active {
        grid-template-columns: minmax(0, 1fr);
    }
}