/* =========================================================================
   LAVUMALL 架站-17｜主分類列自動換行與內容區寬度對齊
   與全站 .container 相同的 1200px 外框，分類整組由左至右排滿再換行。
   使用 #mainHeader 限定範圍，不影響其他頁面的 nav 與子分類下拉選單。
   ========================================================================= */
#mainHeader .header-nav-row {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    box-sizing: border-box;
}

#mainHeader #mainNav {
    display: flex;
    width: 100%;
    min-width: 0;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: center;
    column-gap: 20px;
    row-gap: 8px;
}

/* 每個主分類保持為一個獨立項目，不拆散文字與下拉箭頭。 */
#mainHeader #mainNav > .nav-item-wrapper,
#mainHeader #mainNav > .nav-cat-btn {
    flex: 0 0 auto;
    max-width: 100%;
}

/* 超長單一名稱在極窄視窗內仍可自行折行，不造成水平溢出。 */
#mainHeader #mainNav .nav-item-wrapper > .nav-cat-btn,
#mainHeader #mainNav > .nav-cat-btn {
    max-width: 100%;
    text-align: left;
}

#mainHeader #mainNav .nav-cat-btn > span {
    min-width: 0;
    overflow-wrap: anywhere;
}

@media (max-width: 992px) {
    #mainHeader #mainNav {
        column-gap: 10px;
        row-gap: 8px;
    }
}


/* Mobile/tablet main-category fold. Desktop retains the original full navigation. */
#mainHeader .header-category-list-viewport { position: relative; width: 100%; }
#mainHeader .header-category-expand { display: none; }

@media (max-width: 992px) {
    #mainHeader .header-category-list-viewport.is-collapsible:not(.is-expanded) {
        max-height: 88px;
        overflow: hidden;
    }
    #mainHeader .header-category-list-viewport.is-collapsible:not(.is-expanded)::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 38px;
        background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #fff 94%);
        pointer-events: none;
        z-index: 2;
    }
    #mainHeader .header-category-list-viewport.is-expanded {
        max-height: none;
        overflow: visible;
    }
    #mainHeader .header-category-expand:not([hidden]) {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 9px;
        width: 100%;
        margin: 5px auto 0;
        padding: 10px 14px;
        border: 1px solid #e5e5ea;
        border-radius: 12px;
        background: #fff;
        color: #0071e3;
        font-family: inherit;
        font-size: 13px;
        font-weight: 600;
        line-height: 1.4;
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
    }
    #mainHeader .header-category-expand .fa-chevron-down {
        font-size: 12px;
        transition: transform .2s ease;
    }
    #mainHeader .header-category-expand[aria-expanded="true"] .fa-chevron-down {
        transform: rotate(180deg);
    }
    #mainHeader .header-category-expand:focus-visible {
        outline: 2px solid #0071e3;
        outline-offset: 2px;
    }
}