/* ========================================
   分類頁樣式 - category.css
   ======================================== */

/* ---------- 麵包屑導航 ---------- */
.category-breadcrumb {
    background-color: var(--bg-secondary);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.category-breadcrumb .breadcrumb {
    font-size: 0.875rem;
}

.category-breadcrumb .breadcrumb-item a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.category-breadcrumb .breadcrumb-item a:hover {
    color: var(--primary-color);
}

.category-breadcrumb .breadcrumb-item.active {
    color: var(--text-color);
}

/* ---------- 上方廣告區 ---------- */
.category-top-ads {
    padding: 1rem 0;
    background-color: var(--bg-primary);
}

.top-ads-container {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.top-ads-container .ad-item {
    max-width: 100%;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.top-ads-container .ad-item img {
    display: block;
    max-width: 100%;
    height: auto;
}

/* ---------- 主要內容區 ---------- */
.category-main {
    padding: 1.5rem 0 3rem;
    min-height: 60vh;
}

/* ---------- 漂浮側邊廣告區 ---------- */
.floating-sidebar {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    width: 160px;
}

.floating-sidebar-left {
    left: 10px;
}

.floating-sidebar-right {
    right: 10px;
}

.sidebar-ads-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 側邊廣告卡片樣式 (160 x 720) */
.sidebar-ads-container .ad-card {
    width: 160px;
    height: 720px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.sidebar-ads-container .ad-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.sidebar-ads-container .ad-card a {
    display: flex;
    flex-direction: column;
    height: 100%;
    text-decoration: none;
    color: inherit;
}

/* 廣告卡片圖片區 */
.sidebar-ads-container .ad-card-image {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary, #f8f9fa);
    overflow: hidden;
}

.sidebar-ads-container .ad-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.sidebar-ads-container .ad-card:hover .ad-card-image img {
    transform: scale(1.05);
}

/* 廣告卡片內容區 */
.sidebar-ads-container .ad-card-body {
    padding: 0.75rem;
    /* 背景色由 inline style 控制 (overlay_opacity) */
}

.sidebar-ads-container .ad-card-title {
    font-size: 0.875rem;
    font-weight: 600;
    /* 顏色由 inline style 控制 (text_color) */
    margin: 0 0 0.25rem 0;
    line-height: 1.3;
    /* 自適應寬度，最多 3 行 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.sidebar-ads-container .ad-card-subtitle {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    line-height: 1.4;
    /* 允許 HTML，最多 4 行 */
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.sidebar-ads-container .ad-card-subtitle a {
    color: var(--primary-color);
    display: inline;
}

/* 舊版相容：純圖片廣告 */
.sidebar-ads-container .ad-item {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.sidebar-ads-container .ad-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.sidebar-ads-container .ad-item img {
    display: block;
    width: 100%;
    height: auto;
}

.sidebar-ads-container .ad-item a {
    display: block;
}

/* ---------- 分類標題區 ---------- */
.category-header {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 1rem;
}

.category-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-title i {
    color: var(--primary-color);
}

.category-description {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.category-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* ---------- 分類文章 ---------- */
.category-article {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    line-height: 1.8;
    font-size: 0.95rem;
    color: var(--text-color);
}

.category-article h2,
.category-article h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.category-article h3:first-child {
    margin-top: 0;
}

.category-article p {
    margin-bottom: 0.75rem;
}

.category-article img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 0.5rem 0;
}

.category-article ul,
.category-article ol {
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
}

.category-article a {
    color: var(--primary-color);
}

/* ---------- 文章內聯編輯 (管理者) ---------- */
.article-edit-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
}

.article-lang-preview {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.article-lang-btn {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.article-lang-btn:hover {
    border-color: var(--primary-color);
    color: var(--text-color);
}

.article-lang-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.article-lang-btn .fi {
    font-size: 0.85em;
}

.article-edit-btn {
    font-size: 0.8rem;
    opacity: 0.6;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.article-edit-btn:hover {
    opacity: 1;
}

.category-article.editing {
    padding: 0;
    background: none;
    border: none;
}

.article-edit-wrapper {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--bg-secondary);
}

.article-edit-tabs {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.article-tab {
    padding: 0.5rem 1rem;
    border: none;
    background: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.article-tab:hover {
    color: var(--text-color);
}

.article-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.article-edit-lang-indicator {
    margin-left: auto;
    padding: 0 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-edit-body {
    position: relative;
}

.article-edit-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: none;
    outline: none;
    resize: none;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-secondary);
    tab-size: 4;
}

.article-edit-textarea:focus {
    box-shadow: inset 0 0 0 1px var(--primary-color);
}

.article-edit-preview {
    padding: 1rem;
    min-height: 200px;
    overflow-y: auto;
}

/* --- 下方區塊：翻譯 + 操作按鈕 --- */
.article-edit-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.article-translate-section {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.article-translate-header {
    display: flex;
    align-items: center;
}

.article-translate-toggle {
    font-size: 0.8rem;
}

.article-translate-toggle .toggle-arrow {
    font-size: 0.7em;
    transition: transform 0.2s;
}

.article-translate-panel {
    padding-top: 0.5rem;
}

.article-translate-langs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem 0.75rem;
    padding: 0.4rem 0;
}

.article-translate-select-all,
.article-translate-lang {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
    color: var(--text-color);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.article-translate-select-all {
    font-weight: 600;
}

.article-translate-divider {
    width: 1px;
    height: 16px;
    background: var(--border-color);
}

.article-translate-lang .fi {
    font-size: 0.9em;
}

.article-translate-lang input[type="checkbox"],
.article-translate-select-all input[type="checkbox"] {
    accent-color: var(--primary-color);
}

.article-translate-progress {
    padding: 0.4rem 0;
}

.article-translate-status {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
}

.article-edit-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
}

/* ---------- 產品網格 ---------- */
.products-grid {
    min-height: 300px;
}

/* ---------- 產品卡片 ---------- */
.product-card {
    position: relative;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-color: var(--primary-color);
}

/* 訂製品：黃色發光粗邊框 */
.product-card.is-custom {
    border-color: #f5b50a;
    box-shadow: 0 0 0 2px #f5b50a, 0 0 12px rgba(245, 181, 10, 0.55);
}

.product-card.is-custom:hover {
    border-color: #f5b50a;
    box-shadow: 0 0 0 2px #f5b50a, 0 0 18px rgba(245, 181, 10, 0.85), 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* 主打商品：左上角熱銷 ribbon */
.product-card .hot-badge {
    position: absolute;
    top: 10px;
    left: -32px;
    z-index: 3;
    transform: rotate(-45deg);
    width: 120px;
    padding: 4px 0;
    background: linear-gradient(135deg, #e53935, #c62828);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.product-card a {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* 產品圖片 */
.product-image {
    width: 100%;
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary, #f8f9fa);
    padding: 1rem;
    overflow: hidden;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

/* 無圖片佔位 */
.product-image .no-image {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    color: var(--text-muted);
}

.product-image .no-image i {
    font-size: 2.5rem;
}

/* 產品資訊 */
.product-info {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.product-name {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    order: 1;
    text-align: center;
}

.product-model {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
    line-height: 1.3;
    order: 2;
    text-align: center;
}

.product-price {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--success-color, #198754);
    margin: 0;
    margin-top: auto;
    order: 3;
    text-align: center;
}

/* 停產：紅底白字 */
.product-price.discontinued {
    display: inline-block;
    align-self: center;
    padding: 0.2rem 0.75rem;
    border-radius: 4px;
    background-color: #c62828;
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* 詢價：使用主色，與一般價格區分 */
.product-price.inquiry {
    color: var(--primary-color);
    font-style: italic;
}

/* ---------- Placeholder 卡片 ---------- */
.placeholder-card {
    pointer-events: none;
}

.placeholder-card .product-image {
    background-color: var(--bg-tertiary, #e9ecef);
}

.placeholder-card .product-info .placeholder {
    background-color: var(--bg-tertiary, #dee2e6);
}

/* ---------- 無產品提示 ---------- */
.no-products {
    padding: 4rem 1rem;
}

.no-products i {
    opacity: 0.5;
}

/* ---------- 錯誤提示 ---------- */
.load-error {
    padding: 4rem 1rem;
}

/* ---------- 分頁 ---------- */
.pagination-nav {
    margin-top: 2rem;
}

.pagination {
    gap: 0.25rem;
}

.pagination .page-item .page-link {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background-color: var(--bg-secondary);
    padding: 0.5rem 0.875rem;
    transition: all 0.2s ease;
}

.pagination .page-item .page-link:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.pagination .page-item.disabled .page-link {
    background-color: var(--bg-tertiary, #e9ecef);
    border-color: var(--border-color);
    color: var(--text-muted);
    opacity: 0.6;
}

/* ---------- 響應式佈局 ---------- */

/*
 * 漂浮廣告顯示邏輯：
 * - 廣告寬度：160px x 2 = 320px
 * - 廣告間距：20px x 2 = 40px
 * - Container 最大寬度：1140px (Bootstrap xl)
 * - 總需求寬度：160 + 20 + 1140 + 20 + 160 = 1500px
 * - 當螢幕寬度 < 1500px 時隱藏漂浮廣告
 */

/* 隱藏漂浮廣告（螢幕寬度不足時） */
@media (max-width: 1499.98px) {
    .floating-sidebar {
        display: none !important;
    }
}

/* 響應式：lg (≥992px) - 4 欄產品 */
@media (min-width: 992px) {
    .products-grid .col-xl-3 {
        flex: 0 0 auto;
        width: 25%;
    }
}

/* 響應式：md (≥768px, <992px) - 2 欄產品 */
@media (min-width: 768px) and (max-width: 991.98px) {
    .products-grid .col-md-6 {
        flex: 0 0 auto;
        width: 50%;
    }
}

/* 響應式：sm (<768px) - 1 欄產品，左右佈局 */
@media (max-width: 767.98px) {
    .products-grid .col-12 {
        flex: 0 0 auto;
        width: 100%;
    }

    .category-title {
        font-size: 1.5rem;
    }

    .category-breadcrumb {
        padding: 0.5rem 0;
    }

    .category-breadcrumb .breadcrumb {
        font-size: 0.8rem;
    }

    /* 卡片左右佈局：圖片在左，資訊在右 */
    .product-card {
        flex-direction: row;
    }

    .product-card a {
        flex-direction: row;
    }

    .product-image {
        width: 120px;
        height: 120px;
        flex-shrink: 0;
    }

    /* 右側資訊區：上-名稱、中-型號、下-價格 */
    .product-info {
        justify-content: flex-start;
        padding: 0.75rem;
    }

    .product-name {
        order: 1;
        font-size: 0.8rem;
        -webkit-line-clamp: 2;
    }

    .product-model {
        order: 2;
        font-size: 0.95rem;
    }

    .product-price {
        order: 3;
        margin-top: auto;
    }
}

/* ---------- 深色模式 ---------- */
[data-theme="dark"] .category-breadcrumb {
    background-color: var(--bg-secondary);
}

[data-theme="dark"] .product-card {
    background-color: var(--bg-secondary);
}

[data-theme="dark"] .product-image {
    background-color: var(--bg-tertiary, #2d2d2d);
}

[data-theme="dark"] .placeholder-card .product-image {
    background-color: var(--bg-tertiary, #3d3d3d);
}

[data-theme="dark"] .sidebar-ads-container .ad-item {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .sidebar-ads-container .ad-card {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .sidebar-ads-container .ad-card-image {
    background-color: var(--bg-tertiary, #2d2d2d);
}

/* ad-card-body 背景由 inline style 控制，不需要覆蓋 */

[data-theme="dark"] .top-ads-container .ad-item {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ========================================
   排序選單樣式
   ======================================== */

.category-sort-wrapper {
    width: 100%;
}

.category-sort-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-sort-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
    display: flex;
    align-items: center;
}

.category-sort-label i {
    color: var(--primary-color);
}

.category-sort-select {
    font-size: 0.875rem;
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border-radius: 6px;
    background-color: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-sort-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(195, 13, 35, 0.15);
}

[data-theme="dark"] .category-sort-select:focus {
    box-shadow: 0 0 0 0.2rem rgba(212, 175, 55, 0.15);
}

[data-theme="dark"] .category-sort-card {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .category-sort-select {
    background-color: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

/* 手機版：排序選單橫向顯示 */
@media (max-width: 991.98px) {
    .category-sort-card {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .category-sort-select {
        flex: 1;
        max-width: 200px;
    }
}

/* ========================================
   分類樹元件樣式
   ======================================== */

/* ---------- 分類樹容器 ---------- */
.category-tree-wrapper {
    width: 100%;
}

/* ---------- 桌面版分類樹卡片 ---------- */
.category-tree-desktop {
    display: block;
}

.category-tree-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.2s ease;
}

.category-tree-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.category-tree-header {
    background-color: var(--bg-tertiary);
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.category-tree-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.category-tree-title i {
    color: var(--primary-color);
}

.category-tree-body {
    padding: 0.75rem 0;
    max-height: 70vh;
    overflow-y: auto;
}

/* 自訂滾動條 */
.category-tree-body::-webkit-scrollbar {
    width: 6px;
}

.category-tree-body::-webkit-scrollbar-track {
    background: transparent;
}

.category-tree-body::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.category-tree-body::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* ---------- 分類樹列表 ---------- */
.category-tree-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-tree-item {
    position: relative;
}

.category-tree-link {
    display: flex;
    align-items: center;
    padding: 0.625rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    gap: 0.5rem;
}

.category-tree-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

.category-tree-link.active {
    background-color: var(--primary-color);
    color: var(--text-inverse);
}

.category-tree-link.active:hover {
    background-color: var(--primary-hover);
}

.category-tree-link i.category-icon {
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.category-tree-link .category-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---------- 塌縮展開控制 ---------- */
.category-tree-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    margin-left: auto;
    background: none;
    border: none;
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.category-tree-toggle:hover {
    background-color: var(--bg-primary);
    color: var(--primary-color);
}

.category-tree-toggle i {
    transition: transform 0.2s ease;
    font-size: 0.875rem;
}

.category-tree-item.expanded > .category-tree-link .category-tree-toggle i {
    transform: rotate(90deg);
}

/* active 狀態下的 toggle 按鈕 */
.category-tree-link.active .category-tree-toggle {
    color: var(--text-inverse);
}

.category-tree-link.active .category-tree-toggle:hover {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--text-inverse);
}

/* ---------- 子分類列表 ---------- */
.category-tree-children {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: var(--bg-primary);
}

.category-tree-item.expanded > .category-tree-children {
    max-height: 500px;
}

.category-tree-children .category-tree-link {
    padding-left: 2.75rem;
    font-size: 0.85rem;
}

.category-tree-children .category-tree-link::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: var(--border-color);
}

/* 子項目的子列表（三層） */
.category-tree-children .category-tree-children .category-tree-link {
    padding-left: 4rem;
}

.category-tree-children .category-tree-children .category-tree-link::before {
    left: 2.5rem;
}

/* ---------- 載入中骨架屏 ---------- */
.category-tree-loading {
    padding: 0.75rem 1.25rem;
}

.category-tree-loading .placeholder {
    height: 20px;
    border-radius: 4px;
}

/* ---------- 手機版展開按鈕 ---------- */
.category-tree-mobile {
    display: none;
}

.category-tree-toggle-btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.875rem 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    gap: 0.75rem;
}

.category-tree-toggle-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tree-toggle-btn i:first-child {
    font-size: 1.25rem;
    color: var(--primary-color);
}

.category-tree-toggle-btn span {
    font-weight: 500;
}

/* ---------- 手機版全屏面板 ---------- */
.category-tree-panel {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--bg-primary);
    z-index: 1060;
    transition: left 0.3s ease;
    display: flex;
    flex-direction: column;
}

.category-tree-panel.open {
    left: 0;
}

.category-tree-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    min-height: 60px;
}

.category-tree-panel-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.95rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: opacity 0.2s ease;
}

.category-tree-panel-back:hover {
    opacity: 0.8;
}

.category-tree-panel-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.category-tree-panel-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.2s ease;
}

.category-tree-panel-close:hover {
    color: var(--text-primary);
}

.category-tree-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

/* 手機版分類列表 */
.category-tree-panel-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-tree-panel-item {
    border-bottom: 1px solid var(--border-color);
}

.category-tree-panel-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.2s ease;
    gap: 0.75rem;
}

.category-tree-panel-link:hover {
    background-color: var(--bg-tertiary);
}

.category-tree-panel-link.active {
    background-color: var(--primary-color);
    color: var(--text-inverse);
}

.category-tree-panel-link i.category-icon {
    width: 24px;
    text-align: center;
    font-size: 1.1rem;
}

.category-tree-panel-link .category-name {
    flex: 1;
}

.category-tree-panel-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    padding: 1rem 0;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.category-tree-panel-arrow:hover {
    color: var(--primary-color);
    background-color: var(--bg-tertiary);
}

/* 手機版子分類視圖 */
.category-tree-panel-subview {
    position: absolute;
    top: 0;
    left: 100%;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    transition: left 0.3s ease;
    display: flex;
    flex-direction: column;
}

.category-tree-panel-subview.active {
    left: 0;
}

/* ---------- 遮罩層 ---------- */
.category-tree-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1055;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.category-tree-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* ---------- 響應式設計 ---------- */

/* 螢幕寬度 < 992px：隱藏桌面版，顯示手機版按鈕 */
@media (max-width: 991.98px) {
    .category-tree-desktop {
        display: none;
    }

    .category-tree-mobile {
        display: block;
    }
}

/* 螢幕寬度 >= 992px：隱藏手機版 */
@media (min-width: 992px) {
    .category-tree-panel,
    .category-tree-overlay {
        display: none !important;
    }
}

/* ---------- 深色模式 ---------- */
[data-theme="dark"] .category-tree-card {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .category-tree-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .category-tree-header {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .category-tree-children {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .category-tree-toggle-btn {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .category-tree-panel {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .category-tree-panel-header {
    background-color: var(--bg-secondary);
}