.navbar-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 15px;
}

.header-content {
    display: flex;
    align-items: center;
    flex-grow: 1;
    justify-content: space-between;
    margin: 0 15px;
}

.site-brand {
    flex-shrink: 0;
}

.category-nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.category-btn {
    color: #333; /* Dark gray color for better visibility */
    background-color: #f0f0f0; /* Light gray background */
    padding: 5px 10px;
    margin-left: 10px;
    font-size: 14px;
    text-transform: uppercase;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

    .category-btn:hover {
        background-color: #e0e0e0; /* Slightly darker on hover */
    }

@media (max-width: 768px) {
    .category-nav {
        display: none;
    }
}


.side-nav-panel-left li a {
    padding: 0 15px;
    height: 50px;
    line-height: 50px;
}

.side-nav-panel-left .category-item {
    padding: 5px 0;
}

    .side-nav-panel-left .category-item a {
        color: #333 !important;
        background-color: #f0f0f0;
        margin: 0 15px;
        border-radius: 4px;
        transition: background-color 0.3s ease;
        height: 40px;
        line-height: 40px;
    }

        .side-nav-panel-left .category-item a:hover {
            background-color: #e0e0e0;
        }

        .side-nav-panel-left li a i,
        .side-nav-panel-left .category-item a i {
            line-height: inherit;
            height: inherit;
            width: 2rem;
            font-size: 1.6rem;
            display: inline-block;
            text-align: center;
            margin-right: 1rem;
        }

/* 確保其他菜單項目的樣式保持不變 */
.side-nav-panel-left li:not(.category-item) a {
    color: initial;
    background-color: transparent;
}

    .side-nav-panel-left li:not(.category-item) a:hover {
        background-color: rgba(0,0,0,0.05);
    }