.forum-section {
    padding: 5rem 0;
    background: rgba(0, 0, 0, 0.9);
}

.post-form {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.post-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 8px;
    color: #fff;
}

.post-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.post-author {
    font-weight: bold;
    color: #4a9eff;
}

.post-date {
    color: #888;
    font-size: 0.9em;
}
.summary-text {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    /*! autoprefixer: ignore next */
    -webkit-box-orient: vertical;
    overflow: hidden;
    height: 4.5em;
    margin-bottom: 0.5rem;
}

.category-nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch; /* 為 iOS 提供平滑滾動 */
}

.category-nav::-webkit-scrollbar {
    display: none; /* 隱藏滾動條 */
}

.category-nav .nav {
    flex-wrap: nowrap;
    white-space: nowrap;
    padding: 0.5rem;
}

.category-nav .nav-item {
    margin: 0 0.25rem;
}

.category-nav .nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* 手機版特別樣式 */
@media (max-width: 768px) {
    .category-nav .nav-link {
        padding: 0.35rem 0.75rem;
        font-size: 0.85rem;
    }
    
    .category-nav .container {
        padding: 0 15px; /* 添加左右內邊距 */
    }
    
    .category-nav .nav {
        padding: 0.25rem 0.5rem; /* 增加左右內邊距 */
    }

    /* 為第一個和最後一個導航項添加額外間距 */
    .category-nav .nav-item:first-child {
        margin-left: 0.5rem;
    }

    .category-nav .nav-item:last-child {
        margin-right: 0.5rem;
    }
}