.article-sidebar {
    height: fit-content;
}

.article-toc {
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.article-toc-title {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.article-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.article-toc-list li {
    margin-bottom: 10px;
}

.article-toc-list a {
    color: #aaa;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
    display: block;
    padding: 4px 0;
}

.article-toc-list a:hover {
    color: #667eea;
}

.article-toc-list a.active {
    color: #667eea;
    font-weight: 600;
    position: relative;
}

.article-toc-list a.active::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: #667eea;
    border-radius: 2px;
}

.article-toc-list .toc-h3 {
    padding-left: 16px;
    font-size: 13px;
}