.post-toc-wrapper {
    background: #f8f9fa;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    margin: 25px 0;
    overflow: hidden;
}

.toc-header {
    padding: 0px 7px;
    background: #2c3e50;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.toc-title {
    font-weight: 600;
    margin: 0;
}

.toc-toggle {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.2em;
    cursor: pointer;
}

.toc-nav {
    padding: 10px 15px;
    background: white;
}

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

.toc-list {
    max-height: 1000px;
    transition: max-height 0.3s ease;
}

.toc-list.collapsed {
    max-height: 0;
}

.toc-item {
    padding: 8px 0;
}

.toc-item a {
    color: #34495e;
    text-decoration: none;
    display: block;
    transition: all 0.2s;
}

.toc-item a:hover {
    color: #3498db;
    padding-left: 5px;
}

.toc-sublist {
    padding-left: 15px;
    border-left: 1px dashed #eee;
}

.toc-level-3 a {
    color: #7f8c8d;
}

.toc-level-4 a {
    color: #bdc3c7;
}