.etoc{
    margin:24px 0;
    padding:16px 18px;
    border:1px solid #e5e7eb;
    border-radius:12px;
    background:#fff;
    box-shadow:0 2px 10px rgba(0,0,0,.04);
    font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}

.etoc-header{
    display:flex;
    align-items:center;
    justify-content:space-between;
}

.etoc-toggle{
    all:unset;
    display:flex;
    align-items:center;
    gap:10px;
    width:100%;
    cursor:pointer;
    color:#111827;
    font-weight:700;
    font-size:18px;
    line-height:1.3;
}

.etoc-icon{
    margin-left:auto;
    transition:transform .2s ease;
    color:#6b7280;
}

.etoc-body{
    margin-top:12px;
}

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

.etoc-item{
    margin:6px 0;
}

.etoc-list .etoc-list{
    margin-left:18px;
    padding-left:14px;
    border-left:1px solid #e5e7eb;
}

.etoc-link{
    color:#374151;
    text-decoration:none;
    font-size:15px;
    line-height:1.6;
}

.etoc-link:hover,
.etoc-link.is-active{
    color:#2563eb;
}

.etoc.is-collapsed .etoc-body{
    display:none;
}

.etoc.is-collapsed .etoc-icon{
    transform:rotate(-90deg);
}

@media (max-width: 768px){
    .etoc{
        padding:14px 16px;
    }
    .etoc-toggle{
        font-size:17px;
    }
    .etoc-link{
        font-size:14px;
    }
}