.toc-sidebar {
    position: fixed;
    left: 32px;
    top: 118px;
    max-height: 76vh;
    overflow: auto;
    width: 250px;
    z-index: 15;
    font-family: 'Hanken Grotesk', 'Poppins', sans-serif;
    font-size: 15.5px;
    line-height: 1.55;
}

.toc-sidebar .toc-title {
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #999;
    margin-bottom: 14px;
    font-weight: 700;
}

.toc-sidebar ul {
    list-style: none;
    margin: 0;
    padding: 0 0 0 16px;
    border-left: 2px solid #e2e2e2;
}

.toc-sidebar li {
    margin: 0;
    padding: 5px 0;
}

.toc-sidebar a {
    color: #888;
    text-decoration: none;
    display: block;
    transition: color 0.15s ease;
}

.toc-sidebar a:hover {
    color: #333;
}

.toc-sidebar a.toc-active {
    color: #111;
    font-weight: 600;
}

.toc-sidebar .toc-h3 {
    padding-left: 14px;
    font-size: 0.92em;
}

/* Dark mode */
body.dark-mode .toc-sidebar ul {
    border-left-color: #333;
}

body.dark-mode .toc-sidebar .toc-title {
    color: #777;
}

body.dark-mode .toc-sidebar a {
    color: #888;
}

body.dark-mode .toc-sidebar a:hover {
    color: #ddd;
}

body.dark-mode .toc-sidebar a.toc-active {
    color: #fff;
    font-weight: 600;
}

@media (max-width: 1100px) {
    .toc-sidebar {
        display: none !important;
    }
}