body {
    scroll-behavior: smooth;
}

/* =========================
    SIDEBAR
========================= */
#sidebar {
    width: 280px;
    transition: all 0.3s ease;
    overflow: hidden;
    border-right: 1px solid #ddd;
}

    #sidebar.collapsed {
        width: 60px;
    }

        /* Hide TOC content when collapsed */
        #sidebar.collapsed .toc-content {
            opacity: 0;
            pointer-events: none;
        }

/* Content expands automatically */
#content {
    transition: all 0.3s ease;
}

/* TOC container */
.toc {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

/* Active TOC item */
.nav-link.active {
    font-weight: 600;
    color: #0d6efd !important;
}

/* Chapters */
.chapter {
    padding-top: 70px;
    margin-top: -70px;
}

/* =========================
    TOGGLE BUTTON (ARROWS)
========================= */
#toggleSidebar {
    position: absolute;
    top: 10px;
    right: 10px;
    border: none;
    background: transparent;
    font-size: 20px;
    cursor: pointer;
}

/* Rotate arrow effect */
#sidebar.collapsed #arrowIcon {
    transform: rotate(180deg);
    display: inline-block;
}

/* Highlight search */
mark.search-hit {
    background: yellow;
    padding: 0;
}