/* Table of Contents styles */
.toc-pane {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.toc-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.toc-container,
.toc-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

/* Header layout — font/padding/weight come from .pane-section-header. */
.toc-header {
    justify-content: space-between;
}

.toc-depth-selector {
    font-size: 0.85rem;
    padding: 2px 6px;
    border-radius: 3px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
}

.toc-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
    font-size: 0.8rem;
}

.toc-item {
    padding: 0;
    margin: 0;
    line-height: 1.2;
}

/* TOC heading level styles */
.toc-level-1 > a {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.toc-level-2 > a {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.toc-level-3 > a {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.toc-level-4 > a {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.toc-level-5 > a,
.toc-level-6 > a {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Nested list spacing */
.toc-list ul {
    list-style: none;
    padding-left: 6px;
    margin: 0;
}

.toc-list li {
    margin-bottom: 1px;
    line-height: 1.2;
}

.toc-list li a {
    display: block;
    padding: 2px 6px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 3px;
    transition: background-color 0.15s ease;
}

.toc-list li a:hover {
    background-color: var(--bg-hover);
    color: var(--text);
}

/* Active TOC item highlighting */
.toc-list li.toc-active {
    background-color: var(--primary);
    border-radius: 3px;
}

/* Use high-specificity selectors to override per-level color rules */
.toc-list li.toc-active > a,
.toc-list li.toc-active > a:hover,
.toc-list li.toc-level-1.toc-active > a,
.toc-list li.toc-level-2.toc-active > a,
.toc-list li.toc-level-3.toc-active > a,
.toc-list li.toc-level-4.toc-active > a,
.toc-list li.toc-level-5.toc-active > a,
.toc-list li.toc-level-6.toc-active > a {
    color: var(--text-light);
    border-bottom-color: transparent;
    background-color: transparent;
}

.toc-list li.toc-level-1 {
    font-weight: 700;
    font-size: 1rem;
    padding-left: 0px;
}

.toc-list li.toc-level-1 a {
    color: var(--text);
    border-bottom: 1px solid var(--primary);
    padding-bottom: 2px;
}

/* Tree-style connecting lines for TOC hierarchy */
.toc-list li.toc-level-2 {
    font-weight: 650;
    font-size: 0.9rem;
    padding-left: 16px;
    position: relative;
}

.toc-list li.toc-level-2::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 50%;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 8px;
}

.toc-list li.toc-level-2 a {
    color: var(--text);
}

.toc-list li.toc-level-3 {
    font-weight: 600;
    font-size: 0.8rem;
    padding-left: 32px;
    position: relative;
}

.toc-list li.toc-level-3::before {
    content: '';
    position: absolute;
    left: 22px;
    top: 0;
    bottom: 50%;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 8px;
}

.toc-list li.toc-level-3 a {
    color: var(--text-muted);
}

.toc-list li.toc-level-4 {
    font-weight: 600;
    font-size: 0.75rem;
    padding-left: 48px;
    position: relative;
}

.toc-list li.toc-level-4::before {
    content: '';
    position: absolute;
    left: 38px;
    top: 0;
    bottom: 50%;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 8px;
}

.toc-list li.toc-level-4 a {
    color: var(--text-muted);
}

.toc-list li.toc-level-5 {
    font-weight: 600;
    font-size: 0.7rem;
    padding-left: 64px;
    font-style: italic;
    position: relative;
}

.toc-list li.toc-level-5::before {
    content: '';
    position: absolute;
    left: 54px;
    top: 0;
    bottom: 50%;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 8px;
}

.toc-list li.toc-level-5 a {
    color: var(--text-muted);
}

.toc-list li.toc-level-6 {
    font-weight: 600;
    font-size: 0.65rem;
    padding-left: 80px;
    font-style: italic;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
}

.toc-list li.toc-level-6::before {
    content: '';
    position: absolute;
    left: 70px;
    top: 0;
    bottom: 50%;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 8px;
}

.toc-list li.toc-level-6 a {
    color: var(--text-muted);
}

/* Vertical connecting lines */
.toc-list li:not(.toc-level-1)::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 50%;
    bottom: -2px;
    border-left: 1px solid var(--border);
    z-index: -1;
}

.toc-list li.toc-level-3::after {
    left: 22px;
}

.toc-list li.toc-level-4::after {
    left: 38px;
}

.toc-list li.toc-level-5::after {
    left: 54px;
}

.toc-list li.toc-level-6::after {
    left: 70px;
}