/*
 * TOC Collapsible Component
 * Thin style for in-document navigation
 * Minimal design that fits within content flow
 */

.toc-collapsible {
    background: transparent;
    border: none;
    border-left: 2px solid var(--theme-border);
    padding-left: 1rem;
}

.toc-collapsible-header {
    padding: 0.5rem 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-speed);
    border-bottom: 1px solid transparent;
}

.toc-collapsible-header:hover {
    border-bottom-color: var(--theme-border);
}

.toc-collapsible-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--theme-text-secondary);
    margin: 0;
}

.toc-collapsible-icon {
    font-size: 0.75rem;
    color: var(--theme-text-secondary);
    transition: transform var(--transition-speed);
}

.toc-collapsible.is-open .toc-collapsible-icon {
    transform: rotate(180deg);
}

.toc-collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.toc-collapsible.is-open .toc-collapsible-content {
    max-height: 500px;
}

.toc-list {
    list-style: none;
    padding: 0.5rem 0 0 0;
    margin: 0;
}

.toc-list-item {
    margin-bottom: 0.25rem;
}

.toc-list-item:last-child {
    margin-bottom: 0;
}

.toc-list-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--theme-text-primary);
    text-decoration: none;
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    transition: all var(--transition-speed);
}

.toc-list-link::before {
    content: "•";
    color: var(--theme-text-secondary);
    opacity: 0.6;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.toc-list-link:hover {
    background: var(--theme-bg);
    padding-left: 0.75rem;
}

.toc-list-link.is-active {
    background: var(--theme-bg);
    font-weight: 600;
}