/* Tocbot Styles */
.toc {
    position: fixed;
    top: 100px; /* Adjust based on header height */
    right: 20px;
    width: 250px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: var(--spacing-md);
    background-color: var(--color-bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 6px var(--color-shadow);
    z-index: 90;
    display: none; /* Hidden by default, shown by JS if content exists */
    opacity: 0;
    transform: translateX(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.toc.is-visible {
    display: block;
    opacity: 1;
    transform: translateX(0);
}

/* Mobile Responsive Styles */
.toc-fab {
    display: none;
    position: fixed;
    top: calc(var(--header-height) + 1rem); /* Below header */
    right: 1rem;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--color-bg-surface);
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 12px var(--color-shadow);
    z-index: 95;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.toc-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--color-shadow);
    color: var(--color-primary);
}

.toc-fab:active {
    transform: translateY(0);
}

@media (max-width: 1200px) {
    /* Show FAB when TOC is active (content exists) */
    .toc.is-visible ~ .toc-fab {
        display: flex;
    }

    .toc {
        display: none !important;
        position: fixed;
        top: calc(var(--header-height) + 4.5rem); /* Below FAB */
        right: 1rem;
        left: auto;
        width: 250px;
        max-width: 80vw;
        max-height: 60vh;
        height: auto;
        margin: 0;
        border-radius: var(--radius-md);
        border: 1px solid var(--color-border);
        transform: none;
        background-color: var(--color-bg-surface);
        box-shadow: 0 4px 20px var(--color-shadow);
        z-index: 94;
    }

    .toc.is-open-mobile {
        display: block !important;
        animation: tocFadeIn 0.2s ease forwards;
    }
}

@keyframes tocFadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.toc-list .toc-list {
    padding-left: var(--spacing-md);
    margin-top: var(--spacing-xs);
}

.toc-link {
    display: block;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 2px 0;
    transition: color var(--transition-fast);
    line-height: 1.4;
}

.toc-link:hover {
    color: var(--color-primary);
}

.is-active-link {
    color: var(--color-primary);
    font-weight: 600;
}

.is-collapsed {
    max-height: 0;
    overflow: hidden;
}

/* Custom Scrollbar for TOC */
.toc::-webkit-scrollbar {
    width: 4px;
}

.toc::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 2px;
}