/* Table of Contents Styles */
.toc-sidebar {
    width: 0;
    background: var(--bg-primary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
    transition: width 0.3s ease;
    overflow: hidden;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.toc-sidebar.active {
    width: 320px;
}

.toc-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.toc-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.toc-close {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
}

.toc-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.toc-search {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.toc-search input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: 'Source Sans Pro', sans-serif;
    transition: var(--transition);
}

.toc-search input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(74, 85, 104, 0.1);
    background: var(--bg-primary);
}

.toc-content {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

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

.toc-item {
    margin: 0;
}

.toc-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.toc-link:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-left-color: var(--accent);
}

.toc-title {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.4;
}

.toc-page {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-left: 0.75rem;
    flex-shrink: 0;
}

.toc-level-0 .toc-link {
    font-weight: 600;
    color: var(--text-primary);
}

.toc-level-1 .toc-link {
    padding-left: 2rem;
    font-size: 0.8rem;
}

.toc-level-2 .toc-link {
    padding-left: 3rem;
    font-size: 0.75rem;
}

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

.toc-loading,
.toc-empty {
    padding: 2rem 1.25rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
    font-style: italic;
}

.toc-btn.active {
    background: var(--bg-tertiary);
    border-color: var(--accent);
}

/* Adjust PDF container when TOC is open */
.toc-sidebar.active ~ .pdf-viewer-container {
    margin-left: 320px;
    transition: margin-left 0.3s ease;
}

@media (max-width: 768px) {
    .toc-sidebar.active {
        width: 280px;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    }
    
    .toc-sidebar.active ~ .pdf-viewer-container {
        margin-left: 280px;
    }
    
    .toc-sidebar.active::before {
        content: '';
        position: fixed;
        top: 0;
        left: 280px;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }
}