/* Chapter Navigation */
.chapter-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    align-items: center;
    margin: 2rem 0;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 4px;
    gap: 1rem;
}

.chapter-navigation a {
    text-decoration: none;
    color: #333;
    padding: 0.5rem 1em;
    border-radius: 4px;
    transition: background-color 0.2s;
    border: 1px solid #dee2e6;
    height: 100%;
}

.chapter-navigation a:hover {
    background-color: #e9ecef;
}

.chapter-navigation .nav-prev {
    display: flex;
    gap: 0.5rem;
    justify-self: start;
}

.chapter-navigation .nav-next {
    display: flex;
    gap: 0.5rem;
    justify-self: end;
}

.chapter-navigation .nav-toc {
    font-weight: 500;
    justify-self: center;
    text-align: center;
}

/* Table of Contents */
.book-toc {
    margin: 2rem 0;
    padding: 2rem;
    background: #fff;
    border: 1px solid #dee2e6;
    border-radius: 8px;
}

.book-toc h2 {
    margin: 0 0 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #dee2e6;
}

.chapter-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
}

.chapter-item a {
    display: block;
    padding: 1rem;
    text-decoration: none;
    color: #333;
    background: #f8f9fa;
    border-radius: 4px;
    transition: all 0.2s;
}

.chapter-item a:hover {
    background: #e9ecef;
    transform: translateX(4px);
}

/* Book Meta */
.book-meta {
    margin: 2rem 0;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.book-meta > div {
    margin-bottom: 0.5rem;
}

.book-meta strong {
    color: #666;
    margin-right: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .chapter-navigation {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .chapter-navigation a {
        width: 100%;
    }
    
    .chapter-list {
        grid-template-columns: 1fr;
    }
}