.chapter-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    margin: 3rem 0 2rem 0;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.chapter-nav-prev, .chapter-nav-next {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}
.chapter-nav-prev:hover, .chapter-nav-next:hover {
    background: var(--bg-hover);
}
.chapter-nav-current {
    font-weight: 600;
    color: var(--text-primary);
}