/* ========================================
   NAVIGATION DES CHAPITRES - Design moderne
   ======================================== */

/* Navigation séquentielle en haut */
.chapter-sequential-navigation {
    margin: 3rem 0;
    padding: 0;
}

.navigation-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Boutons de navigation */
.nav-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.75rem;
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 12px;
    border: 2px solid #E30613;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(227, 6, 19, 0.2);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(227, 6, 19, 0.2), transparent);
    transition: left 0.5s ease;
}

.nav-btn:hover::before {
    left: 100%;
}

.nav-btn:hover {
    background: linear-gradient(135deg, #9E1514 0%, #E30613 100%);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(227, 6, 19, 0.4);
    text-decoration: none;
    border-color: #FFD700;
}

.nav-btn.disabled {
    background: #2a2a2a;
    color: #666;
    border-color: #3a3a3a;
    cursor: not-allowed;
    opacity: 0.5;
}

.nav-btn.disabled:hover {
    background: #2a2a2a;
    color: #666;
    transform: none;
    box-shadow: none;
}

.nav-btn.disabled::before {
    display: none;
}

.nav-btn svg {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.nav-btn:hover svg {
    transform: scale(1.2);
}

.nav-btn.nav-prev {
    justify-content: flex-start;
}

.nav-btn.nav-next {
    justify-content: flex-end;
}

.nav-btn.nav-home {
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, #E30613 0%, #9E1514 100%);
    border-color: #FFD700;
    min-width: 120px;
}

.nav-btn.nav-home:hover {
    background: linear-gradient(135deg, #FFD700 0%, #D0B74D 100%);
    color: #000000;
    border-color: #E30613;
}

.nav-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
}

.nav-btn.nav-next .nav-text {
    align-items: flex-end;
}

.nav-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    font-weight: 700;
}

.nav-title {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}


/* Responsive Design */
@media (max-width: 1024px) {
    .navigation-controls {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 1rem;
    }
    
    .nav-btn.nav-prev {
        order: 2;
    }
    
    .nav-btn.nav-home {
        order: 1;
        width: 100%;
    }
    
    .nav-btn.nav-next {
        order: 3;
    }
}

@media (max-width: 768px) {
    .chapter-sequential-navigation {
        margin: 2rem 0;
    }
    
    .navigation-controls {
        gap: 0.75rem;
    }
    
    .nav-btn {
        padding: 1rem 1.25rem;
        width: 100%;
    }
    
    .nav-btn.nav-prev,
    .nav-btn.nav-next {
        justify-content: center;
    }
    
    .nav-text {
        align-items: center;
    }
    
    .nav-btn.nav-next .nav-text {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .nav-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .nav-label {
        font-size: 0.7rem;
    }
    
    .nav-title {
        font-size: 0.85rem;
        -webkit-line-clamp: 1;
    }
    
    .nav-btn svg {
        width: 20px;
        height: 20px;
    }
}