:root {
    --deep-blue: #0a192f;
    --hydro-cyan: #0dcaf0;
}

body { font-family: 'Open Sans', sans-serif; background: #f0f2f5; }
h1, h2 { font-family: 'Montserrat', sans-serif; }

/* Header spécifique Bibliographie */
.biblio-header {
    height: 35vh;
    background: linear-gradient(rgba(10, 25, 47, 0.9), rgba(10, 25, 47, 0.9)), 
                url('https://images.unsplash.com/photo-1507842217343-583bb7270b66?auto=format&fit=crop&w=1600&q=80') center/cover;
}

/* Zone de contenu style "Papier" */
.biblio-content {
    border-top: 5px solid var(--hydro-cyan);
    line-height: 1.7;
}

.sources-list {
    border-left: 2px solid #dee2e6;
}



/* Navigation & Footer (Cohérence site) */
.custom-nav {
    background: rgba(10, 25, 47, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

#dynamic-footer {
    position: fixed;
    bottom: -100px; /* Caché par défaut */
    left: 0;
    right: 0;
    height: 80px;
    background: rgba(10, 25, 47, 0.98); /* Bleu très profond */
    backdrop-filter: blur(15px);
    border-top: 2px solid #0dcaf0; /* La ligne cyan du visuel */
    transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: 2000;
}

.texte_footer {
    color: #f0f2f5;
}

/* Classe ajoutée par le JavaScript au scroll */
#dynamic-footer.visible {
    bottom: 0;
}

.f-link {
    color: white;
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    opacity: 0.6;
    transition: 0.3s;
}

.f-link:hover {
    opacity: 1;
    color: #0dcaf0;
}

.letter-spacing-2 {
    letter-spacing: 2px;
}

/* Responsive : On empile sur mobile */
@media (max-width: 768px) {
    .border-start, .border-end { border: none !important; }
    .f-link { font-size: 0.65rem; }
}