/* --- BOUTON "RETOUR EN HAUT" --- */

/* Bouton flottant affiché en bas à droite */
.back-to-top {
    position: fixed;
    bottom: 10px;
    right: 10px;
    width: 45px; height: 45px;
    background: var(--accent-red);
    color: white;
    border: none; border-radius: 50%;
    font-size: 1.5rem; font-weight: bold;
    cursor: pointer; display: none;
    z-index: 2000; box-shadow: var(--shadow);
    transition: transform 0.2s, opacity 0.3s;
}
.back-to-top:hover {
    background: var(--accent-blue); 
}

/* Ajuste la position sur petit écran horizontal */
@media (max-width: 500px) and (max-height: 500px) {
    .back-to-top { bottom: 20px; right: 80px; }
}