/* Bouton flottant */
#scrollTopBtn {
    position: fixed;
    bottom: 100px;
    right: 25px;
    z-index: 999;

    background: #e87684; /* style Leboncoin */
    color: white;
    border: none;
    border-radius: 50%;
    
    width: 50px;
    height: 50px;

    display: flex;
    align-items: center;
    justify-content: center;

    font-size: 18px;
    cursor: pointer;

    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: all 0.3s ease;

    opacity: 0;
    visibility: hidden;
}

/* Hover */
#scrollTopBtn:hover {
    background: #db5665;
    transform: translateY(-3px);
}

/* Visible quand on scroll */
#scrollTopBtn.show {
    opacity: 1;
    visibility: visible;
}