#boton-login-logout {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 9999;
    animation: fadeIn 1s ease-in-out;
}

#boton-login-logout a {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #1e90ff;
    color: white;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 24px;
}

#boton-login-logout a:hover {
    background-color: #0d74d1;
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.4);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}