.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Active navigation link */
nav a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Mobile menu improvements */
@media (max-width: 768px) {
    nav {
        padding: 0.5rem 0;
    }
    
    nav ul {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav li {
        padding: 0.3rem;
    }
    
    nav a {
        font-size: 0.9rem;
        padding: 0.3rem 0.6rem;
    }
}

/* Small screen optimizations */
@media (max-width: 480px) {
    section {
        padding: 2rem 0;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .step-content h3, 
    .rec-item h4 {
        font-size: 0.9rem;
    }
}