/* Back to Top Button - Pro Style */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary); /* Deep blue */
    color: white;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s ease;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top:hover {
    background: var(--secondary); /* Green hover */
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(16, 185, 129, 0.4);
}

#back-to-top i {
    transition: transform 0.3s ease;
}

#back-to-top:hover i {
    transform: translateY(-3px);
}

/* Responsive - smaller on mobile */
@media (max-width: 768px) {
    #back-to-top {
        width: 45px;
        height: 45px;
        font-size: 1.4rem;
        bottom: 20px;
        right: 20px;
    }
}