.scroll-to-top-btn {
    position: fixed;
    bottom: 20px;
    right: 25px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    z-index: 9999;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: none;
}

    .scroll-to-top-btn:hover {
        transform: scale(1.1);
        box-shadow: 0 6px 25px rgba(0, 0, 0, 0.2);
    }

.whatsapp-button {
    transition: right 0.3s ease;
}

@media (max-width: 768px) {
    .scroll-to-top-btn {
        bottom: 15px;
        right: 20px;
        width: 50px;
        height: 50px;
    }

        .scroll-to-top-btn i {
            font-size: 20px;
        }

    .whatsapp-button.scroll-visible {
        right: 75px !important;
    }
}

@media (max-width: 480px) {
    .scroll-to-top-btn {
        bottom: 12px;
        right: 15px;
        width: 45px;
        height: 45px;
    }

        .scroll-to-top-btn i {
            font-size: 18px;
        }

    .whatsapp-button.scroll-visible {
        right: 65px !important;
    }
}

@media (max-width: 360px) {
    .scroll-to-top-btn {
        bottom: 10px;
        right: 12px;
        width: 40px;
        height: 40px;
    }

        .scroll-to-top-btn i {
            font-size: 16px;
        }

    .whatsapp-button.scroll-visible {
        right: 55px !important;
    }
}

@media (min-width: 769px) {
    .whatsapp-button.scroll-visible {
        right: 90px !important;
    }
}