.a-Wa-S1 {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 4.5rem;
    height: 4.5rem;
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
    color: #fff;
    font-size: 1.8rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50%;
    box-shadow: 0 0.8rem 2rem rgba(37, 211, 102, 0.3), 0 0.4rem 0.8rem rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: pulse 2s infinite;
    border: 3px solid rgba(255, 255, 255, 0.9);
}

.a-Wa-S1:hover {
    background: linear-gradient(135deg, #128c7e 0%, #075e54 100%);
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 1.2rem 3rem rgba(37, 211, 102, 0.4), 0 0.6rem 1.2rem rgba(0, 0, 0, 0.15);
    animation: none;
}

.a-Wa-S1:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0.8rem 2rem rgba(37, 211, 102, 0.3), 0 0.4rem 0.8rem rgba(0, 0, 0, 0.1), 0 0 0 0 rgba(37, 211, 102, 0.4);
    }
    70% {
        box-shadow: 0 0.8rem 2rem rgba(37, 211, 102, 0.3), 0 0.4rem 0.8rem rgba(0, 0, 0, 0.1), 0 0 0 1.5rem rgba(37, 211, 102, 0);
    }
    100% {
        box-shadow: 0 0.8rem 2rem rgba(37, 211, 102, 0.3), 0 0.4rem 0.8rem rgba(0, 0, 0, 0.1), 0 0 0 0 rgba(37, 211, 102, 0);
    }
}

.Wa-S1 {
    font-size: 1.8rem;
    line-height: 1;
    filter: drop-shadow(0 0.1rem 0.2rem rgba(0, 0, 0, 0.1));
}

body.dark .a-Wa-S1 {
    background: linear-gradient(135deg, #128c7e 0%, #075e54 100%);
    border-color: rgba(200, 255, 230, 0.3);
    box-shadow: 0 0.8rem 2rem rgba(18, 140, 126, 0.4), 0 0.4rem 0.8rem rgba(0, 0, 0, 0.2);
}

body.dark .a-Wa-S1:hover {
    background: linear-gradient(135deg, #075e54 0%, #054741 100%);
    box-shadow: 0 1.2rem 3rem rgba(18, 140, 126, 0.5), 0 0.6rem 1.2rem rgba(0, 0, 0, 0.3);
}

@media (min-width: 48rem) {
    .a-Wa-S1 {
        width: 5rem;
        height: 5rem;
        font-size: 2rem;
    }

    .Wa-S1 {
        font-size: 2.2rem;
    }
}

@media (min-width: 64rem) {
    .a-Wa-S1 {
        width: 5.5rem;
        height: 5.5rem;
        font-size: 2.2rem;
        bottom: 2.5rem;
        right: 2.5rem;
    }

    .Wa-S1 {
        font-size: 2.5rem;
    }
}

@media (min-width: 90rem) {
    .a-Wa-S1 {
        width: 6rem;
        height: 6rem;
        font-size: 2.4rem;
    }

    .Wa-S1 {
        font-size: 2.8rem;
    }
}