.a-Wa-S1 {
    position: fixed;
    bottom: 3rem;
    right: 2rem;
    z-index: 1000;
    
    width: 4rem;
    height: 4rem;
    
    background-color: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.15);
    cursor: pointer;
    
    text-decoration: none;
    
    animation: wa-float-in 0.6s ease-out;
}

.a-Wa-S1 .Wa-S1 {
    color: white;
    font-size: 2rem;
    line-height: 1;
    transition: transform 0.3s ease;
}

.a-Wa-S1:hover {
    transform: scale(1.05) translateY(-0.15rem);
    
    box-shadow: 0 0.5rem 1.5rem rgba(37, 211, 102, 0.4);
    
    background-color: #128C7E;
}

.a-Wa-S1:hover .Wa-S1 {
    transform: rotate(10deg) scale(1.05);
}

.a-Wa-S1:focus {
    outline: 0.25rem solid rgba(37, 211, 102, 0.5);
    outline-offset: 0.25rem;
}

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

@keyframes wa-float-in {
    0% {
        opacity: 0;
        transform: scale(0.3) translateY(2rem);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05) translateY(-0.5rem);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes wa-pulse {
    0%, 100% {
        box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.15);
    }
    50% {
        box-shadow: 0 0.25rem 1rem rgba(37, 211, 102, 0.3);
    }
}

.a-Wa-S1 {
    animation: wa-float-in 0.6s ease-out, wa-pulse 3s ease-in-out infinite 2s;
}

body.dark .a-Wa-S1 {
    background-color: #1a5c3a;
    
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.3);
}

body.dark .a-Wa-S1:hover {
    background-color: #0f4a2a;
    
    box-shadow: 0 0.5rem 1.5rem rgba(26, 92, 58, 0.5);
}

body.dark .a-Wa-S1:focus {
    outline-color: rgba(26, 92, 58, 0.6);
}

@media screen and (min-width: 30rem) {
    .a-Wa-S1 {
        width: 5rem;
        height: 5rem;
        bottom: 2.5rem;
        right: 2.5rem;
    }
    
    .a-Wa-S1 .Wa-S1 {
        font-size: 2.8rem;
    }
    
    .a-Wa-S1:hover {
        transform: scale(1.05) translateY(-0.2rem);
    }
    
    .a-Wa-S1:hover .Wa-S1 {
        transform: rotate(12deg) scale(1.05);
    }
}

@media screen and (min-width: 48rem) {
    .a-Wa-S1 {
        width: 6rem;
        height: 6rem;
        bottom: 3.25rem;
        right: 3.25rem;
    }
    
    .a-Wa-S1 .Wa-S1 {
        font-size: 3rem;
    }
    
     Hover más pronunciado */
    .a-Wa-S1:hover {
        transform: scale(1.08) translateY(-0.25rem);
    }
    
    .a-Wa-S1:hover .Wa-S1 {
        transform: rotate(15deg) scale(1.08);
    }
}

@media screen and (min-width: 64rem) {
    .a-Wa-S1:hover {
        transform: scale(1.1) translateY(-0.25rem);
    }
    
    .a-Wa-S1:hover .Wa-S1 {
        transform: rotate(15deg) scale(1.1);
    }
}

.a-Wa-S1::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.a-Wa-S1:active::after {
    width: 2.75rem;
    height: 2.75rem;
}

@media screen and (min-width: 48rem) {
    .a-Wa-S1:active::after {
        width: 3.5rem;
        height: 3.5rem;
    }
}

@media screen and (min-width: 64rem) {
    .a-Wa-S1:active::after {
        width: 4rem;
        height: 4rem;
    }
}

.a-Wa-S1,
.a-Wa-S1 .Wa-S1 {
    will-change: transform;
}

.a-Wa-S1.hidden {
    opacity: 0;
    transform: scale(0);
    pointer-events: none;
}

.a-Wa-S1.visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}