.whatsapp-fab {
    position: fixed;
    right: calc(1.25rem + env(safe-area-inset-right));
    bottom: calc(1.25rem + env(safe-area-inset-bottom));
    z-index: 99991;
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.9rem 1.1rem 0.9rem 0.95rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 18px 36px rgba(18, 140, 126, 0.32);
    text-decoration: none;
    cursor: pointer;
    font-family: var(--font-body, 'Inter', sans-serif);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    white-space: nowrap;
    transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.whatsapp-fab:hover,
.whatsapp-fab:focus-visible {
    transform: translateY(-3px);
    box-shadow: 0 22px 42px rgba(18, 140, 126, 0.42);
    filter: brightness(1.02);
}

.whatsapp-fab:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.95);
    outline-offset: 3px;
}

.whatsapp-fab__icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.16);
    flex-shrink: 0;
    font-size: 1.2rem;
}

.whatsapp-fab__text {
    line-height: 1.1;
}

@media (max-width: 768px) {
    .whatsapp-fab {
        padding: 0;
        width: 56px;
        height: 56px;
        justify-content: center;
        gap: 0;
        border-radius: 50%;
    }

    .whatsapp-fab__text {
        display: none;
    }

    .whatsapp-fab__icon {
        width: 100%;
        height: 100%;
        background: transparent;
    }

    .whatsapp-fab__icon i {
        font-size: 1.45rem;
    }
}

@media (max-width: 480px) {
    .whatsapp-fab {
        right: calc(0.9rem + env(safe-area-inset-right));
        bottom: calc(0.9rem + env(safe-area-inset-bottom));
    }
}

@media (prefers-reduced-motion: reduce) {
    .whatsapp-fab {
        transition: none;
    }

    .whatsapp-fab:hover,
    .whatsapp-fab:focus-visible {
        transform: none;
    }
}