.whatsapp-btn{
  --bg: #25D366;
  --bg-dark: #1ebe57;
  --text: #fff;
  --radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: linear-gradient(90deg, var(--bg) 0%, var(--bg-dark) 100%);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(37,211,102,0.18);
  transform: translateZ(0);
  will-change: transform;
  transition: box-shadow .25s ease, transform .18s ease;
  overflow: hidden;
}

.whatsapp-btn .w-icon,
.whatsapp-btn .w-text{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform .28s cubic-bezier(.2,.9,.2,1), opacity .2s;
}

.whatsapp-btn .w-icon{
  width: 28px;
  height: 28px;
  background: rgba(255,255,255,0.12);
  border-radius: 50%;
  padding: 4px;
  box-sizing: border-box;
  color: white;
  transform: translateX(-6px);
}

.whatsapp-btn .w-text{
  transform: translateX(0);
  white-space: nowrap;
  font-size: 15px;
}

/* Hover */
.whatsapp-btn:hover,
.whatsapp-btn:focus{
  box-shadow: 0 12px 30px rgba(37,211,102,0.22);
  transform: translateY(-3px);
  text-decoration: none;
  outline: none;
}
.whatsapp-btn:hover .w-icon,
.whatsapp-btn:focus .w-icon{
  transform: translateX(6px) scale(1.03);
}
.whatsapp-btn:hover .w-text,
.whatsapp-btn:focus .w-text{
  transform: translateX(6px);
}
.whatsapp-btn:active{
  transform: translateY(-1px) scale(.995);
}

/* RESPONSIVIDADE */
@media (max-width:480px){
  .whatsapp-btn{
    width:100%;            /* ocupa largura total no mobile */
    justify-content:center;
    padding:14px;
    font-size:16px;
  }
}
@media (max-width:360px){
  .whatsapp-btn .w-text{
    display:none;          /* esconde texto em telas muito pequenas */
  }
  .whatsapp-btn{
    width:56px;            /* vira botão circular */
    height:56px;
    padding:0;
    border-radius:50%;
  }
  .whatsapp-btn .w-icon{
    transform:none;
    width:32px;
    height:32px;
  }
}