/** estilos para botón de llamada flotante */
.btn-call {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  /*background: #25D366;  Verde estilo WhatsApp */
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(0,0,0,.25);
  z-index: 2147483647;
  text-decoration: none;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn-call:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(0,0,0,.28); background:#aec1ff; }
.btn-call:active { transform: translateY(0); }
.btn-call:focus { outline: 2px solid #c0f2d7; outline-offset: 3px; }

/* Efecto pulso opcional */
.btn-call::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid rgba(37,211,102,.45);
  animation: pulse 1.8s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(1); opacity: .8; }
  70% { transform: scale(1.6); opacity: 0; }
  100% { transform: scale(1.6); opacity: 0; }
}