.pv-contact-bar {
  position: fixed;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 99999;
}
.pv-right { right: 20px; }
.pv-left { left: 20px; }
.pv-btn {
  position: relative;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #00bcd4;
  transition: all 0.3s ease;
  overflow: visible;
}
.pv-btn:hover { transform: scale(1.1); }

/* Sóng 3 lớp mượt */
.pv-call {
  box-shadow: 0 0 15px rgba(0,188,212,0.6);
}
.pv-call .wave {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 2px solid rgba(0,188,212,0.6);
  border-radius: 50%;
  animation: callwave 1.8s linear infinite;
}
.pv-call .wave.delay1 { animation-delay: 0.6s; }
.pv-call .wave.delay2 { animation-delay: 1.2s; }
@keyframes callwave {
  0% { transform: scale(1); opacity: 0.8; }
  70% { transform: scale(2.2); opacity: 0.3; }
  100% { transform: scale(2.8); opacity: 0; }
}
.pv-zalo {
  font-family: Arial, sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: #fff;
}
@media(min-width:768px){ .pv-hide-desktop{display:none!important;} }
@media(max-width:767px){ .pv-hide-mobile{display:none!important;} }