.phongvt-scroll-section {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 9999;
}

.phongvt-floating-button {
  width: 60px;
  height: 60px;
  background-color: #28a745;
  border-radius: 50%;
  text-align: center;
  line-height: 60px;
  color: white;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}
.phongvt-floating-button:hover {
  transform: scale(1.1);
}

.phongvt-contact-icons {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  position: absolute;
  bottom: 70px;
  right: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.phongvt-contact-icons.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.phongvt-contact-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  color: white;
  font-size: 20px;
  margin: 8px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 3px 5px rgba(0,0,0,0.2);
  transition: transform 0.2s ease;
  position: relative;
  text-decoration: none;
  background-color: #007bff;
}
.phongvt-contact-icon:hover {
  transform: scale(1.1);
}
.phongvt-contact-icon img {
  width: 24px;
  height: 24px;
}
.phongvt-contact-icon i {
  font-size: 22px;
}

.phongvt-zalo { background-color: #0068ff; }
.phongvt-messenger { background-color: #0084ff; }
.phongvt-phone { background-color: #28a745; }
.phongvt-maps { background-color: #e74c3c; }

/* Lắc liên tục */
@keyframes shake-loop {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(8deg); }
  50% { transform: rotate(-8deg); }
  75% { transform: rotate(8deg); }
}
.phongvt-shake-icon i {
  animation: shake-loop 1.2s ease-in-out infinite;
  display: inline-block;
}

/* Lắc 1 lần khi vào trang */
@keyframes shake-once {
  0%, 100% { transform: rotate(0deg); }
  20% { transform: rotate(8deg); }
  40% { transform: rotate(-8deg); }
  60% { transform: rotate(6deg); }
  80% { transform: rotate(-6deg); }
}
.phongvt-shake-once {
  animation: shake-once 0.8s ease-in-out 0.5s 1;
}

/* Tooltip */
.phongvt-contact-icon::after {
  content: attr(title);
  position: absolute;
  top: 50%;
  right: 60px;
  transform: translateY(-50%) translateX(10px) scale(0.95);
  background-color: #333;
  color: #fff;
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 9999;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.phongvt-contact-icon::before {
  content: "";
  position: absolute;
  top: 50%;
  right: 52px;
  transform: translateY(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 9998;
  border-radius: 2px;
  background-color: #333;
}

.phongvt-contact-icon:hover::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0px) scale(1);
}
.phongvt-contact-icon:hover::before {
  opacity: 1;
}

/* Zalo */
.phongvt-zalo::after,
.phongvt-zalo::before {
  background-color: #0068ff;
}
.phongvt-zalo:hover::after,
.phongvt-zalo:hover::before {
  background-color: #004dcc;
}

/* Messenger */
.phongvt-messenger::after,
.phongvt-messenger::before {
  background-color: #0084ff;
}
.phongvt-messenger:hover::after,
.phongvt-messenger:hover::before {
  background-color: #0066cc;
}

/* Gọi điện */
.phongvt-phone::after,
.phongvt-phone::before {
  background-color: #28a745;
}
.phongvt-phone:hover::after,
.phongvt-phone:hover::before {
  background-color: #1e7e34;
}

/* Chỉ đường */
.phongvt-maps::after,
.phongvt-maps::before {
  background-color: #e74c3c;
}
.phongvt-maps:hover::after,
.phongvt-maps:hover::before {
  background-color: #c0392b;
}

.phongvt-floating-button {
  position: relative;
  animation: phongvt-glow-rainbow 4s infinite ease-in-out;
  background-color: #007bff !important;
  overflow: hidden;
}

.phongvt-floating-button .phongvt-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 22px;
  color: white;
  display: none;
}

.phongvt-floating-button.phongvt-icon-cycle .icon-1 { display: block; }
.phongvt-floating-button.phongvt-icon-cycle-2 .icon-2 { display: block; }
.phongvt-floating-button.phongvt-icon-cycle-3 .icon-3 { display: block; }

@keyframes phongvt-glow-rainbow {
  0%   { box-shadow: 0 0 20px 10px rgba(255, 0, 0, 0.6); background-color: #ff0000; }
  20%  { box-shadow: 0 0 20px 10px rgba(255, 165, 0, 0.6); background-color: #ffa500; }
  40%  { box-shadow: 0 0 20px 10px rgba(255, 255, 0, 0.6); background-color: #ffff00; }
  60%  { box-shadow: 0 0 20px 10px rgba(0, 128, 0, 0.6); background-color: #008000; }
  80%  { box-shadow: 0 0 20px 10px rgba(0, 0, 255, 0.6); background-color: #0000ff; }
  100% { box-shadow: 0 0 20px 10px rgba(75, 0, 130, 0.6); background-color: #4b0082; }
}