.zalo-float {
  position: fixed;
  right: max(20px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 9999;
  display: inline-flex;
  box-sizing: border-box;
  align-items: center;
  gap: 10px;
  min-height: 56px;
  max-width: calc(100vw - 32px);
  padding: 7px 18px 7px 8px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 999px;
  background: #0068ff;
  box-shadow: 0 12px 30px rgba(0, 78, 190, 0.3);
  color: #fff;
  font: 700 15px/1.2 Arial, "Helvetica Neue", sans-serif;
  letter-spacing: 0;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.zalo-float:hover {
  background: #0057d9;
  box-shadow: 0 16px 34px rgba(0, 78, 190, 0.38);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
}

.zalo-float:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(0, 104, 255, 0.5), 0 16px 34px rgba(0, 78, 190, 0.38);
}

.zalo-float__icon {
  position: relative;
  z-index: 1;
  display: block;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
}

.zalo-float__label {
  position: relative;
  z-index: 1;
  white-space: nowrap;
}

.zalo-float::after {
  content: "";
  position: absolute;
  inset: -5px;
  z-index: -1;
  border: 2px solid rgba(0, 104, 255, 0.35);
  border-radius: inherit;
  animation: zalo-float-pulse 2.4s ease-out infinite;
  pointer-events: none;
}

@keyframes zalo-float-pulse {
  0%, 45% { opacity: 0; transform: scale(0.96); }
  55% { opacity: 0.8; }
  100% { opacity: 0; transform: scale(1.12); }
}

@media (max-width: 640px) {
  .zalo-float {
    right: max(14px, env(safe-area-inset-right));
    bottom: max(14px, env(safe-area-inset-bottom));
    width: 54px;
    height: 54px;
    min-height: 54px;
    padding: 6px;
    justify-content: center;
    font-size: 14px;
  }

  .zalo-float__icon {
    flex-basis: 40px;
    width: 40px;
    height: 40px;
  }

  .zalo-float__label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .zalo-float,
  .zalo-float::after {
    animation: none;
    transition: none;
  }
}