:root {
  --sd-size: 48px;
  --sd-size-child: 44px;
  --sd-radius: 96px;
  --sd-bottom: 92px;
  --sd-right: 32px;
  --sd-shadow: 0 4px 16px rgba(0, 123, 243, 0.38);
  --sd-shadow-hover: 0 6px 22px rgba(0, 123, 243, 0.52);
  --sd-transition: 0.32s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.speed-dial {
  position: fixed;
  bottom: var(--sd-bottom);
  right: var(--sd-right);
  width: var(--sd-size);
  height: var(--sd-size);
  z-index: 995;
}

.speed-dial__main {
  position: absolute;
  bottom: 0;
  right: 0;
  width: var(--sd-size);
  height: var(--sd-size);
  border-radius: 50%;
  background: linear-gradient(135deg, #4facf7 0%, #007bf3 100%);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--sd-shadow);
  transition:
    box-shadow 0.2s ease,
    transform 0.2s ease;
  z-index: 2;
  overflow: hidden;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.speed-dial__main:hover {
  box-shadow: var(--sd-shadow-hover);
  transform: scale(1.08);
}

.speed-dial__main:focus-visible {
  outline: 3px solid rgba(0, 123, 243, 0.45);
  outline-offset: 3px;
}

.speed-dial__icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  transition:
    opacity 0.22s ease,
    transform 0.22s ease;
}

.speed-dial__icon--cycle {
  opacity: 1;
  transform: scale(1);
}

.speed-dial__icon--close {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

.speed-dial.is-open .speed-dial__icon--cycle {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

.speed-dial.is-open .speed-dial__icon--close {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.speed-dial__main::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(79, 172, 247, 0.55);
  animation: sdPulse 2.8s ease-out infinite;
  pointer-events: none;
}

.speed-dial.is-open .speed-dial__main::after {
  animation: none;
  opacity: 0;
}

@keyframes sdPulse {
  0% {
    transform: scale(1);
    opacity: 0.8;
  }
  70% {
    transform: scale(1.55);
    opacity: 0;
  }
  100% {
    transform: scale(1.55);
    opacity: 0;
  }
}

.speed-dial__child {
  position: absolute;
  bottom: 0;
  right: 0;
  width: var(--sd-size-child);
  height: var(--sd-size-child);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.22);

  opacity: 0;
  transform: translate(0, 0) scale(0);
  pointer-events: none;
  transition:
    transform var(--sd-transition),
    opacity 0.22s ease,
    box-shadow 0.2s ease;
  z-index: 1;
  -webkit-tap-highlight-color: transparent;
}

.speed-dial.is-open .speed-dial__child {
  opacity: 1;
  pointer-events: auto;
}

.speed-dial.is-open .speed-dial__child--email {
  transform: translate(-96px, 0) scale(1);
  transition-delay: 0s;
}

.speed-dial.is-open .speed-dial__child--fb {
  transform: translate(-83px, -48px) scale(1);
  transition-delay: 0.05s;
}

.speed-dial.is-open .speed-dial__child--zalo {
  transform: translate(-48px, -83px) scale(1);
  transition-delay: 0.1s;
}

.speed-dial.is-open .speed-dial__child--tg {
  transform: translate(0, -96px) scale(1);
  transition-delay: 0.15s;
}

.speed-dial .speed-dial__child--tg {
  transition-delay: 0s;
}
.speed-dial .speed-dial__child--zalo {
  transition-delay: 0.04s;
}
.speed-dial .speed-dial__child--fb {
  transition-delay: 0.08s;
}
.speed-dial .speed-dial__child--email {
  transition-delay: 0.12s;
}

.speed-dial.is-open .speed-dial__child--email {
  transition-delay: 0s;
}
.speed-dial.is-open .speed-dial__child--fb {
  transition-delay: 0.05s;
}
.speed-dial.is-open .speed-dial__child--zalo {
  transition-delay: 0.1s;
}
.speed-dial.is-open .speed-dial__child--tg {
  transition-delay: 0.15s;
}

.speed-dial__child:hover {
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
  filter: brightness(1.1);
}

.speed-dial__child--email {
  background: linear-gradient(135deg, #4facf7, #007bf3);
}

.speed-dial__child--fb {
  background: linear-gradient(135deg, #1877f2, #0d65d9);
}

.speed-dial__child--zalo {
  background: linear-gradient(135deg, #0068ff, #004ecc);
}

.speed-dial__child--tg {
  background: linear-gradient(135deg, #2ca5e0, #0088cc);
}

.speed-dial__icon--cycle i {
  transition:
    opacity 0.22s ease,
    transform 0.22s ease;
}

.speed-dial__icon--cycle i.is-fading {
  opacity: 0;
  transform: scale(0.5);
}

@media (max-width: 1024px) {
  .speed-dial.is-open .speed-dial__child--email {
    transform: translate(-90px, 0) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--fb {
    transform: translate(-78px, -45px) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--zalo {
    transform: translate(-45px, -78px) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--tg {
    transform: translate(0, -90px) scale(1);
  }
}

@media (max-width: 768px) {
  :root {
    --sd-size: 44px;
    --sd-size-child: 40px;
    --sd-bottom: 84px;
    --sd-right: 20px;
  }

  .speed-dial__main {
    font-size: 17px;
  }

  .speed-dial__icon {
    font-size: 17px;
  }

  .speed-dial__child {
    font-size: 15px;
  }

  .speed-dial.is-open .speed-dial__child--email {
    transform: translate(-82px, 0) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--fb {
    transform: translate(-71px, -41px) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--zalo {
    transform: translate(-41px, -71px) scale(1);
  }
  .speed-dial.is-open .speed-dial__child--tg {
    transform: translate(0, -82px) scale(1);
  }
}

@media (max-width: 480px) {
  :root {
    --sd-bottom: 80px;
    --sd-right: 18px;
  }
}