.film-back {
  position: relative;
  display: inline-flex;
  height: 36px;
  align-items: center;
  justify-content: center;
  gap: 11px;
  padding: 0 17px 0 13px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background:
    radial-gradient(90% 160% at 8% -70%, rgba(255, 255, 255, 0.13), transparent 68%),
    #1d1d1d;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.055);
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  transition:
    border-color 220ms ease,
    color 220ms ease,
    background 220ms ease,
    transform 180ms ease;
}

.film-back > span:first-child {
  color: #ff5a00;
  font-size: 25px;
  line-height: 0;
  transform: translateY(-1px);
}

.film-back:hover,
.film-back:focus-visible {
  border-color: rgba(255, 255, 255, 0.25);
  background-color: #262626;
  color: #fff;
  outline: none;
}

.film-back:active {
  transform: scale(0.97);
}

.film-border-glow {
  position: absolute;
  z-index: 3;
  left: 50%;
  width: 88%;
  height: 1px;
  opacity: 0;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    rgba(221, 222, 227, 0) 0%,
    #dddee3 40%,
    #dddee3 60%,
    rgba(221, 222, 227, 0) 100%
  );
  transform: translateX(-50%) scaleX(0);
  will-change: opacity, transform;
}

.film-border-glow--top {
  top: 0;
}

.film-border-glow--bottom {
  bottom: 0;
}

.film-back:hover .film-border-glow--top,
.film-back:focus-visible .film-border-glow--top {
  animation: film-border-glow 4s linear infinite;
}

.film-back:hover .film-border-glow--bottom,
.film-back:focus-visible .film-border-glow--bottom {
  animation: film-border-glow-reverse 4s linear infinite;
}

@keyframes film-border-glow {
  0% {
    opacity: 0;
    transform: translateX(-50%) scaleX(0);
    transform-origin: left center;
  }
  3% {
    opacity: 1;
  }
  45%,
  54.99% {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
    transform-origin: left center;
  }
  55% {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
    transform-origin: right center;
  }
  97% {
    opacity: 1;
    transform: translateX(-50%) scaleX(0);
    transform-origin: right center;
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) scaleX(0);
    transform-origin: right center;
  }
}

@keyframes film-border-glow-reverse {
  0% {
    opacity: 0;
    transform: translateX(-50%) scaleX(0);
    transform-origin: right center;
  }
  3% {
    opacity: 1;
  }
  45%,
  54.99% {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
    transform-origin: right center;
  }
  55% {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
    transform-origin: left center;
  }
  97% {
    opacity: 1;
    transform: translateX(-50%) scaleX(0);
    transform-origin: left center;
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) scaleX(0);
    transform-origin: left center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .film-border-glow {
    animation: none !important;
  }

  .film-back {
    transition-duration: 1ms;
  }

  .film-back:hover .film-border-glow,
  .film-back:focus-visible .film-border-glow {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
  }
}