.black-hole {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.black-hole::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 150%;
  height: 140%;
  background: radial-gradient(ellipse at 50% 55%, transparent 10%, black 50%);
  z-index: 2;
}

.black-hole::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 50% 75%, #a900ff 20%, transparent 75%);
  mix-blend-mode: overlay;
  z-index: 5;
}

.aura {
  position: absolute;
  top: -71.5%;
  left: 50%;
  transform: translateX(-50%);
  width: 30%;
  height: 400%;
  background: linear-gradient(
    20deg,
    #00f8f1,
    #ffbd1e20 16.5%,
    #fe848f 33%,
    #fe848f20 49.5%,
    #00f8f1 66%,
    #00f8f160 85.5%,
    #ffbd1e 100%
  );
  background-size: 100% 200%;
  border-radius: 0 0 100% 100%;
  filter: blur(50px);
  mix-blend-mode: plus-lighter;
  opacity: 0.75;
  z-index: 3;
  animation: aura-glow 5s infinite linear;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    transparent,
    transparent 1px,
    white 1px,
    white 2px
  );
  mix-blend-mode: overlay;
  opacity: 0.5;
  z-index: 10;
}

.tunnel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 80%;
  z-index: 1;
}

.ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid #444;
  animation: ring-pulse 10s infinite linear;
}

@keyframes aura-glow {
  0% {
    background-position: 0 100%;
  }
  100% {
    background-position: 0 300%;
  }
}

@keyframes ring-pulse {
  0% {
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    width: 100%;
    height: 100%;
    opacity: 0;
  }
}

/* Create multiple rings with different sizes and delays */
.ring:nth-child(1) {
  animation-delay: 0s;
  width: 10%;
  height: 10%;
}
.ring:nth-child(2) {
  animation-delay: 1s;
  width: 20%;
  height: 20%;
}
.ring:nth-child(3) {
  animation-delay: 2s;
  width: 30%;
  height: 30%;
}
.ring:nth-child(4) {
  animation-delay: 3s;
  width: 40%;
  height: 40%;
}
.ring:nth-child(5) {
  animation-delay: 4s;
  width: 50%;
  height: 50%;
}
.ring:nth-child(6) {
  animation-delay: 5s;
  width: 60%;
  height: 60%;
}
.ring:nth-child(7) {
  animation-delay: 6s;
  width: 70%;
  height: 70%;
}
.ring:nth-child(8) {
  animation-delay: 7s;
  width: 80%;
  height: 80%;
}
.ring:nth-child(9) {
  animation-delay: 8s;
  width: 90%;
  height: 90%;
}
.ring:nth-child(10) {
  animation-delay: 9s;
  width: 100%;
  height: 100%;
}