<!--
  Author: @codepeek
  License: MIT
  Tags: #buttons #css #interface #opensource #codepeek
-->
<div class="neon-gate-loader" role="status" aria-label="Loading">
  <span class="gate-star star-a">
  </span>
  <span class="gate-star star-b">
  </span>
  <span class="gate-star star-c">
  </span>
  <span class="neon-gate">
    <span class="gate-beam">
    </span>
    <span class="gate-core">
    </span>
    <i class="gate-node node-a">
    </i>
    <i class="gate-node node-b">
    </i>
    <i class="gate-node node-c">
    </i>
    <i class="gate-node node-d">
    </i>
  </span>
  <span class="gate-caption">
    SYNCHRONIZING
  </span>
</div>

/*
 * Author: @codepeek
 * License: MIT
 * Tags: #buttons #css #interface #opensource #codepeek
 */

.neon-gate-loader {
  --cyan: #54f6dc;
  --blue: #4584ff;
  --violet: #af6cff;
  position: relative;
  display: grid;
  width: 166px;
  height: 118px;
  place-items: center;
  overflow: hidden;
  margin: auto;
  border-radius: 14px;
  background: radial-gradient(circle at 50% 43%, #152346 0, #090c15 43%, #050609 100%);
  box-shadow: inset 0 0 26px #000, 0 8px 20px rgba(0, 0, 0, .3);
  font-family: Arial, sans-serif;
}
.neon-gate-loader::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .22;
  background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(121, 192, 255, .18) 4px 5px);
  pointer-events: none;
}
.neon-gate {
  position: relative;
  z-index: 2;
  width: 82px;
  height: 70px;
  overflow: hidden;
  border: 1px solid rgba(84, 246, 220, .85);
  border-radius: 6px;
  background: rgba(4, 14, 29, .56);
  box-shadow: 0 0 5px var(--cyan), inset 0 0 10px rgba(84, 246, 220, .18);
}
.neon-gate::before, .neon-gate::after {
  content: "";
  position: absolute;
  z-index: 3;
  width: 12px;
  height: 12px;
  border-color: #b4fff4;
  border-style: solid;
}
.neon-gate::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}
.neon-gate::after {
  right: -1px;
  bottom: -1px;
  border-width: 0 2px 2px 0;
}
.gate-beam {
  position: absolute;
  top: -38px;
  left: -38px;
  width: 24px;
  height: 142px;
  opacity: .75;
  background: linear-gradient(90deg, transparent, rgba(216, 255, 251, .85), transparent);
  box-shadow: 0 0 18px var(--cyan);
  transform: rotate(32deg);
  animation: gate-sweep 1.7s ease-in-out infinite;
}
.gate-core {
  position: absolute;
  top: 25px;
  left: 31px;
  width: 18px;
  height: 18px;
  border: 1px solid var(--violet);
  border-radius: 3px;
  box-shadow: 0 0 10px var(--violet), inset 0 0 8px rgba(175, 108, 255, .6);
  transform: rotate(45deg);
  animation: core-breathe 1.7s ease-in-out infinite;
}
.gate-node {
  position: absolute;
  z-index: 4;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #30476e;
  box-shadow: 0 0 0 transparent;
  animation: node-light 1.7s linear infinite;
}
.node-a {
  top: 9px;
  left: 9px;
}
.node-b {
  top: 9px;
  right: 9px;
  animation-delay: .28s;
}
.node-c {
  bottom: 9px;
  right: 9px;
  animation-delay: .56s;
}
.node-d {
  bottom: 9px;
  left: 9px;
  animation-delay: .84s;
}
.gate-star {
  position: absolute;
  z-index: 1;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: #bceeff;
  box-shadow: 0 0 6px #8edcff;
  animation: star-flicker 1.8s ease-in-out infinite;
}
.star-a {
  top: 22px;
  left: 27px;
}
.star-b {
  top: 35px;
  right: 24px;
  animation-delay: .5s;
}
.star-c {
  bottom: 31px;
  left: 20px;
  animation-delay: 1s;
}
.gate-caption {
  position: absolute;
  z-index: 4;
  bottom: 12px;
  color: #83f7e5;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-shadow: 0 0 7px rgba(84, 246, 220, .7);
  animation: caption-flash 1.7s ease-in-out infinite;
}
@keyframes gate-sweep {
  0%, 16% {
    transform: translateX(-32px) rotate(32deg);
    opacity: 0;
  }
  25% {
    opacity: .9;
  }
  64% {
    opacity: .9;
  }
  78%, 100% {
    transform: translateX(142px) rotate(32deg);
    opacity: 0;
  }
}
@keyframes core-breathe {
  0%, 20%, 100% {
    transform: rotate(45deg) scale(.72);
    opacity: .38;
  }
  48% {
    transform: rotate(225deg) scale(1.12);
    opacity: 1;
  }
  70% {
    transform: rotate(300deg) scale(.9);
    opacity: .7;
  }
}
@keyframes node-light {
  0%, 12%, 100% {
    background: #30476e;
    box-shadow: none;
  }
  22%, 45% {
    background: var(--cyan);
    box-shadow: 0 0 8px var(--cyan);
  }
}
@keyframes star-flicker {
  0%, 100% {
    opacity: .2;
    transform: scale(.7);
  }
  50% {
    opacity: 1;
    transform: scale(1.5);
  }
}
@keyframes caption-flash {
  0%, 30%, 100% {
    opacity: .42;
  }
  48%, 70% {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .neon-gate-loader * {
    animation: none;
  }
  .gate-core, .gate-node {
    opacity: 1;
  }
}