@import url('https://fonts.googleapis.com/css2?family=Bruno+Ace&display=swap');

@property --glow-color {
  syntax: "<color>";
  inherits: false;
  initial-value: #ADF5FF;
}

:root {
  --gap: 0.125rem;
  --triangle-base: 3rem;
  --triangle-base-height: calc(1.733 * var(--triangle-base));
  --triangle-width: calc(var(--triangle-base) - var(--gap));
  --triangle-height: calc(var(--triangle-base-height) - var(--gap));
}

body.closed {
  margin: 0;
  background: #0D0C1D;
  overflow-x: hidden;
}

.closed-stage {
  position: relative;
  min-height: 100vh;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  background: radial-gradient(#2C666E, #161B33);
  background-size: 400% 400%;
  background-position: 100% 100%;
  animation: bg-animation 20s alternate infinite;
}

@keyframes bg-animation {
  from { background-position: 0% 0%; }
  to { background-position: 400% 400%; }
}

#glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50vw;
  height: 50vw;
  max-width: 640px;
  max-height: 640px;
  background: radial-gradient(circle closest-side, var(--glow-color), transparent);
  animation: glow-animation 5.2s ease infinite alternate;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
}

@keyframes glow-animation {
  from {
    --glow-color: #ADF5FF;
    transform: translate(-50%, -50%) scale(0.5);
  }
  to {
    --glow-color: #FF6978;
    transform: translate(-50%, -50%) scale(1) rotate(90deg);
  }
}

.triangle-container {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(var(--columns), calc(var(--triangle-base) * 2 + var(--gap)));
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

.triangle-set {
  display: inline-block;
  position: relative;
  width: calc(var(--triangle-base) * 2 + var(--gap));
  height: var(--triangle-base-height);
}

.triangle-set--offset {
  transform: translateX(calc(-1 * var(--triangle-base) - 0.5 * var(--gap)));
}

.triangle-set::before,
.triangle-set::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  top: var(--gap);
  border-right: var(--triangle-width) solid transparent;
  border-left: var(--triangle-width) solid transparent;
}

.triangle-set::before {
  left: calc(-1 * var(--triangle-base));
  border-bottom: var(--triangle-height) solid #0D0C1D;
}

.triangle-set::after {
  right: calc(var(--gap) * 2.5);
  border-top: var(--triangle-height) solid #0D0C1D;
}

.closed-content {
  position: relative;
  z-index: 3;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.75rem;
  padding: 2rem;
  text-align: center;
}

.closed-logo {
  width: min(70vw, 460px);
  height: auto;
  filter: drop-shadow(0 0 2.5rem rgba(173, 245, 255, .25));
}

.closed-tile {
  width: min(90vw, 320px);
}

@media (prefers-reduced-motion: reduce) {
  .closed-stage, #glow { animation: none; }
}