:root {
  --neon: #ffd300;
  --bg-1: #0f0b00;
  --bg-2: #2d2400;
  --bg-glow-1: rgba(255, 211, 0, 0.3);
  --bg-glow-2: rgba(255, 120, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100svh;
  display: grid;
  place-items: center;
  font-family: "Permanent Marker", system-ui, sans-serif;
  background:
    radial-gradient(circle at 20% 20%, var(--bg-glow-1), transparent 40%),
    radial-gradient(circle at 80% 80%, var(--bg-glow-2), transparent 40%),
    linear-gradient(135deg, var(--bg-1), var(--bg-2));
  transition: background 0.8s ease-in-out;
  overflow: hidden;
}

.hero {
  width: 100%;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  padding: 1rem;
}

.logo {
  margin: 0;
  text-transform: lowercase;
  text-align: center;
  line-height: 1.15;
  color: var(--neon);
  letter-spacing: 0.06em;
  font-size: clamp(3rem, 18vw, 12rem);
  text-shadow:
    0 0 8px rgba(255, 255, 255, 0.75),
    0 0 20px var(--neon),
    0 0 44px var(--neon),
    0 0 80px var(--neon);
  animation: flicker 2.5s infinite alternate;
}

@media (max-width: 768px) {
  .hero {
    padding: 1.5rem;
  }

  .logo {
    letter-spacing: 0.04em;
    font-size: clamp(3rem, 22vw, 7rem);
    text-shadow:
      0 0 6px rgba(255, 255, 255, 0.72),
      0 0 16px var(--neon),
      0 0 34px var(--neon),
      0 0 64px var(--neon);
  }
}

@media (max-width: 430px) {
  .hero {
    padding: 1rem;
  }

  .logo {
    letter-spacing: 0.02em;
    font-size: clamp(2.2rem, 24vw, 4.2rem);
    text-shadow:
      0 0 4px rgba(255, 255, 255, 0.7),
      0 0 12px var(--neon),
      0 0 22px var(--neon),
      0 0 40px var(--neon);
  }
}

.logo.flash {
  animation:
    flicker 2.5s infinite alternate,
    burst 0.2s ease-out;
}

@keyframes flicker {
  0%,
  18%,
  22%,
  25%,
  53%,
  57%,
  100% {
    opacity: 1;
  }

  20%,
  24%,
  55% {
    opacity: 0.82;
  }
}

@keyframes burst {
  0% {
    transform: scale(0.98);
    filter: brightness(1);
    text-shadow:
      0 0 10px rgba(255, 255, 255, 0.85),
      0 0 26px var(--neon),
      0 0 54px var(--neon),
      0 0 100px var(--neon);
  }

  100% {
    transform: scale(1);
    filter: brightness(1.12);
    text-shadow:
      0 0 8px rgba(255, 255, 255, 0.75),
      0 0 20px var(--neon),
      0 0 44px var(--neon),
      0 0 80px var(--neon);
  }
}