body {
  margin: 0;
  font-family: sans-serif;
  color: #cfffff;
  text-align: center;

  background: radial-gradient(circle at center, #001a1a, #000000 70%);
  overflow-x: hidden;
  overflow-y: auto;
}

/* ⚡ RAYOS */
body::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;

  background: repeating-linear-gradient(
    90deg,
    rgba(0,255,255,0.05),
    rgba(0,255,255,0.05) 2px,
    transparent 2px,
    transparent 6px
  );

  animation: glitch 0.2s infinite;
  pointer-events: none;
}

@keyframes glitch {
  0% { transform: translate(0,0); }
  50% { transform: translate(2px,-2px); }
  100% { transform: translate(-2px,2px); }
}

/* CONTENIDO */
.contenido {
  position: relative;
  z-index: 2;

  max-width: 800px;
  margin: auto;
  padding: 100px 20px 80px;
}

/* ⚡ SIMBOLO */
.simbolo {
  font-size: 130px;
  color: #00ffff;

  animation: vibrar 0.3s infinite;

  text-shadow:
    0 0 10px #00ffff,
    0 0 20px #00ffff,
    0 0 40px #00ffff;
}

@keyframes vibrar {
  0% { transform: translate(0); }
  25% { transform: translate(2px, -2px); }
  50% { transform: translate(-2px, 2px); }
  75% { transform: translate(2px, 2px); }
  100% { transform: translate(0); }
}

/* TEXTO */
h1 {
  font-size: 46px;
  margin: 20px 0;
}

p {
  font-size: 18px;
  line-height: 1.8;
}

/* BOTON */
.volver {
  display: inline-block;
  margin-top: 40px;
  padding: 12px 25px;

  border: 1px solid #00ffff;
  color: #00ffff;
  text-decoration: none;

  transition: 0.3s;
}

.volver:hover {
  background: #00ffff;
  color: black;
  box-shadow: 0 0 25px #00ffff;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .simbolo { font-size: 85px; }
  h1 { font-size: 30px; }
  p { font-size: 16px; }
}