* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #0f0c29, #28234d, #0f0c29);
  color: white;
}

/* CONTENEDOR */
.container {
  width: 90%;
  max-width: 900px;
  text-align: center;
  position: relative;
}
.container::before {
  content: "";
  position: absolute;
  inset: -150px; /* 🔥 EXPANDE la luz */

  background: radial-gradient(
    circle at var(--x, 50%) var(--y, 50%),
    rgba(255, 0, 200, 0.35),
    rgba(0, 100, 255, 0.3),
    transparent 70%
  );

  opacity: 0;
  transition: opacity 0.3s ease;

  filter: blur(120px); /* 🔥 MUCHO más difuso */

  z-index: -1;
}
.container.active::before {
  opacity: 1;
}

/* TITULO */
h1 {
  margin-bottom: 20px;
  font-size: 2rem;
}

/* GRID RESPONSIVE */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
}

/* BOTÓN BASE */
button {
  position: relative;
  z-index: 1;
  padding: 15px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
  overflow: hidden;
  transition: all 0.3s ease;
}

/* BORDE ANIMADO (LA "LLANTA") */
button::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  padding: 2px;

  background: linear-gradient(90deg, #ff00cc, #3333ff, #ff00cc);
  background-size: 200% 200%;

  /* recorte para que solo sea borde */
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;

  opacity: 0;
  transition: opacity 0.3s ease;
}



/* TEXTO */
button span {
  position: relative;
  z-index: 10;
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* HOVER */
button:hover::before {
  opacity: 1;
  animation: borderMove 2s linear infinite;
}

button:hover {
  transform: translateY(-4px) scale(1.02);
}

/* ANIMACIÓN DEL BORDE (GIRO LIMPIO) */
@keyframes borderMove {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 200% 50%;
  }
}

/* TOOLTIP */
#tooltip {
  margin-top: 20px;
  font-size: 1rem;
  opacity: 0.8;
  min-height: 20px;
}

/* RESPONSIVE */
@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }

  button {
    padding: 12px;
    font-size: 0.9rem;
  }
}