/* dark glass layer + center content */
.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: radial-gradient(
      circle at 20% 20%,
      rgba(124, 240, 61, 0.06),
      transparent 30%
    ),
    radial-gradient(circle at 80% 0%, rgba(124, 240, 61, 0.04), transparent 25%),
    rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
}

/* single floating button */
.enter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1.3rem 3.4rem;

  background: var(--main-color);
  color: var(--bg-color);
  border-radius: 999px;
  border: 0.2rem solid var(--main-color);

  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;

  box-shadow: 0 1.2rem 2.6rem rgba(124, 240, 61, 0.45);
  cursor: pointer;

  /* gentle float + glow */
  animation: float-btn 3.4s ease-in-out infinite, fadeIn 0.8s ease-out forwards;
  transform-origin: center;
  text-align: center;

  /* needed for click effect */
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

/* glowing ripple overlay */
.enter-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;

  background: radial-gradient(
    circle,
    rgba(188, 255, 120, 0.6) 0%,
    rgba(188, 255, 120, 0) 70%
  );

  opacity: 0;
  transform: scale(0.2);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

/* hover: a bit more “click me” */
.enter-btn:hover {
  box-shadow: 0 1.6rem 3.2rem rgba(124, 240, 61, 0.6);
}

.enter-btn:active {
  transform: scale(0.94) translateY(2px);
  box-shadow: 0 0.6rem 1.6rem rgba(124, 240, 61, 0.4);
  animation: none;
}

.enter-btn:active::after {
  opacity: 1;
  transform: scale(1.6);
}

/* stack button + subtitle nicely */
.welcome-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* tiny label under the button */
.welcome-subtitle {
  font-size: 1.3rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.65);
}

/* keyframes */
@keyframes float-btn {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* when leaving the welcome screen */
body.welcome-leaving .overlay {
  animation: welcomeExit 0.9s ease-in forwards;
}

@keyframes welcomeExit {
  0% {
    opacity: 1;
    transform: scale(1);
    filter: blur(0);
  }
  60% {
    opacity: 0.4;
    transform: scale(1.02);
    filter: blur(4px);
  }
  100% {
    opacity: 0;
    transform: scale(1.05);
    filter: blur(8px);
  }
}

/*  media queries */
@media (max-width: 520px) {
  .enter-btn {
    font-size: 1.5rem;
    padding: 1.1rem 2.8rem;
    margin: 0 2rem;
  }
}