body {
  margin: 0;
  font-family: Arial, sans-serif;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  animation: backgroundShift 10s linear infinite;
  background: linear-gradient(45deg, #ff0000, #00ff00, #0000ff);
  background-size: 600% 600%;
}

@keyframes backgroundShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.loader {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background-color: rgba(0,0,0,0.8);
  z-index: 1000;
  animation: fadeOut 0.5s ease 2s forwards;
}

.loader.hidden {
  display: none;
}

@keyframes fadeOut {
  to {
    opacity: 0;
    visibility: hidden;
  }
}

.loader .spinner {
  border: 8px solid #f3f3f3;
  border-top: 8px solid #3498db;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.content.hidden {
  display: none;
}

.play-button {
  padding: 30px 60px;
  font-size: 32px;
  font-weight: bold;
  text-transform: uppercase;
  background: linear-gradient(45deg, #ff00cc, #ff9900, #ffff00, #ff00cc);
  background-size: 300% 300%;
  color: #fff;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(255,0,204,0.8), 0 0 40px rgba(255,153,0,0.8);
  text-shadow: 0 0 10px rgba(255,255,255,0.9);
  animation: buttonPulse 1.5s ease-in-out infinite,
             buttonBgShift 6s linear infinite;
  transition: transform 0.3s, box-shadow 0.3s;
}

.play-button:hover {
  transform: scale(1.15);
}

.play-button:active {
  transform: scale(1);
}

@keyframes buttonBgShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes buttonPulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 20px rgba(255,0,204,0.8), 0 0 40px rgba(255,153,0,0.8);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 0 40px rgba(255,0,204,1), 0 0 60px rgba(255,153,0,1);
  }
}