body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: black;
  color: white;
  font-family: Arial, sans-serif;
  transition: background-color 4s ease;
}

body.blue-bg {
  background-color: #3049ff;
}

.radar-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.radar {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.center-point {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  background-color: red;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.pulse {
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% {
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    transform: translate(-50%, -50%) scale(1.5);
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
  }
}

.circle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border: 1px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.wave {
  animation: expand 4s linear infinite;
}

.wave:nth-child(2) {
  animation-delay: 1.33s;
}

.wave:nth-child(3) {
  animation-delay: 2.66s;
}

@keyframes expand {
  0% {
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    width: 300vw;
    height: 300vw;
    opacity: 0;
  }
}

.text {
  position: absolute;
  opacity: 0;
}

.reveal {
  animation: reveal 4s forwards;
}

@keyframes reveal {
  0%, 25% { opacity: 0; }
  50%, 100% { opacity: 1; }
}

#play-button {
  position: absolute;
  top: 90%;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  background-color: #000000;
  color: #ffffff;
  border: none;
  cursor: pointer;
  font-size: 16px;
}

#play-button:hover {
  background-color: #333333;
}

  
  #play-button:hover {
    background-color: #eeeeee;
  }