* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  user-select: none;
}

body {
  background-color: #121212;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

#game-container {
  text-align: center;
  width: 100%;
  max-width: 600px;
  padding: 20px;
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.screen.active {
  display: flex;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  color: #aaa;
}

button {
  padding: 15px 30px;
  font-size: 1.2rem;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s;
  touch-action: manipulation;
}

button:hover {
  background-color: #0056b3;
}

button:active {
  transform: scale(0.98);
}

.circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  margin: 20px auto;
  cursor: pointer;
  transition: transform 0.1s;
  touch-action: manipulation;
}

.circle:active {
  transform: scale(0.95);
}

.circle.red {
  background-color: #dc3545;
  box-shadow: 0 0 20px rgba(220, 53, 69, 0.5);
}

.circle.green {
  background-color: #28a745;
  box-shadow: 0 0 30px rgba(40, 167, 69, 0.7);
}