body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #000;
  transition: background 0.3s ease;
}

body.flash {
  background: radial-gradient(circle, #ff0000, #000);
}

.container {
  text-align: center;
}

h1 {
  margin-bottom: 10px;
  font-size: 28px;
}

button {
  margin: 5px;
  padding: 10px 20px;
  font-size: 16px;
  background-color: #0f0;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

canvas {
  border: 3px solid #fff;
  border-radius: 10px;
  touch-action: none;
  background: #111;
  margin-top: 10px;
}

.scoreboard {
  display: flex;
  justify-content: space-around;
  margin-bottom: 10px;
  font-size: 18px;
}