body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  background-color: #0b0c1c;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.sequence-container {
  text-align: center;
  width: 90%;
  max-width: 900px;
}

h1 {
  font-size: 2em;
  margin-bottom: 10px;
}

#level-display {
  font-size: 1.2em;
  margin-bottom: 20px;
}

.sequence-line {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.symbol {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5em;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 5px #000;
}

.symbol.glow {
  box-shadow: 0 0 20px #ff0, 0 0 40px #ff0, 0 0 60px #ff0;
  transform: scale(1.2);
}

.controls button {
  margin: 5px;
  padding: 8px 15px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: #222;
  color: #fff;
  transition: 0.2s;
}

.controls button:hover {
  background-color: #ff0;
  color: #000;
}

#message {
  margin-top: 15px;
  font-size: 1.2em;
}