* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #0f0f0f;
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  text-align: center;
  padding: 20px;
}

.container {
  background-color: #1c1c1c;
  border-radius: 12px;
  padding: 30px;
  max-width: 600px;
  width: 100%;
  box-shadow: 0 0 20px rgba(0, 255, 170, 0.2);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: #00ffa1;
}

h2 {
  margin-top: 25px;
  font-size: 1.8rem;
  color: #ffd700;
}

.instructions ul {
  list-style: none;
  margin: 10px 0;
  padding-left: 0;
}

.instructions li {
  margin: 8px 0;
  font-size: 1rem;
}

kbd {
  background-color: #333;
  padding: 5px 10px;
  border-radius: 5px;
  font-weight: bold;
  border: 1px solid #777;
  font-family: monospace;
}

.scoreboard, .result {
  margin-top: 20px;
}

#playerScore, #computerScore {
  font-weight: bold;
  color: #00ff99;
  font-size: 1.2rem;
}

#resultText {
  font-size: 1.2rem;
  color: #ffcc00;
  margin-top: 10px;
}

.back-button {
  margin-top: 30px;
  padding: 10px 20px;
  font-size: 1rem;
  font-weight: bold;
  background-color: #00ffa1;
  color: #0f0f0f;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.back-button:hover {
  background-color: #00cc82;
}