body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: #0f172a; /* dark slate */
  color: #e5e7eb;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.container {
  background: #020617;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  max-width: 400px;
  width: 100%;
}

button {
  background: #1e293b;
  color: #e5e7eb;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  margin: 10px;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.2s ease;
}

button:hover {
  background: #334155;
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#results {
  margin-top: 20px;
  padding: 15px;
  background: #020617;
  border-radius: 8px;
  border: 1px solid #1e293b;
}

#roundResult {
  margin-bottom: 10px;
}

#winner {
  margin-top: 10px;
  font-weight: bold;
  font-size: 18px;
}