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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #121826, #050711);
  color: #f9fafb;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 1rem;
}

header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

header p {
  font-size: 0.95rem;
  opacity: 0.85;
}

#game-container {
  margin-top: 1rem;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.6);
}