* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f5f7fa;
}

.container {
  max-width: 800px;
  width: 100%;
  margin: 20px;
  background: #ffffff;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  overflow: hidden;
  text-align: center;
}

header {
  padding: 20px;
  background: linear-gradient(135deg, #6b8cff, #88e0ef);
  color: #fff;
}

h1 {
  font-size: 2rem;
}

.game-wrapper {
  padding: 20px;
}

canvas {
  background: #e2e8f0;
  border: 2px solid #ccd6f6;
  border-radius: 8px;
  max-width: 100%;
  height: auto;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

footer {
  padding: 15px;
  font-size: 0.9rem;
  color: #555;
  background: #f1f3f5;
}