*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: #F0F4F8;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  overflow: hidden;
  font-family: 'Inter', sans-serif;
}
#game { display: block; touch-action: none; cursor: default; }
.back-link {
  position: fixed; top: 12px; left: 12px;
  color: rgba(0,30,60,0.55); font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 600; text-decoration: none; z-index: 10; transition: color 0.2s;
}
.back-link:hover { color: #001E3C; }