* {
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}

canvas#game {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
}

.back-link {
  position: fixed;
  bottom: 16px;
  right: 16px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.85);
  font: bold 14px sans-serif;
  text-decoration: none;
  z-index: 10;
}

.back-link:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.6);
}

.cross-link {
  position: fixed;
  bottom: 16px;
  left: 16px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.85);
  font: bold 14px sans-serif;
  text-decoration: none;
  z-index: 10;
}

.cross-link:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.6);
}