body {
  margin: 0;
  padding: 0;
  background: #111;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

#display {
  width: 100vw;
  height: 100svh;
}

#game {
  width: 100%;
  height: 100%;
}

#start {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100svh;

  background: #111;
  color: #aaa;

  font-size: 2rem;
  font-weight: 500;

  border: none;
  cursor: pointer;
}

#controls-toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  z-index: 1000;

  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(20, 20, 20, 0.9);
  color: #eee;
  font: 500 0.95rem system-ui, sans-serif;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);

  opacity: 0;
  transition: opacity 180ms ease;
  pointer-events: none;
}

#controls-toast.show {
  opacity: 1;
}