body {
  margin: 0;
  padding: 0;
}
.container {
  width: 100%;
  height: 100vh;
  background: linear-gradient(to bottom, #009eff 70%, #7ad3ff 30%);
  display: flex;
  justify-content: center;
  align-items: center;
}
.game-box {
  display: flex;
  justify-content: center;
  width: 100%;
  height: 400px;
  position: relative;
}

/* Game Tutorial */
.game-tutorial {
  width: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: 400px;
  max-width: 1200px;
  overflow: hidden;
}
.game-tutorial img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Game Start */
.game-start {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: inline-block;
  cursor: pointer;
}
.game-start:hover {
  transform: translate(-50%, -50%) scale(1.1);
}

/* Game Score */
.game-score {
  gap: 6px;
  position: absolute;
  z-index: 20;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  justify-content: center;
  font-family: "Press Start 2P", cursive;
  font-size: 14px;
  background-color: #66ccff;
  color: #ffffff;
  padding: 8px 16px;
  border: 4px solid #ffffff;
  outline: 4px solid #66ccff;
  text-shadow: 2px 2px #0088ff;
  image-rendering: pixelated;
  will-change: transform;
  animation: floatScore 2s infinite ease-in-out;
  /* 게임 시작 후 디스플레이 */
  display: none;
}
.game-score p {
  margin: 0;
}
@keyframes floatScore {
  0%,
  100% {
    transform: translate(-50%, 0);
  }
  50% {
    transform: translate(-50%, -6px);
  }
}

/* Game Over */
.game-over {
  /* 게임 시작 후 디스플레이 */
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  position: absolute;
  z-index: 10;
  font-family: "Jua", sans-serif;
  background-color: #66ccff;
  border: 4px solid #ffffff;
  outline: 4px solid #66ccff;
  padding: 20px;
  text-align: center;
  image-rendering: pixelated;
  will-change: transform;
  animation: float 2s infinite ease-in-out;
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}
.game-over::before,
.game-over::after {
  content: "*";
  font-family: "Press Start 2P", cursive;
  position: absolute;
  color: #ffffff;
  font-size: 12px;
}
.game-over::before {
  top: 8px;
  left: 8px;
}
.game-over::after {
  bottom: 8px;
  right: 8px;
}

.game-over h2 {
  margin: 0;
  font-size: 24px;
  color: #ffffff;
  text-shadow: 2px 2px #0088ff;
  margin-bottom: 16px;
}
.game-over p {
  font-size: 28px;
  color: #ffffff;
  text-shadow: 2px 2px #0088ff;
}
.game-over .replay {
  padding: 8px 24px;
  background-color: #ffffff;
  border: 4px solid #0088ff;
  font-size: 18px;
  color: #0088ff;
  margin-top: 16px;
  cursor: pointer;
  transform: none;
  transition: transform 0.1s;
  image-rendering: pixelated;
}
.game-over .replay:hover {
  transform: scale(1.05);
  background-color: #f0f8ff;
}
.game-over .replay.active {
  transform: scale(0.95);
}