* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: linear-gradient(to bottom, #87ceeb 0%, #5c94fc 100%);
  font-family: 'Courier New', monospace;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

#gameContainer {
  position: relative;
  border: 4px solid #000;
  background-color: #5c94fc;
  border-radius: 8px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

#hud {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 40px;
  background: linear-gradient(to bottom, #000 0%, #333 100%);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  font-size: 11px;
  font-weight: bold;
  z-index: 10;
  border-bottom: 2px solid #666;
  text-shadow: 1px 1px 0px #000;
}

#hud > div {
  text-align: center;
  line-height: 1.2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#hud span {
  color: #ffd700;
  font-size: 12px;
  text-shadow: 1px 1px 0px #b8860b;
}

#score {
  color: #ff6b6b;
}

#coins {
  color: #ffd700;
  display: flex;
  align-items: center;
  gap: 4px;
}

#world {
  color: #87ceeb;
}

#time {
  color: #98fb98;
}

#lives {
  color: #ffa500;
  display: flex;
  align-items: center;
  gap: 4px;
}

#gameCanvas {
  display: block;
  margin-top: 40px;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

#startScreen,
#gameOverScreen {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: white;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.9) 0%, rgba(50, 50, 50, 0.9) 100%);
  padding: 30px;
  border-radius: 15px;
  border: 3px solid #ffd700;
  z-index: 100;
  box-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
}

#startScreen h1 {
  font-size: 28px;
  margin-bottom: 15px;
  color: #ff6b6b;
  text-shadow: 2px 2px 4px #000;
  letter-spacing: 2px;
}

#startScreen h2,
#gameOverScreen h2 {
  font-size: 20px;
  margin-bottom: 15px;
  color: #87ceeb;
  text-shadow: 1px 1px 2px #000;
}

#startScreen p,
#gameOverScreen p {
  font-size: 16px;
  margin-bottom: 15px;
  color: #ffd700;
  text-shadow: 1px 1px 2px #000;
}

.controls {
  margin-top: 25px;
  font-size: 14px;
  background: rgba(0, 0, 0, 0.5);
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #666;
}

.controls p {
  margin: 8px 0;
  color: #fff;
}

.controls p:first-child {
  color: #ffd700;
  font-weight: bold;
  margin-bottom: 12px;
}

.hidden {
  display: none !important;
}

/* ピクセルパーフェクトなスタイリング */
canvas {
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

/* モバイル対応 */
@media (max-width: 768px) {
  #gameContainer {
    transform: scale(0.8);
    border-radius: 6px;
  }

  #hud {
    font-size: 9px;
    height: 35px;
    padding: 0 15px;
  }

  #hud span {
    font-size: 10px;
  }

  #startScreen h1 {
    font-size: 22px;
  }

  #startScreen h2,
  #gameOverScreen h2 {
    font-size: 16px;
  }

  .controls {
    font-size: 12px;
    padding: 12px;
  }
}

@media (max-width: 480px) {
  #gameContainer {
    transform: scale(0.6);
    border-radius: 4px;
  }

  #hud {
    font-size: 8px;
    height: 32px;
    padding: 0 12px;
  }

  #hud span {
    font-size: 9px;
  }

  #startScreen h1 {
    font-size: 18px;
  }

  #startScreen h2,
  #gameOverScreen h2 {
    font-size: 14px;
  }

  .controls {
    font-size: 11px;
    padding: 10px;
  }
}