html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #000;
}

/* Desktop: center canvas with flexbox */
body {
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  display: block;
}

/* Debug GUI Styles */
.debug-slider {
  width: 200px;
  z-index: 1001;
  position: relative;
}

.slider-label {
  color: #fff;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  font-weight: bold;
  background-color: rgba(0, 0, 0, 0.7);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  z-index: 1001;
  position: relative;
}

/* Keyboard Control Buttons */
.control-btn {
  position: absolute;
  background-color: rgba(255, 255, 255, 0.9);
  color: #000;
  border: 2px solid #000;
  border-radius: 8px;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  z-index: 10;
}

.player-btn {
  width: 50px;
  height: 50px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #000;
  color: #fff;
  border: 2px solid #fff;
}

.player-btn:hover {
  background-color: #222;
  transform: scale(1.05);
}

.player-btn:active {
  background-color: #444;
  transform: scale(0.95);
}

.game-control-btn {
  width: 120px;
  height: 50px;
  padding: 10px 20px;
  font-size: 18px;
  background-color: #000;
  color: #fff;
  border: 2px solid #fff;
}

.game-control-btn:hover {
  background-color: #222;
  transform: scale(1.05);
}

.game-control-btn:active {
  background-color: #444;
  transform: scale(0.95);
}

/* Mobile Settings Button */
.mobile-settings-btn {
  width: 120px;
  height: 50px;
  padding: 10px 15px;
  background-color: #000;
  color: #fff;
  border: 2px solid #fff;
  border-radius: 5px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  z-index: 1001;
  position: absolute;
}

.mobile-settings-btn:hover {
  background-color: #222;
}

/* Settings Overlay */
.settings-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: none;
}

/* Mobile: portrait mode with canvas at top */
@media (max-width: 768px) {
  html {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
  }
  
  body {
    position: fixed;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    overscroll-behavior: none;
    display: block;
  }
  
  canvas {
    display: block;
    position: relative;
    margin: 0 auto;
  }
}