body {
  margin: 0;
  overflow: hidden;
}

canvas {
  display: block;
}

#score,
#highscore {
  position: fixed;
  left: 10px;
  color: white;
  font-family: sans-serif;
  user-select: none;
  z-index: 10;
}

#score {
  top: 10px;
  font-size: 20px;
}

#highscore {
  top: 35px;
  font-size: 16px;
}

#nextPieceContainer {
  position: fixed;
  top: 10px;
  right: 10px;
  width: 150px;
  height: 150px;
  background: #222;
  border: 2px solid #555;
  z-index: 10;
}

/* Controls (help, pause, mute, options) */
#controls {
  position: fixed;
  top: 170px;
  right: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 10;
}

.icon {
  width: 40px;
  height: 40px;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: 2px solid #555;
  border-radius: 50%;
  text-align: center;
  line-height: 40px;
  font-size: 20px;
  cursor: pointer;
  user-select: none;
}

/* On-screen rotate buttons */
.rotate-button {
  position: fixed;
  bottom: 20px;
  width: 50px;
  height: 50px;
  background: linear-gradient(45deg, rgba(0, 255, 255, 0.2), rgba(255, 255, 255, 0.2));
  border: 1px solid rgba(0, 255, 255, 0.4);
  border-radius: 50%;
  font-size: 24px;
  color: #ffffff;
  text-align: center;
  line-height: 50px;
  cursor: pointer;
  user-select: none;
  box-shadow: 0 0 6px rgba(0, 255, 255, 0.3);
  z-index: 20;
  transition: background 0.2s, border 0.2s, box-shadow 0.2s;
}

.rotate-button:hover {
  background: linear-gradient(45deg, rgba(0, 255, 255, 0.3), rgba(255, 255, 255, 0.3));
  border: 1px solid rgba(0, 255, 255, 0.6);
  box-shadow: 0 0 8px rgba(0, 255, 255, 0.5);
}

/* Positioning for left and right buttons */
#rotateLeftButton {
  left: 50%;
  transform: translateX(50%);
}

#rotateRightButton {
  right: 50%;
  transform: translateX(-50%);
}

/* Help and Options popups */
.popup {
  display: none;
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
}

.popup-content {
  background-color: #fefefe;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  max-width: 400px;
  font-family: sans-serif;
  color: #333;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
}