html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background-color: #111;
  cursor: none;
  font-family: Arial, sans-serif;
}

.circle {
  position: absolute;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background-color: #fff;
  pointer-events: auto;
  opacity: 0;
  transform: scale(0);
  transition: opacity 0.2s, transform 0.2s;
  border: 1px solid rgba(255,255,255,0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.cursor {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: red;
  pointer-events: none;
  transform: translate(-50%, -50%);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.cursor-trail {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: red;
  opacity: 0.3;
  pointer-events: none;
  transform: translate(-50%, -50%);
  transition: transform 0.08s linear, opacity 0.08s linear;
}

#combo {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: #0f0;
  font-size: 32px;
  font-weight: bold;
  pointer-events: none;
  transition: transform 0.2s, color 0.2s;
}

#combo-break {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #f00;
  text-shadow: 0 0 10px #f00;
  font-size: 48px;
  font-weight: bold;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 3;
}

.preview-circle {
  position: absolute;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: 5px solid #0f0;
  opacity: 0.5;
  pointer-events: none;
  transition: opacity 0.5s;
}

#game-container {
  position: relative;
  z-index: 2;
}

#spawn-border {
  position: absolute;
  border: 2px dashed #0ff;
  pointer-events: none;
  box-sizing: border-box;
  z-index: 1;
  background-image: url('bg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

#hitsound-btn, #botplay-btn {
  position: fixed;
  top: 20px;
  padding: 8px 12px;
  font-size: 16px;
  background-color: #222;
  color: #0f0;
  border: 2px solid #0f0;
  border-radius: 6px;
  cursor: pointer;
  z-index: 9999;
}

#hitsound-btn { right: 20px; }
#hitsound-btn:hover { background-color: #0f0; color: #111; }

#botplay-btn { right: 140px; }
#botplay-btn:hover { background-color: #0f0; color: #111; }