* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #111; overflow: hidden; font-family: 'Segoe UI', Tahoma, sans-serif; }
canvas { display: block; width: 100vw; height: 100vh; }
#ui { position: fixed; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; }
#hud {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 20px; background: rgba(0,0,0,0.6);
  padding: 8px 24px; border-radius: 20px; color: #fff; font-size: 18px; font-weight: bold; z-index: 10;
}er-screen, #win-screen {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: rgba(0,0,0,0.85); color: #fff; padding: 36px 48px; border-radius: 24px;
  text-align: center; pointer-events: auto; box-shadow: 0 0 60px rgba(100,200,255,0.2); min-width: 320px;
}
#start-screen h1 { font-size: 34px; margin-bottom: 10px; }
#game-over-screen h1, #win-screen h1 { font-size: 30px; margin-bottom: 10px; }
#start-screen p, #game-over-screen p, #win-screen p { font-size: 16px; margin-bottom: 6px; color: #ccc; }
.controls-hint { background: rgba(255,255,255,0.08); border-radius: 12px; padding: 10px 16px; margin: 14px 0; font-size: 14px; color: #aaa; }
#start-btn, #restart-btn, #next-btn {
  margin-top: 16px; padding: 14px 36px; font-size: 18px; font-weight: bold;
  border: none; border-radius: 14px; cursor: pointer;
  background: linear-gradient(135deg, #43e97b, #38f9d7); color: #1a1a2e;
  transition: transform 0.15s, box-shadow 0.15s;
}
#start-btn:hover, #restart-btn:hover, #next-btn:hover { transform: scale(1.06); box-shadow: 0 0 20px rgba(67,233,123,0.5); }
.hidd
#level-display { background: rgba(255,255,255,0.12); padding: 2px 12px; border-radius: 12px; color: #aaddff; font-size: 14px; }
#powerbar {
  position: absolute; top: 52px; left: 50%; transform: translateX(-50%);
  width: 240px; height: 18px; background: rgba(0,0,0,0.5); border-radius: 10px;
  overflow: hidden; display: none; z-index: 10;
}
#powerbar-fill { height: 100%; border-radius: 10px; transition: width 0.1s; }
#powerbar-label { color: #fff; font-size: 11px; font-weight: bold; text-align: center; line-height: 18px; }
#start-screen, #game-oven { display: none !important; }