html,body{height:100%;margin:0;background:linear-gradient(#87CEEB,#bfe9ff);font-family:Arial,sans-serif;}
#game-container{width:100%;height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
canvas{max-width:100%;height:auto;display:block;margin:0 auto;box-shadow:0 6px 18px rgba(0,0,0,0.12);border-radius:6px;}
.hud{position:absolute;left:12px;top:12px;background:rgba(255,255,255,0.8);padding:8px 12px;border-radius:6px;z-index:20;}
.center{position:absolute;left:50%;top:8px;transform:translateX(-50%);z-index:20;color:#021;}