*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;background:#2b7a2b;color:#fff}
#container{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center}
canvas#game{display:block;background:transparent;border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,0.35)}
#ui{position:absolute;inset:0;pointer-events:none}
.overlay{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,0.55);padding:18px;border-radius:8px;text-align:center;pointer-events:auto}
.overlay.hidden{display:none}
.buttons{display:flex;gap:12px;justify-content:center;margin-top:8px}
button{padding:10px 16px;border:0;border-radius:6px;background:#ffffff;color:#111;font-weight:600;cursor:pointer}
button:active{transform:translateY(1px)}
.hint{margin-top:8px;font-size:13px;color:#ddd}
.court-options{display:flex;gap:10px;justify-content:center;margin-top:8px}
.court-option{width:34px;height:34px;border-radius:50%;border:3px solid transparent;cursor:pointer;box-shadow:0 2px 6px rgba(0,0,0,0.25);transition:transform .08s ease,box-shadow .12s ease}
.court-option:hover{transform:translateY(-2px)}
.court-option.selected{outline:3px solid rgba(255,255,255,0.12);box-shadow:0 6px 18px rgba(0,0,0,0.35);border-color:rgba(255,255,255,0.95)}
.court-label{display:block;font-size:12px;color:#ddd;margin-top:6px}
#message #resultText{font-size:20px;margin-bottom:12px;color:#fff}
.messageButtons{display:flex;gap:12px;justify-content:center}

/* small responsive tweak */
@media (max-width:480px){
  .overlay{width:92%}
  button{flex:1}
}