*{box-sizing:border-box;font-family:system-ui,Segoe UI,Roboto,Arial,sans-serif}
html,body{margin:0;height:100%;display:flex;align-items:center;justify-content:center;background:#aee0ff}
#game-wrap{position:relative;width:90vw;max-width:900px;height:70vh;max-height:600px;background:#87bfff;border-radius:10px;overflow:hidden}
canvas{width:100%;height:100%;display:block}
#scoreUI{position:absolute;top:10px;left:10px;font-size:18px;font-weight:bold;color:#013}
.center-btn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);padding:12px 24px;background:#0066cc;color:#fff;border-radius:8px;cursor:pointer;font-weight:700}
.overlay{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:#ffffff;box-shadow:0 4px 16px rgba(0,0,0,0.2);padding:18px 20px;border-radius:10px;text-align:center;min-width:240px}
.hidden{display:none}
#saveScore input{width:90%;padding:8px;margin:10px 0;border-radius:6px;border:1px solid #cbd5e1}
#saveScore button{margin-top:6px;padding:8px 14px;border:none;border-radius:6px;background:#0b6b3a;color:#fff;cursor:pointer}
#saveMessage{margin-top:12px;font-size:14px;color:#023047;line-height:1.4}