*{margin:0;padding:0;box-sizing:border-box}
body{
  min-height:100vh;
  background:#4EC0CA;
  font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  display:flex;justify-content:center;align-items:center;
  overflow:hidden;
  user-select:none;-webkit-user-select:none;
}
.back-btn{
  position:fixed;top:12px;left:12px;z-index:100;
  background:rgba(255,255,255,0.85);color:#2E7D32;
  padding:7px 15px;border-radius:30px;
  text-decoration:none;font-size:14px;font-weight:600;
  box-shadow:0 4px 12px rgba(0,0,0,0.12);transition:transform .2s;
}
.back-btn:hover{transform:scale(1.06)}
.game-wrap{
  position:relative;
  width:min(400px,100vw);
  height:100vh;
}
canvas{
  width:100%;height:100%;display:block;
  touch-action:none;
}
.overlay{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(78,192,202,0.6);
  z-index:20;
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.overlay.show{opacity:1;pointer-events:auto}
.card{
  background:rgba(255,255,255,0.94);border-radius:20px;
  padding:30px 26px;text-align:center;
  box-shadow:0 8px 30px rgba(0,60,60,0.2);
  animation:pop .35s ease-out;
  max-width:300px;width:88%;
}
.card-emoji{font-size:44px;margin-bottom:6px}
.card h2{font-size:24px;color:#2E7D32;margin-bottom:8px}
.card p{color:#888;font-size:14px;line-height:1.6;margin-bottom:16px}
.card .final-score{font-size:56px;font-weight:800;color:#FF9800;margin:8px 0}
.card .best-line{font-size:14px;color:#aaa;margin-bottom:12px}
.btn-start{
  display:inline-block;padding:13px 40px;
  background:linear-gradient(135deg,#66BB6A,#43A047);
  color:#fff;border:none;border-radius:30px;
  font-size:17px;font-weight:700;cursor:pointer;
  box-shadow:0 4px 14px rgba(67,160,71,0.35);transition:transform .15s;
}
.btn-start:hover{transform:scale(1.05)}
.btn-start:active{transform:scale(0.97)}
@keyframes pop{
  0%{transform:scale(0.7);opacity:0}
  70%{transform:scale(1.05)}
  100%{transform:scale(1);opacity:1}
}

@supports(height:100dvh){.game-wrap{height:100dvh}}