*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#4CAF50;
  --primary-light:#81C784;
  --secondary:#FF9800;
  --bg-top:#E8F5E9;
  --bg-bot:#FFF8E1;
  --card-bg:rgba(255,255,255,0.93);
  --radius:18px;
  --shadow:0 8px 28px rgba(60,120,60,0.15);
}
body{
  min-height:100vh;
  background:linear-gradient(180deg,#87CEEB 0%,#B2EBF2 40%,var(--bg-top) 100%);
  font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  display:flex;flex-direction:column;align-items:center;
  overflow:hidden;
  user-select:none;-webkit-user-select:none;
}
.back-btn{
  position:fixed;top:12px;left:12px;z-index:100;
  background:var(--card-bg);color:#2E7D32;
  padding:8px 16px;border-radius:30px;
  text-decoration:none;font-size:14px;font-weight:600;
  box-shadow:var(--shadow);transition:transform .2s;
}
.back-btn:hover{transform:scale(1.06)}
.game-wrap{
  position:relative;
  width:min(420px,100vw);
  height:100vh;
  display:flex;flex-direction:column;
}
.hud{
  display:flex;justify-content:space-around;
  padding:10px 8px;
  background:rgba(255,255,255,0.7);
  backdrop-filter:blur(6px);
  flex-shrink:0;
}
.hud-item{display:flex;flex-direction:column;align-items:center}
.hud .label{font-size:12px;color:#999;font-weight:600}
.hud .val{font-size:22px;font-weight:800;color:#2E7D32}
#score{color:var(--secondary)}
#lives{font-size:18px;letter-spacing:2px}
canvas{
  flex:1;width:100%;display:block;
  touch-action:none;
}
.overlay{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(232,245,233,0.85);
  z-index:20;
  opacity:0;pointer-events:none;
  transition:opacity .3s;
}
.overlay.show{opacity:1;pointer-events:auto}
.card{
  background:var(--card-bg);
  border-radius:var(--radius);
  padding:32px 28px;text-align:center;
  box-shadow:var(--shadow);
  animation:pop .35s ease-out;
  max-width:320px;width:88%;
}
.card-emoji{font-size:44px;margin-bottom:8px}
.card h2{font-size:26px;color:#2E7D32;margin-bottom:8px}
.card p{color:#888;font-size:15px;line-height:1.6;margin-bottom:16px}
.card .final-score{font-size:52px;font-weight:800;color:var(--secondary);margin:8px 0}
.card .best-line{font-size:14px;color:#aaa;margin-bottom:12px}
.btn-start{
  display:inline-block;
  padding:14px 44px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff;border:none;border-radius:30px;
  font-size:18px;font-weight:700;cursor:pointer;
  box-shadow:0 4px 14px rgba(76,175,80,0.35);
  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}}