*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#4FC3F7;
  --primary-deep:#0288D1;
  --secondary:#FFD54F;
  --danger:#FF5252;
  --bg-top:#0D1B2A;
  --bg-bot:#1B2838;
  --card-bg:rgba(255,255,255,0.93);
  --radius:18px;
  --shadow:0 8px 28px rgba(0,40,80,0.25);
}
body{
  min-height:100vh;
  background:linear-gradient(180deg,var(--bg-top),var(--bg-bot));
  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:rgba(255,255,255,0.15);color:#fff;
  padding:8px 16px;border-radius:30px;
  text-decoration:none;font-size:14px;font-weight:600;
  backdrop-filter:blur(8px);
  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(255,255,255,0.08);
  backdrop-filter:blur(6px);
  flex-shrink:0;
}
.hud-item{display:flex;flex-direction:column;align-items:center}
.hud .label{font-size:12px;color:rgba(255,255,255,0.5);font-weight:600}
.hud .val{font-size:22px;font-weight:800;color:#fff}
#score{color:var(--secondary)}
#lives{font-size:18px;letter-spacing:2px}
#best{color:var(--primary)}
canvas{
  flex:1;
  width:100%;
  display:block;
  touch-action:none;
}
/* Overlay */
.overlay{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(13,27,42,0.8);
  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:48px;margin-bottom:8px}
.card h2{font-size:26px;color:#1B2838;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(--primary-deep);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-deep));
  color:#fff;border:none;border-radius:30px;
  font-size:18px;font-weight:700;cursor:pointer;
  box-shadow:0 4px 14px rgba(2,136,209,0.4);
  transition:transform .15s,box-shadow .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}}