:root{
  --bg:#0b0f13;
  --panel:#0f1720;
  --accent:#7bd389;
  --muted:#9aa6b2;
  --glass: rgba(255,255,255,0.03);
  --card: rgba(255,255,255,0.04);
}

*{box-sizing:border-box;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;}
html,body{height:100%;margin:0;background:linear-gradient(180deg,#05060a 0%, #071028 100%);color:#e6eef6;}
.topbar{
  display:flex;justify-content:space-between;align-items:center;padding:12px 18px;background:linear-gradient(90deg,rgba(255,255,255,0.03),transparent);
  border-bottom:1px solid rgba(255,255,255,0.03);
}
.topbar .left{display:flex;gap:18px;align-items:center;}
.level-name{font-weight:700;font-size:16px;color:var(--accent);}
.stats{display:flex;gap:12px;color:var(--muted);font-size:13px;align-items:center;}
.right button{margin-left:8px;padding:8px 12px;border-radius:8px;border:0;background:var(--card);color:#fff;cursor:pointer;}
.right button:hover{transform:translateY(-1px);}

.game-wrap{display:flex;gap:18px;padding:18px;height:calc(100vh - 74px);}
canvas{background:linear-gradient(180deg,#0b1220 0%, #071022 100%);border-radius:10px;box-shadow:0 8px 30px rgba(0,0,0,0.7);flex:1;display:block;margin:auto;}
.hud{width:320px;display:flex;flex-direction:column;gap:12px;}
.panel{background:var(--panel);padding:12px;border-radius:10px;border:1px solid rgba(255,255,255,0.03);}
.panel h3{margin:0 0 8px 0;color:var(--muted);font-weight:600;font-size:14px;}
.controls-grid{display:flex;flex-direction:column;gap:6px;align-items:center;}
.controls-grid .arrow{padding:10px 14px;border-radius:8px;background:var(--glass);border:1px solid rgba(255,255,255,0.03);cursor:pointer;color:#fff;font-weight:700;}
.controls-grid button:hover{transform:translateY(-2px);}

.overlay{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,rgba(1,3,5,0.6),rgba(3,6,10,0.7));
}
.overlay.hidden{display:none;}
.overlay-card{background:linear-gradient(180deg,rgba(255,255,255,0.02),rgba(255,255,255,0.01));padding:28px;border-radius:12px;border:1px solid rgba(255,255,255,0.04);min-width:320px;text-align:center;}
.overlay-card h2{margin:0 0 8px;color:var(--accent);}
.overlay-card p{color:var(--muted);margin:0 0 16px;}
.overlay-actions{display:flex;gap:10px;justify-content:center;align-items:center;}
.overlay-actions button{padding:8px 12px;border-radius:8px;border:0;background:var(--accent);color:#052018;cursor:pointer;}
.back-hub{color:var(--muted);text-decoration:none;padding:8px 10px;border-radius:8px;border:1px solid rgba(255,255,255,0.03);}

@media (max-width:1000px){
  .game-wrap{flex-direction:column;padding:12px;}
  .hud{width:100%;}
  canvas{width:100%;height:480px;}
}