:root{
  --bg1:#02041a;
  --bg2:#00121a;
  --accent:#00f0e0;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,Arial,Helvetica;background:linear-gradient(180deg,var(--bg1),var(--bg2));color:#eaf6ff;overflow:hidden}
#ui{max-width:980px;margin:0 auto;padding:8px;position:relative;height:100vh}
.screen{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
#startScreen h1{font-size:42px;margin:0}
.buttons{margin-top:20px;display:flex;gap:12px}
button{padding:10px 16px;border-radius:8px;border:none;cursor:pointer;background:var(--accent);color:#022;font-weight:700}
canvas{display:block;margin: 20px auto;border-radius:8px;box-shadow:0 12px 30px rgba(0,0,0,0.6)}
.hidden{display:none}
#overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.5)}
.panel{background:linear-gradient(180deg,rgba(255,255,255,0.03),rgba(0,0,0,0.4));padding:16px;border-radius:12px;border:1px solid rgba(255,255,255,0.04);text-align:center}
#storePanel{position:absolute;right:12px;top:80px;width:260px;background:rgba(255,255,255,0.02);padding:12px;border-radius:10px;border:1px solid rgba(255,255,255,0.04)}
#gameCanvas {
    display: block !important;
    height: 650px !important;
}
.store-item{display:flex;justify-content:space-between;align-items:center;padding:8px;margin-bottom:8px;background:rgba(255,255,255,0.02);border-radius:8px}
.store-item button{padding:6px 8px;background:#ffd;border-radius:6px;border:none}
footer{position:fixed;left:8px;bottom:8px;opacity:0.85;font-size:12px}
@media (max-width:520px){
  canvas{width:92vw;height:(92 * 640 / 420)vw}
  #storePanel{left:8px;right:auto;width:80vw}
}