:root{
  --bg:#0f1724;
  --panel:#0b1220;
  --accent:#1d9bf0;
  --text:#e6eef8;
}
*{box-sizing:border-box;font-family:Inter,UI-sans-serif,system-ui,Helvetica,Arial;}
body{
  margin:0;
  background:linear-gradient(180deg,#071025 0%, #0b1726 100%);
  color:var(--text);
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 20px;
  background:rgba(255,255,255,0.03);
  border-bottom:1px solid rgba(255,255,255,0.03);
}
header h1{margin:0;font-size:1.1rem;}
nav button{
  margin-left:8px;padding:6px 10px;border-radius:6px;border:0;background:var(--panel);color:var(--text);
  cursor:pointer;
}
main{
  display:flex;flex:1;padding:16px;gap:16px;
}
#sidebar{
  width:260px;background:rgba(255,255,255,0.02);padding:12px;border-radius:8px;
}
#game-area{flex:1;display:flex;flex-direction:column;align-items:center;gap:8px;}
canvas{
  background:linear-gradient(180deg,#0b1830 0%, #072033 100%);
  border:2px solid rgba(255,255,255,0.04);
  border-radius:6px;
  box-shadow:0 6px 30px rgba(2,8,23,0.6);
  max-width:100%;
}
#hud{width:100%;display:flex;justify-content:space-between;color:var(--accent);padding:6px 2px 0 2px}
footer{padding:8px 16px;font-size:0.85rem;opacity:0.8}
.controls-panel{font-size:0.95rem}