:root{
  --bg:#0b1020; --panel:#0f1724; --accent:#ffd166; --muted:#97a0b8;
}
*{box-sizing:border-box;font-family:Inter,Segoe UI,Arial,Helvetica,sans-serif}
body{margin:0;background:linear-gradient(180deg,var(--bg),#071024);color:#e6eef8;display:flex;flex-direction:column;min-height:100vh;align-items:center}
header{padding:18px;text-align:center}
h1{margin:0;font-size:20px}
.info{color:var(--muted);font-size:13px;margin-top:6px}
main{width:100%;max-width:520px;padding:12px;flex:1}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;background:var(--panel);padding:12px;border-radius:12px}
.cell{aspect-ratio:1/1;background:rgba(255,255,255,0.03);border-radius:8px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;overflow:hidden}
.planet{width:74%;height:74%;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;box-shadow:0 6px 18px rgba(2,6,23,0.6);transition:transform .18s,opacity .18s}
.lv1{background:linear-gradient(135deg,#6fe7ff,#4aa3ff);color:#012}
.lv2{background:linear-gradient(135deg,#ffd166,#ff8a00);color:#2b0100}
.lv3{background:linear-gradient(135deg,#d6b3ff,#9b5cff);color:#2b012b}
.lv4{background:linear-gradient(135deg,#b0ffd8,#35e0a6);color:#012b10}
.lv5{background:linear-gradient(135deg,#ffd1d1,#ff6b6b);color:#3b0000}
.controls{display:flex;gap:10px;align-items:center;margin-top:12px}
button{background:#16202b;border:0;color:#e6eef8;padding:10px 12px;border-radius:8px;cursor:pointer}
button:active{transform:translateY(1px)}
#score{margin-left:auto;color:var(--muted)}
.hint{color:var(--muted);font-size:12px;margin-top:8px;text-align:center}
footer{font-size:12px;color:var(--muted);padding:8px}
.small{font-size:12px;color:var(--muted)}