:root{
  --bg:#f7f7fb;
  --card:#ffffff;
  --accent:#2b6cb0;
  --danger:#e53e3e;
  --muted:#6b7280;
}
*{box-sizing:border-box;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial}
body{margin:0;background:var(--bg);color:#111}
.container{max-width:720px;margin:18px auto;padding:16px}
h1{margin:0 0 10px;font-size:1.6rem}
.controls{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.controls label{margin-right:4px;color:var(--muted)}
.controls select, .controls button{padding:8px;border-radius:8px;border:1px solid #ddd;background:var(--card)}
.info{background:var(--card);padding:10px;border-radius:8px;margin-bottom:12px;color:var(--muted)}
.puzzle{min-height:70px;background:var(--card);padding:12px;border-radius:10px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center}
.tile{min-width:44px;min-height:44px;border-radius:8px;border:1px dashed #ccc;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:1.1rem;background:linear-gradient(#fff,#f4f6fb)}
.tile.blank{background:transparent;border:2px dashed #bbb}
.keyboard{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;justify-content:center}
.key{padding:10px 12px;border-radius:8px;border:1px solid #ddd;background:var(--card);min-width:40px;text-align:center;font-weight:600}
.actions{display:flex;gap:8px;justify-content:center;margin-top:12px}
button.primary{background:var(--accent);color:#fff;border:none;padding:10px 14px;border-radius:8px}
button.danger{background:var(--danger);color:#fff;border:none;padding:8px 12px;border-radius:8px}
.result{min-height:36px;margin-top:12px;text-align:center;font-weight:700}
footer{margin-top:18px;text-align:center;color:var(--muted);font-size:0.9rem}
@media (max-width:480px){
  .tile{min-width:40px;min-height:40px}
  .controls{flex-direction:column;align-items:stretch}
}