*{box-sizing:border-box}
body{margin:0;background:#f2f4f8;font-family:Arial,sans-serif;min-height:100vh;padding:16px;color:#263238}
.container{max-width:700px;margin:auto;background:#fff;padding:22px;border-radius:14px;box-shadow:0 8px 28px rgba(0,0,0,.10)}
.home-btn{display:inline-block;text-decoration:none;background:#eef3f8;color:#1565c0;padding:8px 12px;border-radius:8px;font-weight:700;margin-bottom:8px}
h1{text-align:center;color:#1565c0;margin:5px 0 18px}
.toolbar{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;margin-bottom:12px}
.toolbar label{font-weight:700}
select,button{font:inherit;border:1px solid #ccd4dc;border-radius:8px;padding:9px 12px;background:#fff}
button{cursor:pointer;background:#1565c0;color:#fff;border:0;font-weight:700}
.level,.target{padding:9px 12px;background:#f4f7fa;border-radius:8px}
.target{text-align:center;margin:0 auto 10px;max-width:220px;font-size:16px}
.rules{background:#f7f9fb;border-radius:10px;padding:10px 12px;font-size:14px;line-height:1.45;margin-bottom:14px;text-align:center}
#board{margin:auto;display:grid;gap:3px;justify-content:center;width:max-content}
.cell{background:#fff;border:2px solid #263238;border-radius:3px}
input{width:100%;height:100%;border:0;background:transparent;text-align:center;font-size:clamp(17px,5vw,25px);font-weight:700;color:#1565c0;outline:none}
input:focus{background:#eaf3ff}
input.prefilled{color:#263238;background:#f4f6f8}
input.error{background:#ffebee;color:#c62828}
#message{text-align:center;min-height:26px;margin:14px 0;font-weight:700}
.game-info{display:flex;justify-content:center;gap:12px;align-items:center}
.game-info button{background:#455a64;padding:7px 12px}
@media(max-width:600px){
 .container{padding:14px}
 .toolbar{gap:7px}
 .toolbar>*{font-size:14px}
 .rules{font-size:12px}
}