body{margin:0;font-family:Inter,Arial;background:#0f172a;color:#111}
a{text-decoration:none;color:#2563eb}
.app{min-height:100vh;background:#0f172a;padding:20px}
.card{background:#fff;border-radius:16px;padding:20px;max-width:900px;margin:auto}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:15px}
.tile{background:#f8fafc;padding:15px;border-radius:12px;text-align:center}
.btn{display:inline-block;padding:10px 15px;background:#2563eb;color:#fff;border-radius:10px}
.input{width:100%;padding:12px;margin:10px 0;border-radius:8px;border:1px solid #ddd}