body{margin:0;font-family:Inter,Segoe UI,sans-serif;background:#f7f7fb;color:#1b1b1f}.app{padding:16px}.header{text-align:center;margin-bottom:24px}.content{display:grid;gap:16px}.card{background:#fff;border-radius:12px;padding:16px;box-shadow:0 2px 8px #00000014}@media (min-width: 768px){.content{grid-template-columns:repeat(3,1fr)}}