body{font-family:system-ui,sans-serif;margin:0;background:#f7f7f7;color:#111827}main{max-width:980px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}.card{background:#fff;border:1px solid #ddd;padding:16px;margin:12px 0}button,input{font:inherit;padding:10px;margin:6px}button{cursor:pointer}