body{margin:0;font-family:system-ui;background:#f6f6f6}
header{background:#000;color:#fff;padding:15px}
nav a{color:#fff;margin-right:15px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;padding:20px}
.card{background:#fff;padding:15px;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,.08)}
button{padding:10px 15px;background:#000;color:#fff;border:none;border-radius:6px}