body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;margin:0;background:#f5f5f5}.app-shell{max-width:1200px;margin:0 auto;padding:16px}.card{background:#fff;border-radius:8px;padding:16px;margin-bottom:16px;box-shadow:0 2px 6px #0000000a}h1,h2,h3{font-weight:500}