body{font-family:system-ui,sans-serif;margin:0;color:#222}.demo-banner{background:#fde68a;text-align:center;padding:6px;font-size:14px}nav{display:flex;gap:16px;padding:12px 24px;border-bottom:1px solid #eee}main{max-width:900px;margin:24px auto;padding:0 16px}.grid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}.card{border:1px solid #ddd;border-radius:8px;padding:12px}.badge{display:inline-block;background:#eee;border-radius:4px;padding:2px 6px;font-size:12px;font-weight:600}.form{display:grid;gap:12px}.form label{display:grid;gap:4px}.msg-ok{color:#166534;font-weight:600}.msg-error{color:#b91c1c;font-weight:600}