:root{color-scheme:light;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}body{margin:0;background:#f4f7fb;color:#0f172a}.container{max-width:720px;margin:0 auto;padding:24px}.panel{background:#fff;border:1px solid #dbe3ef;border-radius:10px;padding:16px}