:root{color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}a{color:inherit;text-decoration:none}.btn{border:1px solid #ddd;background:#fff;padding:8px 12px;border-radius:10px;cursor:pointer}.card{border:1px solid #eee;border-radius:14px;padding:16px;background:#fff}