:root{color-scheme:light dark}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Helvetica Neue,Arial}.input{width:100%;padding:.6rem .7rem;border:1px solid #ccc;border-radius:.6rem}.label{display:block;margin-bottom:.25rem;font-weight:600}.btn{padding:.6rem .9rem;border:1px solid #999;border-radius:.6rem;background:#eee;cursor:pointer}.btn-primary{background:#2563eb;color:#fff;border-color:#1d4ed8}