:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;color-scheme:light dark}body{margin:0;padding:2rem;max-width:720px;margin-inline:auto}button{cursor:pointer;padding:.4rem .8rem}input{padding:.4rem;margin-right:.5rem}.row{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}