/* Reset + base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
 
body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #222;
    background: #fafafa;
}
 
main {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}