:root{--fg:#111;--bg:#fff;--accent:#111}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--fg);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}main{max-width:72rem;margin:0 auto;padding:1rem}img{max-width:100%;height:auto}a{color:var(--accent)}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}a[role=button],button{min-height:44px}