:root{--fg:#161616;--bg:#fff;--muted:#666;--link:#0b67ff}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}
.container{max-width:820px;margin:2rem auto;padding:0 1rem}
.site-header{background:#f8f8f8;border-bottom:1px solid #eee}
.site-header nav{display:flex;gap:1rem;max-width:820px;margin:0 auto;padding:.75rem 1rem;flex-wrap:wrap}
.site-header a{color:var(--link);text-decoration:none}
.site-header a:hover{text-decoration:underline}
.site-footer{max-width:820px;margin:2rem auto;padding:1rem;color:var(--muted);border-top:1px solid #eee;font-size:.9rem}
h1,h2,h3{line-height:1.25}
h1{font-size:2rem;margin:1.25rem 0 .75rem}
h2{font-size:1.5rem;margin:1rem 0 .5rem}
h3{font-size:1.25rem;margin:.75rem 0 .5rem}
p{margin:.5rem 0}
ul{padding-left:1.2rem}
a{color:var(--link)}