/* Critical CSS for above-the-fold content */
body{font-family:system-ui,-apple-system,sans-serif;margin:0;line-height:1.6;color:#333}
header{background:#fff;border-bottom:1px solid #eee;position:sticky;top:0;z-index:100}
.site-title{font-size:1.2rem;font-weight:600;text-decoration:none;color:#333}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1rem}
nav a{text-decoration:none;color:#666;padding:0.5rem}
.intro{padding:2rem 1rem;max-width:800px;margin:0 auto}
.intro h1{font-size:2rem;margin:0 0 1rem;color:#222}
.hamburger{display:none}
@media (max-width:768px){
nav ul{display:none}
.hamburger{display:block}
}