:root{
  --bg:#fbfbfb;
  --accent:#0b5fff;
  --text:#111827;
  --muted:#6b7280;
  --container:1100px;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,Segoe UI,system-ui,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg)}
.container{max-width:var(--container);margin:0 auto;padding:0 1rem}
.site-header{background:#fff;border-bottom:1px solid #e6e9ee}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 0}
.logo{font-weight:700;color:var(--accent);text-decoration:none;font-size:1.125rem}
.primary-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1rem}
.primary-nav a{text-decoration:none;color:var(--text);padding:0.5rem 0;display:inline-block}
.primary-nav a:hover{color:var(--accent)}
.nav-toggle{display:none;background:none;border:0;padding:0.25rem;cursor:pointer}
.nav-toggle .hamburger{width:22px;height:2px;background:var(--text);display:block;position:relative}
.nav-toggle .hamburger::after,.nav-toggle .hamburger::before{content:"";position:absolute;left:0;width:22px;height:2px;background:var(--text)}
.nav-toggle .hamburger::before{top:-6px}
.nav-toggle .hamburger::after{top:6px}
.about{padding:4rem 0}
.about h1{margin:0 0 0.5rem}
.about p{margin:0;color:var(--muted);line-height:1.6}
.site-footer{border-top:1px solid #e6e9ee;background:#fff;padding:1rem 0;margin-top:3rem}
.site-footer p{margin:0;color:var(--muted);text-align:center}

/* Responsive */
@media (max-width:800px){
  .primary-nav{position:absolute;top:64px;left:0;right:0;background:#fff;border-top:1px solid #e6e9ee;transform-origin:top;transition:transform .22s ease,opacity .22s ease;opacity:0;transform:scaleY(0);}
  .primary-nav.open{opacity:1;transform:scaleY(1)}
  .primary-nav ul{flex-direction:column;padding:0.75rem 1rem}
  .nav-toggle{display:block}
  .header-inner{position:relative}
}

/* Accessibility helpers */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}