:root{
  --bg:#ffffff; --fg:#0f1720; --muted:#6b7280; --accent:#2563eb; --card:#f8fafc;
}
:root.dark{ --bg:#0b1220; --fg:#e6eef8; --muted:#94a3b8; --accent:#60a5fa; --card:#071127 }
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial}
body{background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased}
.container{max-width:1000px;margin:0 auto;padding:2rem}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;gap:.75rem;align-items:center;text-decoration:none;color:inherit}
.avatar{width:44px;height:44px;border-radius:8px}
.name{font-weight:600}
.site-nav{display:flex;gap:1rem;align-items:center}
.site-nav a{color:var(--muted);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid transparent;font-size:1.25rem}
.theme-toggle{background:none;border:0;font-size:1.1rem}
.hero{padding:6rem 0;text-align:center}
.hero h1{font-size:2.25rem;margin:.25rem 0}
.lead{color:var(--muted);font-size:1.05rem}
.btn{display:inline-block;padding:.6rem 1rem;border-radius:8px;background:var(--accent);color:white;text-decoration:none;margin-right:.5rem}
.btn.ghost{background:transparent;border:1px solid rgba(0,0,0,.06);color:var(--fg)}
.section{padding:4rem 0}
.section.alt{background:var(--card)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.card{padding:1rem;background:transparent;border:1px solid rgba(0,0,0,.05);border-radius:8px}
.card h3{margin-top:0}
.link{color:var(--accent);text-decoration:none}
.site-footer{padding:2rem 0;text-align:center;color:var(--muted)}
@media(max-width:700px){
  .nav-toggle{display:inline-block}
  .site-nav{position:absolute;right:1rem;top:64px;flex-direction:column;background:var(--card);padding:1rem;border-radius:8px;display:none}
  .site-nav.show{display:flex}
}
/* utility */
.hidden{display:none}