:root{
  --bg:#ffffff;
  --text:#0f172a;
  --muted:#6b7280;
  --card:#f8fafc;
  --primary:#2563eb;
}

[data-theme="dark"]{
  --bg:#0b1220;
  --text:#e6eef8;
  --muted:#9aa8c0;
  --card:#0f172a;
  --primary:#60a5fa;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
.container{max-width:1000px;margin:0 auto;padding:24px}
.site-header{border-bottom:1px solid rgba(0,0,0,0.06);background:linear-gradient(90deg, transparent, rgba(0,0,0,0.02));position:sticky;top:0;backdrop-filter:blur(6px);z-index:10}
.header-inner{display:flex;align-items:center;gap:16px}
.logo{font-weight:700}
.nav{margin-left:auto;display:flex;gap:12px}
.nav a{color:var(--muted);text-decoration:none}
.btn{border:1px solid rgba(0,0,0,0.06);background:transparent;padding:8px 12px;border-radius:8px;cursor:pointer}
.icon-btn{font-size:16px}
.primary{background:linear-gradient(90deg,var(--primary),#3b82f6);color:white;border:none}
.ghost{border:1px solid rgba(0,0,0,0.08)}
.hero{padding:64px 0;text-align:left}
.hero h1{font-size:2rem;margin:0 0 12px}
.hero p{color:var(--muted);margin:0 0 20px}
.hero-actions{display:flex;gap:12px}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;padding:32px 0}
.card{background:var(--card);padding:18px;border-radius:12px;border:1px solid rgba(0,0,0,0.04)}
.site-footer{border-top:1px solid rgba(0,0,0,0.06);padding:18px;color:var(--muted)}

@media (max-width:600px){
  .header-inner{padding:8px}
  .hero h1{font-size:1.5rem}
}