:root{
  --bg:#f7f7fb;
  --card:#ffffff;
  --accent:#0066ff;
  --text:#111;
  --muted:#666;
  --radius:10px;
  --container:1100px;
  --gap:1.25rem;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  line-height:1.5;
}

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:1.25rem;
}

.site-header{
  background:linear-gradient(90deg, #fff, #f9fbff);
  border-bottom:1px solid rgba(0,0,0,0.05);
  position:sticky;
  top:0;
  z-index:20;
}
.site-header .container{
  display:flex;
  align-items:center;
  gap:var(--gap);
}
.logo{
  font-weight:700;
  color:var(--accent);
  text-decoration:none;
}
.nav-toggle{
  display:none;
  background:none;
  border:0;
  font-size:1.5rem;
}
.main-nav{margin-left:auto; display:flex; gap:1rem}
.main-nav a{
  text-decoration:none;
  color:var(--text);
  padding:0.5rem 0.75rem;
  border-radius:6px;
}
.main-nav a:hover{background:rgba(0,0,0,0.03)}

.hero{
  padding:4.5rem 0;
  background:linear-gradient(180deg, rgba(0,102,255,0.06), transparent);
}
.hero-inner{max-width:850px}
.hero h1{margin:0 0 .5rem; font-size:clamp(1.5rem,3vw,2.25rem)}
.btn{
  display:inline-block;
  background:var(--accent);
  color:#fff;
  padding:0.6rem 1rem;
  border-radius:8px;
  text-decoration:none;
}

.section{padding:3rem 0}
.section.alt{background:transparent}

.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:1rem;
  margin-top:1rem;
}
.card{
  background:var(--card);
  padding:1rem;
  border-radius:var(--radius);
  box-shadow:0 6px 18px rgba(16,24,40,0.05);
}

.site-footer{
  padding:1.5rem 0;
  text-align:center;
  color:var(--muted);
  font-size:0.95rem;
}

/* Responsive */
@media (max-width:800px){
  .nav-toggle{display:inline-block; margin-left:auto}
  .main-nav{
    position:fixed;
    right:0;
    top:60px;
    background:var(--card);
    width:220px;
    transform:translateX(110%);
    transition:transform .22s ease;
    box-shadow:0 8px 30px rgba(10,20,40,0.08);
    flex-direction:column;
    padding:0.75rem;
    border-radius:10px 0 0 10px;
  }
  .main-nav.open{transform:translateX(0)}
  .main-nav a{padding:.5rem 0}
}