:root{
  --bg:#f7f9fb;
  --card:#ffffff;
  --muted:#6b7280;
  --accent:#4f46e5;
  --accent-600:#4338ca;
  --glass: rgba(255,255,255,0.6);
  --radius:14px;
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:linear-gradient(180deg,var(--bg),#fff);
  color:#0f172a;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
}
.container{
  max-width:1100px;
  margin:0 auto;
  padding:1.25rem;
}
.site-header{
  backdrop-filter: blur(6px);
  background:transparent;
  position:sticky;
  top:0;
  z-index:50;
}
.header-inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:0.5rem 0;
}
.brand h1{
  margin:0;
  font-size:1.15rem;
  letter-spacing:0.2px;
}
.brand .tag{
  margin:0;
  font-size:0.85rem;
  color:var(--muted);
}
.nav a{ margin-left:0.6rem; text-decoration:none; }

.btn{
  display:inline-block;
  padding:0.55rem 0.9rem;
  border-radius:10px;
  font-weight:600;
  text-decoration:none;
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:hover{ transform:translateY(-3px); }
.btn-primary{
  background:linear-gradient(180deg,var(--accent),var(--accent-600));
  color:#fff;
  box-shadow: 0 6px 18px rgba(79,70,229,0.14);
}
.btn-outline{
  background:transparent;
  border:1px solid rgba(15,23,42,0.06);
  color:var(--accent-600);
}
.btn-ghost{
  background:transparent;
  color:var(--muted);
}
.large{ padding:0.9rem 1.25rem; font-size:1rem; border-radius:12px; }

.hero{
  padding:3.2rem 0;
}
.hero-inner{
  display:grid;
  grid-template-columns:1fr 360px;
  gap:2rem;
  align-items:center;
}
.hero-text h2{
  margin:0 0 0.5rem 0;
  font-size:2rem;
}
.hero-text p{ color:var(--muted); margin:0 0 1rem 0; }

.hero-visual .card{
  background:var(--card);
  border-radius:16px;
  padding:1rem;
  box-shadow: 0 12px 30px rgba(15,23,42,0.06);
}
.card-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0.45rem 0.6rem;
  border-bottom:1px solid #f3f4f6;
}
.card-row.dim{ opacity:0.8; font-size:0.92rem; border-bottom:none; }
.grade{
  background:linear-gradient(180deg,#ecfccb,#bbf7d0);
  padding:0.25rem 0.6rem;
  border-radius:8px;
  font-weight:700;
}

.features{ padding:2.6rem 0; }
.features h3{ margin-top:0; }
.grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1rem;
  margin-top:1rem;
}
.feature{
  background:var(--card);
  padding:1rem;
  border-radius:12px;
  box-shadow:0 8px 20px rgba(2,6,23,0.03);
}
.feature h4{ margin:0 0 .25rem 0; }

.cta{
  margin:2rem 0;
  text-align:center;
}

.site-footer{ padding:1.4rem 0; color:var(--muted); text-align:center; font-size:0.95rem; }

/* Responsive */
@media (max-width:900px){
  .hero-inner{ grid-template-columns:1fr; }
  .grid{ grid-template-columns:1fr; }
  .nav { display:flex; gap:.5rem; }
}