:root{
  --primary:#0b5ed7;
  --primary-dark:#084298;
  --text:#1f2937;
  --muted:#6b7280;
  --bg:#f7f9fc;
  --white:#ffffff;
  --border:#e5e7eb;
  --radius:16px;
  --shadow:0 12px 30px rgba(0,0,0,.08);
  --container:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:Inter,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
}
a{text-decoration:none;color:inherit}
.container{width:min(92%,var(--container));margin:auto}

.header{
  position:sticky;
  top:0;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  z-index:1000;
}
.header .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  min-height:78px;
  gap:20px;
}
.logo{
  font-size:1.35rem;
  font-weight:800;
  color:var(--primary);
  letter-spacing:.5px;
}
nav{
  display:flex;
  gap:24px;
}
nav a{
  color:var(--muted);
  transition:.25s;
}
nav a:hover{color:var(--primary)}

.btn,
.btn-outline{
  padding:14px 24px;
  border-radius:999px;
  font-weight:700;
  transition:.25s;
  display:inline-block;
}
.btn{
  background:var(--primary);
  color:#fff;
}
.btn:hover{
  background:var(--primary-dark);
  transform:translateY(-2px);
}
.btn-outline{
  border:2px solid var(--primary);
  color:var(--primary);
}
.btn-outline:hover{
  background:var(--primary);
  color:#fff;
}

.hero{
  padding:90px 0;
  text-align:center;
}
.tag{
  display:inline-block;
  background:#eaf2ff;
  color:var(--primary);
  padding:8px 16px;
  border-radius:999px;
  font-weight:700;
  margin-bottom:20px;
}
.hero h1{
  font-size:clamp(2.2rem,5vw,4rem);
  line-height:1.1;
  margin-bottom:18px;
}
.subtitle{
  max-width:700px;
  margin:0 auto 36px;
  color:var(--muted);
  font-size:1.1rem;
}
.hero-buttons{
  display:flex;
  justify-content:center;
  gap:18px;
  flex-wrap:wrap;
}

section{
  padding:70px 0;
}
h2{
  text-align:center;
  margin-bottom:40px;
  font-size:2rem;
}

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:24px;
}

.card{
  background:#fff;
  padding:28px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  border:1px solid var(--border);
  transition:.25s;
}
.card:hover{
  transform:translateY(-6px);
}
.card h3{
  margin-bottom:14px;
  color:var(--primary);
}

ol{
  max-width:700px;
  margin:auto;
  display:grid;
  gap:18px;
  padding-left:24px;
}

details{
  max-width:850px;
  margin:16px auto;
  background:#fff;
  border:1px solid var(--border);
  border-radius:12px;
  padding:18px 22px;
}
summary{
  cursor:pointer;
  font-weight:700;
}

.cta{
  text-align:center;
  background:#eef5ff;
}
.cta h2{
  margin-bottom:24px;
}

footer{
  background:#0f172a;
  color:#cbd5e1;
  padding:50px 0;
  text-align:center;
}
footer a{
  color:#fff;
}

@media (max-width:900px){
  .header .container{
    flex-direction:column;
    padding:18px 0;
  }
  nav{
    flex-wrap:wrap;
    justify-content:center;
  }
}

@media (max-width:640px){
  .hero{
    padding:60px 0;
  }
  .hero h1{
    font-size:2.3rem;
  }
  .hero-buttons{
    flex-direction:column;
    align-items:center;
  }
  .btn,
  .btn-outline{
    width:100%;
    max-width:340px;
    text-align:center;
  }
}