```css
*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Segoe UI, sans-serif;
}

body{
background:#f4f7fb;
color:#333;
}

header{
background:#0d47a1;
color:white;
text-align:center;
padding:25px;
}

.hero{
text-align:center;
padding:40px 20px;
}

.hero h2{
margin-bottom:10px;
}

.cards{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
gap:20px;
padding:20px;
max-width:1200px;
margin:auto;
}

.card{
background:white;
text-decoration:none;
color:#333;
padding:25px;
border-radius:15px;
box-shadow:0 4px 12px rgba(0,0,0,0.1);
transition:0.3s;
}

.card:hover{
transform:translateY(-8px);
}

.card h3{
margin-bottom:10px;
color:#0d47a1;
}

.content-box{
background:white;
max-width:1100px;
margin:30px auto;
padding:30px;
border-radius:15px;
box-shadow:0 3px 10px rgba(0,0,0,0.1);
}

.content-box h2{
margin-bottom:15px;
color:#0d47a1;
}

.content-box p{
line-height:1.8;
margin-bottom:15px;
}

pre{
background:#eef4ff;
padding:20px;
border-left:5px solid #0d47a1;
overflow:auto;
font-size:16px;
margin-bottom:15px;
}

footer{
background:#0d47a1;
color:white;
text-align:center;
padding:20px;
margin-top:40px;
}
```