body {
margin: 0;
padding: 0;
background: #f5f7fa;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
color: #2d3748;
line-height: 1.7;
}

.header {
background: #2f5d8c;
color: white;
padding: 30px 20px;
text-align: center;
}

.header h1 {
margin: 0;
font-size: 2rem;
}

.header p {
margin-top: 8px;
opacity: 0.9;
}

.nav {
background: white;
border-bottom: 1px solid #d8e1ea;
text-align: center;
padding: 15px;
}

.nav a {
color: #2f5d8c;
text-decoration: none;
font-weight: 600;
margin: 0 15px;
}

.nav a:hover {
color: #23486d;
text-decoration: underline;
}

.container {
max-width: 900px;
margin: 40px auto;
background: white;
padding: 40px;
border-radius: 12px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

h1, h2, h3 {
color: #2f5d8c;
}

.footer {
text-align: center;
padding: 30px;
color: #718096;
font-size: 0.9rem;
}

@media (max-width: 768px) {

```
.container {
    margin: 20px;
    padding: 25px;
}

.nav a {
    display: inline-block;
    margin: 8px;
}
```

}