body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

header {
    background: #0f172a;
    color: white;
    text-align: center;
    padding: 20px;
}

nav {
    background: #1e293b;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
}

.hero {
    text-align: center;
    padding: 50px;
    background: #e2e8f0;
}

.cards {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 40px;
}

.card {
    background: white;
    padding: 20px;
    width: 250px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border-radius: 10px;
}

footer {
    text-align: center;
    padding: 15px;
    background: #0f172a;
    color: white;
}