body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #0f172a;
    color: #fff;
}

header {
    background: #111827;
    padding: 20px;
    text-align: center;
}

nav a {
    color: #38bdf8;
    margin: 0 10px;
    text-decoration: none;
}

.hero {
    padding: 60px;
    text-align: center;
    background: linear-gradient(45deg, #0ea5e9, #22c55e);
}

section {
    padding: 40px;
}

footer {
    text-align: center;
    padding: 20px;
    background: #111827;
}