body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #0c1a2b;
    color: #f5f5f5;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1em;
    background: #091624;
}
.logo {
    font-size: 1.5em;
    color: #d4af37;
    font-weight: bold;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 1em;
    padding-left: 0;
}
nav ul li a {
    color: #f5f5f5;
    text-decoration: none;
}
.hero {
    padding: 2em;
    text-align: center;
    background: #0e223a;
}
.hero h1 {
    font-size: 2em;
    color: #d4af37;
}
.btn {
    background: #d4af37;
    color: #0c1a2b;
    padding: 0.8em 1.2em;
    text-decoration: none;
    display: inline-block;
    margin-top: 1em;
}
section {
    padding: 2em 1em;
}
footer {
    text-align: center;
    padding: 1em;
    background: #091624;
    font-size: 0.9em;
}
@media (min-width: 768px) {
    body.responsive {
        max-width: 960px;
        margin: 0 auto;
        font-size: 18px;
    }
    header, footer, section {
        padding: 2em 3em;
    }
    .hero h1 {
        font-size: 2.5em;
    }
    nav ul {
        gap: 2em;
    }
}