body {
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    background: linear-gradient(120deg, #f8fafc 0%, #e0e7ef 100%);
    margin: 0;
    padding: 0;
    color: #222b3a;
}

header {
    background: #2b4a6f;
    color: #fff;
    padding: 2rem 0 1rem 0;
    text-align: center;
    box-shadow: 0 2px 8px rgba(43, 74, 111, 0.08);
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    letter-spacing: 1px;
}

nav {
    margin: 2rem auto;
    max-width: 500px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(43, 74, 111, 0.10);
    padding: 2rem 1.5rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

nav li {
    text-align: center;
}

nav a {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: #2b4a6f;
    color: #fff;
    border-radius: 6px;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 500;
    transition: background 0.2s, transform 0.2s;
    box-shadow: 0 2px 8px rgba(43, 74, 111, 0.06);
}

nav a:hover, nav a:focus {
    background: #3e6aa1;
    transform: translateY(-2px) scale(1.04);
}

@media (max-width: 600px) {
    nav {
        padding: 1rem 0.5rem;
    }
    header h1 {
        font-size: 1.5rem;
    }
    nav a {
        font-size: 1rem;
        padding: 0.5rem 1rem;
    }
}