body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(to bottom, #0f172a, #1e293b);
    color: #f1f5f9;
}

header {
    text-align: center;
    padding: 2rem;
    background: #1e293b;
}

nav {
    text-align: center;
    background: #0f172a;
    padding: 1rem;
}

nav a {
    color: #38bdf8;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

main {
    padding: 2rem;
    max-width: 900px;
    margin: auto;
}

.card {
    background: #1e293b;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 10px;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #0f172a;
}