body {
    margin: 0;
    font-family: Arial;
    background: #0b1220;
    color: #e5e7eb;
}

header {
    padding: 30px;
    text-align: center;
    background: #111827;
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 10px;
    background: #0f172a;
}

nav a {
    color: #93c5fd;
    text-decoration: none;
}

.container {
    max-width: 900px;
    margin: auto;
    padding: 30px;
}

.card {
    background: #1e293b;
    padding: 20px;
    margin: 15px 0;
    border-radius: 10px;
}

footer {
    text-align: center;
    padding: 20px;
    font-size: 12px;
    color: #64748b;
}