body {
    font-family: Arial, sans-serif;
    background: #0b1220;
    color: #e2e8f0;
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: auto;
    padding: 60px 20px;
}

h1, h2, h3 {
    color: #38bdf8;
}

a {
    color: #38bdf8;
    text-decoration: none;
}

.nav {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding: 20px;
    border-bottom: 1px solid #1f2937;
}

.card {
    background: #111827;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid #1f2937;
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 20px;
    background: #22c55e;
    color: #000;
    font-weight: bold;
    border-radius: 10px;
}

.btn:hover {
    background: #16a34a;
}

.center {
    text-align: center;
}