body {
    font-family: 'Segoe UI', sans-serif;
    background: #0f172a;
    color: #f8fafc;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.card {
    background: #1e293b;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid #38bdf8;
    text-align: center;
}
h1 { color: #38bdf8; margin-bottom: 0.5rem; }
p { color: #94a3b8; }