*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 640px;
    padding: 2rem;
    text-align: center;
}

.banner {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    font-weight: 500;
    font-size: 1.1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #94a3b8;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    text-align: left;
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: #f1f5f9;
}

.card p {
    color: #cbd5e1;
    line-height: 1.6;
}

.card ul {
    list-style: none;
    padding: 0;
}

.card ul li {
    padding: 0.4rem 0;
    color: #cbd5e1;
}

.card ul li::before {
    content: "\2713";
    color: #22c55e;
    font-weight: bold;
    margin-right: 0.5rem;
}

.meta {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: #64748b;
}

code {
    background: #0f172a;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #a78bfa;
}

footer {
    margin-top: 2rem;
    color: #475569;
    font-size: 0.875rem;
}