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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    background: #1e293b;
    border-bottom: 1px solid #334155;
    text-align: center;
    padding: 3rem 1rem;
}

header h1 {
    font-size: 2.5rem;
    color: #f8fafc;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

nav a {
    color: #38bdf8;
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
}

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

.card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    color: #f8fafc;
    margin-bottom: 0.75rem;
    border-bottom: 2px solid #38bdf8;
    display: inline-block;
    padding-bottom: 0.25rem;
}

footer {
    text-align: center;
    padding: 2rem;
    color: #64748b;
    font-size: 0.9rem;
}