* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
    line-height: 1.6;
    padding: 0;
}
header {
    background-color: #1e293b;
    border-bottom: 1px solid #334155;
    padding: 1.25rem 2rem;
}
nav {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav .logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: #38bdf8;
    text-decoration: none;
}
nav .links a {
    color: #94a3b8;
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.95rem;
    transition: color 0.2s;
}
nav .links a:hover, nav .links a.active {
    color: #38bdf8;
}
main {
    max-width: 900px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}
h1 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    color: #f8fafc;
}
h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: #cbd5e1;
}
p {
    margin-bottom: 1.25rem;
    color: #94a3b8;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}
.card {
    background-color: #1e293b;
    border: 1px solid #334155;
    border-radius: 8px;
    padding: 1.5rem;
}
.card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: #38bdf8;
}
.card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}
footer {
    max-width: 900px;
    margin: 4rem auto 2rem;
    padding: 1.5rem;
    border-top: 1px solid #334155;
    text-align: center;
    color: #64748b;
    font-size: 0.875rem;
}