body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
    color: #111;
    background: #fff;
}

/* Layout */
header, main, footer {
    max-width: 800px;
    margin: auto;
    padding: 1.5rem;
}

header {
    border-bottom: 1px solid #ccc;
}

footer {
    border-top: 1px solid #ccc;
    font-size: 0.9rem;
    color: #555;
}

h1 {
    margin-bottom: 0.2rem;
}

.subtitle {
    margin-top: 0;
    color: #555;
}

h2 {
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.2rem;
    margin-top: 2rem;
}

h3 {
    margin-bottom: 0.2rem;
}

nav {
    margin-top: 1rem;
}

nav a {
    margin-right: 1rem;
    text-decoration: none;
    color: #003366;
}

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

article {
    margin-bottom: 1.5rem;
}

ul {
    margin-top: 0.5rem;
}

a {
    color: #003366;
}

a:hover {
    text-decoration: underline;
}