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

html {
    font-size: 100%;
    line-height: 1.6;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #111;
    background-color: #fff;
    max-width: 42rem;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 0.95rem;
    line-height: 1.8;
}

header a {
    color: #111;
}

main section {
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2563eb;
}

h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 0.75rem;
}

article {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

article:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

article h3 {
    margin-top: 0;
}

article p {
    font-size: 0.95rem;
}

article strong {
    font-weight: 600;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #ddd;
    font-size: 0.9rem;
    color: #666;
}

@media (max-width: 600px) {
    body {
        padding: 1.5rem 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1rem;
    }

    main section {
        margin-bottom: 2.5rem;
    }
}