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

html {
    font-size: 18px;
    line-height: 1.6;
}

@media screen and (max-width: 640px) {
    html {
        font-size: 14px;
        line-height: 1.3;
    }
}

body {
    margin: 0;
    padding: 2rem;
    max-width: 48rem;
    margin-inline: auto;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    color: #222;
    background: #fafafa;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
    color: #111;
}

h1 {
    font-size: 2rem;
    border-bottom: 2px solid #ddd;
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 0.4rem;
}

h3 {
    font-size: 1.25rem;
}

h4 {
    font-size: 1.1rem;
}

p {
    margin: 1rem 0;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid #0066cc;
    background: #f0f4f8;
    color: #333;
}

blockquote p {
    margin: 0;
}

hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 2rem 0;
}

ul, ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

li {
    margin: 0.5rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background: #f0f0f0;
    font-weight: 600;
}

tr:hover {
    background: #f8f8f8;
}

pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1rem 1.25rem;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
}

code {
    font-family: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.9em;
}

:not(pre) > code {
    background: #eee;
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

strong {
    font-weight: 600;
}

img {
    max-width: 100%;
    height: auto;
}

div[align="center"] {
    text-align: center;
    margin-top: 2rem;
}