:root {
    --bg: #ffffff;
    --fg: #1f2328;
    --muted: #59636e;
    --border: #d1d9e0;
    --accent: #0969da;
    --code-bg: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --fg: #e6edf3;
        --muted: #9198a1;
        --border: #3d444d;
        --accent: #4493f8;
        --code-bg: #151b23;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    display: grid;
    grid-template-columns: 16rem 1fr;
    min-height: 100vh;
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}

nav {
    padding: 1.5rem 1rem;
    border-right: 1px solid var(--border);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

nav ul { list-style: none; margin: 0; padding: 0; }
nav li { margin: 0.25rem 0; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current] { color: var(--accent); }
nav a[aria-current] { font-weight: 600; }

main {
    width: 100%;
    max-width: 52rem;
    padding: 2rem 1.5rem 4rem;
    margin: 0 auto;
    overflow-wrap: anywhere;
}

a { color: var(--accent); }
h1, h2, h3, h4 { line-height: 1.25; margin: 2rem 0 0.75rem; }
h1 { margin-top: 0; }
h2 { padding-bottom: 0.3rem; border-bottom: 1px solid var(--border); }

code { font: 0.9em ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--code-bg); padding: 0.15em 0.35em; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; padding: 1rem; overflow-x: auto; }
pre code { background: none; padding: 0; }

table { border-collapse: collapse; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--border); padding: 0.4rem 0.75rem; text-align: left; }
th { background: var(--code-bg); }

blockquote { margin: 1rem 0; padding: 0 1rem; color: var(--muted); border-left: 4px solid var(--border); }

@media (max-width: 48rem) {
    body { grid-template-columns: 1fr; }
    nav { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
}