/* AS Notes Documentation — Layout & Theme */

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

html,
body {
    margin: 0;
    padding: 0;
}

body {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: #ffffff;
    color: #24292f;
}

/* ── Sidebar nav ───────────────────────────────────────────── */

.site-nav {
    background: #f6f8fa;
    border-right: 1px solid #d0d7de;
    padding: 1.5rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav ul li {
    margin: 0.2rem 0;
}

.site-nav ul li a {
    display: block;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    text-decoration: none;
    color: #24292f;
    font-size: 0.875rem;
    line-height: 1.4;
}

.site-nav ul li a:hover {
    background: #eaeef2;
    color: #0550ae;
}

.site-nav ul li.nav-current a {
    background: #ddf4ff;
    color: #0550ae;
    font-weight: 600;
}

/* ── Content ──────────────────────────────────────────────── */

article.markdown-body {
    padding: 2rem 3rem;
    max-width: 900px;
    overflow-x: auto;
}

/* ── Missing page ─────────────────────────────────────────── */

.missing-page {
    color: #9e9e9e;
    font-style: italic;
}

/* ── Responsive ───────────────────────────────────────────── */

@media (max-width: 700px) {
    body {
        grid-template-columns: 1fr;
    }

    .site-nav {
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 1px solid #d0d7de;
    }

    article.markdown-body {
        padding: 1.5rem;
    }
}

/* ── Dark mode ────────────────────────────────────────────── */

@media (prefers-color-scheme: dark) {
    body {
        background: #0d1117;
        color: #e6edf3;
    }

    .site-nav {
        background: #161b22;
        border-right-color: #30363d;
    }

    .site-nav ul li a {
        color: #c9d1d9;
    }

    .site-nav ul li a:hover {
        background: #21262d;
        color: #58a6ff;
    }

    .site-nav ul li.nav-current a {
        background: #1c2d3e;
        color: #58a6ff;
    }

    .missing-page {
        color: #6e7681;
    }
}