:root {
    --ink: #1f2430; --muted: #6b7280; --border: #e5e7eb; --primary: #2563eb;
    --code-bg: #0f172a; --code-ink: #e2e8f0; --sidebar: #f8fafc;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.gtop { display: flex; align-items: center; gap: 20px; padding: 12px 22px;
    border-bottom: 1px solid var(--border); position: sticky; top: 0; background: #fff; z-index: 10; }
.gtop .brand { font-weight: 800; font-size: 18px; color: var(--ink); }
.gtop .brand span { color: var(--primary); }
.gtop nav { display: flex; gap: 18px; margin-left: auto; }
.gtop nav a { color: var(--ink); font-size: 14px; font-weight: 500; }
.gtop .menu { display: none; background: none; border: none; font-size: 20px; cursor: pointer; margin-left: auto; }

.glayout { display: flex; align-items: flex-start; max-width: 1180px; margin: 0 auto; }
.gside { width: 240px; flex: 0 0 240px; position: sticky; top: 57px; align-self: flex-start;
    height: calc(100vh - 57px); overflow-y: auto; padding: 18px 12px; border-right: 1px solid var(--border);
    background: var(--sidebar); }
.gside-group { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted);
    font-weight: 700; margin: 14px 10px 6px; }
.gside a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--ink); font-size: 14px; }
.gside a:hover { background: #eef2f7; text-decoration: none; }
.gside a.active { background: var(--primary); color: #fff; }

.gmain { flex: 1; min-width: 0; padding: 28px 40px 80px; }

/* Rendered markdown */
.markdown { max-width: 780px; line-height: 1.65; }
.markdown h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: -.02em; }
.markdown h2 { font-size: 22px; margin: 34px 0 10px; padding-top: 10px; border-top: 1px solid var(--border); }
.markdown h3 { font-size: 17px; margin: 24px 0 8px; }
.markdown p, .markdown li { font-size: 15px; }
.markdown blockquote { margin: 14px 0; padding: 8px 16px; border-left: 3px solid var(--primary);
    background: #f1f5ff; color: #334155; border-radius: 0 8px 8px 0; }
.markdown blockquote p { margin: 4px 0; }
.markdown :not(pre) > code { background: #f1f5f9; padding: 1px 6px; border-radius: 5px; font-size: 13px; }
.markdown pre { background: var(--code-bg); color: var(--code-ink); border-radius: 10px;
    padding: 16px 18px; overflow-x: auto; font-size: 13px; line-height: 1.55; }
.markdown pre code { background: none; padding: 0; color: inherit; font-size: 13px; }
.markdown table { border-collapse: collapse; width: 100%; margin: 14px 0; display: block; overflow-x: auto; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 8px 12px; font-size: 14px; text-align: left; }
.markdown th { background: #f8fafc; }
.markdown img { max-width: 100%; }
.markdown hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }

@media (max-width: 820px) {
    html, body { overflow-x: clip; }
    .gtop .menu { display: block; }
    .gtop nav { display: none; }
    .glayout { display: block; }
    .gside { position: fixed; top: 57px; left: 0; bottom: 0; width: 260px; z-index: 20;
        transform: translateX(-100%); transition: transform .2s; height: auto; }
    .gside.open { transform: translateX(0); box-shadow: 0 10px 30px rgba(0,0,0,.15); }
    .gmain { padding: 20px 16px 60px; }
    .markdown { max-width: 100%; }
}