:root {
    --bg: #f4f6f8; --surface: #fff; --text: #1e293b; --muted: #64748b;
    --accent: #2563eb; --line: #e2e8f0; --header: #1e2530;
}
@media (prefers-color-scheme: dark) {
    :root { --bg: #0f172a; --surface: #1e293b; --text: #e2e8f0; --muted: #94a3b8;
            --accent: #60a5fa; --line: #334155; --header: #0b1220; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--text);
       font: 17px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif; }
.wrap { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 16px; }
main.wrap { flex: 1; }
.site-header { background: var(--header); color: #fff; padding: 14px 0; }
.site-header .wrap { display: flex; align-items: baseline; gap: 12px; }
.brand { color: #fff; font-weight: 700; text-decoration: none; font-size: 1.15em; }
.tagline { color: #94a3b8; font-size: .9em; }
main.wrap { padding-top: 28px; padding-bottom: 48px; }
h1 { font-size: 2em; line-height: 1.2; margin: 0 0 .4em; }
h2 { font-size: 1.4em; margin: 2em 0 .5em; padding-top: .4em; border-top: 1px solid var(--line); }
p, ul { margin: 0 0 1em; }
a { color: var(--accent); }
code { background: var(--line); padding: 1px 5px; border-radius: 4px; font-size: .92em; }
figure { margin: 1.2em 0 1.8em; }
figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line);
             border-radius: 8px; box-shadow: 0 2px 8px rgba(15, 23, 42, .12); background: var(--surface); }
figcaption { color: var(--muted); font-size: .88em; margin-top: 8px; text-align: center; }
.variant-switch { display: flex; gap: 8px; margin: 0 0 22px; flex-wrap: wrap; }
.variant-switch a { padding: 8px 16px; border: 1px solid var(--line); border-radius: 999px;
                    background: var(--surface); text-decoration: none; color: var(--text); }
.variant-switch a small { display: block; color: var(--muted); font-size: .78em; line-height: 1.2; }
.variant-switch a[aria-current="page"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.variant-switch a[aria-current="page"] small { color: #dbeafe; }
.crumbs { font-size: .9em; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--muted); }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
       padding: 12px 20px; margin: 0 0 1.4em; font-size: .95em; }
.toc ol { margin: 0; padding-left: 1.2em; }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.card h2 { border: 0; margin: 0 0 .3em; padding: 0; font-size: 1.25em; }
.card p { color: var(--muted); font-size: .95em; }
.card .links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.card .links a { padding: 6px 14px; border-radius: 6px; background: var(--accent); color: #fff; text-decoration: none; }
.card.soon { opacity: .7; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .85em; padding: 16px 0; }
@media (max-width: 600px) { body { font-size: 16px; } h1 { font-size: 1.6em; } }