:root{--bg:#ffffff;--bg-subtle:#f7f8fa;--bg-elevated:#ffffff;--border:#e7e8ec;--border-strong:#d7d9df;--text:#1a1b25;--text-muted:#5c6070;--text-faint:#8a8f9e;--accent:#6d5efc;--accent-hover:#5a4ae0;--accent-soft:#efedff;--code-bg:#f4f4f7;--shadow:0 1px 2px rgba(16,18,33,0.04),0 8px 24px rgba(16,18,33,0.06);--radius:12px;--sidebar-w:290px;--topbar-h:60px;--content-max:820px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}@media (prefers-color-scheme:dark){:root{--bg:#0d0e12;--bg-subtle:#121319;--bg-elevated:#16171e;--border:#24262f;--border-strong:#30323d;--text:#ecedf1;--text-muted:#a4a9b8;--text-faint:#6f7484;--accent:#8b7dff;--accent-hover:#a094ff;--accent-soft:#1d1b34;--code-bg:#1a1c24;--shadow:0 1px 2px rgba(0,0,0,0.4),0 8px 24px 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