:root{--bg:#f4f6f9;--card:#fff;--text:#26313d;--muted:#64707d;--accent:#1a5fb4;--accent-strong:#14477f;--accent-soft:#eaf1fb;--border:#e4e9f0;--border-strong:#d3dae4;--row-alt:#f8fafc;--todo-bg:#fff4d6;--todo-border:#e0b400;--todo-text:#7a5c00;--code-bg:#eef1f5;--shadow:0 1px 2px rgba(16,42,76,.04),0 8px 30px rgba(16,42,76,.06);--hero-from:#14477f;--hero-to:#0f3560}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0d1220;--card:#151c2b;--text:#dde3ec;--muted:#94a1b4;--accent:#6ea8ff;--accent-strong:#4d8de6;--accent-soft:#1b2942;--border:#263248;--border-strong:#33415a;--row-alt:#1a2233;--todo-bg:#3a2f10;--todo-border:#7a5c00;--todo-text:#f0d68a;--code-bg:#1e2735;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 30px rgba(0,0,0,.4);--hero-from:#10294a;--hero-to:#0a1a30}}:root[data-theme=dark]{--bg:#0d1220;--card:#151c2b;--text:#dde3ec;--muted:#94a1b4;--accent:#6ea8ff;--accent-strong:#4d8de6;--accent-soft:#1b2942;--border:#263248;--border-strong:#33415a;--row-alt:#1a2233;--todo-bg:#3a2f10;--todo-border:#7a5c00;--todo-text:#f0d68a;--code-bg:#1e2735;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 30px rgba(0,0,0,.4);--hero-from:#10294a;--hero-to:#0a1a30}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}.hero{background:linear-gradient(135deg,var(--hero-from) 0,var(--hero-to) 100%);color:#fff;padding:40px 0 44px;border-bottom:1px solid hsla(0,0%,100%,.08)}.hero__inner{max-width:1040px;margin:0 auto;padding:0 24px}.hero__brand{display:inline-flex;align-items:center;gap:7px;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;font-weight:600;color:hsla(0,0%,100%,.75);margin-bottom:14px}.hero__title{margin:0 0 14px;font-size:1.85rem;font-weight:700;line-height:1.2;letter-spacing:-.015em;max-width:22ch}.hero__meta{display:flex;flex-wrap:wrap;gap:8px 14px;font-size:.82rem;color:hsla(0,0%,100%,.85)}.hero__pill{display:inline-flex;align-items:center;gap:7px;background:hsla(0,0%,100%,.1);border:1px solid hsla(0,0%,100%,.16);padding:4px 11px;border-radius:6px}.hero__pill strong{font-weight:600}.layout{max-width:1040px;margin:-20px auto 0;padding:0 24px 80px;display:grid;grid-template-columns:236px minmax(0,720px);justify-content:center;grid-gap:44px;gap:44px;align-items:start}.sidebar{position:-webkit-sticky;position:sticky;top:24px;align-self:start;background:var(--card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:18px 14px;max-height:calc(100vh - 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