.lesson-content{--accent:#18aebc;--accent-hi:#087f91;--accent-deep:#07586c;--accent-soft:#e0f3f5;--accent-line:#91c9d1;--accent-2:#b9842f;--primary:#082f3d;--primary-hover:#0d4658;--primary-fg:#f2fbfc;--nav-bg:#06141b;--nav-bg-2:#0a202b;--nav-line:#70cde43d;--paper:#f5f8f7;--paper-2:#fff;--paper-3:#e5eeee;--bg-0:#f5f8f7;--bg-1:#fff;--bg-2:#edf3f2;--bg-3:#dce9e8;--line:#d7e3e1;--line-strong:#a6c7cd;--ink:#111827;--ink-2:#374151;--ink-3:#687386;--ink-muted:#94a0b3;--fg:#111827;--fg-muted:#374151;--fg-subtle:#687386;--fg-invert:#f7f8fc;--success:#4f6b3a;--success-soft:color-mix(in oklab, #4f6b3a 10%, var(--paper-2));--warn:#a06410;--warn-soft:color-mix(in oklab, #a06410 10%, var(--paper-2));--danger:#8a3a25;--danger-soft:color-mix(in oklab, #8a3a25 10%, var(--paper-2));--info:#008eb0;--info-soft:color-mix(in oklab, #008eb0 8%, var(--paper-2));--info-line:color-mix(in oklab, #008eb0 40%, var(--line));--code-bg:#06202b;--code-bg-head:#082f3f;--code-line:#144d62;--code-fg:#eef4ff;--code-muted:#9fc7d4;--cyan:var(--accent);--cyan-hi:var(--accent-hi);--cyan-dim:var(--accent-line);--brand-cyan:var(--accent);--selection:color-mix(in oklab, var(--accent) 30%, transparent);--ring:color-mix(in oklab, var(--accent) 55%, transparent);--font-sans:"QU Proxima", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-display:"QU Proxima", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono:"SF Mono", "Cascadia Code", Menlo, Consolas, ui-monospace, monospace;--sidebar-w:280px;--rail-w:240px;--content-w:680px;--reading-col:62ch;--header-h:56px;--shadow-soft:0 1px 0 #fff6 inset, 0 14px 40px -28px #14182c47;--radius-sm:4px;--radius:8px;--radius-md:12px;--radius-lg:16px;--radius-pill:999px;--gap-section:clamp(3rem, 4vw, 5rem);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}.dark 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5rem);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.lesson-content{width:100%;min-width:0;max-width:760px;font-family:var(--font-sans);color:var(--fg);padding:24px 0 96px}.lesson-content a{color:var(--accent-hi);border-bottom:1px solid color-mix(in oklab, var(--accent) 40%, transparent);text-decoration:none}.lesson-content a:hover{color:var(--accent);border-bottom-color:var(--accent)}.lesson-content{max-width:calc(var(--content-w) + 96px);z-index:2;width:100%;min-width:0;margin:0 auto;padding:56px 48px 120px;position:relative}.lesson-content>*{max-width:var(--content-w);box-sizing:border-box;width:100%}.lesson-content p,.lesson-content li{max-width:64ch}.lesson-content h1,.lesson-content h2,.lesson-content h3,.lesson-content h4{color:var(--fg);font-family:var(--font-display);letter-spacing:0;scroll-margin-top:calc(var(--header-h) + 24px);font-weight:600}.lesson-content h1{letter-spacing:0;margin:0 0 18px;font-size:2.35rem;line-height:1.08}.lesson-content h2{margin:64px 0 18px;font-size:1.625rem;line-height:1.22}.lesson-content h3{margin:36px 0 12px;font-size:1.125rem;line-height:1.34}.lesson-content h4{letter-spacing:0;margin:26px 0 8px;font-size:1rem;line-height:1.45}.lesson-content p{color:var(--fg);text-wrap:pretty;margin:0 0 18px}.lesson-content p.lede{color:var(--fg-muted);max-width:58ch;margin-bottom:36px;font-size:1.0625rem;line-height:1.72}.lesson-content strong{color:var(--fg);font-weight:600}.lesson-content em{color:var(--fg);font-style:italic}.lesson-content ul,.lesson-content ol{margin:0 0 20px;padding-left:22px}.lesson-content li{margin:8px 0}.lesson-content ul li::marker{color:var(--accent)}.lesson-content :not(pre)>code{font-family:var(--font-mono);background:var(--bg-2);color:var(--accent-deep);border:1px solid var(--line);overflow-wrap:anywhere;word-break:break-word;border-radius:4px;padding:1px 6px;font-size:.88em}.lesson-content kbd{font-family:var(--font-mono);color:var(--fg);background:var(--bg-2);border:1px solid 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