.course-sidebar[data-astro-cid-afmr3pme]{position:sticky;top:4rem;align-self:start;padding:1.75rem 1.5rem;background:#fffc;border:1px solid var(--color-border);border-top:none;height:calc(100dvh - 4rem);overflow-y:auto}.sidebar-head[data-astro-cid-afmr3pme]{display:block}.back-link[data-astro-cid-afmr3pme]{display:inline-flex;align-items:center;gap:.5rem;margin-bottom:1.5rem;font-family:var(--font-mono);font-size:.75rem;font-weight:800;color:var(--color-accent-strong)}.course-toggle[data-astro-cid-afmr3pme],.back-label-short[data-astro-cid-afmr3pme]{display:none}nav[data-astro-cid-afmr3pme]{display:grid}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme]{display:grid;grid-template-columns:1.75rem 1fr auto;align-items:center;gap:.5rem;min-height:3rem;padding:.75rem 0;font-size:.75rem;font-weight:700;color:var(--color-muted);border-top:1px solid var(--color-border);line-height:1.5}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme].active{color:var(--color-accent-strong)}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme] span[data-astro-cid-afmr3pme]{font-family:var(--font-mono);font-size:.75rem;color:var(--color-muted)}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme] svg[data-astro-cid-afmr3pme]{display:none;color:var(--color-accent-strong)}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme].completed svg[data-astro-cid-afmr3pme]{display:block}@media(max-width:76rem){.course-sidebar[data-astro-cid-afmr3pme]{position:sticky;top:4rem;z-index:10;height:auto;max-height:none;padding:0;overflow:hidden;backdrop-filter:blur(1rem);width:calc(100% + 6rem);margin:0 -3rem}.sidebar-head[data-astro-cid-afmr3pme]{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:stretch;min-height:3.75rem}.back-link[data-astro-cid-afmr3pme]{justify-content:center;min-width:4.25rem;margin:0;padding-inline:1rem;border-right:1px solid var(--color-border)}.back-label[data-astro-cid-afmr3pme]{display:none}.back-label-short[data-astro-cid-afmr3pme]{display:inline}.course-toggle[data-astro-cid-afmr3pme]{display:grid;grid-template-columns:minmax(0,1fr) auto;align-content:center;align-items:center;gap:.2rem .75rem;min-width:0;padding:.65rem 1rem;color:var(--color-ink);text-align:left;background:transparent;border:0}.course-toggle[data-astro-cid-afmr3pme] span[data-astro-cid-afmr3pme],.course-toggle[data-astro-cid-afmr3pme] strong[data-astro-cid-afmr3pme]{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.course-toggle[data-astro-cid-afmr3pme] span[data-astro-cid-afmr3pme]{font-family:var(--font-mono);font-size:.7rem;font-weight:800;letter-spacing:.08em;color:var(--color-muted);text-transform:uppercase}.course-toggle[data-astro-cid-afmr3pme] strong[data-astro-cid-afmr3pme]{font-size:.95rem;line-height:1.2}.course-toggle[data-astro-cid-afmr3pme] svg[data-astro-cid-afmr3pme]{grid-row:1 / span 2;grid-column:2;color:var(--color-accent-strong);transition:transform .22s cubic-bezier(.2,.8,.2,1)}.course-sidebar[data-astro-cid-afmr3pme].is-open .course-toggle[data-astro-cid-afmr3pme] svg[data-astro-cid-afmr3pme]{transform:rotate(180deg)}.course-list-panel[data-astro-cid-afmr3pme]{max-height:18rem;overflow-y:auto;border-top:1px solid var(--color-border)}.course-sidebar[data-astro-cid-afmr3pme].is-collapsible .course-list-panel[data-astro-cid-afmr3pme]{max-height:0;overflow:hidden;border-top-color:transparent;transition:max-height .26s cubic-bezier(.2,.8,.2,1),border-color .18s ease}.course-sidebar[data-astro-cid-afmr3pme].is-collapsible.is-open .course-list-panel[data-astro-cid-afmr3pme]{max-height:min(62dvh,24rem);overflow-y:auto;border-top-color:var(--color-border)}nav[data-astro-cid-afmr3pme]{padding:0 1rem .75rem}}@media(max-width:40rem){.course-sidebar[data-astro-cid-afmr3pme]{padding:0;width:calc(100% + 2rem);margin:0 -1rem}nav[data-astro-cid-afmr3pme] a[data-astro-cid-afmr3pme]{grid-template-columns:1.5rem minmax(0,1fr) auto}}.lesson-layout[data-astro-cid-3dtja3yl]{display:grid;grid-template-columns:minmax(15rem,18rem) minmax(0,1fr);width:100%;margin-inline:auto;align-items:start}.lesson-body[data-astro-cid-3dtja3yl]{padding:5.5rem 2rem 0;grid-column:2;grid-row:1;width:100%;min-width:0}.about-wrap[data-astro-cid-3dtja3yl]{display:flex;justify-content:center;margin-top:5.75rem}.comments-wrap[data-astro-cid-3dtja3yl]{margin-top:5.75rem}.lesson-nav[data-astro-cid-3dtja3yl]{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));width:min(58.25rem,100%);margin:5.75rem auto 0;border:1px solid var(--color-border)}.lesson-nav[data-astro-cid-3dtja3yl] a[data-astro-cid-3dtja3yl]{position:relative;display:grid;min-height:7rem;padding:1.5rem;color:var(--color-text);background:#ffffffd6;border-left:1px solid var(--color-border)}.lesson-nav[data-astro-cid-3dtja3yl] a[data-astro-cid-3dtja3yl]:first-child{border-left:0}.lesson-nav[data-astro-cid-3dtja3yl] span[data-astro-cid-3dtja3yl]{font-family:var(--font-mono);font-size:.75rem;font-weight:800;letter-spacing:.08em;color:var(--color-muted);text-transform:uppercase}.lesson-nav[data-astro-cid-3dtja3yl] strong[data-astro-cid-3dtja3yl]{align-self:end;font-size:1.25rem;line-height:1.25;letter-spacing:-.04em;color:var(--color-ink)}.lesson-nav[data-astro-cid-3dtja3yl] svg[data-astro-cid-3dtja3yl]{position:absolute;right:1.25rem;bottom:1.5rem;color:var(--color-accent-strong)}.lesson-nav[data-astro-cid-3dtja3yl] .current[data-astro-cid-3dtja3yl]{border-top:3px solid var(--color-accent)}@media(max-width:76rem){.lesson-layout[data-astro-cid-3dtja3yl]{grid-template-columns:1fr;width:min(var(--site-width),100%)}.lesson-body[data-astro-cid-3dtja3yl]{grid-column:auto;grid-row:auto}}@media(max-width:40rem){.lesson-body[data-astro-cid-3dtja3yl]{padding:3.25rem 1rem 0}.lesson-nav[data-astro-cid-3dtja3yl]{grid-template-columns:1fr}.lesson-nav[data-astro-cid-3dtja3yl] a[data-astro-cid-3dtja3yl],.lesson-nav[data-astro-cid-3dtja3yl] a[data-astro-cid-3dtja3yl]:first-child{border-top:1px solid var(--color-border);border-left:0}.lesson-nav[data-astro-cid-3dtja3yl] a[data-astro-cid-3dtja3yl]:first-child{border-top:0}.comments-wrap[data-astro-cid-3dtja3yl]{margin-top:3rem}}