#progress-bar[data-astro-cid-jkfvkvs4]{position:fixed;top:0;left:0;height:3px;width:0;background:var(--accent);z-index:60;transition:width .1s linear}.lesson-shell[data-astro-cid-jkfvkvs4]{display:grid;grid-template-columns:250px minmax(0,1fr) 200px;gap:2.5rem;max-width:1240px;margin:0 auto;padding:1.5rem 1.25rem 3rem}.course-rail[data-astro-cid-jkfvkvs4]{position:sticky;top:4.5rem;align-self:start;max-height:calc(100vh - 5.5rem);overflow-y:auto;font-size:14px;padding-right:.5rem}.rail-lang[data-astro-cid-jkfvkvs4]{display:flex;align-items:center;gap:8px;font-weight:600;color:var(--text);text-decoration:none;margin-bottom:1rem}.rail-lang[data-astro-cid-jkfvkvs4] i[data-astro-cid-jkfvkvs4]{color:var(--accent);font-size:18px}.course-rail[data-astro-cid-jkfvkvs4] details[data-astro-cid-jkfvkvs4]{margin:.35rem 0}.course-rail[data-astro-cid-jkfvkvs4] summary[data-astro-cid-jkfvkvs4]{cursor:pointer;font-weight:500;font-size:13.5px;color:var(--text);padding:.3rem 0;list-style:none}.course-rail[data-astro-cid-jkfvkvs4] summary[data-astro-cid-jkfvkvs4]::-webkit-details-marker{display:none}.course-rail[data-astro-cid-jkfvkvs4] ul[data-astro-cid-jkfvkvs4]{list-style:none;margin:.2rem 0 .6rem;padding-left:.6rem;border-left:1px solid var(--border)}.course-rail[data-astro-cid-jkfvkvs4] li[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4]{display:block;padding:.28rem .6rem;font-size:13px;color:var(--text-2);text-decoration:none;border-radius:5px}.course-rail[data-astro-cid-jkfvkvs4] li[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4]:hover{color:var(--text);background:var(--surface)}.course-rail[data-astro-cid-jkfvkvs4] li[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4].active{color:var(--accent);font-weight:500;background:var(--tip-bg)}.lesson-main[data-astro-cid-jkfvkvs4]{min-width:0}.crumb[data-astro-cid-jkfvkvs4]{font-size:13px;color:var(--text-3);margin:0 0 .6rem}.lesson-main[data-astro-cid-jkfvkvs4] h1[data-astro-cid-jkfvkvs4]{font-size:32px;font-weight:700;line-height:1.2;margin:0 0 .75rem}.meta[data-astro-cid-jkfvkvs4]{display:flex;gap:1.1rem;font-size:13.5px;color:var(--text-2);margin:0 0 2rem;flex-wrap:wrap}.meta[data-astro-cid-jkfvkvs4] span[data-astro-cid-jkfvkvs4]{display:inline-flex;align-items:center;gap:5px}.meta[data-astro-cid-jkfvkvs4] i[data-astro-cid-jkfvkvs4]{font-size:15px}.helpful[data-astro-cid-jkfvkvs4]{display:flex;align-items:center;gap:.5rem;margin:3rem 0 1.5rem;padding-top:1.5rem;border-top:1px solid var(--border);font-size:14px;color:var(--text-2)}.helpful[data-astro-cid-jkfvkvs4] button[data-astro-cid-jkfvkvs4]{border:1px solid var(--border);background:var(--bg);color:var(--text-2);border-radius:7px;padding:.35rem .6rem;cursor:pointer}.helpful[data-astro-cid-jkfvkvs4] button[data-astro-cid-jkfvkvs4]:hover{border-color:var(--border-strong);color:var(--text)}.helpful[data-astro-cid-jkfvkvs4] button[data-astro-cid-jkfvkvs4].voted{color:var(--accent);border-color:var(--accent)}.lesson-pager[data-astro-cid-jkfvkvs4]{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1.5rem}.pager[data-astro-cid-jkfvkvs4]{border:1px solid var(--border);border-radius:10px;padding:.85rem 1rem;text-decoration:none;color:var(--text);display:flex;flex-direction:column;gap:4px}.pager[data-astro-cid-jkfvkvs4]:hover{border-color:var(--border-strong)}.pager[data-astro-cid-jkfvkvs4].next{text-align:right;align-items:flex-end}.pager[data-astro-cid-jkfvkvs4] span[data-astro-cid-jkfvkvs4]{font-size:12.5px;color:var(--text-3);display:inline-flex;align-items:center;gap:5px}.pager[data-astro-cid-jkfvkvs4] strong[data-astro-cid-jkfvkvs4]{font-size:14.5px;font-weight:500;color:var(--accent)}.toc-rail[data-astro-cid-jkfvkvs4]{position:sticky;top:4.5rem;align-self:start;font-size:13px}.toc-head[data-astro-cid-jkfvkvs4]{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--text-3);margin:0 0 .7rem}.toc-rail[data-astro-cid-jkfvkvs4] nav[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4]{display:block;color:var(--text-2);text-decoration:none;border-left:2px solid transparent;padding:.28rem 0 .28rem .7rem;margin-left:-.7rem;line-height:1.4}.toc-rail[data-astro-cid-jkfvkvs4] nav[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4]:hover{color:var(--text)}.toc-rail[data-astro-cid-jkfvkvs4] nav[data-astro-cid-jkfvkvs4] a[data-astro-cid-jkfvkvs4].active{color:var(--accent);border-left-color:var(--accent)}@media (max-width: 1080px){.lesson-shell[data-astro-cid-jkfvkvs4]{grid-template-columns:230px minmax(0,1fr)}.toc-rail[data-astro-cid-jkfvkvs4]{display:none}}@media (max-width: 800px){.lesson-shell[data-astro-cid-jkfvkvs4]{grid-template-columns:1fr}.course-rail[data-astro-cid-jkfvkvs4]{position:static;max-height:none;border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:1rem}}