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.lead{max-width:700px;margin-bottom:20px}.lesson-tags{display:flex;gap:16px;align-items:center;flex-wrap:wrap;font-size:.88rem;color:var(--muted)}.lesson-tags>span{display:inline-flex;align-items:center;gap:6px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:56px;padding-top:40px;padding-bottom:96px;align-items:start}.lesson-main{min-width:0;max-width:780px}.lesson-body{padding:0}.lesson-body .prose>h1:first-child{display:none}.toc{position:sticky;top:96px;font-size:.86rem}.toc-title{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:12px}.toc ol{list-style:none;margin:0 0 24px;padding:0;border-left:1px solid var(--line)}.toc a{display:block;padding:5px 0 5px 14px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);line-height:1.4;text-decoration:none;transition:color .2s,border-color .2s}.toc a:hover{color:var(--ink)}.toc a.on{color:var(--ink);border-left-color:var(--accent);font-weight:500}.toc-back{display:inline-flex;align-items:center;gap:6px;color:var(--ink-2);font-size:.84rem;padding-top:14px;border-top:1px solid var(--line);width:100%}@media(max-width:1060px){.lesson-layout{grid-template-columns:1fr}.toc{display:none}}.ex-section{margin-top:56px;padding-top:40px;border-top:1px solid var(--line);scroll-margin-top:88px}.ex-title{font-size:1.6rem;letter-spacing:-.035em;margin-bottom:22px}.lesson-end{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:48px;padding:20px 22px;border-radius:var(--radius);border:1px dashed var(--line-strong);background:#fff}.lesson-end strong{font-size:1.02rem}.lesson-end p{margin:2px 0 0;font-size:.9rem}.lesson-end>div{flex:1;min-width:220px}.lesson-end.is-done{border-style:solid;border-color:var(--accent-100);background:linear-gradient(90deg,var(--accent-50),#fff 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