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9px;border-radius:999px;cursor:pointer}.speed--active{background:var(--brand);color:var(--brand-ink)}.lesson{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(260px,1fr);gap:clamp(24px,4vw,48px);padding:clamp(20px,3.5vw,36px)}.lesson__title{font-size:clamp(22px,2.6vw,30px);margin-bottom:6px}.lesson__speakers{font-weight:600;margin-bottom:16px}.lesson__body{color:var(--ink-2);max-width:62ch}.lesson__actions{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 8px}.lesson__materials{margin-top:28px}.lesson__side{border-left:1px solid var(--line);padding-left:clamp(20px,3vw,36px)}@media(max-width:820px){.lesson{grid-template-columns:1fr}.lesson__side{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:24px}}.chapters{list-style:none;margin:0;padding:0;display:grid;gap:6px}.chapter{width:100%;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;text-align:left;padding:10px 12px;border-radius:12px;border:1px solid transparent;background:var(--surface-2);cursor:pointer;transition:border-color .15s ease}.chapter:hover{border-color:var(--brand-line)}.chapter:disabled{cursor:default;opacity:.6}.chapter__time{font-variant-numeric:tabular-nums;font-weight:700;color:var(--brand);font-size:14px;min-width:3.2em}.chapter__label{font-size:15px}.chapter__play{width:18px;height:18px;color:var(--muted)}.notes{margin-top:28px}.notes__head{display:flex;justify-content:space-between;align-items:baseline;gap:12px}.notes__field{resize:vertical;min-height:96px}.lesson__nav{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line)}.lesson__navlink{display:grid;gap:2px;padding:18px clamp(20px,3.5vw,36px);background:transparent;border:0;text-align:left;cursor:pointer;font-weight:600;font-size:15px}.lesson__navlink:hover{background:var(--surface-2)}.lesson__navlink--next{text-align:right;justify-items:end;border-left:1px solid var(--line)}@media(max-width:520px){.lesson__nav{grid-template-columns:1fr}.lesson__navlink--next{border-left:0;border-top:1px solid var(--line)}}