.lesson-player{grid-column:1/-1;display:grid;grid-template-columns:300px minmax(0,1fr);color:var(--rr-ink);background:var(--rr-paper)}.lesson-rail{position:sticky;top:0;align-self:start;min-height:100vh;padding:42px 24px;color:var(--rr-cream);background:var(--rr-noir);border-right:1px solid var(--rr-line-dark)}.lesson-rail>p,#lesson-number,.offer-router>p{margin:0 0 14px;color:var(--rr-lime);font:600 12px/1.4 var(--rr-mono);letter-spacing:.11em;text-transform:uppercase}.progress-track{height:4px;margin:0 0 30px;overflow:hidden;background:#f4f2ea26}.progress-track span{display:block;width:0;height:100%;background:var(--rr-lime);transition:width .35s}.lesson-rail ol{display:grid;gap:8px;margin:0;padding:0;list-style:none}.lesson-rail button{display:grid;grid-template-columns:34px 1fr;gap:2px 10px;width:100%;min-height:74px;padding:12px;color:var(--rr-cream);text-align:left;background:transparent;border-color:var(--rr-line-dark)}.lesson-rail button span{grid-row:1/3;color:var(--rr-lime);font-family:var(--rr-mono)}.lesson-rail button strong{overflow:hidden;font:600 14px/1.25 var(--rr-body);text-overflow:ellipsis;white-space:nowrap}.lesson-rail button small{color:#f4f2ea8c;font:10px var(--rr-mono);text-transform:uppercase}.lesson-rail button.active{color:var(--rr-noir);background:var(--rr-lime);border-color:var(--rr-lime)}.lesson-rail button.active span,.lesson-rail button.active small{color:var(--rr-noir)}.lesson-rail button:disabled{opacity:.38}.lesson-stage{min-width:0;padding:clamp(48px,7vw,100px) clamp(24px,7vw,104px)}.lesson-heading{max-width:940px;margin-bottom:38px}.lesson-heading h2{max-width:950px;margin:0;color:var(--rr-ink);font-size:clamp(2.7rem,6vw,6.5rem)}.video-frame{position:relative;display:grid;place-items:center;aspect-ratio:16/9;max-width:1100px;overflow:hidden;color:var(--rr-cream);background:var(--rr-noir);border-radius:14px}.video-frame video{width:100%;height:100%;background:#000}.video-empty{display:grid;place-items:center;gap:8px;padding:30px;text-align:center}.video-empty span,.video-empty small{color:var(--rr-lime);font:11px var(--rr-mono);text-transform:uppercase}.video-empty strong{max-width:650px;font:700 clamp(1.5rem,4vw,3.6rem)/1 var(--rr-display)}.watch-readout{display:flex;justify-content:space-between;max-width:1100px;padding:13px 2px;border-bottom:1px solid var(--rr-line-light);font:600 11px var(--rr-mono);text-transform:uppercase}.lesson-notes{max-width:900px;margin:46px 0;border-block:1px solid var(--rr-line-light)}.lesson-notes summary{padding:22px 0;cursor:pointer;font:600 13px var(--rr-mono);text-transform:uppercase}.lesson-notes>div{padding-bottom:30px}.lesson-notes h3{margin-top:34px;color:var(--rr-ink);font-size:1.45rem;line-height:1.15}.lesson-comments{max-width:900px;margin-top:58px;padding-top:42px;border-top:1px solid var(--rr-line-light)}.comments-heading{display:flex;align-items:baseline;justify-content:space-between}.comments-heading h3{color:var(--rr-ink);font-size:clamp(1.8rem,3vw,3rem)}.comment-list{display:grid;gap:10px;margin:22px 0 30px}.comment{padding:18px;background:var(--rr-surface);border:1px solid var(--rr-line-light);border-radius:14px}.comment p{margin:7px 0 0}#comment-form{display:grid;gap:10px}#comment-form textarea{min-height:120px;padding:14px;resize:vertical;background:var(--rr-surface);border:1px solid #14161a4d;border-radius:9px;font:inherit}#comment-form button{justify-self:start}.lesson-actions{display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:900px;margin-top:54px;padding:28px 0;border-top:1px solid var(--rr-line-light)}.lesson-actions p{max-width:560px;color:#14161aa6}.offer-router{margin:70px calc(clamp(24px,7vw,104px)*-1) calc(clamp(48px,7vw,100px)*-1);padding:clamp(54px,7vw,96px) clamp(24px,7vw,104px);color:var(--rr-cream);background:var(--rr-noir-soft)}.offer-router h3{max-width:970px;color:var(--rr-cream);font-size:clamp(2.3rem,5vw,5.4rem)}.offer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:38px}.offer-grid a{display:flex;min-height:220px;flex-direction:column;padding:24px;color:var(--rr-cream);text-decoration:none;background:var(--rr-noir);border:1px solid var(--rr-line-dark);border-radius:14px}.offer-grid a:hover{border-color:var(--rr-lime)}.offer-grid span{color:var(--rr-lime);font:600 11px var(--rr-mono);text-transform:uppercase}.offer-grid strong{margin-top:auto;font:700 1.65rem var(--rr-display)}.offer-grid small{margin-top:8px;color:#f4f2ea9e}@media(max-width:900px){.lesson-player{grid-template-columns:1fr}.lesson-rail{position:relative;min-height:0}.lesson-rail ol{grid-template-columns:repeat(5,minmax(150px,1fr));overflow-x:auto}.offer-grid{grid-template-columns:1fr}.offer-grid a{min-height:160px}}@media(max-width:560px){.lesson-stage{padding:48px 20px}.lesson-actions{align-items:stretch;flex-direction:column}.offer-router{margin-inline:-20px;padding-inline:20px}.lesson-rail{padding:30px 20px}}