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72px);background:#fff}.learning-shell{width:min(980px,calc(100% - 56px));margin:0 auto;padding:24px 0 80px}.lesson-tabs{display:flex;gap:10px;padding-bottom:12px;border-bottom:1px solid var(--line)}.lesson-tabs button{width:44px;height:44px;border:1px solid transparent;border-radius:8px;color:var(--ink);background:#edf3fa;font-weight:850;cursor:pointer}.lesson-tabs button.active{color:#fff;background:var(--blue-dark)}.lesson-panel{min-height:520px;padding:34px 0 0}.lesson-kicker{color:var(--blue-dark)}.lesson-panel h2{margin:0 0 16px;font-size:30px}.lesson-copy{max-width:760px;margin:0 0 18px;color:#34495c;font-size:18px;line-height:1.7}.lesson-copy-blocks{margin-bottom:32px}.lesson-copy-blocks .lesson-copy{margin-bottom:18px}.lesson-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 28px;max-width:920px;margin:0 0 32px;padding:0;list-style:none}.lesson-points li{position:relative;padding-left:28px;line-height:1.6}.lesson-points li:before{position:absolute;left:0;top:8px;width:11px;height:6px;border-bottom:2px solid var(--green);border-left:2px solid var(--green);content:"";transform:rotate(-45deg)}.video-placeholder{display:grid;grid-template-columns:72px 1fr;align-items:center;gap:18px;max-width:760px;min-height:160px;margin:8px 0 24px;padding:28px;border:1px solid var(--line);border-radius:8px;background:linear-gradient(#17212bb8,#17212b9e),url(https://images.unsplash.com/photo-1516321318423-f06f85e504b3?auto=format&fit=crop&w=1000&q=80);background-position:center;background-size:cover;color:#fff}.video-embed-shell{width:min(760px,100%);aspect-ratio:16 / 9;overflow:hidden;margin:8px 0 24px;border:1px solid var(--line);border-radius:8px;background:#111a23;box-shadow:var(--shadow)}.video-embed{display:block;width:100%;height:100%;border:0}.video-placeholder span{display:grid;width:68px;height:68px;place-items:center;border-radius:50%;background:#fff}.video-placeholder span:before{display:block;width:0;height:0;margin-left:5px;border-bottom:13px solid transparent;border-left:20px solid var(--coral);border-top:13px solid transparent;content:""}.video-placeholder p{margin:0;font-size:20px;font-weight:800;line-height:1.4}.quiz-box{max-width:760px;padding:24px;border:1px solid var(--line);border-radius:8px;background:#fbfdff}.quiz-box h3{margin:0 0 8px}.quiz-box p{margin:0 0 18px;line-height:1.55}.choices{display:grid;gap:10px}.choices label{display:grid;grid-template-columns:20px 1fr;gap:10px;align-items:start;padding:12px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}.choices input{width:17px;height:17px;margin:2px 0 0}.answer-feedback{margin:18px 0 0;padding:12px 14px;border-radius:8px;font-weight:800}.answer-feedback.correct{color:#174c42;background:#dcf4ec}.answer-feedback.missed{color:#7a3a12;background:#fff0de}.not-found{display:grid;min-height:calc(100vh - 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