.lesson-page{--mf-bg:#020914;--mf-surface:#071321;--mf-surface-raised:#0b1a2b;--mf-surface-hover:#102338;--mf-accent:#00d98b;--mf-accent-soft:rgba(0,217,139,0.1);--mf-text:#ffffff;--mf-text-secondary:#a8b8ca;--mf-text-muted:#71849a;--mf-border:#173047;--mf-border-light:#203b54;--mf-danger:#ef6464;--mf-radius:10px;--mf-radius-small:8px;min-height:100vh;padding:48px 0 90px;background:var(--mf-bg);color:var(--mf-text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.lesson-container{width:min(860px,calc(100% - 48px));margin:0 auto}.lesson-back{display:inline-flex;align-items:center;gap:9px;margin-bottom:32px;color:var(--mf-text-secondary);font-size:14px;font-weight:700;text-decoration:none;transition:color .18s ease,transform .18s ease}.lesson-back:hover{color:var(--mf-accent);transform:translateX(-3px)}.lesson-hero{position:relative;overflow:hidden;padding:44px;margin-bottom:30px;border:1px solid var(--mf-border);border-radius:var(--mf-radius);background:linear-gradient(135deg,rgba(0,217,139,.075),transparent 62%),var(--mf-surface)}.lesson-hero:after{position:absolute;top:-130px;right:-130px;width:320px;height:320px;border:1px solid rgba(0,217,139,.07);border-radius:50%;content:"";pointer-events:none}.lesson-eyebrow{position:relative;z-index:1;margin-bottom:22px;color:var(--mf-accent);font-size:11px;font-weight:800;letter-spacing:1.8px;line-height:1.4;text-transform:uppercase}.lesson-heading-row{position:relative;z-index:1;display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.lesson-number{display:inline-flex;align-items:center;justify-content:center;width:fit-content;min-width:38px;height:32px;padding:0 11px;margin-bottom:15px;border:1px solid rgba(0,217,139,.28);border-radius:7px;background:var(--mf-accent-soft);color:var(--mf-accent);font-size:12px;font-weight:800}.lesson-hero h1{max-width:700px;margin:0;color:var(--mf-text);font-size:clamp(34px,5vw,54px);font-weight:800;line-height:1.08;letter-spacing:-1.8px}.lesson-duration{flex-shrink:0;padding:9px 13px;border:1px solid var(--mf-border-light);border-radius:7px;color:var(--mf-text-secondary);font-size:12px;font-weight:700;white-space:nowrap}.lesson-hero p{position:relative;z-index:1;max-width:720px;margin:25px 0 0;color:var(--mf-text-secondary);font-size:16px;line-height:1.9}.section-label{margin-bottom:11px;color:var(--mf-accent);font-size:11px;font-weight:800;letter-spacing:1.8px;line-height:1.4;text-transform:uppercase}.lesson-objectives{padding:30px;margin-bottom:42px;border:1px solid var(--mf-border);border-radius:var(--mf-radius);background:var(--mf-surface)}.lesson-objectives h2,.lesson-takeaways h2{margin:0 0 22px;color:var(--mf-text);font-size:28px;font-weight:800;line-height:1.2;letter-spacing:-.8px}.lesson-objectives ul,.lesson-takeaways ul{display:grid;gap:13px;margin:0;padding:0;list-style:none}.lesson-objectives li,.lesson-takeaways li{position:relative;padding-left:23px;color:var(--mf-text-secondary);font-size:14px;line-height:1.75}.lesson-objectives li:before,.lesson-takeaways li:before{position:absolute;top:.7em;left:0;width:7px;height:7px;border-radius:50%;background:var(--mf-accent);content:""}.lesson-content{margin-bottom:42px}.lesson-section{padding-bottom:34px;margin-bottom:34px;border-bottom:1px solid var(--mf-border)}.lesson-section:last-child{margin-bottom:0}.lesson-section h2{margin:0 0 19px;color:var(--mf-text);font-size:28px;font-weight:800;line-height:1.25;letter-spacing:-.8px}.lesson-section p{margin:0 0 17px;color:var(--mf-text-secondary);font-size:16px;line-height:1.9}.lesson-section p:last-child{margin-bottom:0}.lesson-section ul{display:grid;gap:10px;margin:20px 0 0;padding-left:22px;color:var(--mf-text-secondary);font-size:15px;line-height:1.8}.lesson-section li::marker{color:var(--mf-accent)}.lesson-takeaways{padding:30px;margin-bottom:42px;border:1px solid rgba(0,217,139,.24);border-radius:var(--mf-radius);background:linear-gradient(135deg,rgba(0,217,139,.07),transparent 70%),var(--mf-surface)}.lesson-navigation{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding-top:30px;border-top:1px solid var(--mf-border)}.lesson-nav-button{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:9px;min-height:94px;padding:19px 21px;border:1px solid var(--mf-border);border-radius:var(--mf-radius-small);text-decoration:none;transition:transform .18s ease,border-color .18s ease,background .18s ease,box-shadow .18s ease}.lesson-nav-button:hover{border-color:var(--mf-accent);box-shadow:0 10px 25px rgba(0,0,0,.16);transform:translateY(-3px)}.lesson-nav-button span{font-size:14px;font-weight:800;line-height:1.4}.lesson-nav-button small{color:var(--mf-text-secondary);font-size:12px;line-height:1.5}.primary-button{background:var(--mf-accent);color:#001b11}.primary-button small{color:#164b39}.secondary-button{background:var(--mf-surface-raised);color:var(--mf-text)}.secondary-button:hover{background:var(--mf-surface-hover)}.lesson-back:focus-visible,.lesson-nav-button:focus-visible{outline:2px solid var(--mf-accent);outline-offset:4px}@media (max-width:760px){.lesson-page{padding:30px 0 65px}.lesson-container{width:min(100% - 32px,620px)}.lesson-back{margin-bottom:25px}.lesson-hero{padding:29px;margin-bottom:24px}.lesson-heading-row{flex-direction:column;gap:15px}.lesson-hero h1{font-size:clamp(32px,9vw,46px);letter-spacing:-1.2px}.lesson-hero p{margin-top:21px;font-size:15px;line-height:1.8}.lesson-objectives,.lesson-takeaways{padding:24px;margin-bottom:32px}.lesson-objectives h2,.lesson-section h2,.lesson-takeaways h2{font-size:25px}.lesson-section p{font-size:15px;line-height:1.85}.lesson-section ul{font-size:14px}.lesson-navigation{grid-template-columns:1fr;padding-top:24px}.lesson-nav-button{min-height:82px}}@media (max-width:480px){.lesson-container{width:calc(100% - 24px)}.lesson-hero{padding:23px}.lesson-eyebrow{font-size:10px;letter-spacing:1.4px}.lesson-hero h1{font-size:32px}.lesson-objectives,.lesson-takeaways{padding:21px}.lesson-objectives h2,.lesson-section h2,.lesson-takeaways h2{font-size:24px}.lesson-nav-button{padding:17px}}@media (prefers-reduced-motion:reduce){.lesson-back,.lesson-nav-button{transition:none}.lesson-back:hover,.lesson-nav-button:hover{transform:none}}