.content-wrapper{display:flex;gap:2rem;max-width:1200px;margin:0 auto;padding:1.5rem}.main-content{flex:1;min-width:0;max-width:none}@media (min-width: 1200px){.content-wrapper{max-width:1300px;gap:3rem}.page-sidebar{width:180px}}@media (min-width: 1400px){.content-wrapper{max-width:1400px}}@media (max-width: 992px){.content-wrapper{flex-direction:column;max-width:100%;gap:1rem}.page-sidebar{width:100%;position:static;margin-top:2rem;order:2}}.page-sidebar{flex-shrink:0}.lesson-content,.main-content>article{width:100%;max-width:none}.btn{display:inline-block;padding:0.5rem 1rem;text-decoration:none;border-radius:4px;font-weight:500;transition:all 0.2s ease}.btn-outline{border:1px solid #007bff;color:#007bff;background:transparent}.btn-outline:hover{background:#007bff;color:white}.btn-primary{background:#007bff;color:white;border:1px solid #007bff}.btn-primary:hover{background:#0056b3;border-color:#0056b3}