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.2s;display:block}.sidebar-lesson:hover{background:var(--color-surface-hover)}.sidebar-lesson-active{background:var(--color-accent-light);color:var(--color-accent);font-weight:600}.lesson-main{flex:1;max-width:56rem;padding:2rem 3rem}.lesson-breadcrumb{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.03em;margin-bottom:.5rem;font-size:.8125rem}.lesson-title{letter-spacing:-.02em;margin-bottom:1.5rem;font-size:1.75rem;font-weight:800}.lesson-video-placeholder{aspect-ratio:16/9;background:var(--color-surface-alt);border:2px dashed var(--color-border);color:var(--color-text-muted);border-radius:.75rem;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;margin-bottom:2rem;font-size:.9375rem;display:flex}.lesson-nav{border-top:1px solid var(--color-border);justify-content:space-between;padding-top:1.5rem;display:flex}@media (max-width:768px){.lesson-layout{flex-direction:column}.lesson-sidebar{border-right:none;border-bottom:1px solid var(--color-border);width:100%;max-height:none;position:static}.lesson-main{padding:1.5rem}}