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.rec-card:hover{border-color:var(--brand-light);box-shadow:var(--shadow-sm)}.rec-rank{color:var(--brand);min-width:1.5rem;padding-top:2px;font-size:1rem;font-weight:900}.rec-title{margin-bottom:4px;font-size:.95rem;font-weight:700}.lesson-layout-doc{grid-template-columns:256px 1fr;align-items:start;gap:24px;display:grid}@media (width<=900px){.lesson-layout-doc{grid-template-columns:1fr}}.lesson-sidebar{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:16px;position:sticky;top:80px}.sidebar-section-title{letter-spacing:.1em;text-transform:uppercase;color:var(--text-light);margin:14px 0 8px;font-size:.7rem;font-weight:800}.sidebar-section-title:first-child{margin-top:0}.lesson-nav-list{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.lesson-nav-item{border-radius:var(--radius-sm);color:var(--text-muted);border:1.5px solid #0000;align-items:flex-start;gap:6px;padding:9px 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