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.empty-state{align-items:center;background:#fff;border:1px dashed #94a3b8;border-radius:8px;color:#64748b;display:flex;font-weight:700;min-height:88px;padding:0 1rem}@media(max-width:640px){.structure-row[data-astro-cid-7o7gduth],.node-row[data-astro-cid-7o7gduth]{flex-wrap:nowrap}.structure-actions[data-astro-cid-7o7gduth] button[data-astro-cid-7o7gduth]{flex:1 1 130px}}.lesson-page[data-astro-cid-umyckmwo]{box-sizing:border-box;max-width:920px;width:100%}.back-link[data-astro-cid-umyckmwo]{color:#2563eb;display:inline-block;font-weight:700;margin-bottom:1rem;text-decoration:none}.back-link[data-astro-cid-umyckmwo]:hover{text-decoration:underline}article[data-astro-cid-umyckmwo]{background:#fff;border:1px solid #e2e8f0;border-radius:8px;box-sizing:border-box;box-shadow:0 1px 3px #0f172a14;padding:2rem}.post-meta[data-astro-cid-umyckmwo]{color:#64748b;display:flex;flex-wrap:wrap;gap:.5rem 1rem;font-size:.95rem;font-weight:700;margin-bottom:2rem}article[data-astro-cid-umyckmwo] 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