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0}.video-placeholder[data-astro-cid-j2onytrj]{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;padding:1rem;text-align:center;background:linear-gradient(145deg,#14263b,#0f172a);color:#9eb7cc}.video-placeholder[data-astro-cid-j2onytrj] svg[data-astro-cid-j2onytrj]{margin-bottom:.4rem;width:clamp(28px,4vw,44px);height:auto}.video-placeholder[data-astro-cid-j2onytrj] strong[data-astro-cid-j2onytrj]{color:#edf5fc;font-size:clamp(1rem,1.6vw,1.25rem);font-weight:600}.video-placeholder[data-astro-cid-j2onytrj] span[data-astro-cid-j2onytrj]{font-size:.85rem}.sr-status[data-astro-cid-j2onytrj]{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:46rem){.player-layout[data-astro-cid-j2onytrj]{grid-template-columns:1fr}}.lesson[data-astro-cid-nraanpgw]{max-width:48rem;padding-block:var(--space-7)}.lesson[data-astro-cid-nraanpgw] h1[data-astro-cid-nraanpgw]{font-size:var(--fs-h1)}.catalog-return[data-astro-cid-nraanpgw]{display:inline-flex;align-items:center;gap:var(--space-2);min-height:2.75rem;margin-bottom:var(--space-4);padding:var(--space-2) var(--space-4);background:var(--brand-accent-soft);border:1px solid var(--brand-accent);border-radius:var(--radius-md);color:var(--brand-accent);font-weight:var(--fw-heading);text-decoration:none}.catalog-return[data-astro-cid-nraanpgw]:hover,.catalog-return[data-astro-cid-nraanpgw]:focus-visible{background:var(--brand-accent-strong);color:var(--brand-on-accent);text-decoration:none}.catalog-return[data-astro-cid-nraanpgw]:focus-visible{outline:2px solid var(--text);outline-offset:2px}.lesson-context[data-astro-cid-nraanpgw]{margin:0 0 var(--space-2);color:var(--text-dim);font-size:var(--fs-small)}.body[data-astro-cid-nraanpgw] h2{font-size:var(--fs-h2);margin-top:var(--space-6)}.body[data-astro-cid-nraanpgw] p,.body[data-astro-cid-nraanpgw] li{color:var(--text-dim)}.body[data-astro-cid-nraanpgw] code{font-family:var(--font-mono);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:.1em .35em;font-size:.9em}.body[data-astro-cid-nraanpgw] pre{background:var(--surface)!important;border:1px solid var(--line);border-radius:var(--radius-md);padding:var(--space-4);overflow-x:auto}.pager[data-astro-cid-nraanpgw]{display:flex;justify-content:space-between;gap:var(--space-4);margin-top:var(--space-7);flex-wrap:wrap}.open-lab[data-astro-cid-nraanpgw]{display:flex;align-items:center;gap:var(--space-4);margin-top:var(--space-6);flex-wrap:wrap}