.cluster-header.svelte-11rj12s.svelte-11rj12s{position:sticky;top:0;z-index:50;background-color:var(--color-background);border-bottom:1px solid var(--color-border)}.cluster-header-content.svelte-11rj12s.svelte-11rj12s{display:flex;align-items:center;justify-content:space-between;padding:0 1rem;height:3rem;max-width:42rem;margin:0 auto}.header-back-btn.svelte-11rj12s.svelte-11rj12s,.header-home-btn.svelte-11rj12s.svelte-11rj12s{display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;color:var(--color-text-muted);text-decoration:none}.header-title.svelte-11rj12s.svelte-11rj12s{font-family:var(--font-heading);font-size:1rem;font-weight:600;color:var(--color-text);letter-spacing:.02em;margin:0}.cluster-main.svelte-11rj12s.svelte-11rj12s{max-width:42rem;margin:0 auto;padding:0 1.25rem 3rem}.cluster-hero.svelte-11rj12s.svelte-11rj12s{padding:2rem 0 1.5rem;text-align:center}.cluster-badge.svelte-11rj12s.svelte-11rj12s{display:inline-block;font-family:var(--font-body);font-size:.6875rem;font-weight:600;text-transform:uppercase;letter-spacing:.2em;color:var(--color-text-muted);margin-bottom:.5rem}.cluster-title.svelte-11rj12s.svelte-11rj12s{font-size:2rem;line-height:1.15;margin:0 0 .75rem;color:var(--color-text)}.cluster-description.svelte-11rj12s.svelte-11rj12s{font-size:1rem;line-height:1.7;color:var(--color-text-muted);margin:0 0 1rem;max-width:32rem;margin-left:auto;margin-right:auto}.cluster-count.svelte-11rj12s.svelte-11rj12s{font-family:var(--font-body);font-size:.875rem;font-weight:600;color:var(--color-text-muted);margin:0}.lesson-list.svelte-11rj12s.svelte-11rj12s{display:flex;flex-direction:column}.connector-line.svelte-11rj12s.svelte-11rj12s{width:1px;height:.75rem;background-color:var(--color-border);margin-left:2rem}.lesson-card.svelte-11rj12s.svelte-11rj12s{display:block;text-decoration:none;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-base);padding:1rem;box-shadow:var(--shadow-sm);transition:border-color var(--transition-base),box-shadow var(--transition-base)}.lesson-card.svelte-11rj12s.svelte-11rj12s:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md)}.lesson-card-content.svelte-11rj12s.svelte-11rj12s{display:flex;align-items:flex-start;gap:1rem}.lesson-number-badge.svelte-11rj12s.svelte-11rj12s{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);color:var(--color-text);font-family:var(--font-body);font-weight:var(--font-weight-semibold);font-size:.875rem}.lesson-info.svelte-11rj12s.svelte-11rj12s{flex:1;min-width:0}.lesson-title.svelte-11rj12s.svelte-11rj12s{font-family:var(--font-body);font-size:1rem;font-weight:600;color:var(--color-text);margin:0 0 .25rem;line-height:1.3}.lesson-author.svelte-11rj12s.svelte-11rj12s{font-size:.8125rem;color:var(--color-text-muted);margin:0 0 .375rem}.lesson-description.svelte-11rj12s.svelte-11rj12s{font-size:.9375rem;color:var(--color-text-muted);line-height:1.6;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lesson-arrow.svelte-11rj12s.svelte-11rj12s{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:2rem;height:2.5rem;color:var(--color-text-muted)}.cluster-navigation.svelte-11rj12s.svelte-11rj12s{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--color-border)}.nav-prev.svelte-11rj12s.svelte-11rj12s,.nav-next.svelte-11rj12s.svelte-11rj12s{display:flex;flex-direction:column;text-decoration:none;padding:.5rem 0}.nav-prev.svelte-11rj12s.svelte-11rj12s{align-items:flex-start;text-align:left}.nav-next.svelte-11rj12s.svelte-11rj12s{align-items:flex-end;text-align:right}.nav-label.svelte-11rj12s.svelte-11rj12s{font-size:.6875rem;text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-muted);margin-bottom:.25rem}.nav-next.svelte-11rj12s .nav-label.svelte-11rj12s{color:var(--color-text);font-weight:600}.nav-cluster-title.svelte-11rj12s.svelte-11rj12s{display:flex;align-items:center;gap:.5rem;font-family:var(--font-heading);font-size:1rem;color:var(--color-text);font-weight:600}.nav-cluster-title.svelte-11rj12s svg.svelte-11rj12s{flex-shrink:0}@media (max-width: 640px){.cluster-title.svelte-11rj12s.svelte-11rj12s{font-size:1.75rem}.lesson-card-content.svelte-11rj12s.svelte-11rj12s{flex-wrap:wrap}.lesson-arrow.svelte-11rj12s.svelte-11rj12s{display:none}.cluster-navigation.svelte-11rj12s.svelte-11rj12s{grid-template-columns:1fr}.nav-next.svelte-11rj12s.svelte-11rj12s{align-items:flex-start;text-align:left;padding-top:1rem;border-top:1px solid var(--color-border-light)}.nav-next.svelte-11rj12s .nav-cluster-title.svelte-11rj12s{flex-direction:row-reverse}}