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span{font-family:var(--font-mono);font-size:var(--text-xs);font-variant-numeric:tabular-nums}.observatory-chapter-nav a strong{min-width:0;overflow:hidden;font-size:var(--text-xs);font-weight:600;white-space:nowrap}.observatory-chapter-nav a[aria-current=location]{grid-template-columns:auto 1fr;gap:var(--space-2);color:var(--color-foreground);background:transparent}.observatory-chapter-nav a[aria-current=location]:after{content:"";position:absolute;inset-inline:var(--space-2);inset-block-end:0;height:var(--line-emphasis);border-radius:var(--radius-full);background:var(--component-nav-active)}.observatory-nav-actions{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-2)}.observatory-control{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-width:2.75rem;min-height:2.75rem;padding:var(--space-2) var(--space-3);border:var(--line-hairline) solid transparent;border-radius:var(--radius-sm);color:var(--component-audio-control-text);background:transparent;font:inherit;font-size:var(--text-xs);text-decoration:none;cursor:pointer;transition:color var(--motion-duration-fast) var(--motion-ease-out),border-color var(--motion-duration-fast) var(--motion-ease-out),background var(--motion-duration-fast) var(--motion-ease-out)}.observatory-control:hover,.observatory-control:active,.observatory-control[aria-pressed=true]{color:var(--color-foreground);border-color:var(--component-button-border);background:var(--component-audio-control-bg)}.observatory-control-symbol{display:inline-flex;align-items:center;justify-content:center;min-width:1rem;color:var(--scene-orbit-color);font-size:var(--text-lg);line-height:1}.observatory-theme-symbol{width:.9rem;aspect-ratio:1;border:var(--line-hairline) solid currentColor;border-radius:var(--radius-full);background:linear-gradient(90deg,currentColor 50%,transparent 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