1. Single-layer illusion: The tab strip looks like a single continuous flat surface without clear borders, elevation, or visual separation between tab #1, tab #2, etc.
2. Poor active state contrast: The color difference (luminance contrast) between the active tab's pill/container and the inactive tabs is barely noticeable in daytime lighting. Users constantly have to squint or search with their eyes to locate the tab they are currently working on.

Proposed Improvement

1. High-contrast active tab background: Make the active tab background distinctly brighter or add a subtle soft drop-shadow / border outline to separate it from inactive tabs.
2. Visual accent indicator: Introduce an optional or default accent indicator line (or colored top border / dot) for the active tab, consistent with modern WCAG accessibility guidelines.
3. Subtle dividers between inactive tabs: Add subtle divider lines between inactive tabs in the Light Theme so users can clearly see where one tab ends and the next begins.