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openspec/specs/hero-summary-entry-and-readability/spec.md

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+## Purpose
+
+Canonical specification for hero-summary-entry-and-readability requirements synced from OpenSpec change deltas.
+
+## Requirements
+
+### Requirement: Hero primary action opens in-site TL;DR summary
+The homepage hero primary CTA SHALL open the in-site summary modal for the hero article instead of navigating off-site.
+
+#### Scenario: Hero CTA opens summary modal
+- **WHEN** a user clicks the hero primary CTA
+- **THEN** the system opens the summary modal for the current hero article
+- **AND** no external navigation is triggered by that CTA
+
+### Requirement: Hero source link remains available as secondary action
+The hero section SHALL keep an explicit secondary source-link action for external navigation.
+
+#### Scenario: Source link navigates externally
+- **WHEN** a user clicks the hero source link
+- **THEN** the system opens the article source URL in a new tab
+
+### Requirement: Hero metadata readability over images
+Hero metadata (`LATEST`, relative time, headline, and summary) SHALL remain visually legible across bright and dark images on desktop and mobile.
+
+#### Scenario: Bright image background
+- **WHEN** the hero image contains bright regions under metadata text
+- **THEN** overlay and text styles preserve readable contrast for metadata and headline blocks
+
+#### Scenario: Mobile viewport readability
+- **WHEN** the hero renders on a mobile viewport
+- **THEN** metadata and title remain readable without overlapping controls or clipping