usability enhancements

openspec/changes/p13-usability-enhancements/specs/responsive-device-agnostic-layout/spec.md

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+## MODIFIED Requirements
+
+### Requirement: Core layout is device-agnostic and responsive
+The system SHALL render key surfaces (header, hero, feed, modal, footer) responsively across mobile, tablet, and desktop viewports.
+
+#### Scenario: Mobile layout behavior
+- **WHEN** a user opens the site on a mobile viewport
+- **THEN** content remains readable without horizontal overflow
+- **AND** interactive controls remain reachable and usable
+
+#### Scenario: Desktop and tablet adaptation
+- **WHEN** a user opens the site on tablet or desktop viewports
+- **THEN** layout reflows according to breakpoint design rules
+- **AND** no key content or controls are clipped
+
+#### Scenario: Readability-focused typography and contrast updates
+- **WHEN** content is rendered in core reading surfaces
+- **THEN** typography and color choices improve baseline readability
+- **AND** updates remain compatible with responsive behavior across breakpoints