## MODIFIED Requirements

### Requirement: Core layout is device-agnostic and responsive
The system SHALL preserve responsive readability while enabling sticky header and footer surfaces.

#### Scenario: Sticky shrinking glass header
- **WHEN** user scrolls downward
- **THEN** header remains sticky with slight height reduction, subtle elevation, and glass blur effect
- **AND** controls remain readable and usable at all breakpoints

#### Scenario: Sticky footer does not overlap core reading zones
- **WHEN** footer is sticky
- **THEN** content remains readable and interactive controls are not obscured
- **AND** mobile/tablet/desktop layouts stay overflow-safe