What problem does it solve? Web interfaces often suffer from unclear visual hierarchy, inconsistent spacing, misaligned elements, and layouts that break under resizing, localization, or RTL direction. This Skill provides concrete layout principles and a structured review format to catch and fix these issues in frontend code. ## Core Features & Use Cases - Layout Principles: Ten actionable rules covering grouping with negative space, shared alignment edges, logical CSS properties, reading order, progressive disclosure, safe areas, and content-driven breakpoints. - Structured Code Review: A standalone review output format with severity-rated findings (HIGH/MEDIUM/LOW), before/after fixes, verification steps, and a final verdict. - Use Case: When building a settings page in React with Tailwind, apply the skill to replace separator lines with spacing-based grouping, switch physical margins to logical properties for RTL support, and verify the layout holds at small viewports. ## Quick Start Review the layout of my React components in src/ and report spacing, alignment, and responsive issues with fixes.