Multi-Layer CSS Box-Shadow Generator for Web Design

Technical Specification: Multi-Layer CSS Box-Shadow Generator

Overview

A high-performance, client-side web application designed to allow developers and UI designers to create, stack, and manipulate CSS box-shadows in real-time. The application focuses on 'stacking' logic to allow for complex, soft-shadow aesthetics.

Layout & Design

• Color Palette: A neutral dark-mode UI (Charcoal backgrounds: #1a1a1a) to ensure the shadow effects are easily visible against a preview area.
• Interface Structure:
  • Left Sidebar: Control panel for individual shadow layers (Add/Delete/Reorder buttons).
  • Center Preview: A large responsive canvas containing a 'Sample Element' that updates dynamically.
  • Right Panel: Read-only code output block with a 'Copy to Clipboard' function.

Interactive Features

1. Layer Management: Users can add unlimited shadow layers. Each layer contains sliders for: X-offset, Y-offset, Blur radius, Spread radius, and RGBA Color Picker.
2. Visual Reordering: Drag-and-drop handles to change the stack order of shadows (Z-index influence).
3. Real-time Rendering: Instant DOM updates as the user manipulates any slider.
4. CSS Export: A highlighted code block showing the full box-shadow: ...; syntax, ready for production use.
5. Preset Library: A set of common patterns (e.g., 'Soft Card', 'Floating Button', 'Deep Elevation') to bootstrap user designs.

Technical Implementation

• Frontend Framework: Vanilla JavaScript or lightweight framework for maximum speed.
• Styling: CSS variables for dynamic shadow application via element.style.boxShadow.
• State Management: A central state object that tracks an array of objects, where each object holds the properties for a single shadow layer.
• Animation: CSS transitions on UI controls for a smooth user experience.