Modern web app UI layout mockup for a visual prompt compiler (functional SaaS de...

Modern web app UI layout mockup for a visual prompt compiler (functional SaaS design targeting general creators), dark mode theme with sleek slate gray and deep obsidian panels. Premium, clean vertical pipeline interface with a high signal-to-noise ratio, strictly avoiding messy node graphs or over-designed visual clutter. The layout is structured into three distinct zones under a clean top navigation bar (Pipeline | Compose | Preview): 1. LEFT PANEL (Preset Library): A clean 'Asset Drawer' layout featuring polished, one-click visual preset cards (e.g., 'Cinematic Sci-Fi', 'Moody Fantasy', 'Product Photography'). This replaces complex manual configuration sliders, allowing users to drag or click a preset to instantly populate the center pipeline. 2. CENTER WORKSPACE (The Generation Pipeline): A clean, vertical top-to-bottom sequence of minimalist, flat card blocks connected by thin vertical lines (stages: 'Core Concept' $\rightarrow$ 'Environment' $\rightarrow$ 'Subject' $\rightarrow$ 'Lighting'). The currently active card is visually brighter and highlighted. Cards display the selected concept, a conversational 'Because you selected...' reasoning block, and interactive inline suggestion chips acting as autocomplete. At the bottom sits a minimal 'Creative Freedom' slider and an 'Avoid' (negative prompt) tag input block. 3. RIGHT PANEL (Traceability & Compiled Output): Features a compiled prompt text block with semantic syntax highlighting and a visual color legend mapping text segments to their pipeline categories. Visualizes a real-time 'Semantic Traceability' hover interaction: a cursor hovers over a highlighted phrase in the text, causing the corresponding vertical stage card in the center pipeline to brilliantly pulse and glow, proving a 1:1 bidirectional relationship. Minimalist sans-serif typography, flat UI design, distinct bright accent colors (neon blue, teal, purple) used for active states and semantic color-coding, highly spacious layout, professional creative software aesthetic mimicking high-end modern editors.