Protocol: Premium Utilitarian Minimalism UI Architect

Adapted copy of Leonxlnx/taste-skill (MIT). Changes are listed in UPSTREAM.md. Offline rule for this copy: do not fetch URLs, hotlink external assets, or install packages on your own; propose commands and wait for the user's approval.

1. Protocol Overview

Name: Premium Utilitarian Minimalism & Editorial UI Description: An advanced frontend engineering directive for generating highly refined, ultra-minimalist, "document-style" web interfaces analogous to top-tier workspace platforms. This protocol strictly enforces a high-contrast warm monochrome palette, bespoke typographic hierarchies, meticulous structural macro-whitespace, bento-grid layouts, and an ultra-flat component architecture with deliberate muted pastel accents. It actively rejects standard generic SaaS design trends.

2. Absolute Negative Constraints (Banned Elements)

The AI must strictly avoid the following generic web development defaults:

• DO NOT use the "Inter", "Roboto", or "Open Sans" typefaces.
• DO NOT use generic, thin-line icon libraries like "Lucide", "Feather", or standard "Heroicons".
• DO NOT use Tailwind's default heavy drop shadows (e.g., shadow-md, shadow-lg, shadow-xl). Shadows must be practically non-existent or heavily customized to be ultra-diffuse and low opacity (< 0.05).
• DO NOT use primary colored backgrounds for large elements or sections (e.g., no bright blue, green, or red hero sections).
• DO NOT use gradients, neon colors, or 3D glassmorphism (beyond subtle navbar blurs).
• DO NOT use rounded-full (pill shapes) for large containers, cards, or primary buttons.
• DO NOT use emojis anywhere in code, markup, text content, headings, or alt text. Replace with proper icons or clean SVG primitives.
• DO NOT use generic placeholder names like "John Doe", "Acme Corp", or "Lorem Ipsum". Use realistic, contextual content.
• DO NOT use AI copywriting clichés: "Elevate", "Seamless", "Unleash", "Next-Gen", "Game-changer", "Delve". Write plain, specific language.

3. Typographic Architecture

The interface must rely on extreme typographic contrast and premium font selection to establish an editorial feel.

• Primary Sans-Serif (Body, UI, Buttons): Use clean, geometric, or system-native fonts with character. Target: font-family: 'SF Pro Display', 'Geist Sans', 'Helvetica Neue', 'Switzer', sans-serif.
• Editorial Serif (Hero Headings & Quotes): Target: font-family: 'Lyon Text', 'Newsreader', 'Playfair Display', 'Instrument Serif', serif. Apply tight tracking (letter-spacing: -0.02em to -0.04em) and tight line-height (1.1).
• Monospace (Code, Keystrokes, Meta-data): Target: font-family: 'Geist Mono', 'SF Mono', 'JetBrains Mono', monospace.
• Text Colors: Body text must never be absolute black (#000000). Use off-black/charcoal (#111111 or #2F3437) with a generous line-height of 1.6 for legibility. Secondary text should be muted gray (#787774).

4. Color Palette (Warm Monochrome + Spot Pastels)

Color is a scarce resource, utilized only for semantic meaning or subtle accents.

• Canvas / Background: Pure White #FFFFFF or Warm Bone/Off-White #F7F6F3 / #FBFBFA.
• Primary Surface (Cards): #FFFFFF or #F9F9F8.
• Structural Borders / Dividers: Ultra-light gray #EAEAEA or rgba(0,0,0,0.06).
• Accent Colors: Exclusively use highly desaturated, washed-out pastels for tags, inline code backgrounds, or subtle icon backgrounds.
  • Pale Red: #FDEBEC (Text: #9F2F2D)
  • Pale Blue: #E1F3FE (Text: #1F6C9F)
  • Pale Green: #EDF3EC (Text: #346538)
  • Pale Yellow: #FBF3DB (Text: #956400)

5. Component Specifications

• Bento Box Feature Grids:
  • Utilize asymmetrical CSS Grid layouts.
  • Cards must have exactly border: 1px solid #EAEAEA.
  • Border-radius must be crisp: 8px or 12px maximum.
  • Internal padding must be generous (e.g., 24px to 40px).
• Primary Call-To-Action (Buttons):
  • Solid background #111111, text #FFFFFF.
  • Slight border-radius (4px to 6px). No box-shadow.
  • Hover state should be a subtle color shift to #333333 or a micro-scale transform: scale(0.98).
• Tags & Status Badges:
  • Pill-shaped (border-radius: 9999px), very small typography (text-xs), uppercase with wide tracking (letter-spacing: 0.05em).
  • Background must use the defined Muted Pastels.
• Accordions (FAQ):
  • Strip all container boxes. Separate items only with a border-bottom: 1px solid #EAEAEA.
  • Use a clean, sharp + and - icon for the toggle state.
• Keystroke Micro-UIs:
  • Render shortcuts as physical keys using <kbd> tags: border: 1px solid #EAEAEA, border-radius: 4px, background: #F7F6F3, using the Monospace font.
• Faux-OS Window Chrome:
  • When mocking up software, wrap it in a minimalist container with a white top bar containing three small, light gray circles (replicating macOS window controls).

6. Iconography & Imagery Directives

• System Icons: Use "Phosphor Icons (Bold or Fill weights)" or "Radix UI Icons" for a technical, slightly thicker-stroke aesthetic. Standardize stroke width across all icons.
• Illustrations: Monochromatic, rough continuous-line ink sketches on a white background, featuring a single offset geometric shape filled with a muted pastel color.
• Photography: Use high-quality, desaturated images with a warm tone. Apply subtle overlays (opacity: 0.04 warm grain) to blend photos into the monochrome palette. Never use oversaturated stock photos. When real assets are unavailable, use labeled local placeholder blocks (warm off-white, fixed aspect ratio) and list the images the user needs to provide. Never hotlink stock or placeholder image services.
• Hero & Section Backgrounds: Sections should not feel empty and flat. Use subtle full-width background imagery at very low opacity, soft radial light spots (radial-gradient with warm tones at opacity: 0.03), or minimal geometric line patterns to add depth without breaking the clean aesthetic.

7. Subtle Motion & Micro-Animations

Motion should feel invisible — present but never distracting. The goal is quiet sophistication, not spectacle.

• Scroll Entry: Elements fade in gently as they enter the viewport. Use translateY(12px) + opacity: 0 resolving over 600ms with cubic-bezier(0.16, 1, 0.3, 1). Use IntersectionObserver, never window.addEventListener('scroll').
• Hover States: Cards lift with an ultra-subtle shadow shift (box-shadow transitioning from 0 0 0 to 0 2px 8px rgba(0,0,0,0.04) over 200ms). Buttons respond with scale(0.98) on :active.
• Staggered Reveals: Lists and grid items enter with a cascade delay (animation-delay: calc(var(--index) * 80ms)). Never mount everything at once.
• Background Ambient Motion: Optional. A single, very slow-moving radial gradient blob (animation-duration: 20s+, opacity: 0.02-0.04) drifting behind hero sections. Must be applied to a position: fixed; pointer-events: none layer. Never on scrolling containers.
• Performance: Animate exclusively via transform and opacity. No layout-triggering properties (top, left, width, height). Use will-change: transform sparingly and only on actively animating elements.

8. Execution Protocol

When tasked with writing frontend code (HTML, React, Tailwind, Vue) or designing a layout:

1. Establish the macro-whitespace first. Use massive vertical padding between sections (e.g., py-24 or py-32 in Tailwind).
2. Constrain the main typography content width to max-w-4xl or max-w-5xl.
3. Apply the custom typographic hierarchy and monochromatic color variables immediately.
4. Ensure every card, divider, and border adheres strictly to the 1px solid #EAEAEA rule.
5. Add scroll-entry animations to all major content blocks.
6. Ensure sections have visual depth through imagery, ambient gradients, or subtle textures — no empty flat backgrounds.
7. Provide code that reflects this high-end, uncluttered, editorial aesthetic natively without requiring manual adjustments.