trpc.io

DESIGN.md

Narrative design system document — paste directly into Claude Code, Cursor, or Bolt.

---
version: alpha
name: trpc.io
description: "Light product system built on #ffffff with #398ccb as the primary CTA accent. Type anchored in system-ui at 48px / weight 800. Extracted automatically from https://trpc.io/ — rendered styles via getComputedStyle() + CSS custom properties (token-only values may not be painted)."
narrative: |
  trpc.io is built on a pure-white canvas (rgb(255,255,255)).
  The system uses rgb(57, 140, 203) as the accent for primary actions and brand signals.
  Sharp 0px corners on CTAs — architectural restraint, engineering precision alongside system-ui as the primary typeface.
  A layered elevation system (8 distinct shadows) building a clear front-to-back hierarchy.
  Motion is a first-class concern — 6 keyframe animations plus transition-driven interactions.

colors:
  background: "#ffffff"
  surface-1: "#ffffff"
  surface-2: "#f4f4f5"
  ink: "#1c1e21"
  ink-muted: "rgba(28, 30, 33, 0.65)"
  ink-subtle: "#474748"
  primary: "#398ccb"
  on-primary: "#111111"
  hairline: "#969faf"
  semantic-error: "#fd9c9f"
  semantic-success: "#008b00"
  semantic-warning: "#e6a700"
  semantic-info: "#87d8f2"

typography:
  display-xl:
    fontFamily: "Inter, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif"
    fontSize: 48px
    fontWeight: 800
    lineHeight: 1
    letterSpacing: -1.2px
  display-lg:
    fontFamily: "Ubuntu, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif"
    fontSize: 48px
    fontWeight: 800
    lineHeight: 1
    letterSpacing: -1.2px
  display-md:
    fontFamily: "Ubuntu, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif"
    fontSize: 20px
    fontWeight: 700
    lineHeight: 1.4
    letterSpacing: 0
  body:
    fontFamily: "ui-sans-serif, Georgia, 'Times New Roman', serif"
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0
  body-sm:
    fontFamily: "ui-sans-serif, Georgia, 'Times New Roman', serif"
    fontSize: 14px
    fontWeight: 500
    lineHeight: 1.5
    letterSpacing: 0
  button:
    fontFamily: "ui-sans-serif, Georgia, 'Times New Roman', serif"
    fontSize: 18px
    fontWeight: 700
    lineHeight: 1.56
    letterSpacing: 0
  eyebrow:
    fontFamily: "ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, monospace"
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0

rounded:
  none: 0px
  xs: 4px
  sm: 8px
  md: 12px
  lg: 16px
  xl: 9999px

spacing:
  xxs: 2px
  xs: 4px
  sm: 8px
  md: 12px
  lg: 24px
  xl: 32px
  xxl: 60px

components:
  button-light--invert:
    backgroundColor: "{colors.surface-2}"
    textColor: "{colors.hairline}"
    typography: "{typography.body}"
    rounded: "{rounded.xs}"
    padding: 0px 8px
  button-primary-brand:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.surface-1}"
    typography: "{typography.button}"
    rounded: "{rounded.sm}"
    padding: 8px 16px
  button-dark--solid:
    backgroundColor: "#171717"
    textColor: "{colors.primary}"
    typography: "{typography.body}"
    rounded: "{rounded.sm}"
  navigation-main-nav:
    backgroundColor: "transparent"
    typography: "{typography.body}"
    rounded: "{rounded.none}"
    padding: 96px 0px 0px
  code-block-inline-code--pre:
    backgroundColor: "{colors.surface-1}"
    textColor: "#24292e"
    typography: "{typography.body}"
    rounded: "{rounded.sm}"

extracted_at: "2026-06-11T06:19:05.119Z"
completeness: 84
scoreVersion: "v2"

---

# Design System — trpc.io
> Extracted automatically by Prism from https://trpc.io
> Date: 2026-06-11
> Viewport: Desktop 1440x900 + Mobile 390x844
> Values are extracted, not hand-written: rendered styles via getComputedStyle() + colors declared in CSS custom properties (token-only values are marked `(token)` and may not be painted).

> ⚠️ **LOW-CONFIDENCE CAPTURE** — this extraction likely sampled an app shell / interactive demo, **not** the marketing page. Signals: button labels look like filenames (Node.js); only 0 card component detected. Treat the component, color and copy values below with caution, and re-extract the canonical marketing URL if fidelity matters.


## 0. Design DNA

**Density**: moderate  |  **Motion**: subtle  |  **Weight**: heavy  |  **Aesthetic**: product-neutral

| Dimension | Value | Signal |
|---|---|---|
| Canvas | neutral | `#ffffff` |
| Type posture | sans-led (Roboto) | "Move Fast and Break Nothing. E" |
| Color assertion | dual-accent | #398ccb |
| Whitespace | moderate | section rhythm 48px |
| Interaction | subtle | 6 keyframes, 17 transitions |
| Radius language | 8px-rounded | from token scale |

**Prism fingerprint**: `neutral-canvas · sans-display · dual-accent · 8px-rounded · subtle-motion`

> **🤖 TL;DR for AI agents** (read this first — saves you scanning the full doc):
>
> - **Canvas**: `rgb(255,255,255)` is the page background. Every component composits against this.
> - **Accent**: `rgb(57, 140, 203)` for primary CTAs ONLY. Never decorative.
> - **Body type**: 16px (token: `typography.body`). Default for ALL text not in a heading role.
> - **Section rhythm**: 48px between major bands. Card padding: 24px.
> - **Default radius**: 8px on buttons/inputs. Pills (`9999px`) only for icon-buttons or status chips.
>
> **Before generating UI**: import this DESIGN.md, scan §2 (Color Palette) + §4 (Components) + §10 (Agent Guide). Skip §11–12 unless extending.

## 1. Visual Theme & Atmosphere

**Signature:** a radial gradient glow in the hero — colours: #f4f4f5, #262626. This is the brand's most recognizable visual — reproduce it, don't replace it with a generic card or flat panel.

trpc.io uses a pure-white canvas (`#ffffff`), letting typography, color and imagery carry the visual weight. 

Headlines are set in **system-ui**, a sans-serif display face (the dominant type signature, e.g. "Move Fast and Break Nothing. End-to-end typesafe APIs made e" at 48px). Body text is set in **Roboto**. Headlines use weight 800 for confident, assertive presence — the brand wants to be heard. Negative letter-spacing at display sizes (-1.2px at 48px) compresses headlines into engineered blocks, dense and precise. 

Body text reads in Near-Black (`#1c1e21`) — softened from pure black, a small but deliberate detail that lowers reading friction. **Steel Blue** (`#398ccb`) is the single high-saturation color in the system — it earns its presence only on interactive elements, making CTAs and links the unmistakable focal points against the otherwise neutral palette. Elevation is built from multi-layer shadow stacks (8 distinct) — each combines several blurred layers at varying offsets to build a clear front-to-back hierarchy. 
Border radius varies from pill-shaped (fully rounded) to moderately rounded elements, creating visual rhythm. Motion design uses smooth easing curves for polished state transitions. 

**Key Characteristics:**
- Background: Pure White (`#ffffff`)
- Primary typeface: Inter
- Primary text: Near-Black (`#1c1e21`)
- Accent: Steel Blue (`#398ccb`)
- Display: 48px weight 800, letter-spacing -1.2px
- Shadow system: 8 distinct elevation levels
- Custom fonts loaded: Inter

## 2. Color Palette & Roles

### Background & Surface
- **Pure White** (`#ffffff`): Page background (primary)
- **Whitesmoke** (`#e5e7eb`): Surface / elevated background
- **Off-White** (`#f4f4f5`): Surface / elevated background
- **#fde68a** (`#fde68a`): Surface / elevated background
- **Soft Pink** (`#fbcfe8`): Surface / elevated background

### Text & Content
- **Near-Black** (`#1c1e21`): Primary body text
- **Pure Black** (`#000000`): Secondary text
- **Deep Navy** (`#0f172a`): Secondary text
- **Charcoal** (`#1e293b`): Secondary text
- **Near-Black** (`#171717`): Secondary text

### Accent & Interactive
- **Cool Gray** (`#969faf`): Interactive / accent
- **Steel Blue** (`#398ccb`): Interactive / accent
- **Lavender** (`#c7d2fe`): Interactive / accent
- **Deep Purple** (`#4f46e5`): Interactive / accent
- **#d97706** (`#d97706`): Interactive / accent
- **Cherry** (`#db2777`): Interactive / accent
- **#fed7aa** (`#fed7aa`): Interactive / accent

### Border & Divider
- **Whitesmoke** (`#dadde1`): Borders / dividers
- **Light Grey** (`#c2c3c5`): Borders / dividers
- **Whitesmoke** (`#e4e4e7`): Borders / dividers
- **Light Blue** (`#c9d1d9`): Borders / dividers

### Full Extracted Palette
**50 colors rendered on the page** + **66** more declared in design tokens (CSS custom properties — not necessarily painted). (21 categorized above + 95 additional below.)
Rendered values are read via `getComputedStyle()`; token values come from CSS variable declarations. Third-party logo colors are filtered out.

- `#52525b` — Charcoal
- `#ea580c` — Bright Orange
- `#d9f99d` — #d9f99d
- `#65a30d` — #65a30d
- `#bae6fd` — Light Blue
- `#0284c7` — #0284c7
- `#24292e` — Near-Black
- `#d32f2f` — M Tricolor Red
- `#1976d2` — M Tricolor Blue
- `#6f42c1` — Slate Blue
- `#ebedf0` — Whitesmoke
- `#22863a` — Forest Green
- `#212121` — Near-Black
- `#f6f7f8` — Off-White
- `#18181b` — Near-Black
- `#3f3f46` — Charcoal
- `#a1a1aa` — Grey
- `#444950` — Dark Gray
- `#1f2937` — Charcoal
- `#ec4899` — #ec4899
- `#f5f6f7` — Off-White
- `#606770` — Dim Gray
- `#0d1117` — Near-Black
- `#ff7b72` — Coral
- `#79c0ff` — Baby Blue
- `#d2a8ff` — Lavender
- `#ffa657` — Tangerine
- `#a5d6ff` — Light Blue
- `#8b949e` — Cool Gray
- `#ebf2fc` — Light Gray *(token)*
- `#589ed3` — Cornflower Blue *(token)*
- `#f1f1f1` — Off-White *(token)*
- *…+63 more in `raw-css.json` (`desktop.allColors`).*

### CSS Custom Properties (Design Tokens)

**Spacing Token**
- `--ifm-menu-link-padding-vertical`: `.375rem`
- `--ifm-spacing-vertical`: `1rem`
- `--ifm-card-horizontal-spacing`: `1rem`
- `--ifm-alert-padding-horizontal`: `1rem`

**Primary Brand Color**
- `--ifm-color-primary-contrast-background`: `#ebf2fc`
- `--ifm-color-primary-lighter`: `#589ed3`
- `--ifm-color-primary-dark`: `#317eb9`
- `--ifm-color-primary-contrast-foreground`: `#102445`

**Font Size Token**
- `--ifm-h2-font-size`: `1.5rem`
- `--ifm-blockquote-font-size`: `100%`
- `--ifm-font-size-base`: `100%`
- `--ifm-code-font-size`: `95%`

**Font Weight Token**
- `--ifm-font-weight-semibold`: `500`
- `--ifm-font-weight-base`: `400`
- `--ifm-font-weight-normal`: `400`
- `--ifm-button-font-weight`: `700`

**Success**
- `--ifm-color-success-darker`: `#008b00`
- `--ifm-color-success-contrast-foreground`: `#003100`
- `--ifm-color-success-lightest`: `#80d280`
- `--ifm-color-success-light`: `#26b226`

**Secondary Color**
- `--ifm-color-secondary-contrast-background`: `#fdfdfe`
- `--ifm-color-secondary-darker`: `#c8c9cc`
- `--ifm-font-color-secondary`: `#525860`
- `--ifm-color-secondary`: `#ebedf0`

**Border Radius Token**
- `--ifm-pre-border-radius`: `.4rem`
- `--ifm-pagination-nav-border-radius`: `.4rem`
- `--ifm-card-border-radius`: `calc(.4rem*2)`
- `--ifm-pagination-border-radius`: `.4rem`

**Error / Destructive**
- `--ifm-color-danger-lightest`: `#fd9c9f`
- `--ifm-color-danger-lighter`: `#fb7478`
- `--ifm-color-danger-light`: `#fb565b`
- `--ifm-color-danger-darker`: `#d53035`

**Warning**
- `--ifm-color-warning-dark`: `#e6a700`
- `--ifm-color-warning-lightest`: `#ffdd80`
- `--ifm-color-warning-contrast-background`: `#fff8e6`
- `--ifm-color-warning`: `#ffba00`

**Z-Index Token**
- `--ifm-z-index-overlay`: `400`
- `--ifm-z-index-dropdown`: `100`
- `--ifm-z-index-fixed`: `200`

**Text Color**
- `--ifm-color-content`: `#1c1e21`
- `--ifm-color-content-inverse`: `#fff`
- `--ifm-color-content-secondary`: `#525860`

**Motion Token**
- `--ifm-transition-fast`: `.2s`
- `--ifm-button-transition-duration`: `.2s`
- `--ifm-transition-timing-default`: `cubic-bezier(.08,.52,.52,1)`

**Shadow Token**
- `--ifm-global-shadow-tl`: `0 12px 28px 0 rgba(0,0,0,.2),0 2px 4px 0 rgba(0,0,0,.1)`
- `--tw-drop-shadow`: ``
- `--ifm-global-shadow-lw`: `0 1px 2px 0 rgba(0,0,0,.1)`
- `--ifm-blockquote-shadow`: `none`

**Font Family Token**
- `--ifm-font-family-monospace`: `SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace`

**Background**
- `--ifm-menu-color-background-hover`: `rgba(0,0,0,.05)`
- `--ifm-pills-color-background-active`: `rgba(0,0,0,.05)`
- `--ifm-menu-color-background-active`: `rgba(0,0,0,.05)`

**Other tokens**
- `--ifm-badge-border-color`: ``
- `--ifm-table-head-color`: ``
- `--ifm-pre-color`: ``
- `--ifm-heading-color`: ``
- `--ifm-scrollbar-track-background-color`: `#f1f1f1`
- `--ifm-color-gray-400`: `#ccd0d5`
- `--ifm-blockquote-color`: `#444950`
- `--ifm-navbar-link-color`: `#1c1e21`

## 3. Typography Rules

### Font Families
- **Primary**: `ui-sans-serif`
- **Secondary**: `system-ui`
- **Font 3**: `Inter`
- **Font 4**: `codicon`
- **Font 5**: `ui-monospace`

### Custom Fonts Loaded
- **Inter** weight 400 (normal)
- **codicon** weight normal (normal)

### Typography Hierarchy

| Role | Font | Size | Weight | Line Height | Letter Spacing | Notes |
|------|------|------|--------|-------------|----------------|-------|
| Display Hero | Inter | 48px | 800 | 1 | -1.2px | Main headline (h1) |
| Section Heading | Ubuntu | 48px | 800 | 1 | -1.2px | Section titles (h1) |
| Sub-heading | Ubuntu | 20px | 700 | 1.4 | normal | Third-level heading (h3) |
| Button Large | ui-sans-serif | 18px | 700 | 1.56 | normal | Button label (18px) |
| Body | ui-sans-serif | 16px | 400 | 1.5 | normal | Standard reading text |
| Button Large | ui-sans-serif | 16px | 500 | 1.5 | normal | Button label (16px) |
| Eyebrow / Overline | ui-monospace | 16px | 400 | 1.5 | normal | Label above heading, uppercase tag |
| Link | ui-sans-serif | 14px | 500 | 1.5 | normal | Link (14px) — Decoration: none |

### Font Weight Scale

CSS custom properties define 9 explicit weight steps:
- `--ifm-font-weight-light`: `300` — Light
- `--ifm-font-weight-base`: `400` — Regular
- `--ifm-font-weight-normal`: `400` — Regular
- `--ifm-font-weight-semibold`: `500` — Medium
- `--ifm-dropdown-font-weight`: `500` — Medium
- `--ifm-button-font-weight`: `700` — Bold
- `--ifm-table-head-font-weight`: `700` — Bold
- `--ifm-heading-font-weight`: `700` — Bold
- `--ifm-font-weight-bold`: `700` — Bold

### Full Font Size Scale

Sizes detected in the design (descending): `48px`, `30px`, `24px`, `20px`, `18px`, `16px`, `14px`

> 2 size(s) detected outside the sampled hierarchy (30px, 24px). These appear on elements not in the sampled set — likely additional display sizes, marketing-section overrides, or third-party-widget styles.

## 4. Component Stylings

### Buttons

**Light / Invert**
- Background: `#f4f4f5` `{colors.surface-2}`
- Text: `#969faf` `{colors.hairline}`
- Padding: 0px 8px
- Radius: 6px
- Font: 16px weight 500
- Use: Bright CTA on dark sections

**Primary Brand**
- Background: `#398ccb` `{colors.primary}`
- Text: `#ffffff` `{colors.surface-1}`
- Padding: 8px 16px
- Radius: 8px
- Shadow: `rgba(14, 165, 233, 0.2) 0px 20px 25px -5px, rgba(14, 165, 233, 0.2) 0px 8px 10px...`
- Font: 18px weight 700
- Use: Primary CTA / brand action

**Dark / Solid**
- Background: `#171717`
- Text: `#398ccb` `{colors.primary}`
- Padding: 0px
- Radius: 8px
- Border: 20px solid rgb(23, 23, 23)
- Shadow: `rgba(57, 140, 203, 0.15) 0px -24px 300px 0px`
- Font: 16px weight 400
- Use: Solid dark CTA

**Subtle**
- Background: `rgba(0, 0, 0, 0.3)`
- Text: `#ffffff` `{colors.surface-1}`
- Padding: 6.4px 8px
- Radius: 6.4px
- Font: 16px weight 400
- Use: Quiet action against page bg

### Navigation

**Main Nav**
- Background: `transparent`
- Padding: 96px 0px 0px
- Radius: none
- Font: 16px weight 400
- Use: Static flex nav — N/A items
- Hover: color: `#243e53`, outline: `rgb(36, 62, 83) none 3px`

### Code Blocks

**Inline Code / Pre**
- Background: `#ffffff` `{colors.surface-1}`
- Text: `#24292e`
- Padding: 0px
- Radius: 6.4px
- Border: 1px solid rgb(218, 221, 225)
- Font: 16px weight 400 — ui-monospace
- Use: Code samples, CLI commands, syntax highlighting blocks


## 4b. Component Behaviors (State Matrix)

### Interaction State Narrative

- **NavLink**:
  - **hover:** text #1c1e21 → #243e53
- **FooterLink**:
  - **hover:** text #606770 → #4e7899

*State transitions extracted via Playwright simulation — exact values in the YAML matrix below.*

```yaml
component-behaviors:
  button:
    default:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(28, 30, 33)"
  link:
    default:
      bg: "rgb(255, 255, 255)"
      fg: "rgb(28, 30, 33)"
  navLink:
    default:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(28, 30, 33)"
    hover:
      bg: "transparent"
      fg: "rgb(36, 62, 83)"
  footerLink:
    default:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(96, 103, 112)"
    hover:
      bg: "transparent"
      fg: "rgb(78, 120, 153)"
```

**Agent usage**: Validate generated components against this matrix. If your output's `:hover` state changes properties not listed here, you are off-brand.


## 4c. Component Vocabulary (Closed System)

*This brand uses ONLY the following component vocabulary. Introducing new variants without justification breaks the system's tonal coherence.*

### Buttons
- **4 shape(s)** in this system: `Light / Invert`, `Primary Brand`, `Dark / Solid`, `Subtle`
- **DO NOT introduce new buttons variants** without justification

### Navigation
- **1 shape(s)** in this system: `Main Nav`
- **DO NOT introduce new navigation variants** without justification

### Code Blocks
- **1 shape(s)** in this system: `Inline Code / Pre`
- **DO NOT introduce new code blocks variants** without justification

## 5. Layout Principles

### Layout Type
**top-nav + content**

### Grid
Single column, centered content

### Max Width
1320px

### Spacing System
Compact spacing — information density prioritized

| Token | Value |
|-------|-------|
| xxs | 2px |
| xs | 4px |
| sm | 8px |
| md | 12px |
| base | 16px |
| lg | 24px |
| xl | 32px |
| 2xl | 48px |
| 3xl | 60px |

### Border Radius Scale
| Name | Value | Use |
|------|-------|-----|
| None | 0px | No rounding |
| Xs | 4px | Tiny corners (badges, micro elements) |
| Sm | 8px | Buttons, inputs, small elements |
| Md | 12px | Cards, containers |
| Lg | 16px | Large rounded elements, pill segments |
| Xl | 9999px | Category strips, featured containers |
| Full | 9999px | Pills, avatars, circular elements |

### Shape Language

| Component | Border Radius |
|-----------|---------------|
| Buttons | `6px` |
| Navigation | `none` |
| Code Blocks | `6.4px` |
| Page Body | `0px` |

**Shape Personality**: Moderate Rounding — Medium corners (4–12px). Modern SaaS standard, neither sharp nor pill.

**Full Radius Spectrum**: 0px, 2px, 2.96px, 3px, 4px, 6px, 6.4px, 8px (from `allBorderRadii` scan)


## 5b. Spacing Rhythm Names

**Measured section padding**: bands use ~32px internal vertical padding (up to 72px) — **compact**. (Distinct from the gap *between* sections above.) Reproduce this generous vertical breathing room; cramped spacing is the #1 tell of a cheap clone.

*Named spacing tokens with explicit use cases. Use these names in YOUR code instead of raw pixels for consistency.*

| Name | Value | Use case |
|------|-------|----------|
| **hero** | `60px` | Top/bottom of full-bleed hero sections |
| **section** | `32px` | Between major bands (color change, content shift) |
| **subsection** | `24px` | Within a section, between content groups |
| **card** | `12px` | Card padding, list-item spacing |
| **compact** | `8px` | Form fields, tight clusters, badge padding |
| **micro** | `4px` | Icon-text gap, tag inner padding |

**Agent rule**: NEVER hardcode raw pixel values for spacing in generated UI. Always reference these named tokens (`spacing-rhythm.section`, etc.).

## 5c. Widget & Structure Library

Structural patterns extracted from the page DOM — these are the **blueprints** an agent should follow to reproduce the page architecture (not just CSS values).

**5/8 structural patterns detected.**

### Hero Pattern

- **Composition:** centered — Centered composition — heading + subheading + CTAs stacked vertically, content centered horizontally. Common for SaaS marketing pages.
- **Viewport coverage:** full-viewport hero (≥70% screen height)
- **Heading:** "Move Fast and Break Nothing. End-to-end typesafe APIs made easy." — 48px center-aligned
- **Subheading:** "Experience the full power of TypeScript inference to boost productivity for your full-stack application."
- **Media:** present, positioned top
- **CTAs:** 3 (primary: "Star40,311")
- **Clone instruction:** Reproduce the **centered** layout. Use the heading font-size token at the documented size. Place media top of text.

### Navigation Pattern

- **Position:** sticky (stays visible during scroll)
- **Layout:** logo-left-links-left — Logo and links both on the left (CTAs typically right)
- **Height:** 60px
- **Logo:** ✓ present
- **Nav links:** 6 primary items
- **CTAs in nav:** 0 (no buttons — links only)
- **Theme toggle:** ✓ dark/light mode switcher present
- **Clone instruction:** Build a sticky logo left links left navigation. Link-only — no button styling needed.

### Card Grid Pattern

- **Card count:** 6 cards detected
- **Columns (desktop):** 4-up grid
- **Card dimensions:** 408×164px (aspect 2.49:1)
- **Gap:** 24px between cards
- **Content:** ✗ no image + icon
- **Clone instruction:** Build a 4-column grid (desktop) with cards at ~2.49:1 aspect ratio. Text/icon-only cards (no photography).

### Testimonial Pattern

- **Count:** 13 testimonial blocks
- **Layout:** grid
- **Avg quote length:** 198 chars (medium quote)
- **Includes:** ✗ no avatars | ✗ no logos | ✗ no ratings
- **Clone instruction:** Build a grid of 13 testimonials.   

### Footer Pattern

- **Columns:** 3
- **Links:** 10 total
- **Height:** 276px
- **Includes:** ✗ no newsletter | ✓ social icons |  
- **Clone instruction:** Build a 3-column footer with ~3 links per column, social media links.

## 6. Depth & Elevation

| Level | Treatment | Use |
|-------|-----------|-----|
| Flat (Level 0) | No shadow | Page background, content blocks |
| Layered (Level 1) | <br>`rgba(0, 0, 0, 0.2) 0px 5px 40px 0px` | Cards, elevated surfaces |
| Layered (Level 2) | <br>`rgba(14, 165, 233, 0.2) 0px 20px 25px -5px`,<br>`rgba(14, 165, 233, 0.2) 0px 8px 10px -6px` | Cards, elevated surfaces |
| Layered (Level 3) | <br>`rgba(0, 0, 0, 0.1) 0px 20px 25px -5px`,<br>`rgba(0, 0, 0, 0.1) 0px 8px 10px -6px` | Cards, elevated surfaces |
| Layered (Level 4) | <br>`rgba(57, 140, 203, 0.15) 0px -24px 300px 0px` | Cards, elevated surfaces |

**Shadow Philosophy**: Multi-layered shadow system creating natural, atmospheric depth. Each shadow level combines multiple layers for realistic elevation.

## 7. Motion & Interaction

### Easing System

| CSS Variable | Curve | Semantic Name |
|--------------|-------|---------------|
| `--ifm-transition-timing-default` | `cubic-bezier(.08,.52,.52,1)` | Custom Ease — Balanced |

### Duration Scale

| CSS Variable | Value | Tier |
|--------------|-------|------|
| `--ifm-button-transition-duration` | `.2s` | Normal |

### Copy-Paste Transition Snippets

**Color / Background**
```css
transition: color 0.2s cubic-bezier(0.08, 0.52, 0.52, 1);
```

**Opacity**
```css
transition: opacity 0.2s cubic-bezier(0.08, 0.52, 0.52, 1), transform 0.2s cubic-bezier(0.08, 0.52, 0.52, 1), visibility 0.2s cub...;
```

**Background**
```css
transition: background 0.2s;
```

**All Props**
```css
transition: 0.2s cubic-bezier(0.08, 0.52, 0.52, 1);
```

### Keyframe Animation Catalog

| Animation Name | Type | Animated Props | Use Hint |
|----------------|------|----------------|----------|
| `infinite-scroll` | Slide | transform | UI transition |
| `loader` | Fade + Move | opacity, transform | Loading indicator |
| `pulse` | Fade | opacity | Attention / status |
| `loading-spin_HK5v` | Rotate / Spin | transform | Loading indicator |
| `fade-in` | Fade | opacity | Element entrance |
| `loading_zvTa` | Custom | background-position-x, background-position-y | Loading indicator |

### Motion Fingerprint

- **Speed Character**: Balanced Pacing (median duration: `200ms`)
- **Dominant Easing**: custom cubic-bezier curves
- **Animation Library**: 6 unique animations (6 total including variants)

> This design moves with balanced pacing timing using custom cubic-bezier curves, creating a UI that feels natural and fluid.

## 8. Do's and Don'ts

### Do
- Use Near-Black (`#1c1e21`) for text — not pure black, it's warmer and more readable
- Use ui-sans-serif as the primary typeface — it defines the brand personality
- Use negative letter-spacing (-1.2px) at display sizes for compressed, editorial headlines
- Use the extracted shadow patterns for elevation — they are tuned to match the brand palette
- Use full-pill radius (9999px) only for specific elements (avatars, pills, toggles)
- Use Steel Blue (`#398ccb`) as the primary accent — it's the brand's signature interactive color
- Use 8px border-radius on buttons — the standard corner rounding for interactive elements
- Keep navigation sticky to the top — the design uses a persistent navigation pattern
- Maintain nav height at 60px — consistent vertical space for the navigation bar
- Respect the 4px–32px spacing range — the design uses a wide scale for visual breathing room
- Make the hero full-viewport (≥70% screen height) — this design uses an immersive hero, not a tall navbar
- Include exactly 3 CTAs in the hero (primary + secondary) — this design pattern is multi-action, not single-purpose
- Make the navigation sticky — it stays visible during scroll, signaling content depth
- Include a theme toggle in the nav — dark mode is a first-class feature
- Each card uses an icon (not photo) — the visual language is illustrative, not photographic
- Use a 4-column grid on desktop — density matters for this content type
- Lay out testimonials in a grid (13+ items) — quantity signals scale and trust

### Don't
- Don't use pure black (`#000000`) for text — the near-black adds warmth
- Don't substitute with generic sans-serif or serif — the custom font carries the brand
- Don't increase letter-spacing on headings — the type is designed to run tight at scale
- Don't invent new shadow values — use only the extracted shadow levels
- Don't apply pill radius on rectangular buttons or cards — it's reserved for specific interactive elements
- Don't introduce additional saturated accent colors — the palette is intentionally controlled
- Don't collapse or hide the nav on scroll without an explicit scroll-triggered animation — the design uses fixed nav presence
- Don't put a CTA button in the nav — this design uses links only at the top


## 7b. Enforceable Brand Rules

*Structured Do/Don't with reasoning and validation tests. Agents can programmatically verify generated UI.*

```yaml
rules:
  - id: brand-canvas-001
    type: do
    rule: "Always use the page background `rgb(255,255,255)` as the base canvas"
    why: "Every component is designed to composit against this exact tone"
    test: "document.body.style.backgroundColor === 'rgb(255,255,255)'"
  - id: brand-accent-001
    type: do
    rule: "Reserve `rgb(57, 140, 203)` for primary CTAs and brand-mark signals only"
    why: "Single chromatic assertion device — overuse dilutes meaning"
    test: "querySelectorAll('[style*=\"rgb(57, 140, 203)\"]').length <= 3 per fold"
```

## 9. Responsive Behavior

### Breakpoints
| Name | Width | Key Changes |
|------|-------|-------------|
| Mobile | 400px | Single column, compact spacing |
| Mobile | 460px | Single column, compact spacing |
| Mobile Large | 640px | Expanded mobile layout |
| Tablet | 768px | Multi-column grids begin |
| Tablet | 996px | Multi-column grids begin |
| Desktop | 1280px | Full feature layout |
| Large Desktop | 1440px | Maximum content width |

### Token Diff — Desktop vs Mobile

| Element | Property | Desktop | Mobile |
|---------|----------|---------|--------|
| heading | font-size | `48px` | `24px` |
| heading | line-height | `48px` | `30px` |
| heading | letter-spacing | `-1.2px` | `-0.6px` |
| button | width | `auto` | `30px` |

### Collapsing Strategy
- Headlines: 48px → 24px on mobile
- Navigation: horizontal links → hamburger menu on mobile
- Cards: multi-column → stacked vertical on mobile
- Footer: multi-column → stacked single column on mobile

### Touch Targets
- Buttons: 0px padding
- Navigation: adequate spacing between items
- Interactive elements: minimum 44px touch target recommended

### Collapsing Narrative

How the structural patterns adapt from desktop to mobile (extracted from both viewport extractions):

- **Hero CTAs:** 3 on desktop → 1 on mobile (secondary CTAs dropped on small screens).
- **Navigation collapses to hamburger** — 6 links visible on desktop, 1 on mobile (the rest hide behind a menu toggle).
- **Card grid: 4-up → 1-up** — cards stack as viewport narrows, becoming a vertical list on mobile.
- **Footer columns collapse:** 3 columns (desktop) → 1 column (mobile).


## 7c. Visual Effects & Dynamic Behavior

*The live/dynamic layer beyond static CSS — reproduce these, not flat substitutes. This is often what separates a faithful clone from a wireframe.*

- **Mesh gradients** — 1 multi-stop organic color field(s) as background atmosphere.

> **Motion fingerprint**: mesh gradients

## 9b. Visual Tone & Photography

**Tone:** Mixed photography + illustration

A balanced mix of photographic content and vector graphics. Photos likely carry product/lifestyle context while SVG handles icons, logos, and decorative accents.

**Canonical Brand Image (OG):**
- https://og-image.trpc.io/api/landing?cache-buster=26
  *This is the image shown when the site is shared on social media — represents the brand visual essence.*

**Hero Image (above-fold dominant visual):**
- Aspect: 1:1 (square / portrait)
- Rendered size: 80×80px
- Alt text: "Greptile"
- *Use this aspect ratio + composition for your clone's hero — mimicking the proportion preserves the visual hierarchy.*

**Aspect Ratio Distribution:**
- Landscape (1.15–2.3): 0 (0%)
- Portrait (<0.87): 0 (0%)
- Square (0.87–1.15): 6 (100%)

**Media Format Mix:**
- PNG: 1 (logos, transparent UI elements, mockups)

**Average rendered image size:** 76×76px
**Above-fold image count:** 0 / 6

**Decorative Patterns Detected:**
- 3 multi-stop linear gradients (mesh-like, 3+ color stops) — the brand leans on rich color transitions for visual depth
- 1 radial gradient — circular color blooms used for spotlight/glow effects
- 26 background patterns (non-photo url() backgrounds) — textures/illustrations as backdrops

**Clone instruction for decorative work:** This is a gradient-rich design — invest in multi-stop CSS gradients (3+ color stops), not solid backgrounds.

**Imagery Guidance for clones:**
- Mix photography and illustration intentionally: photos for product/context, vectors for icons + decorative accents.
- Respect the format split — replacing JPGs with illustrations (or vice versa) will shift the brand tone.

## 10. Agent Prompt Guide

### Quick Reference
- Background: Pure White (`#ffffff`)
- Primary text: Near-Black (`#1c1e21`)
- Accent: Steel Blue (`#398ccb`)
- Border: Cool Gray (`#969faf`)
- Font: ui-sans-serif
- Body: 16px weight 400

### Example Component Prompts
- "Create a hero section on Pure White background (#ffffff). Headline at 48px ui-sans-serif weight 800, line-height 1, letter-spacing -1.2px, color #1c1e21."
- "Create the primary CTA button: `#398ccb` background, `#ffffff` text, 8px border-radius, 8px 16px padding, 700 weight, ui-sans-serif font."
- "Build navigation: sticky on `#ffffff`. ui-sans-serif 16px weight 400 for links."

### Iteration Guide
1. **Canvas**: Set the light canvas to Pure White (`#ffffff`) — every component is composited against this exact base.
2. **Typography**: All type in ui-sans-serif, weight range 300–800. Never exceed 800 — heavier weights break the brand's tonal restraint.
3. **Accent**: Steel Blue (`#398ccb`) is the sole interactive color. On hover → Lavender (`#c7d2fe`). Use CSS transitions, not opacity/brightness filters.
4. **Motion**: All transitions use `cubic-bezier(0.08,0.52,0.52,1)`. Timing: 200ms for micro-interactions, 200ms for layout changes. Never use linear for UI transitions — preserve the brand's easing personality.
5. **Shape**: CTAs at `0px`. Apply border-radius from the extracted scale only — don't invent intermediate values.
6. **Spacing**: Use the `--ca-space-*` token scale (4px–32px). All padding, margin, and gap values are multiples from this scale — no magic numbers.
7. **Tokens**: Import from §11 CSS Export (`--ca-*` vars). Never hardcode hex values — always reference a token so theming remains consistent.

## 11. CSS Design Tokens Raw Export

*Copy-paste ready `:root {}` block — all values extracted directly from the live site.*

```css
/* Colors */
:root {
  --ca-surface-1: #ffffff;
  --ca-surface-2: #f4f4f5;
  --ca-ink-muted: #1c1e21;
  --ca-ink-subtle: #474748;
  --ca-primary: #398ccb;
  --ca-on-primary: #111111;
  --ca-hairline: #969faf;
  --ca-semantic-error: #fd9c9f;
  --ca-semantic-success: #008b00;
  --ca-semantic-warning: #e6a700;
  --ca-semantic-info: #87d8f2;
}

/* Typography */
:root {
  --ca-font-primary: "Inter", system-ui, sans-serif;
  --ca-text-display: 48px;
  --ca-text-heading: 48px;
  --ca-text-body: 16px;
  --ca-text-small: 14px;
  --ca-text-button: 18px;
}

/* Spacing & Radius */
:root {
  --ca-space-xxs: 2px;
  --ca-space-xs: 4px;
  --ca-space-sm: 8px;
  --ca-space-md: 12px;
  --ca-space-base: 16px;
  --ca-space-lg: 24px;
  --ca-space-xl: 32px;
  --ca-space-2xl: 48px;
  --ca-space-3xl: 60px;
  --ca-radius-none: 0px;
  --ca-radius-xs: 4px;
  --ca-radius-sm: 8px;
  --ca-radius-md: 12px;
  --ca-radius-lg: 16px;
  --ca-radius-xl: 9999px;
  --ca-radius-full: 9999px;
}
```


## 13. Page Structure Skeleton

*The actual layout the source site uses. Reproduce these sections in order to match the site structure.*

```yaml
page-skeleton:
  - section: hero
    tag: div
    height: 7865px
    width: full-bleed
    layout: flex-column justify=normal
    children: 4
    vertical-padding: ~32px
  - section: header
    tag: header
    classes: ["mx-auto", "pt-12", "text-center", "lg:pt-16"]
    height: 1224px
    width: 1272px
    layout: block
    children: 3
    vertical-padding: ~48px
    padding: "96px 0px 0px"
  - section: feature-section
    tag: main
    classes: ["container", "mx-auto", "space-y-28", "px-6"]
    height: 7529px
    width: 1320px
    layout: block
    children: 8
    vertical-padding: ~72px (generous)
    padding: "0px 24px"
  - section: feature-section
    tag: div
    classes: ["main-wrapper", "mainWrapper_gJqL"]
    height: 7529px
    width: full-bleed
    layout: flex-column justify=normal
    children: 1
    bg-treatment: radial-gradient
  - section: content-section
    tag: section
    height: 352px
    width: 1272px
    layout: block
    children: 1
  - section: feature-section
    tag: section
    height: 228px
    width: 1272px
    layout: block
    children: 2
  - section: feature-section
    tag: section
    classes: ["py-4", "md:py-8"]
    height: 1313px
    width: 1272px
    layout: block
    children: 2
    vertical-padding: ~32px
    padding: "32px 0px"
  - section: content-section
    tag: div
    classes: ["code-container"]
    height: 521px
    width: 610px
    layout: block
    children: 1
    padding: "16px 0px"
  - section: unknown
    tag: div
    classes: ["code-container"]
    height: 176px
    width: 610px
    layout: block
    children: 1
    padding: "16px 0px"
  - section: unknown
    tag: div
    classes: ["code-container"]
    height: 248px
    width: 610px
    layout: block
    children: 1
    padding: "16px 0px"
  - section: feature-section
    tag: section
    classes: ["mx-auto", "hidden", "max-w-[1600px]", "md:block"]
    height: 1036px
    width: 1272px
    layout: block
    children: 3
  - section: feature-section
    tag: section
    classes: ["mx-auto", "max-w-[80ch]", "px-6", "md:px-0"]
    height: 224px
    width: 814px
    layout: block
    children: 2
  - section: feature-section
    tag: section
    height: 1384px
    width: 1272px
    layout: block
    children: 2
  - section: feature-section
    tag: section
    classes: ["pb-12"]
    height: 984px
    width: 1272px
    layout: block
    children: 2
    vertical-padding: ~24px
    padding: "0px 0px 48px"
  - section: footer
    tag: footer
    classes: ["footer"]
    height: 276px
    width: full-bleed
    layout: block
    children: 1
    bg: "rgb(245, 246, 247)"
    vertical-padding: ~32px
    padding: "32px"
  - section: logo-strip
    tag: div
    classes: ["container", "container-fluid"]
    height: 212px
    width: 1320px
    layout: block
    children: 2
    padding: "0px 16px"
```

**Agent rule**: rebuild sections in this order (sorted by vertical position). Match the layout primitive (grid N-col / flex direction / block).


## 14. Copy Library (Real Content from Source)

*Actual text content extracted from the live page. Use these strings verbatim when reproducing the site — they carry the brand voice.*

```yaml
copy:
  section-headings:
    - "SUPPORTED BY"
  sub-headings:
    - "Automatic typesafety"
    - "Alex/KATT"
  ctas:
    - "11.x"
    - "Search K"
    - "Star 40,311"
    - "Quickstart"
    - "Copy"
    - "Node.js"
    - "Use this template"
  navigation:
    - "tRPC"
    - "Star 40,311"
    - "22 more"
    - "Docs"
    - "Quickstart"
    - "Awesome tRPC Collection"
    - "Using Next.js"
    - "11.x"
  footer-links:
    - "Docs"
    - "GitHub"
```

**Agent rule**: reuse these exact strings when generating UI. Do NOT translate or rephrase — brand voice is preserved through the original wording.


## 15. Asset Inventory (Image Roles & Ratios)

*Image inventory classified by role and aspect ratio. When reproducing the site, allocate this number of assets per role.*

```yaml
assets:
  logo:
    count: 13
    avg-ratio: 3.37
    common-aspect: "~16:6 banner"
    sample-alts:
      - "Cal.com"
      - "Google"
      - "Netflix"
  thumbnail:
    count: 19
    avg-ratio: 1.00
    common-aspect: "~1:1 square"
    sample-alts:
      - "tRPC logo"
      - "Greptile"
      - "CodeRabbit"
```

**Agent rule**: when generating placeholder images, match these counts and aspect ratios. Use neutral placeholder backgrounds for `product` (e.g. `#f5f5f5`), full-color photography hints for `hero` and `editorial`.


## 16. Component HTML Templates

*Suggested HTML markup for reproducing the key components — based on what was detected in the source DOM.*

### Button (primary action)
```html
<button class="btn btn-primary">
  11.x
</button>
```
_Source pattern detected: padding `0px` · radius `0px` · weight `500`_

**Agent rule**: use these markup skeletons as the structural baseline. Apply tokens from §2-3 for visual styling.


## 17. Content Architecture & Resources (Links by Purpose)

*The page's links classified by purpose — the information architecture to reproduce. Categories, featured images, devices and projects are extracted from the rendered DOM, not guessed.*

**By purpose:** **nav** 3 · **docs** 5 · **social** 24 · **footer** 18 · **other** 10

**Projects / case studies detected** (clustered by URL + featured image):

*Trpc* — medium confidence, 4 items:

| Title | Featured image | Link |
|---|---|---|
| Star 40,311 | — | https://github.com/trpc/trpc/stargazers |
| Use this template | — | https://github.com/trpc/examples-minimal/generate |
| GitHub | — | https://github.com/trpc/trpc/tree/main |
| Trpc | — | https://github.com/trpc/trpc |

**Signals:** 28/60 links carry a featured image · dominant link roles: footer-link (24), content-card (21), inline-link (9).


---
## Extraction Completeness: 84/100 (B)

| Category | Score | Max | Detail |
|----------|-------|-----|--------|
| Colors & Palette | 25 | 25 | 21 named colors |
| Typography | 20 | 20 | 8 roles defined |
| Components | 12 | 20 | 3 specs extracted |
| Motion & Interaction | 12 | 15 | Keyframes |
| CSS Custom Properties | 10 | 10 | 377 vars |
| Responsive Breakpoints | 5 | 5 | 7 breakpoints |
| Variable Fonts | 0 | 5 | None detected |

## 12. Known Gaps & Confidence

Explicit list of what this extraction could NOT capture. Agents should not invent values for these — either skip the feature or use the documented baseline + heuristic fallback.

*Auto-detected extraction limitations — understand before building:*

- **Licensed web fonts (Inter, codicon)** — detected but not downloaded. Substitute with your licensed copy or a close fallback (see Typography section for metrics).
- **Sparse component extraction** — fewer than 5 component types detected. Highly dynamic sections (modals, datepickers, carousels) require interaction to render and are not captured in a static pass.
- **1 parasitic shadow(s) detected** — colored box-shadows (not near-black) found in allShadows. These likely originate from browser extensions or third-party injected widgets (e.g. Grammarly, chat overlays), not from the site's own design system. Discard them when building.

| Category | What's missing | Fallback strategy |
|----------|----------------|-------------------|
| **Form inputs** | No text input fields detected on this page | Use the documented border-radius + accent border on focus; 12-16px padding inside |

### Per-section confidence

| Section | Confidence | Reason |
|---------|------------|--------|
| §1 Visual Theme | High | Body bg extracted via getComputedStyle() |
| §2 Colors | High | 377 CSS vars (semantic naming requires ≥20 for high) |
| §3 Typography | High | 8 typography roles inferred |
| §4 Components | Medium | 3 component variants captured |
| §7 Motion | High | Keyframes + transitions |
| §8 Do's/Don'ts | High | 25 rules generated; design-decisions.json has evidence per rule |
| §9 Responsive | High | 7 breakpoints detected |
| §9b Photography | High | 6 images, hero present |

## 11.1 CSS Implementation Guide (CSS Interception Engine v2.15+)

*Ready-to-use CSS from Prism's CSS Interception Engine — intercepted directly from the site's CSS files (bypasses CORS). Copy-paste into your `<style>` block.*

### Font Loading

1 font file(s) captured (62KB total). When running `prism add`, fonts are saved to `extractions/trpc.io/fonts/` and embedded as base64 in the output HTML.

**@font-face declarations to use:**
```css
@font-face {
  font-family: 'Inter';
  /* src: url('/fonts/Inter.woff2') format('woff2'); */
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  /* src: url('/fonts/Inter.woff2') format('woff2'); */
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'codicon';
  /* src: url('/fonts/codicon.woff2') format('truetype'); */
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}
```

### Keyframe Animations (Intercepted from CSS)

**52 @keyframes found** — these are the real animation definitions:

```
@keyframes infinite-scroll { ... }
@keyframes loader { ... }
@keyframes pulse { ... }
@keyframes loading-spin_HK5v { ... }
@keyframes fade-in { ... }
@keyframes loading_zvTa { ... }
@keyframes spinner { ... }
@keyframes Menu-menu-fade-in-fdPFZ { ... }
@keyframes BlitzLoading-spin-JjbuM { ... }
@keyframes Confetti-makeItRain-L3HDJ { ... }
@keyframes Turnstile-skeleton-shimmer-nzFMB { ... }
@keyframes Menu-menu-fade-in-JkDrg { ... }
@keyframes PopTip-fade-in-id_SU { ... }
@keyframes BootLoader-spinner-vjPQ3 { ... }
@keyframes GithubAppRequiredDialog-rotate-H4bwf { ... }
@keyframes loading-spinner { ... }
@keyframes Toastify__trackProgress { ... }
@keyframes Toastify__bounceInRight { ... }
@keyframes Toastify__bounceOutRight { ... }
@keyframes Toastify__bounceInLeft { ... }
@keyframes Toastify__bounceOutLeft { ... }
@keyframes Toastify__bounceInUp { ... }
@keyframes Toastify__bounceOutUp { ... }
@keyframes Toastify__bounceInDown { ... }
@keyframes Toastify__bounceOutDown { ... }
@keyframes Toastify__zoomIn { ... }
@keyframes Toastify__zoomOut { ... }
@keyframes Toastify__flipIn { ... }
@keyframes Toastify__flipOut { ... }
@keyframes Toastify__slideInRight { ... }
@keyframes Toastify__slideInLeft { ... }
@keyframes Toastify__slideInUp { ... }
@keyframes Toastify__slideInDown { ... }
@keyframes Toastify__slideOutRight { ... }
@keyframes Toastify__slideOutLeft { ... }
@keyframes Toastify__slideOutDown { ... }
@keyframes Toastify__slideOutUp { ... }
@keyframes Toastify__spin { ... }
@keyframes BoltAdMenu-scale-LwIGx { ... }
@keyframes BoltAdMenu-shine-SUupp { ... }
@keyframes codicon-spin { ... }
@keyframes monaco-findInput-highlight-0 { ... }
@keyframes monaco-findInput-highlight-1 { ... }
@keyframes monaco-findInput-highlight-dark-0 { ... }
@keyframes monaco-findInput-highlight-dark-1 { ... }
@keyframes progress { ... }
@keyframes monaco-cursor-smooth { ... }
@keyframes monaco-cursor-phase { ... }
@keyframes monaco-cursor-expand { ... }
@keyframes fadein { ... }
@keyframes fadeIn { ... }
@keyframes fadeOut { ... }
```

<details><summary>Full keyframes CSS (52 animations)</summary>

```css
@keyframes infinite-scroll{0%{transform:translate(0)}
@keyframes loader{to{opacity:.1;transform:translateY(-1rem)}}
@keyframes pulse{50%{opacity:.5}}
@keyframes loading-spin_HK5v{to{transform:rotate(1turn)}}
@keyframes fade-in{0%{opacity:0}
@keyframes loading_zvTa{0%{background-position:200% 0}
@keyframes spinner{0%{transform:rotate(0turn)}
@keyframes Menu-menu-fade-in-fdPFZ{0%{opacity:0;transform:scale(.9)}
@keyframes BlitzLoading-spin-JjbuM{0%{transform:rotate(0deg)}
@keyframes Confetti-makeItRain-L3HDJ{0%{opacity:0}50%{opacity:1}
@keyframes Turnstile-skeleton-shimmer-nzFMB{0%{background-position-x:200%}
@keyframes Menu-menu-fade-in-JkDrg{0%{opacity:0;transform:scale(.9)}
@keyframes PopTip-fade-in-id_SU{0%{opacity:0}
@keyframes BootLoader-spinner-vjPQ3{0%{transform:rotate(0turn)}
@keyframes GithubAppRequiredDialog-rotate-H4bwf{to{transform:rotate(1turn)}}
@keyframes loading-spinner{0%{transform:rotate(0deg)}
@keyframes Toastify__trackProgress{0%{transform:scaleX(1)}
@keyframes Toastify__bounceInRight{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(3000px,0,0)}60%{opacity:1;transform:translate3d(-25px,0,0)}75%{transform:translate3d(10px,0,0)}90%{transform:translate3d(-5px,0,0)}
@keyframes Toastify__bounceOutRight{20%{opacity:1;transform:translate3d(-20px,0,0)}
@keyframes Toastify__bounceInLeft{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(-3000px,0,0)}60%{opacity:1;transform:translate3d(25px,0,0)}75%{transform:translate3d(-10px,0,0)}90%{transform:translate3d(5px,0,0)}
@keyframes Toastify__bounceOutLeft{20%{opacity:1;transform:translate3d(20px,0,0)}
@keyframes Toastify__bounceInUp{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(0,3000px,0)}60%{opacity:1;transform:translate3d(0,-20px,0)}75%{transform:translate3d(0,10px,0)}90%{transform:translate3d(0,-5px,0)}
@keyframes Toastify__bounceOutUp{20%{transform:translate3d(0,-10px,0)}40%,45%{opacity:1;transform:translate3d(0,20px,0)}
@keyframes Toastify__bounceInDown{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(0,-3000px,0)}60%{opacity:1;transform:translate3d(0,25px,0)}75%{transform:translate3d(0,-10px,0)}90%{transform:translate3d(0,5px,0)}
@keyframes Toastify__bounceOutDown{20%{transform:translate3d(0,10px,0)}40%,45%{opacity:1;transform:translate3d(0,-20px,0)}
@keyframes Toastify__zoomIn{0%{opacity:0;transform:scale3d(.3,.3,.3)}50%{opacity:1}}
@keyframes Toastify__zoomOut{0%{opacity:1}50%{opacity:0;transform:scale3d(.3,.3,.3)}
@keyframes Toastify__flipIn{0%{animation-timing-function:ease-in;opacity:0;transform:perspective(400px) rotateX(90deg)}40%{animation-timing-function:ease-in;transform:perspective(400px) rotateX(-20deg)}60%{opacity:1;transform:perspective(400px) rotateX(10deg)}80%{transform:perspective(400px) rotateX(-5deg)}
@keyframes Toastify__flipOut{0%{transform:perspective(400px)}30%{opacity:1;transform:perspective(400px) rotateX(-20deg)}
@keyframes Toastify__slideInRight{0%{transform:translate3d(110%,0,0);visibility:visible}
@keyframes Toastify__slideInLeft{0%{transform:translate3d(-110%,0,0);visibility:visible}
@keyframes Toastify__slideInUp{0%{transform:translate3d(0,110%,0);visibility:visible}
@keyframes Toastify__slideInDown{0%{transform:translate3d(0,-110%,0);visibility:visible}
@keyframes Toastify__slideOutRight{0%{transform:translateZ(0)}
@keyframes Toastify__slideOutLeft{0%{transform:translateZ(0)}
@keyframes Toastify__slideOutDown{0%{transform:translateZ(0)}
@keyframes Toastify__slideOutUp{0%{transform:translateZ(0)}
@keyframes Toastify__spin{0%{transform:rotate(0deg)}
@keyframes BoltAdMenu-scale-LwIGx{to{transform:scale(1.05)}}
@keyframes BoltAdMenu-shine-SUupp{0%{background-position:100%}}
@keyframes codicon-spin{to{transform:rotate(1turn)}}
@keyframes monaco-findInput-highlight-0{0%{background:rgba(253,255,0,.8)}
@keyframes monaco-findInput-highlight-1{0%{background:rgba(253,255,0,.8)}99%{background:transparent}}
@keyframes monaco-findInput-highlight-dark-0{0%{background:hsla(0,0%,100%,.44)}
@keyframes monaco-findInput-highlight-dark-1{0%{background:hsla(0,0%,100%,.44)}99%{background:transparent}}
@keyframes progress{0%{transform:translateX(0) scaleX(1)}50%{transform:translateX(2500%) scaleX(3)}
@keyframes monaco-cursor-smooth{0%,20%{opacity:1}60%,to{opacity:0}}
@keyframes monaco-cursor-phase{0%,20%{opacity:1}90%,to{opacity:0}}
@keyframes monaco-cursor-expand{0%,20%{transform:scaleY(1)}80%,to{transform:scaleY(0)}}
@keyframes fadein{0%{opacity:0;visibility:visible}
@keyframes fadeIn{0%{opacity:0}
@keyframes fadeOut{0%{opacity:1}
```
</details>

### Brand Gradient Palette

**19 complex gradients captured** from the site's CSS. The first few are the most prominent visual decorations:

```css
/* Gradient 1 */
background: linear-gradient(90deg,transparent 0,#000 128px calc(100% - 200px);

/* Gradient 2 */
background: radial-gradient(60.68% 56.71% at 50% 50%,#632d64 0,#1d1e24 100%);

/* Gradient 3 */
background: radial-gradient(59.77% 57.45% at 0 100%,#00c5f01a 0,#00c5f000 100%);

/* Gradient 4 */
background: radial-gradient(62.34% 32.09% at 100% 100%,#9d004b2b 0,#9d004b00 100%);

/* Gradient 5 */
background: radial-gradient(89.42% 88.48% at 88.48% 100%,#fa04ff9c 0,#fa04ff33 .01%,#fa04ff00 100%);

```

### Hover State CSS (Intercepted)

**4 hover rule lines** captured from CSS files. Key interactive transitions from real CSS (not inferred):

```css
a:hover{color:var(--ifm-link-hover-color);-webkit-text-decoration:var(--ifm-link-hover-decoration);text-decoration:var(--ifm-link-hover-decoration)}

.text--no-decoration,.text--no-decoration:hover{-webkit-text-decoration:none;text-decoration:none}

.alert .close:focus,.alert .close:hover{opacity:1}

.alert a:hover{text-decoration-thickness:2px}

.breadcrumbs__link:link:hover,.breadcrumbs__link:visited:hover,area[href].breadcrumbs__link:hover{background:var(--ifm-breadcrumb-item-background-active);-webkit-text-decoration:none;text-decoration:none}

.breadcrumbs__link:any-link:hover{background:var(--ifm-breadcrumb-item-background-active);-webkit-text-decoration:none;text-decoration:none}

.button:hover{color:var(--ifm-button-color);-webkit-text-decoration:none;text-decoration:none}

.button--outline:hover{--ifm-button-background-color:var(--ifm-button-border-color)}

.button--outline.button--active,.button--outline:active,.button--outline:hover{--ifm-button-color:var(--ifm-font-color-base-inverse)}

.button--link.button--active,.button--link:active,.button--link:hover{color:var(--ifm-link-hover-color);-webkit-text-decoration:var(--ifm-link-hover-decoration);text-decoration:var(--ifm-link-hover-decoration)}

.button.button--secondary.button--outline:not(.button--active):not(:hover){color:var(--ifm-font-color-base)}

:where(.button--primary):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-primary-dark);--ifm-button-border-color:var(--ifm-color-primary-dark)}

:where(.button--secondary):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-secondary-dark);--ifm-button-border-color:var(--ifm-color-secondary-dark)}

:where(.button--success):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-success-dark);--ifm-button-border-color:var(--ifm-color-success-dark)}

:where(.button--info):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-info-dark);--ifm-button-border-color:var(--ifm-color-info-dark)}

:where(.button--warning):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-warning-dark);--ifm-button-border-color:var(--ifm-color-warning-dark)}

:where(.button--danger):not(.button--outline):hover{--ifm-button-background-color:var(--ifm-color-danger-dark);--ifm-button-border-color:var(--ifm-color-danger-dark)}

.table-of-contents__link--active,.table-of-contents__link--active code,.table-of-contents__link:hover,.table-of-contents__link:hover code{color:var(--ifm-color-primary);-webkit-text-decoration:none;text-decoration:none}

.close:hover{opacity:.7}

.dropdown--hoverable:hover .dropdown__menu,.dropdown--show .dropdown__menu{opacity:1;pointer-events:all;visibility:visible;transform:translateY(-1px)}
```

> **Note**: All values above are extracted from the live site's CSS files. The font files are saved locally by Prism and embedded in the output HTML. Use them as-is for maximum fidelity.

## 11.2 Measured Reality (CDP Engine)

Captured directly from Chrome's engine across **all 2912 rendered nodes** — not a sample. These are the values the page *actually paints*, weighted by how often they appear.

### Real Responsive Breakpoints
**22 breakpoints** read from the live `@media` rules (not guessed) — 14 most relevant:
`400px` · `420px` · `460px` · `464px` · `480px` · `550px` · `576px` · `600px` · `640px` · `650px` · `768px` · `770px` · `900px` · `996px` … (+8 more)

### Measured Design Scale
**Type scale by usage** (× = paint count): `12px`×1186 · `16px`×999 · `13px`×399 · `14px`×176 · `16.8px`×57 · `30px`×32 · `18px`×25 · `24px`×15

**Radius scale** (× = paint count): `9999px`×73 · `8px`×65 · `6.4px`×17 · `3px`×15 · `4px`×8 · `2px`×7 · `12px`×7 · `2.96px`×6

**Weights** (× = paint count): `400`×2646 · `700`×192 · `500`×57 · `800`×4 · `600`×4

**Layout gaps** (× = paint count): `12px`×16 · `16px`×5 · `4px`×4 · `6px`×4 · `48px`×3 · `8px`×2 · `24px`×1 · `64px`×1

**Elevation (real shadows)**:
```css
rgb(64, 64, 64) 1px 0px 0px 0px inset
rgba(0, 0, 0, 0.1) 0px 10px 15px -3px, rgba(0, 0, 0, 0.1) 0px 4px 6px -4px
rgba(0, 0, 0, 0.1) 0px 20px 25px -5px, rgba(0, 0, 0, 0.1) 0px 8px 10px -6px
rgba(14, 165, 233, 0.2) 0px 20px 25px -5px, rgba(14, 165, 233, 0.2) 0px 8px 10px -6px
```

### Provenance — measured styles on key elements
Read from the live CSSOM (includes runtime-injected CSS). This is *what actually styles the page*, by element:

```css
nav { background-color:var(--ifm-navbar-background-color); box-shadow:var(--ifm-navbar-shadow) }
h1 { font-size:var(--ifm-h1-font-size) }
h1 { font-size:1.5rem }
h1 { font-weight:800 }
@media (min-width: 768px) h1 { font-size:1.875rem }
@media (min-width: 1024px) h1 { font-size:2.25rem }
@media (min-width: 1280px) h1 { font-size:3rem }
h2 { font-size:var(--ifm-h2-font-size) }
h2 { font-weight:700 }
h2 { font-size:1.125rem }
h2 { font-weight:800 }
button { color:inherit; font-family:inherit; font-size:100%; font-weight:inherit }
```

> Selectors normalised to their semantic element — source class names are often build-hashed (`.bgDIHX`) and not reusable. The declarations + CSS vars are the transferable part.

---
*Generated by Prism — automated Playwright extraction + design analysis.*
*Source: https://trpc.io | 2026-06-11T06:19:05.259Z*
*Values extracted via getComputedStyle() (rendered) + CSS custom properties (tokens, marked `(token)`). Token-only values may not be painted — verify against the live site before shipping.*