# Closing prompt box challenge — Section Design Reference

Schema: Design Details SECTION.md v3.2
Source: https://www.linearity.io/
Website: Linearity
Section ID: ff205d07-7e43-4986-95be-84aa3ab7ee5b
Design Details page: https://designdetails.io/sections/linearity-io--home--ai-ff205d07-7e43-4986-95be-84aa3ab7ee5b
Status: deterministic evidence captured; editorial AI review pending

## Purpose

This is a cta section on the Home page. Use the attached crop and measured browser facts to reconstruct its composition. Do not infer unmeasured source values.

## Layout

1440×584px root; block

## Visual signature

gradient, typographic, bold, colourful, dark-mode, glassmorphism treatment at 1440×585px. The crop spans 27752–28337px of a 29622px page.

## Components

- Navigation Bar
- Hero
- Product UI
- Feature Card
- Gallery
- Primary Button
- Outline Button
- Footer
- Bento Grid Mockups
- Interactive Tag List

## Evidence note

The geometry, typography, colors, media, and animation parameters below come from saved HTML/CSS/browser evidence when present. Website-level roles are supplied separately. Editorial section judgment remains pending unless the MCP resolves this source ID to a promoted canonical record.

## Build blueprint v3.2

### Purpose and classification

- Canonical type: cta
- Source type: cta
- Structure: 1440×584px root; block
- Layout: 1440×584px root; block
- Styles: gradient, typographic, bold, colourful, dark-mode, glassmorphism
- Components: Navigation Bar, Hero, Product UI, Feature Card, Gallery, Primary Button, Outline Button, Footer, Bento Grid Mockups, Interactive Tag List
- Purpose: cta section from the Home page of Linearity.
- Visual signature: rgba(0, 0, 0, 0) with 1440×584px root; block. Inspect the crop for image and content hierarchy.
- Place on the page: 10 of 11, after FAQ (`linearity-io:faq_and_bottom_cta`), before Footer (`linearity-io:footer_large_logo`)

### Crop and composition

- Crop: 1440×585px; aspect ratio 2.462:1
- Page bounds: 27752–28337px of 29622px
- Guidance: Preserve the documented hierarchy and relationships; exact measurements were not deterministically captured.

### Exact typography evidence

The sectionScale values were measured inside this crop. The siteRoles values explain how those faces function across the source website; they must not replace section measurements.

```json
{
  "sectionScale": [
    {
      "role": "section heading",
      "family": "AcidGrotesk",
      "stack": "AcidGrotesk, AcidGroteskSubset, sans-serif",
      "size": "75.4px",
      "weight": "400",
      "lineHeight": "75.4px",
      "letterSpacing": "-0.8px",
      "sample": "One prompt, every marketing asset.",
      "element": "span",
      "occurrences": 1,
      "sourceId": "font-22"
    }
  ],
  "siteRoles": [
    {
      "role": "display",
      "size": "75.4px",
      "family": "AcidGrotesk",
      "source": "computed",
      "traits": "Regular",
      "weight": "400",
      "evidence": "font-22: computed CSS at 1440×1000; AI role: AcidGrotesk at 75.4px with tight letter-spacing (-0.8px) for major impactful statements.",
      "sampleId": "font-22",
      "confidence": 1,
      "lineHeight": "75.4px",
      "letterSpacing": "-0.8px"
    },
    {
      "role": "heading",
      "size": "34.3px",
      "family": "AcidGrotesk",
      "source": "computed",
      "traits": "Regular",
      "weight": "500",
      "evidence": "font-19: computed CSS at 1440×1000; AI role: AcidGrotesk at 34.3px used for section headers and the hero text cycle.",
      "sampleId": "font-19",
      "confidence": 0.95,
      "lineHeight": "39.8px",
      "letterSpacing": "-0.3px"
    },
    {
      "role": "body",
      "size": "13.7px",
      "family": "Inter",
      "source": "computed",
      "traits": "Regular",
      "weight": "400",
      "evidence": "font-6: computed CSS at 1440×1000; AI role: Inter at 13.7px used for standard descriptive paragraphs.",
      "sampleId": "font-6",
      "confidence": 1,
      "lineHeight": "20.6px",
      "letterSpacing": "normal"
    },
    {
      "role": "mono",
      "size": "10.3px",
      "family": "Inter",
      "source": "computed",
      "traits": "uppercase",
      "weight": "500",
      "evidence": "font-8: computed CSS at 1440×1000; AI role: Inter at 10.3px, uppercase with 2.3px letter-spacing, functioning as eyebrows and small labels.",
      "sampleId": "font-8",
      "confidence": 0.85,
      "lineHeight": "14.4px",
      "letterSpacing": "2.3px"
    }
  ]
}
```

### Exact color evidence

The section samples record where each computed value was used. Functional roles come from the website-level classifier and remain separate.

```json
{
  "sectionUsage": [
    {
      "value": "#FFFFFF",
      "cssValue": "rgba(255, 255, 255, 0.55)",
      "alpha": 0.5490196078431373,
      "appliedAs": [
        "text"
      ],
      "occurrences": 11,
      "sourceId": "color-13"
    }
  ],
  "functionalPalette": [
    {
      "hex": "#000000",
      "name": "canvas",
      "role": "canvas",
      "source": "computed",
      "evidence": "color-1: computed rgb(0, 0, 0); AI role: Pure black #000000 used as the primary background color for the page body.",
      "sampleId": "color-1",
      "confidence": 1
    },
    {
      "hex": "#FFFFFF",
      "name": "text",
      "role": "text",
      "source": "computed",
      "evidence": "color-2: computed rgb(255, 255, 255); AI role: Solid white #FFFFFF used for primary headings and body copy.",
      "sampleId": "color-2",
      "confidence": 1
    },
    {
      "hex": "#FF4800",
      "name": "primary action",
      "role": "primary-action",
      "source": "computed",
      "evidence": "color-17: computed rgb(255, 72, 0); AI role: #FF4800 used for prominent 'Contact sales' buttons and active states.",
      "sampleId": "color-17",
      "confidence": 0.95
    }
  ]
}
```

### Design tokens

```json
{
  "radius": "Buttons and badges use max radius (border-radius: 9999px equivalents), while product UI mockups use consistent, large, smooth radii.",
  "density": "Loose and airy, prioritizing visual impact and large typography over high information density.",
  "evidence": "Observed via DOM structures for buttons (.pill-shape), computed styles for background colors, and padding/margin layout patterns across sections.",
  "borderStyle": "Hairline (1px), translucent white borders on dark elements to create depth without solid lines.",
  "buttonStyle": "Pill-shaped, either solid high-contrast (orange) or glassmorphic (dark translucent with white text/border).",
  "cornerStyle": "Distinctively dual-natured: fully rounded (pill-shaped) for interactive elements like buttons and tags, and heavily rounded rectangles (e.g., 16-24px) for cards and UI mockups.",
  "contentWidth": "Content is typically centered in a max-width container, though background effects and parallax grids bleed to the edges.",
  "spacingRhythm": "Generous vertical rhythm with large gaps between sections to allow background gradients to show. Content blocks are padded with ample negative space."
}
```

### Reconstruction specification

This is the implementation contract for the captured desktop viewport. Prefer section-specific facts here over general website descriptions.

- Root: 1440×584px; block; padding {"top":"102.857px","right":"0px","bottom":"102.857px","left":"0px"}; gap normal; background rgba(0, 0, 0, 0); radius 0px.
- Observed gaps: 3.4px.
- Representative content widths: 1035, 793, 462, 414, 244px.
- Layout containers: 0; cards/surfaces: 0; media elements: 1; browser animations: 0.

#### Container, grid, and spacing

```json
{
  "viewport": {
    "width": 1440,
    "captureBounds": {
      "top": 27704,
      "bottom": 28322,
      "pageHeight": 29622
    }
  },
  "container": {
    "size": "1440×584px",
    "position": "x 0px, y 27753px",
    "display": "block",
    "positionMode": "relative",
    "padding": {
      "top": "102.857px",
      "right": "0px",
      "bottom": "102.857px",
      "left": "0px"
    },
    "margin": {
      "top": "0px",
      "right": "0px",
      "bottom": "0px",
      "left": "0px"
    },
    "gap": "normal",
    "columns": "not captured",
    "background": "rgba(0, 0, 0, 0)",
    "radius": "0px",
    "border": "0px solid rgb(255, 255, 255)",
    "shadow": "none",
    "overflow": "clip visible"
  },
  "spacing": {
    "observedGapsPx": [
      3.4
    ],
    "representativeContentWidthsPx": [
      1035,
      793,
      462,
      414,
      244
    ]
  },
  "columns": []
}
```

#### Cards and surfaces

```json
{
  "cards": [],
  "surfaces": {
    "radii": [
      "9999px"
    ],
    "borders": [],
    "shadows": [
      "rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(255, 94, 35, 0.4) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px"
    ]
  }
}
```

#### Media treatment

```json
[
  {
    "element": "svg · svg",
    "size": "14×24px",
    "position": "x 929px, y 28192px",
    "aspectRatio": 0.6,
    "objectFit": "fill",
    "objectPosition": "50% 50%",
    "radius": "0px",
    "overflow": "hidden",
    "source": "source not captured"
  }
]
```

#### Browser-exposed animation parameters

```json
[]
```

### Measured geometry, surfaces, media, and animation

These raw values come from the saved element map and computed styles. Empty arrays mean the fact was not captured; they are not permission to invent source values.

```json
{
  "schema": "little-details-section-measurements-v1",
  "source": "saved DOM/CSS element and animation maps",
  "capturedAt": "2026-09-24T19:12:29.723Z",
  "viewportWidth": 1440,
  "bounds": {
    "top": 27704,
    "bottom": 28322,
    "pageHeight": 29622
  },
  "root": {
    "id": "ld-3427",
    "tag": "section",
    "role": null,
    "label": "One prompt, every marketing asset.Don't take our word for it. Prove us wrong. Type a prompt.Give me ",
    "rect": {
      "x": 0,
      "y": 27753,
      "width": 1440,
      "height": 584
    },
    "display": "block",
    "position": "relative",
    "padding": {
      "top": "102.857px",
      "right": "0px",
      "bottom": "102.857px",
      "left": "0px"
    },
    "margin": {
      "top": "0px",
      "right": "0px",
      "bottom": "0px",
      "left": "0px"
    },
    "gap": "normal",
    "columns": null,
    "background": "rgba(0, 0, 0, 0)",
    "radius": "0px",
    "border": "0px solid rgb(255, 255, 255)",
    "shadow": "none",
    "overflow": "clip visible"
  },
  "spacing": {
    "gapsPx": [
      3.4
    ],
    "representativeContentWidthsPx": [
      1035,
      793,
      462,
      414,
      244
    ]
  },
  "columns": [],
  "cards": [],
  "surfaces": {
    "radii": [
      "9999px"
    ],
    "borders": [],
    "shadows": [
      "rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(255, 94, 35, 0.4) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px"
    ]
  },
  "media": [
    {
      "id": "ld-3454",
      "tag": "svg",
      "role": null,
      "label": "svg",
      "rect": {
        "x": 929,
        "y": 28192,
        "width": 14,
        "height": 24
      },
      "aspectRatio": 0.6,
      "objectFit": "fill",
      "objectPosition": "50% 50%",
      "radius": "0px",
      "overflow": "hidden",
      "media": null
    }
  ],
  "animations": [],
  "coverage": {
    "elementsInSection": 11,
    "cards": 0,
    "media": 1,
    "animations": 0
  },
  "limitations": [
    "Values describe the captured desktop viewport and may change at other breakpoints.",
    "Transforms, sticky layers, and virtualized content can make the inferred section root approximate.",
    "Animations include browser-exposed Web Animations API state; CSS or script motion that was inactive at capture time may be absent."
  ]
}
```

### Observed motion

No timestamped authored motion is attached. Use only restrained baseline transitions.

The browser animation records above are deterministic parameters captured from active browser animations. The timestamped observations describe what Gemini saw in the video. Treat them as complementary evidence. When either source is empty or they conflict, state the uncertainty instead of inventing timing or easing.

### Responsive contract

- Measured viewport: 1440px wide.
- Mobile/tablet values: not measured by this section evidence unless a separate capture is explicitly listed.
- Preserve hierarchy and sequence; collapse simultaneous columns only where needed, maintain media aspect ratios, and verify touch targets and text wrapping at target breakpoints.

### Structure versus visual skin

- Preserve: content hierarchy, layout relationships, section rhythm, interaction purpose.
- Adapt: brand colors, font family, copy, imagery, icons, decorative details.
- Rule: Preserve the observed design logic while creating original branding, copy, assets, and implementation details.

### Adaptation and dependencies

- Effort: Not assessed
- What transfers: Documented hierarchy and composition
- Dependencies: None recorded
- Guidance: Adapt the pattern to the new product and content.

### Evidence readiness

- Coverage: 7/7
- Can build: Yes
- Missing facts: timestamped authored motion
- Warning: Buildable with adaptations for these unsupported facts: timestamped authored motion.

### Agent implementation prompt

Create an original cta section inspired by the design evidence titled “Closing prompt box challenge”.

Purpose: cta section from the Home page of Linearity.

Structure: 1440×584px root; block. Source layout label: 1440×584px root; block. Preserve the documented hierarchy and relationships; exact measurements were not deterministically captured.

Visual signature to preserve at the pattern level: rgba(0, 0, 0, 0) with 1440×584px root; block. Inspect the crop for image and content hierarchy.

Components: Navigation Bar, Hero, Product UI, Feature Card, Gallery, Primary Button, Outline Button, Footer, Bento Grid Mockups, Interactive Tag List.

Style direction: gradient, typographic, bold, colourful, dark-mode, glassmorphism.

Observed crop: 1440×585px (2.462:1). Treat this as evidence of composition, not a mandatory output size.

Typography evidence: {"role":"display","size":"75.4px","family":"AcidGrotesk","source":"computed","traits":"Regular","weight":"400","evidence":"font-22: computed CSS at 1440×1000; AI role: AcidGrotesk at 75.4px with tight letter-spacing (-0.8px) for major impactful statements.","sampleId":"font-22","confidence":1,"lineHeight":"75.4px","letterSpacing":"-0.8px"} {"role":"heading","size":"34.3px","family":"AcidGrotesk","source":"computed","traits":"Regular","weight":"500","evidence":"font-19: computed CSS at 1440×1000; AI role: AcidGrotesk at 34.3px used for section headers and the hero text cycle.","sampleId":"font-19","confidence":0.95,"lineHeight":"39.8px","letterSpacing":"-0.3px"} {"role":"body","size":"13.7px","family":"Inter","source":"computed","traits":"Regular","weight":"400","evidence":"font-6: computed CSS at 1440×1000; AI role: Inter at 13.7px used for standard descriptive paragraphs.","sampleId":"font-6","confidence":1,"lineHeight":"20.6px","letterSpacing":"normal"} {"role":"mono","size":"10.3px","family":"Inter","source":"computed","traits":"uppercase","weight":"500","evidence":"font-8: computed CSS at 1440×1000; AI role: Inter at 10.3px, uppercase with 2.3px letter-spacing, functioning as eyebrows and small labels.","sampleId":"font-8","confidence":0.85,"lineHeight":"14.4px","letterSpacing":"2.3px"}

Color evidence: {"hex":"#000000","name":"canvas","role":"canvas","source":"computed","evidence":"color-1: computed rgb(0, 0, 0); AI role: Pure black #000000 used as the primary background color for the page body.","sampleId":"color-1","confidence":1} {"hex":"#FFFFFF","name":"text","role":"text","source":"computed","evidence":"color-2: computed rgb(255, 255, 255); AI role: Solid white #FFFFFF used for primary headings and body copy.","sampleId":"color-2","confidence":1} {"hex":"#FF4800","name":"primary action","role":"primary-action","source":"computed","evidence":"color-17: computed rgb(255, 72, 0); AI role: #FF4800 used for prominent 'Contact sales' buttons and active states.","sampleId":"color-17","confidence":0.95}

Typography measured inside this section: {"id":"font-22","family":"AcidGrotesk","fontStack":"AcidGrotesk, AcidGroteskSubset, sans-serif","weight":"400","size":"75.4px","lineHeight":"75.4px","letterSpacing":"-0.8px","traits":"Regular","count":1,"contexts":[{"tag":"span","text":"One prompt, every marketing asset.","top":27840,"property":"font"}]}

Colors measured inside this section: {"id":"color-13","hex":"#FFFFFF","alpha":0.5490196078431373,"cssValue":"rgba(255, 255, 255, 0.55)","count":11,"contexts":[{"tag":"p","text":"Turn a simple prompt into polished visual directions, then refine the layout, colors, typography, an","top":590,"property":"text"},{"tag":"button","text":"Monthly","top":26055,"property":"text"},{"tag":"span","text":"Don't take our word for it. Prove us wrong. Type a prompt.","top":28017,"property":"text"}]}

Exact section measurements from the saved element map: root {"rect":{"x":0,"y":27753,"width":1440,"height":584},"padding":{"top":"102.857px","right":"0px","bottom":"102.857px","left":"0px"},"gap":"normal","columns":null,"overflow":"clip visible"}; spacing {"gapsPx":[3.4],"representativeContentWidthsPx":[1035,793,462,414,244]}; surfaces {"radii":["9999px"],"borders":[],"shadows":["rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(255, 94, 35, 0.4) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px"]}; media [{"tag":"svg","rect":{"x":929,"y":28192,"width":14,"height":24},"aspectRatio":0.6,"objectFit":"fill","objectPosition":"50% 50%","radius":"0px"}]

Do not invent signature motion. Use only restrained baseline transitions if the product needs them.

Transfer the documented hierarchy and composition rather than source copy or assets.

No explicit dependencies were recorded.

Adapt the pattern to the new product and content.

Use new copy, imagery, branding, and implementation details. Do not reproduce the source website or its proprietary assets.