Canvas app design reading

Canvas App Design Reading

When the user provides a screenshot, wireframe, or reference image of a design they want to follow, Stylist reads it using this skill and produces a project-specific design-system.md. Do NOT assume a fixed template — every design reference is different and must be read fresh.

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Step 1 — Identify the layout zones

Look at the overall structure first. What are the major zones?

Common layout patterns (read which one applies — don't assume):

Pattern A: Left nav + content
[Nav] [──────────────────────]
[Nav] [  Header/Filter bar   ]
[Nav] [  Content body        ]
[Nav] [  (tiles + table)     ]

Pattern B: Top nav + content
[────────── Top Navigation ──]
[  Sidebar? ] [  Content     ]
[           ] [  (body)      ]

Pattern C: Tab navigation
[  Tab 1 | Tab 2 | Tab 3    ]
[  Content for selected tab  ]

Pattern D: Dashboard grid
[──────── Header/KPIs ───────]
[  Chart  ] [ Chart ] [Chart ]
[  Table  ──────────────────]

Pattern E: Mobile (phone format)
[  Header                    ]
[  Content scrollable        ]
[  Bottom tab bar            ]

Pattern F: Split view
[  List/sidebar  ] [ Detail  ]

Name the pattern you see. If it doesn't match any of the above, describe it in your own words in the design-system.md.

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Step 2 — Read the navigation

What navigation does the design use?

Questions to answer:

• Where is it positioned? (left, top, bottom, floating)
• What shape? (pill, rectangle, flat bar, tabs)
• How many items?
• Are there labels under icons, or icons only?
• Is there a visible active/selected state?
• Is there a role-conditional variant (compact vs full)?

Extract what you can see:

• Approximate dimensions (is it wide or narrow? tall or short?)
• Visual style: rounded corners? shadow? border?
• Icon colour and background colour (just describe — Stylist picks the colour)

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Step 3 — Read the header / top bar

Questions to answer:

• Is there a search input? What shape (pill, rectangle)?
• Is there a filter dropdown?
• Is there a reset/refresh action?
• Is there page title text?
• Does the header span full width or sit next to the nav?
• What is the approximate height of the header zone?

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Step 4 — Read the content body

Questions to answer:

• Are there summary metric tiles/cards? How many? What size relative to each other?
• Is there a data table/gallery? What columns are visible?
• Is there a detail panel or split view?
• Are there status indicators (badges, coloured chips)?
• What is the approximate proportion of tiles vs table?

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Step 5 — Identify component patterns

From the screenshot, identify visual components that are reusable:

For each distinct reusable section, note:
  - Name (what it is: navigation, search bar, metric card, data row, modal)
  - Shape (pill, rectangle, card, overlay)
  - Shadow (flat = no shadow, subtle = light shadow, elevated = strong shadow)
  - Corner radius (sharp = 0, soft = ~8px, rounded = ~15px, pill = ~25px+)
  - What controls sit inside it

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Step 6 — Note the visual style

Without deciding colours:

Attribute	Describe what you see
Overall feel	Clean/minimal? Dense/data-rich? Bold/colorful? Corporate/flat?
Surfaces	White? Light grey? Dark?
Shadows	None? Subtle? Prominent?
Corner radius	Sharp? Soft? Rounded? Pill?
Typography weight	Light? Regular? Bold headers?
Spacing	Tight? Standard? Generous?
Dominant shape	Rectangles? Rounded rects? Pills? Mixed?

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Step 7 — Write design-system.md

After reading the screenshot, produce docs/design-system.md with these sections:

# Design System — <Project Name>

## Design Reading Source
Reference: <screenshot filename or "user-provided screenshot">
Layout pattern identified: <Pattern A/B/C/D/E/F or description>

## Layout Structure
<Describe the zones in plain language>
<Include an ASCII diagram if the layout is complex>

## Navigation
- Position: <left/top/bottom>
- Shape: <pill/rectangle/tab bar/etc.>
- Items: <N icons/tabs>
- Dimensions (approximate): <W×H>
- Active state: <visible/not visible/description>

## Header / Filter Bar
- Type: <search bar / title bar / tab bar / none>
- Shape: <pill/rectangle/flat>
- Contents: <dropdown, text input, icons>
- Span: <full width / partial>

## Content Body
- Top row: <tiles? how many? relative sizing?>
- Main area: <table/gallery/cards/chart/mixed>
- Detail: <split view/modal/inline/none>

## Component Shapes
| Component | Shape | Shadow | Radius | Notes |
|---|---|---|---|---|
| Navigation | pill | subtle | 25px+ | icons overlaid on HtmlText |
| Cards | rounded rect | subtle | 15px | HtmlText background |
| Search bar | wide pill | subtle | 30px | primary colour |
| Table rows | flat | none | 0 | gallery template |

## Visual Style
- Feel: <description>
- Surfaces: <white/light/dark>
- Shadow style: <flat/subtle/elevated>
- Typography: <light/regular/bold headers>
- Spacing: <tight/standard/generous>
- Dominant shapes: <description>

## Colour Palette
[Stylist selects colours based on project brief and brand — not from screenshot]
- Primary: <to be decided>
- Background: <to be decided>
- Surface/card: <to be decided>
- Status colours: <to be decided — use standard approved/pending/rejected semantic colours>

## Component Design Tokens
[Specific RGBA values and control properties filled in by Stylist based on selected palette]

## Improvements Over Reference
[List anything the reference design is missing that should be added as standard practice]
- Empty states
- Loading indicators
- Status badges (if plain text in reference)
- Active navigation indicator (if missing)
- Hover states
- Error states

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What to do when NO screenshot is provided

If the user does not provide a screenshot or wireframe:

1. Check context/ folder for any image files
2. Ask: "Do you have a reference design or wireframe? If yes, share it and I'll match that style. If not, I'll design based on the project context and personas."
3. If no reference → make design decisions based on:
   • The project type (approval workflow → clean enterprise; consumer app → warmer, more visual)
   • The personas (office workers → professional; field workers → high contrast, large touch targets)
   • Any brand colours mentioned in the brief
   • The canvas-app-design-patterns skill for standard component patterns

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HtmlText for visual containers

When the reference design shows rounded cards, pills, or shadows — use HtmlText:

<div style='
  margin: 10px;
  width: Wpx;           /* must = Canvas control Width - 20 */
  height: Hpx;          /* must = Canvas control Height - 20 */
  background-color: [colour from design-system.md];
  box-shadow: 0 Ypx Bpx Spx rgba(0,0,0,0.12);
  border-radius: Rpx
'></div>

Shadow values by style:

• Flat (no shadow): omit box-shadow
• Subtle: 0 2px 6px 2px rgba(0,0,0,0.08)
• Standard: 0 3px 10px 5px rgba(0,0,0,0.12)
• Elevated: 0 5px 15px 5px rgba(0,0,0,0.20)

Corner radius by shape:

• Sharp: 0px
• Soft: 6-8px
• Rounded: 12-16px
• Pill: 24px+ (use half the shorter dimension for a true pill)

Interactive controls (buttons, icons) must be overlaid on HtmlText — not inside the HTML — because HtmlText cannot receive click events.