# DESIGN.md: Fly.io-style design system

Measured from https://fly.io/ on 2026-10-15 by PikSpec (https://www.pikspec.com). An independent measurement of the rendered page, not Fly.io's official design system, and not affiliated with Fly.io.

Use it to build your own product in this design language: put this file in your project root and tell your AI tool (Claude Code, Cursor, Codex, Lovable, v0) to follow DESIGN.md. Never use the original's name, logo, copy or images; licensed fonts are replaced with the closest free Google Fonts.

To capture any other page, or get a ready project for your tool: https://www.pikspec.com/build-with-ai

HOW IT SHOULD LOOK
Build it in the design language of fly.io, measured from the live site: it should feel designed by the same team as fly.io — the same temperament, colour, type and density — for a different product. Never use fly.io's name, logo, words or images.

Stack: use the one your project already has. Starting fresh: React + Vite + TypeScript + Tailwind CSS v4, with no UI kit (no shadcn/ui, MUI or Chakra) — their defaults would override this system. In a chat that shows one file (an artifact or canvas), build one HTML file instead, with the tokens below in its <style> block.
Use every value exactly as written. Do not round, rename, approximate or substitute a colour, size, radius, shadow or easing (fonts: see section 1). Anything not listed here does not exist in this system.

THE WEBSITE THIS SYSTEM COMES FROM
- Reference page: https://fly.io/ — "fly.io" (home page).
- Page frame: a top navigation bar and a footer.
- Content is grouped in cards (7 on the page, up to 3 side by side). Keep cards for grouped content only, not for every section.
- It uses 27 images, 21 of them large. Large, real product imagery is part of the look — leave clearly labelled image slots at those sizes rather than stock photos or abstract 3D shapes.
- Interaction: 11 buttons and 2 form fields on one page.
- The page runs about 9 screens long at 1440px wide.
- Density is low: few elements per screen, generous space around each one.

HOW IT LOOKS (WHAT MAKES IT LOOK LIKE ITSELF, BEYOND THE VALUES)
- Almost entirely neutral: 99% of the page is painted in #FFFFFF and #F4F6EB.
- #7C3AED is an accent: 0.4% of the page, as small fills such as buttons and badges. Keep it to small areas.
- #6EE7B7 is an accent: 0.1% of the page, used for text only. Don't fill large areas with it.
- The largest type (72px Mackinac) is medium weight, not bold (500), tracked to -0.02em.
- Open: text covers 10% of the page. Sections sit about 96px apart.
- Structure comes from thin grid lines, not from shadows or filled cards.
- Share of the painted page: #FFFFFF 77.1% (dominant, backgrounds); #F4F6EB 5.8% (supporting, backgrounds); #F4F3FB 5.5% (supporting, backgrounds); #191034 4.3% (supporting, backgrounds); #686082 3.3% (supporting, text); #000000 2.4% (supporting, text); #2E2E2E 0.5% (detail, text); #7C3AED 0.4% (accent, backgrounds and text). Keep accents at these proportions; do not promote them to fills.
- Hairline grid: 1px lines in #D5CFEF run both across and down the page (45 across, 38 down), dividing it into cells instead of cards.
- Large images: Photographs, video or raster artwork cover about 71% of the page.
- Type as set (size, weight and tracking measured together; use these pairs): 72px weight 500 tracking -0.02em; 48px weight 500 tracking -0.025em; 36px weight 500 tracking -0.02em; 24px weight 500 tracking -0.02em; 20.5px weight 325; 19px weight 325.

1. DESIGN TOKENS — PASTE INTO YOUR GLOBAL CSS
Allowed colours, with how the original uses each. Use no other colour, including in hover states:
- #FFFFFF — 77.1% · backgrounds (var(--color-surface))
- #F4F6EB — 5.8% · backgrounds (var(--color-background))
- #F4F3FB — 5.5% · backgrounds (var(--color-f4f3fb))
- #191034 — 4.3% · backgrounds (var(--color-191034))
- #686082 — 3.3% · text (var(--color-text))
- #000000 — 2.4% · text
- #2E2E2E — 0.5% · text
- #7C3AED — 0.4% · backgrounds, text (var(--color-action))
- #A39AC1 — 0.2% · text
- #D5CFEF — 0.2% · lines (var(--color-border))
- #E6E0FE — hairlines and grid lines
- #42385F — hairlines and grid lines
- #D4C4FD — hairlines and grid lines
- #281950 — Link (var(--color-link))
- #6EE7B7 — Positive (var(--color-positive))
Fonts — put these first in your global CSS (one import per font, so one that fails cannot stop the others):
```css
@import url("https://fonts.googleapis.com/css2?family=Figtree:wght@300;500;600&display=swap");
```
Font: fly.io uses Fricolage Grotesque (body) and Mackinac (display) — its own licensed faces, not available to download. This kit uses Figtree for body and display, the closest free match, already in the tokens. If you own the original, add it with @font-face and it is used first; to use another font, change the --font-* variables.
Keep every size, weight, line height and tracking exactly as listed whichever font renders.
```css
:root {
  --color-background: #F4F6EB; /* Background */
  --color-surface: #FFFFFF; /* Surface */
  --color-text: #686082; /* Text */
  --color-border: #D5CFEF; /* Border */
  --color-action: #7C3AED; /* Action */
  --color-on-action: #FFFFFF; /* On action */
  --color-link: #281950; /* Link */
  --color-positive: #6EE7B7; /* Positive */
  --color-f4f3fb: #F4F3FB; /* 5.5% of the page, as fills */
  --color-191034: #191034; /* 4.3% of the page, as fills */
  --font-body: "Fricolage Grotesque", "Figtree", sans-serif; /* Fricolage Grotesque on the site; Figtree renders */
  --font-display: "Mackinac", "Figtree", sans-serif; /* Mackinac on the site; Figtree renders */
  --type-display-large: 72px; /* Display Large, weight 500 */
  --type-display-large-leading: 68.4px;
  --type-display-large-tracking: -0.02em;
  --type-display-medium: 48px; /* Display Medium, weight 500 */
  --type-display-medium-leading: 60px;
  --type-display-medium-tracking: -0.025em;
  --type-display-small: 36px; /* Display Small, weight 500 */
  --type-display-small-leading: 41.4px;
  --type-display-small-tracking: -0.02em;
  --type-headline: 24px; /* Headline, weight 500 */
  --type-headline-leading: 27.6px;
  --type-headline-tracking: -0.02em;
  --type-title-large: 20.5px; /* Title Large, weight 325 */
  --type-title-large-leading: 27.675px;
  --type-title-small: 19px; /* Title Small, weight 325 */
  --type-title-small-leading: 28.5px;
  --type-body-1: 17px; /* Body 1, weight 325 */
  --type-body-1-leading: 25.5px;
  --type-body-2: 16px; /* Body 2, weight 325 */
  --type-body-2-leading: 24px;
  --type-body-3: 15.5px; /* Body 3, weight 450 */
  --type-body-3-leading: 23.25px;
  --type-body-4: 15px; /* Body 4, weight 450 */
  --type-body-4-leading: 22.5px;
  --type-body-5: 14.5px; /* Body 5, weight 450 */
  --type-body-5-leading: 24px;
  --type-label: 12px; /* Label, weight 575 */
  --type-label-leading: 18px;
  --type-label-tracking: 0.05em;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-25: 100px;
  --space-30: 120px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 10px;
  --radius-2xl: 16px;
  --radius-3xl: 20px;
  --radius-full: 9999px;
  --elevation-1: rgba(221, 214, 254, 0.25) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px;
  --elevation-2: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(36, 23, 91, 0.01) 0px 0.255444px 0px 0px, rgba(36, 23, 91, 0.09) 0px 2.55444px 7.15244px -4.08711px;
  --elevation-3: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.1) 0px 2px 25px 0px;
  --elevation-4: rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(255, 255, 255, 0.3) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0.2) 0px 10px 15px -3px, rgba(0, 0, 0, 0.2) 0px 4px 6px -4px;
  --duration-1: 0.1s;
  --duration-2: 0.15s;
  --duration-3: 0.2s;
  --duration-4: 0.3s;
  --ease-1: cubic-bezier(0, 0, 0.2, 1);
  --ease-2: cubic-bezier(0.4, 0, 0.2, 1);
}
```
Tailwind CSS v4 (the default for new projects): put this after `@import "tailwindcss";`. It removes Tailwind's own palette, so only these colours exist as utilities:
```css
@theme {
  --color-*: initial;
  --color-background: #F4F6EB;
  --color-surface: #FFFFFF;
  --color-text: #686082;
  --color-border: #D5CFEF;
  --color-action: #7C3AED;
  --color-on-action: #FFFFFF;
  --color-link: #281950;
  --color-positive: #6EE7B7;
  --color-f4f3fb: #F4F3FB;
  --color-191034: #191034;
  --font-body: "Fricolage Grotesque", "Figtree", sans-serif;
  --font-display: "Mackinac", "Figtree", sans-serif;
  --text-display-large: 72px;
  --text-display-large--line-height: 68.4px;
  --text-display-large--letter-spacing: -0.02em;
  --text-display-medium: 48px;
  --text-display-medium--line-height: 60px;
  --text-display-medium--letter-spacing: -0.025em;
  --text-display-small: 36px;
  --text-display-small--line-height: 41.4px;
  --text-display-small--letter-spacing: -0.02em;
  --text-headline: 24px;
  --text-headline--line-height: 27.6px;
  --text-headline--letter-spacing: -0.02em;
  --text-title-large: 20.5px;
  --text-title-large--line-height: 27.675px;
  --text-title-small: 19px;
  --text-title-small--line-height: 28.5px;
  --text-body-1: 17px;
  --text-body-1--line-height: 25.5px;
  --text-body-2: 16px;
  --text-body-2--line-height: 24px;
  --text-body-3: 15.5px;
  --text-body-3--line-height: 23.25px;
  --text-body-4: 15px;
  --text-body-4--line-height: 22.5px;
  --text-body-5: 14.5px;
  --text-body-5--line-height: 24px;
  --text-label: 12px;
  --text-label--line-height: 18px;
  --text-label--letter-spacing: 0.05em;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 10px;
  --radius-2xl: 16px;
  --radius-3xl: 20px;
  --radius-full: 9999px;
  --shadow-e1: rgba(221, 214, 254, 0.25) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px;
  --shadow-e2: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(36, 23, 91, 0.01) 0px 0.255444px 0px 0px, rgba(36, 23, 91, 0.09) 0px 2.55444px 7.15244px -4.08711px;
  --shadow-e3: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.1) 0px 2px 25px 0px;
  --shadow-e4: rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(255, 255, 255, 0.3) 0px 0px 0px 1px inset, rgba(0, 0, 0, 0.2) 0px 10px 15px -3px, rgba(0, 0, 0, 0.2) 0px 4px 6px -4px;
  --ease-1: cubic-bezier(0, 0, 0.2, 1);
  --ease-2: cubic-bezier(0.4, 0, 0.2, 1);
}
```
Tailwind CSS v3 only: extend the theme with these instead, and use no other palette:
```js
// tailwind.config — theme.extend
{
  colors: { "background": "var(--color-background)", "surface": "var(--color-surface)", "text": "var(--color-text)", "border": "var(--color-border)", "action": "var(--color-action)", "on-action": "var(--color-on-action)", "link": "var(--color-link)", "positive": "var(--color-positive)" },
  fontFamily: { "body": ["var(--font-body)"], "display": ["var(--font-display)"] },
  borderRadius: { "md": "var(--radius-md)", "lg": "var(--radius-lg)", "xl": "var(--radius-xl)", "2xl": "var(--radius-2xl)", "3xl": "var(--radius-3xl)", "full": "var(--radius-full)" },
  boxShadow: { "e1": "var(--elevation-1)", "e2": "var(--elevation-2)", "e3": "var(--elevation-3)", "e4": "var(--elevation-4)" },
}
```

2. BASE STYLES
```css
html { background: var(--color-background); }
body { margin: 0; font-family: var(--font-body); color: var(--color-text); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; }
a { color: var(--color-link); }
:focus-visible { outline: 2px solid var(--color-action); outline-offset: 2px; }
```

3. COMPONENTS — MATCH THESE EXACTLY
```css
.card { /* Default */
  background: var(--color-f4f3fb);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  min-height: 488px;
  color: var(--color-link);
  font-family: var(--font-body);
  font-size: var(--type-body-2);
  font-weight: 325;
  line-height: 24px;
}
.card-2 { /* Alternative 1 */
  background: var(--color-surface);
  border-radius: var(--radius-3xl);
  padding: 0px 100px 0px 100px;
  min-height: 300px;
  color: var(--color-link);
  font-family: var(--font-body);
  font-size: var(--type-body-2);
  font-weight: 325;
  line-height: 24px;
}
.card-3 { /* Alternative 2 */
  background: var(--color-f4f3fb);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  min-height: 300px;
  color: var(--color-link);
  font-family: var(--font-body);
  font-size: var(--type-body-2);
  font-weight: 325;
  line-height: 24px;
}
.link { /* Inline */
  background: transparent;
  padding: 10px 12px 10px 12px;
  min-height: 42px;
  color: var(--color-link);
  font-family: var(--font-body);
  font-size: var(--type-body-5);
  font-weight: 500;
  line-height: 21.75px;
  /* recorded states: hover, focus */
}
.link-2 { /* Inline 2 */
  background: transparent;
  min-height: 29px;
  color: #7C3AED;
  font-family: var(--font-body);
  font-size: var(--type-title-small);
  font-weight: 450;
  line-height: 28.5px;
  /* recorded states: hover */
}
.link-3 { /* Inline 3 */
  background: transparent;
  padding: 10px 12px 10px 12px;
  min-height: 46px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--type-body-1);
  font-weight: 450;
  line-height: 25.5px;
  /* recorded states: hover */
}
.nav { /* Default */
  background: transparent;
  min-height: 46px;
  color: var(--color-link);
  font-family: var(--font-body);
  font-size: var(--type-body-5);
  font-weight: 450;
  line-height: 21.75px;
}
.button { /* Primary */
  background: var(--color-action);
  border-radius: var(--radius-full);
  min-height: 48px;
  color: var(--color-on-action);
  font-family: var(--font-body);
  font-size: var(--type-body-2);
  font-weight: 325;
  line-height: 24px;
  /* recorded states: hover, focus-visible */
}
.button-2 { /* Secondary */
  background: var(--color-action);
  border-radius: var(--radius-lg);
  padding: 0px 20px 0px 20px;
  min-height: 48px;
  box-shadow: var(--elevation-1);
  color: var(--color-on-action);
  font-family: var(--font-body);
  font-size: var(--type-body-3);
  font-weight: 450;
  line-height: 23.25px;
  /* recorded states: hover, focus, disabled */
}
.button-3 { /* Secondary 2 */
  background: var(--color-action);
  border-radius: var(--radius-lg);
  padding: 8px 16px 8px 16px;
  min-height: 38px;
  color: var(--color-on-action);
  font-family: var(--font-body);
  font-size: var(--type-body-5);
  font-weight: 450;
  line-height: 21.75px;
  /* recorded states: hover */
}
.input { /* Default */
  background: var(--color-191034);
  border: 1px solid #42385F;
  border-radius: var(--radius-lg);
  padding: 8px 12px 8px 12px;
  min-height: 40px;
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: var(--type-body-5);
  font-weight: 325;
  line-height: 21.75px;
  /* recorded states: focus */
}
```
Where a component lists recorded states, write those states using only the colours above; the capture saw that the state exists, not its values. Never invent a state colour.

4. PAGE COMPOSITION
- Light interface on #F4F6EB. Keep that ground; do not add a dark mode.
- The opening screen carries a large image or video behind or across the heading. Leave a [content: hero image or video] slot there, at least half the screen wide; the opening is not text alone.
- Sections change ground between Surface (#FFFFFF) and #191034; use only those.
- #7C3AED is the action colour. Fill the primary action with it and little else — at most one #7C3AED-filled element per screen; other accents keep to the uses listed above.
- Type: Figtree (standing in for Fricolage Grotesque) for body; Figtree (standing in for Mackinac) for display. Hierarchy comes from size and weight, not colour or decoration.
- Everything sits on a 4px grid.
- Corner radii are 6px, 8px, 10px, 16px, 20px, fully round (pill) — nothing else.
- Body text uses Fricolage Grotesque at around 16px, weights 325, 450, 500, 575.
- Headings use Mackinac; the largest heading is 72px.
- Primary buttons are #7C3AED, 8px radius, weight 450.
- Cards use square corners with a soft shadow.
- Corner radii in use: 8px, 10px, 20px, 16px, 9999px (pill).

HOW THE ORIGINAL PACES ITS PAGE (BORROW THE RHYTHM — THE OPENING, THE COLOURED BANDS, THE CARD GRIDS — NOT THE LIST; BUILD THE SECTIONS YOUR PRODUCT NEEDS)
1. Hero — 692px tall, left-aligned 72px heading (weight 500), image behind the content, on #F4F6EB.
2. Text — 146px tall, left-aligned 17px heading (weight 575).
3. Split — 755px tall, 2 equal columns, 16px gap, centred 36px heading (weight 500), full-width image.
4. Text — 396px tall, left-aligned 36px heading (weight 500), image on the right.
5. Cards — 1002px tall, split 3 / 3 / 2 / 2 / 2, left-aligned 36px heading (weight 500), image behind the content.
6. Split — 355px tall, split 5 / 7, 64px gap, left-aligned 36px heading (weight 500).
7. Cards — 1027px tall, 3 equal columns, 24px gap, left-aligned 36px heading (weight 500), image behind the content.
8. Split — 340px tall, split 7 / 5, 100px gap, left-aligned 36px heading (weight 500).
9. Cards — 1152px tall, 3 equal columns, 24px gap, left-aligned 36px heading (weight 500), image behind the content.
10. Cards — 1044px tall, 3 equal columns, 16px gap, centred 36px heading (weight 500), image behind the content.
11. Split — 312px tall, split 9 / 3, 259px gap, left-aligned 48px heading (weight 500), image behind the content, on an image background.
12. Footer — 479px tall, split 2 / 3 / 2 / 5, 108px gap, left-aligned 14.5px heading (weight 450), on #191034.
- Content sits in a 1200px container, 124px from the edge at 1440px wide.
- A 96px header stays fixed at the top.
- The hero is 692px (0.8 screens): left-aligned 72px heading (weight 500), image behind the content, on #F4F6EB.
- Column splits on a 12-column grid: thirds (3×), halves, 3/3/2/2/2, 5/7; gaps of 24px.
- Headings align left (10 of 12 sections); centre only the occasional statement.
- Sections change background 2 times, between #F4F6EB, #191034: colour comes in full-width bands, not in boxes.
- A typical section is about 755px tall.

COPY SHAPE (MATCH THE LENGTH AND CASE; WRITE YOUR OWN WORDS)
- The main heading is 2 words long.
- Section headings are medium length: typically 4 words.
- Headings are in sentence case (only the first word capitalised).
- The page describes itself in about 14 words; keep your intro paragraph to about that length.

5. MOTION
Interactive elements change colour, background, border and opacity with the measured timing. Animate nothing else.
```css
a, button, [role="button"], input { transition: color var(--duration-1) var(--ease-1), background-color var(--duration-1) var(--ease-1), border-color var(--duration-1) var(--ease-1), opacity var(--duration-1) var(--ease-1); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
```
No scroll-triggered fade-ins, parallax, typewriter text or bouncing elements.

6. RESPONSIVE
- The design was measured at 1440px wide. Lay it out for that width first, then let it reflow down to 360px.
- Content sits in a column at most 1200px wide, centred, with var(--space-4) (16px) side padding on small screens.
- The largest heading scales fluidly: font-size: clamp(36px, 5vw, 72px). Every other size stays fixed.
- Break on composition, not device names: a row of columns drops a column when any column would be narrower than 240px; side-by-side splits stack when either side would be narrower than 320px.
- Spacing steps never change between sizes; use smaller steps from the same list where space is tight.
- On touch screens, every link and button has a hit area of at least 44 × 44px without changing its drawn size.

7. ACCESSIBILITY
- Text pairs that pass for body copy: Text on Background (5.4:1), Action on Background (5.2:1), Link on Background (14.3:1), Text on Surface (5.9:1), Action on Surface (5.7:1), Link on Surface (15.6:1) and On action on Action (5.7:1).
- Use no other text-on-background pairing.
- One h1 per page, headings in order, landmarks (header, nav, main, footer), real buttons and links, a label on every field, alt text on every image, an aria-label on icon-only buttons.
- Every interactive element shows the :focus-visible outline above.

8. DO NOT (THESE ARE WHAT MAKE AI-BUILT SITES LOOK GENERIC)
- No gradients: not in backgrounds, text, buttons or borders. (No gradient was measured.)
- Only these colours: #FFFFFF, #F4F6EB, #F4F3FB, #191034, #686082, #000000, #2E2E2E, #7C3AED, #A39AC1, #D5CFEF, #E6E0FE, #42385F, #D4C4FD, #281950, #6EE7B7. No new tints, no Tailwind defaults (slate, indigo, violet). (They are every colour that covers a measurable part of the page, and the colours its lines and drawings use.)
- #7C3AED only as small fills (buttons, badges) — never a section background or a large panel. (It covers 0.4% of the page.)
- #6EE7B7 only for text — never as a section background or a large panel. (It covers 0.1% of the page.)
- Only the fonts in the tokens: Figtree for body; Figtree for display. No other typeface, and no Inter, Roboto or system UI font unless it is one of these. (The page is set in Fricolage Grotesque and Mackinac; the tokens carry what stands in for them.)
- Headings and large text never heavier than weight 500. Do not make headlines bold to add emphasis. (Every size from 24px up is set at weight 500 or lighter.)
- Large headlines tracked tight (letter-spacing -0.02em), not at the browser default. (The 72px headline is set at -0.02em.)
- No icon above every feature, no emoji, no decorative blobs, sparkles or glows. (None of these is part of the captured design; they are a coding model's defaults.)
- The hero is left-aligned. Do not centre it. (The captured hero sets its heading on the left.)
- Build the sections your product needs, not the original's list. Give each one this system's look: its kinds of section (hero, text, split, cards, footer), its colours, type, shapes and spacing. (The style carries to any kind of site; the original's page was for a different product.)
- No glassmorphism, backdrop blur, glowing orbs, noise blobs or neon outlines.
- No row of three identical feature cards as the default section. Vary the layout from section to section: a split, a list, a single large statement, a table.
- No centred-everything hero with a pill badge, a gradient headline and two buttons. Lead with the most specific thing about the product.
- No filler copy: no "Unlock your potential", "Revolutionize", "Seamless", "Elevate", "Supercharge", "Next-gen" or lorem ipsum. Write plain, specific sentences a real company would publish.
- No made-up statistics, testimonials or customer logos. Leave a clearly marked [content: …] slot instead.
- No radius larger than the largest one listed.
- No shadows other than the levels listed.
- Do not use fly.io's name, logo, copy or images. This is its design system, not its content.

BEFORE YOU FINISH
- Search your code for every colour, font size, spacing value, radius, shadow and easing, and replace anything that is not a variable above.
- Check that no [content: …] slot has been filled with invented facts.
- Search your CSS for gradient(. There should be none.
- Every colour value in your CSS is one of the allowed colours. Nothing else, including in hover states.
- #7C3AED covers about 0.4% of the page or less, as on the original.
- #6EE7B7 covers about 0.1% of the page or less, as on the original.
- No text 24px or larger has a font-weight above 500.
- The largest headline uses letter-spacing -0.02em.
- Every section, including ones the original does not have, uses only this system's colours, type, shapes and spacing.
- Content sits in a 1200px container with 124px side margins at 1440px.
- There is no placeholder copy (lorem ipsum, "Feature one", "Your headline here"). Every word is real.
- Take a screenshot at 1440px and put it beside the original. List every difference in colour, weight, spacing, alignment and imagery, and fix each before finishing. Then check 390px wide: nothing scrolls sideways and no heading runs off the screen.