# DESIGN.md: Resend-style design system

Measured from https://resend.com/ on 2026-10-14 by PikSpec (https://www.pikspec.com). An independent measurement of the rendered page, not Resend's official design system, and not affiliated with Resend.

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 resend.com, measured from the live site: it should feel designed by the same team as resend.com — the same temperament, colour, type and density — for a different product. Never use resend.com'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://resend.com/ — "resend.com" (home page).
- Page frame: a top navigation bar and a footer.
- Content is grouped in cards (8 on the page). Keep cards for grouped content only, not for every section.
- It uses 46 images including 5 videos, 17 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: 46 buttons and 3 form fields on one page.
- The page runs about 14 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 #000000 and #FFFFFF.
- #FF0000 is an accent: 0.4% of the page, used for drawings only. Don't fill large areas with it.
- #0064FF is an accent: 0.4% of the page, used for drawings only. Don't fill large areas with it.
- The largest type (96px domaine) is regular weight, not bold (400), tracked to -0.01em.
- Open: text covers 9% of the page.
- Structure comes from thin grid lines, not from shadows or filled cards.
- Share of the painted page: #000000 89.5% (dominant, backgrounds); #F0F0F0 2.7% (supporting, text); #A1A4A5 2.4% (supporting, text); #FFFFFF 2.1% (detail, backgrounds and drawings); #FCFDFF 0.5% (detail, text); #F1F7FE 0.4% (detail, text); #FF0000 0.4% (accent, drawings); #0064FF 0.4% (accent, drawings). Keep accents at these proportions; do not promote them to fills.
- Hairline grid: 1px lines in #D6EBFD run both across and down the page (36 across, 29 down), dividing it into cells instead of cards.
- Illustrations: 2 large illustrations in filled shapes.
- Small marks: 14 small decorative marks (dots, crosses or ticks under 16px) in #FFFFFF and #F1F7FE, placed at corners and edges.
- Large images: Photographs, video or raster artwork cover about 22% of the page.
- Type as set (size, weight and tracking measured together; use these pairs): 96px weight 400 tracking -0.01em; 76.8px weight 400 tracking -0.01em; 56px weight 400 tracking -0.05em; 24px weight 500; 20px weight 400; 18px weight 400.

1. DESIGN TOKENS — PASTE INTO YOUR GLOBAL CSS
Allowed colours, with how the original uses each. Use no other colour, including in hover states:
- #000000 — 89.5% · backgrounds (var(--color-background))
- #F0F0F0 — 2.7% · text (var(--color-text))
- #A1A4A5 — 2.4% · text (var(--color-text-muted))
- #FFFFFF — 2.1% · backgrounds, drawings (var(--color-ffffff))
- #FCFDFF — 0.5% · text
- #F1F7FE — 0.4% · text
- #FF0000 — 0.4% · drawings (var(--color-ff0000))
- #0064FF — 0.4% · drawings (var(--color-0064ff))
- #00FF00 — 0.4% · drawings (var(--color-00ff00))
- #EBECED — 0.3% · text
- #262A2D — hairlines and grid lines (var(--color-border))
- #0B0E14 — Surface (var(--color-surface))
- #D6EBFD — Action (var(--color-action))
- #00C951 — Positive (var(--color-positive))
- #FF9592 — Negative (var(--color-negative))
- #FFC446 — Warning (var(--color-warning))
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=JetBrains+Mono:wght@400&display=swap");
@import url("https://fonts.googleapis.com/css2?family=inter:wght@400;500;600&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Newsreader:wght@400&display=swap");
```
Font: resend.com uses commitMono (body) and domaine (display) — its own licensed faces, not available to download. This kit uses JetBrains Mono for body and Newsreader for display, the closest free matches, 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.
inter is on Google Fonts and loaded from there.
Keep every size, weight, line height and tracking exactly as listed whichever font renders.
```css
:root {
  --color-background: #000000; /* Background */
  --color-surface: #0B0E14; /* Surface */
  --color-text: #F0F0F0; /* Text */
  --color-text-muted: #A1A4A5; /* Text muted */
  --color-border: #262A2D; /* Border */
  --color-action: #D6EBFD; /* Action */
  --color-on-action: #000000; /* On action */
  --color-positive: #00C951; /* Positive */
  --color-negative: #FF9592; /* Negative */
  --color-warning: #FFC446; /* Warning */
  --color-ffffff: #FFFFFF; /* 2.1% of the page, as fills */
  --color-ff0000: #FF0000; /* 0.4% of the page, as drawings */
  --color-0064ff: #0064FF; /* 0.4% of the page, as drawings */
  --color-00ff00: #00FF00; /* 0.4% of the page, as drawings */
  --font-body: "commitMono", "JetBrains Mono", monospace; /* commitMono on the site; JetBrains Mono renders */
  --font-interface: inter, sans-serif; /* inter */
  --font-display: domaine, "Newsreader", sans-serif; /* domaine on the site; Newsreader renders */
  --type-display-large: 96px; /* Display Large, weight 400 */
  --type-display-large-leading: 96px;
  --type-display-large-tracking: -0.01em;
  --type-display-medium: 76.8px; /* Display Medium, weight 400 */
  --type-display-medium-leading: 76.8px;
  --type-display-medium-tracking: -0.01em;
  --type-display-small: 56px; /* Display Small, weight 400 */
  --type-display-small-leading: 67.2px;
  --type-display-small-tracking: -0.05em;
  --type-headline: 24px; /* Headline, weight 500 */
  --type-headline-leading: 36px;
  --type-title-large: 20px; /* Title Large, weight 400 */
  --type-title-large-leading: 20px;
  --type-title-small: 18px; /* Title Small, weight 400 */
  --type-title-small-leading: 27px;
  --type-body-large: 16px; /* Body Large, weight 600 */
  --type-body-large-leading: 24px;
  --type-body-small: 14px; /* Body Small, weight 400 */
  --type-body-small-leading: 22.4px;
  --type-label: 12px; /* Label, weight 400 */
  --type-label-leading: 16px;
  --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-26: 104px;
  --space-36: 144px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 10px;
  --radius-2xl: 12px;
  --radius-3xl: 16px;
  --radius-full: 9999px;
  --elevation-1: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(24, 25, 28, 0.88) 0px 0px 0px 1px, 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(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgb(255, 255, 255) 0px 1px 1px 0px inset;
  --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) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.1) 0px 1px 3px 0px, rgba(0, 0, 0, 0.1) 0px 1px 2px -1px;
  --elevation-4: rgb(0, 0, 0) 0px 0px 0px 8px;
  --duration-1: 0.15s;
  --duration-2: 0.2s;
  --duration-3: 0.3s;
  --duration-4: 0.5s;
  --duration-5: 0.6s;
  --duration-6: 1s;
  --ease-1: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-2: ease-in-out;
  --ease-3: cubic-bezier(0.36, 0.66, 0.6, 1);
  --ease-4: cubic-bezier(0, 0, 0.2, 1);
  --ease-5: linear;
}
```
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: #000000;
  --color-surface: #0B0E14;
  --color-text: #F0F0F0;
  --color-text-muted: #A1A4A5;
  --color-border: #262A2D;
  --color-action: #D6EBFD;
  --color-on-action: #000000;
  --color-positive: #00C951;
  --color-negative: #FF9592;
  --color-warning: #FFC446;
  --color-ffffff: #FFFFFF;
  --color-ff0000: #FF0000;
  --color-0064ff: #0064FF;
  --color-00ff00: #00FF00;
  --font-body: "commitMono", "JetBrains Mono", monospace;
  --font-interface: inter, sans-serif;
  --font-display: domaine, "Newsreader", sans-serif;
  --text-display-large: 96px;
  --text-display-large--line-height: 96px;
  --text-display-large--letter-spacing: -0.01em;
  --text-display-medium: 76.8px;
  --text-display-medium--line-height: 76.8px;
  --text-display-medium--letter-spacing: -0.01em;
  --text-display-small: 56px;
  --text-display-small--line-height: 67.2px;
  --text-display-small--letter-spacing: -0.05em;
  --text-headline: 24px;
  --text-headline--line-height: 36px;
  --text-title-large: 20px;
  --text-title-large--line-height: 20px;
  --text-title-small: 18px;
  --text-title-small--line-height: 27px;
  --text-body-large: 16px;
  --text-body-large--line-height: 24px;
  --text-body-small: 14px;
  --text-body-small--line-height: 22.4px;
  --text-label: 12px;
  --text-label--line-height: 16px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 10px;
  --radius-2xl: 12px;
  --radius-3xl: 16px;
  --radius-full: 9999px;
  --shadow-e1: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(24, 25, 28, 0.88) 0px 0px 0px 1px, 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(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgb(255, 255, 255) 0px 1px 1px 0px inset;
  --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) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.1) 0px 1px 3px 0px, rgba(0, 0, 0, 0.1) 0px 1px 2px -1px;
  --shadow-e4: rgb(0, 0, 0) 0px 0px 0px 8px;
  --ease-1: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-2: ease-in-out;
  --ease-3: cubic-bezier(0.36, 0.66, 0.6, 1);
  --ease-4: cubic-bezier(0, 0, 0.2, 1);
  --ease-5: linear;
}
```
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)", "text-muted": "var(--color-text-muted)", "border": "var(--color-border)", "action": "var(--color-action)", "on-action": "var(--color-on-action)", "positive": "var(--color-positive)", "negative": "var(--color-negative)", "warning": "var(--color-warning)" },
  fontFamily: { "body": ["var(--font-body)"], "interface": ["var(--font-interface)"], "display": ["var(--font-display)"] },
  borderRadius: { "sm": "var(--radius-sm)", "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); font-size: var(--type-body-large); line-height: var(--type-body-large-leading); 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: inherit; }
:focus-visible { outline: 2px solid var(--color-action); outline-offset: 2px; }
```

3. COMPONENTS — MATCH THESE EXACTLY
```css
.card { /* Default */
  background: var(--color-background);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24px;
}
.card-2 { /* Alternative 1 */
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 16px 16px 0px 0px;
  min-height: 152px;
  color: var(--color-text);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24px;
}
.button { /* Primary */
  background: var(--color-action);
  border-radius: var(--radius-sm);
  padding: 12px 20px 12px 20px;
  min-height: 41px;
  color: var(--color-on-action);
  font-family: "Helvetica";
  font-size: var(--type-body-small);
  font-weight: 600;
  line-height: 14px;
}
.button-2 { /* Tertiary */
  background: transparent;
  min-height: 94px;
  color: var(--color-text-muted);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24px;
  /* recorded states: selected, hover */
}
.button-3 { /* Tertiary 2 */
  background: transparent;
  padding: 4px 12px 4px 12px;
  min-height: 58px;
  color: var(--color-text-muted);
  font-family: var(--font-interface);
  font-size: var(--type-body-small);
  font-weight: 500;
  line-height: 20px;
  /* recorded states: collapsed, hover, focus-visible */
}
.link { /* Inline */
  background: transparent;
  border-radius: var(--radius-md);
  padding: 2px 4px 2px 4px;
  color: #F1F7FE;
  font-family: var(--font-interface);
  font-size: var(--type-body-small);
  font-weight: 400;
  line-height: 20px;
  /* recorded states: hover, focus-visible */
}
.link-2 { /* Strong */
  background: transparent;
  border-radius: var(--radius-3xl);
  padding: 0px 16px 0px 16px;
  min-height: 40px;
  color: var(--color-text-muted);
  font-family: var(--font-interface);
  font-size: var(--type-body-small);
  font-weight: 600;
  line-height: 20px;
  /* recorded states: hover, focus-visible, disabled */
}
.link-3 { /* Strong 2 */
  background: transparent;
  border-radius: var(--radius-3xl);
  padding: 0px 20px 0px 20px;
  min-height: 48px;
  color: var(--color-text-muted);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 600;
  line-height: 24px;
  /* recorded states: hover, focus-visible, disabled */
}
.input { /* Default */
  background: var(--color-ffffff);
  min-height: 41px;
  color: #000000;
  font-family: "-apple-system";
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24.8px;
}
.input-2 { /* Alternative 1 */
  background: transparent;
  border-radius: var(--radius-sm);
  min-height: 28px;
  color: var(--color-text);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24px;
  /* recorded states: collapsed, focus-visible */
}
.input-3 { /* Alternative 2 */
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-interface);
  font-size: var(--type-body-large);
  font-weight: 400;
  line-height: 24px;
}
```
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
- Dark interface on #000000. Keep that ground; do not add a light mode or alternate section backgrounds the system does not have.
- 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.
- #D6EBFD is the action colour. Fill the primary action with it and little else — at most one #D6EBFD-filled element per screen; other accents keep to the uses listed above.
- Type: JetBrains Mono (standing in for commitMono) for body; inter for interface; Newsreader (standing in for domaine) for display. Hierarchy comes from size and weight, not colour or decoration.
- Everything sits on a 4px grid.
- Corner radii are 4px, 6px, 8px, 10px, 12px, 16px, fully round (pill) — nothing else.
- Body text uses commitMono at around 16px, weights 400.
- Headings use aBCFavorit; the largest heading is 96px.
- Primary buttons are #D6EBFD, 16px radius, weight 400.
- Cards use 6px corners.
- Corner radii in use: 9999px (pill), 16px, 6px, 8px, 4px.

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 — 900px tall, left-aligned 96px heading (weight 400) set mid-band, artwork behind the content.
2. Cards — 567px tall, 6 equal columns, 16px gap, centred 18px heading (weight 400).
3. Statement — 1296px tall, a strip of 13 small items (logos, links or icons), centred 56px heading (weight 400).
4. Split — 967px tall, 2 equal columns, 32px gap, left-aligned 56px heading (weight 400).
5. Statement — 1358px tall, centred 56px heading (weight 400), artwork centred.
6. Split — 899px tall, 2 equal columns, 32px gap, left-aligned 56px heading (weight 400), artwork on the right.
7. Split — 1367px tall, split 2 / 10, centred 56px heading (weight 400).
8. Grid — 941px tall, 9 items in 3 columns with 80px gaps, left-aligned 56px heading (weight 400).
9. Statement — 631px tall, centred 24px heading (weight 500) set mid-band.
10. Cards — 1352px tall, 3 equal columns, 32px gap, centred 56px heading (weight 400), full-width artwork.
11. Cards — 685px tall, 3 equal columns, 32px gap, centred 56px heading (weight 400).
12. Statement — 702px tall, centred 76.8px heading (weight 400), full-width artwork.
13. Footer — 597px tall, split 3 / 9, 32px gap, left-aligned 14px heading (weight 400), on #000000.
- Content sits in a 1280px container, 104px from the edge at 1440px wide.
- A 58px header stays fixed at the top, transparent over the first section.
- The hero is 900px (exactly one screen): left-aligned 96px heading (weight 400) set mid-band, artwork behind the content.
- Column splits on a 12-column grid: thirds (3×), halves (2×), sixths, 2/10; gaps of 32px.
- Headings mix left (5) and centred (8) alignment.
- Sections share one background; they are separated by space and lines, not colour bands.
- A typical section is about 941px tall.

COPY SHAPE (MATCH THE LENGTH AND CASE; WRITE YOUR OWN WORDS)
- The main heading is 2 words long.
- Section headings are short: typically 3 words.
- Headings are in sentence case (only the first word capitalised).
- The page describes itself in about 17 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 1109px wide, centred, with var(--space-4) (16px) side padding on small screens.
- The largest heading scales fluidly: font-size: clamp(56px, 6.7vw, 96px). 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 (18.4:1), Text muted on Background (8.4:1), Action on Background (17.2:1), Positive on Background (9.5:1), Negative on Background (10:1), Text on Surface (17:1), Text muted on Surface (7.7:1), Action on Surface (15.8:1), Positive on Surface (8.7:1), Negative on Surface (9.2:1) and On action on Action (17.2:1).
- 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: #000000, #F0F0F0, #A1A4A5, #FFFFFF, #FCFDFF, #F1F7FE, #FF0000, #0064FF, #00FF00, #EBECED, #262A2D, #0B0E14, #D6EBFD, #00C951, #FF9592, #FFC446. 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.)
- #FF0000 only for drawings — never as a section background or a large panel. (It covers 0.4% of the page.)
- #0064FF only for drawings — never as a section background or a large panel. (It covers 0.4% of the page.)
- Only the fonts in the tokens: JetBrains Mono for body; inter for interface; Newsreader for display. No other typeface, and no Inter, Roboto or system UI font unless it is one of these. (The page is set in aBCFavorit and inter and commitMono; 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 -0.01em), not at the browser default. (The 96px headline is set at -0.01em.)
- No all-caps eyebrow labels above headings. (No uppercase text was measured.)
- 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, cards, statement, split, grid, 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 resend.com'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.
- #FF0000 covers about 0.4% of the page or less, as on the original.
- #0064FF covers about 0.4% 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 -0.01em.
- Every section, including ones the original does not have, uses only this system's colours, type, shapes and spacing.
- Content sits in a 1280px container with 104px 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.