# DESIGN.md: Basecamp-style design system

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

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 basecamp.com, measured from the live site: it should feel designed by the same team as basecamp.com — the same temperament, colour, type and density — for a different product. Never use basecamp.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://basecamp.com/ — "basecamp.com" (home page).
- Page frame: a top navigation bar and a footer.
- Content is grouped in cards (122 on the page, up to 21 side by side). Keep cards for grouped content only, not for every section.
- It uses 302 images, 4 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: 17 buttons and 2 form fields on one page.
- The page runs about 10 screens long at 1440px wide.
- Density is moderate.

HOW IT LOOKS (WHAT MAKES IT LOOK LIKE ITSELF, BEYOND THE VALUES)
- Almost entirely neutral: 99% of the page is painted in #FFFFFF and #FFF9F5.
- #146DC7 is an accent: 0.5% of the page, used for text only. Don't fill large areas with it.
- #FFDC74 is an accent: 0.2% of the page, as small fills such as buttons and badges. Keep it to small areas.
- The largest type (42.13px Graphik) is bold (800), tracked to -0.026em.
- Balanced: text covers 14% of the page. Sections sit about 123px apart.
- Share of the painted page: #FFFFFF 64.8% (dominant, backgrounds); #FFF9F5 28.4% (dominant, backgrounds); #29353C 4% (supporting, text); #0B151B 1.8% (detail, backgrounds); #146DC7 0.5% (accent, text); #FFDC74 0.2% (accent, backgrounds); #117AF3 0.1% (accent, backgrounds and text). Keep accents at these proportions; do not promote them to fills.
- Hairline dividers: 1px lines in #29353C separate sections and rows (6 of them).
- Large images: Photographs, video or raster artwork cover about 32% of the page.
- Type as set (size, weight and tracking measured together; use these pairs): 42.13px weight 800 tracking -0.026em; 38.3px weight 800 tracking -0.026em; 30.64px weight 400 tracking -0.026em; 27.58px weight 400 tracking -0.014em; 22.98px weight 400 tracking -0.014em; 21.29px weight 700 tracking -0.024em.

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 — 64.8% · backgrounds (var(--color-background))
- #FFF9F5 — 28.4% · backgrounds (var(--color-fff9f5))
- #29353C — 4% · text (var(--color-text))
- #0B151B — 1.8% · backgrounds (var(--color-0b151b))
- #146DC7 — 0.5% · text
- #FFDC74 — 0.2% · backgrounds
- #117AF3 — 0.1% · backgrounds, text
- #FCF8F3 — Surface (var(--color-surface))
- #6D767B — Text muted (var(--color-text-muted))
- #E3E5E5 — Border (var(--color-border))
- #2377D2 — Action (var(--color-action))
- #000000 — On action (var(--color-on-action))
- #19874D — Positive (var(--color-positive))
- #A42D1E — Negative (var(--color-negative))
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=Inter+Tight:wght@400;500;600;700;800&display=swap");
```
Font: basecamp.com uses Graphik (body) — its own licensed face, not available to download. This kit uses Inter Tight for body, 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: #FFFFFF; /* Background */
  --color-surface: #FCF8F3; /* Surface */
  --color-text: #29353C; /* Text */
  --color-text-muted: #6D767B; /* Text muted */
  --color-border: #E3E5E5; /* Border */
  --color-action: #2377D2; /* Action */
  --color-on-action: #000000; /* On action */
  --color-positive: #19874D; /* Positive */
  --color-negative: #A42D1E; /* Negative */
  --color-fff9f5: #FFF9F5; /* 28.4% of the page, as fills */
  --color-0b151b: #0B151B; /* 1.8% of the page, as fills */
  --font-body: "Graphik", "Inter Tight", sans-serif; /* Graphik on the site; Inter Tight renders */
  --type-display-large: 42.13px; /* Display Large, weight 800 */
  --type-display-large-leading: 48.4477px;
  --type-display-large-tracking: -0.026em;
  --type-display-small: 38.3px; /* Display Small, weight 800 */
  --type-display-small-leading: 44.0434px;
  --type-display-small-tracking: -0.026em;
  --type-headline-large: 30.64px; /* Headline Large, weight 400 */
  --type-headline-large-leading: 39.8305px;
  --type-headline-large-tracking: -0.026em;
  --type-headline-small: 27.58px; /* Headline Small, weight 400 */
  --type-headline-small-leading: 27.575px;
  --type-headline-small-tracking: -0.014em;
  --type-title-large: 22.98px; /* Title Large, weight 400 */
  --type-title-large-leading: 29.8729px;
  --type-title-large-tracking: -0.014em;
  --type-title-medium: 21.29px; /* Title Medium, weight 700 */
  --type-title-medium-leading: 24.4831px;
  --type-title-medium-tracking: -0.024em;
  --type-title-small: 19.15px; /* Title Small, weight 400 */
  --type-title-small-leading: 28.7239px;
  --type-title-small-tracking: -0.014em;
  --type-body-large: 17.23px; /* Body Large, weight 500 */
  --type-body-large-leading: 17.2344px;
  --type-body-large-tracking: -0.014em;
  --type-body-medium: 16.76px; /* Body Medium, weight 600 */
  --type-body-medium-leading: 25.1335px;
  --type-body-medium-tracking: -0.014em;
  --type-body-small: 15.32px; /* Body Small, weight 500 */
  --type-body-small-leading: 19.9153px;
  --type-body-small-tracking: -0.014em;
  --type-label-1: 13.4px; /* Label 1, weight 600 */
  --type-label-1-leading: 20.1068px;
  --type-label-1-tracking: -0.014em;
  --type-label-2: 10.64px; /* Label 2, weight 500 */
  --type-label-2-leading: 14.1931px;
  --type-label-2-tracking: -0.006em;
  --type-label-3: 8.28px; /* Label 3, weight 400 */
  --type-label-3-leading: 12.419px;
  --type-label-3-tracking: -0.007em;
  --type-label-4: 7.1px; /* Label 4, weight 400 */
  --type-label-4-leading: 9.58036px;
  --type-label-4-tracking: -0.008em;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-36: 36px;
  --space-92: 92px;
  --radius-xs: 1.32353px;
  --radius-sm: 2.36552px;
  --radius-md: 2.64706px;
  --radius-lg: 4.73104px;
  --radius-xl: 5.29412px;
  --radius-2xl: 7.65972px;
  --radius-3xl: 7.94118px;
  --radius-full: 9999px;
  --elevation-1: rgb(227, 229, 229) 0px 0px 0px 0.59138px;
  --elevation-2: rgb(227, 229, 229) 0px 0px 0px 0.59138px inset;
  --elevation-3: rgb(227, 229, 229) 0px 0.59138px 0px 0px;
  --elevation-4: rgb(227, 229, 229) 0px 0px 0px 1.32353px;
  --elevation-5: rgb(227, 229, 229) 0px 0px 0px 1.32353px inset;
  --elevation-6: color(srgb 0.160784 0.207843 0.235294 / 0.05) 0px 0px 0px 1.32353px;
  --elevation-7: rgb(227, 229, 229) 0px 1.32353px 0px 0px;
  --elevation-8: rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --elevation-9: rgb(197, 200, 201) 0px 0px 0px 1.32353px inset;
  --elevation-10: rgba(41, 53, 60, 0.1) 0px 0px 0px 1.32353px inset;
  --elevation-11: color(srgb 0.160784 0.207843 0.235294 / 0.15) 0px 1.32353px 0px 0px;
  --elevation-12: color(srgb 0.160784 0.207843 0.235294 / 0.15) 0px 0px 0px 1.32353px inset;
  --elevation-13: rgb(227, 229, 229) 0px 0px 0px 0.59138px inset, rgba(41, 53, 60, 0.1) 0px 0px 1.18276px 0px;
  --elevation-14: rgb(255, 255, 255) 0px 0px 0px 1.98529px;
  --elevation-15: rgba(41, 53, 60, 0.1) -1.32353px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --elevation-16: rgb(255, 255, 255) 0px 0px 0px 2.64706px;
  --elevation-17: rgb(227, 229, 229) 0px 0px 0px 1.32353px inset, rgba(41, 53, 60, 0.1) 0px 0px 2.64706px 0px;
  --elevation-18: rgb(176, 154, 123) 2.64706px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --elevation-19: rgb(176, 154, 123) 2.64706px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) -1.32353px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --elevation-20: rgb(252, 248, 243) 0px 0px 0px 1.32353px, rgb(255, 255, 255) 0px 0px 0px 5.29412px;
  --elevation-21: oklch(0 0 0 / 0.12) 0px 0.502669px 1.67556px 0px, oklch(0 0 0 / 0.16) 0px 3.35113px 8.37782px -3.35113px;
  --elevation-22: oklch(0 0 0 / 0.1) 0px 2.6809px 21.4472px -6.70225px, oklch(0 0 0 / 0.1) 0px 4.02135px 26.809px -8.04271px, oklch(0 0 0 / 0.1) 0px 4.02135px 10.7236px -9.38316px, oklch(0 0 0 / 0.1) 0px 6.70225px 16.0854px -12.0641px, oklch(0 0 0 / 0.1) 0px 9.38316px 21.4472px -14.745px;
  --elevation-23: oklch(0 0 0 / 0.1) 0px 1.91493px 15.3194px -11.4896px, oklch(0 0 0 / 0.2) 0px 3.82986px 17.2344px -13.4045px, oklch(0 0 0 / 0.3) 0px 5.74479px 19.1493px -15.3194px, oklch(0 0 0 / 0.4) 0px 7.65972px 21.0642px -17.2344px, oklch(0 0 0 / 0.5) 0px 9.57465px 22.9792px -19.1493px;
  --elevation-24: oklch(0 0 0 / 0.05) 0px 1.91493px 30.6389px -9.57465px, oklch(0 0 0 / 0.05) 0px 3.82986px 38.2986px -11.4896px, oklch(0 0 0 / 0.05) 0px 3.82986px 15.3194px -13.4045px, oklch(0 0 0 / 0.05) 0px 7.65972px 22.9792px -17.2344px, oklch(0 0 0 / 0.05) 0px 11.4896px 30.6389px -21.0642px;
  --elevation-25: oklch(0 0 0 / 0.1) 0px 3.82986px 30.6389px -9.57465px, oklch(0 0 0 / 0.1) 0px 5.74479px 38.2986px -11.4896px, oklch(0 0 0 / 0.1) 0px 5.74479px 15.3194px -13.4045px, oklch(0 0 0 / 0.1) 0px 9.57465px 22.9792px -17.2344px, oklch(0 0 0 / 0.1) 0px 13.4045px 30.6389px -21.0642px;
  --elevation-26: oklch(0 0 0 / 0.0625) 0px 0px 0px 1px, oklch(0 0 0 / 0.04) 0px 3.82986px 30.6389px -9.57465px, oklch(0 0 0 / 0.04) 0px 5.74479px 38.2986px -11.4896px, oklch(0 0 0 / 0.04) 0px 5.74479px 15.3194px -13.4045px, oklch(0 0 0 / 0.04) 0px 9.57465px 22.9792px -17.2344px, oklch(0 0 0 / 0.04) 0px 13.4045px 30.6389px -21.0642px;
  --elevation-27: oklch(0 0 0 / 0.1125) 0px 0px 0px 1.53194px inset, oklch(0 0 0 / 0.04) 0px 6.12778px 49.0222px -15.3194px, oklch(0 0 0 / 0.04) 0px 9.19166px 61.2778px -18.3833px, oklch(0 0 0 / 0.04) 0px 9.19166px 24.5111px -21.4472px, oklch(0 0 0 / 0.04) 0px 15.3194px 36.7667px -27.575px, oklch(0 0 0 / 0.04) 0px 21.4472px 49.0222px -33.7028px;
  --elevation-28: oklch(0 0 0 / 0.02) 0px 0px 0px 1px, oklch(0 0 0 / 0.1) 0px 3.82986px 38.2986px -22.9792px, oklch(0 0 0 / 0.2) 0px 7.65972px 53.618px -26.809px, oklch(0 0 0 / 0.3) 0px 7.65972px 22.9792px -30.6389px, oklch(0 0 0 / 0.4) 0px 15.3194px 30.6389px -42.1285px, oklch(0 0 0 / 0.5) 0px 22.9792px 38.2986px -49.7882px;
  --elevation-29: oklch(0 0 0 / 0.02) 0px 0px 0px 1px, oklch(0 0 0 / 0.1) 0px 6.12778px 61.2778px -36.7667px, oklch(0 0 0 / 0.2) 0px 12.2556px 85.7889px -42.8944px, oklch(0 0 0 / 0.3) 0px 12.2556px 36.7667px -49.0222px, oklch(0 0 0 / 0.4) 0px 24.5111px 49.0222px -67.4055px, oklch(0 0 0 / 0.5) 0px 36.7667px 61.2778px -79.6611px;
  --duration-1: 0.15s;
  --duration-2: 0.3s;
  --ease-1: cubic-bezier(0.34, 1.2, 0.64, 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: #FFFFFF;
  --color-surface: #FCF8F3;
  --color-text: #29353C;
  --color-text-muted: #6D767B;
  --color-border: #E3E5E5;
  --color-action: #2377D2;
  --color-on-action: #000000;
  --color-positive: #19874D;
  --color-negative: #A42D1E;
  --color-fff9f5: #FFF9F5;
  --color-0b151b: #0B151B;
  --font-body: "Graphik", "Inter Tight", sans-serif;
  --text-display-large: 42.13px;
  --text-display-large--line-height: 48.4477px;
  --text-display-large--letter-spacing: -0.026em;
  --text-display-small: 38.3px;
  --text-display-small--line-height: 44.0434px;
  --text-display-small--letter-spacing: -0.026em;
  --text-headline-large: 30.64px;
  --text-headline-large--line-height: 39.8305px;
  --text-headline-large--letter-spacing: -0.026em;
  --text-headline-small: 27.58px;
  --text-headline-small--line-height: 27.575px;
  --text-headline-small--letter-spacing: -0.014em;
  --text-title-large: 22.98px;
  --text-title-large--line-height: 29.8729px;
  --text-title-large--letter-spacing: -0.014em;
  --text-title-medium: 21.29px;
  --text-title-medium--line-height: 24.4831px;
  --text-title-medium--letter-spacing: -0.024em;
  --text-title-small: 19.15px;
  --text-title-small--line-height: 28.7239px;
  --text-title-small--letter-spacing: -0.014em;
  --text-body-large: 17.23px;
  --text-body-large--line-height: 17.2344px;
  --text-body-large--letter-spacing: -0.014em;
  --text-body-medium: 16.76px;
  --text-body-medium--line-height: 25.1335px;
  --text-body-medium--letter-spacing: -0.014em;
  --text-body-small: 15.32px;
  --text-body-small--line-height: 19.9153px;
  --text-body-small--letter-spacing: -0.014em;
  --text-label-1: 13.4px;
  --text-label-1--line-height: 20.1068px;
  --text-label-1--letter-spacing: -0.014em;
  --text-label-2: 10.64px;
  --text-label-2--line-height: 14.1931px;
  --text-label-2--letter-spacing: -0.006em;
  --text-label-3: 8.28px;
  --text-label-3--line-height: 12.419px;
  --text-label-3--letter-spacing: -0.007em;
  --text-label-4: 7.1px;
  --text-label-4--line-height: 9.58036px;
  --text-label-4--letter-spacing: -0.008em;
  --radius-xs: 1.32353px;
  --radius-sm: 2.36552px;
  --radius-md: 2.64706px;
  --radius-lg: 4.73104px;
  --radius-xl: 5.29412px;
  --radius-2xl: 7.65972px;
  --radius-3xl: 7.94118px;
  --radius-full: 9999px;
  --shadow-e1: rgb(227, 229, 229) 0px 0px 0px 0.59138px;
  --shadow-e2: rgb(227, 229, 229) 0px 0px 0px 0.59138px inset;
  --shadow-e3: rgb(227, 229, 229) 0px 0.59138px 0px 0px;
  --shadow-e4: rgb(227, 229, 229) 0px 0px 0px 1.32353px;
  --shadow-e5: rgb(227, 229, 229) 0px 0px 0px 1.32353px inset;
  --shadow-e6: color(srgb 0.160784 0.207843 0.235294 / 0.05) 0px 0px 0px 1.32353px;
  --shadow-e7: rgb(227, 229, 229) 0px 1.32353px 0px 0px;
  --shadow-e8: rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --shadow-e9: rgb(197, 200, 201) 0px 0px 0px 1.32353px inset;
  --shadow-e10: rgba(41, 53, 60, 0.1) 0px 0px 0px 1.32353px inset;
  --shadow-e11: color(srgb 0.160784 0.207843 0.235294 / 0.15) 0px 1.32353px 0px 0px;
  --shadow-e12: color(srgb 0.160784 0.207843 0.235294 / 0.15) 0px 0px 0px 1.32353px inset;
  --shadow-e13: rgb(227, 229, 229) 0px 0px 0px 0.59138px inset, rgba(41, 53, 60, 0.1) 0px 0px 1.18276px 0px;
  --shadow-e14: rgb(255, 255, 255) 0px 0px 0px 1.98529px;
  --shadow-e15: rgba(41, 53, 60, 0.1) -1.32353px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --shadow-e16: rgb(255, 255, 255) 0px 0px 0px 2.64706px;
  --shadow-e17: rgb(227, 229, 229) 0px 0px 0px 1.32353px inset, rgba(41, 53, 60, 0.1) 0px 0px 2.64706px 0px;
  --shadow-e18: rgb(176, 154, 123) 2.64706px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --shadow-e19: rgb(176, 154, 123) 2.64706px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) -1.32353px 0px 0px 0px inset, rgba(41, 53, 60, 0.1) 0px 1.32353px 0px 0px inset;
  --shadow-e20: rgb(252, 248, 243) 0px 0px 0px 1.32353px, rgb(255, 255, 255) 0px 0px 0px 5.29412px;
  --shadow-e21: oklch(0 0 0 / 0.12) 0px 0.502669px 1.67556px 0px, oklch(0 0 0 / 0.16) 0px 3.35113px 8.37782px -3.35113px;
  --shadow-e22: oklch(0 0 0 / 0.1) 0px 2.6809px 21.4472px -6.70225px, oklch(0 0 0 / 0.1) 0px 4.02135px 26.809px -8.04271px, oklch(0 0 0 / 0.1) 0px 4.02135px 10.7236px -9.38316px, oklch(0 0 0 / 0.1) 0px 6.70225px 16.0854px -12.0641px, oklch(0 0 0 / 0.1) 0px 9.38316px 21.4472px -14.745px;
  --shadow-e23: oklch(0 0 0 / 0.1) 0px 1.91493px 15.3194px -11.4896px, oklch(0 0 0 / 0.2) 0px 3.82986px 17.2344px -13.4045px, oklch(0 0 0 / 0.3) 0px 5.74479px 19.1493px -15.3194px, oklch(0 0 0 / 0.4) 0px 7.65972px 21.0642px -17.2344px, oklch(0 0 0 / 0.5) 0px 9.57465px 22.9792px -19.1493px;
  --shadow-e24: oklch(0 0 0 / 0.05) 0px 1.91493px 30.6389px -9.57465px, oklch(0 0 0 / 0.05) 0px 3.82986px 38.2986px -11.4896px, oklch(0 0 0 / 0.05) 0px 3.82986px 15.3194px -13.4045px, oklch(0 0 0 / 0.05) 0px 7.65972px 22.9792px -17.2344px, oklch(0 0 0 / 0.05) 0px 11.4896px 30.6389px -21.0642px;
  --shadow-e25: oklch(0 0 0 / 0.1) 0px 3.82986px 30.6389px -9.57465px, oklch(0 0 0 / 0.1) 0px 5.74479px 38.2986px -11.4896px, oklch(0 0 0 / 0.1) 0px 5.74479px 15.3194px -13.4045px, oklch(0 0 0 / 0.1) 0px 9.57465px 22.9792px -17.2344px, oklch(0 0 0 / 0.1) 0px 13.4045px 30.6389px -21.0642px;
  --shadow-e26: oklch(0 0 0 / 0.0625) 0px 0px 0px 1px, oklch(0 0 0 / 0.04) 0px 3.82986px 30.6389px -9.57465px, oklch(0 0 0 / 0.04) 0px 5.74479px 38.2986px -11.4896px, oklch(0 0 0 / 0.04) 0px 5.74479px 15.3194px -13.4045px, oklch(0 0 0 / 0.04) 0px 9.57465px 22.9792px -17.2344px, oklch(0 0 0 / 0.04) 0px 13.4045px 30.6389px -21.0642px;
  --shadow-e27: oklch(0 0 0 / 0.1125) 0px 0px 0px 1.53194px inset, oklch(0 0 0 / 0.04) 0px 6.12778px 49.0222px -15.3194px, oklch(0 0 0 / 0.04) 0px 9.19166px 61.2778px -18.3833px, oklch(0 0 0 / 0.04) 0px 9.19166px 24.5111px -21.4472px, oklch(0 0 0 / 0.04) 0px 15.3194px 36.7667px -27.575px, oklch(0 0 0 / 0.04) 0px 21.4472px 49.0222px -33.7028px;
  --shadow-e28: oklch(0 0 0 / 0.02) 0px 0px 0px 1px, oklch(0 0 0 / 0.1) 0px 3.82986px 38.2986px -22.9792px, oklch(0 0 0 / 0.2) 0px 7.65972px 53.618px -26.809px, oklch(0 0 0 / 0.3) 0px 7.65972px 22.9792px -30.6389px, oklch(0 0 0 / 0.4) 0px 15.3194px 30.6389px -42.1285px, oklch(0 0 0 / 0.5) 0px 22.9792px 38.2986px -49.7882px;
  --shadow-e29: oklch(0 0 0 / 0.02) 0px 0px 0px 1px, oklch(0 0 0 / 0.1) 0px 6.12778px 61.2778px -36.7667px, oklch(0 0 0 / 0.2) 0px 12.2556px 85.7889px -42.8944px, oklch(0 0 0 / 0.3) 0px 12.2556px 36.7667px -49.0222px, oklch(0 0 0 / 0.4) 0px 24.5111px 49.0222px -67.4055px, oklch(0 0 0 / 0.5) 0px 36.7667px 61.2778px -79.6611px;
  --ease-1: cubic-bezier(0.34, 1.2, 0.64, 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)", "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)" },
  fontFamily: { "body": ["var(--font-body)"] },
  borderRadius: { "xs": "var(--radius-xs)", "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)", "e5": "var(--elevation-5)", "e6": "var(--elevation-6)", "e7": "var(--elevation-7)", "e8": "var(--elevation-8)", "e9": "var(--elevation-9)", "e10": "var(--elevation-10)", "e11": "var(--elevation-11)", "e12": "var(--elevation-12)", "e13": "var(--elevation-13)", "e14": "var(--elevation-14)", "e15": "var(--elevation-15)", "e16": "var(--elevation-16)", "e17": "var(--elevation-17)", "e18": "var(--elevation-18)", "e19": "var(--elevation-19)", "e20": "var(--elevation-20)", "e21": "var(--elevation-21)", "e22": "var(--elevation-22)", "e23": "var(--elevation-23)", "e24": "var(--elevation-24)", "e25": "var(--elevation-25)", "e26": "var(--elevation-26)", "e27": "var(--elevation-27)", "e28": "var(--elevation-28)", "e29": "var(--elevation-29)" },
}
```

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-body); 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);
  min-height: 149px;
  box-shadow: var(--elevation-1);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 8.27933px;
  font-weight: 400;
  line-height: 12.419px;
}
.card-2 { /* Alternative 1 */
  background: var(--color-background);
  box-shadow: var(--elevation-29);
  font-family: var(--font-body);
  font-size: 30.6389px;
  font-weight: 400;
  line-height: 45.9583px;
}
.card-3 { /* Alternative 2 */
  background: var(--color-background);
  border-radius: var(--radius-lg);
  min-height: 191px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 7.09656px;
  font-weight: 400;
  line-height: 8.87071px;
  /* recorded states: active */
}
.button-3 { /* Tertiary 3 */
  background: transparent;
  padding: 19px 21px 19px 21px;
  min-height: 52px;
  font-family: var(--font-body);
  font-size: 19.1493px;
  font-weight: 500;
  line-height: 19.1493px;
  /* recorded states: focus, hover */
}
.link-2 { /* Inline 2 */
  background: transparent;
  padding: 10px 12px 9px 12px;
  min-height: 36px;
  font-family: var(--font-body);
  font-size: 17.2344px;
  font-weight: 500;
  line-height: 17.2344px;
  /* recorded states: focus, hover */
}
.link-3 { /* Inline 3 */
  background: transparent;
  padding: 2px 0px 2px 0px;
  min-height: 34px;
  font-family: var(--font-body);
  font-size: 19.1493px;
  font-weight: 400;
  line-height: 28.7239px;
  /* recorded states: focus, hover */
}
.nav { /* Default */
  background: transparent;
  padding: 0px 31px 0px 31px;
  min-height: 92px;
  font-family: var(--font-body);
  font-size: 30.6389px;
  font-weight: 400;
  line-height: 45.9583px;
}
.input { /* Default */
  background: transparent;
  padding: 13px 19px 11px 19px;
  min-height: 50px;
  font-family: var(--font-body);
  font-size: 17.2344px;
  font-weight: 400;
  line-height: 25.8516px;
}
```
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 #FFFFFF. Keep that ground; do not add a dark mode or alternate section backgrounds the system does not have.
- #2377D2 is the action colour. Fill the primary action with it and little else — at most one #2377D2-filled element per screen; other accents keep to the uses listed above.
- Type: Inter Tight (standing in for Graphik) for body. Hierarchy comes from size and weight, not colour or decoration.
- Corner radii are 1.32353px, 2.36552px, 2.64706px, 4.73104px, 5.29412px, 7.65972px, 7.94118px, fully round (pill) — nothing else.
- Body text uses Graphik at around 15.88px, weights 400, 500, 600, 700, 800.
- Headings use the same family as body text; the largest heading is 47.65px.
- Primary buttons are #2377D2, 2.36552px radius, weight 400.
- Cards use square corners with a soft shadow.
- Corner radii in use: 10.5882px, 4.73104px, 5.29412px, 9999px (pill), 42.1285px.

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 — 767px tall, 3 equal columns, 11px gap, left-aligned 42.13px heading (weight 800) set low in the band.
2. Text — 1078px tall, left-aligned 19.15px heading (weight 400).
3. Full-bleed image — 924px tall, centred 42.13px heading (weight 800), full-width image.
4. Grid — 657px tall, 9 items in 3 columns with 38px gaps, centred 42.13px heading (weight 800).
5. Full-bleed image — 894px tall, centred 42.13px heading (weight 800), full-width image.
6. Full-bleed image — 812px tall, centred 42.13px heading (weight 800), full-width image.
7. Grid — 203px tall, 18 items in 4 columns with 10px gaps, left-aligned 19.15px heading (weight 400).
8. Statement — 78px tall, centred 42.13px heading (weight 800).
9. Text — 631px tall, left-aligned 22.98px heading (weight 800) set low in the band, image on the left.
10. Grid — 568px tall, 6 items in 2 columns with 72px gaps, centred 42.13px heading (weight 800).
11. Footer — 593px tall, centred 38.3px heading (weight 800).
- Content runs 1195px wide with 123px side margins at 1440px; there is no narrower centred container.
- A 92px header scrolls away, transparent over the first section.
- The hero is 767px (0.9 screens): 3 equal columns, 11px gap, left-aligned 42.13px heading (weight 800) set low in the band.
- Column splits on a 12-column grid: thirds (2×), 3/2/4/3, halves; gaps of 38px.
- Headings mix left (4) and centred (7) alignment.
- Sections share one background; they are separated by space and lines, not colour bands.
- A typical section is about 657px tall.

COPY SHAPE (MATCH THE LENGTH AND CASE; WRITE YOUR OWN WORDS)
- The main heading is 10 words long.
- Section headings are long: typically 9 words.
- Headings are in sentence case (only the first word capitalised).
- The page describes itself in about 29 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 1195px wide, centred, with var(--space-16) (16px) side padding on small screens.
- The largest heading scales fluidly: font-size: clamp(22.98px, 2.9vw, 42.13px). 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 (12.6:1), Text muted on Background (4.6:1), Action on Background (4.5:1), Positive on Background (4.6:1), Negative on Background (7.1:1), Text on Surface (11.9:1), Negative on Surface (6.7:1) and On action on Action (4.6:1).
- Only for text 24px and up, or 18.66px bold: Text muted on Surface (4.4:1), Action on Surface (4.3:1) and Positive on Surface (4.3:1).
- 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, #FFF9F5, #29353C, #0B151B, #146DC7, #FFDC74, #117AF3, #FCF8F3, #6D767B, #E3E5E5, #2377D2, #000000, #19874D, #A42D1E. 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.)
- #146DC7 only for text — never as a section background or a large panel. (It covers 0.5% of the page.)
- #FFDC74 only as small fills (buttons, badges) — never a section background or a large panel. (It covers 0.2% of the page.)
- Only the fonts in the tokens: Inter Tight for body. No other typeface, and no Inter, Roboto or system UI font unless it is one of these. (The page is set in Graphik; the tokens carry what stands in for them.)
- The largest headlines are heavy (weight 800). Keep them that heavy, and keep smaller text at the weights in the type scale. (The page sets its biggest type at 800.)
- Large headlines tracked tight (letter-spacing -0.026em), not at the browser default. (The 42.13px headline is set at -0.026em.)
- 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, low in the first screen.)
- Build the sections your product needs, not the original's list. Give each one this system's look: its kinds of section (hero, text, image, grid, statement, 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 basecamp.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.
- #146DC7 covers about 0.5% of the page or less, as on the original.
- #FFDC74 covers about 0.2% of the page or less, as on the original.
- The largest headline is set at weight 800.
- The largest headline uses letter-spacing -0.026em.
- Every section, including ones the original does not have, uses only this system's colours, type, shapes and spacing.
- 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.