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Design System: Coinbase

Hermes Agent — Implementation Notes

The original site uses proprietary fonts. For self-contained HTML output, use these CDN substitutes: - Primary: DM Sans | Mono: system monospace stack - Font stack (CSS): font-family: 'DM Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; - Mono stack (CSS): font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace; html <link href="https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&display=swap" rel="stylesheet"> Use write_file to create HTML, serve via generative-widgets skill (cloudflared tunnel). Verify visual accuracy with browser_vision after generating.

1. Visual Theme & Atmosphere

Coinbase's website is a clean, trustworthy crypto platform that communicates financial reliability through a blue-and-white binary palette. The design uses Coinbase Blue (#0052ff) — a deep, saturated blue — as the singular brand accent against white and near-black surfaces. The proprietary font family includes CoinbaseDisplay for hero headlines, CoinbaseSans for UI text, CoinbaseText for body reading, and CoinbaseIcons for iconography — a comprehensive four-font system.

The button system uses a distinctive 56px radius for pill-shaped CTAs with hover transitions to a lighter blue (#578bfa). The design alternates between white content sections and dark (#0a0b0d, #282b31) feature sections, creating a professional, financial-grade interface.

Key Characteristics: - Coinbase Blue (#0052ff) as singular brand accent - Four-font proprietary family: Display, Sans, Text, Icons - 56px radius pill buttons with blue hover transition - Near-black (#0a0b0d) dark sections + white light sections - 1.00 line-height on display headings — ultra-tight - Cool gray secondary surface (#eef0f3) with blue tint - text-transform: lowercase on some button labels — unusual

2. Color Palette & Roles

Primary

• Coinbase Blue (#0052ff): Primary brand, links, CTA borders
• Pure White (#ffffff): Primary light surface
• Near Black (#0a0b0d): Text, dark section backgrounds
• Cool Gray Surface (#eef0f3): Secondary button background

Interactive

• Hover Blue (#578bfa): Button hover background
• Link Blue (#0667d0): Secondary link color
• Muted Blue (#5b616e): Border color at 20% opacity

Surface

• Dark Card (#282b31): Dark button/card backgrounds
• Light Surface (rgba(247,247,247,0.88)): Subtle surface

3. Typography Rules

Font Families

• Display: CoinbaseDisplay — hero headlines
• UI / Sans: CoinbaseSans — buttons, headings, nav
• Body: CoinbaseText — reading text
• Icons: CoinbaseIcons — icon font

Hierarchy

Role	Font	Size	Weight	Line Height	Notes
Display Hero	CoinbaseDisplay	80px	400	1.00 (tight)	Maximum impact
Display Secondary	CoinbaseDisplay	64px	400	1.00	Sub-hero
Display Third	CoinbaseDisplay	52px	400	1.00	Third tier
Section Heading	CoinbaseSans	36px	400	1.11 (tight)	Feature sections
Card Title	CoinbaseSans	32px	400	1.13	Card headings
Feature Title	CoinbaseSans	18px	600	1.33	Feature emphasis
Body Bold	CoinbaseSans	16px	700	1.50	Strong body
Body Semibold	CoinbaseSans	16px	600	1.25	Buttons, nav
Body	CoinbaseText	18px	400	1.56	Standard reading
Body Small	CoinbaseText	16px	400	1.50	Secondary reading
Button	CoinbaseSans	16px	600	1.20	+0.16px tracking
Caption	CoinbaseSans	14px	600–700	1.50	Metadata
Small	CoinbaseSans	13px	600	1.23	Tags

4. Component Stylings

Buttons

Primary Pill (56px radius) - Background: #eef0f3 or #282b31 - Radius: 56px - Border: 1px solid matching background - Hover: #578bfa (light blue) - Focus: 2px solid black outline

Full Pill (100000px radius) - Used for maximum pill shape

Blue Bordered - Border: 1px solid #0052ff - Background: transparent

Cards & Containers

• Radius: 8px–40px range
• Borders: 1px solid rgba(91,97,110,0.2)

5. Layout Principles

Spacing System

• Base: 8px
• Scale: 1px, 3px, 4px, 5px, 6px, 8px, 10px, 12px, 15px, 16px, 20px, 24px, 25px, 32px, 48px

Border Radius Scale

• Small (4px–8px): Article links, small cards
• Standard (12px–16px): Cards, menus
• Large (24px–32px): Feature containers
• XL (40px): Large buttons/containers
• Pill (56px): Primary CTAs
• Full (100000px): Maximum pill

6. Depth & Elevation

Minimal shadow system — depth from color contrast between dark/light sections.

7. Do's and Don'ts

Do

• Use Coinbase Blue (#0052ff) for primary interactive elements
• Apply 56px radius for all CTA buttons
• Use CoinbaseDisplay for hero headings only
• Alternate dark (#0a0b0d) and white sections

Don't

• Don't use the blue decoratively — it's functional only
• Don't use sharp corners on CTAs — 56px minimum

8. Responsive Behavior

Breakpoints: 400px, 576px, 640px, 768px, 896px, 1280px, 1440px, 1600px

9. Agent Prompt Guide

Quick Color Reference

• Brand: Coinbase Blue (#0052ff)
• Background: White (#ffffff)
• Dark surface: #0a0b0d
• Secondary surface: #eef0f3
• Hover: #578bfa
• Text: #0a0b0d

Example Component Prompts

• "Create hero: white background. CoinbaseDisplay 80px, line-height 1.00. Pill CTA (#eef0f3, 56px radius). Hover: #578bfa."
• "Build dark section: #0a0b0d background. CoinbaseDisplay 64px white text. Blue accent link (#0052ff)."