--- version: alpha name: Coinbase description: An institutional-grade crypto exchange whose marketing surfaces read like a quietly-confident financial-services brand. The base canvas is pure white; Coinbase Blue (`#0052ff`) is the single brand voltage, used scarcely on primary CTAs, signature glyphs, and inline accent moments. Type runs Coinbase's licensed CoinbaseDisplay (display) and CoinbaseSans (body) at modest weights — display sits at weight 400 not 700, signaling editorial calm rather than fintech-bombastic. Page rhythm rotates between bright white sections, soft gray elevation bands, and full-bleed dark editorial heroes (`#0a0b0d`) carrying product-ui mockup cards. Iconography is geometric and minimal; depth comes from card-on-card layering, never decorative shadows. colors: primary: "#0052ff" primary-active: "#003ecc" primary-disabled: "#a8b8cc" ink: "#0a0b0d" body: "#5b616e" body-strong: "#0a0b0d" muted: "#7c828a" muted-soft: "#a8acb3" hairline: "#dee1e6" hairline-soft: "#eef0f3" canvas: "#ffffff" surface-soft: "#f7f7f7" surface-card: "#ffffff" surface-strong: "#eef0f3" surface-dark: "#0a0b0d" surface-dark-elevated: "#16181c" on-primary: "#ffffff" on-dark: "#ffffff" on-dark-soft: "#a8acb3" semantic-up: "#05b169" semantic-down: "#cf202f" accent-yellow: "#f4b000" typography: display-mega: fontFamily: "'Coinbase Display', -apple-system, system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif" fontSize: 80px fontWeight: 400 lineHeight: 1.0 letterSpacing: -2px display-xl: fontFamily: "'Coinbase Display', sans-serif" fontSize: 64px fontWeight: 400 lineHeight: 1.0 letterSpacing: -1.6px display-lg: fontFamily: "'Coinbase Display', sans-serif" fontSize: 52px fontWeight: 400 lineHeight: 1.0 letterSpacing: -1.3px display-md: fontFamily: "'Coinbase Display', sans-serif" fontSize: 44px fontWeight: 400 lineHeight: 1.09 letterSpacing: -1px display-sm: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 36px fontWeight: 400 lineHeight: 1.11 letterSpacing: -0.5px title-lg: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 32px fontWeight: 400 lineHeight: 1.13 letterSpacing: -0.4px title-md: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 18px fontWeight: 600 lineHeight: 1.33 letterSpacing: 0 title-sm: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 16px fontWeight: 600 lineHeight: 1.25 letterSpacing: 0 body-md: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 16px fontWeight: 400 lineHeight: 1.5 letterSpacing: 0 body-strong: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 16px fontWeight: 700 lineHeight: 1.5 letterSpacing: 0 body-sm: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 14px fontWeight: 400 lineHeight: 1.5 letterSpacing: 0 caption: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 13px fontWeight: 400 lineHeight: 1.5 letterSpacing: 0 caption-strong: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 12px fontWeight: 600 lineHeight: 1.5 letterSpacing: 0 number-display: fontFamily: "'Coinbase Mono', 'Coinbase Sans', monospace" fontSize: 18px fontWeight: 500 lineHeight: 1.4 letterSpacing: 0 button: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 16px fontWeight: 600 lineHeight: 1.15 letterSpacing: 0 nav-link: fontFamily: "'Coinbase Sans', sans-serif" fontSize: 14px fontWeight: 500 lineHeight: 1.4 letterSpacing: 0 rounded: none: 0px xs: 4px sm: 8px md: 12px lg: 16px xl: 24px pill: 100px full: 9999px spacing: xxs: 4px xs: 8px sm: 12px base: 16px md: 20px lg: 24px xl: 32px xxl: 48px section: 96px components: top-nav-light: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" typography: "{typography.nav-link}" height: 64px top-nav-on-dark: backgroundColor: "{colors.surface-dark}" textColor: "{colors.on-dark}" typography: "{typography.nav-link}" height: 64px button-primary: backgroundColor: "{colors.primary}" textColor: "{colors.on-primary}" typography: "{typography.button}" rounded: "{rounded.pill}" padding: 12px 20px height: 44px button-primary-active: backgroundColor: "{colors.primary-active}" textColor: "{colors.on-primary}" rounded: "{rounded.pill}" button-primary-disabled: backgroundColor: "{colors.primary-disabled}" textColor: "{colors.on-primary}" rounded: "{rounded.pill}" button-secondary-light: backgroundColor: "{colors.surface-strong}" textColor: "{colors.ink}" typography: "{typography.button}" rounded: "{rounded.pill}" padding: 12px 20px height: 44px button-secondary-dark: backgroundColor: "{colors.surface-dark-elevated}" textColor: "{colors.on-dark}" typography: "{typography.button}" rounded: "{rounded.pill}" padding: 12px 20px height: 44px button-outline-on-dark: backgroundColor: transparent textColor: "{colors.on-dark}" typography: "{typography.button}" rounded: "{rounded.pill}" padding: 11px 19px height: 44px button-tertiary-text: backgroundColor: transparent textColor: "{colors.primary}" typography: "{typography.button}" button-pill-cta: backgroundColor: "{colors.primary}" textColor: "{colors.on-primary}" typography: "{typography.button}" rounded: "{rounded.pill}" padding: 16px 32px height: 56px hero-band-dark: backgroundColor: "{colors.surface-dark}" textColor: "{colors.on-dark}" typography: "{typography.display-mega}" padding: 96px hero-band-light: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" typography: "{typography.display-mega}" padding: 96px product-ui-card-dark: backgroundColor: "{colors.surface-dark-elevated}" textColor: "{colors.on-dark}" rounded: "{rounded.xl}" padding: 32px product-ui-card-light: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" rounded: "{rounded.xl}" padding: 32px feature-card: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" typography: "{typography.title-md}" rounded: "{rounded.xl}" padding: 32px asset-row: backgroundColor: transparent textColor: "{colors.ink}" typography: "{typography.body-md}" padding: 16px 0 price-up-cell: backgroundColor: transparent textColor: "{colors.semantic-up}" typography: "{typography.number-display}" price-down-cell: backgroundColor: transparent textColor: "{colors.semantic-down}" typography: "{typography.number-display}" pricing-tier-card: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" typography: "{typography.body-md}" rounded: "{rounded.xl}" padding: 32px pricing-tier-featured: backgroundColor: "{colors.surface-dark}" textColor: "{colors.on-dark}" typography: "{typography.body-md}" rounded: "{rounded.xl}" padding: 32px cta-band-dark: backgroundColor: "{colors.surface-dark}" textColor: "{colors.on-dark}" typography: "{typography.display-lg}" padding: 96px text-input: backgroundColor: "{colors.canvas}" textColor: "{colors.ink}" typography: "{typography.body-md}" rounded: "{rounded.md}" padding: 14px 16px height: 48px search-input-pill: backgroundColor: "{colors.surface-strong}" textColor: "{colors.ink}" typography: "{typography.body-md}" rounded: "{rounded.pill}" padding: 12px 20px height: 44px badge-pill: backgroundColor: "{colors.surface-strong}" textColor: "{colors.ink}" typography: "{typography.caption-strong}" rounded: "{rounded.pill}" padding: 4px 12px asset-icon-circular: backgroundColor: "{colors.surface-strong}" rounded: "{rounded.full}" size: 32px footer-light: backgroundColor: "{colors.canvas}" textColor: "{colors.body}" typography: "{typography.body-sm}" padding: 64px 48px footer-link: backgroundColor: transparent textColor: "{colors.body}" typography: "{typography.body-sm}" legal-band: backgroundColor: "{colors.canvas}" textColor: "{colors.muted}" typography: "{typography.caption}" --- ## Overview Coinbase reads like an institutional financial brand that happens to trade crypto — the marketing surfaces are quiet, white-canvas, editorially-spaced, and almost monochromatic. The single brand voltage is **Coinbase Blue** (`{colors.primary}` — #0052ff), used scarcely: every primary CTA pill, the brand wordmark, and inline emphasis links. Beyond that one blue, the system is white canvas + ink + soft gray elevation bands + a deep near-black editorial canvas (`{colors.surface-dark}` — #0a0b0d) for full-bleed product-mockup heroes. Type pairs **CoinbaseDisplay** for hero headlines with **CoinbaseSans** for body, captions, and navigation. Display sits at **weight 400** — not the 700+ typical of trading platforms. The choice signals editorial calm and institutional trust rather than fintech urgency. The page rhythm rotates three modes: bright white editorial sections, soft-gray elevation bands, and **full-bleed dark editorial heroes** carrying layered product-UI mockup cards. The dark hero with floating dashboard mockups is the single most distinctive component. **Key Characteristics:** - Single accent color: `{colors.primary}` (#0052ff Coinbase Blue) carries every primary CTA, wordmark, and inline brand link. Used scarcely. - Modest display weights — CoinbaseDisplay at weight 400, never 700+. - Editorial pill geometry: every CTA is `{rounded.pill}` (100px), every asset glyph is `{rounded.full}`, every card is `{rounded.xl}` (24px). Sharp corners absent. - Full-bleed dark heroes with floating product-UI cards: `{component.hero-band-dark}` plus inline `{component.product-ui-card-dark}` mockups is the brand's strongest signature pattern. - Trading semantics: `{colors.semantic-up}` (#05b169) and `{colors.semantic-down}` (#cf202f) — text color only, never background fills. - 96px section rhythm — generous editorial pacing. ## Colors ### Brand & Accent - **Coinbase Blue** (`{colors.primary}` — #0052ff): The single brand color. Every primary CTA pill, the Coinbase wordmark, and inline brand links. - **Coinbase Blue Active** (`{colors.primary-active}` — #003ecc): Press-state darken on the primary pill. - **Coinbase Blue Disabled** (`{colors.primary-disabled}` — #a8b8cc): Faded-blue tint for disabled CTAs. - **Accent Yellow** (`{colors.accent-yellow}` — #f4b000): A small sub-brand accent used very sparingly on Bitcoin/asset glyph fills inside feature cards. Illustrative-only, not an action color. ### Surface - **Canvas** (`{colors.canvas}` — #ffffff): The default page floor. - **Surface Soft** (`{colors.surface-soft}` — #f7f7f7): Subtle alternating band surface. - **Surface Strong** (`{colors.surface-strong}` — #eef0f3): The light-gray fill behind secondary buttons, search pills, asset-icon plates. - **Surface Dark** (`{colors.surface-dark}` — #0a0b0d): Deep near-black canvas for full-bleed dark heroes, CTA bands. Same hex as `{colors.ink}` — page-floor and text-color share the value. - **Surface Dark Elevated** (`{colors.surface-dark-elevated}` — #16181c): One step lighter, used for floating product-UI mockup cards inside dark heroes. ### Hairlines - **Hairline** (`{colors.hairline}` — #dee1e6): Default 1px divider on white surfaces. - **Hairline Soft** (`{colors.hairline-soft}` — #eef0f3): Lighter divider — same hex as `{colors.surface-strong}`. ### Text - **Ink** (`{colors.ink}` — #0a0b0d): Display headings, primary nav, body emphasis. - **Body** (`{colors.body}` — #5b616e): Default running-text — slightly cool gray. - **Body Strong** (`{colors.body-strong}` — #0a0b0d): Same as ink, used for stronger emphasis. - **Muted** (`{colors.muted}` — #7c828a): Sub-titles, breadcrumbs, footer secondary. - **Muted Soft** (`{colors.muted-soft}` — #a8acb3): Disabled link text. - **On Primary** (`{colors.on-primary}` — #ffffff): White text on Coinbase Blue CTAs. - **On Dark** (`{colors.on-dark}` — #ffffff): White text on dark heroes. - **On Dark Soft** (`{colors.on-dark-soft}` — #a8acb3): Muted off-white for secondary text on dark. ### Trading Semantics - **Semantic Up** (`{colors.semantic-up}` — #05b169): "Price up" green, text color only. - **Semantic Down** (`{colors.semantic-down}` — #cf202f): "Price down" red, text color only. ## Typography ### Font Family The system runs **CoinbaseDisplay** (display headlines), **CoinbaseSans** (body, navigation, captions, buttons), **CoinbaseIcons** (icon font), and **CoinbaseMono** for tabular numerical data. Fallback stack: `-apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif`. The display/body split is functional: CoinbaseDisplay carries hero headlines only; CoinbaseSans carries everything else. ### Hierarchy | Token | Size | Weight | Line Height | Letter Spacing | Use | |---|---|---|---|---|---| | `{typography.display-mega}` | 80px | 400 | 1.0 | -2px | Homepage hero h1 | | `{typography.display-xl}` | 64px | 400 | 1.0 | -1.6px | Subsidiary heroes | | `{typography.display-lg}` | 52px | 400 | 1.0 | -1.3px | Section heads | | `{typography.display-md}` | 44px | 400 | 1.09 | -1px | CTA-band headlines | | `{typography.display-sm}` | 36px | 400 | 1.11 | -0.5px | Sub-section heads — CoinbaseSans | | `{typography.title-lg}` | 32px | 400 | 1.13 | -0.4px | Card group titles | | `{typography.title-md}` | 18px | 600 | 1.33 | 0 | Component titles, asset row primary | | `{typography.title-sm}` | 16px | 600 | 1.25 | 0 | List labels | | `{typography.body-md}` | 16px | 400 | 1.5 | 0 | Default body | | `{typography.body-strong}` | 16px | 700 | 1.5 | 0 | Emphasized body | | `{typography.body-sm}` | 14px | 400 | 1.5 | 0 | Footer body | | `{typography.caption}` | 13px | 400 | 1.5 | 0 | Photo captions | | `{typography.caption-strong}` | 12px | 600 | 1.5 | 0 | Badge pill labels | | `{typography.number-display}` | 18px | 500 | 1.4 | 0 | Asset prices, percent changes — CoinbaseMono | | `{typography.button}` | 16px | 600 | 1.15 | 0 | Standard CTA pill | | `{typography.nav-link}` | 14px | 500 | 1.4 | 0 | Top-nav menu items | ### Principles - **Display weight stays at 400.** The single most distinctive typographic choice — signals "calm institutional brand" rather than "trading-platform urgency." - **Negative letter-spacing on display only.** Display uses -1px to -2px tracking; body stays at 0. - **CoinbaseMono on every number.** Asset prices, percent changes — anything tabular renders in CoinbaseMono. ### Note on Font Substitutes CoinbaseDisplay, CoinbaseSans, and CoinbaseMono are licensed Coinbase typefaces. - **CoinbaseDisplay → Inter** at weight 400, letter-spacing -1.5%. - **CoinbaseSans → Inter** at weight 400/600. - **CoinbaseMono → JetBrains Mono** or **Geist Mono** at weight 500. ## Layout ### Spacing System - **Base unit:** 4px. - **Tokens:** `{spacing.xxs}` 4px · `{spacing.xs}` 8px · `{spacing.sm}` 12px · `{spacing.base}` 16px · `{spacing.md}` 20px · `{spacing.lg}` 24px · `{spacing.xl}` 32px · `{spacing.xxl}` 48px · `{spacing.section}` 96px. - **Section padding:** `{spacing.section}` (96px) for every major editorial band. - **Card internal padding:** `{spacing.xl}` (32px) for feature cards and product-UI mockups. ### Grid & Container - **Max content width:** ~1200px centered. Hero photography full-bleed. - **Editorial body:** Single 12-column grid. - **Feature card grids:** 2-up at desktop for hero splits, 3-up for benefit grids. - **Footer:** 6-column link list at desktop. ### Whitespace Philosophy Generous editorial pacing — closer to Bloomberg or the Financial Times than to a trading dashboard. 96px between bands; cards inside bands sit 24px apart. Density lives behind login walls, not on marketing. ## Elevation & Depth | Level | Treatment | Use | |---|---|---| | Flat | No shadow, no border | 80% of surfaces | | Hairline border | 1px `{colors.hairline}` | Feature card outlines on white | | Soft drop | `0 4px 12px rgba(0, 0, 0, 0.04)` | Single shadow tier — hovered cards | | Photographic | Full-bleed product-UI mockups | Hero depth | ### Decorative Depth - **Layered product-UI cards inside dark heroes** is the most distinctive decorative pattern — a `{component.product-ui-card-dark}` floats above a darker base canvas, often with a second smaller card overlapping at an angle. - **Geometric brand illustrations** carry illustrative depth where shadows would otherwise. ## Shapes ### Border Radius Scale | Token | Value | Use | |---|---|---| | `{rounded.none}` | 0px | Reserved (essentially unused) | | `{rounded.xs}` | 4px | Inline tags | | `{rounded.sm}` | 8px | Compact rows | | `{rounded.md}` | 12px | Form inputs | | `{rounded.lg}` | 16px | Mid-size cards | | `{rounded.xl}` | 24px | Feature cards, product-UI mockups, pricing tiers | | `{rounded.pill}` | 100px | All CTA buttons, search pills, badges | | `{rounded.full}` | 9999px | Asset icon circles, avatars | Pill for interactive, card-radius (24px) for containers, full circle for icons. Sharp corners absent. ## Components ### Top Navigation **`top-nav-light`** — Default top nav on white pages. Background `{colors.canvas}`, text `{colors.ink}`, height 64px. Layout: Coinbase wordmark left, primary horizontal menu (Cryptocurrencies / Individuals / Businesses / Institutions / Developers / Company), search-icon + globe + Sign In + Sign Up CTAs right. **`top-nav-on-dark`** — Top nav over a dark hero band. Background `{colors.surface-dark}`, text `{colors.on-dark}`. Same layout. ### Buttons **`button-primary`** — The signature Coinbase Blue pill. Background `{colors.primary}`, text `{colors.on-primary}`, type `{typography.button}` (16px / 600), padding 12px × 20px, height 44px, rounded `{rounded.pill}` (100px). **`button-primary-active`** — Press state. Background `{colors.primary-active}`, deeper blue. **`button-primary-disabled`** — Faded blue tint. Background `{colors.primary-disabled}`. Cursor not-allowed. **`button-secondary-light`** — Soft-gray secondary on white surfaces. Background `{colors.surface-strong}`, text `{colors.ink}`, same pill geometry. **`button-secondary-dark`** — Used on dark heroes. Background `{colors.surface-dark-elevated}`, text `{colors.on-dark}`, same pill geometry. **`button-outline-on-dark`** — Transparent pill with white outline. Background transparent, text `{colors.on-dark}`, 1px white border. **`button-tertiary-text`** — Inline text link. Background transparent, text `{colors.primary}`, type `{typography.button}`. **`button-pill-cta`** — Larger pill CTA used on the homepage hero ("Get started"). Same Coinbase Blue palette but with 56px height and 16px × 32px padding for a prouder stance. ### Hero Bands **`hero-band-dark`** — The signature full-bleed dark hero. Background `{colors.surface-dark}`, text `{colors.on-dark}`, full-bleed layered product-UI mockup cards. Display headline left in `{typography.display-mega}` (80px / 400), subhead in `{typography.body-md}`, two CTAs. **`hero-band-light`** — White-canvas variant used on Wealth and Explore. Background `{colors.canvas}`, text `{colors.ink}`. Same skeleton, light palette. ### Cards **`product-ui-card-dark`** — The floating product-UI mockup. Background `{colors.surface-dark-elevated}`, text `{colors.on-dark}`, rounded `{rounded.xl}` (24px), padding 32px. Often shown as 2-3 stacked cards at slight rotation, mimicking a layered dashboard. **`product-ui-card-light`** — Light-canvas variant used on Explore for asset cards. Background `{colors.canvas}`, text `{colors.ink}`, same geometry, 1px hairline border. **`feature-card`** — Used in 3-up and 2-up grids. Background `{colors.canvas}`, text `{colors.ink}`, type `{typography.title-md}`, rounded `{rounded.xl}`, padding 32px. ### Trading Surfaces **`asset-row`** — Horizontal row in asset lists (Explore, Wealth). Background transparent, 1px hairline divider. Layout: 32px circular asset icon left, asset name + ticker, price column in `{typography.number-display}`, 24h change column with `{component.price-up-cell}` or `{component.price-down-cell}`. **`price-up-cell`** + **`price-down-cell`** — Inline price-change cells. Color only — green or red text in `{typography.number-display}`, no background fill. **`asset-icon-circular`** — Circular plate behind asset glyphs. Background `{colors.surface-strong}`, rounded `{rounded.full}`, 32px diameter. ### Pricing **`pricing-tier-card`** — Standard pricing tier on Developer Platform. Background `{colors.canvas}`, rounded `{rounded.xl}`, padding 32px, 1px hairline border. Layout: tier name + price + feature checklist + CTA pill. **`pricing-tier-featured`** — The featured tier. Background `{colors.surface-dark}`, text `{colors.on-dark}`. Same skeleton, dark palette — visual inversion signals "highlighted choice" without colored ribbons. ### Forms **`text-input`** — Standard text input. Background `{colors.canvas}`, text `{colors.ink}`, rounded `{rounded.md}` (12px), padding 14px × 16px, height 48px, 1px hairline border. On focus, border thickens to 2px Coinbase Blue. **`search-input-pill`** — Pill-shaped search bar. Background `{colors.surface-strong}`, rounded `{rounded.pill}`, padding 12px × 20px, height 44px. ### Tags & Badges **`badge-pill`** — Small uppercase pill used as section labels ("INSTITUTIONAL", "REGULATED"). Background `{colors.surface-strong}`, text `{colors.ink}`, type `{typography.caption-strong}`, rounded `{rounded.pill}`. ### CTA / Footer **`cta-band-dark`** — Pre-footer "Take control of your money" band. Background `{colors.surface-dark}`, text `{colors.on-dark}`, vertical padding 96px. Centered headline + two CTAs. **`footer-light`** — Closing white-canvas footer. Background `{colors.canvas}`, text `{colors.body}`. 6-column link list. **`footer-link`** — Individual footer link. Background transparent, text `{colors.body}`. **`legal-band`** — Bottom strip beneath footer columns. All text `{colors.muted}` at `{typography.caption}`. ## Do's and Don'ts ### Do - Reserve `{colors.primary}` (Coinbase Blue) for primary CTAs, wordmark, brand-glyph illustrations, inline accent links. - Set every CTA as `{rounded.pill}` (100px); every asset glyph as `{rounded.full}`. - Keep CoinbaseDisplay headlines at weight 400. - Use the dark/light band rotation as page rhythm. - Render every numerical value in CoinbaseMono via `{typography.number-display}`. - Pair every dark hero with a layered product-UI mockup card stack. ### Don't - Don't introduce a secondary brand color. Coinbase Blue is the only action color; trading green/red are semantic-only. - Don't bold display copy — display sits at weight 400; bolding shifts the brand voice. - Don't add drop shadow tiers — system has one shadow tier. - Don't use sharp `{rounded.none}` (0px) on CTAs. - Don't mix CoinbaseDisplay and CoinbaseSans inside the same headline. - Don't use trading green/red as a button background. - Don't extract a CTA color from a third-party widget (cookie consent, OneTrust). The brand's CTA color is what appears on actual product CTAs, not on injected modals. ## Responsive Behavior ### Breakpoints | Name | Width | Key Changes | |---|---|---| | Mobile | < 640px | Hero h1 80→40px; feature card grid 1-up; asset row stacks; nav collapses to hamburger; layered product-UI cards collapse to single card. | | Tablet | 640–1024px | Hero h1 64px; feature card grid 2-up; asset rows stay horizontal but compress columns. | | Desktop | 1024–1280px | Full hero h1 80px; feature card grid 3-up; full asset row layout. | | Wide | > 1280px | Content caps at 1200px; hero photography full-bleed. | ### Touch Targets - Primary CTA pill at 44px height — at WCAG AAA. - Larger hero pill (`{component.button-pill-cta}`) at 56px — well above AAA. - Asset icon circles at 32px — borderline; padded 8px row creates effective 48px tap zone. - Search pill at 44px height — at AAA. ### Collapsing Strategy - Top nav switches to hamburger sheet below 768px. Sign Up CTA stays visible. - Hero h1 steps down: 80 → 64 → 52 → 44 → 36px on smallest screens. - Layered product-UI mockup cards collapse from 2-3 stacked into a single card on mobile. - Pricing tier rows: 3-up → 2-up → 1-up. - Asset rows on mobile stack vertically: ticker line on top, price + change line beneath. ## Iteration Guide 1. Focus on a single component at a time. Reference YAML keys directly. 2. New CTAs default to `{rounded.pill}` (100px); new icon plates default to `{rounded.full}`. Cards use `{rounded.xl}`. 3. Variants live as separate entries inside the `components:` block. 4. Use `{token.refs}` everywhere — never inline hex. 5. Hover state never documented. Only Default and Active/Pressed. 6. CoinbaseDisplay 400 for display, CoinbaseSans 400/600/700 for body. CoinbaseMono on every number. 7. Coinbase Blue stays scarce — one or two blue moments per band. ## Known Gaps - CoinbaseDisplay, CoinbaseSans, CoinbaseMono are licensed; Inter and JetBrains Mono are documented substitutes. - In-product trading surfaces (order book, charts, order forms) are behind login walls — this document covers marketing only. - Animation timings out of scope. - Form validation states beyond focus not visible on captured surfaces. - Accent yellow appears only inside Bitcoin asset glyph illustrations; documented as illustrative-only.