Design System Inspiration of HashiCorp

1. Visual Theme & Atmosphere

HashiCorp's website is enterprise infrastructure made tangible — a design system that must communicate the complexity of cloud infrastructure management while remaining approachable. The visual language splits between two modes: a clean white light-mode for informational sections and a dramatic dark-mode (#15181e, #0d0e12) for hero areas and product showcases, creating a day/night duality that mirrors the "build in light, deploy in dark" developer workflow.

The typography is anchored by a custom brand font (HashiCorp Sans, loaded as __hashicorpSans_96f0ca) that carries substantial weight — literally. Headings use 600–700 weights with tight line-heights (1.17–1.19), creating dense, authoritative text blocks that communicate enterprise confidence. The hero headline at 82px weight 600 with OpenType "kern" enabled is not decorative — it's infrastructure-grade typography.

What distinguishes HashiCorp is its multi-product color system. Each product in the portfolio has its own brand color — Terraform purple (#7b42bc), Vault yellow (#ffcf25), Waypoint teal (#14c6cb), Vagrant blue (#1868f2) — and these colors appear throughout as accent tokens via a CSS custom property system (--mds-color-*). This creates a design system within a design system: the parent brand is black-and-white with blue accents, while each child product injects its own chromatic identity.

The component system uses the mds (Markdown Design System) prefix, indicating a systematic, token-driven approach where colors, spacing, and states are all managed through CSS variables. Shadows are remarkably subtle — dual-layer micro-shadows using rgba(97, 104, 117, 0.05) that are nearly invisible but provide just enough depth to separate interactive surfaces from the background.

Key Characteristics:

• Dual-mode: clean white sections + dramatic dark (#15181e) hero/product areas
• Custom HashiCorp Sans font with 600–700 weights and "kern" feature
• Multi-product color system via --mds-color-* CSS custom properties
• Product brand colors: Terraform purple, Vault yellow, Waypoint teal, Vagrant blue
• Uppercase letter-spaced captions (13px, weight 600, 1.3px letter-spacing)
• Micro-shadows: dual-layer at 0.05 opacity — depth through whisper, not shout
• Token-driven mds component system with semantic variable names
• Tight border radius: 2px–8px, nothing pill-shaped or circular
• System-ui fallback stack for secondary text

2. Color Palette & Roles

Brand Primary

• Black (#000000): Primary brand color, text on light surfaces, --mds-color-hcp-brand
• Dark Charcoal (#15181e): Dark mode backgrounds, hero sections
• Near Black (#0d0e12): Deepest dark mode surface, form inputs on dark

Neutral Scale

• Light Gray (#f1f2f3): Light backgrounds, subtle surfaces
• Mid Gray (#d5d7db): Borders, button text on dark
• Cool Gray (#b2b6bd): Border accents (at 0.1–0.4 opacity)
• Dark Gray (#656a76): Helper text, secondary labels, --mds-form-helper-text-color
• Charcoal (#3b3d45): Secondary text on light, button borders
• Near White (#efeff1): Primary text on dark surfaces

Product Brand Colors

• Terraform Purple (#7b42bc): --mds-color-terraform-button-background
• Vault Yellow (#ffcf25): --mds-color-vault-button-background
• Waypoint Teal (#14c6cb): --mds-color-waypoint-button-background-focus
• Waypoint Teal Hover (#12b6bb): --mds-color-waypoint-button-background-hover
• Vagrant Blue (#1868f2): --mds-color-vagrant-brand
• Purple Accent (#911ced): --mds-color-palette-purple-300
• Visited Purple (#a737ff): --mds-color-foreground-action-visited

Semantic Colors

• Action Blue (#1060ff): Primary action links on dark
• Link Blue (#2264d6): Primary links on light
• Bright Blue (#2b89ff): Active links, hover accent
• Amber (#bb5a00): --mds-color-palette-amber-200, warning states
• Amber Light (#fbeabf): --mds-color-palette-amber-100, warning backgrounds
• Vault Faint Yellow (#fff9cf): --mds-color-vault-radar-gradient-faint-stop
• Orange (#a9722e): --mds-color-unified-core-orange-6
• Red (#731e25): --mds-color-unified-core-red-7, error states
• Navy (#101a59): --mds-color-unified-core-blue-7

Shadows

• Micro Shadow (rgba(97, 104, 117, 0.05) 0px 1px 1px, rgba(97, 104, 117, 0.05) 0px 2px 2px): Default card/button elevation
• Focus Outline: 3px solid var(--mds-color-focus-action-external) — systematic focus ring

3. Typography Rules

Font Families

• Primary Brand: __hashicorpSans_96f0ca (HashiCorp Sans), with fallback: __hashicorpSans_Fallback_96f0ca
• System UI: system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial

Hierarchy

Principles

• Brand/System split: HashiCorp Sans for headings and brand-critical text; system-ui for body, navigation, and functional text. The brand font carries the weight, system-ui carries the words.
• Kern always on: All HashiCorp Sans text enables OpenType "kern" — letterfitting is non-negotiable.
• Tight headings: Every heading uses 1.17–1.21 line-height, creating dense, stacked text blocks that feel infrastructural — solid, load-bearing.
• Relaxed body: Body text uses 1.50–1.69 line-height (notably generous), creating comfortable reading rhythm beneath the dense headings.
• Uppercase labels as wayfinding: 13px uppercase with 1.3px letter-spacing serves as the systematic category/section marker — always HashiCorp Sans weight 600.

4. Component Stylings

Buttons

Primary Dark

• Background: #15181e
• Text: #d5d7db
• Padding: 9px 9px 9px 15px (asymmetric, more left padding)
• Radius: 5px
• Border: 1px solid rgba(178, 182, 189, 0.4)
• Shadow: rgba(97, 104, 117, 0.05) 0px 1px 1px, rgba(97, 104, 117, 0.05) 0px 2px 2px
• Focus: 3px solid var(--mds-color-focus-action-external)
• Hover: uses --mds-color-surface-interactive token

Secondary White

• Background: #ffffff
• Text: #3b3d45
• Padding: 8px 12px
• Radius: 4px
• Hover: --mds-color-surface-interactive + low-shadow elevation
• Focus: 3px solid transparent outline
• Clean, minimal appearance

Product-Colored Buttons

• Terraform: background #7b42bc
• Vault: background #ffcf25 (dark text)
• Waypoint: background #14c6cb, hover #12b6bb
• Each product button follows the same structural pattern but uses its brand color

Badges / Pills

• Background: #42225b (deep purple)
• Text: #efeff1
• Padding: 3px 7px
• Radius: 5px
• Border: 1px solid rgb(180, 87, 255)
• Font: 16px

Inputs

Text Input (Dark Mode)

• Background: #0d0e12
• Text: #efeff1
• Border: 1px solid rgb(97, 104, 117)
• Padding: 11px
• Radius: 5px
• Focus: 3px solid var(--mds-color-focus-action-external) outline

Checkbox

• Background: #0d0e12
• Border: 1px solid rgb(97, 104, 117)
• Radius: 3px

Links

• Action Blue on Light: #2264d6, hover → blue-600 variable, underline on hover
• Action Blue on Dark: #1060ff or #2b89ff, underline on hover
• White on Dark: #ffffff, transparent underline → visible underline on hover
• Neutral on Light: #3b3d45, transparent underline → visible underline on hover
• Light on Dark: #efeff1, similar hover pattern
• All links use var(--wpl-blue-600) as hover color

Cards & Containers

• Light mode: white background, micro-shadow elevation
• Dark mode: #15181e or darker surfaces
• Radius: 8px for cards and containers
• Product showcase cards with gradient borders or accent lighting

Navigation

• Clean horizontal nav with mega-menu dropdowns
• HashiCorp logo left-aligned
• system-ui 15px weight 500 for links
• Product categories organized by lifecycle management group
• "Get started" and "Contact us" CTAs in header
• Dark mode variant for hero sections

5. Layout Principles

Spacing System

• Base unit: 8px
• Scale: 2px, 3px, 4px, 6px, 7px, 8px, 9px, 11px, 12px, 16px, 20px, 24px, 32px, 40px, 48px

Grid & Container

• Max content width: ~1150px (xl breakpoint)
• Full-width dark hero sections with contained content
• Card grids: 2–3 column layouts
• Generous horizontal padding at desktop scale

Breakpoints

Whitespace Philosophy

• Enterprise breathing room: Generous vertical spacing between sections (48px–80px+) communicates stability and seriousness.
• Dense headings, spacious body: Tight line-height headings sit above relaxed body text, creating visual "weight at the top" of each section.
• Dark as canvas: Dark hero sections use extra vertical padding to let 3D illustrations and gradients breathe.

Border Radius Scale

• Minimal (2px): Links, small inline elements
• Subtle (3px): Checkboxes, small inputs
• Standard (4px): Secondary buttons
• Comfortable (5px): Primary buttons, badges, inputs
• Card (8px): Cards, containers, images

6. Depth & Elevation

Shadow Philosophy: HashiCorp uses arguably the subtlest shadow system in modern web design. The dual-layer shadows at 5% opacity are nearly invisible — they exist not to create visual depth but to signal interactivity. If you can see the shadow, it's too strong. This restraint communicates the enterprise value of stability — nothing floats, nothing is uncertain.

7. Do's and Don'ts

Do

• Use HashiCorp Sans for headings and brand text, system-ui for body and UI text
• Enable "kern" on all HashiCorp Sans text
• Use product brand colors ONLY for their respective products (Terraform = purple, Vault = yellow, etc.)
• Apply uppercase labels at 13px weight 600 with 1.3px letter-spacing for section markers
• Keep shadows at the "whisper" level (0.05 opacity dual-layer)
• Use the --mds-color-* token system for consistent color application
• Maintain the tight-heading / relaxed-body rhythm (1.17–1.21 vs 1.50–1.69 line-heights)
• Use 3px solid focus outlines for accessibility

Don't

• Don't use product brand colors outside their product context (no Terraform purple on Vault content)
• Don't increase shadow opacity above 0.1 — the whisper level is intentional
• Don't use pill-shaped buttons (>8px radius) — the sharp, minimal radius is structural
• Don't skip the "kern" feature on headings — the font requires it
• Don't use HashiCorp Sans for small body text — it's designed for 17px+ heading use
• Don't mix product colors in the same component — each product has one color
• Don't use pure black (#000000) for dark backgrounds — use #15181e or #0d0e12
• Don't forget the asymmetric button padding — 9px 9px 9px 15px is intentional

8. Responsive Behavior

Breakpoints

Collapsing Strategy

• Hero: 82px → 52px → 42px heading sizes
• Navigation: mega-menu → hamburger
• Product cards: 3-column → 2-column → stacked
• Dark sections maintain full-width but compress padding
• Buttons: inline → full-width stacked on mobile

9. Agent Prompt Guide

Quick Color Reference

• Light bg: #ffffff, #f1f2f3
• Dark bg: #15181e, #0d0e12
• Text light: #000000, #3b3d45
• Text dark: #efeff1, #d5d7db
• Links: #2264d6 (light), #1060ff (dark), #2b89ff (active)
• Helper text: #656a76
• Borders: rgba(178, 182, 189, 0.4), rgb(97, 104, 117)
• Focus: 3px solid product-appropriate color

Example Component Prompts

• "Create a hero on dark background (#15181e). Headline at 82px HashiCorp Sans weight 600, line-height 1.17, kern enabled, white text. Sub-text at 20px system-ui weight 400, line-height 1.50, #d5d7db text. Two buttons: primary dark (#15181e, 5px radius, 9px 15px padding) and secondary white (#ffffff, 4px radius, 8px 12px padding)."
• "Design a product card: white background, 8px radius, dual-layer shadow at rgba(97,104,117,0.05). Title at 26px HashiCorp Sans weight 700, body at 16px system-ui weight 400 line-height 1.63."
• "Build an uppercase section label: 13px HashiCorp Sans weight 600, line-height 1.69, letter-spacing 1.3px, text-transform uppercase, #656a76 color."
• "Create a product-specific CTA button: Terraform → #7b42bc background, Vault → #ffcf25 with dark text, Waypoint → #14c6cb. All: 5px radius, 500 weight text, 16px system-ui."
• "Design a dark form: #0d0e12 input background, #efeff1 text, 1px solid rgb(97,104,117) border, 5px radius, 11px padding. Focus: 3px solid accent-color outline."

Iteration Guide

1. Always start with the mode decision: light (white) for informational, dark (#15181e) for hero/product
2. HashiCorp Sans for headings only (17px+), system-ui for everything else
3. Shadows are at whisper level (0.05 opacity) — if visible, reduce
4. Product colors are sacred — each product owns exactly one color
5. Focus rings are always 3px solid, color-matched to product context
6. Uppercase labels are the systematic wayfinding pattern — 13px, 600, 1.3px tracking