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

Role	Font	Size	Weight	Line Height	Letter Spacing	Notes
Display Hero	HashiCorp Sans	82px (5.13rem)	600	1.17 (tight)	normal	"kern" enabled
Section Heading	HashiCorp Sans	52px (3.25rem)	600	1.19 (tight)	normal	"kern" enabled
Feature Heading	HashiCorp Sans	42px (2.63rem)	700	1.19 (tight)	-0.42px	Negative tracking
Sub-heading	HashiCorp Sans	34px (2.13rem)	600–700	1.18 (tight)	normal	Feature blocks
Card Title	HashiCorp Sans	26px (1.63rem)	700	1.19 (tight)	normal	Card and panel headings
Small Title	HashiCorp Sans	19px (1.19rem)	700	1.21 (tight)	normal	Compact headings
Body Emphasis	HashiCorp Sans	17px (1.06rem)	600–700	1.18–1.35	normal	Bold body text
Body Large	system-ui	20px (1.25rem)	400–600	1.50	normal	Hero descriptions
Body	system-ui	16px (1.00rem)	400–500	1.63–1.69 (relaxed)	normal	Standard body text
Nav Link	system-ui	15px (0.94rem)	500	1.60 (relaxed)	normal	Navigation items
Small Body	system-ui	14px (0.88rem)	400–500	1.29–1.71	normal	Secondary content
Caption	system-ui	13px (0.81rem)	400–500	1.23–1.69	normal	Metadata, footer links
Uppercase Label	HashiCorp Sans	13px (0.81rem)	600	1.69 (relaxed)	1.3px	text-transform: uppercase

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

Name	Width	Key Changes
Mobile Small	<375px	Tight single column
Mobile	375–480px	Standard mobile
Small Tablet	480–600px	Minor adjustments
Tablet	600–768px	2-column grids begin
Small Desktop	768–992px	Full nav visible
Desktop	992–1120px	Standard layout
Large Desktop	1120–1440px	Max-width content
Ultra-wide	>1440px	Centered, generous margins

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

Level	Treatment	Use
Flat (Level 0)	No shadow	Default surfaces, text blocks
Whisper (Level 1)	rgba(97, 104, 117, 0.05) 0px 1px 1px, rgba(97, 104, 117, 0.05) 0px 2px 2px	Cards, buttons, interactive surfaces
Focus (Level 2)	3px solid var(--mds-color-focus-action-external) outline	Focus rings — color-matched to context

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

Name	Width	Key Changes
Mobile	<768px	Single column, hamburger nav, stacked CTAs
Tablet	768–992px	2-column grids, nav begins expanding
Desktop	992–1150px	Full layout, mega-menu nav
Large	>1150px	Max-width centered, generous margins

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