156 lines
7.0 KiB
Markdown
156 lines
7.0 KiB
Markdown
# Design System Inspired by GitHub
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> Category: Developer Tools
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> Code-forward platform. Functional density, blue-on-white precision, Primer foundations.
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## 1. Visual Theme & Atmosphere
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GitHub's surface is engineered, not decorated. Every pixel announces a stance: this is a tool for people who care about diffs, builds, and pull requests. The page background is a clean `#ffffff` (light) or `#0d1117` (dark), with content arranged on dense rectangular panes separated by hairline borders rather than negative space. Information density is the brand — list rows, code lines, repository headers, and notification cards are all packed close together so a power user can scan a hundred items without scrolling.
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The signature accents are the **Primer blue** (`#0969da`) for links and primary actions, and **GitHub green** (`#1a7f37`) for merged states, success, and the merge button itself. Both feel slightly muted compared to consumer-product blues and greens — saturated enough to read against the dense gray text, restrained enough to disappear into the background when several appear in one viewport.
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Typography uses the **system-ui** stack across the entire product so text renders crisply on every OS, paired with **SFMono / Menlo / Consolas** for code. There is no editorial display font; GitHub's voice is the voice of the system you're already on.
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**Key Characteristics:**
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- True white canvas (`#ffffff`) or deep navy-black (`#0d1117`) — no warmth, no tint
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- Hairline gray borders (`#d0d7de`) define every pane and panel
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- Primer blue (`#0969da`) for links/primary; GitHub green (`#1a7f37`) for success/merge
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- system-ui for prose; SFMono for code — no custom typeface
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- Dense list rows with minimal padding; whitespace is rare
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- Octicon iconography at 16px / 24px — single-stroke, geometric, consistent
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- Pill-shaped status badges with strong color semantics
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## 2. Color Palette & Roles
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### Primary
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- **Canvas Default** (`#ffffff`): Primary page background, light theme.
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- **Canvas Subtle** (`#f6f8fa`): Secondary surface, sidebar, input background, header strip.
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- **Canvas Inset** (`#eaeef2`): Code block background, deep-inset surface.
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- **Fg Default** (`#1f2328`): Primary text, headlines, ink.
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- **Fg Muted** (`#656d76`): Secondary text, captions, file paths.
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### Brand Accent
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- **Primer Blue** (`#0969da`): Links, primary CTAs, focus ring base — the universal interactive color.
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- **Primer Blue Hover** (`#0550ae`): Hover/pressed for primary blue.
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- **Accent Subtle** (`#ddf4ff`): Soft blue surface for callouts, info banners.
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### Semantic
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- **Success / Merge Green** (`#1a7f37`): Merged PRs, success badges, merge button.
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- **Success Subtle** (`#dafbe1`): Success surface tint.
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- **Open Green** (`#1a7f37`): "Open" issue/PR state.
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- **Closed / Danger Red** (`#cf222e`): Closed PRs, destructive action, validation error.
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- **Danger Subtle** (`#ffebe9`): Error banner surface.
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- **Attention / Warning Yellow** (`#9a6700`): Warning text on amber surface.
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- **Attention Subtle** (`#fff8c5`): Warning banner surface.
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- **Done Purple** (`#8250df`): Merged-and-archived, "done" state, premium badge.
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- **Sponsor Pink** (`#bf3989`): Sponsors heart, GitHub sponsors brand.
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### Border & Divider
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- **Border Default** (`#d0d7de`): Standard hairline border, panel outline.
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- **Border Muted** (`#d8dee4`): Inner dividers within a panel.
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- **Border Subtle** (`#eaeef2`): Faint table row dividers.
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### Dark Theme
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- **Dark Canvas** (`#0d1117`): Dark page background.
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- **Dark Surface** (`#161b22`): Sidebar, header, secondary surface.
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- **Dark Border** (`#30363d`): Standard dark-mode border.
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- **Dark Fg** (`#e6edf3`): Primary text on dark.
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## 3. Typography Rules
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### Font Family
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- **Body / UI**: `-apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif`
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- **Code / Mono**: `ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace`
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- **Emoji**: `"Apple Color Emoji", "Segoe UI Emoji"`
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### Hierarchy
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| Role | Font | Size | Weight | Line Height | Letter Spacing | Notes |
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|------|------|------|--------|-------------|----------------|-------|
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| Display | system-ui | 32px (2rem) | 600 | 1.25 | -0.01em | Repo header, marketing hero |
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| H1 | system-ui | 24px (1.5rem) | 600 | 1.25 | normal | Page heading |
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| H2 | system-ui | 20px (1.25rem) | 600 | 1.25 | normal | Section heading |
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| H3 | system-ui | 16px (1rem) | 600 | 1.25 | normal | Sub-section, panel header |
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| Body | system-ui | 14px (0.875rem) | 400 | 1.5 | normal | Default text size — not 16px |
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| Body Small | system-ui | 12px (0.75rem) | 400 | 1.4 | normal | Captions, file metadata |
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| Code | SFMono | 12px (0.75rem) | 400 | 1.45 | normal | Code blocks, diff |
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| Code Inline | SFMono | 0.85em | 400 | inherit | normal | Inline `code` spans |
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### Principles
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- **14px body, not 16px**: GitHub's prose density is its identity. The product reads at 14px to fit more rows in a viewport.
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- **Weight binary**: 400 for everything by default; 600 for headlines and emphasis. No 500, no 700.
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- **System fonts always**: never load a webfont for chrome — text must render instantly on slow connections.
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## 4. Component Stylings
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### Buttons
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**Primary (Green)**
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- Background: `#1f883d`
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- Text: `#ffffff`
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- Border: 1px solid `rgba(31, 35, 40, 0.15)`
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- Padding: 5px 16px
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- Radius: 6px
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- Shadow: `0 1px 0 rgba(31,35,40,0.1)`
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- Hover: background `#1a7f37`
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- Use: "Create repository", "Merge pull request"
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**Default**
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- Background: `#f6f8fa`
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- Text: `#1f2328`
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- Border: 1px solid `#d0d7de`
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- Padding: 5px 16px
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- Radius: 6px
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- Hover: background `#f3f4f6`, border `#d0d7de`
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**Outline (Blue Link Style)**
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- Background: `#ffffff`
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- Text: `#0969da`
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- Border: 1px solid `#d0d7de`
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- Hover: background `#0969da`, text `#ffffff`
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**Danger**
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- Background: `#ffffff`
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- Text: `#cf222e`
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- Border: 1px solid `#d0d7de`
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- Hover: background `#a40e26`, text `#ffffff`, border `#a40e26`
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### Cards / Boxes
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- Background: `#ffffff`
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- Border: 1px solid `#d0d7de`
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- Radius: 6px
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- Padding: 16px (header) + 16px (body)
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- Header has a `#f6f8fa` strip with bottom border.
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### Inputs
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- Background: `#ffffff`
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- Border: 1px solid `#d0d7de`
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- Radius: 6px
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- Padding: 5px 12px
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- Focus: border `#0969da`, ring `0 0 0 3px rgba(9,105,218,0.3)`
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### Status Pills (Issue / PR)
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- **Open**: background `#1a7f37`, text white, padding 4px 10px, radius 9999px.
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- **Closed**: background `#cf222e`, text white.
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- **Merged**: background `#8250df`, text white.
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- **Draft**: background `#6e7781`, text white.
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### Labels (Tags on Issues/PRs)
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- Padding: 0 7px
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- Radius: 9999px
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- Font: 12px / 500
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- Background and text are programmatic (label color → text computed for contrast).
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## 5. Spacing & Layout
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- **Base unit**: 4px. Spacing scale: 4, 8, 12, 16, 24, 32, 40, 48.
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- **Page max-width**: 1280px (`Container-xl`).
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- **Sidebar**: 296px on desktop, collapses below 1012px.
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- **Row padding**: 16px horizontal, 12px vertical (lists are dense by design).
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## 6. Motion
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- **Duration**: 80ms for hover; 200ms for menu/popover open.
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- **Easing**: `ease-out` for opens, `ease-in` for closes.
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- **Avoided**: page-load animation, parallax, persistent micro-interactions. Things appear; they do not perform.
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