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+# Design System: Notion
+
+## 1. Visual Theme & Atmosphere
+
+Notion's website embodies the philosophy of the tool itself: a blank canvas that gets out of your way. The design system is built on warm neutrals rather than cold grays, creating a distinctly approachable minimalism that feels like quality paper rather than sterile glass. The page canvas is pure white (`#ffffff`) but the text isn't pure black -- it's a warm near-black (`rgba(0,0,0,0.95)`) that softens the reading experience imperceptibly. The warm gray scale (`#f6f5f4`, `#31302e`, `#615d59`, `#a39e98`) carries subtle yellow-brown undertones, giving the interface a tactile, almost analog warmth.
+
+The custom NotionInter font (a modified Inter) is the backbone of the system. At display sizes (64px), it uses aggressive negative letter-spacing (-2.125px), creating headlines that feel compressed and precise. The weight range is broader than typical systems: 400 for body, 500 for UI elements, 600 for semi-bold labels, and 700 for display headings. OpenType features `"lnum"` (lining numerals) and `"locl"` (localized forms) are enabled on larger text, adding typographic sophistication that rewards close reading.
+
+What makes Notion's visual language distinctive is its border philosophy. Rather than heavy borders or shadows, Notion uses ultra-thin `1px solid rgba(0,0,0,0.1)` borders -- borders that exist as whispers, barely perceptible division lines that create structure without weight. The shadow system is equally restrained: multi-layer stacks with cumulative opacity never exceeding 0.05, creating depth that's felt rather than seen.
+
+**Key Characteristics:**
+- NotionInter (modified Inter) with negative letter-spacing at display sizes (-2.125px at 64px)
+- Warm neutral palette: grays carry yellow-brown undertones (`#f6f5f4` warm white, `#31302e` warm dark)
+- Near-black text via `rgba(0,0,0,0.95)` -- not pure black, creating micro-warmth
+- Ultra-thin borders: `1px solid rgba(0,0,0,0.1)` throughout -- whisper-weight division
+- Multi-layer shadow stacks with sub-0.05 opacity for barely-there depth
+- Notion Blue (`#0075de`) as the singular accent color for CTAs and interactive elements
+- Pill badges (9999px radius) with tinted blue backgrounds for status indicators
+- 8px base spacing unit with an organic, non-rigid scale
+
+## 2. Color Palette & Roles
+
+### Primary
+- **Notion Black** (`rgba(0,0,0,0.95)` / `#000000f2`): Primary text, headings, body copy. The 95% opacity softens pure black without sacrificing readability.
+- **Pure White** (`#ffffff`): Page background, card surfaces, button text on blue.
+- **Notion Blue** (`#0075de`): Primary CTA, link color, interactive accent -- the only saturated color in the core UI chrome.
+
+### Brand Secondary
+- **Deep Navy** (`#213183`): Secondary brand color, used sparingly for emphasis and dark feature sections.
+- **Active Blue** (`#005bab`): Button active/pressed state -- darker variant of Notion Blue.
+
+### Warm Neutral Scale
+- **Warm White** (`#f6f5f4`): Background surface tint, section alternation, subtle card fill. The yellow undertone is key.
+- **Warm Dark** (`#31302e`): Dark surface background, dark section text. Warmer than standard grays.
+- **Warm Gray 500** (`#615d59`): Secondary text, descriptions, muted labels.
+- **Warm Gray 300** (`#a39e98`): Placeholder text, disabled states, caption text.
+
+### Semantic Accent Colors
+- **Teal** (`#2a9d99`): Success states, positive indicators.
+- **Green** (`#1aae39`): Confirmation, completion badges.
+- **Orange** (`#dd5b00`): Warning states, attention indicators.
+- **Pink** (`#ff64c8`): Decorative accent, feature highlights.
+- **Purple** (`#391c57`): Premium features, deep accents.
+- **Brown** (`#523410`): Earthy accent, warm feature sections.
+
+### Interactive
+- **Link Blue** (`#0075de`): Primary link color with underline-on-hover.
+- **Link Light Blue** (`#62aef0`): Lighter link variant for dark backgrounds.
+- **Focus Blue** (`#097fe8`): Focus ring on interactive elements.
+- **Badge Blue Bg** (`#f2f9ff`): Pill badge background, tinted blue surface.
+- **Badge Blue Text** (`#097fe8`): Pill badge text, darker blue for readability.
+
+### Shadows & Depth
+- **Card Shadow** (`rgba(0,0,0,0.04) 0px 4px 18px, rgba(0,0,0,0.027) 0px 2.025px 7.84688px, rgba(0,0,0,0.02) 0px 0.8px 2.925px, rgba(0,0,0,0.01) 0px 0.175px 1.04062px`): Multi-layer card elevation.
+- **Deep Shadow** (`rgba(0,0,0,0.01) 0px 1px 3px, rgba(0,0,0,0.02) 0px 3px 7px, rgba(0,0,0,0.02) 0px 7px 15px, rgba(0,0,0,0.04) 0px 14px 28px, rgba(0,0,0,0.05) 0px 23px 52px`): Five-layer deep elevation for modals and featured content.
+- **Whisper Border** (`1px solid rgba(0,0,0,0.1)`): Standard division border -- cards, dividers, sections.
+
+## 3. Typography Rules
+
+### Font Family
+- **Primary**: `NotionInter`, with fallbacks: `Inter, -apple-system, system-ui, Segoe UI, Helvetica, Apple Color Emoji, Arial, Segoe UI Emoji, Segoe UI Symbol`
+- **OpenType Features**: `"lnum"` (lining numerals) and `"locl"` (localized forms) enabled on display and heading text.
+
+### Hierarchy
+
+| Role | Font | Size | Weight | Line Height | Letter Spacing | Notes |
+|------|------|------|--------|-------------|----------------|-------|
+| Display Hero | NotionInter | 64px (4.00rem) | 700 | 1.00 (tight) | -2.125px | Maximum compression, billboard headlines |
+| Display Secondary | NotionInter | 54px (3.38rem) | 700 | 1.04 (tight) | -1.875px | Secondary hero, feature headlines |
+| Section Heading | NotionInter | 48px (3.00rem) | 700 | 1.00 (tight) | -1.5px | Feature section titles, with `"lnum"` |
+| Sub-heading Large | NotionInter | 40px (2.50rem) | 700 | 1.50 | normal | Card headings, feature sub-sections |
+| Sub-heading | NotionInter | 26px (1.63rem) | 700 | 1.23 (tight) | -0.625px | Section sub-titles, content headers |
+| Card Title | NotionInter | 22px (1.38rem) | 700 | 1.27 (tight) | -0.25px | Feature cards, list titles |
+| Body Large | NotionInter | 20px (1.25rem) | 600 | 1.40 | -0.125px | Introductions, feature descriptions |
+| Body | NotionInter | 16px (1.00rem) | 400 | 1.50 | normal | Standard reading text |
+| Body Medium | NotionInter | 16px (1.00rem) | 500 | 1.50 | normal | Navigation, emphasized UI text |
+| Body Semibold | NotionInter | 16px (1.00rem) | 600 | 1.50 | normal | Strong labels, active states |
+| Body Bold | NotionInter | 16px (1.00rem) | 700 | 1.50 | normal | Headlines at body size |
+| Nav / Button | NotionInter | 15px (0.94rem) | 600 | 1.33 | normal | Navigation links, button text |
+| Caption | NotionInter | 14px (0.88rem) | 500 | 1.43 | normal | Metadata, secondary labels |
+| Caption Light | NotionInter | 14px (0.88rem) | 400 | 1.43 | normal | Body captions, descriptions |
+| Badge | NotionInter | 12px (0.75rem) | 600 | 1.33 | 0.125px | Pill badges, tags, status labels |
+| Micro Label | NotionInter | 12px (0.75rem) | 400 | 1.33 | 0.125px | Small metadata, timestamps |
+
+### Principles
+- **Compression at scale**: NotionInter at display sizes uses -2.125px letter-spacing at 64px, progressively relaxing to -0.625px at 26px and normal at 16px. The compression creates density at headlines while maintaining readability at body sizes.
+- **Four-weight system**: 400 (body/reading), 500 (UI/interactive), 600 (emphasis/navigation), 700 (headings/display). The broader weight range compared to most systems allows nuanced hierarchy.
+- **Warm scaling**: Line height tightens as size increases -- 1.50 at body (16px), 1.23-1.27 at sub-headings, 1.00-1.04 at display. This creates denser, more impactful headlines.
+- **Badge micro-tracking**: The 12px badge text uses positive letter-spacing (0.125px) -- the only positive tracking in the system, creating wider, more legible small text.
+
+## 4. Component Stylings
+
+### Buttons
+
+**Primary Blue**
+- Background: `#0075de` (Notion Blue)
+- Text: `#ffffff`
+- Padding: 8px 16px
+- Radius: 4px (subtle)
+- Border: `1px solid transparent`
+- Hover: background darkens to `#005bab`
+- Active: scale(0.9) transform
+- Focus: `2px solid` focus outline, `var(--shadow-level-200)` shadow
+- Use: Primary CTA ("Get Notion free", "Try it")
+
+**Secondary / Tertiary**
+- Background: `rgba(0,0,0,0.05)` (translucent warm gray)
+- Text: `#000000` (near-black)
+- Padding: 8px 16px
+- Radius: 4px
+- Hover: text color shifts, scale(1.05)
+- Active: scale(0.9) transform
+- Use: Secondary actions, form submissions
+
+**Ghost / Link Button**
+- Background: transparent
+- Text: `rgba(0,0,0,0.95)`
+- Decoration: underline on hover
+- Use: Tertiary actions, inline links
+
+**Pill Badge Button**
+- Background: `#f2f9ff` (tinted blue)
+- Text: `#097fe8`
+- Padding: 4px 8px
+- Radius: 9999px (full pill)
+- Font: 12px weight 600
+- Use: Status badges, feature labels, "New" tags
+
+### Cards & Containers
+- Background: `#ffffff`
+- Border: `1px solid rgba(0,0,0,0.1)` (whisper border)
+- Radius: 12px (standard cards), 16px (featured/hero cards)
+- Shadow: `rgba(0,0,0,0.04) 0px 4px 18px, rgba(0,0,0,0.027) 0px 2.025px 7.84688px, rgba(0,0,0,0.02) 0px 0.8px 2.925px, rgba(0,0,0,0.01) 0px 0.175px 1.04062px`
+- Hover: subtle shadow intensification
+- Image cards: 12px top radius, image fills top half
+
+### Inputs & Forms
+- Background: `#ffffff`
+- Text: `rgba(0,0,0,0.9)`
+- Border: `1px solid #dddddd`
+- Padding: 6px
+- Radius: 4px
+- Focus: blue outline ring
+- Placeholder: warm gray `#a39e98`
+
+### Navigation
+- Clean horizontal nav on white, not sticky
+- Brand logo left-aligned (33x34px icon + wordmark)
+- Links: NotionInter 15px weight 500-600, near-black text
+- Hover: color shift to `var(--color-link-primary-text-hover)`
+- CTA: blue pill button ("Get Notion free") right-aligned
+- Mobile: hamburger menu collapse
+- Product dropdowns with multi-level categorized menus
+
+### Image Treatment
+- Product screenshots with `1px solid rgba(0,0,0,0.1)` border
+- Top-rounded images: `12px 12px 0px 0px` radius
+- Dashboard/workspace preview screenshots dominate feature sections
+- Warm gradient backgrounds behind hero illustrations (decorative character illustrations)
+
+### Distinctive Components
+
+**Feature Cards with Illustrations**
+- Large illustrative headers (The Great Wave, product UI screenshots)
+- 12px radius card with whisper border
+- Title at 22px weight 700, description at 16px weight 400
+- Warm white (`#f6f5f4`) background variant for alternating sections
+
+**Trust Bar / Logo Grid**
+- Company logos (trusted teams section) in their brand colors
+- Horizontal scroll or grid layout with team counts
+- Metric display: large number + description pattern
+
+**Metric Cards**
+- Large number display (e.g., "$4,200 ROI")
+- NotionInter 40px+ weight 700 for the metric
+- Description below in warm gray body text
+- Whisper-bordered card container
+
+## 5. Layout Principles
+
+### Spacing System
+- Base unit: 8px
+- Scale: 2px, 3px, 4px, 5px, 6px, 7px, 8px, 11px, 12px, 14px, 16px, 24px, 32px
+- Non-rigid organic scale with fractional values (5.6px, 6.4px) for micro-adjustments
+
+### Grid & Container
+- Max content width: approximately 1200px
+- Hero: centered single-column with generous top padding (80-120px)
+- Feature sections: 2-3 column grids for cards
+- Full-width warm white (`#f6f5f4`) section backgrounds for alternation
+- Code/dashboard screenshots as contained with whisper border
+
+### Whitespace Philosophy
+- **Generous vertical rhythm**: 64-120px between major sections. Notion lets content breathe with vast vertical padding.
+- **Warm alternation**: White sections alternate with warm white (`#f6f5f4`) sections, creating gentle visual rhythm without harsh color breaks.
+- **Content-first density**: Body text blocks are compact (line-height 1.50) but surrounded by ample margin, creating islands of readable content in a sea of white space.
+
+### Border Radius Scale
+- Micro (4px): Buttons, inputs, functional interactive elements
+- Subtle (5px): Links, list items, menu items
+- Standard (8px): Small cards, containers, inline elements
+- Comfortable (12px): Standard cards, feature containers, image tops
+- Large (16px): Hero cards, featured content, promotional blocks
+- Full Pill (9999px): Badges, pills, status indicators
+- Circle (100%): Tab indicators, avatars
+
+## 6. Depth & Elevation
+
+| Level | Treatment | Use |
+|-------|-----------|-----|
+| Flat (Level 0) | No shadow, no border | Page background, text blocks |
+| Whisper (Level 1) | `1px solid rgba(0,0,0,0.1)` | Standard borders, card outlines, dividers |
+| Soft Card (Level 2) | 4-layer shadow stack (max opacity 0.04) | Content cards, feature blocks |
+| Deep Card (Level 3) | 5-layer shadow stack (max opacity 0.05, 52px blur) | Modals, featured panels, hero elements |
+| Focus (Accessibility) | `2px solid var(--focus-color)` outline | Keyboard focus on all interactive elements |
+
+**Shadow Philosophy**: Notion's shadow system uses multiple layers with extremely low individual opacity (0.01 to 0.05) that accumulate into soft, natural-looking elevation. The 4-layer card shadow spans from 1.04px to 18px blur, creating a gradient of depth rather than a single hard shadow. The 5-layer deep shadow extends to 52px blur at 0.05 opacity, producing ambient occlusion that feels like natural light rather than computer-generated depth. This layered approach makes elements feel embedded in the page rather than floating above it.
+
+### Decorative Depth
+- Hero section: decorative character illustrations (playful, hand-drawn style)
+- Section alternation: white to warm white (`#f6f5f4`) background shifts
+- No hard section borders -- separation comes from background color changes and spacing
+
+## 7. Responsive Behavior
+
+### Breakpoints
+| Name | Width | Key Changes |
+|------|-------|-------------|
+| Mobile Small | <400px | Tight single column, minimal padding |
+| Mobile | 400-600px | Standard mobile, stacked layout |
+| Tablet Small | 600-768px | 2-column grids begin |
+| Tablet | 768-1080px | Full card grids, expanded padding |
+| Desktop Small | 1080-1200px | Standard desktop layout |
+| Desktop | 1200-1440px | Full layout, maximum content width |
+| Large Desktop | >1440px | Centered, generous margins |
+
+### Touch Targets
+- Buttons use comfortable padding (8px-16px vertical)
+- Navigation links at 15px with adequate spacing
+- Pill badges have 8px horizontal padding for tap targets
+- Mobile menu toggle uses standard hamburger button
+
+### Collapsing Strategy
+- Hero: 64px display -> scales to 40px -> 26px on mobile, maintains proportional letter-spacing
+- Navigation: horizontal links + blue CTA -> hamburger menu
+- Feature cards: 3-column -> 2-column -> single column stacked
+- Product screenshots: maintain aspect ratio with responsive images
+- Trust bar logos: grid -> horizontal scroll on mobile
+- Footer: multi-column -> stacked single column
+- Section spacing: 80px+ -> 48px on mobile
+
+### Image Behavior
+- Workspace screenshots maintain whisper border at all sizes
+- Hero illustrations scale proportionally
+- Product screenshots use responsive images with consistent border radius
+- Full-width warm white sections maintain edge-to-edge treatment
+
+## 8. Accessibility & States
+
+### Focus System
+- All interactive elements receive visible focus indicators
+- Focus outline: `2px solid` with focus color + shadow level 200
+- Tab navigation supported throughout all interactive components
+- High contrast text: near-black on white exceeds WCAG AAA (>14:1 ratio)
+
+### Interactive States
+- **Default**: Standard appearance with whisper borders
+- **Hover**: Color shift on text, scale(1.05) on buttons, underline on links
+- **Active/Pressed**: scale(0.9) transform, darker background variant
+- **Focus**: Blue outline ring with shadow reinforcement
+- **Disabled**: Warm gray (`#a39e98`) text, reduced opacity
+
+### Color Contrast
+- Primary text (rgba(0,0,0,0.95)) on white: ~18:1 ratio
+- Secondary text (#615d59) on white: ~5.5:1 ratio (WCAG AA)
+- Blue CTA (#0075de) on white: ~4.6:1 ratio (WCAG AA for large text)
+- Badge text (#097fe8) on badge bg (#f2f9ff): ~4.5:1 ratio (WCAG AA for large text)
+
+## 9. Agent Prompt Guide
+
+### Quick Color Reference
+- Primary CTA: Notion Blue (`#0075de`)
+- Background: Pure White (`#ffffff`)
+- Alt Background: Warm White (`#f6f5f4`)
+- Heading text: Near-Black (`rgba(0,0,0,0.95)`)
+- Body text: Near-Black (`rgba(0,0,0,0.95)`)
+- Secondary text: Warm Gray 500 (`#615d59`)
+- Muted text: Warm Gray 300 (`#a39e98`)
+- Border: `1px solid rgba(0,0,0,0.1)`
+- Link: Notion Blue (`#0075de`)
+- Focus ring: Focus Blue (`#097fe8`)
+
+### Example Component Prompts
+- "Create a hero section on white background. Headline at 64px NotionInter weight 700, line-height 1.00, letter-spacing -2.125px, color rgba(0,0,0,0.95). Subtitle at 20px weight 600, line-height 1.40, color #615d59. Blue CTA button (#0075de, 4px radius, 8px 16px padding, white text) and ghost button (transparent bg, near-black text, underline on hover)."
+- "Design a card: white background, 1px solid rgba(0,0,0,0.1) border, 12px radius. Use shadow stack: rgba(0,0,0,0.04) 0px 4px 18px, rgba(0,0,0,0.027) 0px 2.025px 7.85px, rgba(0,0,0,0.02) 0px 0.8px 2.93px, rgba(0,0,0,0.01) 0px 0.175px 1.04px. Title at 22px NotionInter weight 700, letter-spacing -0.25px. Body at 16px weight 400, color #615d59."
+- "Build a pill badge: #f2f9ff background, #097fe8 text, 9999px radius, 4px 8px padding, 12px NotionInter weight 600, letter-spacing 0.125px."
+- "Create navigation: white header. NotionInter 15px weight 600 for links, near-black text. Blue pill CTA 'Get Notion free' right-aligned (#0075de bg, white text, 4px radius)."
+- "Design an alternating section layout: white sections alternate with warm white (#f6f5f4) sections. Each section has 64-80px vertical padding, max-width 1200px centered. Section heading at 48px weight 700, line-height 1.00, letter-spacing -1.5px."
+
+### Iteration Guide
+1. Always use warm neutrals -- Notion's grays have yellow-brown undertones (#f6f5f4, #31302e, #615d59, #a39e98), never blue-gray
+2. Letter-spacing scales with font size: -2.125px at 64px, -1.875px at 54px, -0.625px at 26px, normal at 16px
+3. Four weights: 400 (read), 500 (interact), 600 (emphasize), 700 (announce)
+4. Borders are whispers: 1px solid rgba(0,0,0,0.1) -- never heavier
+5. Shadows use 4-5 layers with individual opacity never exceeding 0.05
+6. The warm white (#f6f5f4) section background is essential for visual rhythm
+7. Pill badges (9999px) for status/tags, 4px radius for buttons and inputs
+8. Notion Blue (#0075de) is the only saturated color in core UI -- use it sparingly for CTAs and links