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+# Design System: Sanity
+
+## 1. Visual Theme & Atmosphere
+
+Sanity's website is a developer-content platform rendered as a nocturnal command center -- dark, precise, and deeply structured. The entire experience sits on a near-black canvas (`#0b0b0b`) that reads less like a "dark mode toggle" and more like the natural state of a tool built for people who live in terminals. Where most CMS marketing pages reach for friendly pastels and soft illustration, Sanity leans into the gravity of its own product: structured content deserves a structured stage.
+
+The signature typographic voice is waldenburgNormal -- a distinctive, slightly geometric sans-serif with tight negative letter-spacing (-0.32px to -4.48px at display sizes) that gives headlines a compressed, engineered quality. At 112px hero scale with -4.48px tracking, the type feels almost machined -- like precision-cut steel letterforms. This is paired with IBM Plex Mono for code and technical labels, creating a dual-register voice: editorial authority meets developer credibility.
+
+What makes Sanity distinctive is the interplay between its monochromatic dark palette and vivid, saturated accent punctuation. The neutral scale runs from pure black through a tightly controlled gray ramp (`#0b0b0b` -> `#212121` -> `#353535` -> `#797979` -> `#b9b9b9` -> `#ededed` -> `#ffffff`) with no warm or cool bias -- just pure, achromatic precision. Against this disciplined backdrop, a neon green accent (display-p3 green) and electric blue (`#0052ef`) land with the impact of signal lights in a dark control room. The orange-red CTA (`#f36458`) provides the only warm touch in an otherwise cool system.
+
+**Key Characteristics:**
+- Near-black canvas (`#0b0b0b`) as the default, natural environment -- not a dark "mode" but the primary identity
+- waldenburgNormal with extreme negative tracking at display sizes, creating a precision-engineered typographic voice
+- Pure achromatic gray scale -- no warm or cool undertones, pure neutral discipline
+- Vivid accent punctuation: neon green, electric blue (`#0052ef`), and coral-red (`#f36458`) against the dark field
+- Pill-shaped primary buttons (99999px radius) contrasting with subtle rounded rectangles (3-6px) for secondary actions
+- IBM Plex Mono as the technical counterweight to the editorial display face
+- Full-bleed dark sections with content contained in measured max-width containers
+- Hover states that shift to electric blue (`#0052ef`) across all interactive elements -- a consistent "activation" signal
+
+## 2. Color Palette & Roles
+
+### Primary Brand
+- **Sanity Black** (`#0b0b0b`): The primary canvas and dominant surface color. Not pure black but close enough to feel absolute. The foundation of the entire visual identity.
+- **Pure Black** (`#000000`): Used for maximum-contrast moments, deep overlays, and certain border accents.
+- **Sanity Red** (`#f36458`): The primary CTA and brand accent -- a warm coral-red that serves as the main call-to-action color. Used for "Get Started" buttons and primary conversion points.
+
+### Accent & Interactive
+- **Electric Blue** (`#0052ef`): The universal hover/active state color across the entire system. Buttons, links, and interactive elements all shift to this blue on hover. Also used as `--color-blue-700` for focus rings and active states.
+- **Light Blue** (`#55beff` / `#afe3ff`): Secondary blue variants used for accent backgrounds, badges, and dimmed blue surfaces.
+- **Neon Green** (`color(display-p3 .270588 1 0)`): A vivid, wide-gamut green used as `--color-fg-accent-green` for success states and premium feature highlights. Falls back to `#19d600` in sRGB.
+- **Accent Magenta** (`color(display-p3 .960784 0 1)`): A vivid wide-gamut magenta for specialized accent moments.
+
+### Surface & Background
+- **Near Black** (`#0b0b0b`): Default page background and primary surface.
+- **Dark Gray** (`#212121`): Elevated surface color for cards, secondary containers, input backgrounds, and subtle layering above the base canvas.
+- **Medium Dark** (`#353535`): Tertiary surface and border color for creating depth between dark layers.
+- **Pure White** (`#ffffff`): Used for inverted sections, light-on-dark text, and specific button surfaces.
+- **Light Gray** (`#ededed`): Light surface for inverted/light sections and subtle background tints.
+
+### Neutrals & Text
+- **White** (`#ffffff`): Primary text color on dark surfaces, maximum legibility.
+- **Silver** (`#b9b9b9`): Secondary text, body copy on dark surfaces, muted descriptions, and placeholder text.
+- **Medium Gray** (`#797979`): Tertiary text, metadata, timestamps, and de-emphasized content.
+- **Charcoal** (`#212121`): Text on light/inverted surfaces.
+- **Near Black Text** (`#0b0b0b`): Primary text on white/light button surfaces.
+
+### Semantic
+- **Error Red** (`#dd0000`): Destructive actions, validation errors, and critical warnings -- a pure, high-saturation red.
+- **GPC Green** (`#37cd84`): Privacy/compliance indicator green.
+- **Focus Ring Blue** (`#0052ef`): Focus ring color for accessibility, matching the interactive blue.
+
+### Border System
+- **Dark Border** (`#0b0b0b`): Primary border on dark containers -- barely visible, maintaining minimal containment.
+- **Subtle Border** (`#212121`): Standard border for inputs, textareas, and card edges on dark surfaces.
+- **Medium Border** (`#353535`): More visible borders for emphasized containment and dividers.
+- **Light Border** (`#ffffff`): Border on inverted/light elements or buttons needing contrast separation.
+- **Orange Border** (`color(display-p3 1 0.3333 0)`): Special accent border for highlighted/featured elements.
+
+## 3. Typography Rules
+
+### Font Family
+- **Display / Headline**: `waldenburgNormal`, fallback: `waldenburgNormal Fallback, ui-sans-serif, system-ui`
+- **Body / UI**: `waldenburgNormal`, fallback: `waldenburgNormal Fallback, ui-sans-serif, system-ui`
+- **Code / Technical**: `IBM Plex Mono`, fallback: `ibmPlexMono Fallback, ui-monospace`
+- **Fallback / CJK**: `Helvetica`, fallback: `Arial, Hiragino Sans GB, STXihei, Microsoft YaHei, WenQuanYi Micro Hei`
+
+*Note: waldenburgNormal is a custom typeface. For external implementations, use Inter or Space Grotesk as the sans substitute (geometric, slightly condensed feel). IBM Plex Mono is available on Google Fonts.*
+
+### Hierarchy
+
+| Role | Font | Size | Weight | Line Height | Letter Spacing | Notes |
+|------|------|------|--------|-------------|----------------|-------|
+| Display / Hero | waldenburgNormal | 112px (7rem) | 400 | 1.00 (tight) | -4.48px | Maximum impact, compressed tracking |
+| Hero Secondary | waldenburgNormal | 72px (4.5rem) | 400 | 1.05 (tight) | -2.88px | Large section headers |
+| Section Heading | waldenburgNormal | 48px (3rem) | 400 | 1.08 (tight) | -1.68px | Primary section anchors |
+| Heading Large | waldenburgNormal | 38px (2.38rem) | 400 | 1.10 (tight) | -1.14px | Feature section titles |
+| Heading Medium | waldenburgNormal | 32px (2rem) | 425 | 1.24 (tight) | -0.32px | Card titles, subsection headers |
+| Heading Small | waldenburgNormal | 24px (1.5rem) | 425 | 1.24 (tight) | -0.24px | Smaller feature headings |
+| Subheading | waldenburgNormal | 20px (1.25rem) | 425 | 1.13 (tight) | -0.2px | Sub-section markers |
+| Body Large | waldenburgNormal | 18px (1.13rem) | 400 | 1.50 | -0.18px | Intro paragraphs, descriptions |
+| Body | waldenburgNormal | 16px (1rem) | 400 | 1.50 | normal | Standard body text |
+| Body Small | waldenburgNormal | 15px (0.94rem) | 400 | 1.50 | -0.15px | Compact body text |
+| Caption | waldenburgNormal | 13px (0.81rem) | 400-500 | 1.30-1.50 | -0.13px | Metadata, descriptions, tags |
+| Small Caption | waldenburgNormal | 12px (0.75rem) | 400 | 1.50 | -0.12px | Footnotes, timestamps |
+| Micro / Label | waldenburgNormal | 11px (0.69rem) | 500-600 | 1.00-1.50 | normal | Uppercase labels, tiny badges |
+| Code Body | IBM Plex Mono | 15px (0.94rem) | 400 | 1.50 | normal | Code blocks, technical content |
+| Code Caption | IBM Plex Mono | 13px (0.81rem) | 400-500 | 1.30-1.50 | normal | Inline code, small technical labels |
+| Code Micro | IBM Plex Mono | 10-12px | 400 | 1.30-1.50 | normal | Tiny code labels, uppercase tags |
+
+### Principles
+- **Extreme negative tracking at scale**: Display headings at 72px+ use aggressive negative letter-spacing (-2.88px to -4.48px), creating a tight, engineered quality that distinguishes Sanity from looser editorial typography.
+- **Single font, multiple registers**: waldenburgNormal handles both editorial display and functional UI text. The weight range is narrow (400-425 for most, 500-600 only for tiny labels), keeping the voice consistent.
+- **OpenType feature control**: Typography uses deliberate feature settings including `"cv01", "cv11", "cv12", "cv13", "ss07"` for display sizes and `"calt" 0` for body text, fine-tuning character alternates for different contexts.
+- **Tight headings, relaxed body**: Headings use 1.00-1.24 line-height (extremely tight), while body text breathes at 1.50. This contrast creates clear visual hierarchy.
+- **Uppercase for technical labels**: IBM Plex Mono captions and small labels frequently use `text-transform: uppercase` with tight line-heights, creating a "system readout" aesthetic for technical metadata.
+
+## 4. Component Stylings
+
+### Buttons
+
+**Primary CTA (Pill)**
+- Background: Sanity Red (`#f36458`)
+- Text: White (`#ffffff`)
+- Padding: 8px 16px
+- Border Radius: 99999px (full pill)
+- Border: none
+- Hover: Electric Blue (`#0052ef`) background, white text
+- Font: 16px waldenburgNormal, weight 400
+
+**Secondary (Dark Pill)**
+- Background: Near Black (`#0b0b0b`)
+- Text: Silver (`#b9b9b9`)
+- Padding: 8px 12px
+- Border Radius: 99999px (full pill)
+- Border: none
+- Hover: Electric Blue (`#0052ef`) background, white text
+
+**Outlined (Light Pill)**
+- Background: White (`#ffffff`)
+- Text: Near Black (`#0b0b0b`)
+- Padding: 8px
+- Border Radius: 99999px (full pill)
+- Border: 1px solid `#0b0b0b`
+- Hover: Electric Blue (`#0052ef`) background, white text
+
+**Ghost / Subtle**
+- Background: Dark Gray (`#212121`)
+- Text: Silver (`#b9b9b9`)
+- Padding: 0px 12px
+- Border Radius: 5px
+- Border: 1px solid `#212121`
+- Hover: Electric Blue (`#0052ef`) background, white text
+
+**Uppercase Label Button**
+- Font: 11px waldenburgNormal, weight 600, uppercase
+- Background: transparent or `#212121`
+- Text: Silver (`#b9b9b9`)
+- Letter-spacing: normal
+- Used for tab-like navigation and filter controls
+
+### Cards
+
+**Dark Content Card**
+- Background: `#212121`
+- Border: 1px solid `#353535` or `#212121`
+- Border Radius: 6px
+- Padding: 24px
+- Text: White (`#ffffff`) for titles, Silver (`#b9b9b9`) for body
+- Hover: subtle border color shift or elevation change
+
+**Feature Card (Full-bleed)**
+- Background: `#0b0b0b` or full-bleed image/gradient
+- Border: none or 1px solid `#212121`
+- Border Radius: 12px
+- Padding: 32-48px
+- Contains large imagery with overlaid text
+
+### Inputs
+
+**Text Input / Textarea**
+- Background: Near Black (`#0b0b0b`)
+- Text: Silver (`#b9b9b9`)
+- Border: 1px solid `#212121`
+- Padding: 8px 12px
+- Border Radius: 3px
+- Focus: outline with `var(--focus-ring-color)` (blue), 2px solid
+- Focus background: shifts to deep cyan (`#072227`)
+
+**Search Input**
+- Background: `#0b0b0b`
+- Text: Silver (`#b9b9b9`)
+- Padding: 0px 12px
+- Border Radius: 3px
+- Placeholder: Medium Gray (`#797979`)
+
+### Navigation
+
+**Top Navigation**
+- Background: Near Black (`#0b0b0b`) with backdrop blur
+- Height: auto, compact padding
+- Logo: left-aligned, Sanity wordmark
+- Links: waldenburgNormal 16px, Silver (`#b9b9b9`)
+- Link Hover: Electric Blue via `--color-fg-accent-blue`
+- CTA Button: Sanity Red pill button right-aligned
+- Separator: 1px border-bottom `#212121`
+
+**Footer**
+- Background: Near Black (`#0b0b0b`)
+- Multi-column link layout
+- Links: Silver (`#b9b9b9`), hover to blue
+- Section headers: White (`#ffffff`), 13px uppercase IBM Plex Mono
+
+### Badges / Pills
+
+**Neutral Subtle**
+- Background: White (`#ffffff`)
+- Text: Near Black (`#0b0b0b`)
+- Padding: 8px
+- Font: 13px
+- Border Radius: 99999px
+
+**Neutral Filled**
+- Background: Near Black (`#0b0b0b`)
+- Text: White (`#ffffff`)
+- Padding: 8px
+- Font: 13px
+- Border Radius: 99999px
+
+## 5. Layout Principles
+
+### Spacing System
+Base unit: **8px**
+
+| Token | Value | Usage |
+|-------|-------|-------|
+| space-1 | 1px | Hairline gaps, border-like spacing |
+| space-2 | 2px | Minimal internal padding |
+| space-3 | 4px | Tight component internal spacing |
+| space-4 | 6px | Small element gaps |
+| space-5 | 8px | Base unit -- button padding, input padding, badge padding |
+| space-6 | 12px | Standard component gap, button horizontal padding |
+| space-7 | 16px | Section internal padding, card spacing |
+| space-8 | 24px | Large component padding, card internal spacing |
+| space-9 | 32px | Section padding, container gutters |
+| space-10 | 48px | Large section vertical spacing |
+| space-11 | 64px | Major section breaks |
+| space-12 | 96-120px | Hero vertical padding, maximum section spacing |
+
+### Grid & Container
+- Max content width: ~1440px (inferred from breakpoints)
+- Page gutter: 32px on desktop, 16px on mobile
+- Content sections use full-bleed backgrounds with centered, max-width content
+- Multi-column layouts: 2-3 columns on desktop, single column on mobile
+- Card grids: CSS Grid with consistent gaps (16-24px)
+
+### Whitespace Philosophy
+Sanity uses aggressive vertical spacing between sections (64-120px) to create breathing room on the dark canvas. Within sections, spacing is tighter (16-32px), creating dense information clusters separated by generous voids. This rhythm gives the page a "slides" quality -- each section feels like its own focused frame.
+
+### Border Radius Scale
+
+| Token | Value | Usage |
+|-------|-------|-------|
+| radius-xs | 3px | Inputs, textareas, subtle rounding |
+| radius-sm | 4-5px | Secondary buttons, small cards, tags |
+| radius-md | 6px | Standard cards, containers |
+| radius-lg | 12px | Large cards, feature containers, forms |
+| radius-pill | 99999px | Primary buttons, badges, nav pills |
+
+## 6. Depth & Elevation
+
+### Shadow System
+
+| Level | Value | Usage |
+|-------|-------|-------|
+| Level 0 (Flat) | none | Default state for most elements -- dark surfaces create depth through color alone |
+| Level 1 (Subtle) | 0px 0px 0px 1px `#212121` | Border-like shadow for minimal containment without visible borders |
+| Level 2 (Focus) | 0 0 0 2px `var(--color-blue-500)` | Focus ring for inputs and interactive elements |
+| Level 3 (Overlay) | Backdrop blur + semi-transparent dark | Navigation overlay, modal backgrounds |
+
+### Depth Philosophy
+Sanity's depth system is almost entirely **colorimetric** rather than shadow-based. Elevation is communicated through surface color shifts: `#0b0b0b` (ground) -> `#212121` (elevated) -> `#353535` (prominent) -> `#ffffff` (inverted/highest). This approach is native to dark interfaces where traditional drop shadows would be invisible. The few shadows that exist are ring-based (0px 0px 0px Npx) or blur-based (backdrop-filter) rather than offset shadows, maintaining the flat, precision-engineered aesthetic.
+
+Border-based containment (1px solid `#212121` or `#353535`) serves as the primary spatial separator, with the border darkness calibrated to be visible but not dominant. The system avoids "floating card" aesthetics -- everything feels mounted to the surface rather than hovering above it.
+
+## 7. Do's and Don'ts
+
+### Do
+- Use the achromatic gray scale as the foundation -- maintain pure neutral discipline with no warm/cool tinting
+- Apply Electric Blue (`#0052ef`) consistently as the universal hover/active state across all interactive elements
+- Use extreme negative letter-spacing (-2px to -4.48px) on display headings 48px and above
+- Keep primary CTAs as full-pill shapes (99999px radius) with the coral-red (`#f36458`)
+- Use IBM Plex Mono uppercase for technical labels, tags, and system metadata
+- Communicate depth through surface color (dark-to-light) rather than shadows
+- Maintain generous vertical section spacing (64-120px) on the dark canvas
+- Use `"cv01", "cv11", "cv12", "cv13", "ss07"` OpenType features for display typography
+
+### Don't
+- Don't introduce warm or cool color tints to the neutral scale -- Sanity's grays are pure achromatic
+- Don't use drop shadows for elevation -- dark interfaces demand colorimetric depth
+- Don't apply border-radius between 13px and 99998px -- the system jumps from 12px (large card) directly to pill (99999px)
+- Don't mix the coral-red CTA with the electric blue interactive color in the same element
+- Don't use heavy font weights (700+) -- the system maxes out at 600 and only for 11px uppercase labels
+- Don't place light text on light surfaces or dark text on dark surfaces without checking the gray-on-gray contrast ratio
+- Don't use traditional offset box-shadows -- ring shadows (0 0 0 Npx) or border-based containment only
+- Don't break the tight line-height on headings -- 1.00-1.24 is the range, never go to 1.5+ for display text
+
+## 8. Responsive Behavior
+
+### Breakpoints
+
+| Name | Width | Behavior |
+|------|-------|----------|
+| Desktop XL | >= 1640px | Full layout, maximum content width |
+| Desktop | >= 1440px | Standard desktop layout |
+| Desktop Compact | >= 1200px | Slightly condensed desktop |
+| Laptop | >= 1100px | Reduced column widths |
+| Tablet Landscape | >= 960px | 2-column layouts begin collapsing |
+| Tablet | >= 768px | Transition zone, some elements stack |
+| Mobile Large | >= 720px | Near-tablet layout |
+| Mobile | >= 480px | Single-column, stacked layout |
+| Mobile Small | >= 376px | Minimum supported width |
+
+### Collapsing Strategy
+- **Navigation**: Horizontal links collapse to hamburger menu below 768px
+- **Hero typography**: Scales from 112px -> 72px -> 48px -> 38px across breakpoints, maintaining tight letter-spacing ratios
+- **Grid layouts**: 3-column -> 2-column at ~960px, single-column below 768px
+- **Card grids**: Horizontal scrolling on mobile instead of wrapping (preserving card aspect ratios)
+- **Section spacing**: Vertical padding reduces by ~40% on mobile (120px -> 64px -> 48px)
+- **Button sizing**: CTA pills maintain padding but reduce font size; ghost buttons stay fixed
+- **Code blocks**: Horizontal scroll with preserved monospace formatting
+
+### Mobile-Specific Adjustments
+- Full-bleed sections extend edge-to-edge with 16px internal gutters
+- Touch targets: minimum 44px for all interactive elements
+- Heading letter-spacing relaxes slightly at mobile sizes (less aggressive negative tracking)
+- Image containers switch from fixed aspect ratios to full-width with auto height
+
+## 9. Agent Prompt Guide
+
+### Quick Color Reference
+```
+Background:      #0b0b0b (near-black canvas)
+Surface:         #212121 (elevated cards/containers)
+Border:          #353535 (visible) / #212121 (subtle)
+Text Primary:    #ffffff (white on dark)
+Text Secondary:  #b9b9b9 (silver on dark)
+Text Tertiary:   #797979 (medium gray)
+CTA:             #f36458 (coral-red)
+Interactive:     #0052ef (electric blue, all hovers)
+Success:         #19d600 (green, sRGB fallback)
+Error:           #dd0000 (pure red)
+Light Surface:   #ededed / #ffffff (inverted sections)
+```
+
+### Example Prompts
+
+**Landing page section:**
+"Create a feature section with a near-black (#0b0b0b) background. Use a 48px heading in Inter with -1.68px letter-spacing, white text. Below it, 16px body text in #b9b9b9 with 1.50 line-height. Include a coral-red (#f36458) pill button with white text and a secondary dark (#0b0b0b) pill button with #b9b9b9 text. Both buttons hover to #0052ef blue."
+
+**Card grid:**
+"Build a 3-column card grid on a #0b0b0b background. Each card has a #212121 surface, 1px solid #353535 border, 6px border-radius, and 24px padding. Card titles are 24px white with -0.24px letter-spacing. Body text is 13px #b9b9b9. Add a 13px IBM Plex Mono uppercase tag in #797979 at the top of each card."
+
+**Form section:**
+"Design a contact form on a #0b0b0b background. Inputs have #0b0b0b background, 1px solid #212121 border, 3px border-radius, 8px 12px padding, and #b9b9b9 placeholder text. Focus state shows a 2px blue (#0052ef) ring. Submit button is a full-width coral-red (#f36458) pill. Include a 13px #797979 helper text below each field."
+
+**Navigation bar:**
+"Create a sticky top navigation on #0b0b0b with backdrop blur. Left: brand text in 15px white. Center/right: nav links in 16px #b9b9b9 that hover to blue. Far right: a coral-red (#f36458) pill CTA button. Bottom border: 1px solid #212121."
+
+### Iteration Guide
+1. **Start dark**: Begin with `#0b0b0b` background, `#ffffff` primary text, `#b9b9b9` secondary text
+2. **Add structure**: Use `#212121` surfaces and `#353535` borders for containment -- no shadows
+3. **Apply typography**: Inter (or Space Grotesk) with tight letter-spacing on headings, 1.50 line-height on body
+4. **Color punctuation**: Add `#f36458` for CTAs and `#0052ef` for all hover/interactive states
+5. **Refine spacing**: 8px base unit, 24-32px within sections, 64-120px between sections
+6. **Technical details**: Add IBM Plex Mono uppercase labels for tags and metadata
+7. **Polish**: Ensure all interactive elements hover to `#0052ef`, all buttons are pills or subtle 5px radius, borders are hairline (1px)