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+# Design System Inspired by OpenAI
+
+> Category: AI & LLM
+> Calm, near-monochrome system anchored in deep teal-black with generous white space and editorial typography.
+
+## 1. Visual Theme & Atmosphere
+
+OpenAI's product surface reads like a research lab dressed for the public — clinical, restrained, deliberately quiet. The page background is a true white (`#ffffff`) layered against a near-black ink (`#0d0d0d`) with a subtle teal undertone, so even the text feels slightly cooled rather than aggressively dark. The result is a chromatic neutrality that puts model output, code, and prose front and center, not the chrome around them.
+
+The signature move is the use of **Söhne** (or its system stand-in `inter`) at restrained weights — 400 for body, 500 for nav and labels, 600 for emphasis — paired with **Signifier**, a contemporary serif used for editorial display. Where most AI brands lean futuristic, OpenAI's serif headlines give the product a quietly literary tone, as if every announcement is an essay.
+
+The shape system is uniformly soft: 8px–12px radii, 9999px pills for tags and chips, no harsh corners anywhere. Section transitions are denoted by whitespace rather than dividers; when borders appear they are `#e5e5e5` hairlines that read as the absence of color rather than its presence.
+
+**Key Characteristics:**
+- True white canvas (`#ffffff`) with deep teal-black ink (`#0d0d0d`)
+- Söhne / Inter at modest weights (400, 500, 600) — restraint over assertion
+- Signifier serif for editorial display headlines
+- Soft 8–12px radii everywhere; 9999px pills for chips
+- Hairline borders (`#e5e5e5`) used sparingly; whitespace as primary divider
+- Single-color illustrations in deep teal — no gradients in marks
+- Generous line-height (1.55–1.65) and tracking near zero
+
+## 2. Color Palette & Roles
+
+### Primary
+- **Pure White** (`#ffffff`): Primary background, card surface, button background.
+- **Ink Black** (`#0d0d0d`): Primary text, brand mark, primary CTA.
+- **Soft Black** (`#1a1a1a`): Secondary heading, alternative ink for non-critical text.
+
+### Surface & Background
+- **Mist** (`#fafafa`): Section break background, footer surface.
+- **Pearl** (`#f5f5f5`): Card surface, elevated panel.
+- **Cloud** (`#ececec`): Disabled background, divider tint.
+
+### Brand Accent
+- **OpenAI Teal** (`#10a37f`): Brand primary, link, highlight badge — the lone color in an otherwise neutral system.
+- **Teal Deep** (`#0a7a5e`): Hover and pressed state for the brand color.
+- **Teal Soft** (`#e8f5f0`): Surface tint for success badges, highlight callouts.
+
+### Neutrals & Text
+- **Graphite** (`#3c3c3c`): Body text, default reading color.
+- **Slate** (`#6e6e6e`): Secondary text, captions, metadata.
+- **Ash** (`#9b9b9b`): Tertiary text, placeholder, disabled label.
+- **Stone** (`#c4c4c4`): Decorative dividers, faint icons.
+
+### Semantic & Border
+- **Border Hairline** (`#e5e5e5`): Standard hairline separator.
+- **Border Soft** (`#ededed`): Card outline on white surface.
+- **Error** (`#ef4146`): Validation, destructive action.
+- **Warning** (`#f5a623`): Soft amber for advisory states.
+- **Info** (`#2563eb`): Informational link tone (used sparingly; teal still wins).
+
+## 3. Typography Rules
+
+### Font Family
+- **Display / Editorial**: `Signifier`, with fallback: `'Source Serif Pro', Georgia, serif`
+- **Body / UI**: `Söhne`, with fallback: `Inter, system-ui, -apple-system, 'Segoe UI', sans-serif`
+- **Code / Mono**: `Söhne Mono`, with fallback: `ui-monospace, 'JetBrains Mono', Menlo, Consolas, monospace`
+
+### Hierarchy
+
+| Role | Font | Size | Weight | Line Height | Letter Spacing | Notes |
+|------|------|------|--------|-------------|----------------|-------|
+| Display | Signifier | 56px (3.5rem) | 400 | 1.08 | -0.02em | Editorial hero, announcement titles |
+| H1 | Söhne | 40px (2.5rem) | 600 | 1.15 | -0.01em | Page heading |
+| H2 | Söhne | 28px (1.75rem) | 600 | 1.2 | -0.005em | Section heading |
+| H3 | Söhne | 20px (1.25rem) | 600 | 1.3 | normal | Sub-section |
+| Body Large | Söhne | 18px (1.125rem) | 400 | 1.6 | normal | Lede paragraphs |
+| Body | Söhne | 16px (1rem) | 400 | 1.65 | normal | Standard reading text |
+| Body Small | Söhne | 14px (0.875rem) | 400 | 1.55 | normal | Card body, dense UI |
+| Caption | Söhne | 13px (0.8125rem) | 500 | 1.4 | 0.01em | Metadata, badges |
+| Label | Söhne | 12px (0.75rem) | 500 | 1.3 | 0.04em | Eyebrow, uppercase nav links |
+| Code | Söhne Mono | 14px (0.875rem) | 400 | 1.55 | normal | Code blocks, terminal output |
+
+### Principles
+- **Restraint as identity**: weights cap at 600; 700+ feels off-brand. Hierarchy comes from size and color, not weight.
+- **Serif for soul, sans for system**: Signifier appears only in editorial display moments. The product UI is sans-only.
+- **Negative tracking on display**: -0.02em on display sizes; tracking returns to zero by 16px.
+
+## 4. Component Stylings
+
+### Buttons
+
+**Primary**
+- Background: `#0d0d0d`
+- Text: `#ffffff`
+- Padding: 10px 18px
+- Radius: 9999px (full pill) on chips, 12px on rectangular CTAs
+- Hover: `#1a1a1a` background
+- Use: Primary CTA, "Try ChatGPT", "Sign in"
+
+**Secondary**
+- Background: `#ffffff`
+- Text: `#0d0d0d`
+- Border: 1px solid `#e5e5e5`
+- Padding: 10px 18px
+- Radius: 12px
+- Hover: background `#fafafa`, border `#d4d4d4`
+
+**Brand Accent**
+- Background: `#10a37f`
+- Text: `#ffffff`
+- Padding: 10px 18px
+- Radius: 12px
+- Hover: `#0a7a5e`
+- Use: Highlighted upgrade CTA, success path
+
+### Cards
+- Background: `#ffffff`
+- Border: 1px solid `#ededed`
+- Radius: 16px
+- Padding: 24px–32px
+- Shadow: none by default; on hover `0 4px 16px rgba(13,13,13,0.06)`
+
+### Inputs
+- Background: `#ffffff`
+- Border: 1px solid `#e5e5e5`
+- Radius: 12px
+- Padding: 12px 14px
+- Focus: border `#10a37f`, ring `0 0 0 3px rgba(16,163,127,0.12)`
+
+### Pills & Tags
+- Background: `#f5f5f5`
+- Text: `#3c3c3c`
+- Padding: 4px 10px
+- Radius: 9999px
+- Font: 12px / 500
+
+## 5. Spacing & Layout
+
+- **Base unit**: 4px. Scale: 4, 8, 12, 16, 24, 32, 48, 64, 96, 128.
+- **Container**: max-width 1200px, 24px gutter on mobile, 48px on desktop.
+- **Section rhythm**: 96–128px vertical between major sections; 64px on mobile.
+- **Grid**: 12-column desktop, 4-column mobile, 24px gap.
+
+## 6. Motion
+
+- **Duration**: 150–220ms for hover; 280–360ms for layout transitions.
+- **Easing**: `cubic-bezier(0.16, 1, 0.3, 1)` (smooth out) for entrances.
+- **Restraint**: no parallax, no scroll-jacking. Subtle fade and translate only.