apply-mantel-styles

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Provides guidelines for applying Mantel's brand styles to diagrams and frontend components. Use when asked to create visuals that need to align with Mantel's branding.

sammcj By sammcj schedule Updated 4/21/2026
play_arrow Run Skill in Manus View GitHub

name: apply-mantel-styles description: Provides guidelines for applying Mantel's brand styles to diagrams and frontend components. Use when asked to create visuals that need to align with Mantel's branding.

Rules For Applying Mantel Brand Styles

When creating visual diagrams or frontend components, you can apply the following style guidelines to ensure consistency with the Mantel brand identity.

Colour Scheme

  • You should aim to use the following primary colours from the Mantel brand palette.
  • You may also use tints and shades of these colours as needed, but avoid introducing non-brand colours.

Palette

Name Hex RGB
Ocean #1E5E82 rgb(30, 94, 130)
Flamingo #D86E89 rgb(216, 110, 137)
Deep Ocean #002A41 rgb(0, 42, 65)
Sky Blue #81CCEA rgb(129, 204, 234)
Cloud #EEF9FD rgb(238, 249, 253)

Extended Palette — Brand Ramps (50 lightest → 900 darkest)

Use these tokens for tints, shades, hover states, borders, and surfaces without introducing non-brand colours. Prefer the core step (bold) for each brand colour; reach for neighbouring steps when you need contrast adjustment.

Ocean — core 500

 50  #E8F2F8      500  #1E5E82   ← core
100  #C5DCEA      600  #174E6E
200  #9DC3D8      700  #103D57
300  #6AA5C3      800  #0A2D40
400  #3D89AF      900  #042031

Flamingo — core 500

 50  #FAEEF2      500  #D86E89   ← core
100  #F4D1DA      600  #C25079
200  #EDB0BE      700  #9E3456
300  #E690A2      800  #7A1E3D
400  #DE7F92      900  #550E28

Sky — core 400 (Sky's brand anchor sits at 400, not 500)

 50  #F0FAFD      400  #81CCEA   ← core
100  #D9F1F9      500  #59BAE2
200  #B8E5F5      600  #329DD3
300  #95D6EF      700  #1B7EAD
                  800  #0E5F85
                  900  #064260

Neutral — greys for text, borders, dividers on light surfaces

 50  #F5F7F9      500  #8A99AB
100  #DDE3EA      600  #5C6A7A
200  #C5CED9      700  #3E4F5E
300  #A8B5C4      800  #293C49
400  #B2BECC      900  #161C21

Anchor Tokens (fixed, not on a ramp)

Token Hex Use
Deep Ocean #002A41 Primary dark background
Cloud #EEF9FD Primary light / neutral background
Skywalker 950 #001421 Near-black dark surface
Skywalker 900 #001E2F Deepest dark section
Skywalker 800 #042D44 Dark surface 2
Skywalker 700 #073B58 Dark surface 3
Skywalker 600 #0C4F74 Dark surface 4 (lightest dark)

Semantic Status Colours

Use these for success / warning / error / attention states. Do not substitute brand colours — overloading Flamingo for errors breaks the semantic contract users rely on.

Token Hex Use
Yoda 600 #07883D Success / positive
BB8 600 #E87400 Warning
Kylo 600 #D91544 Error / danger
Pyre 300 #FFD60A Highlight / attention

General Design Principles

Colour Hierarchy

  1. Primary Actions/Elements: Ocean (#1E5E82)
  2. Secondary/Supporting: Sky Blue (#81CCEA)
  3. Emphasis/Accent: Flamingo (#D86E89)
  4. Foundation/Authority: Deep Ocean (#002A41)
  5. Background/Neutral: Cloud (#EEF9FD)
  • Light backgrounds use Cloud (#EEF9FD) or white (#FFFFFF).
  • Dark backgrounds use Deep Ocean (#002A41). Never use pure black (#000000).
  • Primary text on light backgrounds is Deep Ocean. On dark backgrounds, use white.
  • Accent elements (borders, icons, highlights) use Ocean, Flamingo, or Sky Blue.

Semantic Usage

  • Use Ocean for primary actions, main navigation, and brand-level emphasis
  • Use Sky Blue for interactive elements, information, and secondary actions
  • Use Flamingo sparingly for CTAs and brand highlights (not for errors — use Kylo)
  • Use Deep Ocean for text, borders, authoritative elements
  • Use Cloud for backgrounds, subtle dividers, inactive states
  • Use the semantic status colours (Yoda / BB8 / Kylo / Pyre) for success / warning / error / attention — never substitute brand colours for these
  • Default to light / day mode colour schemes

Consistency Rules

  • Avoid mixing colour schemes from other brands
  • Maintain consistent colour meanings across all diagrams in a project
  • When transparency is needed, use rgba values of the brand colours
  • For hover/pressed states, step one rung on the brand ramp (e.g. ocean-500 → ocean-600 on hover, flamingo-500 → flamingo-600 on press). Only fall back to percentage darken/lighten if no ramp token fits

Frontend Component Styles

Component Guidelines

Buttons

Primary:

  • Background: Ocean (#1E5E82)
  • Text: Cloud (#EEF9FD)
  • Hover: Deep Ocean (#002A41)
  • Border: none or Ocean

Secondary:

  • Background: Sky Blue (#81CCEA)
  • Text: Deep Ocean (#002A41)
  • Hover: Ocean (#1E5E82) with Cloud text
  • Border: Ocean (#1E5E82)

Accent/CTA:

  • Background: Flamingo 500 (#D86E89)
  • Text: White (#FFFFFF)
  • Hover: Flamingo 600 (#C25079)
  • Border: none

Ghost/Outline:

  • Background: transparent
  • Text: Ocean (#1E5E82)
  • Hover: Cloud (#EEF9FD) background
  • Border: Ocean (#1E5E82)

Navigation

Header:

  • Background: Deep Ocean (#002A41)
  • Text: Cloud (#EEF9FD)
  • Active: Sky Blue (#81CCEA)
  • Hover: Ocean (#1E5E82) background

Sidebar:

  • Background: Cloud (#EEF9FD)
  • Text: Deep Ocean (#002A41)
  • Active: Ocean (#1E5E82) with Cloud text
  • Hover: Sky Blue (#81CCEA) background

Forms

Input Fields:

  • Background: White (#FFFFFF)
  • Border: Sky Blue (#81CCEA)
  • Focus Border: Ocean (#1E5E82)
  • Text: Deep Ocean (#002A41)
  • Placeholder: Sky Blue (#81CCEA)
  • Error Border: Kylo 600 (#D91544)

Labels:

  • Colour: Ocean (#1E5E82)
  • Required Indicator: Flamingo (#D86E89)

Cards and Surfaces

Standard Card:

  • Background: White (#FFFFFF)
  • Border: Cloud (#EEF9FD)
  • Shadow: rgba(0, 42, 65, 0.1)

Highlighted Card:

  • Background: Cloud (#EEF9FD)
  • Border: Sky Blue (#81CCEA)
  • Shadow: rgba(30, 94, 130, 0.15)

Alerts and Messages

Use the semantic status colours — do not overload Flamingo for errors/warnings or Ocean for success.

Error:

  • Background: Kylo 600 (#D91544) at 10% opacity
  • Border: Kylo 600 (#D91544)
  • Text: Deep Ocean (#002A41)
  • Icon: Kylo 600 (#D91544)

Warning:

  • Background: BB8 600 (#E87400) at 10% opacity
  • Border: BB8 600 (#E87400)
  • Text: Deep Ocean (#002A41)
  • Icon: BB8 600 (#E87400)

Success:

  • Background: Yoda 600 (#07883D) at 10% opacity
  • Border: Yoda 600 (#07883D)
  • Text: Deep Ocean (#002A41)
  • Icon: Yoda 600 (#07883D)

Info:

  • Background: Sky Blue (#81CCEA) at 10% opacity
  • Border: Sky Blue (#81CCEA)
  • Text: Deep Ocean (#002A41)
  • Icon: Sky Blue (#81CCEA)

Data Visualisation (Charts)

  • Primary Series: Ocean (#1E5E82)
  • Secondary Series: Sky Blue (#81CCEA)
  • Tertiary Series: Deep Ocean (#002A41)
  • Highlight/Accent: Flamingo (#D86E89)
  • Background: Cloud (#EEF9FD)
  • Grid Lines: Sky Blue (#81CCEA) at 20% opacity
  • Text: Deep Ocean (#002A41)

CSS Variables

:root {
   /* Core brand (anchor steps) */
   --brand-ocean: #1E5E82;        /* ocean-500 */
   --brand-flamingo: #D86E89;     /* flamingo-500 */
   --brand-sky-blue: #81CCEA;     /* sky-400 */
   --brand-deep-ocean: #002A41;
   --brand-cloud: #EEF9FD;

   /* Ocean ramp */
   --ocean-50:  #E8F2F8; --ocean-100: #C5DCEA; --ocean-200: #9DC3D8;
   --ocean-300: #6AA5C3; --ocean-400: #3D89AF; --ocean-500: #1E5E82;
   --ocean-600: #174E6E; --ocean-700: #103D57; --ocean-800: #0A2D40;
   --ocean-900: #042031;

   /* Flamingo ramp */
   --flamingo-50:  #FAEEF2; --flamingo-100: #F4D1DA; --flamingo-200: #EDB0BE;
   --flamingo-300: #E690A2; --flamingo-400: #DE7F92; --flamingo-500: #D86E89;
   --flamingo-600: #C25079; --flamingo-700: #9E3456; --flamingo-800: #7A1E3D;
   --flamingo-900: #550E28;

   /* Sky ramp */
   --sky-50:  #F0FAFD; --sky-100: #D9F1F9; --sky-200: #B8E5F5;
   --sky-300: #95D6EF; --sky-400: #81CCEA; --sky-500: #59BAE2;
   --sky-600: #329DD3; --sky-700: #1B7EAD; --sky-800: #0E5F85;
   --sky-900: #064260;

   /* Neutral greys */
   --neutral-50:  #F5F7F9; --neutral-100: #DDE3EA; --neutral-200: #C5CED9;
   --neutral-300: #A8B5C4; --neutral-400: #B2BECC; --neutral-500: #8A99AB;
   --neutral-600: #5C6A7A; --neutral-700: #3E4F5E; --neutral-800: #293C49;
   --neutral-900: #161C21;

   /* Dark surfaces */
   --skywalker-950: #001421; --skywalker-900: #001E2F; --skywalker-800: #042D44;
   --skywalker-700: #073B58; --skywalker-600: #0C4F74;

   /* Semantic status */
   --yoda-600: #07883D;  /* success */
   --bb8-600:  #E87400;  /* warning */
   --kylo-600: #D91544;  /* error */
   --pyre-300: #FFD60A;  /* highlight */

   /* Semantic mappings */
   --colour-primary: var(--brand-ocean);
   --colour-primary-dark: var(--brand-deep-ocean);
   --colour-secondary: var(--brand-sky-blue);
   --colour-accent: var(--brand-flamingo);
   --colour-background: var(--brand-cloud);
   --colour-surface: #FFFFFF;

   /* Text */
   --text-primary: var(--brand-deep-ocean);
   --text-secondary: var(--brand-ocean);
   --text-on-primary: var(--brand-cloud);
   --text-on-accent: #FFFFFF;

   /* State (semantic status — do not substitute brand colours) */
   --colour-error: var(--kylo-600);
   --colour-warning: var(--bb8-600);
   --colour-success: var(--yoda-600);
   --colour-info: var(--brand-sky-blue);
   --colour-highlight: var(--pyre-300);

   /* Shadows and overlays */
   --shadow-colour: rgba(0, 42, 65, 0.1);
   --overlay-light: rgba(238, 249, 253, 0.9);
   --overlay-dark: rgba(0, 42, 65, 0.8);
}

Tailwind Configuration

Tailwind's config key is colors (American spelling) — this is required by the framework regardless of project-wide spelling conventions.

module.exports = {
   theme: {
      extend: {
         colors: {
            brand: {
               ocean: '#1E5E82',
               flamingo: '#D86E89',
               'sky-blue': '#81CCEA',
               'deep-ocean': '#002A41',
               cloud: '#EEF9FD',
            },
            ocean: {
               50: '#E8F2F8', 100: '#C5DCEA', 200: '#9DC3D8',
               300: '#6AA5C3', 400: '#3D89AF', 500: '#1E5E82',
               600: '#174E6E', 700: '#103D57', 800: '#0A2D40',
               900: '#042031',
            },
            flamingo: {
               50: '#FAEEF2', 100: '#F4D1DA', 200: '#EDB0BE',
               300: '#E690A2', 400: '#DE7F92', 500: '#D86E89',
               600: '#C25079', 700: '#9E3456', 800: '#7A1E3D',
               900: '#550E28',
            },
            sky: {
               50: '#F0FAFD', 100: '#D9F1F9', 200: '#B8E5F5',
               300: '#95D6EF', 400: '#81CCEA', 500: '#59BAE2',
               600: '#329DD3', 700: '#1B7EAD', 800: '#0E5F85',
               900: '#064260',
            },
            neutral: {
               50: '#F5F7F9', 100: '#DDE3EA', 200: '#C5CED9',
               300: '#A8B5C4', 400: '#B2BECC', 500: '#8A99AB',
               600: '#5C6A7A', 700: '#3E4F5E', 800: '#293C49',
               900: '#161C21',
            },
            skywalker: {
               600: '#0C4F74', 700: '#073B58', 800: '#042D44',
               900: '#001E2F', 950: '#001421',
            },
            // Semantic status (single-step anchors)
            yoda: '#07883D',   // success
            bb8:  '#E87400',   // warning
            kylo: '#D91544',   // error
            pyre: '#FFD60A',   // highlight
         }
      }
   }
}

Fonts & Typography

  • Where applicable, the 'Inter' typeface is used for headlines, subheadings, and body copy.
  • Favour bundling the font for offline use over relying on CDNs.
Role Font Weight CSS
Headlines Inter SemiBold font-weight: 600
Subheadings Inter Medium font-weight: 500
Body copy Inter Regular font-weight: 400

Inter CDN Fallback

If bundling is not possible, use this CDN:

<!-- HTML in your document's head -->
<link rel="preconnect" href="https://rsms.me/">
<link rel="stylesheet" href="https://rsms.me/inter/inter.css">

:root {
  font-family: Inter, sans-serif;
  font-feature-settings: 'liga' 1, 'calt' 1; /* fix for Chrome */
}
@supports (font-variation-settings: normal) {
  :root { font-family: InterVariable, sans-serif; }
}

Logo System

Logo Variants

The skill bundles all logo files in assets/. Selection guide:

File Use when…
Mantel_Logo__Positive.svg Full-colour logo on light backgrounds
Mantel_Logo__Negative.svg Full-colour logo on dark backgrounds
Mantel_Logo__Navy.svg Mono (Deep Ocean) logo on light backgrounds
Mantel_Logo__White.svg Mono (white) logo on dark backgrounds
Mantel_Icon__Positive.svg Full-colour icon only, on light backgrounds
Mantel_Icon__Negative.svg Full-colour icon only, on dark backgrounds
Mantel_Icon__Navy.svg Mono (Deep Ocean) icon, on light backgrounds
Mantel_Icon__White.svg Mono (white) icon, on dark backgrounds

Logo Rules (critical — violations are immediately visible)

  1. Never stretch or distort. Logo aspect ratio is approximately 4.67:1. Icon is approximately 1.5:1. Always preserve proportions.
  2. Never change logo colours. Use only the provided variants — never recolour the icon or wordmark.
  3. Never crop the logo. All elements must be fully visible.
  4. Minimum clear space around the logo equals the height and width of the icon portion.
  5. Minimum sizes: Logo 80px / 21mm wide. Icon 44px / 12mm wide.
  6. Light logo on light background = wrong. Dark logo on dark background = wrong. Always use the variant that contrasts with the background.
  7. Preferred for client-facing materials: Use the full-colour Negative logo on Deep Ocean backgrounds. This is the most common and branded combination.
  8. Never add a coloured border around the logo — the brand guide explicitly prohibits this.

Resources

If you are creating diagrams you MUST also read in ./resources/diagrams.md

This information should help you maintain visual consistency with the Mantel brand across diagrams and frontend components.

Install via CLI
npx skills add https://github.com/sammcj/agentic-coding --skill apply-mantel-styles
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