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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

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)

Semantic Usage

• Use Ocean for primary actions, main navigation, success states
• Use Sky Blue for interactive elements, information, secondary actions
• Use Flamingo sparingly for CTAs, warnings, important highlights
• Use Deep Ocean for text, borders, authoritative elements
• Use Cloud for backgrounds, subtle dividers, inactive states

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 states, darken by 10-15% or lighten by 10-15% staying within brand

Mermaid Styles

Example Mermaid class definitions to apply Mantel brand styles to diagrams

Mermaid Theme Class Definitions

Primary elements (Ocean with Cloud fill for readability)

classDef process fill:#EEF9FD,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef components fill:#EEF9FD,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef subprocess fill:#EEF9FD,stroke:#1E5E82,stroke-width:1px,color:#002A41,stroke-dasharray:5 5

Interactive/Input elements (Sky Blue)

classDef inputOutput fill:#81CCEA,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef api fill:#81CCEA,stroke:#002A41,stroke-width:2px,color:#002A41
classDef user fill:#81CCEA,stroke:#002A41,stroke-width:2px,color:#002A41
classDef external fill:#81CCEA,stroke:#002A41,stroke-width:2px,color:#002A41,stroke-dasharray:3 3

Decision points and important elements (Flamingo)

classDef decision fill:#D86E89,stroke:#002A41,stroke-width:2px,color:#FFFFFF
classDef critical fill:#D86E89,stroke:#002A41,stroke-width:2px,color:#FFFFFF
classDef error fill:#D86E89,stroke:#002A41,stroke-width:3px,color:#FFFFFF
classDef warning fill:#D86E8955,stroke:#D86E89,stroke-width:2px,color:#002A41
classDef security fill:#D86E89,stroke:#002A41,stroke-width:3px,color:#FFFFFF,stroke-dasharray:2 1

Data and storage (Deep Ocean)

classDef data fill:#002A41,stroke:#1E5E82,stroke-width:2px,color:#EEF9FD
classDef storage fill:#002A41,stroke:#1E5E82,stroke-width:2px,color:#EEF9FD
classDef database fill:#002A41,stroke:#1E5E82,stroke-width:2px,color:#EEF9FD
classDef cache fill:#002A4166,stroke:#1E5E82,stroke-width:2px,color:#002A41

State classes

classDef start fill:#1E5E82,stroke:#002A41,stroke-width:3px,color:#EEF9FD
classDef end fill:#002A41,stroke:#1E5E82,stroke-width:3px,color:#EEF9FD
classDef success fill:#1E5E8233,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef pending fill:#81CCEA55,stroke:#81CCEA,stroke-width:2px,color:#002A41,stroke-dasharray:5 5
classDef active fill:#1E5E82,stroke:#002A41,stroke-width:2px,color:#EEF9FD
classDef complete fill:#1E5E8255,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef disabled fill:#EEF9FD,stroke:#81CCEA66,stroke-width:1px,color:#81CCEA
classDef inactive fill:#EEF9FD,stroke:#81CCEA66,stroke-width:1px,color:#81CCEA

Process types

classDef manual fill:#EEF9FD,stroke:#D86E89,stroke-width:2px,color:#002A41
classDef automated fill:#EEF9FD,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef async fill:#81CCEA33,stroke:#81CCEA,stroke-width:2px,color:#002A41,stroke-dasharray:8 3
classDef sync fill:#EEF9FD,stroke:#1E5E82,stroke-width:2px,color:#002A41

System elements

classDef system fill:#002A4133,stroke:#002A41,stroke-width:2px,color:#002A41
classDef network fill:#81CCEA33,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef queue fill:#81CCEA55,stroke:#1E5E82,stroke-width:2px,color:#002A41
classDef monitoring fill:#EEF9FD,stroke:#81CCEA,stroke-width:2px,color:#002A41,stroke-dasharray:1 1

Emphasis and highlights

classDef highlight fill:#D86E8922,stroke:#D86E89,stroke-width:3px,color:#002A41
classDef focus fill:#1E5E8244,stroke:#1E5E82,stroke-width:3px,color:#002A41
classDef selected fill:#81CCEA44,stroke:#002A41,stroke-width:3px,color:#002A41

Secondary elements

classDef secondary fill:#EEF9FD,stroke:#81CCEA,stroke-width:2px,color:#002A41
classDef note fill:#EEF9FD,stroke:#81CCEA,stroke-width:1px,color:#1E5E82
classDef comment fill:#EEF9FD,stroke:#81CCEA,stroke-width:1px,color:#1E5E82,stroke-dasharray:3 3
classDef optional fill:#EEF9FD,stroke:#81CCEA,stroke-width:1px,color:#002A41,stroke-dasharray:5 5

Default styling

classDef default fill:#EEF9FD,stroke:#1E5E82,stroke-width:2px,color:#002A41

Mermaid Usage Guide

Core Process Elements:

• Use 'process' for standard workflow steps
• Use 'subprocess' for nested or child processes
• Use 'components' for system components or modules

Interactive Elements:

• Use 'inputOutput' for user interactions or system I/O
• Use 'user' for user/actor specific elements
• Use 'api' for external service connections
• Use 'external' for third-party systems or external dependencies

Decision and Alert Elements:

• Use 'decision' for branching logic or critical choices
• Use 'critical' for important warnings or highlights
• Use 'error' for error states or failure conditions
• Use 'warning' for caution states (less severe than errors)
• Use 'security' for security-related checkpoints or processes

Data Elements:

• Use 'data' for data objects or data flow
• Use 'storage' or 'database' for persistent storage
• Use 'cache' for temporary storage or caching layers

State Elements:

• Use 'start' for process start points
• Use 'end' for process end points
• Use 'success' for successful completion states
• Use 'pending' for waiting or queued states
• Use 'active' for currently running processes
• Use 'complete' for finished processes
• Use 'disabled' or 'inactive' for unavailable elements

Process Types:

• Use 'manual' for human/manual processes
• Use 'automated' for automatic processes
• Use 'async' for asynchronous operations
• Use 'sync' for synchronous operations

System Elements:

• Use 'system' for internal system components
• Use 'network' for network-related elements
• Use 'queue' for message queues or buffers
• Use 'monitoring' for logging or monitoring components

Emphasis Elements:

• Use 'highlight' for temporarily emphasised elements
• Use 'focus' for elements requiring attention
• Use 'selected' for user-selected items

Supporting Elements:

• Use 'secondary' for supporting or auxiliary elements
• Use 'note' for annotations or explanatory text
• Use 'comment' for inline comments or documentation
• Use 'optional' for optional steps or components

Transparency Note

Some classes use transparency via hex alpha values (e.g., #81CCEA55):

• Last 2 digits represent opacity: FF=100%, CC=80%, 99=60%, 66=40%, 55=33%, 33=20%, 22=13%
• Used for: warning, cache, pending, disabled, system, network, queue, highlight states
• This creates visual hierarchy without introducing non-brand colours

Mermaid Rules

• Use <br> instead of \n for line breaks
• Apply standard colour theme unless specified otherwise
• Do NOT use round brackets ( ) within item labels or descriptions
• Mermaid does not support unordered lists within item labels

PlantUML Styles

PlantUML Colour Definitions

Apply these at the start of PlantUML diagrams:

!define OCEAN #1E5E82
!define FLAMINGO #D86E89
!define DEEP_OCEAN #002A41
!define SKY_BLUE #81CCEA
!define CLOUD #EEF9FD

skinparam backgroundColor CLOUD
skinparam defaultFontColor DEEP_OCEAN

' Activity Diagrams
skinparam activity {
   BackgroundColor CLOUD
   BorderColor OCEAN
   FontColor DEEP_OCEAN
   StartColor OCEAN
   EndColor DEEP_OCEAN
   BarColor FLAMINGO
   DiamondBackgroundColor SKY_BLUE
   DiamondBorderColor OCEAN
}

' Class Diagrams
skinparam class {
   BackgroundColor CLOUD
   BorderColor OCEAN
   FontColor DEEP_OCEAN
   AttributeFontColor OCEAN
   StereotypeFontColor SKY_BLUE
   ArrowColor OCEAN
   HeaderBackgroundColor SKY_BLUE
}

' Sequence Diagrams
skinparam sequence {
   ParticipantBackgroundColor SKY_BLUE
   ParticipantBorderColor OCEAN
   ActorBackgroundColor CLOUD
   ActorBorderColor DEEP_OCEAN
   LifeLineBorderColor OCEAN
   ArrowColor OCEAN
   GroupBackgroundColor CLOUD
   GroupBorderColor SKY_BLUE
   NoteBackgroundColor CLOUD
   NoteBorderColor FLAMINGO
}

' Component Diagrams
skinparam component {
   BackgroundColor CLOUD
   BorderColor OCEAN
   FontColor DEEP_OCEAN
   InterfaceBackgroundColor SKY_BLUE
   InterfaceBorderColor DEEP_OCEAN
}

' State Diagrams
skinparam state {
   BackgroundColor CLOUD
   BorderColor OCEAN
   FontColor DEEP_OCEAN
   StartColor OCEAN
   EndColor DEEP_OCEAN
   AttributeFontColor OCEAN
}

' Use Case Diagrams
skinparam usecase {
   BackgroundColor CLOUD
   BorderColor OCEAN
   FontColor DEEP_OCEAN
   ActorBackgroundColor SKY_BLUE
   ActorBorderColor DEEP_OCEAN
}

' Error/Warning States
skinparam note {
   BackgroundColor<<warning>> FLAMINGO
   BorderColor<<warning>> DEEP_OCEAN
   FontColor<<warning>> CLOUD
}

Frontend Component Styles

CSS Variables

:root {
   /* Primary Colours */
   --brand-ocean: #1E5E82;
   --brand-flamingo: #D86E89;
   --brand-deep-ocean: #002A41;
   --brand-sky-blue: #81CCEA;
   --brand-cloud: #EEF9FD;

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

   /* State Colours */
   --colour-error: var(--brand-flamingo);
   --colour-warning: var(--brand-flamingo);
   --colour-success: var(--brand-ocean);
   --colour-info: var(--brand-sky-blue);

   /* 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);
}

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 (#D86E89)
• Text: White (#FFFFFF)
• Hover: Darker Flamingo (darken by 10%)
• 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: Flamingo (#D86E89)

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

Error:

• Background: Flamingo (#D86E89) at 10% opacity
• Border: Flamingo (#D86E89)
• Text: Deep Ocean (#002A41)
• Icon: Flamingo (#D86E89)

Warning:

• Background: Flamingo (#D86E89) at 5% opacity
• Border: Flamingo (#D86E89) at 50%
• Text: Deep Ocean (#002A41)
• Icon: Flamingo (#D86E89)

Success:

• Background: Ocean (#1E5E82) at 10% opacity
• Border: Ocean (#1E5E82)
• Text: Deep Ocean (#002A41)
• Icon: Ocean (#1E5E82)

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)

Tailwind Configuration

module.exports = {
   theme: {
      extend: {
         colours: {
            'brand': {
               'ocean': '#1E5E82',
               'flamingo': '#D86E89',
               'deep-ocean': '#002A41',
               'sky-blue': '#81CCEA',
               'cloud': '#EEF9FD',
            }
         }
      }
   }
}

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.

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; }
}

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

Weekly Installs

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Repository

sammcj/agentic-coding

GitHub Stars

113

First Seen

Jan 27, 2026

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